JP2005108363A - Apparatus and method for reproducing information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a apparatus and a method for reproducing information which are not dependent on navigation data reading constraints. <P>SOLUTION: In the apparatus for reproducing information, two kinds of data are reproduced by a disk driving part 3 from a disk 2 in which stream data such as coded video information and navigation data for controlling the reproduction of the stream data are recorded, and a navigation pack detection part 4 performs control corresponding to the kind of data reproduced from the disk driving part 3 so as to store the stream data in a stream buffer part 5 and the navigation data in a navigation pack buffer part 6. Thus, a block for executing reproduction control performs reproduction control by using the navigation pack, and the problem of navigation data reading constraints is solved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information reproducing apparatus and an information reproducing method for reproducing information from a recording medium such as an optical disk on which stream data such as video information and navigation data for controlling reproduction of the data are recorded.

  In a conventional DVD playback system, a stream output from a DVD is stored in a data buffer (hereinafter referred to as a track buffer), and the data stored in the track buffer is input to each decoder according to the type of the data. For this purpose, distribution (demultiplexing) processing is performed and buffering is performed. This buffering area is referred to as an STD buffer. Data handled by a DVD is roughly classified into a navigation pack for controlling reproduction and data input, video data, audio data, and sub-picture data (see Patent Document 1).

  A circuit block that performs demultiplex processing is referred to as a program stream decoder (hereinafter referred to as PSD). Each decoder decodes and outputs the data stored in the STD buffer by PSD.

  Conventionally, a block for performing playback control (hereinafter referred to as a host) performs playback control using a navigation pack, but it is necessary to read data from data stored in a track buffer. Therefore, when the PSD demultiplexes the stream from the track buffer, it is necessary to monitor the navigation pack reading status of the host, or the host needs to copy the navigation pack data from the track buffer to its working memory. Restrictions were necessary because a stream was supplied to each decoder.

In addition, multi-angle playback is defined in the DVD standard, but multi-angle playback is performed by reading out only the stream of the corresponding angle recorded on the disc from the disc and decoding it. In general, the user is notified of the angle number being displayed by displaying the angle number being currently reproduced on the television screen, but the host displays the angle number being captured by the track buffer. However, when the angle number is changed one after another, there is a problem that the angle number actually superimposed and the angle number superimposed on the image on the television screen may not match.
JP-A-11-69307 (pages 5 to 6, FIG. 6)

As described above, conventionally, a block that performs reproduction control performs reproduction control using a navigation pack, but it is necessary to read data from data stored in a track buffer. Therefore, when the PSD demultiplexes the stream from the track buffer, it is necessary to monitor the navigation pack reading status of the host, or the host needs to copy the navigation pack data from the track buffer to its working memory. There is a problem that a restriction is necessary because a stream is supplied to each decoder.
The present invention has been made in view of these points, and an object thereof is to provide an information reproducing apparatus and an information reproducing method that do not depend on reading restrictions on navigation data.

  In order to achieve the above object, an information reproducing apparatus according to claim 1 is characterized in that said 2 is recorded from a recording medium on which stream data such as encoded video information and navigation data for controlling reproduction of this data are recorded. Depending on the type of data reproduced from the reproducing means, the means for reproducing the data of the type, the first memory for storing the stream data, the second memory for storing the navigation data, and the data reproduced from the reproducing means Data separation control means for storing in a first memory and storing the navigation data in the second memory is provided.

  An information reproducing apparatus according to claim 2 is the information reproducing apparatus according to claim 1, wherein the stream data stored in the first memory is decoded and stored in the second memory. Control means for controlling the apparatus based on the navigation data, and the decoding means and the control means can be operated independently.

  Furthermore, an information reproducing apparatus according to claim 3 is characterized in that, in the information reproducing apparatus according to claim 1, the data separation control means is configured to be able to set determination conditions for data to be separated. is there.

  The information reproducing apparatus according to claim 4 is characterized in that the data separation control means is configured to be able to set a buffer size of data to be separated and stored.

  An information reproducing apparatus according to a fifth aspect is the information reproducing apparatus according to the first aspect, wherein the data separation control means is configured to process a part or all of data to be separated and stored into a set format. It is characterized by that.

  An information reproducing apparatus according to a sixth aspect is the information reproducing apparatus according to the first aspect, wherein the data separation control unit adds information associated with the data to the data to be separated and stored. It is characterized by this.

  8. The information reproducing apparatus according to claim 7, wherein the recording medium is a DVD disc on which multi-angle data is recorded, and the data separation control unit sets an angle number of the multi-angle data to the second memory. The information reproducing apparatus is characterized in that it is configured to control writing in the empty area.

