JP2010250939A - Data processing method, data processing apparatus, information recording medium, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for determining data arrangement that guarantees seamless reproduction even when a jump in a browsable slide show occurs. <P>SOLUTION: An allowable jump range between an image data clip and an audio data clip required for data reading in the so-called browsable slide show in which consecutive reproduction processing of a still image and audio reproduction processing are performed in parallel is determined so as to determine arrangement conditions of data to be stored in an information recording medium based on the information on the determined allowable jump range. This configuration enables the browsable slide show to be carried out as seamless reproduction processing without any data discontinuity. Furthermore, it is possible to provide a plurality of combinations of readout rates of the audio data and the image data. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a data processing method, a data processing device, an information recording medium, and a computer program. More specifically, in the content reproduction process in which the image data and the audio data recorded at different positions on the disc are reproduced together, the reproduction interruption caused by the jump process occurring in the switching and reading process of each image and audio data is prevented. The present invention relates to a data processing method, a data processing apparatus, an information recording medium, and a computer program that enable seamless content reproduction.

  Recording media such as Blu-ray discs using a blue laser, or DVD (Digital Versatile Disc) discs, such as audio data such as music, image data such as movies, game programs, various application programs, etc. Software data can be stored.

  Data storage formats corresponding to these various data are defined, and each data is stored according to the respective format.

  One of the data playback modes is continuous playback of still images (so-called slide show). Each still image signal is encoded into an MPEG2 (Moving Picture Experts Group 2) video intra-frame encoded image (I-picture) and multiplexed into an MPEG2 transport stream. Also, by multiplexing the I-picture, audio, and sub-picture into the MPEG2 transport stream, the audio and sub-picture can be reproduced in synchronization with the slide show. Such a slide show is played back according to a predetermined timing based on a presentation time stamp (PTS) that is set as attribute information corresponding to data as time information of playback timing.

  In a configuration in which image data and audio data are stored separately on the disc, the image data and audio data from the disc are alternated in order to play back the audio during continuous playback of still images (browsable slideshow). It is necessary to execute processing in accordance with a predetermined sequence, such as reading data, storing each read data in a buffer, and executing data decoding processing and outputting the data.

In reading and playback of content stored on the disc,
Obtaining information from DISS,
Temporary storage (buffer) of acquired information
Decoding buffer data,
The procedure of outputting the data after decryption is executed.

  Decryption of buffer data includes processing such as decryption processing of MPEG data if the content is MPEG data, and decryption processing of encrypted data if the content is encrypted.

  When image data and audio data are individually stored on a disk and the data are located at separate positions, it is necessary to move the reading bed, that is, perform a jump process. When the jump process occurs, the jump process is performed at a position away from the data reproduction position on the disc, and the time from the next reading position to the data reading and the reproduction process is required. When this time becomes long, Playback interruption may occur.

  Therefore, when reading and playing back audio together with the above-described continuous playback (browsable slide show) of still images, the time required for the jump processing in the configuration in which image data and audio data accompanied by jump processing are alternately read. However, there is a problem that the reproduction data is interrupted when the data becomes long.

  The present invention has been made in view of the above-described problems, and defines a recording format for image data and audio data on an information recording medium (disc) and executes a predetermined data recording process and reproduction process. Data processing method, data processing apparatus, and information that enable seamless playback without reducing interruption of playback data by reducing the time required for jump processing at the time of executing a browsable slideshow that plays back audio together It is an object to provide a recording medium and a computer program.

  Furthermore, in the process of determining the recording data configuration of image data and audio data to be applied to the browsable slide show, a plurality of image data and audio data reading rates satisfying the conditions that enable reproduction without causing data interruption are provided. It is an object to provide a data processing method, a data processing apparatus, an information recording medium, and a computer program that can be combined, and that can record and reproduce data having a combination rate freely selected from these combinations. To do.

The first aspect of the present invention is:
Recording data including an image data clip storing image data and an audio data clip storing audio data to be applied to a browsable slide show that performs audio playback without synchronizing with still image playback performed based on a playback command from the user A data processing method for determining an arrangement configuration for an information recording medium,
An area in which the image data clip and the audio data clip are arranged as one piece of physically continuous data, an image data clip to be stored in an information recording medium is recorded, and an area in which the audio data clip is recorded A data arrangement determining step for determining the data arrangement so that the maximum distance from the innermost circumference of the information recording medium is set within a jump allowable range equal to or less than half the full stroke from the innermost circumference to the outermost circumference of the information recording medium. The data processing method is characterized by the above.

Furthermore, in one embodiment of the data processing method of the present invention, the data arrangement determining step calculates a data size S _MAIN of the image data clip and a data size S _SUB of the audio data clip to be applied to the browseable slide show, When the value of the jump allowable range calculated in the jump allowable range determining step is D _MAX , the following conditions (a), (b),
(A) S _MAIN + S _SUB ≦ D _MAX ,
(B) The image data clip and the audio data clip are steps for determining a data arrangement configuration with a setting that satisfies a continuous arrangement in an area of size D _MAX .

  Furthermore, in one embodiment of the data processing method of the present invention, the data processing method further includes a data recording step of executing data recording on the information recording medium according to the data arrangement condition determined in the data arrangement determining step. Features.

Furthermore, the second aspect of the present invention provides
Recording data including an image data clip storing image data and an audio data clip storing audio data to be applied to a browsable slide show that performs audio playback without synchronizing with still image playback performed based on a playback command from the user A data processing device for determining an arrangement configuration for an information recording medium,
An area in which the image data clip and the audio data clip are arranged as one piece of physically continuous data, an image data clip to be stored in an information recording medium is recorded, and an area in which the audio data clip is recorded A data arrangement determining means for determining a data arrangement so as to set a jump distance within a half stroke corresponding to half of a full stroke from the innermost circumference to the outermost circumference of the information recording medium;
The data processing apparatus is characterized by comprising:

Furthermore, in an embodiment of the data processing apparatus of the present invention, the data arrangement determining means calculates a data size S _MAIN of an image data clip and a data size S _SUB of an audio data clip to be applied to a browseable slide show, When the value of the jump allowable range calculated by the jump allowable range determining means is D _MAX , the following conditions (a), (b),
(A) S _MAIN + S _SUB ≦ D _MAX ,
(B) The image data clip and the audio data clip are each configured to determine a data arrangement configuration that satisfies a continuous arrangement within an area of size D _MAX .

  Furthermore, in one embodiment of the data processing apparatus of the present invention, the data processing apparatus further includes data recording means for executing data recording on the information recording medium in accordance with the data arrangement condition determined by the data arrangement determining means. Features.

Furthermore, the third aspect of the present invention provides
An information recording medium,
An audio data clip storing image data clips and audio data is stored as recording data,
The image data clip and audio data clip applied to the browsable slide show that performs audio reproduction processing in conjunction with still image continuous reproduction are arranged as one piece of physically continuous data, and stored in the information recording medium. The maximum distance between the area in which the clip is recorded and the area in which the audio data clip is recorded is within a jump allowable range equal to or less than a half stroke corresponding to 1/2 of the full stroke from the innermost circumference to the outermost circumference of the information recording medium. The information recording medium has a data arrangement configuration stored together with the area.

Furthermore, in an embodiment of the information recording medium of the present invention, the information recording medium has an image data clip data size applied to the browsable slide show as S _MAIN , an audio data clip data size as S _SUB , and a jump allowable range. When the value is D _MAX , the following conditions (a), (b),
(A) S _MAIN + S _SUB ≦ D _MAX ,
(B) The image data clip and the audio data clip have a data arrangement configuration that satisfies a continuous arrangement in an area of size D _MAX .

Furthermore, the fourth aspect of the present invention provides
Recording data including an image data clip storing image data and an audio data clip storing audio data to be applied to a browsable slide show that performs audio playback without synchronizing with still image playback performed based on a playback command from the user A computer program for executing processing for determining an arrangement configuration with respect to an information recording medium,
An area in which the image data clip and the audio data clip are arranged as one piece of physically continuous data, an image data clip to be stored in an information recording medium is recorded, and an area in which the audio data clip is recorded A data arrangement determining step for determining the data arrangement so that the maximum distance from the innermost circumference of the information recording medium is set within a jump allowable range equal to or less than half the full stroke from the innermost circumference to the outermost circumference of the information recording medium. The computer program is characterized by that.

Furthermore, the fifth aspect of the present invention provides
An information recording medium manufacturing method,
An image data clip and an audio data clip storing image data and audio data to be applied to the browsable slide show are set as physically continuous recording positions on the information recording medium as one continuous data, and the image data The maximum distance between the recording area of the clip and the recording area of the audio data clip is set within a jump allowable range equal to or less than a half stroke corresponding to 1/2 of the full stroke from the innermost circumference to the outermost circumference of the information recording medium. A data arrangement determining step for determining the data arrangement;
A recording step for executing processing for recording image data and audio data on an information recording medium or an information recording medium master according to the data arrangement determined in the data arrangement determining step;
An information recording medium manufacturing method characterized by comprising:

Furthermore, the sixth aspect of the present invention provides
A playback device that executes playback processing of an information recording medium,
The information recording medium is an image data clip and an audio data clip storing image data and audio data to be applied to a browsable slide show, each recorded as one continuous data at physically continuous recording positions on the information recording medium, The maximum distance between the recording area of the image data clip and the recording area of the audio data clip is set within a jump allowable range equal to or less than a half stroke corresponding to 1/2 of the full stroke from the innermost circumference to the outermost circumference of the information recording medium. Have a data arrangement
An image data buffer for storing image data to be applied to a browsable slide show read from an information recording medium;
An audio data buffer for storing audio data to be applied to the browsable slide show read from the information recording medium;
Reproduction means for obtaining each data from the image data buffer and the audio data buffer and executing reproduction processing;
A control unit for performing data reading control for starting a jump operation at an audio data recording position separated by a distance equal to or less than the jump allowable range in the information recording medium when image data is held in the image data buffer to the maximum extent;
A data reproducing apparatus characterized by comprising:

  The computer program of the present invention is, for example, a storage medium or communication medium provided in a computer-readable format to a computer system capable of executing various program codes, such as a CD, FD, or MO. It is a computer program that can be provided by a recording medium or a communication medium such as a network. By providing such a program in a computer-readable format, processing corresponding to the program is realized on the computer system.

  Other objects, features, and advantages of the present invention will become apparent from a more detailed description based on embodiments of the present invention described later and the accompanying drawings. In this specification, the system is a logical set configuration of a plurality of devices, and is not limited to one in which the devices of each configuration are in the same casing.

  According to the configuration of the present invention, for example, in a configuration in which image data clips and audio data clips are individually recorded on a disc such as a Blu-ray disc or a DVD disc, continuous playback of still images and audio playback processing are performed together. An arrangement condition of data to be stored in the information recording medium is determined based on the determined jump allowable range information based on the determined jump allowable range between the image data clip and the audio data clip required for reading data in a so-called browsable slide show. Therefore, seamless playback can be performed without any data interruption when executing a browsable slide show that plays back still images and audio in parallel.

  Further, according to the configuration of the present invention, the time required for the jump is calculated based on the determined jump allowable range information, and the image data stored from the information recording medium is stored based on the calculated required jump time. Since the configuration is such that the size of the data buffer and the size of the audio data buffer for storing the audio data are determined, a configuration for seamless playback of the browsable slide show is realized with the minimum necessary small buffer.

  Furthermore, according to the configuration of the present invention, the browsable slide show reproduction process is executed in the determination process of the recording data configuration of the image data and the audio data applied to the browsable slide show that performs the audio reproduction process in conjunction with the continuous reproduction of the still image. Set the total buffer size of the image data and audio data of the playback device as a fixed value, based on the total buffer size of the playback device, the maximum jump time allowed for data playback, and the data read rate data of the playback device Thus, the image data and audio data read rates are determined, so that the image data and audio data read rates can be freely selected from a combination of image data and audio data read rates that can be reproduced without causing data interruption. A device with a read rate with the selected combination. Recording the data, and reproduced, recorded and it is possible to configure to reproduce high-quality data such as 8-channel LPCM data, for example.

  According to the configuration of the present invention, the image data and audio data read rate is determined in the determination processing of the recording data configuration of image data and audio data applied to the browsable slide show that performs audio reproduction processing in conjunction with still image continuous reproduction. Is set as a fixed value [X], and the read rate of image data and audio data is determined based on this setting condition, so that reproduction without causing data interruption is possible. It is possible to record and reproduce data having a readout rate having a combination freely selected from a plurality of combinations of readout rates of image data and audio data satisfying the requirements. For example, high sound quality data such as 8-channel LPCM data Can be recorded and reproduced.

It is a figure explaining the storage format of the content stored in a Blu-ray disc. It is a figure explaining the structure of the BDAV MPEG2 transport stream as an AV stream on a recording medium. It is a figure which shows the detail of a response | compatibility with the play list and audio | voice data clip which perform the browsable slide show which reproduces | regenerates an audio asynchronously. It is a figure which shows the apparatus structure which reads image data and audio | voice data from a recording medium, such as a browsable slide show, and performs a reproduction | regeneration process. FIG. 5 is a diagram for describing a configuration of a main player 335 and an audio player 336 included in the apparatus shown in FIG. It is a figure which shows the concept of the buffer model of the slide show of a browsable mode. It is a graph which shows the example of the bit occupancy of the elementary stream buffer EB (video code buffer) at the time of the slide show of a browserable mode, and the bit occupancy of the audio code buffer B4. It is a schematic diagram which shows the model of the main TS and the audio TS simultaneous reading method in the slide show of the browsable mode. It is a figure explaining the drive specification which prescribed | regulated time from the jump process at the time of a disc reproduction | regeneration, and the reproduction | regeneration completion | finish at a jump start point to the reproduction | regeneration start at a jump destination. It is a figure explaining the necessary conditions for implement | achieving seamless reproduction | regeneration when an interlayer jump generate | occur | produces in the disc which has a some recording layer. It is a figure explaining the detail of the overhead time accompanying the process of the ECC block which generate | occur | produces at the time of a jump process. It is a figure explaining reduction of the amount of buffer data when a jump occurs. It is a figure explaining the example of a some jump model (A1)-(A3) setting which ensures the reproduction | regeneration without a data break with respect to an interlayer jump. It is a figure explaining the method of determining the continuous data arrangement | positioning condition corresponding to the value of a data recording rate with respect to jump time. A data arrangement condition (continuous data arrangement) corresponding to each value of the buffer size (SRB) and the data recording rate (RTS) required in each of the plurality of jump models (A1) to (A3) described with reference to FIG. It is a figure which shows the minimum value of a size. It is a figure which shows the model of the main TS and the audio | voice TS reading method in the slide show of a browsable mode. It is a figure explaining the example of a several jump model (B1)-(B3) setting which ensures the reproduction | regeneration without a data break in a browsable mode slide show. It is a figure which shows the buffer size required in each of several jump model (A1) demonstrated with reference to FIG. 13, FIG. 17, (B1)-(B3). 18 is a diagram illustrating a data arrangement method when a plurality of clips (Clips) are seamlessly connected in each of the jump models (B1) to (B3) described with reference to FIG. It is a figure explaining the structural example of the data processor which produces | generates the recording data with respect to an information recording medium. It is a figure which shows the flowchart explaining the data processing sequence which produces | generates the recording data with respect to an information recording medium. A read-out rate [R _TS1] of the image data, which is a diagram illustrating a processing example of calculating the combination of the readout rate [R _TS2] of the audio data (process example A). A read-out rate [R _TS1] of the image data, which is a diagram for describing a specific example of a rate determination process in the processing example (process example A) for calculating the combination of the read rate of the audio data [R _TS2]. A read-out rate [R _TS1] of the image data, which is a diagram illustrating a processing example of calculating the combination of the read rate of the audio data [R _TS2] (process example B). A read-out rate [R _TS1] of the image data, which is a diagram for describing a specific example of a rate determination process in the processing example of calculating the combination of the read rate of the audio data [R _TS2] (process example B). It is a figure which shows the example of the reading rate setting table which shows the corresponding | compatible data of the combination of audio | voice data reading rate [ _RTS2 ] and image data reading rate [ _RTS1 ], and total buffer size (RB1 + RB2). It is a figure which shows the example of the reading rate setting table which shows the corresponding | compatible data of the combination of audio | voice data reading rate [ _RTS2 ] and image data reading rate [ _RTS1 ], and total buffer size (RB1 + RB2). It is a figure which shows the example of the reading rate setting table which shows the corresponding | compatible data of the combination of audio | voice data reading rate [ _RTS2 ] and image data reading rate [ _RTS1 ], and total buffer size (RB1 + RB2). It is a figure which shows the flowchart explaining the preparation procedure of a reading rate setting table. 10 is a diagram illustrating a processing flowchart for calculating an image data reading rate [R _TS1 ] and an audio data reading rate [R _TS2 ] based on Formula 3. FIG. 10 is a diagram illustrating a processing flowchart for calculating an image data reading rate [R _TS1 ] and an audio data reading rate [R _TS2 ] based on Formula 3. FIG. It is a figure which shows the process flowchart which calculates image data read-out rate [R _TS1 ] and audio | voice data read-out rate [R _TS2 ] based on Numerical formula 4. It is a block diagram explaining the functional structure of the data processor which performs the process which determines the recording data structure of the image data applied to a browsable slide show, and audio | voice data. It is a block diagram explaining the functional structure of the data processor which performs the process which determines the recording data structure of the image data applied to a browsable slide show, and audio | voice data. FIG. 25 is a diagram for describing a configuration example of a data processing device that performs data recording processing on an information recording medium or reproduction processing from the information recording medium.

