JP2005033721A - Information recording apparatus and information recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording apparatus which can instantaneously judge before conversion whether contents recorded in a first format can be converted into a second format. <P>SOLUTION: The information recording apparatus includes: an encoder 4 for receiving, from a host microcomputer 5, information representing that digital data of a format conforming to the DVD video recording standard can be converted (digitally converted) into a format conforming to the DVD video recording standard while keeping the digital data without decoding them, performing compression-encoding of AV data to generate digital data of a DVD video recording format, and outputting digital conversion information required for digitally converting the generated digital data into data of a DVD video format; and a recording/reproducing part 11 for describing the digital conversion information in a user area within a video object unit and further describing a flag representing that the digital conversion information is contained, in a user area within management information in the case of recording data in the DVD video recording format when the digital data can be converted into the DVD video format. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for converting content recorded in the DVD video recording standard to the DVD video standard at high speed.

  DVD includes a DVD video recording standard for real-time recording of content and a DVD video standard that can be played back by a playback-only DVD player.

  In a digital recording device such as a DVD recorder, recording is generally performed in accordance with the DVD video recording standard because editing is easy. However, in order to perform playback on other devices such as a DVD player, it is necessary to convert content recorded in the DVD video recording standard into the DVD video standard.

  Conventionally, in order to convert from a DVD video recording standard format to a DVD video standard format, a method of decoding (analogizing) a digital signal and then re-encoding and recording has been taken. However, in this method, since decoding is performed once and then re-encoding is performed, not only the conversion time requires the same time as the recording time but also the image quality of the content deteriorates.

Therefore, as a technology for converting digitally recorded content into another format without decoding it, for example, an apparatus for converting a data stream in RTR (Real Time Recording) format into a data format in DVD video format And a method is disclosed in US Pat. Hereinafter, converting a digital signal recorded in the first format into a second format different from the first format without decoding the digital data is referred to as “digital conversion”.
JP 2003-101927 A

  However, in the past, when trying to convert digitally recorded content into another format by digital conversion, it is not known whether or not the digital conversion is possible without actually starting the conversion and performing stream analysis. There wasn't.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an information recording apparatus that can instantly determine whether or not content recorded in a first format can be converted into a second format before conversion.

  In order to achieve the above object, an information recording apparatus according to the present invention includes (1) digital data of a first format configured by a plurality of video object units (VOBU) which are minimum video recording units. Is it possible to convert digital data as it is without decoding into digital data of a second format different from the first format, which is composed of a plurality of video object units, which are minimum video recording units? And (2) compressing and encoding AV data to generate digital data in the first format, and converting the data in the first format into data in the second format. An encoder that outputs digital conversion information necessary for conversion as it is, and (3) the input unit When the input information indicates that there is a possibility of conversion to the second format, when the digital data of the first format is recorded on a recording medium, the digital conversion information is converted into a video object unit. And a recording unit for describing in the user area in the management information a first flag indicating that the digital conversion information is included in the digital data of the first format. It is characterized by.

  As described above in detail, according to the present invention, it is possible to provide an information recording apparatus capable of instantaneously determining whether or not the content recorded in the first format can be converted into the second format before the conversion. .

  In the information recording apparatus according to the above configuration, at the time of recording in the first format, the user selects and inputs in advance whether there is a possibility of digital conversion to the second format. First, the first format has an area (user area) in which a user can describe unique information in a video object unit (VOBU). The second format has, for example, first information (A_SYNCA) that is an address of audio data and second information (VOBU_2NDREF_EA, VOBU_3RDREF_EA) that is an address of video data. This is digital conversion information necessary for conversion from the first format to the second format as it is (digital conversion). When generating the data of the first format on the premise of such conversion to the second format, the first information and the second information (digital conversion information) are stored in the user in the video object unit. Store in the area. At this time, information (first flag) indicating that the first information and the second information are included in the user area in the management information (for example, VR_MANGR.IFO) is also stored. Keep it. Thus, when digital conversion from the first format to the second format is performed, whether information for digital conversion is included only by referring to the user area in the management information (VR_MANGR.IFO). It can be judged instantly without analyzing the stream.

  In the information recording apparatus according to the above configuration, when there is a possibility of the conversion, when the digital data is recorded on the recording medium in the first format, the recording unit stores the digital conversion information in each video object unit. It is preferable to describe the second flag indicating that it is included in the user area in the video object unit including the digital conversion information.

  In the information recording apparatus according to the above configuration, a digital conversion correspondence information determination unit that analyzes whether or not the second flag is present in a user area in the video object unit, and digital data in the second format data A copy unit that creates a copy of the data in the first format recorded on the assumption that there is a possibility of conversion without change, and when the copy unit creates a copy of the data in the first format, When the digital conversion correspondence information determination unit determines that the second flag exists in the user area in the video object unit, the recording unit sets the first flag in the user area in the copy destination management information. Preferably described.