  An information reproduction method according to claim 8 is a reproduction step of reproducing the two kinds of data from a recording medium in which stream data such as encoded video information and navigation data for controlling reproduction of the data are recorded. If the data reproduced from the reproducing means is the stream data, the data is stored in a first memory for storing stream data. If the data reproduced from the reproducing means is the navigation data, the second data for storing navigation data is stored. And a data separation storage step for storing in the memory.

  According to the present invention, it is possible to provide an information reproducing apparatus and an information reproducing method that do not depend on navigation data reading restrictions.

  Embodiments of an information reproducing apparatus and an information reproducing method according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a circuit block diagram showing an embodiment of an information reproducing apparatus according to the present invention. In the figure, reference numeral 1 denotes a DVD reproducing apparatus main body, and reference numeral 2 denotes an optical disk as a recording medium. Reference numeral 3 denotes a disk drive unit that drives the optical disk 2 and reads the recorded data recorded on the optical disk 2 to perform signal demodulation and error correction. Further, 4 detects whether the data output from the disk drive unit 3 is a navigation data pack (hereinafter referred to as “Navi Pack”), which will be described in detail later, or other data, and performs data buffering control. This is a navigation pack detection unit (Navi Pack detection unit) to be performed.

  Reference numerals 5 and 6 are respectively connected to the navigation pack detection unit 4, and a stream buffer unit for buffering data output from the disk drive unit 3, and only the navigation pack detected by the navigation pack detection unit 4 is buffered. Navi pack buffer unit (Navi Pack buffer unit).

  7 divides the stream data buffered in the stream buffer unit 5 into a video pack composed of video data, a sub-picture pack composed of sub-picture data, and an audio pack composed of audio data. A stream decoder unit that transfers each data to each decoder unit of a video decoder unit 8, a sub-picture decoder unit 9, and an audio decoder unit 10 to be described later with reference to ID data indicating a transfer time and data type recorded in the data It is.

  8 is a video decoder unit for decoding the video data transferred from the stream decoder unit 7, 9 is a sub-picture decoder unit for decoding the sub-video data transferred from the stream decoder unit 7 and displaying highlights, 10 The audio decoder unit decodes the audio data transferred from the stream decoder unit 7.

  Reference numeral 11 denotes a display control unit that converts the digital signals output from the video decoder unit 8 and the sub-picture decoder unit 9 into analog signals and multiplexes them, and 12 reproduces the data output from the display control unit 11 as an image. It is a monitor unit.

  Reference numeral 13 denotes a D / A converter that converts the digital signal output from the audio decoder 10 into an analog signal, and reference numeral 14 denotes a speaker that reproduces data output from the D / A converter 14 as sound.

  15 reads the navigation pack information from the navigation pack buffer unit 6, and receives a reproduction instruction (including highlight control) corresponding to a user operation from the key input unit 16 that receives an instruction request from the user to the presentation engine unit 17 to be described later. It is a navigation manager section to perform. Reference numeral 18 denotes a panel display unit for displaying disc information and reproduction information.

  The presentation engine unit 17 controls the disk drive unit 3, the stream buffer unit 5, the stream decoder unit 7, the video decoder unit 8, the sub-picture decoder unit 9, the audio decoder unit 10, and the display control unit 11, and also a navigation manager. Highlight information given from the unit 15 is set in the sub-picture decoder unit 9, and highlight time control, highlight display state management, and interrupt notification are performed.

Next, the operation of the apparatus shown in FIG. 1 will be described. The disk drive unit 3 drives the optical disk 2 that is a recording medium, reads out the recording data recorded on the optical disk 2, and performs signal demodulation and error correction. The data output from the disk drive unit 3 is detected by the navigation pack detection unit 4 as to whether it is a navigation pack or other data. If it is navigation pack data, it is input to the navigation pack buffer unit 6, otherwise Input to the stream buffer unit 5.

  In the stream decoder unit 7, the stream data buffered in the stream buffer unit 5 is divided into three types: a video pack composed of video data, a sub-picture pack composed of sub-picture data, and an audio pack composed of audio data. Carved. Then, with reference to the ID data indicating the transfer time and data type recorded in each data, the data is transferred to each decoder unit of the video decoder unit 8, the sub-picture decoder unit 9, and the audio decoder unit 10, respectively.

  The video decoder unit 8 decodes the video data transferred from the stream decoder unit 7, and the sub-picture decoder unit 9 decodes the sub-picture data transferred from the stream decoder unit 7 and displays a highlight. The digital signals output from the video decoder unit 8 and the sub-picture decoder unit 9 are converted into analog signals by the display control unit 11 and multiplexed, and then reproduced as an image by the monitor unit 12.