Details of the data processing method, data processing apparatus, information recording medium, and computer program of the present invention will be described below with reference to the drawings. The description will be made in the order of the following items.
1. Disc storage content 2. Browserable slide show 3. Jump processing and content storage format 4. Content recording / playback processing 5. Configuration that allows flexible setting of readout rate Configuration of playback device

[1. Disc storage contents]
The present invention defines a recording format for image data and audio data on a disc, and executes a predetermined data recording process and a reproducing process, thereby executing a browsable slide show that reproduces still images together with audio. This makes it possible to perform seamless reproduction without shortening the time required for jump processing and causing interruption of reproduction data.

  In the following embodiments, a Blu-ray disc, which is a disc that performs recording and reproduction using a blue laser, is considered as an example of a disc-type information recording medium. A storage format of content stored in a Blu-ray disc will be described with reference to FIG.

  The information recording medium stores an AV stream and audio data of moving image content such as HD (High Definition) movie content which is high-definition moving image data, for example.

As shown in FIG. 1, content stored in accordance with the Blu-ray disc ROM standard format has a hierarchical structure in accordance with the Blu-ray disc ROM standard format. That is,
(A) Disc navigation program 210
(B) Playback section designation file (playlist) 230
(C) Clip (content data file) 250
It is.

  A pair of clip information as one AV stream and its attached information is considered as one object, and is called a clip 250. The AV stream file is called a clip AV stream file, and its attached information is called a clip information file.

  In general, a data file used in a computer or the like is handled as a byte string, but the content of a clip AV stream file is expanded on the time axis, and the playlist 230 mainly includes access points in the clip 250 as time stamps. specify. The playlist 230 indicates the access point of the clip 250 with a time stamp, and the clip information finds the decoding start address information of the stream in the AV stream file based on the time stamp.

  The playlist 230 is a collection of playback section information in the clip 250. One playback section in a certain clip is called a play item, which is represented by a pair of an IN point and an OUT point on the time axis. That is, a play list is a set of play items.

  The top-level navigation program 210 has a function of controlling the playback order of the playlist 230 and interactive playback of the playlist 230, and is written in a programming language (navigation commands, Java, etc.), for example. Details of (A) the disc navigation program 210, (B) the playback section designation file (playlist) 230, and (C) the clip (content data file) 250 will be described below.

  (A) The disc navigation program 210 includes index data that can be specified by the user and a playback program, allows user input via the user interface, and selects a playback program corresponding to the index data specified by the user. Then, reproduction control is performed by designating a reproduction section designation file (playlist) associated with the selected reproduction program.

  (B) The reproduction section designation file (play list) 230 is composed of a plurality of reproduction section designation files (play lists). For each playback section designation file (playlist), one of a plurality of AV stream data files or audio data files included in the clip (content data file) 250 is selected, and a specific data portion of the selected data file is selected. In this configuration, one or more play items are designated as the reproduction start point and the reproduction end point, and by selecting one reproduction segment designation file (playlist), the reproduction segment designation file (playlist) A playback sequence is determined according to the play item, and playback is performed.

  For example, the playlist 231 shown in the figure is a playlist corresponding to execution of a browsable slide show that performs continuous playback of still images and also reads out and plays back audio, and the playlist 231 includes image data clips 251. A play item 232 that specifies a specific data portion of the clip information 252 and a sub play item 233 that specifies a specific data portion of the clip information 256 of the audio data clip 255 to be reproduced together with the still image are configured.

  In the reproduction process in which the playlist 231 is selected, the reproduction target image data is read from the image data clip 251 by the play item 232, and the reproduction target audio data is reproduced from the audio data clip 255 by the sub play item 233. The data is read out and the image and audio data are reproduced in parallel.

  Note that the still image data displayed in the browsable slide show may be still image data generated based on moving image data included in the image data clip 251, or still image data included in the image data clip 251 may be used. You may use as it is.

  (C) A clip (content data file) 250 is a divided content data file, and includes an image data clip 251 storing an image data file, an audio data clip storing an audio data file, and the like.

  The image data clip 251 has an AV (Audio-Visual) stream file 253 and a clip information file 252. The clip information file 252 is a data file that stores attribute information related to an AV (Audio-Visual) stream file 253. The AV (Audio-Visual) stream file 253 is, for example, MPEG-TS (Moving Picture Experts Group-Transport Stream) data, and has a data structure in which information such as image (Video) data and caption data is multiplexed. Also, command information for controlling the playback device during playback may be multiplexed.

  The audio data clip 255 has an audio data file 257 and a clip information file 256. The clip information file 256 is a data file that stores attribute information related to the audio data file 256, and command information for controlling the playback apparatus during playback may be multiplexed.

  For example, when content playback is performed by selecting a playback segment designation file (playlist) 231, the play item 232 associated with the playback segment designation file (playlist) 231 starts to be played back in the clip information 252 of the image data clip 251. Since the point a and the reproduction end point b are included, the specific data areas a to b of the AV stream file 253 that is the content included in the image data clip 251 are reproduced. Further, since the sub play item 233 has a reproduction start point c and a reproduction end point d in the clip information 256 of the audio data clip 255, the specific data areas c to d of the audio data file 257 that is the content included in the audio data clip 255. Audio data is reproduced, and a browsable slide show is executed.

  In other words, the continuous playback of the still image acquired or generated from the AV stream file 253 is performed, and the browsable slide show that plays back the audio data acquired from the audio data file 257 is executed.

  When content stored on the disk is stored in units of data clips, one clip is stored in a continuous sector area, which is a continuous recording area of the disk, for example, but different clips are stored in continuous sector areas In some cases, the data is stored at a position separated by a predetermined sector. In such a data storage configuration, when content reproduction is performed by selecting the above-described reproduction section designation file (playlist) 232, it becomes necessary to jump between different clips during reproduction.

  In the case of the browsable slide show, since the AV stream file 253 that is the content included in the image data clip 251 and the audio data file 257 that is the content included in the audio data clip 255 are required, different clips are required. It is necessary to read the respective data by jumping the reading header between the recording area of the clip 251 and the recording area of the audio data clip 255.

The AV stream on the recording medium has the structure of a BDAV MPEG2 transport stream shown in FIG. BDAV means Blu-ray Disc Audio-Visual. The structure of the BDAV MPEG2 transport stream has the following characteristics.
(A) The BDAV MPEG2 transport stream is composed of an integer number of aligned units.
(B) The size of the aligned unit is 6144 bytes (2048 × 3 bytes).
(C) The aligned unit starts from the first byte of the source packet.
(D) The source packet is 192 bytes long. One source packet includes a TP_extra_header and a transport packet. TP_extra_header is 4 bytes long, and the transport packet is 188 bytes long.
(E) One Aligned unit consists of 32 source packets.

  Video stream and audio stream data is packetized into MPEG2 PES packets, and the PES packets are packetized into transport packets.

[2. Browseable slide show]
Next, a still image recording / playback method called a browsable slide show will be described. The browsable slide show is a process for reproducing still images together with sound. The playback order of still images is determined in advance, and the playback time of each slide is finite or infinite. As described above, when the slide playback time is infinite, it does not proceed to the playback of the next slide unless the user instructs the playback device to proceed with the slide playback. Therefore, each slide is not reproduced at a predetermined time on the time axis.

  A description will be given of a processing example in which an image and audio data are reproduced asynchronously by applying a play item corresponding to image data in the format described above with reference to FIG. 1 and a sub play item corresponding to audio data. To do. FIG. 3 is a diagram showing details of correspondence between a playlist and an audio data clip for executing a browsable slide show for reproducing audio asynchronously.

  The playlist includes a plurality of play items indicating a still image playback path and sub play items indicating an audio playback path. The playback start time (IN_time) and playback end time (OUT_time) of the sub play item are indicated by playback start and end time stamps in the audio stream, respectively.

  The playback device that executes the browsable slide show refers to the clip information and sets the data address information on the recording medium of the audio stream corresponding to the playback start time (IN_time) and playback end time (OUT_time) of the sub play item. Acquire, read and play audio using address information.

  Playback control information can be added to the playlist included in the playlist corresponding to the browsable slide show. That is, as the playback control information, a flag (is_repeat_Sub Play Item flag) indicating whether the playback section indicated by the playback start time IN_time and the playback end time Out_time of the audio stream is repeatedly played or only played once and the sub play Information (Sub Play Item_type) indicating that the reproduction of the item is asynchronous with the reproduction of the play item is added.

  In this case, the playback device can play back the sub play item by the following three methods. In the first method, when data of two files of a still image file referred to by a play item and an audio stream file referred to by a sub play item are read from a recording medium, the respective files are alternately read in a time division manner. Is the method. In this case, the playback device plays back still images and audio while alternately reading the data of the two files from the recording medium.

  In the second method, first, all data of the audio stream file referred to by the sub play item is read and stored in the buffer memory in the playback device. Next, the still image data referred to by the play item is read from the recording medium. The playback device plays back still images and audio while reading still image data from the recording medium and reading audio data from the buffer memory.

  In the third method, first, all data of a still image file referred to by a play item is read and stored in a buffer memory in the playback device. Next, the audio stream referred to by the sub play item is read from the recording medium. The reproduction device reproduces the still image and the audio while reading the audio stream from the recording medium and reading the still image from the buffer memory.

  Here, the second method is effective when the byte size of the audio stream file referred to by the sub play item is small, and the third method is the byte of the still image file referenced by the sub play item. Effective when the size is small.

  For example, as a practical example, if the size is about several megabytes (Mbytes), all file data can be read into the buffer memory prior to reproduction. As an application of the browsable slide show, the audio reproduction is BGM (Back Ground Music), and when the reproduction of the sub play item is repeatedly performed, for example, the data size of about 65 seconds of the audio stream having the bit rate of 256 kbps is about 2 megabytes ( Therefore, the second method is effective.

  Next, the configuration of a playback device (player model) that executes playback processing will be described. FIG. 4 is a block diagram showing a reproducing apparatus that reads and reproduces data by the first method. In this method, a main transport stream (still image file) (hereinafter referred to as a main TS) referred to by a play item and an audio transport stream (hereinafter referred to as an audio TS) referred to by a sub play item are used. When data of one file is read from the drive (recording medium), each file is alternately read in a time division manner.

  The playback device plays back still images and audio while alternately reading data of two files (main TS and audio TS) via a reading unit (header) 331 that accesses the recording medium. Each file data read by the reading unit 331 is demodulated by the demodulation / ECC decoding unit 332, and error correction is performed on the demodulated multiplexed stream. Then, the source packet data of the main TS file is buffered in a main TS read buffer (Read Buffer) 333 that buffers the main TS, and the source packet data of the audio TS file is an audio that buffers the audio TS. Buffered in the TS read buffer 334.

The stream data read from the main TS read buffer 333 is supplied to a main player (BDAV MPEG2 TS Player Model_1) 335 described later. The main player 335 outputs the stream data read from the main TS read buffer 333 at the transmission rate R _MAX1 to the _subsequent main PID (packet ID) filter 337 at a predetermined timing (transmission rate R _TS1 ).

The stream data read from the audio TS read buffer 334 is supplied to an audio player (BDAV MPEG2 TS Player Model_2) 336, which will be described later. The audio player 336 outputs the stream data read from the audio TS read buffer 334 at the transmission rate R _MAX2 to the _subsequent audio PID filter 339 at a predetermined timing (transmission rate R _TS2 ).

  The main PID filter 337 distributes the input main TS to the decoder of each elementary stream in the subsequent stage according to the PID (packet ID), and outputs it. That is, system information such as still image (video), sub-image information (graphics and subtitle (caption), etc.), and main TS PSI (Program Specific Information: Program Specification Information) and SI (Service Information) are respectively transcoded. It is distributed to the port buffers TB1, TB2 and TBsys1. SI is a table describing additional information of TS, and indicates a non-MPEG2 standard. SI is also packetized into transport packets. SI includes SIT (Selection Information Table) and the like.

Transport packet of the still image is transmitted to the multiplex buffer MB at a constant rate Rx ₁ from the transport buffer TB1, it is transmitted further to a constant rate Rbx ₁ in elementary stream EB, which is decoded by the decoder D1 output. Further, the transport packet of the sub-image information is transmitted from the transport stream buffer TB2 to the buffer B2 at a constant rate Rx2, and decoded and output by the decoder D2. Moreover, the transport packet of the system information is transmitted to the buffer Bsys1 at a constant rate _{Rx sys} from the transport buffer TBsys1, which is decoded by the decoder Dsys1 output.

Similarly, the audio PID filter 338 distributes the input audio transport stream to a decoder of each elementary stream in the subsequent stage according to the PID (packet ID) and outputs the result. That is, the audio transport packet is transmitted from the transport buffer TB4 to the main buffer B4 at a constant rate Rx4, and is decoded and output by the decoder D4. Moreover, the transport packet of the system information of the audio TS is transmitted to the buffer Bsys2 from transport buffer TBsys2 at a constant rate _{Rx sys,} is output after being decoded is transmitted to the decoder Dsys2 further at a constant rate _{R sys.}

  An audio switch (Audio SW) 339 is provided between the audio PID filter 338 and the transport stream buffers TB4 and TBsys. The audio switch 339 is a non-browsable mode (synchronized playback of image data and audio data based on data in which audio data is integrated into an image data file, for example, a data file in which an audio stream is multiplexed on the main TS. (Also referred to as a time-based mode) and a play item corresponding to the image data file described above with reference to FIG. 2 and a sub play item corresponding to the audio data file are applied. Switching control is performed between a case where a slide show in a browsable mode in which data and audio data are asynchronously reproduced is reproduced.

  That is, the audio switch 339 is connected to the main PID filter 337 to which the data from the main TS read buffer 333 is supplied and the audio to which the data from the audio read buffer 334 is supplied. And a browsable mode switch SWB connected to the PID filter 338 for switching, and this is switched to supply an audio stream to the transport buffer TB4.

  For example, in the case of a browsable slide show, the audio switch 339 is on the side of the browsable mode switch SWB. Therefore, in this case, the audio stream is transmitted from the audio TS read buffer 334 via the audio PID filter 338 to the audio decoder D4. Supplied to. For example, in the case of a non-browsable mode slide show, when the audio stream is multiplexed on the main TS, the audio switch 339 is on the non-browsable mode switch SWT side and is multiplexed on the main TS. The audio stream is supplied from the main TS read buffer 333 to the transport buffer TB4 or TBsys2 via the main PID filter 337.

  Next, an elementary stream decoder will be described. The notation of TBn, MB, EB, TBsys, Bsys, Rxn, Rbxn, Rxsys, Dn, and Dsys is defined in ISO / IEC13818-1 (MPEG2 Systems standard) T-STD (System Target Decoder). Is the same. That is, it is as follows.

TBn (n = 1 to 5): transport buffer MB of elementary stream n: multiplex buffer of video stream EB: elementary stream buffer of video stream TBsys: input buffer Bsys for program information being decoded: decoding Main buffer in the system target decoder for system information of the program in it Rxn: Transmission rate at which data is removed from TBn Rbxn: Transmission rate at which PES packet payload is removed from MBn (only present for video streams)
Rxsys: Transmission rate at which data is removed from TBsys Dn: Decoder for elementary stream n Dsys: Decoder for system information of program being decoded

  Next, the main player (BDAV MPEG2 TS Player_1) 335 and the audio player (BDAV MPEG2 TS Player_2) 336 included in the player model shown in FIG. 4 will be described. FIGS. 5A and 5B are block diagrams showing the main player 335 and the audio player 336, respectively.

As shown in FIG. 5A, in the main player 335, the source packet data read from the main TS read buffer 333 is input to the source _depacketizer unit 371 at the bit rate R _MAX1 . R _MAX1 is the bit rate of the source packet stream of the main TS file.

  An arrival time clock counter 372 is a binary counter that counts the 27 MHz frequency pulses output from the pulse oscillator (27 MHz X-tal) 373. Then, the arrival time clock counter outputs the count value Arrival_time_clock (i) at time t (i).

  The main TS and the audio TS are composed of a data string having a source packet having a transport packet and its arrival time stamp as a unit, and one source packet has one transport packet and its arrival_time_stamp (ATS). The arrival_time_stamp is a time stamp indicating the time at which the corresponding transport packet arrives at the decoder in the main TS or the audio TS. A time axis created based on arrival_time_stamp of each source packet constituting each stream is referred to as an arrival time base, and its clock is referred to as an ATC (Arrival Time Clock).

When the arrival_time_stamp of the current source packet read from the main TS is equal to the LSB (least Significant Bit) 30-bit value of the count value arrival_time_clock (i) of the arrival time clock counter 372 The transport packet of the source packet is output from the source depacketizer 371. R _TS1 is the bit rate of the main TS.