  In this configuration, when a copy of the data in the first format is created, all the digital conversion information described in the user area in the video object unit in the first format is analyzed at the time of duplication. The first flag described in the user area is updated. As a result, it is possible to ensure that the digital conversion information is not destroyed even by copying.

  In the information recording apparatus according to the above configuration, when converting from the first format to the second format, a digital for determining whether or not conversion is possible with digital data referring to the first flag It is preferable to further include a conversion possibility determination unit.

  Also, the second information recording apparatus according to the present invention provides digital data of the first format, which is composed of a plurality of video object units, which are minimum video recording units, as video object units, which are minimum video recording units. Is an information recording device for converting digital data as it is without decoding into digital data in a second format different from the first format, the video object having the first format The unit includes first time stamp information, a first pack, and digital conversion information necessary for converting the data in the first format into the data in the second format as digital data. Video object unit of the format of the second time stamp information and the second The information recording device includes a time stamp converting unit that converts the first time stamp information into the second time stamp information based on the digital conversion information, and the digital conversion information based on the digital conversion information. A pack conversion unit that converts the first pack into the second pack, and when the digital data is converted from the first format to the second format as it is, the time stamp conversion unit and the pack conversion unit; Are operated in parallel.

  In the second information recording apparatus having the above-described configuration, when the data in the first format is edited and the edited data is converted into data in the second format, the edited data It is preferable to further include a recording unit that describes a third flag for prohibiting forward reference from the first video object unit in the video object unit.

  In this configuration, even when editing processing such as division is performed on the content in the first format, the forward reference from the first video object unit is prohibited at the time of conversion to the second format. 3 flag is described in the video object unit. The description of the third flag can be realized, for example, by setting Brokenlink of the GOP layer to 1. Thus, digital conversion can be performed by not performing forward reference to the B picture of the first VOBU of the edited video object (VOB). When this processing is not performed on content that has been edited such as division, the first B picture included in the first VOBU of the new VOB created by dividing from the middle of the VOB is not divided. A problem occurs because the I or P picture is referred to. However, by setting Brokenlink to 1, forward reference is not performed, and no malfunction occurs.

  In the information recording apparatus according to each of the above configurations, it is preferable that the first format is a format compliant with the DVD video recording standard, and the second format is a format compliant with the DVD video standard.

  A first recording medium according to the present invention is a recording medium on which digital data of a first format configured by a plurality of video object units, which are minimum video recording units, is recorded. Digital conversion necessary to convert the format into digital data of a second format different from the first format, which is composed of a plurality of video object units, which are minimum video recording units. Information is described in the user area in the video object unit, and a first flag indicating that the digital conversion information is included in the digital data in the first format is described in the user area in the management information. It is characterized by being.

  Further, in the second recording medium according to the present invention, the second flag indicating that each video object unit includes digital conversion information in the first recording medium is a user area in each video object unit. Is described.

  Further, the third information recording apparatus according to the present invention reads the digital data of the first format from the first or second information recording medium, converts the digital data to the digital data of the second format, and records it. And in the information recording medium, conversion from the first format to the second format as it is based on whether or not the first flag is described in the user area in the management information And a digital conversion enable / disable determining unit that determines whether or not it is possible.

  Further, a fourth information recording apparatus according to the present invention reads information in the first format from the first or second information recording medium, converts the digital data to the second format, and records the data. An apparatus of claim 1, wherein the first format video object unit includes first time stamp information and a first pack, and the second format video object unit includes second time stamp information and a first pack. The information recording apparatus includes a time stamp conversion unit that converts the first time stamp information into the second time stamp information based on the digital conversion information, and the digital conversion information. A pack conversion unit for converting the first pack into the second pack, and from the first format When converting into 2 format remains digital data, and the time stamp conversion unit and the pack conversion unit is characterized in that operate in parallel.

  In the above configuration, when the data in the first format has been edited, a third flag for prohibiting forward reference from the first video object unit of the edited data is described in the video object unit. It is preferable to further include a recording unit.

  According to a fifth information recording apparatus of the present invention, there is provided a duplicating unit that reads digital data in the first format from the second information recording medium and creates a duplicate in the first format, and a video object unit. A digital conversion correspondence information determination unit that analyzes whether or not the second flag exists in the user area, and the digital conversion correspondence information determination unit when creating a copy of the data in the first format by the duplication unit Thus, when it is determined that the second flag exists in the user area in the video object unit, the user area in the copy destination management information includes a recording unit that describes the first flag. And

  Also, the first information (A_SYNCA) and the second information (VOBU_2NDREF_EA, VOBU_3RDREF_EA) are extracted, and the M_AVFIT (Movie AV File Information Table) of the first information, the second information, and the management information is extracted. Based on ORG_PGCI (Original PGC Information), a process for generating information (navigation information) for controlling data reproduction in the second format, and a process for converting a pack in the first format into a pack in the second format (SCR) Subtraction processing, PTS, DTS subtraction processing, PES_EXTENSION_field deletion, audio frame number setting, and BrokenLINK = 1 setting) are performed in parallel. From a first format at remote high speed it can be converted into data of the second format.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  Here, a description will be given assuming that a format compliant with the DVD video recording standard is assumed as the first format and a format compliant with the DVD video standard is assumed as the second format.