  On the other hand, in the audio decoder unit 10, the audio data transferred from the stream decoder unit 7 is decoded, the digital signal is converted into an analog signal by the D / A conversion unit 13, and finally reproduced as sound from the speaker unit 14. Will be.

  Various playback instructions from the user are input to the navigation manager unit 15 via the key input unit 16, where the playback instructions are based on the navigation pack information from the navigation pack buffer unit 6, and the presentation / It is sent to the engine unit 17. Similarly, various display instructions from the user are input to the navigation manager unit 15 via the key input unit 16, and disc information and reproduction information are displayed on the panel display unit 18.

  The presentation engine unit 17 controls the disk drive unit 3, the stream buffer unit 5, the stream decoder unit 7, the video decoder unit 8, the sub-picture decoder unit 9, the audio decoder unit 10, and the display control unit 11, and also a navigation manager. Highlight information provided from the unit 15 is set to the sub-picture decoder unit 9, and highlight time control, highlight display state management, and interrupt notification are performed.

  Next, the pack structure of the recording data recorded on the optical disc 2 necessary for explaining the operation of the navigation pack detection unit 4 in FIG. 1 in detail will be described.

  FIG. 2 is a diagram showing a pack structure example of recording data recorded on the optical disc 2. A video object set (Video Object Set (hereinafter referred to as VOBS)) 21 shown in FIG. 6A is an aggregate of Video Objects (VOB) 22 as shown in FIG. The VOB 22 is an MPEG program stream in which a plurality of elementary streams are assembled. As shown in FIG. 5C, the Cell 23 is a basic unit of content to be reproduced. As shown in FIG. 4D, the Cell 23 is composed of a plurality of Video Object Units (VOBU) 24 and is a constituent element of the VOB 22.

  The VOBU 24 is composed of a plurality of navigation packs (NV_PCK) 25, V_PCK26, A_PCK27, and SP_PCK28 as shown in FIG. The NV_PCK 25 is recorded at the head of each VOBU 24, and the detailed configuration thereof includes a pack header 29 and a system header 30, one PCI packet (PCI_PKT) 31, one DSI packet (as shown in FIG. DSI_PKT) 32.

The PCI_PKT 31 includes a packet header 33, a sub stream ID (Sub_Stream_ID) 34, and a PCI 35, as shown in FIG. The PCI 35 is navigation data for controlling the reproduction of the VOBU 24, and the navigation manager unit 15 (see FIG. 1) controls the reproduction based on the information of the PCI 35.

  FIG. 3 is a diagram showing the structure of the PCI 35 shown in FIG. As shown in FIG. 3B, the PCI 41 includes four pieces of information: PCI information (PCI_GI) 42, NSML_AGLI (non-seamless angle information) 43, HLI (highlight information) 44, and RECI (recording information) 45. ing. The HLI (highlight information) 44 is information for highlighting one rectangular area in the sub-picture display area. As shown in FIG. 3C, the HL_GI (highlight general information) 46, BTN_COLOR (button color information). Table) 47 and BTNIT (button information table) 48.

  FIG. 4 shows in detail the structure of the navigation pack (NV_PCK) 25 shown in FIGS. 2 (E) and 2 (F). That is, the navigation pack 25 includes a pack header 51 (same as 29 in FIG. 2F), a system header (System Header) 52 (same as 30 in FIG. 2F), and a packet header. 53 (same as 33 in FIG. 2G), sub stream ID 54 (same as 34 in FIG. 2G), PCI data 55 (same as 35 in FIG. 2G), packet header 56, sub The stream ID 57 and the DSI data 58 (the above-described 56 to 58 form the DSI packet 32 of FIG. 2F).

  Based on the pack structure of the recording data recorded on the optical disc 2 described above, the operation of the navigation pack detection unit 4 in FIG. 1 will be described in detail with reference to the flowchart in FIG.

  FIG. 5 is a flowchart showing an example of a control flow of the navigation pack detection unit 4 of FIG. In the present embodiment, the system header 52, packet header 53, and sub-stream ID 54 shown in FIG. 4 are used as data for detecting a navigation pack. In addition, by making it possible to set comparison data for the ID comparison portion, it is possible to detect other than the navigation pack.

  First, it is checked whether or not the system header (4 bytes) 52 is “000001BBh” (step S1). If it is “000001BBh” (YES in step S1), it is checked whether or not the packet header (4 bytes) 53 is “000001BFh” (step S2). The packet header 53 is composed of a 3-byte Packet # Start # Code # Prifix and a 1-byte Stream # ID in detail. If NO in step S1, it is determined that it is not a navigation pack, and the data is transferred to the stream buffer unit 5 (step S3).