Further, as shown in FIG. 5B, in the audio player 376, the source packet data read from the preceding audio TS read buffer 334 is input to the source depacketizer 374 at the bit rate R _MAX2 . The bit rate R _MAX2 is the bit rate of the source packet stream of the audio TS file.

The arrival time clock counter 375 and the pulse oscillator 376 operate in the same manner as the main player 335. The source depacketizer 374 functions in the same manner as the main player 335. That is, when the arrival_time_stamp of the current source packet is equal to the value of the LSB 30 bits of the count value arrival_time_clock (i) of the arrival time clock counter 375, the transport packet of the source packet is output from the source depacketizer unit 374. R _TS2 is the bit rate of the audio TS.

R _MAX1, the relationship between _{R MAX2} and _{R TS1, R TS2} will be described in detail.
R _MAX1 is a maximum reading rate of image data included in the recording data,
R _MAX2 is a maximum reading rate of audio data included in the recording data,
And
R _TS1 is the transmission rate of the transport stream based on the image data included in the recording data,
R _TS2 is the transport stream transmission rate based on the audio data included in the recording data.

As described with reference to FIGS. 4 and 5, the main (image data) player (BDAV MPEG2 TS Player — 1) 335 included in the player model shown in FIG. 4 is read from the main TS read buffer 333 in the preceding stage. The received source packet data is input at the bit rate R _MAX1 . R _MAX1 is the bit rate of the source packet stream of the main TS file (the maximum read rate of image data included in the recording data).

The source _depacketizer 371 (see FIG. 5) of the main (image data) player 335 performs depacketization processing on the source packet based on the count value of the arrival time clock counter 372, which is input at the bit rate R _MAX1. The processing data is output from the source depacketizer unit 371 at the bit rate R _TS1 .

That is, the source packet stream of the main TS file is _input to the main (image data) player (BDAV MPEG2 TS Player_1) 335 at a bit rate _MAX1 from the main TS read buffer 333 shown in FIG. Here, the depacketizing process is executed, and is output as the 188-byte base data from the main (image data) player 335 shown in FIG. 4 at the bit rate R _TS1 .

The same applies to the audio TS file constituting the audio data, as the source packet stream 192 byte based data, audio player at the bit rate _MAX2 from the audio TS read buffer 334 shown in FIG. 4 (BDAV MPEG2 TS Player Model_2) is input to 336, where, by depacketizing process is performed, as 188-byte based data is output at the bit rate _{R TS2.
Therefore,} the relationship R _{MAX1, R MAX2} and _{R TS1, R TS2} is as follows.
R _MAX1 = R _TS1 × (192/188)
R _MAX2 = R _TS2 × (192/188)

FIG. 6 is a diagram illustrating the concept of a buffer model for a slideshow in the browsable mode. In the browseable mode, when the main TS file, which is a still image file referred to by the play item, and the audio TS file referred to by the sub play item are alternately read out from the drive at a rate R _UD in a time-division manner, the source packet of the main TS it is necessary to and a stream bit rate _{R MAX1} and bit rate of the source packet stream of audio TS _{R MAX2} is guaranteed.

  FIGS. 7A and 7B show examples of the bit occupancy of the elementary stream buffer EB (video code buffer) and the bit occupancy of the audio code buffer B4 at the time of the slide show in the browserable mode shown in FIG. It is a graph. 7A and 7B, the vertical axes indicate the buffer occupancy rates of the video code buffer and the audio code buffer, respectively, and the horizontal axes indicate the system time clock STC of the main TS and the audio TS, respectively.

As shown in FIG. 7A, the startup delay (start up delay) is the time from when the first video packet is input t _V until the I-picture is buffered in the elementary stream buffer EB ( DTS: Decoding Time Stamp). In the browserable mode, when the user skips to the next still image (slide), input of the first video packet is started. 7A and 7B, the slope k _EB indicates the input rate to the video buffer EB, and the slope k _B4 indicates the input rate of the audio buffer B4. In FIG. 7A, the time when the inclination k _EB is zero and the video code occupancy is a constant value indicates the time during which sub-image information such as graphics and subtitles is read.

If it can be _ensured that the source packet stream of the main TS is read at the bit rate R _MAX1 , the video decoder D1 shown in FIG. 4 can decode the still image in time for a predetermined decoding timing. If it can be ensured that the source packet stream of the audio TS is read at the bit rate R _MAX2 , the audio decoder D4 shown in FIG. 4 can decode the audio data in time for a predetermined decoding timing.

  FIG. 8 is a schematic diagram showing a model of a method for simultaneously reading out the main TS and the audio TS in the slide show in the browserable mode.

  Each of the main TS and the audio TS is assumed to be continuously arranged on the disc. At this time, the main TS and the audio TS are alternately read as follows.

(1) A predetermined data amount x is read from the main TS.
(2) Jump to a predetermined data position of the audio TS.
(3) A predetermined data amount y is read from the audio TS.
(4) Jump to a predetermined data position of the main TS. Then, a predetermined data amount x is read from the main TS.

The data amount x read from the main TS by one read action is the minimum value of the required size RB1 of the main TS read buffer 333. Further, the data amount y read from the audio TS by one read action is the minimum value of the required size RB2 of the audio TS read buffer 334. The following equation (1) shows an equation (equation 1) for calculating the sizes necessary for the main TS read buffer 333 and the audio TS read buffer 334.
... (Formula 1)
However,
RB1: Size required for the main TS read buffer 333> = Data amount to be read from the main TS by one read action RB2: Size required for the audio TS read buffer 334> = In one read action from the audio TS Data amount to be read T _JUMP : Jump time R _UD : _Read bit rate from drive R _MAX1 : Bit rate of source packet stream of main TS (maximum read bit rate)
R _MAX2 : Bit rate of audio TS source packet stream (maximum read bit rate)
It is.

For example, the following conditions:
Read rate from drive: R _UD = 54 Mbps
Jump time: T _JUMP = 1.01 seconds Bit rate of main TS source packet stream: R _MAX = 15 Mbps
Bit rate of source packet stream of audio TS: R _A = 2.0 Mbps
Then,
Size required for the main TS read buffer 333: x = 3.90 MBytes
Size required for the audio TS read buffer 34: y = 0.698 MBytes
It becomes.

Of the above parameters,
R _UD: reading from the drive bit rate R _MAX1: bit rate of the source packet stream of the main TS R _MAX2: bit rate of the source packet stream of audio TS is basically the drive device, the reproduction processing of the processing power, data packet It is a value determined according to the amount,
T _JUMP : Jump time is a value that varies depending on the jump distance executed on the disk. In the above example, an assumed example is shown in which the jump time: T _JUMP = 1.01 seconds, but this is a temporary setting of one jump processing value, and the jump time: T _JUMP is on the disc. It differs depending on the jump distance to be executed.

When the jump time T _JUMP becomes longer due to an increase in the jump distance executed on the disk, the buffer data amount based on the above calculation becomes insufficient, and there is a possibility that data reproduction is interrupted. Therefore, it is necessary to specify the data arrangement so that the jump time T _JUMP is less than a certain time, and to perform data recording according to the specified format. Data recording in such a format causes data interruption. Seamless playback is possible without causing it to occur.

Hereinafter, details of the jump time T _JUMP in the above formula and a data recording configuration for seamlessly executing a browsable slide show that is a parallel image and audio playback process without data interruption will be described.

[3. Jump processing and content storage format]
In order to reliably execute uninterrupted playback processing when playback occurs on a disc-type information recording medium storing content, the storage location of the content is specified and the longest allowable jump generation distance is specified. It is necessary to set a jump distance and store contents according to this setting.

  In a DVD (Digital Versatile Disc) as a disc-type recording medium, a jump start point is used as a standard for a drive that performs disc playback in order to enable continuous playback when a jump occurs in one recording layer. The drive standard is defined so that the time from the end of playback at the start to playback at the jump destination is within a predetermined time.

  This drive standard will be described with reference to FIG. In FIG. 9, the disk 501 mounted on the spindle motor 500 rotates, and data is reproduced and recorded by a pickup (not shown). Content stored on the disc is stored in units of sectors of a predetermined amount of data.

  In the graph shown in FIG. 9, the horizontal axis is the jump distance indicated by the number of sectors, and the vertical axis is the access time [ms]. As shown in the graph of FIG. 9, the DVD drive standard defines a maximum allowable access time when a jump corresponding to a predetermined number of sectors occurs.

  A drive device that can be accessed with jump processing within the maximum allowable access time shown in FIG. 9 is compliant with the standard so that seamless playback is guaranteed even if a jump occurs in the same layer during content playback. Content is stored on the DVD. That is, the contents stored in the disc are arranged so that the jump processing at the position exceeding the maximum allowable access time does not occur as shown in the graph of FIG.

  However, a data recording format of image data and audio data suitable for execution of a browsable slide show in which still images are continuously reproduced and audio is also read and reproduced is not defined. The present invention provides a configuration that enables a slidable slide show to be executed seamlessly without data interruption, and the details thereof will be described below.

  First, the outline of the data recording / reproducing process accompanied by the jump process will be described. Referring to FIG. 10, seamless playback is realized in consideration of both jumps in the same layer disk (intra-layer jump) and jumps between disks in different layers (interlayer jump) in a disc having a plurality of recording layers. Consider the necessary conditions to do this.

  FIG. 10A shows a two-layer disk structure. Data is recorded on the first layer 511 and the second layer 512 in units of sectors which are content data recording units. The recorded data includes the image data clip and audio data clip described above with reference to FIG.

  When a disc storing content is played back, jump processing corresponding to the playback mode of the content occurs. For example, when performing playback processing of different AV streams, or when performing playback of a browsable slide show that is executed while alternately reading image data clips and audio data clips.

  There are two modes of jump processing in reproducing a disc having a structure having a plurality of recording layers. That is, a jump process between recording areas of the same layer and a jump process between recording areas of different layers. The present invention realizes a configuration that enables seamless reproduction during an interlayer jump, and calculates the total time required for the interlayer jump.

FIG. 10A is a table showing an example of the intra-layer jump time [T _ACC ] corresponding to the jump distance in a disc configuration in which one layer has a recording capacity of 23.3 GB. From the top of the table, “jump distance (sector or stroke)”, “data size corresponding to jump distance (MB)”, and “intra-layer jump time (ms)” are shown. The “intra-layer jump time (ms)” corresponds to the time required to move the pickup of the drive device for reproducing the Blu-ray disc, that is, the seek time.

  In the table shown in FIG. 10A, in “jump distance (sector or stroke)”, 40000 sectors or less are displayed as sectors, and 1/10 strokes or more are displayed as strokes. As shown in FIG. 10A, the full stroke corresponds to a stroke from the innermost circumference to the outermost circumference of the disk.

The jump distance in 40000 sectors and 1/10 stroke is
40000 sectors <1/10 stroke, and the jump distance increases from left to right in the table. The reason why strokes are indicated in a portion where the jump distance is large is that when the jump distance is large, the number of sectors differs greatly between the inner and outer circumferences of the disk, and the range of the number of sectors becomes too large when expressed in terms of the number of sectors.

  For 1/10 stroke, 1/3 stroke, and half stroke, the lower limit of the data size is indicated, but this corresponds to the inner and outer circumferences of the disc even if the same 1/10 stroke is used. Since the data size to be used is different, the lower limit is described using the calculated value at the inner circumference where the data becomes the smallest. Note that when determining the data arrangement conditions described later, it is sufficient if the lower limit of the data size corresponding to a specific jump distance is known, so the upper limit of the corresponding data size is not described.

For example, jump distance = full stroke corresponds to the stroke from the innermost to the outermost circumference of the disc, and the amount of jump data at this time is 23.3 GBytes. The time required for this intra-layer full stroke jump, that is, the intra-layer jump time [T _ACC ] is 1220 ms.

When the jump distance is 0 to 5000 sectors, the jump data amount is 0 to 10 × 2 ²⁰ bytes, and the time required for this intra-layer jump, that is, the intra-layer jump time [TACC] is 179 ms.

FIG. 10 (2) shows the measured value of the interlayer jump time [T _IL ] in a certain drive device. That is,
Interlayer jump time [T _IL ] = 360 ms
This is due to an adjustment time for focus control of the pickup when the playback position is changed to a different layer of the first layer 511 and the second layer 512 in FIG. 10A in the drive device that plays back a Blu-ray disc. Equivalent to.

FIG. 10 (3) shows the measured value of the overhead time [T _OH ] that occurs when ECC block boundary reading is performed in a certain drive device. That is,
[T _OH ] = 20 ms
It is.

  When reading content stored on a Blu-ray disc, a predetermined data reading unit is set. A data reading unit is called an ECC block. The ECC block is configured as a block including user data including, for example, AV stream data as actual content data, user control data (UCD) in which various control data are stored, parity data for error correction, and the like. .

  When reproducing content, it is necessary to read data in units of ECC blocks and execute data processing such as error correction based on parity in units of ECC blocks.

When a jump is executed in data reproduction, it is necessary to process two different ECC blocks: an ECC block at the jump source and an ECC block at the jump destination. The overhead time associated with the processing of the ECC block is the overhead time [T _OH ] generated at the ECC block boundary reading shown in FIG.

As described above, when the interlayer jump is executed, the interlayer jump time [T _ACC ] shown in FIG. 10 (1), the interlayer jump time [T _IL ] shown in FIG. 10 (2), and FIG. When the ECC block read overhead time [T _OH ] shown is generated and the interlayer jump is executed as a result, the total interlayer jump time [T _JUMP ] as the time at which data reading from the disk is interrupted is
T _JUMP = T _ACC + T _IL + T _OH
Is calculated as

  The details of the overhead time associated with the ECC block processing that occurs during the jump processing will be described with reference to FIG.

  In the data reading / reproducing process from the disk, as shown in FIG. 11A, first, the disk 521 is read in units of ECC blocks and stored in the buffer 522. Further, the decoding unit 523 performs decoding processing on the data output from the buffer. Note that processing such as error correction processing is performed before decoding processing, but is omitted in the drawing. The decoding unit 523 executes decoding with the reproduction order and reproduction time adjusted according to the time stamp information set in the transport stream (TS) constituting the AV stream data in the ECC block, and the decoded data is output as reproduction content Is done.

  The decoding unit 523 can continuously reproduce as long as the ECC block stored in the buffer 322 exists. The lower graph in FIG. 11 shows the transition of the playback time and the transition of the amount of data stored in the buffer 522.

  The amount of buffer data on the vertical axis indicates that data reading from the disk stops when a jump occurs, the data amount starts to decrease, and when the jump ends, data reading from the disk resumes and the buffer data amount increases. become. When the buffer data amount becomes zero and the output data from the decoding unit 523 is completed, the reproduction is interrupted. Therefore, it is necessary to set a buffer size for preventing the buffer data amount from becoming zero.

In the example shown in FIG. 11, when an interlayer jump occurs during the processing of the ECC block [SECC1] 532 included in the read data 531 from the disk, the data acquisition from the disk is interrupted, and the read data 534 at the jump destination is read. The seek processing is performed at the ECC block position of the ECC block [SECC2] 533 at the start position, and further pickup control is performed. Thereafter, the ECC block [S _ECC2 ] 533 is acquired, and buffer storage and decoding processing are performed to reproduce data. Is executed.

In this case, it is necessary to perform error correction and decoding processing of the final ECC block [S _ECC1 ] 532 of the jump source, and error correction and decoding processing of the first ECC block [S _ECC2 ] 533 of the jump destination. Not all data generated by the above process is output as reproduction data.

In the worst case, useless data processing time occurs in which most of the processing data of these two ECC blocks is not used as reproduction data. The time required for this data processing is defined as the ECC block read overhead time [T _OH ] shown in FIG.

The overhead time [T _OH ] in the worst case when the stored data of the ECC block data of the jump source and the ECC block data of the jump destination is hardly used for reproduction.
T _OH = (2 × ECC_size) / R _UD
It becomes.
In the above equation, ECC_size is the data size of one ECC block, R _UD is the read rate, and corresponds to the transfer rate of data output from the buffer 522 to the decoding unit 523.

For example,
ECC block size = 64KB
Data transfer rate R _UD = 54 Mbps
If
T _OH ≦ (2 × 64 × 1024 × 8) / 54/10 ⁶
= 20 ms
Is calculated as

That is, the maximum value of the ECC block read overhead time [T _OH ] is calculated as 20 ms.

The reduction speed of the buffer data amount depends on the data recording rate [R _TS ]. This data recording rate [R _TS ] is a rate corresponding to the data consumption amount accompanying data processing in the decoding unit 523.

  The amount of reproduction data included in one ECC block is not constant because of the difference in compression rate, and the amount of reproduction data, that is, the reproduction data time, differs for each ECC block.

  Therefore, when the interlayer jump occurs, the buffer data amount reduction speed is not always constant. With reference to FIG. 12, a decrease in the amount of buffer data when an interlayer jump occurs will be described.

  Similar to the graph shown in FIG. 11, the graph shown in FIG. 12A shows the passage of the reproduction time and the transition of the amount of data stored in the buffer.