  Details of the DVD video recording standard are described in “DVD Video Recording Standard Part 3 Video Recording September 1999”, and details of the DVD video standard are described in “DVD Video Standard Part 3 Video Specifications August 1996”. Details of the MPEG standard are described in “MPEG Standards ISO / IEC 13818-1 13818-2” and the like. Hereinafter, an embodiment of the present invention will be described in detail based on the drawings while using terms and the like defined in these standards.

  FIG. 1 is a schematic configuration diagram of an information recording apparatus according to the present embodiment.

  As shown in FIG. 1, the information recording apparatus of this embodiment includes an encoder 4, a stream controller 12, a host microcomputer 5, and an RDI_PCK / NV_PCK converter 6 (hereinafter abbreviated as a converter). Content can be recorded as digital data in a first format on a recording medium, and the content can be converted into a second format and recorded on the second recording medium. Note that the conversion from the first format to the second format is performed as it is without decoding the digital data. Such conversion is referred to as “digital conversion”. In the present embodiment, the following description will be given on the assumption that the hard disk 13 is used as the first recording medium and the DVD 14 is used as the second recording medium. However, what can be used as a recording medium is not limited to these combinations, and may be a combination of a hard disk and a portable recording medium other than a DVD, or a DVD-RAM may be used instead of a hard disk. Is also possible.

  Note that the information recording apparatus of the present embodiment, when recording content in the first format, if the user specifies that the content may be digitally converted to the second format later, the second The content of the first format is recorded in a state where digital conversion to the format is possible. The first format is a format in which a plurality of video object units (VOBU), which are minimum video recording units, are collected. The second format is common to the first format in that a plurality of VOBUs are assembled, but is different from the first format. “A state in which digital conversion to the second format is possible” refers to information necessary for performing digital conversion to the second format in the content of the first format (hereinafter referred to as “digital conversion information”). Is embedded in each VOBU in the stream. A flag indicating that the digital conversion information is embedded is described as a second flag in the user area in each VOBU and as a first flag in the user area in the management information. Yes. Since the digital conversion information, the first flag, and the second flag described above are information that is recorded at the time of recording in the first format only when there is a possibility of conversion to the second format, These may be collectively referred to as “digital conversion support information”.

  The encoder 4 includes an elementary stream encoder 1, an RDI_PCK generator 2, and a system encoder 3. The stream controller 12 includes a stream analyzer 7, a stream converter 8, a digital conversion correspondence information determination unit 9, a digital conversion correspondence information generator 10, and a recording / reproducing device 11. The host microcomputer 5 issues an operation instruction to the encoder 4, stream controller 12, and converter 6.

  FIG. 2 shows a directory structure of a disc on which information is recorded in the video recording standard. As shown in FIG. 2, the directory in this disc has a hierarchical structure, and a directory called DVD_RTAV is located under the ROOT directory. In this directory, VR_MANGR. IFO, VR_MOVIE. VRO, VR_STILL. VRO, VR_AUDIO. VRO, VR_MANAGER. There is a file called BUP. Although not shown in FIG. 2, many other directories and files exist under the ROOT directory.

  3 shows VR_MANGR. The structure of RTR_VMG stored in the IFO file is shown. The data string in the text data manager (TXTDT_MG) 301 in RTR_VMG is IT_TXT, and a part of this IT_TXT is used as an area for recording digital conversion correspondence information (see FIG. 4).

  In the RTR_VMG shown in FIG. 3, RTR_VMGI describes start addresses such as M_AVFIT and SAVFIT, time zones, character codes, and basic information of the recorded disc. M_AVFIT includes a moving image file VR_MOVIE. Information on VRO is described. S_AVIFT describes information about a still image file (VR_STILL.VRO) such as video and audio attributes. ORG_PGCI describes information related to the program chain such as playback start / end times, video / audio attribute search information, entry points, text information, and the like. In UD_PGCIT, information on a playlist created by the user is described. In TXTDT_MG, text information related to programs (programs) and playlists is described. This text information becomes auxiliary information of the primary text. MNFIT describes information determined by the manufacturer.

  FIG. 5 shows the structure of real-time data information (RDI_PCK) in the DVD video recording standard. RDI_PCK is a pack arranged at the head of each VOBU in the video recording standard (see FIG. 11).

  FIG. 6 shows the contents of data described in the user area in the video object unit (VOBU). As shown in FIG. 6, here, the manufacturer information area 503 in the RDI data of RDI_PCK is used as the user area.