If YES in step S2 (ie, if the system header 52 is “000001BBh”), it is further checked whether the sub-stream ID 54 (1 byte) is “00h” (step S4). If NO in step S2, it is determined that it is not a navigation pack, and the data is transferred to the stream buffer unit 5 (step S3).
If YES in step S4 (that is, if the sub-stream ID 54 is “00h”), it is determined that the data is a navigation pack, and the data is transferred to the navigation pack buffer unit 6 (step S5).

On the other hand, if NO in step S4, it is determined that it is not a navigation pack, and the data is transferred to the stream buffer unit 5 (step S3). Thus, the control flow of the navigation pack detection unit 4 ends. In step S5, there is no problem if the data is transferred to the navigation pack buffer unit 6 and also transferred to the stream buffer unit 5. In this case, the navigation pack data exists in both the stream buffer unit 5 and the navigation pack buffer unit 6.

  FIG. 6 is a diagram for explaining the data structure in the navigation pack buffer unit 6, and FIG. 6A shows the structure of the buffering state of the navigation pack data 61. This figure shows a case in which a memory area of 2048 bytes per pack is used and buffering for a maximum of 7 packets is possible (navigation buffers 62 to 68).

  On the other hand, FIG. 6B is a diagram showing an example of the data structure in the navigation pack buffer unit 6. The navigation pack data stored in the navigation pack buffer unit 6 is used by the presentation engine unit 17 and the navigation manager unit 15 to control the system. Here, in the above control, the control may be facilitated by accumulating only necessary data. Therefore, the structure of the navigation pack defined in the DVD standard is as shown in FIG. 4, but the navigation pack detection unit 4 buffers only necessary data from the navigation pack.

  Further, at this time, it is characterized in that capture information in which the disk drive unit captures data is also added. FIG. 6B shows this situation, that is, the buffered data 71 is composed of PCI data 72, Don't Care 73, angle number (Angle No) 74, DSI data 75, and Don't Care 76. Has been.

  Finally, data capture during angle reproduction will be described with reference to the drawings. FIG. 7 is a flowchart for explaining the data fetching operation during angle reproduction. Angle playback in the DVD standard enables smooth angle changes and the like by reading data in units of interleaved units. That is, when an angle change request is made during interleaved unit playback, the disc drive unit 3 takes in the interleaved unit requested to change the angle when the interleaved unit currently being fetched is finished. By starting, the angle can be changed seamlessly.

  Specifically, the presentation engine unit 17 first sets an interleaved unit (ILVU) capturing section (step S11). Next, the disk drive unit 3 is requested to take in data by servo (step S12). Then, it is determined whether the ILVU uptake has been completed (step S13). If completed, the process returns to step S11 again to set a new ILVU import section.

  If it is determined in step S13 that ILVU capturing has not been completed, it is determined whether capturing of one packet data has been completed (step S14). If the capturing of one packet data has been completed, the navigation pack detection unit 4 determines whether or not the data is a navigation pack (step S15). If the capturing of one packet data is not completed, the process returns to step S14 again.

  If it is determined in step S15 that the data is a navigation pack, the packet data is transferred to the navigation pack buffer unit 6 (step S16). If it is determined that the data is not a navigation pack, the packet data Is transferred to the stream buffer unit 5 (step S17). Finally, it is determined whether or not all data has been imported (step S18). If all the data has been imported, the flow ends. Otherwise, the process returns to step S14.

  When the angle is changed as described above, if the navigation manager unit 15 notifies the user of the angle number currently being reproduced in the form of being superimposed on the screen (OSD display), the interleaving currently being captured If the angle number of the video unit is displayed, it takes time until the data actually fetched from the disc 2 by the disc drive unit 3 is output to the television screen. Inconsistencies may occur on the screen being played.

  Therefore, in the present embodiment, the currently acquired angle number information is recorded in the navigation buffer. The navigation manager unit 15 controls the PCI information 72 in the navigation buffer in synchronization with the VOBU that is actually reproduced. In synchronism with the PCI information control timing, the angle number information 74 (see FIG. 6B) recorded in the navigation buffer is read, and the angle number is displayed on the OSD, so that the television receiver is actually used. The output video and the OSD number are matched. In addition, it can be considered that control is facilitated by writing information necessary for performing playback control in the navigation buffer area.

  The effect of separating the navigation pack in the data input part is described below. The navigation pack includes PCI information and DSI information as shown in FIG. The navigation pack is uniquely arranged at the head of the VOBU, and information for performing control for reproducing the VOBU is described in the PCI. In addition, information for performing data input control of VOBU is described in DSI.