  The amount of buffer data on the vertical axis indicates that data reading from the disk stops when a jump occurs, the data amount starts to decrease, and when the jump ends, data reading from the disk resumes and the buffer data amount increases. become. When the buffer data amount becomes zero and the output data from the decoding unit ends, reproduction is interrupted. Therefore, it is necessary to set a buffer size for preventing the buffer data amount from becoming zero.

In order to define the maximum buffer amount [S _RB ], it is necessary to assume a reduction speed of the buffer data amount during the jump period. However, the reduction speed of the buffer data amount is not always constant as described above.

Therefore, some assumption is set, and the buffer data amount [S _RB ] is determined under the assumption of the decrease speed of the buffer data amount in the jump period.

Line [1] in the graph shown in FIG. 12A sets the speed of decrease of the buffer data amount in the jump period based on the average rate at the time of reading and reproducing the continuous recording data area recorded on the disc. Line.
Line [2] in the graph calculates the decrease speed of the buffer data amount during the jump period based on the reproduction rate by extracting the data that actually causes the jump, not the continuous recording data area recorded on the disc. The line is set based on the average rate.
Line [3] in the graph is a line set based on the maximum recording rate of the recording data set as attribute information corresponding to the content recorded on the disc.

  The graph of FIG. 12B shows the values of the assumed rates of [1], [2], and [3] shown in (A). The vertical axis represents the data output bit rate during reproduction, and the horizontal axis represents the reproduction time.

As shown in the figure, the output bit rate is
[1] <[2] <[3]
Therefore, at the time of reproducing the continuous recording data area of the disc, reproduction is executed along a line with an output bit rate of approximately [1], and when a jump occurs, the output bit rate is approximately [2]. Playback along the line is executed.

  Assuming that the reduction speed of the buffer data amount during the jump period is [1], that is, the average reproduction rate of the continuous recording data area recorded on the disc is applied, [1] is applied as shown in FIG. The buffer data amount decreases at a speed higher than the bit rate, and in the worst case, there is a possibility that the buffer data amount is lost and the reproduction is interrupted. Further, when [2], that is, the average rate calculated based on the playback rate in the jump period is applied, the applied assumed bit rate and the actual buffer data reduction speed exactly match. For this reason, [2] can be said to be the theoretically assumed bit rate, but in reality it is very difficult to specify the position of the data corresponding to the start and end points of the jump period and is used in [2]. It is difficult to calculate the assumed bit rate.

  On the other hand, according to the assumption [3] shown in FIG. 12A, that is, the assumption based on the maximum recording rate set as attribute information corresponding to the content recorded on the disc, the reproduction bit rate of the recorded data on the disc Is guaranteed not to exceed the bit rate of [3] shown in FIG. 12B, and even when a jump occurs, reproduction processing exceeding the bit rate of [3] does not occur. The bit rate of [3] is set as attribute information at the time of content production, and the bit rate value can be easily obtained by referring to the attribute information.

Accordingly, assuming that reproduction is performed at a bit rate corresponding to the maximum recording rate of [3], it is assumed that a decrease in the buffer data amount at the time of jump occurs, and under this assumption, the maximum buffer amount [S _RB ] is calculated.

In the Blu-ray Disc standard, a 188-byte transport stream (TS) packet (TS packet recording rate is TS_recording_rate) is attached to a 4-byte header and recorded as a 192-byte packet on the disc. When viewed as a 192-byte packet, the maximum recording rate [R _MAX ] is
R _MAX = (TS_recording_rate) × 192/188
It becomes.

In reproducing a disc on which data has been recorded in accordance with the Blu-ray Disc standard, reproduction is performed at a maximum recording rate [R _MAX ] or less calculated based on this TS packet size. Therefore, when reproduction with an interlayer jump is performed, the buffer size [S _RB ] necessary for the buffer data not to become 0 during the jump is:
S _RB = R _MAX × T jump
Is calculated as

  Next, with reference to FIG. 13, a setting example for guaranteeing reproduction without data interruption for an interlayer jump will be described. When setting the data recording rules for the disc, determine the allowable jumping between layers, that is, the jump range that can prevent the occurrence of data interruption, and record the content in such a manner that only the determined jump range occurs. It is necessary to do it.

FIG. 13 shows a setting example of allowable interlayer jump modes and a calculation example of the total jump time [T _JUMP ] in the jump processing. As described above, the total jump time is
Time equivalent to pickup movement (seek) time [T _ACC ]
Pickup adjustment time [T _IL ]
Overhead time due to ECC block processing [T _OH ]
The sum of
T _JUMP = T _ACC + T _IL + T _OH
Is calculated as

The example of FIG. 13A1 is an example in which a full stroke interlayer jump from the innermost circumference of the first layer to the outermost circumference of the second layer is allowed, and the total jump time [TJUMP] in this case is
T _JUMP = 1220 (T _ACC ) +330 (T _IL ) +20 (TOH)
= 1600ms
It becomes.
Note that the time [T _ACC ] corresponding to the movement (seek) time of the pickup, the adjustment time [T _IL ] of the pickup, and the overhead time [T _OH ] resulting from the ECC block processing are described with reference to FIG. Based on the example described.

  If the arrangement condition of the recording data with respect to the disc is determined based on this case, continuous supply of data can be guaranteed even if a jump is made between arbitrary addresses in the recording medium. However, since the jump time is set longer than (A2) and (A3), which will be described later, it is necessary to guarantee the continuous supply of data, as will be described with reference to FIG. The buffer size increases.

The example of FIG. 13 (A2) is an example in which a half stroke same-layer jump and a 1/10 stroke interlayer jump are set as the maximum allowable jump distance, and the total jump time [TJUMP] in this case is
(1) Half stroke jump in the same layer T _JUMP = 990 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 1010ms
(2) 1/10 stroke interlayer jump T _JUMP = 650 (T _ACC ) +360 (T _IL ) +20 (T _OH )
= 1030ms
It becomes.
The maximum jump time is 1030 ms.

In this model, approximately in a layer in the jump [8.2 × ² 30/2048] sectors, each limiting the jump distance in the range of about [3 × ² 30/2048] sector jump, determines the data arrangement conditions However, as will be described with reference to FIG. 14, the buffer size necessary for guaranteeing the continuous supply of data is smaller than the model (A1).

The example of FIG. 13 (A3) is an example in which 1/10 stroke jump in the same layer and 40000 sector interlayer jump are set as the maximum allowable jump distance, and the total jump time [TJUMP] in this case is
(1) 1/10 stroke jump in the same layer T _JUMP = 650 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 670ms
(2) 40000 sector interlayer jump T _JUMP = 330 (T _ACC ) +360 (T _IL ) +20 (T _OH )
= 710ms
It becomes.
The maximum jump time is 710 ms.

In this model, approximately in a layer in the jump [1.2 × ² 30/2048] sector, by limiting each jump distance in the range of 40000 sector inter-layer jump, it is necessary to determine the data arrangement conditions, FIG. 14 As will be described below, the buffer size necessary for guaranteeing the continuous supply of data is smaller than the models (A1) and (A2).

FIG. 14 is a diagram for explaining a method for determining the continuous data arrangement condition corresponding to the value of the data recording rate with respect to the jump time. Based on the total jump time [T _JUMP ], the data reading rate [Rud] from the disc in the drive, and the data recording rate [R _MAX ], the shortest allowable playback time [t] corresponding to the minimum data unit to be continuously arranged on the disc Is calculated. The continuous data arrangement size [Usize] is calculated by multiplying the shortest allowable reproduction time [t] of the continuous data by the data read rate [Rud]. That is,
Usize = Rud × t
It is. Details of the processing for calculating the continuous data arrangement size [Usize] will be described.

  In FIG. 14, the horizontal axis represents the reproduction time, and the vertical axis represents the amount of data read from the disk and the amount of reproduction data. The solid line indicates the transition of the read data amount 601 from the disc as the playback time elapses, and the dotted line indicates the transition of the playback data amount 602 as the playback time elapses.

  The difference between the read data amount 601 and the reproduction data amount 602 corresponds to the buffer data amount 603. As the reproduction data amount 602, a certain amount of data is reproduced as the reproduction time elapses, and the reproduction data amount 602 increases in proportion to the time as shown in the figure.

  On the other hand, when the jump occurs, the read data amount 601 stops reading data from the disk. Therefore, the increase in the read data amount 601 is stopped, and a constant read rate is applied in the read processing of the continuous data storage area other than the jump. For example, data reading is executed at 54 Mbps.

  The difference between the read data amount 601 and the reproduction data amount 602 shown in FIG. 14 is the buffer data amount 403. If the buffer data amount 603 is set so as not to become 0 or less even when jump processing occurs, reproduction is performed in jump reproduction. Seamless playback is possible without interruption.

  In order to increase the buffer data amount 603 as the difference between the read data amount 601 and the reproduction data amount 602 when the read data amount 601 and the reproduction data amount 602 are constant, the value of [Usize] shown in FIG. Just make it bigger.

  [Usize] shown in FIG. 14 corresponds to the size of data on which continuous reading is performed without jump processing on the disc. This data size is called a continuous data arrangement size [Usize].

Based on the total jump time [T _JUMP ], the data read rate from the disc in the drive [Rud], and the data recording rate [R _MAX ], the shortest allowable playback time [t] of the continuously arranged data on the disc is calculated according to the following formula: Is done. That is,
t = T _JUMP × Rud / (Rud-R _MAX )
It is.

  If data is recorded on the disk as a data block having a minimum allowable playback time [t] of continuous data, the buffer data does not become 0 or less when a jump occurs and continuous playback is guaranteed.

The continuous data arrangement size [Usize] is calculated by multiplying the minimum allowable reproduction time [t] of the continuous data calculated according to the above formula by the data recording rate [RTS]. That is,
Usize = R _MAX × t
It becomes.

  If data is recorded on the disk as a data block having a continuous data arrangement size [Usize] or more, the buffer data does not become 0 or less when a jump occurs, and continuous reproduction is guaranteed.

A specific example of calculating the continuous data arrangement size [Usize] will be described. The total jump time [T _JUMP ], the data reading rate [Rud] from the disc in the drive, and the data recording rate [R _MAX ] are as follows.
TJUMP [msec]: intralayer access time T _ACC + interlayer jump time T _IL + overhead T _OH due to ECC block boundary
Rud [× 10 ⁶ bps]: Read rate = 54 Mbps
R _MAX [× 10 ⁶ bps]: Maximum recording rate (TS_recording_rate × 192/188)

At this time,
t [msec]: Minimum allowable reproduction time of continuous data Usize [× 2 ²⁰ bytes]: Continuous data arrangement size is calculated.

The minimum allowable playback time [t] of continuous data and the continuous data arrangement size [Usize] are:
t (msec) = TJUMP × Rud / (Rud−R _MAX )
Usize (Byte) = t / 1000 × R _MAX / 8
Is calculated as

For example, when the continuous data arrangement size [Usize] is calculated by applying the above formula to the model shown in FIG. 13 (A2), that is, TJUMP = 1030 ms,
R _MAX = (TS_recording_rate × 192/188) = 40 Mbps
If
Use (Byte) = 20.6 MByte
Is calculated as

That is, when the model shown in FIG. 13 (A2), that is, when the maximum jump time is set to TJUMP = 1030 ms, the data recording on the disc is
Continuous data arrangement size [Usize] = 20.6 MByte
That is, it is necessary to set a continuous data arrangement area of 20.6 MBytes or more and perform data recording.

As described above, the minimum allowable reproduction time [t] of continuous data and the continuous data arrangement size [Usize] are
t (msec) = T _JUMP × Rud / (Rud-R _MAX )
Use size (Byte) = t / 1000 × RTS / 8
Therefore, if the maximum jump time [T _JUMP ] is set large, it is necessary to set both the shortest allowable playback time [t] and the continuous data arrangement size [Usize] large, and accordingly the buffer size is also large. It is necessary to set it.

FIG. 15 is necessary for guaranteeing continuous supply of data using the calculation method described with reference to FIG. 14 in each of the plurality of jump models (A1) to (A3) described with reference to FIG. FIG. 6 is a table showing data arrangement conditions (minimum continuous data arrangement size) corresponding to various values of a buffer size (SRB) and a data recording rate (R _MAX ).

As described with reference to FIG.
(A1) is a case where a full stroke interlayer jump from the innermost circumference of the first layer to the outermost circumference of the second layer is allowed, and the total jump time [T _JUMP ] in this case is
T _JUMP = 1220 (T _ACC ) +360 (T _IL ) +20 (T _OH )
= 1600 ms.

At this time, the required buffer size [S _RB ] is
SRB = 9.36 MByte, and
The data arrangement condition (minimum continuous data arrangement size) corresponding to each value of the data recording rate (RMAX) is
R _MAX = 5 × 192 / 188Mbps → Continuous data allocation size [Usize] = 1.1Mbyte
R _MAX = 10 × 192/188 Mbps → Continuous data allocation size [Usize] = 2.4 Mbyte
R _MAX = 20 × 192/188 Mbps → Continuous data allocation size [Usize] = 6.3 Mbyte
R _MAX = 30 × 192/188 Mbps → Continuous data allocation size [Usize] = 13.6 Mbyte
R _MAX = 40 × 192 / 188Mbps → Continuous data allocation size [Usize] = 32.0Mbyte
R _MAX = 48 × 192 / 188Mbps → Continuous data arrangement size [Usize] = 101.5 Mbyte
It becomes.

The example of (A2) is an example in which a half stroke same-layer jump and a 1/10 stroke interlayer jump are set as the maximum allowable jump distance, and the total jump time [TJUMP] in this case is
(1) Half stroke jump in the same layer T _JUMP = 990 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 1010ms
(2) 1/10 stroke interlayer jump T _JUMP = 650 (T _ACC ) +360 (T _IL ) +20 (T _OH )
= 1030ms
The maximum jump time is 1030 ms.

At this time, the required buffer size [S _RB ] is
SRB = 6.02 MByte, and
The data allocation condition (minimum continuous data allocation size) corresponding to each value of the data recording rate (R _TS ) is
R _MAX = 5 × 192 / 188Mbps → Continuous data allocation size [Usize] = 0.7Mbyte
R _MAX = 10 × 192 / 188Mbps → Continuous data allocation size [Usize] = 1.6 Mbyte
R _MAX = 20 × 192 / 188Mbps → Continuous data allocation size [Usize] = 4.1 Mbyte
R _MAX = 30 × 192 / 188Mbps → Continuous data allocation size [Usize] = 8.7 Mbyte
R _MAX = 40 × 192 / 188Mbps → Continuous data allocation size [Usize] = 20.6Mbyte
R _MAX = 48 × 192/188 Mbps → continuous data allocation size [Usize] = 65.3 Mbyte
It becomes.

The example of (A3) is an example in which 1/10 stroke jump in the same layer and 40000 sector layer jump are set as the maximum allowable jump distance, and the total jump time [T _JUMP ] in this case is
(1) 1/10 stroke jump in the same layer T _JUMP = 650 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 670ms
(2) 40000 sector interlayer jump T _JUMP = 330 (T _ACC ) +330 (T _IL ) +20 (T _OH )
= 710ms
The maximum jump time is 710 ms.

At this time, the required buffer size [S _RB ] is
SRB = 4.15 Mbyte, and
The data allocation condition (minimum continuous data allocation size) corresponding to each value of the data recording rate (R _TS ) is
R _MAX = 5 × 192 / 188Mbps → Continuous data allocation size [Usize] = 0.5Mbyte
R _MAX = 10 × 192/188 Mbps → Continuous data allocation size [Usize] = 1.1 Mbyte
R _MAX = 20 × 192 / 188Mbps → Continuous data allocation size [Usize] = 2.8 Mbyte
R _MAX = 30 × 192 / 188Mbps → Continuous data allocation size [Usize] = 6.0 Mbyte
R _MAX = 40 × 192/188 Mbps → Continuous data allocation size [Usize] = 14.2 Mbyte
R _MAX = 48 × 192/188 Mbps → Continuous data allocation size [Usize] = 45.1 Mbyte
It becomes.

  As described above, as the jump time decreases from (A1) → (A2) → (A3), both the buffer size and the minimum value of the continuous data arrangement size can be reduced. The small buffer size is effective in reducing the price of the playback device. The fact that the minimum value of the continuous data arrangement size is small has the effect that seamless connection is possible with a small arrangement unit and a small reproduction unit even with an AV stream of the same rate, and the degree of freedom in editing is increased.

  Next, data arrangement in a browsable slide show in which still images are sequentially switched and output and audio data is reproduced and output will be described. In the browsable slide show, as described above with reference to FIG. 1, data playback is performed by alternately jumping between clip data of an image data clip storing image data and an audio data clip storing audio data. It will be necessary.

The playback operation of the browsable slide show is, for example,
(A) When there is no user operation, the reproduction process of audio (sound) data is continued while displaying a still image.
(B) When the user performs an operation for displaying the next still image, after reading the data for one still image of MainTS, the state returns to the state of continuing to read AudioTS. The next still image is displayed on the screen, and the audio playback process is continued.
This is executed by the processes (a) and (b).

  For example, as shown in FIG. 16, in a configuration in which a disk 702 is mounted on a spindle motor 701, a main TS 703 storing image data for generating a still image and an audio TS 704 storing audio data are stored. In this case, data reproduction, that is, a browsable slide show is performed while alternately jumping between the storage area of the main TS 703 and the storage area of the audio TS 704.