  FIG. 7 shows a configuration example of a VOB (video object set) in the DVD video standard. As shown in FIG. 7, the VOB 601 is composed of a plurality of video objects 602 (VOB_IDNi: i is a natural number). One video object 602 is composed of a plurality of cells 603 (C_IDNj: j is a natural number). One cell 603 includes a plurality of video object units 604 (VOBU). One VOBU 604 includes an audio pack 606, a video pack 607, and a sub-picture pack 608 with a navigation pack (NV_PCK) 605 as the head.

  FIG. 8 shows the configuration of the navigation pack 605 in the DVD video standard. As shown in FIG. 8, the navigation pack 605 has a configuration in which a pack header and a system header are added to the heads of PCI_PKT and DSI_PKT. PCI_PKT includes a packet header, a substream ID, and PCI data. DSI_PKT includes a packet header, a substream ID, and DSI data.

  FIGS. 9A and 9B show the configuration of the video pack 607 in the DVD video recording standard. The video pack 607 has a different configuration between the pack at the head of the video packs existing in one VOBU and the packs thereafter. FIG. 9A shows the configuration of the leading pack, and FIG. 9B shows the configuration of the second and subsequent video packs. As shown in FIG. 9A, the video pack 607 at the head in the VOBU is obtained by adding a pack header and a system header to V_PKT. V_PKT includes a packet header and video data. As shown in FIG. 9B, the second and subsequent video packs 607 in the VOBU have the same configuration as the video pack shown in FIG. 9A, except that there is no system header.

  FIGS. 10A and 10B show the configuration of the audio pack 606 in the video recording standard. As shown in FIGS. 10A and 10B, the audio pack 606 includes a pack header and A_PKT. The format of A_PKT differs between Dolby AC3 and linear PCM. As shown in FIG. 10A, the A_PKT of Dolby AC3 includes a packet header, a substream ID, audio frame information, and audio data of Dolby AC3. As shown in FIG. 10B, the linear PCM A_PKT includes a packet header, a substream ID, audio frame information, audio data information, and linear PCM audio data.

  FIG. 11 is a diagram showing a correspondence relationship between stream formats when converting from the DVD video recording standard to the DVD video standard. FIG. 12 shows a state in which PES_EXTENSION_field is converted to a stuffing byte or padding packet when a pack having PES_EXTENSION_field is converted to the DVD video standard in the DVD video recording standard. It is a figure explaining. These drawings will be described later.

  The operation of the information recording apparatus according to this embodiment will be described below.

  When the information recording apparatus according to the present embodiment records a content such as a TV broadcast in the first format, the information recording device may digitally convert the content to a second format different from the first format later. If there is, record in “Digital Conversion Support Mode”.

  Hereinafter, a case where the first format is the DVD video recording standard and the second format is the DVD video standard will be described as an example. In this case, when the content is recorded in the DVD video recording standard, if the user can convert the content to the DVD video standard later, the information recording apparatus is set in the “digital conversion compatible mode”. Enter instructions to work.

  When the user inputs an instruction to select “digital conversion compatible mode” (the result of step S1 is YES), the host microcomputer 5 sends the information to the elementary stream encoder 1 (step S2). Next, the RDI_PCK generator 2 creates basic real-time data information (RDI_PCK) (step S3). Next, data for generating a navigation pack (NV_PCK) is transferred from the system encoder 3 to the host microcomputer 5 (step S4). Here, the data for generating the navigation pack (NV_PCK) is the first information (A_SYNCA) that is the address of the audio data, and the second information (VOBU_2NDREF_EA, VOBU_3RDREF_EA) that is the address of the video data. .

  Subsequently, the encoded data is transferred to the RDI_PCK / NV_PCK converter 6 via the stream controller 12. Here, based on the data for generating the navigation pack (NV_PCK) in the host microcomputer 5 and the management information, the RDI_PCK / NV_PCK converter 6 generates RDI_PCK including information for digital conversion (step) S5). At this time, the digital conversion correspondence information is described in an area in the video object where the user can describe the unique information. Here, the manufacturer code is described in MNF_ID in the RDI data of RDI_PCK, and the digital conversion correspondence information is described in MNFI_DT. The structure of RDI_PCK is shown in FIG. 5, and the structure of MNF_ID and MNFI_DT included in the RDI data of RDI_PCK is shown in FIG.

  Subsequently, based on an instruction from the host microcomputer 5, the digital conversion correspondence information generator 10 stores the digital conversion correspondence information (first information in the IT_TXT shown in FIG. 4) in the user area of the management information (VR_MANGR.IFO). 1 flag) is generated (step S6). Here, in the directory structure shown in FIG. 2, a real-time recording movie video (VR_MOVIE.VRO) file and a VR_AUDIO.VOD. There are a VRO file and a real-time recording still picture video (VR_STILL.VRO) file provided as a still image data file. Management information (VR_MANGR.IFO) is a management information file for managing this video data file. It is. Here, as shown in FIGS. 3 and 4, VR_MANGR.IF is an area in the management information (VR_MANGR.IFO) in which the user can describe unique information. Digital conversion correspondence information (first flag) is described in IT_TXT of TXTDT_MG in RTR_VMG constituting the IFO file.

  Next, a 1 VOBU stream is written to the hard disk 13 by the recording / reproducing device 11 (step S7). The series of processing in steps S3 to S7 is repeated until recording is stopped (until the result in step S8 becomes YES).

  If the user does not select the “digital conversion support mode” (the result of step S1 is NO), the host microcomputer 5 sends the information to the elementary stream encoder 1 (step S9). Next, the RDI_PCK generator 2 creates basic real-time data information (RDI_PCK) (step S10). Then, a 1 VOBU stream is written to the hard disk 13 by the recording / reproducing device 11 of the stream controller 12 (step S11). The above steps S10 to S11 are repeated until the recording stops (until the result of step S12 becomes YES).

  With the above procedure, after the content is recorded on the hard disk 13 in the first format (here, the DVD video recording standard) in the “digital conversion compatible mode”, the content is copied to another medium. This will be described with reference to the flowchart of FIG. Here, “duplicate” means that the content recorded in the first format remains in the first format (ie, without format conversion) and is recorded on another medium (or another record on the same medium). To copy to (area).

  First, before starting replication, the recording / reproducing device 11 reads management information from the hard disk 13 and develops it on the memory. Then, the digital conversion correspondence information generator 10 or the host microcomputer 5 writes the digital conversion correspondence information in the management information (IT_TXT) developed on the memory (step S21).

  Next, the recording / reproducing device 11 reads the stream from the hard disk 13 (step S22). Next, the stream analyzer 7 analyzes the manufacturer ID and the digital conversion correspondence information (digital conversion information and second flag) described in the user area of VOBU (here, MNFI_DT in the RDI data of RDI_PCK) ( Step S23). At this time, the stream analyzer 7 holds whether there is information that does not support digital conversion as an analysis result. This data may be retained by the host microcomputer 5. The analyzed VOBU is written to the hard disk 13 or the DVD 14 by the recording / reproducing device 11 (step 24). Here, the recording medium into which the analyzed data is written may be a recording medium different from the recording medium from which the data is read, or the same recording medium. The processes of steps S22 to S24 are repeated until the analysis on the final VOBU of the stream is completed (until the result of step S25 becomes YES).

  If it is determined from the analysis result of the stream analyzer 7 in step S23 that there is even one VOBU without digital conversion correspondence information (digital conversion information and second flag) in the MNFI_DT of RDI_PCK (in step S26) If the result is NO, the digital conversion correspondence information generator 10 deletes the digital conversion correspondence information (first flag) in the management information (step S27), and updates the management information (step S28). Finally, the management information is written back to the recording medium by the recording / reproducing device 11 (step S29).

  Through the above processing, even when a copy of content recorded in the DVD video recording standard compatible with digital conversion is created, it is determined whether data for digital conversion is included in the copy destination data. Whether it can be converted can be determined instantaneously.

  In the above description, if it is determined in step S26 that there is even one VOBU without digital conversion support information, the first flag in the management information is deleted in step S27. It is not necessary to check the presence / absence of digital conversion support information for all VOBUs. For example, when importance is attached to the processing speed, the presence / absence of digital conversion support information may be confirmed only for some VOBUs.

  Next, a description will be given of a process of converting the content recorded in the DVD video recording standard into the DVD video standard (digital conversion).

  In the present embodiment, as described above, when content is recorded in the first format, the presence / absence of digital conversion compatible information is recorded in the user area of the management information in that format. Therefore, by referring to this management information, it is possible to easily and quickly determine whether or not digital conversion of the content recorded in the first format is possible without performing stream analysis.

  First, the processing procedure for determining whether digital conversion is possible will be described with reference to FIG. First, management information is read by the recording / reproducing device 11 from a recording medium (in the present embodiment, the hard disk 13) in which content is recorded in the first format (step S31). Next, the digital conversion correspondence information determination unit 9 analyzes information described in the user area (here, IT_TXT of TXTDT_MG) of the management information (VR_MANGR.IFO) (step S32), and here the digital conversion correspondence information ( It is determined whether or not there is a first flag (step S33). As a result, if there is digital conversion correspondence information, it is determined that digital conversion is possible, and digital conversion processing (step S34) is executed. If there is no digital conversion correspondence information, it is determined that digital conversion is impossible. With the above processing, it is possible to determine whether the content is compatible with digital conversion without analyzing the stream.

  Next, the contents of the process in step S34 described above, that is, the procedure of the process of converting the format (digital conversion) of the content recorded in the DVD video recording standard into the DVD video standard will be described below.

  First, while explaining the difference between the DVD video recording standard and the DVD video standard, a process necessary for performing the conversion will be described. FIG. 7 shows the structure of the DVD video standard VOB. In the DVD video recording standard, the video pack (V_PCK) 607, the audio pack (A_PCK) 606, and the sub-picture pack (SP_PCK) 608 shown in FIG. It is the same in that there is. The navigation pack (NV_PCK) 605 shown in FIG. 7 is a pack specific to the DVD video standard. In the DVD video recording standard, RDI_PCK exists at a position corresponding to this (see FIG. 11).

  FIG. 8 shows the structure of the navigation pack, FIG. 9 shows the structure of the video pack, and FIG. 10 shows the structure of the audio pack. In each pack, the type of pack can be identified by stream_id and sub_stream_id recorded in each packet header. One pack is composed of a pack header and one or more packets, and the length of the pack is 2048 bytes.

  Here, the conversion process from the DVD video recording standard to the DVD video standard is roughly divided into (1) a process of converting RDI_PCK to NV_PCK and (2) a format of each pack of RDI_PCK, V_PCK, A_PCK, and SP_PCK It is divided into the process to convert.

  In order to convert RDI_PCK to NV_PCK, first, digital conversion information recorded in RDI data of RDI_PCK, that is, first information (A_SYNCA) that is an address of audio data, and second that is an address of video data. Information (VOBU_2NDREF_EA, VOBU_3RDREF_EA), M_AVFIT (Movie AV File Information Table) information of management information, and ORG_PGCI (Original PGC Information) information are used to create navigation.

  Regarding the format conversion process of each pack in (2) above, there is a time stamp SCR (System Clock Reference) in the pack header of each pack, but in the DVD video standard, RDI_PCK arranged in the first VOBU of the VOB. The time stamp SCR (System Clock Reference) must be set to 0. This definition is not provided in the DVD video recording standard, and this subtraction process must be performed when converting from the DVD video recording standard to the DVD video standard. Further, similarly for PTS and DTS, it is necessary to subtract the value corresponding to the subtraction of SCR.

  Next, as necessary conversion processing, there is PES_EXTENSION_field deletion processing. This process will be described based on FIG. 11 and FIG. In the DVD video recording standard, as shown in FIG. 11, PES_EXTENSION_field exists in all VOBUs. On the other hand, in the DVD video recording standard, there must be no PES_EXTENSION_field other than the first video, audio, and sub-picture pack in the VOB. Therefore, processing for deleting PES_EXTENSION_field from the pack other than the top video, audio, and sub-picture of this VOB is performed. This processing is realized by stuffing bytes and padding packets as shown in FIGS. 12 (a) and 12 (b).

  The stuffing byteization of PES_EXTENSION_field is a process of converting the data of PES_EXTENSION_field into size adjustment data, as shown in FIG. Also, the padding packetization of PES_EXTENSION_field is a process of deleting the data of PES_EXTENSION_field and adding a padding packet immediately after the packet data, as shown in FIG.

  The next necessary conversion process is changing the audio frame number. FIG. 10 shows the configuration of the audio pack. In the DVD video standard, when the audio recording method is linear PCM, the audio frame number must always start from 0 and must be a numerical value up to 19. is there. Since the DVD video recording standard does not have this restriction, rewriting processing of the audio frame number is necessary at the time of conversion.

  The processing necessary for converting the content recorded in the DVD video recording standard to the DVD video standard has been described above. However, the content recorded in the DVD video recording standard and subjected to editing processing such as division is processed in the DVD video standard. In the case of conversion to, there is a problem that the first B picture of the first VOBU of the VOB tries to refer to the previous I or P picture deleted by editing. In order to avoid this problem, when editing processing such as division is performed, the forward reference of the first B picture is prohibited by changing the value of the broken link (BrokenLINK) of the GOP layer of the first VOBU to 1. It is preferable to perform the process of. With this processing, even when content recorded in the DVD video recording standard is subjected to editing processing such as division, it is possible to perform digital conversion to the DVD video standard.

  Note that it is preferable to perform the above-described NV_PCK creation and stream processing separately, because the conversion can be speeded up. In the present embodiment, the processing procedure according to this preferred embodiment will be described based on the flowchart of FIG. Here, the processing of one VOB will be described.

  First, the stream is read from the hard disk 13 by the recording / reproducing device 11 (step S41). Subsequently, N VOBUs are read from the stream converter 8 to the RDI_PCK / NV_PCK converter 6 (step S42). If the read VOBU is the first VOBU of the VOB (the result of step S43 is YES), the SCR value of RDI_PCK at the beginning of the VOBU is acquired and transferred to the stream converter 8 (step S44).

  Subsequently, in the RDI_PCK / NV_PCK converter 6, first information (A_SYNCA) which is an address of audio data for NV_PCK generation obtained by the host microcomputer 5 from the system encoder 3 and second information which is an address of video data. (VBU_2NDREF_EA, VOBU_3RDREF_EA), M_AVFIT (Movie AV File Information Table) information of management information, and ORG_PGCI (Original PGC Information) information based on RDI_K based on RPC_K. When the conversion from RDI_PCK to NV_PCK is completed, the converted stream is transferred to the stream converter 8 (step S46). Next, the recording / reproducing device 11 is set to record the converted stream on the DVD 14 (step S47).

  Here, after setting for recording (step S47), the RDI_PCK / NV_PCK converter 6 returns to step S42, newly acquires data from the stream converter 8, and performs processing for generating NV_PCK. (Steps S42 to S47) are repeated. In the present embodiment, in parallel with this, the stream converter 8 starts processing for stream processing (steps S51 to S54).

  First, the SCR value acquired from the RDI_PCK of the first VOBU is set to the stream converter 8 as an initial setting for conversion (step S51). Next, the stream converter 8 performs stream processing (step S52). In step S52, as described in the first embodiment, SCR subtraction processing, PTS subtraction processing, DTS subtraction processing, PES_EXTENSION_field deletion, audio frame number setting, and broken link setting to 1. . Here, with respect to the subtraction of the SCR, a process of subtracting the actual value by the value set in the initial setting is performed. Further, PTS and DTS are subtracted by the value set in the SCR subtraction process. Further, regarding the deletion of PES_EXTENSION_field, everything except the head VOBU of the VOB is deleted by stuffing byteization or padding packetization. In addition, the audio frame number is changed so that it returns to 0 when 0 to 19 is used by using a counter in which the first value of VOBU is 0 and the maximum is 19. Further, for the broken link, it is determined whether or not the PG is edited. If the PG is edited, the broken link is changed to 1.

  As soon as the above stream processing is completed, the stream is written on the DVD 14 by the recording / reproducing device 11 (step S53). Here, when writing to a recording medium such as a DVD, writing processing in a certain unit is required, but each functional block in the stream controller 12 (stream analyzer 7, stream converter 8, digital The conversion correspondence information determination unit 9, the digital conversion correspondence information generator 10, the recording / reproducing unit 11), and the RDI_PCK / NV_PCK converter 6 only need to have buffers such as SDRAM and SRAM for storing sufficient information. In addition, it is assumed that data transfer between the respective functional blocks in the stream controller 12 can be performed at a very high speed, and the data subjected to each processing can be stored in the buffer unit of each block. In addition, this function can be realized even in a configuration in which each block has a minimum capacity buffer and the stream controller 12 has a large capacity buffer. By repeatedly performing the above processing, it is possible to convert from the DVD video recording standard to the DVD video standard format at high speed.

  As described above, according to the procedure shown in FIG. 16, when digitally converting the content in the format recorded in the DVD video recording standard into the DVD video standard format, the navigation information (NV_PCK) is created and the stream is converted. By performing two processes in parallel, format conversion can be performed at high speed.

  ADVANTAGE OF THE INVENTION According to this invention, the information recording device which can determine immediately before conversion whether the content recorded by the 1st format can be converted to a 2nd format can be provided.

Format conversion signal processing configuration diagram according to the embodiment of the present invention The figure which showed the file structure in DVD video recording standard for demonstrating VR_MANGER in the embodiment VR_MANGR. The figure which shows the structure of RTR_VMG stored in the IFO file The figure which shows the information for the digital conversion contained in management information (VR_MANAGER.IFO) in the embodiment The figure shown in order to demonstrate the detailed structure of RDI_PCK in the embodiment The figure shown in order to demonstrate the attribute information (manufacturers information) in RDI_PCK in the embodiment The figure shown in order to demonstrate the structure of the VOB of the video standard in the embodiment The figure shown in order to demonstrate the structure of NV_PCK (navigation pack) in the embodiment The figure shown in order to demonstrate the structure of V_PCK (video pack) in the embodiment The figure shown in order to demonstrate the structure of A_PCK (audio pack) in the embodiment The figure which shows each corresponding pack figure at the time of converting the stream of the DVD video recording standard in the same embodiment into the stream of a DVD video standard Invalidation diagram of PES_EXTENSION_field in the same embodiment The figure shown in order to demonstrate the operation | movement at the time of recording in the digital conversion corresponding | compatible mode in the embodiment The figure shown in order to demonstrate the operation | movement at the time of duplicating the stream recorded in the digital conversion corresponding | compatible mode between different media in the embodiment The figure shown in order to demonstrate the digital conversion possibility determination method in the embodiment The figure shown in order to demonstrate the operation | movement at the time of digital-converting the stream corresponding to digital conversion for 1 VOB in the embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elementary stream encoder 2 RDI_PCK generator 3 System encoder 4 Encoder 5 Host microcomputer 6 RDI_PCK / NV_PCK converter 7 Stream analyzer 8 Stream converter 9 Digital conversion correspondence information determination device 10 Digital conversion correspondence information generator 11 Recording / reproduction device 12 Stream controller 13 Hard disk 14 DVD
501 MNF_ID of DVDDI video recording standard RDI_PCK
502 Manufacturer information to be recorded in MNF_ID 503 MNF_IT of RDI_PCK of DVD video recording standard
504 Digital conversion correspondence information described in MNF_IT 505 Other information recorded in MNF_IT

Claims (14)

Digital data of a first format composed of a plurality of video object units which are minimum video recording units, and the first format composed of a plurality of video object units which are minimum video recording units. Is an input unit for inputting information indicating whether or not there is a possibility of converting digital data as it is without decoding into digital data of a different second format;
An encoder that compresses and encodes AV data to generate digital data in the first format, and outputs digital conversion information necessary for converting the data in the first format into data in the second format as it is. When,
When the information input by the input unit represents the possibility of conversion to the second format, the digital conversion information is recorded when recording the digital data of the first format on a recording medium. Is recorded in the user area in the video object unit, and a first flag indicating that the digital conversion information is included in the digital data in the first format is recorded in the user area in the management information; An information recording apparatus comprising: When there is a possibility of the conversion, when recording digital data on the recording medium in the first format,
The information according to claim 1, wherein the recording unit describes a second flag indicating that digital conversion information is included in each video object unit in a user area in the video object unit including the digital conversion information. Recording device. A digital conversion correspondence information determination unit that analyzes whether or not the second flag exists in the user area in the video object unit;
A replication unit that creates a copy of the data in the first format recorded on the assumption that the data in the second format may be converted into digital data as it is;
When the copy unit creates a copy of data in the first format, when the digital conversion correspondence information determination unit determines that the second flag is in the user area in the video object unit, the recording unit The information recording apparatus according to claim 2, wherein the first flag is written in a user area in the management information of the copy destination. A digital conversion availability determination unit that determines whether or not conversion is possible with digital data with reference to the first flag when converting from the first format to the second format. Item 1. An information recording apparatus according to Item 1. Digital data of a first format composed of a plurality of video object units which are minimum video recording units, and the first format composed of a plurality of video object units which are minimum video recording units. Is an information recording device for converting digital data as it is without decoding into digital data of a different second format,
Digital conversion necessary for the video object unit of the first format to convert the first time stamp information, the first pack, and the data of the first format into the data of the second format as digital data. The video object unit in the second format includes second time stamp information and a second pack;
The information recording device includes:
A time stamp conversion unit for converting the first time stamp information into the second time stamp information based on the digital conversion information;
A pack conversion unit that converts the first pack into the second pack based on the digital conversion information;
An information recording apparatus characterized in that the time stamp conversion unit and the pack conversion unit operate in parallel when converting digital data as it is from the first format to the second format. When the data in the first format is edited and the edited data is converted into data in the second format, forward reference from the first video object unit of the edited data is prohibited. The information recording apparatus according to claim 5, further comprising a recording unit that describes the third flag in the video object unit. The information recording apparatus according to claim 1, wherein the first format is a format compliant with the DVD video recording standard, and the second format is a format compliant with the DVD video standard. A recording medium on which digital data of a first format composed of a plurality of video object units, which are minimum video recording units, is recorded,
In order to convert the first format into digital data of a second format different from the first format, which is composed of a plurality of video object units that are minimum video recording units. Necessary digital conversion information is described in the user area in the video object unit,
An information recording medium characterized in that a first flag indicating that the digital conversion information is included in digital data of a first format is described in a user area in management information. 9. The information recording medium according to claim 8, wherein a second flag indicating that each video object unit includes digital conversion information is described in a user area in each video object unit. A format conversion unit that reads digital data of a first format from the information recording medium according to claim 8 and converts the digital data into digital data of a second format and records the data,
In the information recording medium, whether or not conversion from the first format to the second format is possible as it is based on whether or not the first flag is described in the user area in the management information. An information recording apparatus comprising: a digital conversion availability determination unit for determining. An information recording apparatus that reads digital data of a first format from the information recording medium according to claim 8 or 9, converts the digital data to a digital data of a second format, and records the data.
The video object unit of the first format includes first time stamp information and a first pack, and the video object unit of the second format includes second time stamp information and a second pack. Including
The information recording device includes:
A time stamp conversion unit that converts the first time stamp information into the second time stamp information based on the digital conversion information;
A pack conversion unit that converts the first pack into the second pack based on the digital conversion information;
An information recording apparatus, wherein the time stamp conversion unit and the pack conversion unit operate in parallel when converting digital data as it is from the first format to the second format. When the data of the first format has been edited, a recording unit that further describes a third flag for prohibiting forward reference from the first video object unit of the edited data in the video object unit. The information recording device according to claim 10 or 11, comprising the information recording device. A copy unit that reads digital data in a first format from the information recording medium according to claim 9 and creates a copy in the first format;
A digital conversion correspondence information determination unit that analyzes whether or not the second flag exists in the user area in the video object unit;
When the copy unit creates a copy of the data in the first format, if the digital conversion correspondence information determining unit determines that the second flag exists in the user area in the video object unit, the copy destination An information recording apparatus comprising: a recording unit that describes a first flag in a user area in the management information. The information recording apparatus according to claim 10, wherein the first format is a format compliant with the DVD video recording standard, and the second format is a format compliant with the DVD video standard.

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