  Control timing for data input and VOBU playback control are greatly different in terms of time. In other words, when there is an empty area for capturing data in the stream buffer unit 5, data input control is performed using the DSI information one after another, so that stable reproduction can be performed systematically. This is because the data can be stably input to the system by not creating an empty state in the stream buffer unit 5.

  On the other hand, for the video and audio output, the stream decoder unit 7 supplies the stream from the stream buffer unit 5 to the decoder units 8 to 10, and the decoder units 8 to 10 synchronize with the time information described in the stream. Output. The PCI information is played back in synchronization with the time information for this output.

  When the navigation pack buffer unit 6 does not exist, the navigation manager unit 15 performs control by reading the DSI information and PCI information directly from the conventional track buffer, or the stream decoder unit 7 separates the navigation pack and separates it. Information needs to be read and controlled by the navigation manager 15.

  When the PCI information is read directly from the track buffer, it is necessary to hold data in the track buffer until the PCI information becomes unnecessary. However, in this case, other streams are not supplied to the stream decoder unit 7 and later, Regeneration is delayed. Therefore, the navigation manager unit 15 needs to save PCI information from the track buffer to a work memory or the like. However, in this method, the stream decoder unit 7 cannot read data from the track buffer while the navigation manager unit 15 saves the data in the work memory.

The navigation pack in which information having different control timings is stored in one packet is separated and buffered before the data is saved in the stream buffer unit 5, whereby the stream decoder unit 7 and the navigation manager The system can be controlled without depending on the operation timing of the unit 15. This ensures a stable DV
It is possible to provide a D playback system.

  Even if the disc 2 inserted into the system is not a DVD video format itself but another stream, it is possible to separate various streams by making it possible to set the segmentation conditions. As a result, the degree of freedom of the stream format can be increased.

1 is a circuit block diagram showing an embodiment of an information reproducing apparatus according to the present invention. The figure which showed the pack structure example of the recording data currently recorded on the optical disk of FIG. The figure which showed the structure of PCI of FIG. The figure which showed the structure of the navigation pack of FIG. The flowchart which shows one Example of the control flow of the navigation pack detection part of FIG. The figure which shows an example of the data structure of the navigation pack buffer part of FIG. The flowchart for demonstrating the data acquisition operation | movement during an angle reproduction | regeneration.

Explanation of symbols

1: DVD player main unit 2: Optical disc 3: Disc drive unit 4: Navi pack detection unit 5: Stream buffer unit 6: Navi pack buffer unit 7: Stream decoder unit 8: Video decoder unit 9: Sub-picture decoder unit 11: Display Control unit 12: Monitor unit 15: Navigation manager unit 16: Key input unit 18: Presentation engine unit

Claims (8)

  Means for reproducing the two types of data from a recording medium in which stream data such as encoded video information and navigation data for controlling reproduction of the data are recorded; and a first for storing the stream data The stream data is stored in the first memory according to the type of data reproduced from the reproduction means, the second memory for storing the navigation data, and the navigation data is stored in the second memory. An information reproducing apparatus comprising data separation control means for storing.   2. The information reproducing apparatus according to claim 1, wherein the apparatus is controlled based on the decoding means for decoding the stream data stored in the first memory and the navigation data stored in the second memory. An information reproducing apparatus comprising: control means for performing the operation, wherein the decoding means and the control means are operable independently.   2. The information reproducing apparatus according to claim 1, wherein the data separation control unit is configured to be able to set a determination condition for data to be separated.   2. The information reproducing apparatus according to claim 1, wherein the data separation control unit is configured to set a buffer size of data to be separated and stored.   2. The information reproducing apparatus according to claim 1, wherein the data separation control means is configured to process part or all of data to be separated and stored into a set format.   2. The information reproducing apparatus according to claim 1, wherein the data separation control means is configured to add information accompanying the data to the data to be separated and stored.   7. The information reproducing apparatus according to claim 6, wherein the recording medium is a DVD disc on which multi-angle data is recorded, and the data separation control means writes the angle number of the multi-angle data in an empty area of the second memory. An information reproducing apparatus configured to be controlled as described above. A reproduction step for reproducing the two types of data from a recording medium in which stream data such as encoded video information and navigation data for controlling reproduction of the data is recorded, and data reproduced from the reproduction means A data separation and storage step of storing in a first memory for storing stream data if the data is the stream data and storing in a second memory for storing navigation data if the data reproduced from the reproducing means is the navigation data; An information reproducing method comprising:

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