  That is, a sufficient amount of audio data may be stored in advance in the audio data storage buffer so that the reproduction of the audio data can be continued during [jump → data reading for one still image → jump]. is necessary.

  The example shown in FIG. 16 is an example in which each of the main TS and the audio TS is recorded on a disk of the same layer as a configuration that can be read alternately by intra-layer jump. As described above, the main TS and the audio TS recorded separately on the same layer disc are alternately read as follows.

(1) A predetermined data amount x is read from the main TS.
(2) Jump to a predetermined data position of the audio TS.
(3) A predetermined data amount y is read from the audio TS.
(4) Jump to a predetermined data position of the main TS. Then, a predetermined data amount x is read from the main TS.

As described above, the data amount x read from the main TS by one read action is the minimum value of the size RB1 of the main TS read buffer 333 (see FIGS. 4 and 6). The data amount y read from the audio TS by one read action is the minimum value of the size RB2 of the audio TS read buffer 334. A size calculation formula required for the main TS read buffer 333 and the audio TS read buffer 334 is expressed by the following formula (Formula 1).
... (Formula 1)
However,
RB1: Size required for the main TS read buffer 333> = Data amount to be read from the main TS by one read action RB2: Size required for the audio TS read buffer 334> = In one read action from the audio TS Data amount to be read T _JUMP : Jump time R _UD : _Read bit rate from drive R _MAX1 : Bit rate of source packet stream of main TS (maximum read bit rate)
R _MAX2 : Bit rate of audio TS source packet stream (maximum read bit rate)
It is.

For example, the following conditions:
Read rate from drive: R _UD = 54 Mbps
Jump time: T _JUMP = 1.01 seconds Bit rate of main TS source packet stream: R _MAX1 = 15 Mbps
Bit rate of a source packet stream of audio _TS: R MAX2 = 2.0Mbps
Then,
Size required for the main TS read buffer 333: x = 3.90 MBytes
Size required for the audio TS read buffer 34: y = 0.698 MBytes
It becomes.

Of the above parameters,
R _UD: reading from the drive bit rate R _MAX1: bit rate of the source packet stream of the main TS R _MAX2: bit rate of the source packet stream of audio TS is basically the drive device, the reproduction processing of the processing power, data packet It is a value determined according to the amount,
T _JUMP : Jump time is a value that varies depending on the jump distance executed on the disk. In the above example, an assumed example is shown in which the jump time: T _JUMP = 1.01 seconds, but this is a temporary setting of one jump processing value, and the jump time: T _JUMP is on the disc. It differs depending on the jump distance to be executed.

When the jump time [T _JUMP ] becomes long due to the jump distance to be executed on the disk or the like, the buffer data amount based on the above calculation becomes insufficient, and there is a possibility that data reproduction is interrupted. Therefore, it is necessary to specify the data arrangement so that the jump time [T _JUMP ] is less than a certain time, and to perform data recording according to the specified format. Seamless playback is possible without causing any problems.

  With reference to FIG. 17, a setting example for guaranteeing a browsable slide show reproduction without data interruption will be described. When defining the data recording rules for the disc, an allowable jump mode, that is, a jump range that can prevent data interruption, is determined, and content recording is performed in such a manner that only the determined jump range occurs. It will be necessary.

FIG. 17 shows an example of allowable jump mode setting and a calculation example of the total jump time [T _JUMP ] in the jump processing. As described above, the total jump time is
Time equivalent to pickup movement (seek) time [T _ACC ]
Pickup adjustment time when performing interlayer jump [T _IL ]
Overhead time due to ECC block processing [T _OH ]
The sum of
T _JUMP = T _ACC + T _IL + T _OH
Is calculated as

  In the example shown in FIG. 17, the jump between layers in the browsable slide show is prohibited, and the main TS as the image data and the audio TS as the audio data are recorded on the same layer disk as a configuration in which the alternate reading by the jump in the layer is possible. This is an example.

The example of FIG. 17 (B1) is an example in which a full stroke interlayer jump from the innermost circumference to the outermost circumference is permitted, and the total jump time [TJUMP] in this case is
T _JUMP = 1220 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 1240ms
It becomes.
Note that the time [T _ACC ] corresponding to the pickup movement (seek) time, the adjustment time [T _IL ] of the pickup, and the overhead time [T _OH ] resulting from the ECC block processing are described with reference to FIG. Based on the example described.

  If the arrangement condition of the recording data with respect to the disc is determined based on this case, continuous supply of data can be guaranteed even if a jump is made between arbitrary addresses in the recording medium. However, since the jump time is set larger than (B2) and (B3), which will be described later, as described with reference to FIG. 18, it is necessary to guarantee continuous supply of data. The buffer size increases.

The example of FIG. 17 (B2) is an example in which a half stroke same-layer jump is set as the maximum allowable jump distance, and the total jump time [T _JUMP ] in this case is
T _JUMP = 990 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 1010ms
Thus, the maximum jump time is 1010 ms.

  In this model, it is necessary to determine the data arrangement condition by limiting the jump distance so that the maximum jump time is 1010 ms or less in the intra-layer jump, but as shown in FIG. 18, continuous data supply is guaranteed. The buffer size necessary for this is smaller than the model (B1).

The example of FIG. 17 (B3) is an example in which a 1/3 stroke jump in the same layer is set as the maximum allowable jump distance, and the total jump time [T _JUMP ] in this case is
T _JUMP = 880 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 900ms
Thus, the maximum jump time is 900 ms.

  In this model, it is necessary to determine the data arrangement condition by limiting the jump distance so that the maximum jump time is 900 ms or less in the intra-layer jump, but as shown in FIG. 18, continuous data supply is guaranteed. The buffer size necessary for this is smaller than the models (B1) and (B2).

18 permits each of the plurality of jump models (B1) to (B3) described with reference to FIG. 17 and the full stroke interlayer jump (FIG. 13 (A1)) described above with reference to FIG. In each case, according to the mathematical formula (Formula 1) described above in each case, the necessary buffer amount, that is,
RB1: Size required for the main TS read buffer 333> = Data amount to be read from the main TS by one read action RB2: Size required for the audio TS read buffer 334> = In one read action from the audio TS The amount of data to be read is calculated, and the calculated buffer amount is shown.

However,
R _MAX1: bit rate of the source packet stream of the main TS R _MAX2: the bit rate of the source packet stream of audio TS is
R _MAX1 = (192/188) × 15 Mbps
R _MAX2 = (192/188) × 2.0Mbps
It is a calculation assuming that.

  In the above formula, (192/188) takes into account the amount of header information in each TS.

(A1) is a case where a full-stroke interlayer jump from the innermost circumference of the first layer to the outermost circumference of the second layer is allowed. The total jump time [T _JUMP ] in this case is shown in FIG. As explained,
T _JUMP = 1220 (T _ACC ) +360 (T _IL ) +20 (T _OH )
= 1600 ms.

At this time, each required buffer size is
Minimum size (RB1) required for the main TS read buffer 333: x = 6.17 Mbytes
Minimum size required for read buffer 334 for audio TS (RB2): y = 1105 Kbytes
And
Total buffer size (RB1 + RB2) = 7.28 Mbyte
It becomes.

The example of (B1) is an example in the case where the full stroke same-layer jump is set as the maximum allowable jump distance, and the total jump time [TJUMP] in this case is
T _JUMP = 1220 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 1240ms
The maximum jump time is 1240 ms.

At this time, the required buffer size is
Minimum size (RB1) required for the main TS read buffer 333: x = 4.79 Mbytes
Minimum size required for read buffer 334 for audio TS (RB2): y = 857 Kbytes
And
Total buffer size (RB1 + RB2) = 5.64 Mbyte
It becomes.

The example of (B2) is an example in which the half-stroke same layer jump is set as the maximum allowable jump distance, and the total jump time [T _JUMP ] in this case is
T _JUMP = 990 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 1010ms
The maximum jump time is 1010 ms.

At this time, the required buffer size is
Minimum size (RB1) required for the main TS read buffer 333: x = 3.90 Mbytes
Minimum size (RB2) required for the audio TS read buffer 334: y = 698 Kbytes
And
Total buffer size (RB1 + RB2) = 4.60 Mbyte
It becomes.

The example of (B3) is an example in which a 1/3 stroke jump in the same layer is set as the maximum allowable jump distance, and the total jump time [T _JUMP ] in this case is
T _JUMP = 880 (T _ACC ) +0 (T _IL ) +20 (T _OH )
= 900ms
The maximum jump time is 900 ms.

At this time, the required buffer size is
Minimum size (RB1) required for the main TS read buffer 333: x = 3.48 Mbytes
Minimum size (RB2) required for the audio TS read buffer 334: y = 622 Kbytes
And
Total buffer size (RB1 + RB2) = 4.10 Mbyte
It becomes.

  Thus, the minimum value of the buffer size can be reduced as the jump time decreases from (A1) → (B1) → (B2) → (B3). The small buffer size is effective in reducing the price of the playback device.

As can be understood from FIG. 15 and FIG. 18 showing the buffer size required in each pattern of interlayer jump and intra-layer jump, it is defined as a playback application of BD-ROM.
Seamless connection between clips (connection_condition = 5)
By using a different jump model in each of the browsable slide shows, the buffer size required for the BD-ROM playback system can be reduced.

  For example, the model shown in FIG. 15A3 is applied to seamless connection between clips, and the model shown in FIG. 18B2 is applied to a browsable slide show (AudioTS TS_recording_rate = 2.0 Mbps, MainTS TS_recording_rate = 15 Mbps) By doing so, the buffer size required for the BD-ROM playback system can be set to 4.60 Mbytes.

  FIG. 19 shows a clip corresponding to the main TS (image data) for executing a necessary browsable slide show when the jump models (B1) to (B3) described with reference to FIG. 18 are employed. 1 and a data arrangement condition of clip # 2 corresponding to audio TS (audio data).

As described in the browserable slide show playback model, during playback of AudioTS, a process of [jump → read data for one still image → jump] occurs from an arbitrary location. Therefore, MainTS and AudioTS each need to be arranged in a continuous area, and the entire area where MainTS and AudioTS are arranged is the maximum jump distance corresponding to the cases (B1) to (B3) (D _{MAX in the} figure). Need to be inside.

  A clip # 1 shown in FIGS. 19A and 19C corresponds to the image data clip included in the content data file clip described above with reference to FIG. 1, and the clip # 2 is an audio data clip. Correspond. In the browsable slide show, the clip # 1 and the clip # 2 are alternately read and a reproduction process is executed.

  The playlist # 1 has a program configuration shown in FIG. 19B, for example, and has a configuration in which a sequence of clips to be played back is set. For example, playback based on the playlist # 1 shown in FIG. 19B is executed. In this case, content reproduction of clip # 1 is executed and clip # 2 is reproduced continuously. At this time, if clip # 1 to clip # 2 are not stored in the continuous area of the disc, jump processing occurs.

  When jump processing is executed, it is necessary to divide each clip data and record data so that the jump distance is set to be less than the maximum allowable jump distance.

  In each of the jump models (B1) to (B3) described with reference to FIG. 18, between the clips in the execution of the browsable slide show to which a plurality of clips # 1 and clips # 2 shown in FIG. The data arrangement conditions for guaranteeing seamless reproduction when a jump occurs is set as shown in FIG.

In order to guarantee seamless playback in playback of a browsable slide show, the entire area where MainTS and AudioTS are arranged is within the maximum jump distance (D _{MAX in the} figure) corresponding to cases (B1) to (B3). Must be in. Therefore, the data arrangement conditions for seamless playback of the browsable slideshow are:
(1) Size of MainTS (S _MAIN ) + Size of AudioTS (S _SUB ) ≦ D _MAX
and,
(2) Maximum jump distance: It is necessary to satisfy two conditions that all data of MainTS and AudioTS are continuously arranged within the range of D _MAX .

[4. Content recording / playback process]
Next, the configuration of a data processing apparatus that performs the above-described data processing will be described with reference to FIG. The data processing apparatus according to the present invention records information of recorded data including an image data clip storing image data and an audio data clip storing audio data, which is applied to a browsable slideshow that performs audio playback processing in conjunction with still image continuous playback. A data processing apparatus for determining an arrangement configuration with respect to a medium, including jump allowable range determining means 751, jump required time calculating means 752, buffer size determining means 753, data arrangement determining means 754, and data recording means 755, and an information recording medium Data writing to 756 is performed.

  The jump allowable range determining means 751 executes a process for determining the allowable range of the jump in the same layer and the interlayer jump executed in the reproduction process of the information recording medium. For example, processing for setting one of the jump models described with reference to FIGS. 13 and 17 is performed.

  The required jump time calculation means 752 calculates the required time required for the jump in the same layer and the jump between layers based on the jump allowable range information determined by the jump allowable range determination means 751.

  The jump required time calculation means 752 calculates the added value of the seek time of the pickup and the overhead time associated with the processing of the read data unit block of the information recording medium as the jump required time for the jump in the same layer. An addition value of the seek time of the pickup, the pickup adjustment time accompanying the interlayer movement, and the overhead time accompanying the processing of the read data unit block of the information recording medium is calculated as the required jump time.

  The buffer size determining means 753 is based on the jump required time calculated by the jump required time calculating means 752 and the size of the image data buffer for storing the image data read from the information recording medium and the audio data buffer for storing the audio data. Determine the size. In this determination, a calculation process using the previously described formula (Formula 1) is performed.

The data arrangement determining unit 754 determines the data arrangement so that the image data clip and the audio data clip to be applied to the browseable slide show are recorded within the jump allowable range calculated by the jump allowable range determining unit 751. Specifically, as described above with reference to FIG. 19, the data size S _MAIN of the image data clip and the data size S _SUB of the audio data clip to be applied to the browsable slide show are calculated, and the jump allowable range is calculated. When the value of the jump allowable range calculated in the determination step is D _MAX , the following conditions (a), (b),
(A) S _MAIN + S _SUB ≦ D _MAX ,
(B) The image data clip and the audio data clip are continuously arranged in the area of size D _MAX ,
The data arrangement configuration of the setting that satisfies the above is determined.

  The data recording unit 755 executes data recording on the information recording medium 756 according to the data arrangement configuration determined by the data arrangement determining unit 754 described above.

  Next, the sequence of the data processing method of the present invention will be described with reference to FIG. The data processing of the present invention is an information recording medium for recording data including an image data clip storing image data and an audio data clip storing audio data, which is applied to a browsable slide show that performs audio playback processing in conjunction with still image continuous playback. Data processing for determining the arrangement configuration for

  First, in step S101, a jump allowable range to be executed in the information recording medium reproduction process is determined. For example, processing for setting one of the jump models described with reference to FIG. 13 or FIG. 17 is performed.

  Next, in step S102, the required jump time is calculated. Based on the jump allowable range determination information determined in step S101, the time required for the same layer jump and interlayer jump is calculated.

  Specifically, for jumps in the same layer, the addition value of the seek time of the pickup and the overhead time associated with the processing of the read data unit block of the information recording medium is calculated as the required jump time. An added value of the time, the pickup adjustment time associated with the interlayer movement, and the overhead time associated with the processing of the read data unit block of the information recording medium is calculated as the required jump time.

  In step S103, the size of the image data buffer for storing the image data read from the information recording medium and the size of the audio data buffer for storing the audio data are determined based on the required jump time calculated in step S102. In this determination, a calculation process using the previously described formula (Formula 1) is performed.

  In step S104, the data arrangement is determined so that the image data clip and audio data clip applied to the browsable slide show stored in the information recording medium are set within the jump allowable range calculated in the jump allowable range determining step of step S101.

Specifically, as described above with reference to FIG. 19, the data size S _MAIN of the image data clip and the data size S _SUB of the audio data clip to be applied to the browsable slide show are calculated, and the jump allowable range is calculated. When the value of the jump allowable range calculated in the determination step is D _MAX ,
S _MAIN + S _SUB <D _MAX
The data arrangement configuration of the setting that satisfies the above is determined.

  In step S105, data recording on the information recording medium is executed according to the data arrangement configuration determined in the data arrangement determination step of step S104.

  In the reproduction of the content stored in the information recording medium by the above processing, seamless continuous reproduction is possible without causing data interruption even if a jump occurs. In particular, during continuous jump playback during playback of a browsable slide show that performs audio playback processing in conjunction with still image continuous playback, seamless continuous playback is possible without causing data interruption.

[5. Configuration that allows flexible setting of readout rate]
Above [2. Browserable slide show], [3. Jump processing and content storage format], [4. In the description of the “content recording / playback process”, the configuration for surely executing the playback process without interruption when the jump process occurs in the browsable slideshow that plays back still images together with sound has been described. In the processing example described above, the reading of the audio TS (reproduction) rate [R _TS2], a process example of a combination of essentially fixed value and a main (image) TS read (reproduction) rate [R _TS1] explained. Below, the structure which enabled the flexible setting of these read-out rates [ _RTS1 ] and [ _RTS2 ] is _demonstrated .

  In the browsable slide show, as described above, it is necessary to perform data reproduction by alternately jumping between clip data of an image data clip storing image data and an audio data clip storing audio data.

The playback operation of the browsable slide show is, for example,
(A) When there is no user operation, the reproduction process of audio (sound) data is continued while displaying a still image.
(B) When the user performs an operation for displaying the next still image, after reading the data for one still image of the main TS, the state returns to the state of continuing to read the audio TS. The next still image is displayed on the screen, and the sound (audio) reproduction process is continued.
This is executed by the processes (a) and (b).

  For example, as described above with reference to FIG. 16, in the configuration in which the disc 702 is mounted on the spindle motor 701, the main TS 703 storing image data for generating a still image and the audio storing audio data. When the TS 704 is stored, data reproduction, that is, a browsable slide show is performed while alternately jumping between the storage area of the main TS 703 and the storage area of the audio TS 704.

That is, a sufficient amount of audio data may be stored in advance in the audio data storage buffer so that the reproduction of the audio data can be continued during [jump → data reading for one still image → jump]. is necessary. The processing sequence in the programmable slide show is the following sequence.
(1) A predetermined data amount x is read from the main TS.
(2) Jump to a predetermined data position of the audio TS.
(3) A predetermined data amount y is read from the audio TS.
(4) Jump to a predetermined data position of the main TS. Then, a predetermined data amount x is read from the main TS.

As described above, the data amount x read from the main TS by one read action is the minimum value of the size RB1 of the main TS read buffer 333 (see FIGS. 4 and 6). The data amount y read from the audio TS by one read action is the minimum value of the size RB2 of the audio TS read buffer 334. In the embodiment described above, the size calculation formulas required for the main TS read buffer 333 and the audio TS read buffer 334 are expressed by the following formula (Formula 2).
... (Formula 2)

However,
RB1: Size required for the main TS read buffer 333> = Data amount to be read from the main TS by one read action RB2: Size required for the audio TS read buffer 334> = In one read action from the audio TS Data amount to be read T _JUMP : Jump time R _UD : _Read bit rate from drive R _MAX1 : Bit rate of source packet stream of main TS (maximum read bit rate)
R _MAX2 : Bit rate of audio TS source packet stream (maximum read bit rate)
It is.
The above formula (Formula 2) is the same as the above formula (Formula 1).

_The relationship between R _{MAX1, R MAX2} and _{R TS1, R TS2} is as follows.
R _MAX1 = R _TS1 × (192/188)
R _MAX2 = R _TS2 × (192/188)
R _MAX1, the relationship between _{R MAX2} and _{R TS1, R TS2} will be described in detail.
As described above with reference to FIGS. 4 and 5, the main (image data) player (BDAV MPEG2 TS Player_1) 335 included in the player model shown in FIG. 4 is read from the main TS read buffer 333 in the preceding stage. The read source packet data is input at the bit rate R _MAX1 . R _MAX1 is the bit rate of the source packet stream of the main TS file.

The source _depacketizer 371 (see FIG. 5) of the main (image data) player 335 performs depacketization processing on the source packet based on the count value of the arrival time clock counter 372, which is input at the bit rate R _MAX1. The processing data is output from the source depacketizer unit 371 at the bit rate R _TS1 .

That is, the source packet stream of the main TS file is _input to the main (image data) player (BDAV MPEG2 TS Player_1) 335 at a bit rate _MAX1 from the main TS read buffer 333 shown in FIG. Here, the depacketizing process is executed, and is output as the 188-byte base data from the main (image data) player 335 shown in FIG. 4 at the bit rate R _TS1 .

The same applies to the audio TS file constituting the audio data, as the source packet stream 192 byte based data, audio player at the bit rate _MAX2 from the audio TS read buffer 334 shown in FIG. 4 (BDAV MPEG2 TS Player Model_2) is input to 336, where, by depacketizing process is performed, as 188-byte based data is output at the bit rate _{R TS2.
Therefore,} the relationship R _{MAX1, R MAX2} and _{R TS1, R TS2} is as follows.
R _MAX1 = R _TS1 × (192/188)
R _MAX2 = R _TS2 × (192/188)

In the above (Formula 2), various conditions are set, that is,
Read rate from drive: R _UD = 54 Mbps
Jump time: T _JUMP = 1.01 seconds Bit rate of source packet stream of main TS: R _TS1 = 15 Mbps
Bit rate of source packet stream of audio TS: R _TS2 = 2.0 Mbps
If you set
Size required for the main TS read buffer 333: x = 3.90 MBytes
Size required for the audio TS read buffer 34: y = 0.698 MBytes
And the amount of buffer required for the playback apparatus can be determined.
In the above buffer amount determination process,
R _MAX1 = R _TS1 × (192/188)
R _MAX2 = R _TS2 × (192/188)
Is assumed.

Above (Equation ₂₎ have expressed using the R _{MAX1, R MAX2,} if one is determined by the relation to the _{R MAX1, R MAX2} and _{R TS1, R TS2,} as described above, other a relationship but to _determine, [R _TS1], set the _{[R TS2], or,} [R _MAX1], based on one set of _{[R MAX2],} it is possible to determine the processing of the buffer volume .

As described above, in the buffer size determination process to which the above-described formula (Formula 2) is applied, the image and audio data read rates are fixed, that is,
Bit rate of a source packet stream of the main _TS: R TS1 = 15Mbps
Bit rate of source packet stream of audio TS: R _TS2 = 2.0 Mbps
The processing based on the assumption was performed.

However, depending on the content stored in the information recording medium, reproduction of higher quality audio data may be required. For example, when reproducing high-quality audio data such as multi-channel surround data that requires 6-channel or 8-channel audio data, or LPCM data as uncompressed data, the readout (reproduction) rate of the audio TS is: The above-mentioned R _TS2 = 2.0 Mbps is insufficient, and it is necessary to perform reproduction at a reading rate of 10 to 30 Mbps.

  In the above-described processing example, the processing for calculating the buffer size necessary for performing uninterrupted playback in the browseable slide show playback with jump processing with the image and audio data read rate fixed is described. A configuration will be described in which the total buffer amount (RB1 + RB2) of the apparatus is fixed, the audio data read rate can be changed, and high-quality audio data reproduction is possible. The configuration described below is a configuration in which not only the audio data read rate but also the main TS, that is, the image data read rate can be changed.

When the above formula (Formula 2) is rewritten by applying the total buffer amount (RB1 + RB2), the following formula (Formula 3) is set.
... (Formula 3)

As understood from the above formula (formula 3), even when the total buffer amount (RB1 + RB2) is fixed, the maximum read rate of image data included in the recording data satisfying the above formula (formula 3): R _MAX1 ,
Maximum read rate of audio data included in recorded data: R _MAX2 ,
There are many combinations of.

The (Equation ₃₎ have been represented using the R _{MAX1, R MAX2,} and _{R MAX1, R MAX2} and _{R TS1, R TS2} as described above, the relational expression, i.e.,
R _MAX1 = R _TS1 × (192/188)
R _MAX2 = R _TS2 × (192/188)
If one is determined by the above, the relationship is determined by the other. As can be understood from the above equation (Equation 3), even when the total buffer amount (RB1 + RB2) is fixed, the above equation (Equation 3). satisfying _{[R MAX1],} there are many combination of _{[R MAX2],} therefore, the equation reads audio TS which satisfies the (equation 3) (reproduced) rate _{[R TS2],} the main (image) of the TS There are many combinations with the read (reproduction) rate [R _TS1 ].

The above equation and reading of the audio TS which satisfies the (Equation 3) (reproduced) Rate _{[R TS2],} by applying a combination of the main (image) TS read (reproduction) rate _{[R TS1],} in the reproducing apparatus It is possible to execute a playable slideshow without interruption.

A specific example of the setting process of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] will be described below. Hereinafter, two processing examples (A) and (B) will be sequentially described.

(1) Processing example A
A processing example A will be described with reference to FIG. In the processing example A, the above formula (formula 3) is directly applied to calculate a combination of the image data read rate [R _TS1 ] and the audio data read rate [R _TS2 ] satisfying the formula 3. It is. FIG. 22A shows a graph of the relationship between the rates satisfying Equation 3.
The horizontal axis represents the image data read rate [R _TS1 ] Mbps,
The vertical axis represents the audio data read rate [R _TS2 ] Mbps,
It is.

FIG. 22 (b)
The horizontal axis represents the image data read rate [R _TS1 ] Mbps,
Total buffer amount [RB1 + RB2] MB on the vertical axis
Is shown. In this example process:
Total buffer amount [RB1 + RB2] MB = 6.05MB
It was set as a fixed value.

When the total buffer amount [RB1 + RB2] MB = 6.05 MB, the combination of the image data read rate [R _TS1 ] Mbps and the audio data read rate [R _TS2 ] Mbps satisfying Equation 3 is shown in the graph of FIG. There are many points on the curve 761.

An example of selecting a specific combination from these many combinations will be described. For example, assume that 8-channel LPCM playback is performed as multi-channel surround playback. Each channel is composed of 96 kHz, 24 bit data.
In this case, the amount of data necessary for reproduction, that is, the read rate is
96kHz × 24bit × 8ch = 18.432Mbps
If the audio data read rate [R _TS2 ] is set to about 20 Mbps, 8-channel LPCM playback is possible.

In this way, first, the required audio data read rate [R _TS2 ] = about 20 Mbps is obtained, and R _TS2 = about 20 Mbps is substituted into Equation 3 above, and the image data read rate [R _TS1 that satisfies Equation 3 is satisfied. ] Can be calculated. This corresponds to processing for _obtaining the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] corresponding to the point 762 on the curve 761 in the graph shown in FIG. As is apparent from the figure, when the required audio data read rate [R _TS2 ] is smaller than 20 Mbps, the image data read rate [from the combinations corresponding to the points on the curve 761 of the graph shown in FIG. By selecting a combination that increases R _TS1 ], it is possible to shorten the time for reading image data during playback of the browsable slide show.

However, for each data included in Equation 3, the following assumptions are made:
Total buffer amount [RB1 + RB2] MB = 6.05MB
Read rate from drive: R _UD = 54 Mbps
The jump time is assumed to be T _JUMP = 1.01 seconds.

These values, that is, the total buffer amount [RB1 + RB2] and the read rate from the drive: R _UD are determined by the function of the playback device, and the jump time is the image of the function recorded on the playback device and the information recording medium. It is a value determined by the separation distance between data and audio data. The jump time varies depending on the recording mode of the content recorded on the information recording medium, and a value corresponding to the recording mode is applied.

Further, it is assumed that 6-channel LPCM playback is performed as multi-channel surround playback. Each channel is composed of 192 kHz, 24 bit data.
In this case, the amount of data necessary for reproduction, that is, the read rate is
192kHz × 24bit × 6ch = 27.648Mbps
If the audio data read rate [R _TS2 ] is set to about 30 Mbps, 6-channel LPCM reproduction in which each channel is composed of 192 kHz and 24-bit data is possible.

In this way, first, the required audio data read rate [R _TS2 ] is calculated, and based on the function of the playback device that executes the playback process, the total buffer amount [RB1 + RB2] and the read rate from the drive: R _UD Further, each of these data is obtained, and further, for example, the jump time: T _JUMP = is set, and for example, the time required for the jump of full stroke, half stroke, and 1/3 stroke is obtained. It is possible to calculate the audio data reading rate [R _TS2 ] and the image data reading rate [R _TS1 ] that satisfy the equation (Equation 3), and recording data that satisfies this condition on the information recording medium is interrupted. Playback of a browsable slideshow that does not occur is guaranteed.

(2) Processing example B
A processing example B will be described with reference to FIG. The processing example B does not directly apply the above equation (Equation 3), but enables simplified processing. Therefore, the processing example B includes the image data reading rate [R _TS1 ] and the audio data reading rate [R _TS2 ]. A conditional expression that the total rate value as a sum is not more than a certain value [X], that is,
R _TS1 + R _TS2 = X (Formula 4)
, And a combination of the image data readout rate [R _TS1 ] and the audio data readout rate [R _TS2 ] is calculated based on the conditional expression (Equation 4).

By applying the above formula (Formula 4), the condition can be defined by a simpler formula than Formula 3. In the above formula (Formula 4), when the total rate value [X] is smaller than the read bit rate R _UD from the drive, in the combination of [R _TS1 ] [R _TS2 ] allowed under the condition of Formula (Formula 4) The value of the total buffer size (RB1 + RB2) does not change greatly. An effect equivalent to the condition of the formula (Formula 3) in which the actual buffer size is fixed can be expected.

With reference to FIG. 24, the process to which Formula 4 is applied is demonstrated. FIG. 24A shows a graph of the relationship between the rates satisfying Equation 4.
The horizontal axis represents the image data read rate [R _TS1 ] Mbps,
Vertical axis, the audio data readout rate _[R TS2] Mbps,
It is. In this example, the total rate value [X] = 22 Mbps is set. That is,
R _TS1 + R _TS2 = 22
It is.

FIG. 24 (b)
The horizontal axis represents the image data read rate [R _TS1 ] Mbps,
Total buffer amount [RB1 + RB2] MB on the vertical axis
Is shown. In this example process:
The total buffer amount [RB1 + RB2] MB varies between 6.05 and 7.34 so as to satisfy Equation 3 under the condition of R _TS1 + R _TS2 = 22.

A combination of the image data reading rate [R _TS1 ] Mbps and the audio data reading rate [R _TS2 ] Mbps satisfying the above formula (Formula 4) is a point on the straight line 764 in the graph of FIG. To do.

The process of selecting a specific combination from these many combinations is executed as the same process as in process example A described above. However, the applied mathematical formula is not the mathematical formula 3, but the mathematical formula 4, and a combination of the image data reading rate [R _TS1 ] Mbps and the audio data reading rate [R _TS2 ] Mbps can be easily obtained.

For example, assume that 8-channel LPCM playback is performed as multi-channel surround playback. Each channel is composed of 96 kHz, 24 bit data.
In this case, the amount of data necessary for reproduction, that is, the read rate is
96kHz × 24bit × 8ch = 18.432Mbps
If the audio data read rate [R _TS2 ] is set to about 20 Mbps, 8-channel LPCM playback is possible.

In this way, first, the required audio data reading rate [R _TS2 ] = about 20 Mbps is obtained, and R _TS2 = about 20 Mbps is substituted into Equation 4 above, and the image data reading rate [R _TS1 that satisfies Equation 4 is satisfied. ] Can be calculated. This corresponds to processing for _obtaining the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] corresponding to the point 765 on the straight line 764 in the graph shown in FIG. As is apparent from the figure, when the required audio data read rate [R _TS2 ] is smaller than 20 Mbps, the image data read rate [from the combinations corresponding to the points on the curve 764 in the graph shown in FIG. By selecting a combination that increases R _TS1 ], it is possible to shorten the time for reading image data during playback of the browsable slide show.

Also in the processing example B, as in the processing example A, first, the required audio data read rate [R _TS2 ] is calculated, and based on the function of the playback device that executes the playback processing, the total buffer amount [RB1 + RB2] and the drive Read rate from: R _UD , each of these data is acquired, and further, as jump time: T _JUMP =, for example, the time required for a jump of full stroke, half stroke, and 1/3 stroke is obtained, Based on each value, it is possible to calculate the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] that satisfy the above equation (Equation 4), and the data that satisfies this condition can be calculated as an information recording medium. Recording in this way guarantees playback of a browsable slideshow without interruption.

The formula applied in Processing Example B, that is,
R _TS1 + R _TS2 = X (Formula 4)
The total rate value [X]
(A) X = 17 Mbps,
(B) X = 22 Mbps,
(C) X = 32 Mbps,
When set as
The combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] satisfying the above equation (Equation 4), and the allowable jump distance are the full stroke, half stroke, and 1/3 stroke jump distances. FIG. 26 to FIG. 28 show tables (reading rate setting tables) showing the correspondence data of the total buffer size (RB1 + RB2) required for the playback apparatus in this case.

The table applies a combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ], the maximum read rate [R _MAX1 ] of the image data included in the recording data, and the audio included in the recording data. Although it is not a configuration using a combination of the maximum data read rate [R _MAX2 ], this is because the [R _TS1 ] [R _TS2 ] is the MPEG-TS (transport stream) rate itself, and image and audio data This is because it is easy to directly reflect the rate limit.

FIG. 26 is a read rate setting table based on a setting example of R _TS1 + R _TS2 = 17 Mbps, and the audio data read bit rate [R _TS2 ] is in the range of ₂ to 15 Mbps.
R _TS1 + R _TS2 = 17 Mbps
When the combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] satisfying the above conditions and the allowable jump distance is set to each of the full stroke, half stroke, and 1/3 stroke jump distances, the reproduction apparatus is required. Shows the total buffer size (RB1 + RB2).

For example,
When the audio data read rate [R _TS2 ] = 15 Mbps,
The image data read rate [R _TS1 ] is 2 Mbps. In this case, in a configuration that allows a full stroke jump, the total buffer size (RB1 + RB2) required for the playback device is 5.64 MB, and a half stroke jump is performed. In the configuration that allows the playback device, the total buffer size (RB1 + RB2) required for the playback device is 4.59 MB, and in the configuration that allows a 1/3 stroke jump, the total buffer size (RB1 + RB2) required for the playback device is 4.09 MB. Less than,
Audio data read rate [R _TS2 ] = 15-2 Mbps,
Image data read rate [R _TS1 ] = 2-15 Mbps,
The total buffer size (RB1 + RB2) of the playback device required when each jump distance is set as the maximum jump distance in each of the combinations is obtained.

  If the total buffer size (RB1 + RB2) of the playback device is determined in advance, the maximum allowable jump distance when executing content recording corresponding to the browsable slideshow on the information recording medium is determined based on this table data. It can also be determined.

For example, when the total buffer size (RB1 + RB2) of the playback device is 5.00 MB, the data area in which the total buffer size (RB1 + RB2) is 5.00 or less from the data shown in FIG. 26, ie, FIG. If the data area 767 shown in FIG. 5 is set, it is possible to perform a browsable slideshow playback without interruption in the playback device. That is, when 1/3 stroke is set as the maximum jump distance,
Audio data read rate [R _TS2 ] = 15-2 Mbps,
Image data read rate [R _TS1 ] = 2-15 Mbps,
All combinations of are allowed.

Also, if you set half stroke as the maximum jump distance,
Audio data read rate [R _TS2 ] = 15-12 Mbps,
Image data read rate [R _TS1 ] = 2 to 5 Mbps,
A combination of
Audio data read rate [R _TS2 ] = 5-2 Mbps,
Image data read rate [R _TS1 ] = 12-15 Mbps,
Only combinations of are allowed.

If you set the full stroke as the maximum jump distance,
Audio data read rate [R _TS2 ] = 15-2 Mbps,
Image data read rate [R _TS1 ] = 2-15 Mbps,
All combinations of would be unacceptable.

The entity that generates content and records data is based on the table data, and the content mode, that is, the setting of the audio data read rate [R _TS2 ], the image data read rate [R _TS1 ], and the jump at the time of data recording The distance can be set.

FIG. 27 is a read rate setting table based on a setting example of R _TS1 + R _TS2 = 22 Mbps, and the audio data read bit rate [R _TS2 ] is in the range of ₂ to 20 Mbps.
R _TS1 + R _TS2 = 22 Mbps
When the combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] satisfying the above conditions and the allowable jump distance is set to each of the full stroke, half stroke, and 1/3 stroke jump distances, the reproduction apparatus is required. Shows the total buffer size (RB1 + RB2).

In the combination shown in FIG. 27, for example, the uppermost data combination, that is,
Audio data read rate [R _TS2 ] = 20 Mbps,
Image data read rate [R _TS1 ] = 2 Mbps,
Is a combination that realizes reproduction of 8-channel surround audio data composed of 96 kHz, 24-bit data. The readout rate required to play this 8-channel surround audio data is
96kHz × 24bit × 8ch = 18.432Mbps
It is.

The combination of the uppermost audio data read rate [R _TS2 ] = 20 Mbps and the image data read rate [R _TS1 ] = 2 Mbps is the audio data read rate [R _TS2 ]> 18.432, which enables 8-channel LPCM playback. This is an example of setting.

In this setting, the total buffer size (RB1 + RB2) required for the playback device when the allowable jump distance is each of the jump distances of full stroke, half stroke, and 1/3 stroke,
Full stroke: 7.42MB
Half stroke: 6.05MB
1/3 stroke: 5.39MB
It becomes. If the total buffer amount is larger than these buffer sizes, it is possible to perform a browsable slide show playback without interruption of 8-channel surround audio data composed of 96 kHz, 24-bit data.

FIG. 28 is a read rate setting table based on a setting example of R _TS1 + R _TS2 = 32 Mbps, where the audio data read bit rate [R _TS2 ] is in the range of ₂ to 30 Mbps, and in this range, Formula 4
R _TS1 + R _TS2 = 32 Mbps
When the combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] satisfying the above conditions and the allowable jump distance is set to each of the full stroke, half stroke, and 1/3 stroke jump distances, the reproduction apparatus is required. Shows the total buffer size (RB1 + RB2).

In the combination shown in FIG. 28, for example, the uppermost combination of data, that is,
Audio data read rate [R _TS2 ] = 30 Mbps,
Image data read rate [R _TS1 ] = 2 Mbps,
Is a combination that realizes reproduction of 6-channel surround audio data composed of 192 kHz, 24-bit data. The readout rate required for playback of this 6-channel surround audio data is
192kHz × 24bit × 6ch = 27.648Mbps
It is.

The combination of the uppermost audio data read rate [R _TS2 ] = 30 Mbps and the image data read rate [R _TS1 ] = 2 Mbps is an audio data read rate [R _TS2 ]> 27.648, which enables 6-channel LPCM playback. This is an example of setting.

In this setting, the total buffer size (RB1 + RB2) required for the playback device when the allowable jump distance is each of the jump distances of full stroke, half stroke, and 1/3 stroke,
Full stroke: 11.40MB
Half stroke: 9.28MB
1/3 stroke: 8.27MB
It becomes. If the total buffer amount is larger than these buffer sizes, it is possible to perform a browsable slide show reproduction without interruption of 6-channel surround audio data composed of 192 kHz, 24-bit data.

  In addition, when processing example A, that is, Expression 3 is directly applied, a table similar to that shown in FIGS. 26 to 28, that is, a read rate setting table can be generated, and is necessary for the playback device based on the table. The total buffer size (RB1 + RB2) can be calculated, and the maximum allowable jump distance to be set at the time of content recording can be set. In both processing examples A and B, the total buffer size (RB1 + RB2) required for the playback apparatus is calculated by applying Formula 3 or Formula 4 without applying the table, and the maximum allowable jump to be set at the time of content recording It is also possible to set the distance.

The procedure for creating the read rate setting table will be described with reference to the flowchart shown in FIG. First, in step S301, the total buffer size (RB1 + RB2) = X is set. X is a numerical value defined between the upper limit and the lower limit of the total buffer size defined in advance. In step S302, it sets the numerical [Y] defined between the upper-limit of the audio data readout rate _{[R TS2]} predefined audio data readout rate the value of _{[R TS2].}

In step S303, an upper limit value [Z] of the settable image data read rate [R _TS1 ] is calculated for the audio data read rate [R _TS2 ] = Y. This calculation process is executed by applying Formula 3 in the above-described Process Example A and applying Formula 4 in the Process Example B.

Next, in step S304, it is determined whether processing for all data (for example, 2 to 20 Mbps) at a preset audio data reading rate [R _TS2 ] = Y has been completed. In S302, the audio data read rate [R _TS2 ] = Y is updated (for example, every 1 Mbps), and the process of step S303 is repeatedly executed.

If it is determined in step S304 that the processing has been completed for all data (for example, 2 to 20 Mbps) at a preset audio data read rate [R _TS2 ] = Y, the process proceeds to step S305, where the total buffer size (RB1 + RB2) = With respect to X, it is determined whether or not all values have been calculated within a numerical value range defined between the upper limit and the lower limit of the total buffer size defined in advance. If there are unprocessed numerical values, the process returns to step S301 to return to the total buffer size (RB1 + RB2). ) = X value is updated, and the process from step S302 is repeated.

Note that, for the values of the total buffer size (RB1 + RB2) = X and the audio data read rate [R _TS2 ] = Y, update processing may be executed by selecting only values necessary for calculation processing. Through the processing shown in this flow, the combination of total buffer size (RB1 + RB2) = X, audio data read rate [R _TS2 ] = Y, and image data read rate [R _TS1 ] = Z is determined. A read rate setting table is generated.

The read rate setting tables shown in FIGS. 26 to 28 have a data structure indicating the total buffer size (RB1 + RB2) when the maximum jump distance = full stroke, half stroke, and 1/3 stroke, respectively. 29, the jump time when different maximum jump distances are set: T _JUMP is calculated, the calculation result is substituted into Formula 3, and the total of the execution of the flow of FIG. Data corresponding to each maximum jump distance can be calculated by executing the process of determining the setting allowable range of the buffer size (RB1 + RB2) = X and the audio data read rate [R _TS2 ] = Y.

(3) Content Authoring and Content Recording Processing Next, content authoring and content recording processing when the processing example A and the processing example B described above are applied will be described.

First, FIG. 30 and FIG. 31 show processing example A, that is, two processing examples for calculating the image data reading rate [R _TS1 ] and the audio data reading rate [R _TS2 ] based on Equation 3 described above. This will be described with reference to a flowchart. The processing flow in FIG. 30 is a flow showing a processing procedure when the audio data reading rate [R _TS2 ] or the image data reading rate [R _TS1 ] is determined in advance, and the processing flow in FIG. It is a flow which shows the process sequence in case reading rate [ _RTS2 ] or image data reading rate [ _RTS1 ] is not determined.

First, content authoring and content recording processing when the audio data read rate [R _TS2 ] or the image data read rate [R _TS1 ] is determined in advance will be described with reference to FIG.

In step S311, the content material is determined. That is, it is the content to be recorded on the information recording medium. Note that the content here is content corresponding to a browsable slide show. In step S312, the total buffer size (RB1 + RB2) of the playback device is acquired. This total buffer size is assumed to be predetermined by the playback device. For example, the buffer size of each device is acquired from a table that records the total buffer size for each device. Specifically, as shown in the figure,
(1) Total buffer size of portable device = Ba (MB)
(2) Total buffer size of portable playback device (Player) = Bb (MB)
(3) Total buffer size of high-end equipment = Bc (MB)
It is assumed that the total buffer size (RB1 + RB2) of each device is determined as Ba, Bb, Bc, respectively.

Next, in step S313, a combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] is set. For example, when it is necessary to perform 8-channel LPCM reproduction as multi-channel surround reproduction in which each channel is composed of 96 kHz, 24-bit data, as described above, the audio data read rate [R _TS2 ] ≈about 20 Mbps is necessary. . In addition, when performing 6-channel LPCM playback composed of 192 kHz, 24-bit data, an audio data read rate [R _TS2 ] ≈about 30 Mbps is required. Similarly, a necessary reading rate corresponding to the authoring content is set for the reading rate [R _TS1 ] of the image data.

Next, in step S314, the combination data of the set audio data read rate [R _TS2 ] and image data read rate [R _TS1 ] and the total buffer size acquired in step S312 are input to the above-described equation (Equation 3), It is determined whether or not Expression 3 is satisfied. When Expression 3 is not satisfied (step S314: No), the process returns to step S313, and the necessary reading rate corresponding to the authoring content, that is, the audio data reading rate [R _TS2 ] and the image data reading rate [R _TS1 ]. Reset the combination.

This process is executed until a setting value that satisfies Expression 3 is obtained. When a setting value that finally satisfies Expression 3 is obtained (Step S314: Yes), the process proceeds to Step S315, and Expression 3 is satisfied. Content data having a combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] to be recorded on the information recording medium. The data recording process for the information recording medium includes a content encoding process, an MPEG multiplexing process, a data arrangement condition determining process, and the like.

When determining the data arrangement conditions, for example, it is necessary to record audio and image data after defining the maximum allowable jump distance (full stroke, half stroke, 1/3 stroke). The jump distance needs to be set to a jump distance that satisfies Expression 3 when Jump Time: T _JUMP is input to Expression 3.

  By recording the content in the information recording medium in this way, content recording satisfying Equation 3 is realized, and reproduction without causing data interruption is possible when browser playback slide show playback is performed on the playback device. It becomes.

Next, content authoring and content recording processing when the audio data read rate [R _TS2 ] or the image data read rate [R _TS1 ] is not determined will be described with reference to FIG.

In step S321, the content material is determined. In other words, the content corresponds to a browsable slide show to be recorded on the information recording medium. In step S322, the total buffer size (RB1 + RB2) of the playback device is acquired. This total buffer size is the same as in the previous processing example.
(1) Total buffer size of portable device = Ba (MB)
(2) Total buffer size of portable playback device (Player) = Bb (MB)
(3) Total buffer size of high-end equipment = Bc (MB)
As described above, the total buffer size (RB1 + RB2) of each device is executed as a process for acquiring determined data such as Ba, Bb, and Bc.

Next, in step S323, the combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] is set to Equation 3 or a read rate setting table that satisfies Equation 3, that is, the audio data read rate [R _TS2 ], image data read rate [R _TS1 ], and total buffer size (RB1 + RB2) are selected from the read rate setting table. For example, the combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] satisfying Equation 3 when the total buffer size (RB1 + RB2) = X is as shown in FIG.
Image data read rate [R _TS1 ] = 2 to 20
Audio data read rate [R _TS2 ] = 20-2
There are a large number of them, and a desired combination can be selected from these.

For example, when it is necessary to perform 8-channel LPCM playback as multi-channel surround playback in which each channel is composed of 96 kHz, 24-bit data, as described above, the audio data read rate [R _TS2 ] ≈about 20 Mbps is required. Therefore, it is possible to perform processing such as selecting a combination of the audio data read rate [R _TS2 ] = 20 Mbps and the image data read rate [R _TS1 ] = 2 Mbps.

Next, the process proceeds to step S324, and content data having a combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] satisfying Equation 3 set in step S323 is recorded on the information recording medium. The data recording process for the information recording medium includes a content encoding process, an MPEG multiplexing process, a data arrangement condition determining process, and the like. In determining the data arrangement conditions, for example, the maximum allowable jump distance (full stroke, half stroke, 1/3 stroke) is defined, and the sound and image are defined in the same manner as the flow described above with reference to FIG. It is necessary to record data.

Next, with reference to the flowchart shown in FIG. 32, based on the processing example B, that is, the above-described mathematical expression 4 “R _TS1 + R _TS2 ≦ X”, the image data read rate [R _TS1 ] and the audio data read rate [ Content authoring and content recording processing including processing for determining R _TS2 ] will be described.

In step S331, the content material is determined. In other words, the content corresponds to a browsable slide show to be recorded on the information recording medium. Next, in step S332, the maximum value [X] of the sum of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] is determined.

For example, when R _TS1 + R _TS2 = X = 17 Mbps, it corresponds to the read rate setting table of FIG. 26, and when R _TS1 + R _TS2 = X = 22 Mbps, it corresponds to the read rate setting table of FIG. When R _TS1 + R _TS2 = X = 32 Mbps, this corresponds to the read rate setting table of FIG.

In step S333, a combination of the audio data reading rate [R _TS2 ] and the image data reading rate [R _TS1 ] is determined based on the value of [X] determined in step S332. This determination is determined as a combination that satisfies Equation 4, and can be selected from, for example, any of the tables in FIGS. 26 to 28 according to the value of [X].

Next, the process proceeds to step S334, and content data having a combination of the audio data read rate [R _TS2 ] and the image data read rate [R _TS1 ] satisfying Equation 4 set in step S333 is recorded on the information recording medium. The data recording process for the information recording medium includes a content encoding process, an MPEG multiplexing process, a data arrangement condition determining process, and the like. In determining the data arrangement conditions, for example, the maximum allowable jump distance (full stroke, half stroke, 1/3 stroke) is the same as the flow corresponding to the processing example A described with reference to FIGS. It is necessary to record audio and image data after defining the above.

  By recording the content in the information recording medium in this way, content recording satisfying Equation 3 is realized, and reproduction without causing data interruption is possible when browser playback slide show playback is performed on the playback device. It becomes.

  Next, with reference to FIGS. 33 and 34, the functional configuration of a data processing apparatus that executes processing for determining the recording data configuration of image data and audio data applied to the above-described browserable slide show will be described.

  FIG. 33 shows a functional configuration of a data processing apparatus that executes the above-described processing example A, that is, processing for determining the readout rate of image data and audio data by applying Formula 3. As shown in FIG. 33, the data processing apparatus includes a buffer size setting unit 771, a table generation unit 772, a rate determination unit 773, and a data recording unit 774.

The buffer size setting unit 771 sets the total buffer size of the image data and audio data of the playback device that executes the browserable slide show playback processing as a fixed value. For example,
(1) Total buffer size of portable device = Ba (MB)
(2) Total buffer size of portable playback device (Player) = Bb (MB)
(3) Total buffer size of high-end equipment = Bc (MB)
As described above, the total buffer size (RB1 + RB2) information of the reproduction target device is acquired.

  The table generation unit 772 is a table that lists the correspondence between the combination of the read rate of the image data and the audio data that satisfies the above-described Expression 3 and the total buffer size of the playback device, for example, the data configuration shown in FIGS. A read rate setting table having is generated.

  The rate determining means 773 determines the read rate of image data and audio data based on the total buffer size of the playback device, the maximum jump time allowed for data playback, and each data of the data read rate of the playback device. . The rate determining unit 773 applies the rate setting table generated by the table generating unit 772 to determine the reading rate of the image data and the audio data, or sets the value satisfying the above-described Expression 3 without using a table. The readout rate of image data and audio data is determined.

  The data recording unit 774 executes processing for recording image data and audio data having a data mode corresponding to the read rate of the image data and audio data determined by the rate determining unit 773 on the information recording medium 775 or the information recording medium master. .

  FIG. 34 shows a functional configuration of the above-described processing example B, that is, a data processing apparatus that executes processing for determining the readout rate of image data and audio data by applying Formula 4. As shown in FIG. 34, the data processing apparatus includes rate total value setting means 781, table generation means 782, rate determination means 783, and data recording means 784.

  The total rate value setting unit 781 sets a total rate value X as a total value of the image data reading rate and the audio data reading rate applied to the browserable slide show.

  The table generation unit 782 satisfies the above-described formula 4, and further satisfies the formula 3, and a table listing correspondences between combinations of image data and audio data read rates and the total buffer size of the playback device, for example, FIG. A read rate setting table having the data configuration shown in FIG. 28 is generated.

The rate determining means 783 determines the image data read rate as R _TS1 and the audio data read rate as R _TS2 based on the table recording set according to Equation 4 or Equation 4. In making this decision,
The following formula,
R _TS1 + R _TS2 <= X
The process of determining the image data read rate R _TS1 and the audio data read rate R _TS2 satisfying the above is executed.

  The data recording unit 784 executes a process of recording image data and audio data having a data mode corresponding to the read rate of the image data and audio data determined by the rate determining unit 783 on the information recording medium 785 or the information recording medium master. .

  The information recording medium thus generated includes the total buffer size of the image data and audio data of the playback device that executes the browsable slide show playback processing, the maximum jump time allowed for data playback, and the data reading in the playback device. A data arrangement in which image data and audio data corresponding to a read rate of image data and audio data determined based on each rate data is set as a jump distance at which a jump process during reproduction can be executed within the maximum jump time. It is configured as an information recording medium having a data recording configuration.

  Specifically, it is configured as an information recording medium having a data recording configuration in which the readout rate of image data and audio data satisfies a combination of the above-described equation (Equation 3 or Equation 4) and the readout rate of image data and audio data. Is done.

[6. Configuration of playback device]
Next, with reference to FIG. 35, a configuration example of a data processing apparatus that performs the above-described data processing, further mounts an information recording medium, and performs data recording / reproducing processing will be described. The data processing apparatus described with reference to FIGS. 20, 33, and 34 is a block diagram for explaining the function of the present invention. The data processing apparatus shown in FIG. 35 is a specific example for executing the function explained in FIG. It is a figure explaining typical hardware constitutions.

  The data processing device 800 drives the information recording medium 891, drives a drive 890 for obtaining data recording / playback signals, a CPU 870 for executing data processing according to various programs, a ROM 860 as a storage area for programs, parameters, and the like, Memory 880, input / output I / F 810 for inputting / outputting digital signals, input / output I / F 840 for inputting / outputting analog signals and having A / D and D / A converters 841, MPEG for encoding and decoding MPEG data The block includes a codec 830, TS / PS processing means 820 for executing TS (Transport Stream) / PS (Program Stream) processing, and cryptographic processing means 850 for executing various cryptographic processing. Each block is connected to the bus 801. .

  First, the operation during data recording will be described. Two cases of digital signal input and analog signal input are assumed as data to be recorded.

  In the case of a digital signal, data input from the digital signal input / output I / F 810 and subjected to appropriate encryption processing by the encryption processing means 850 as necessary is stored in the information recording medium 891. When the data format of the input digital signal is converted and stored, it is converted into a data format for storage by the MPEG codec 830, the CPU 870, and the TS / PS processing means 820, and then the encryption processing means 850 selects an appropriate data format. Encryption processing is performed and the information recording medium 891 is stored.

  In the case of an analog signal, the analog signal input to the input / output I / F 840 is converted into a digital signal by the A / D converter 841 and converted into a codec used during recording by the MPEG codec 830. Thereafter, the TS / PS processing means 820 converts the data into AV multiplexed data, which is the format of the recording data, and the data subjected to appropriate encryption processing by the encryption processing means 850 is stored in the recording medium 891 as necessary. The

  For example, when recording content composed of AV stream data composed of MPEG-TS data, the content is divided into content management units (CPS units), and then encryption processing using a unit key is performed by the encryption processing means 850. It is encrypted and recorded on the recording medium 891 via the drive 890.

  Next, a process for reproducing data from an information recording medium will be described. For example, when reproducing AV stream data composed of MPEG-TS data as content, the data read from the information recording medium 891 in the drive 890 is identified as a content management unit, and a unit key corresponding to the content management unit is obtained. Based on the acquired unit key, the encryption processing means 850 decrypts the encryption, and the TS (Transport Stream) / PS (Program Stream) processing means 820 separates the data into video, audio, subtitles, and the like. It is done.

  The digital data decoded by the MPEG codec 830 is converted into an analog signal by the D / A converter 841 in the input / output I / F 840 and output. When digital output is performed, the MPEG-TS data decrypted by the encryption processing means 850 is output as digital data through the input / output IF 810. The output in this case is made to a digital interface such as IEEE 1394, an Ethernet cable, or a wireless LAN. When the network connection function is supported, the input / output IF 810 has a network connection function. In addition, when data is converted into a format that can be received by the output destination device in the playback apparatus and output, the video codec 830 once converts the video, audio, subtitles, etc. separated by the TS / PS processing means 820. Conversion and codec conversion processing are added, and data multiplexed in MPEG-TS or MPEG-PS again by the TS / PS processing means 820 is output from the digital input / output I / F 810. Alternatively, the CPU 870 can be used to convert to a codec other than MPEG or a multiplexed file and output from the digital input / output I / F 810.

  The playback device of the present invention has, for example, an image data clip storing image data to be applied to a browsable slide show that performs audio playback processing in conjunction with continuous playback of still images, and recording data including an audio data clip storing audio data. Configured as a playback device that executes playback processing of an information recording medium recorded at a predetermined distance, and stores an image data buffer that stores image data read from the information recording medium, and audio data that is read from the information recording medium An audio data buffer, an image data buffer, and a reproduction means for acquiring each data from the audio data buffer and executing a reproduction process, and when the image data buffer holds the maximum amount of image data , Jump operation to audio data recording position separated by a predetermined distance on information recording medium It is configured as a reproducing apparatus and a control unit that performs data reading control for starting and executing such data reading control, effective use and uninterrupted browsable slide show reproduction buffer is implemented.

  A program for executing the reproduction process and the recording process is stored in the ROM 860, and the memory 880 is used as a parameter and data storage and work area as needed during the program execution process. In FIG. 35, a description has been given of a device configuration capable of recording and reproducing data. However, a device having only a reproduction function and a device having only a recording function can be configured, and the present invention can be applied to these devices. Is possible.

  The present invention has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiments without departing from the gist of the present invention. In other words, the present invention has been disclosed in the form of exemplification, and should not be interpreted in a limited manner. In order to determine the gist of the present invention, the claims section described at the beginning should be considered.

  The series of processes described in the specification can be executed by hardware, software, or a combined configuration of both. When executing processing by software, the program recording the processing sequence is installed in a memory in a computer incorporated in dedicated hardware and executed, or the program is executed on a general-purpose computer capable of executing various processing. It can be installed and run.

  For example, the program can be recorded in advance on a hard disk or ROM (Read Only Memory) as a recording medium. Alternatively, the program is temporarily or permanently stored on a removable recording medium such as a flexible disk, a CD-ROM (Compact Disc Read Only Memory), an MO (Magneto optical) disk, a DVD (Digital Versatile Disc), a magnetic disk, or a semiconductor memory. It can be stored (recorded). Such a removable recording medium can be provided as so-called package software.

  The program is installed on the computer from the removable recording medium as described above, or is wirelessly transferred from the download site to the computer, or is wired to the computer via a network such as a LAN (Local Area Network) or the Internet. The computer can receive the program transferred in this manner and install it on a recording medium such as a built-in hard disk.

  Note that the various processes described in the specification are not only executed in time series according to the description, but may be executed in parallel or individually according to the processing capability of the apparatus that executes the processes or as necessary. Further, in this specification, the system is a logical set configuration of a plurality of devices, and the devices of each configuration are not limited to being in the same casing.

  As described above, according to the configuration of the present invention, for example, in the configuration in which image data clips and audio data clips are individually recorded on a disc such as a Blu-ray disc or a DVD disc, An information recording medium that determines an allowable range of jump between an image data clip and an audio data clip necessary for reading data in a so-called browsable slide show that also performs audio reproduction processing, and based on the determined allowable jump range information Since the arrangement condition of the data to be stored in is determined, seamless playback can be performed without interruption of data when executing a browsable slide show that plays back still images and audio in parallel.

  Further, according to the configuration of the present invention, the time required for the jump is calculated based on the determined jump allowable range information, and the image data stored from the information recording medium is stored based on the calculated required jump time. Since the configuration is such that the size of the data buffer and the size of the audio data buffer for storing the audio data are determined, a configuration for seamless playback of the browsable slide show is realized with the minimum necessary small buffer.

  Furthermore, according to the configuration of the present invention, the browsable slide show reproduction process is executed in the determination process of the recording data configuration of the image data and the audio data applied to the browsable slide show that performs the audio reproduction process in conjunction with the continuous reproduction of the still image. Set the total buffer size of the image data and audio data of the playback device as a fixed value, based on the total buffer size of the playback device, the maximum jump time allowed for data playback, and the data read rate data of the playback device Thus, the image data and audio data read rates are determined, so that the image data and audio data read rates can be freely selected from a combination of image data and audio data read rates that can be reproduced without causing data interruption. A device with a read rate with the selected combination. Recording the data, and reproduced, recorded and it is possible to configure to reproduce high-quality data such as 8-channel LPCM data, for example.

  According to the configuration of the present invention, the image data and audio data read rate is determined in the determination processing of the recording data configuration of image data and audio data applied to the browsable slide show that performs audio reproduction processing in conjunction with still image continuous reproduction. Is set as a fixed value [X], and the read rate of image data and audio data is determined based on this setting condition, so that reproduction without causing data interruption is possible. It is possible to record and reproduce data having a readout rate having a combination freely selected from a plurality of combinations of readout rates of image data and audio data satisfying the requirements. For example, high sound quality data such as 8-channel LPCM data Can be recorded and reproduced.

210 Disc navigation program 230, 231 Playlist 232, 233 Play item 250 Clip 251 Image data clip 252 Clip information 253 AV stream 255 Audio data clip 256 Clip information 257 Audio data 331 Reading unit 332 Demodulation / ECC decoding unit 333 Main TS read Buffer 334 Audio TS read buffer 335 Main player 336 Audio player 337 PID filter 338 Audio switch 371 Source depacketizer 372 Arrival time clock counter 373 Pulse oscillator 374 Source depacketizer 375 Arrival time clock counter 376 Pulse oscillator 391 Spindle motor 392 Information recording media Disk)
393 Main TS
394 Audio TS
500 Spindle motor 501 Information recording medium (disc)
511 First layer 512 Second layer 521 Information recording medium (disc)
522 Buffer 523 Decoding unit 531 Read data 532 ECC block 533 ECC block 534 Read data 601 Read data amount 602 Reproduction data amount 603 Buffer data amount 701 Spindle motor 702 Information recording medium (disc)
703 Main TS
704 Audio TS
751 Jump allowable range determining means 752 Jump required time calculating means 753 Buffer size determining means 754 Data arrangement determining means 755 Data recording means 756 Information recording medium 771 Buffer size setting means 772 Table generating means 773 Rate determining means 774 Data recording means 775 Information recording Medium 781 Rate total value setting means 782 Table generating means 783 Rate determining means 784 Data recording means 785 Information recording medium 800 Data processing device 801 Bus 810 I / O I / F
820 TS / PS processing means 830 MPEG codec 840 I / O I / F
841 A / D, D / A converter 850 Encryption processing means 860 ROM
870 CPU
880 Memory 890 Drive 891 Information recording medium

Claims (11)

Recording data including an image data clip storing image data and an audio data clip storing audio data to be applied to a browsable slide show that performs audio playback without synchronizing with still image playback performed based on a playback command from the user A data processing method for determining an arrangement configuration for an information recording medium,
An area in which the image data clip and the audio data clip are arranged as one piece of physically continuous data, an image data clip to be stored in an information recording medium is recorded, and an area in which the audio data clip is recorded A data arrangement determining step for determining the data arrangement so that the maximum distance from the innermost circumference of the information recording medium is set within a jump allowable range equal to or less than half the full stroke from the innermost circumference to the outermost circumference of the information recording medium. A data processing method. The data arrangement determining step includes:
Calculating the data size S _MAIN of the image data clip and the data size S _SUB of the audio data clip to be applied to the browsable slide show;
When the value of the jump allowable range calculated in the jump allowable range determining step is D _MAX , the following conditions (a), (b),
(A) S _MAIN + S _SUB ≦ D _MAX ,
(B) The image data clip and the audio data clip are continuously arranged in the area of size D _MAX ,
The data processing method according to claim 1, wherein the data arrangement configuration is determined to satisfy the setting. The data processing method further includes:
2. The data processing method according to claim 1, further comprising a data recording step of executing data recording on the information recording medium in accordance with the data arrangement condition determined in the data arrangement determining step. Recording data including an image data clip storing image data and an audio data clip storing audio data to be applied to a browsable slide show that performs audio playback without synchronizing with still image playback performed based on a playback command from the user A data processing device for determining an arrangement configuration for an information recording medium,
An area in which the image data clip and the audio data clip are arranged as one piece of physically continuous data, an image data clip to be stored in an information recording medium is recorded, and an area in which the audio data clip is recorded A data arrangement determining means for determining a data arrangement so as to set a jump distance within a half stroke corresponding to half of a full stroke from the innermost circumference to the outermost circumference of the information recording medium;
A data processing apparatus comprising: The data arrangement determining means is
Calculating the data size S _MAIN of the image data clip and the data size S _SUB of the audio data clip to be applied to the browsable slide show;
When the value of the jump allowable range calculated by the jump allowable range determining means is D _MAX , the following conditions (a), (b),
(A) S _MAIN + S _SUB ≦ D _MAX ,
(B) The image data clip and the audio data clip are continuously arranged in the area of size D _MAX ,
The data processing apparatus according to claim 4, wherein the data processing apparatus is configured to determine a data arrangement configuration having a setting that satisfies the requirements. The data processing device further includes:
5. The data processing apparatus according to claim 4, further comprising data recording means for executing data recording on the information recording medium in accordance with the data arrangement condition determined by the data arrangement determining means. An information recording medium,
An audio data clip storing image data clips and audio data is stored as recording data,
The image data clip and audio data clip applied to the browsable slide show that performs audio reproduction processing in conjunction with still image continuous reproduction are arranged as one piece of physically continuous data, and stored in the information recording medium. The maximum distance between the area in which the clip is recorded and the area in which the audio data clip is recorded is within a jump allowable range equal to or less than a half stroke corresponding to 1/2 of the full stroke from the innermost circumference to the outermost circumference of the information recording medium. An information recording medium having a data arrangement configuration stored together with the area. The information recording medium is
When the data size of the image data clip applied to the browsable slide show is S _MAIN , the data size of the audio data clip is S _SUB , and the value of the jump allowable range is D _MAX , the following conditions (a), (b),
(A) S _MAIN + S _SUB ≦ D _MAX ,
(B) The image data clip and the audio data clip are continuously arranged in the area of size D _MAX ,
The information recording medium according to claim 7, wherein the information recording medium satisfies the following requirements. Recording data including an image data clip storing image data and an audio data clip storing audio data to be applied to a browsable slide show that performs audio playback without synchronizing with still image playback performed based on a playback command from the user A computer program for executing processing for determining an arrangement configuration with respect to an information recording medium,
An area in which the image data clip and the audio data clip are arranged as one piece of physically continuous data, an image data clip to be stored in an information recording medium is recorded, and an area in which the audio data clip is recorded A data arrangement determining step for determining the data arrangement so that the maximum distance from the innermost circumference of the information recording medium is set within a jump allowable range equal to or less than half the full stroke from the innermost circumference to the outermost circumference of the information recording medium. A computer program characterized by the above. An information recording medium manufacturing method,
An image data clip and an audio data clip storing image data and audio data to be applied to the browsable slide show are set as physically continuous recording positions on the information recording medium as one continuous data, and the image data The maximum distance between the recording area of the clip and the recording area of the audio data clip is set within a jump allowable range equal to or less than a half stroke corresponding to 1/2 of the full stroke from the innermost circumference to the outermost circumference of the information recording medium. A data arrangement determining step for determining the data arrangement;
A recording step for executing processing for recording image data and audio data on an information recording medium or an information recording medium master according to the data arrangement determined in the data arrangement determining step;
An information recording medium manufacturing method comprising: A playback device that executes playback processing of an information recording medium,
The information recording medium is an image data clip and an audio data clip storing image data and audio data to be applied to a browsable slide show, each recorded as one continuous data at physically continuous recording positions on the information recording medium, The maximum distance between the recording area of the image data clip and the recording area of the audio data clip is set within a jump allowable range equal to or less than a half stroke corresponding to 1/2 of the full stroke from the innermost circumference to the outermost circumference of the information recording medium. Have a data arrangement
An image data buffer for storing image data to be applied to a browsable slide show read from an information recording medium;
An audio data buffer for storing audio data to be applied to the browsable slide show read from the information recording medium;
Reproduction means for obtaining each data from the image data buffer and the audio data buffer and executing reproduction processing;
A control unit for performing data reading control for starting a jump operation at an audio data recording position separated by a distance equal to or less than the jump allowable range in the information recording medium when image data is held in the image data buffer to the maximum extent;
A data reproducing apparatus comprising: