JP2013198044A - Video/sound recording and reproducing apparatus and video/sound recording and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten time required until a reproduced video sound signal is outputted after a user performs a reproduction start operation and to provide a comfortable operation response to the user.SOLUTION: A video signal recording and reproducing apparatus 1 includes: a demultiplexer 13 for separating a video stream and a sound stream from a program stream kept in HDD 11 ; and a non-volatile semiconductor memory 18 whose access speed is faster than the HDD. When a reproduction controller 21 receives a reproduction start instruction, it sets the video stream and the sound stream, which are supplied to a video decoder 15 and a sound decoder 17, to a video stream and a sound stream, which are kept in the non-volatile semiconductor memory 18 at first, and switches them to a video stream and a sound stream, which temporally continue to the video stream and the sound stream, which correspond to the program stream kept in the non-volatile semiconductor memory 18, and to the video stream and the sound stream, which are kept in the HDD 11.

Description

  The present invention relates to a video / audio recording / reproducing apparatus and a video / audio recording / reproducing method for generating a video signal and an audio signal from a program stream.

  Optical discs such as DVDs and Blu-ray discs are mainly used as storage media for digitally compressed video and audio package software. Since the optical disc takes a long time to start reading data, the time (waiting time) required until the reproduction is actually started after the user gives an instruction to start the reproduction becomes long.

  Digital broadcast programs are often recorded on the HDD, but the time required to start reading data from the HDD is longer than the time required for a semiconductor memory that does not require a physical mechanism. Generally, it takes several seconds for a program on the HDD and ten or more seconds for a program on an optical disk until the playback video / audio signal is output after the user performs a playback operation. ing.

  For example, Patent Document 1 proposes a countermeasure for reducing the time required to output the reproduced video / audio signal. In Patent Document 1, a part of a program recorded on an optical disk is held in an HDD with faster access, and when a user starts a reproduction start operation, the program recorded on the HDD is first reproduced, and then Discloses a technique for switching to playback from a program recorded on an optical disc.

JP 2007-12132 A

  However, in the technique disclosed in Patent Document 1, in order to output a playback video / audio signal, analysis of the structure of a program recorded in the HDD, acquisition of program configuration information by the demultiplexer, and video stream to be separated by the demultiplexer And audio stream setting, separation of video and audio streams by a demultiplexer, decoder setting, and decoding of video and audio signals by a decoder. There is a problem that it takes a long time to output a signal.

  Accordingly, an object of the present invention is to shorten the time required from when a user performs a playback start operation until a playback video / audio signal is output, and to provide a comfortable operation response to the user.

  The video / audio recording and reproducing apparatus according to the present invention includes a first holding unit that holds a program stream and outputs the held program stream, and a video stream from the program stream that is output from the first holding unit. A program stream separating unit that separates an audio stream and an access speed higher than that of the first holding unit, and a video stream and an audio stream separated by the program stream separating unit, corresponding to a specific part of the program stream A second holding unit for holding a portion to perform, a video signal decoding unit for decoding the video stream and converting it into a video signal, an audio signal decoding unit for decoding the audio stream and converting it into an audio signal, and a user instruction An operation unit that receives the image data, and a reproduction control unit that controls the first holding unit, the program stream separation unit, and the second holding unit. Then, when the playback control unit receives a user instruction to start playback of the program stream held in the first holding unit from the operation unit, the playback control unit sends the video signal decoding unit and the audio signal decoding unit The supplied video stream and audio stream are first set to the video stream and audio stream held in the second holding unit, and then the video stream and audio held in the second holding unit. A video stream and an audio stream that are temporally continuous with the stream are switched to a video stream and an audio stream based on the program stream held in the first holding unit.

  A video / audio recording / reproducing method according to the present invention is a video signal recording / reproducing method executed by a video signal recording / reproducing apparatus, wherein a program stream is held in a first holding unit and the held program stream is output. A step of separating a video stream and an audio stream from the program stream output from the first holding unit, and a second holding unit having an access speed higher than that of the first holding unit. A video stream and an audio stream separated by a separation unit, the step of retaining a part corresponding to a specific part of the program stream; the video stream is decoded and converted into a video signal; and the audio stream is decoded And converting the audio signal into an audio signal, and the video signal recording / reproducing apparatus is held in the first holding unit. When the user instruction to start playback of the program stream is received, the video stream to be decoded and converted to a video signal and the audio stream to be decoded and converted to an audio signal are stored in the second holding unit. The video stream and audio stream that are held are set, and then the video stream that is decoded and converted into a video signal and the audio stream that is decoded and converted into an audio signal are held in the second holding unit A video stream and an audio stream that are temporally continuous to the video stream and the audio stream that are recorded, and are switched to a video stream and an audio stream based on the program stream held in the first holding unit. .

  According to the present invention, the video stream and the audio stream separated from the program stream, the part corresponding to the specific part of the program stream being held in the second holding unit in advance, Since the video stream and the audio stream are read from the holding unit and playback is started, the time required from the playback start operation to the output of the playback video / audio signal can be reduced. For this reason, a comfortable operation response can be provided to the user.

1 is a block diagram schematically showing a configuration of a video / audio recording / reproducing apparatus according to Embodiment 1. FIG. It is a figure which shows the structure of TS packet. It is a figure which shows the structure of PAT. It is a figure which shows the structure of PMT. It is a figure which shows the relationship between a PES packet and a TS packet. It is a figure which shows the structure of a PES header. It is a figure which shows the structure of the video stream accumulate | stored in a video decoder buffer. It is a figure which shows the structure of the audio | voice stream accumulate | stored in an audio | voice decoder buffer. It is a figure which shows the structure of the holding | maintenance program reproduction | regeneration information currently recorded on the non-volatile semiconductor memory. It is a figure which shows the structure of holding | maintenance program information. It is a figure which shows the structure of holding | maintenance stream data. 5 is a flowchart showing a program recording process in the video / audio recording / reproducing apparatus according to the first embodiment. It is a flowchart which shows the buffer filling process shown by FIG. It is a flowchart which shows the holding | maintenance program information saving process shown by FIG. 4 is a flowchart showing a reproduction start process in the video / audio recording / reproducing apparatus according to the first embodiment. It is a flowchart which shows the holding | maintenance program information loading process shown by FIG. It is a flowchart which shows the discontinuity detection process shown by FIG. It is a figure which shows the relationship between the video stream at the time of reproduction | regeneration start, an audio | voice stream, and a program stream. 6 is a flowchart showing playback stop processing in the video / audio recording and playback device according to Embodiment 1; FIG. 20 is a flowchart showing a stream analysis process shown in FIG. 19. FIG. FIG. 10 is a diagram showing a configuration of retained program information in a video / audio recording / reproducing apparatus according to Embodiment 2. 10 is a flowchart showing buffer filling processing in the video / audio recording / reproducing apparatus according to Embodiment 2; It is a flowchart which shows the discontinuity detection process shown by FIG. 6 is a flowchart showing playback stop processing in the video / audio recording and playback device according to Embodiment 2; 10 is a flowchart showing a reproduction start process in the video / audio recording / reproducing apparatus according to the second embodiment. 10 is a flowchart showing buffer filling processing in the video / audio recording / reproducing apparatus according to Embodiment 2; 10 is a flowchart showing a program configuration change confirmation process in the video / audio recording / reproducing apparatus according to the second embodiment. 10 is a flowchart showing a discontinuous point recording process in the video / audio recording / reproducing apparatus according to the second embodiment. 10 is a flowchart showing change point confirmation processing during reproduction in the video / audio recording / reproducing apparatus according to Embodiment 2;

<< 1 >> Embodiment 1
<< 1-1 >> Configuration of Embodiment 1 FIG. 1 is a block diagram schematically showing the configuration of a video / audio recording / reproducing apparatus 1 according to Embodiment 1 of the present invention. The video / audio recording / reproducing apparatus 1 is an apparatus capable of performing the video / audio recording / reproducing method according to the first embodiment. As shown in FIG. 1, the video / audio recording / reproducing apparatus 1 includes a hard disk drive (HDD) 11 as a first holding unit, a stream buffer 12, a demultiplexer 13 as a program stream separating unit, and a video stream temporary holding unit. Video decoder buffer 14, video decoder 15 as a video signal decoder, audio decoder buffer 16, and audio decoder 17 as an audio signal decoder. In addition, the video / audio recording / reproducing apparatus 1 includes a nonvolatile semiconductor memory 18 as a second holding unit, a decoder buffer controller 19, a stream parser 20, a reproduction controller 21 as a reproduction control unit, and an operation unit 22. .

  The video / audio recording / reproducing apparatus 1 includes an interface (not shown in FIG. 1) for recording a program (program data) encoded in the MPEG2-TS (transport stream) format. A program stream supplied from the device is recorded in the HDD 11. The video signal and the audio signal reproduced by the video / audio recording / reproducing apparatus 1 are output to a display device having a screen and a speaker such as a television. The video / audio recording / playback apparatus according to the first embodiment may be a television with a recording / playback function including a screen for video display and a speaker for audio output.

  The HDD 11 records an externally input program, and outputs a program stream based on the recorded program in accordance with an instruction from the playback controller 21. As will be described later (see FIG. 5 described later), the program stream output from the HDD 11 is composed of a TS packet sequence in which a plurality of TS packets are connected.

  The stream buffer 12 temporarily holds the program stream read from the HDD 11. The stream buffer 12 outputs the held program stream to the demultiplexer 13 in accordance with an instruction from the playback controller 21.

  The demultiplexer 13 analyzes the program stream output from the stream buffer 12 and separates the program stream into information indicating a program configuration, a video stream, and an audio stream. The content of the information indicating the program structure and the reference clock information accompanying it are notified to the reproduction controller 21. The video stream and audio stream separated by the demultiplexer 13 are input to the video decoder buffer 14 and the audio decoder buffer 16, respectively.

  The video decoder buffer 14 temporarily holds the video stream and outputs the held video stream to the video decoder 15 according to an instruction from the playback controller 21. The latest write address to which the video stream from the demultiplexer 13 has been written and the latest read address to be output to the video decoder 15 are referred to by the decoder buffer controller 19 and the playback controller 21. The video stream in the video decoder buffer 14 is referenced from the stream parser 20. In addition, the video decoder buffer 14 is connected to the nonvolatile semiconductor memory 18, and the video stream in the buffer is output to the nonvolatile semiconductor memory 18 in response to an instruction from the decoder buffer controller 19, or the nonvolatile semiconductor memory 18. A video stream is input from. Note that the video decoder buffer 14 has, for example, a ring buffer configuration in which the tail and the head of the buffer are logically connected.

  The video decoder 15 receives the video stream output from the video decoder buffer 14. In accordance with an instruction from the playback controller 21, the video decoder 15 decodes the input video stream so as to match the signal output time described in the video stream, and outputs a video signal.

  The audio decoder buffer 16 temporarily holds the audio stream, and outputs the held audio stream to the audio decoder 17 in accordance with an instruction from the playback controller 21. The latest write address to which the audio stream from the demultiplexer 13 has been written and the latest read address to be output to the audio decoder 17 are referred to by the decoder buffer controller 19 and the reproduction controller 21. The audio stream in the audio decoder buffer 16 is referenced from the stream parser 20. In addition, the audio decoder buffer 16 is connected to the non-volatile semiconductor memory 18, and an audio stream in the buffer is output to the non-volatile semiconductor memory 18 in response to an instruction from the decoder buffer controller 19. An audio stream is input from. Note that the audio decoder buffer 16 has, for example, a ring buffer configuration in which the end and the beginning of the buffer are logically connected.

  The audio decoder 17 receives the audio stream output from the audio decoder buffer 16. The audio decoder 17 decodes the input audio stream so as to match the signal output time described in the audio stream in accordance with an instruction from the playback controller 21, and outputs an audio signal.

  The nonvolatile semiconductor memory 18 is connected to the video decoder buffer 14 and the audio decoder buffer 16, and a video stream and an audio stream can be input / output between them. Unlike the HDD 11, the nonvolatile semiconductor memory 18 does not have a mechanical mechanism used for reading and writing data. Therefore, the nonvolatile semiconductor memory 18 is accessed faster than the HDD 11, and the waiting time required from the start of access to data input / output is HDD 11. It is shorter than the waiting time. The nonvolatile semiconductor memory 18 records the video stream from the video decoder buffer 14 or outputs the video stream to the video decoder buffer 14 in accordance with an instruction from the decoder buffer controller 19. Similarly, the nonvolatile semiconductor memory 18 receives an instruction from the decoder buffer controller 19, records the audio stream from the audio decoder buffer 16, and outputs it to the audio decoder buffer 16. Further, according to an instruction from the reproduction controller 21, recording and reading are performed for retained program information to be described later.

  The decoder buffer controller 19 records the video stream temporarily held in the video decoder buffer 14 in the nonvolatile semiconductor memory 18 and reads the video stream from the nonvolatile semiconductor memory 18. Similarly, the decoder buffer controller 19 records the audio stream temporarily held in the audio decoder buffer 16 in the non-volatile semiconductor memory 18 and reads out from the non-volatile semiconductor memory 18. The recording and reading timings are determined according to instructions from the playback controller 21.

  The stream parser 20 analyzes the video stream in the video decoder buffer 14 and the audio stream in the audio decoder buffer 16 in accordance with an instruction from the playback controller 21. The analysis result by the stream parser 20 is notified to the playback controller 21.

  The playback controller 21 performs playback control of the video / audio recording / playback apparatus 1. In the first embodiment, the stream parser 20 is prepared as an independent stream analysis unit here, but is included in the video decoder 15 and the audio decoder 17 instead of the stream parser 20 and is used for decoding. A stream analysis unit may be provided.

  Next, the program stream temporarily held in the stream buffer 12 will be described. As described above, the program stream is composed of a TS packet sequence in which a plurality of TS packets are connected. FIG. 2 is a diagram illustrating the structure of a TS packet. As shown in FIG. 2, the TS packet is composed of a TS header, TS application information, and TS data.

  As shown in FIG. 2, the TS header includes a TS synchronization word, a PID (packet identifier), a clock information flag, clock information, TS control information A, and TS control information B. The TS synchronization word is a fixed value “47” (hexadecimal notation) indicating the head of the TS packet. The PID is an identification ID used to extract specific data from a TS packet sequence in which various data are multiplexed. PIDs can be assigned arbitrarily, but there are also PIDs reserved in advance. For example, “PID = 0” indicates that the TS data portion is a PAT (Program Association Table).

  As shown in FIG. 2, the TS application information includes a clock information flag, clock information, TS control information C, and TS control information D. The clock information flag is a flag indicating whether or not clock information is included in the TS packet. The clock information as a component of the TS application information is a field that exists when the clock information flag is “present”, and a counter value of 27 MHz clock is set. This value is used for the purpose of correcting the system clock that serves as a reference for reproduction. For TS control information A, B, C, and D, control information related to TS packets is described.

  FIG. 3 is a diagram illustrating the configuration of the PAT. The PAT plays a role of providing information for reproducing how many programs are included in the program stream. As shown in FIG. 3, the PAT has a configuration in which PAT control information and one or more PMT_PID information are connected. The number of PMT_PID represents the number of programs stored in the program stream. In the PAT control information, information related to the PAT is described. The number of PMT_PIDs can be determined from the PAT control information. The PMT_PID information includes a program number, a reserved area, and PMT_PID.

  FIG. 4 is a diagram illustrating a configuration of a PMT (Program Map Table). The PMT plays a role of providing information about a video stream, an audio stream, and a clock used for reproduction that constitute the program. As shown in FIG. 4, the PMT includes PMT control information A, clock PID, PMT control information B, and one or more stream PID information. The PMT control information describes information related to the PMT, and the number of stream PID information included in the PMT can also be determined from the PMT control information. The clock PID indicates which PID of a plurality of PIDs having clock reference information that is a reference for reproducing the program. As shown in FIG. 4, the stream PID information includes a stream type, a reserved area, a stream PID, and stream information. The stream type represents a stream type such as whether the stream represented by the stream PID is a video stream or an audio stream. By referring to this stream PID information, it is possible to know which PID is the video stream or audio stream constituting the program. The stream information provides information attached to the stream.

  FIG. 5 is a diagram illustrating a relationship between a PES (Packetized Elementary Stream) packet and a TS packet. By acquiring necessary information from the PAT and PMT, it is possible to know the value of the PID in which a specific video stream or audio stream of a specific program is stored. If this PID value is known, a specific stream can be extracted. For example, when TS packets of a video stream represented by PID = N are extracted from the TS packet sequence and connected in order, a PES packet stream as shown in FIG. 5 is obtained. There are also packets with PID = M in the TS packet sequence, but since TS packets with only PID = N are extracted, there is no problem even if TS packets having PID values other than PID = N are multiplexed. The PES packet is composed of a PES header and PES data. Detection of PAT and PMT, and filtering from TS packets to PES packets are performed by the demultiplexer 13.

  FIG. 6 is a diagram illustrating the configuration of the PES header. As shown in FIG. 6, the PES header includes a PES start word, PES control information A, display time information flag, PES control information B, display time information, and PES control information C. In the PES control information, information related to the PES packet is described. The display time information flag is a flag indicating whether or not display time information is included in the PES packet. The display time information, which is a constituent element of the PES header, is timing information for outputting the video and audio included in the PES packet. If the video is output according to the time information specified here, the video and audio are synchronized. Can do.

  FIG. 7 is a diagram illustrating a configuration of a video stream stored in the video decoder buffer 14. As shown in FIG. 7, the video stream has a configuration in which PES packets including a PES header and PES data are connected. When only the PES data is extracted from the video stream, the video access unit is connected. When compressing a video signal, the amount of code is reduced by using correlation between pictures, so the compressed video data cannot be decoded from any position and can be decoded independently. Decoding can only be started from a correct picture (I picture). Therefore, a plurality of continuous videos starting from the I picture are grouped to form a video access unit. As shown in FIG. 7, the video access unit includes a video header and video data. As shown in FIG. 7, the video header includes a video synchronization word and video attribute information. The video synchronization word is a fixed value and is composed of 4 bytes of “000001B3” in hexadecimal notation. By finding this video synchronization word, the head of the video access unit can be known.

  FIG. 8 is a diagram showing a configuration of an audio stream stored in the audio decoder buffer 16. Similar to the video stream, the audio stream has a configuration in which a plurality of PES packets are connected. If only PES data is extracted from here, a configuration in which voice access units are connected is obtained. As shown in FIG. 8, the voice access unit includes a voice header and voice data. The voice header is composed of a voice synchronization word and voice attribute information. The voice synchronization word is a fixed value and is composed of 13 bits of “1111111111111” in binary notation. By finding this voice synchronization word, the head of the voice access unit can be known.

  FIG. 9 is a diagram showing a configuration of retained program reproduction information recorded in the nonvolatile semiconductor memory 18. As shown in FIG. 9, the retained program reproduction information is roughly divided into a program management area and a retained stream area. In the program management area, the number of retained programs indicating the number of effective programs that are the management target of retained program reproduction information and N retained program information in which information on each retained program is described are arranged. In the holding stream area, N pieces of holding stream data are recorded. The retained program information and the retained stream data are linked. For example, retained program information # 2 and retained stream data # 2 are information relating to the same program.

  FIG. 10 is a diagram showing the configuration of the retained program information PI1. As shown in FIG. 10, the retained program information PI1 can be broadly divided into a program ID, head reproduction information, and resume reproduction information. The program ID is an ID unique to the program assigned to the program held in the HDD 11, and plays a role of linking the program managed by the HDD 11 and the program managed by the held program reproduction information using this program ID. Have. There are two types of playback information, beginning playback and resume playback, in order to support not only playback from the beginning, but also resume playback that stops playback after halfway playback and restarts playback from this stop position. It is.

  As shown in FIG. 10, the head playback information includes the head playback read position, head PAT data length, head PMT data length, head video stream length, head audio stream length, head reference counter value, head PAT data, and head PMT. Consists of data. The head playback read position is the program read position (number of TS packets from the head) recorded in the HDD 11 at the time of head playback, the head PAT data length is the number of bytes of the head PAT data, and the head PMT. The data length is the number of bytes of the head PMT data, and the head video stream length is the number of bytes of the video stream at the head of the program recorded in the holding stream area. The head audio stream length is the number of bytes of the audio stream of the head portion of the program recorded in the holding stream area, the head reference counter value is the value of the system clock counter to be set at the start of playback, and the head PAT data Is the PAT at the start of playback, and the top PMT data is the PMT at the start of playback.

  As shown in FIG. 10, the resume playback information includes the resume playback read position, the resume PAT data length, the resume PMT data length, the resume video stream length, the resume audio stream length, the resume reference counter value, the resume PAT data, and the resume PMT. Consists of data. The resume playback read position is the read position (number of TS packets from the beginning) of the program recorded in the HDD 11 when resume playback is performed, the resume PAT data length is the number of bytes of the resume PAT data, and the resume PMT The data length is the number of bytes of the resume PMT data, the resume video stream length is the number of bytes of the video stream from the resume playback start point of the program recorded in the retained stream area, and the head audio stream length is retained. This is the number of bytes of the audio stream from the resume playback start point of the program recorded in the stream area. The resume reference counter value is the value of the system clock counter to be set at the start of resume playback, the resume PAT data is the PAT at the start of resume playback, and the resume PMT data is the PMT at the start of resume playback.

  FIG. 11 is a diagram illustrating a configuration of retained stream data. As illustrated in FIG. 11, the retained stream data includes a head video stream, a head audio stream, a resume video stream, and a resume audio stream. The lengths of these streams are represented by the head video stream length, the head audio stream length, the resume video stream length, and the resume audio stream length recorded in the above-described retained program information.

<< 1-2 >> Operation of the first embodiment [program recording process]
Next, an operation when a program is recorded on the HDD 11 will be described. FIG. 12 is a flowchart showing a program recording process in the video / audio recording / reproducing apparatus 1 according to the first embodiment. The playback controller 21 mainly controls the program recording process.

  First, in step S <b> 101, the reproduction controller 21 checks an empty area of retained program reproduction information managed by the nonvolatile semiconductor memory 18. If it is determined that there is an area for recording a new program, the process proceeds to step S102. If not, the process ends.

  In FIG. 12, the processing loop from step S102 to step S105 or the processing loop from step S102 to step S107 is periodically repeated. For example, this processing loop is executed after the reception data of the program from the outside reaches a predetermined amount set in advance or after a predetermined time has passed.

  In step S <b> 102, the playback controller 21 checks the free area of the HDD 11. If it is determined that there is an area for recording a program, the process proceeds to step S103, and if not, the process ends.

  In step S103, the playback controller 21 determines whether an external program is received. If it is determined that the program is received, the process proceeds to step S104. If not (the program from the outside cannot be received), the process ends.

  In step S104, the playback controller 21 causes the HDD 11 to record the received program stream.

  In step S105, the playback controller 21 checks whether or not the video and audio streams are completely filled in the video decoder buffer 14 and the audio decoder buffer 16. If the filling process is not completed, the process proceeds to step S106. If the filling process is completed, the process returns to step S102.

  In step S106, the playback controller 21 transfers the program stream from the HDD 11 to the stream buffer 12. After the transfer, the reproduction controller 21 checks in step S107 whether the buffer filling process has been started. If not started yet, the process proceeds to step S108 to start the buffer filling process. If the buffer filling process has been started in step S107, the process returns to step S102.

  The playback controller 21 repeats the above processing, and when it is determined in step S102 that there is no free space in the HDD 11, or when it is recognized in step S103 that reception of an external program has ended, the program recording processing ends. To do.

[Buffer filling process]
FIG. 13 is a flowchart showing details of the buffer filling process S108 shown in FIG. First, in step S111, the playback controller 21 checks whether or not there is a program stream in the stream buffer 12. If there is no program stream in the stream buffer 12, the process returns to step S111 again, and the playback controller 21 waits for the program stream to be transferred to the stream buffer 12. In step S111, when there is a program stream in the stream buffer 12, the playback controller 21 advances the process to step S112, and the demultiplexer 13 separates the program stream into a PAT, a PMT, a video stream, and an audio stream. The separated video stream is transferred to the video decoder buffer 14, the separated audio stream is transferred to the audio decoder buffer 16, and the PAT and PMT are transmitted to the playback controller 21. When there are a plurality of programs in the PAT, or when there are a plurality of video streams and audio streams in the PMT, for example, a stream with a small PID is selected and filled in the stream buffer 12 for convenience. In addition, when there are a plurality of programs in the PAT, or when there are a plurality of video streams and audio streams in the PMT, the playback controller 21 specifically determines the data or stream to be filled in the stream buffer 12 and instructs May be.

  In the next step S113, the playback controller 21 checks the filling amount of the video stream into the video decoder buffer 14 and checks whether the filling amount has reached a predetermined level. If the predetermined level has been reached, the process proceeds to step S115, and if not, the process proceeds to step S114.

  In step S114, the playback controller 21 checks the filling amount of the audio stream to the audio decoder buffer 16 and determines whether or not the filling amount has reached a predetermined level. If the predetermined level has been reached, the process proceeds to step S115; otherwise, the process returns to step S111. The filling amount of the video stream into the video decoder buffer 14 enables playback for a time (predetermined time) or more required from the start of playback by the user from the start of playback from the HDD 11 until separation is started in the demultiplexer 13. There should be data volume. By starting playback using the separated video stream and audio stream, the time required to output the playback video / audio signal is about 0.5 seconds, and high speed playback can be expected. Embodiment 1 In, the specified time is set to 1 second. Therefore, an instruction is given to the stream parser 20 to acquire the PES header display time information (see FIG. 6) of the video stream and the audio stream, and the determination is made based on whether or not the specified time has been reached. In the filling completion determination, instead of the specified time, the amount of data (specified byte amount) sufficient to sufficiently satisfy the time required for reading from the HDD 11 from the reproduction start operation by the user and starting the separation in the demultiplexer 13 ) May be used.

  In step S115, the playback controller 21 performs a stored program information saving process for saving the PAT, PMT, video stream, audio stream, etc. in the head playback, and ends the buffer filling process after completion.

[Holding program information saving process]
FIG. 14 is a flowchart showing the retained program information saving process shown in FIG. First, in step S121, the reproduction controller 21 confirms whether the information to be saved is for reproduction from the beginning of the program or for resume reproduction (that is, confirms the type of information to be saved). If the information to be saved is information for reproduction from the beginning of the program, the process proceeds to step S122A, and if not, the process proceeds to step S122B.

  In step S122A, the playback controller 21 stores the PAT in the first PAT data (FIG. 10) of the nonvolatile semiconductor memory 18, and stores the PAT data length in the first PAT data length (FIG. 10).

  In the next step S123A, the playback controller 21 stores the PMT in the top PMT data (FIG. 10) of the nonvolatile semiconductor memory 18, and stores the PMT data length in the top PMT data length (FIG. 10).

  In step S124A, the playback controller 21 obtains the start address and end address of the video stream that has not been decoded yet in the video decoder buffer 14, and calculates the video stream length. The playback controller 21 stores the head video stream length, and then notifies the decoder buffer controller 19 of the video stream start address, the video stream length, and the head address of the area for storing the head video stream. The decoder buffer controller 19 stores the video stream stored in the video decoder buffer 14 in the head video stream area of the nonvolatile semiconductor memory 18.

  In step S125A, the playback controller 21 obtains the start address and end address of the audio stream that has not been decoded yet in the audio decoder buffer 16, and calculates the audio stream length. The playback controller 21 stores the head audio stream length, and then notifies the decoder buffer controller 19 of the audio stream start address, the audio stream length, and the head address of the area for storing the head audio stream. The decoder buffer controller 19 stores the audio stream stored in the audio decoder buffer 16 in the head audio stream area of the nonvolatile semiconductor memory 18.

  In step S126A, the reproduction controller 21 stores the system clock counter value in the head reference counter value (FIG. 10) of the nonvolatile semiconductor memory 18.

  In step S127A, the playback controller 21 stores a value obtained by adding 1 to the number of TS packets of the program stream separated by the demultiplexer 13 as the head playback read position (FIG. 10).

  In step S122B, the playback controller 21 stores the PAT in the resume PAT data (FIG. 10) of the nonvolatile semiconductor memory 18, and stores the PAT data length in the resume PAT data length (FIG. 10).

  In the next step S123B, the playback controller 21 stores the PMT in the resume PMT data (FIG. 10) of the nonvolatile semiconductor memory 18, and stores the PMT data length in the resume PMT data length (FIG. 10).

  In step S124B, the playback controller 21 obtains the start address and the end address of the video stream in the video decoder buffer 14 and calculates the video stream length. The playback controller 21 stores the resume video stream length, and then notifies the decoder buffer controller 19 of the video stream start address, the video stream length, and the start address of the area where the resume video stream is stored. The decoder buffer controller 19 stores the video stream stored in the video decoder buffer 14 in the resume video stream area of the nonvolatile semiconductor memory 18.

  In step S125B, the playback controller 21 obtains the start address and the end address of the audio stream in the audio decoder buffer 16 and calculates the audio stream length. The playback controller 21 stores the resume audio stream length, and then notifies the decoder buffer controller 19 of the audio stream start address, the audio stream length, and the start address of the area where the resume video stream is stored. The decoder buffer controller 19 stores the audio stream stored in the audio decoder buffer 16 in the resume audio stream area of the nonvolatile semiconductor memory 18.

  In step S126B, the reproduction controller 21 stores the system clock counter value in the resume reference counter value of the nonvolatile semiconductor memory 18.

  In step S127B, the playback controller 21 stores a value obtained by adding 1 to the number of TS packets from the program stream head of the program stream separated by the demultiplexer 13 as a resume playback read position (FIG. 10).

[Reproduction start processing]
Next, an operation when starting reproduction will be described. FIG. 15 is a flowchart showing the reproduction start process by the reproduction controller 21 after receiving the reproduction start operation by the user in the video / audio recording / reproducing apparatus 1 according to the first embodiment. First, in step S131, the playback controller 21 confirms whether the playback start instruction by the user is playback from the beginning of the program or resume playback from the middle of the program. If the playback is from the beginning, the process proceeds to step S132; otherwise, the process proceeds to step S133.

  In step S132, the playback controller 21 performs holding program information load processing for playback from the beginning, and then the processing proceeds to step S134.

  In step S133, the playback controller 21 performs a holding program information load process when performing resume playback, and then the process proceeds to step S134.

  In step S134, the playback controller 21 performs a discontinuity detection process for detecting whether there is a temporal discontinuity in the video stream in the video decoder buffer 14 or the audio stream in the audio decoder buffer 16.

  In step S135, the playback controller 21 instructs the video decoder 15 and the audio decoder 17 to start decoding, and then the process proceeds to step S136.

  In step S136, the playback controller 21 reads a program stream to be played from the HDD 11. At this time, the reading is started from the position of the first reproduction read position recorded in the nonvolatile semiconductor memory 18 (in the case of reproduction from the beginning) or the position skipped only by the resume reproduction read position (in the case of resume reproduction). The read program stream is transferred to the stream buffer 12.

  In step S137, the playback controller 21 instructs the demultiplexer 13 to start the separation of the program stream in the stream buffer 12, and ends the playback start process.

[Holding program information load processing]
FIG. 16 is a flowchart showing the retained program information loading process (S132, S133 in FIG. 15) by the reproduction controller 21. First, in step S <b> 141, the playback controller 21 specifies the stored program information recorded in the nonvolatile semiconductor memory 18 that corresponds to the program ID that is currently being played back.

  In the next step S142, the playback controller 21 confirms whether the playback start instruction by the user is playback from the beginning of the program or resume playback from the middle of the program. In the case of reproduction from the beginning, the process proceeds to step S143. Otherwise, the process proceeds to step S147.

  In step S143, the playback controller 21 reads the head video stream length and head audio stream length from the head playback information of the corresponding stored program information (held program information PI1 in FIG. 10), and the head video of the corresponding stored stream data. The head address of the stream and the head audio stream is specified.

  In step S144, the playback controller 21 passes the head video stream length, head audio stream length, head address of the head video stream, and head address of the head audio stream to the decoder buffer controller 19, and sends the video to the decoder buffer controller 19. Instructs transfer to the decoder buffer 14 and the audio decoder buffer 16. The decoder buffer controller 19 reads out the corresponding video stream and audio stream from the nonvolatile semiconductor memory 18 based on the passed information, transfers them to the video decoder buffer 14 and audio decoder buffer 16, and transfers them to the playback controller 21 after the transfer is completed. Notify completion of transfer.

  In step S145, the playback controller 21 reads the head PAT data length and head PMT data length from the head playback information of the corresponding retained program information (FIG. 10), and reads the head PAT data and head PMT data based on this. , PAT, and PMT are held in the playback controller 21.

  In the next step S146, the reproduction controller 21 reads the head reference counter value and sets it as a system clock counter.

  On the other hand, in step S147, the reproduction controller 21 reads the resume video stream length and the resume audio stream length from the resume reproduction information of the corresponding retained program information (the retained program information PI1 in FIG. 10), and the corresponding retained stream data. The head address of the resume video stream and the resume audio stream is specified.

  In step S148, the playback controller 21 passes the resume video stream length, the resume audio stream length, the start address of the resume video stream, and the start address of the resume audio stream to the decoder buffer controller 19, and sends the video to the decoder buffer controller 19. Instructs transfer to the decoder buffer 14 and the audio decoder buffer 16. The decoder buffer controller 19 reads the corresponding video stream and audio stream from the nonvolatile semiconductor memory 18 based on the passed information, transfers the video stream and audio stream to the video decoder buffer 14 and audio decoder buffer 16, and completes the transfer. Later, the playback controller 21 is notified of the transfer completion.

  In step S149, the reproduction controller 21 reads the resume PAT data length and the resume PMT data length from the resume reproduction information of the corresponding retained program information (held program information PI1 in FIG. 10), and based on this, resume PAT data. The resume PMT data is read out and stored in the playback controller 21 as PAT and PMT.

  In the next step S150, the playback controller 21 reads the resume reference counter value and sets it as a system clock counter.

  In step S151, the playback controller 21 waits for a stream transfer completion notification from the decoder buffer controller 19. Upon receiving the completion notification, the playback controller 21 ends the retained program information loading process.

[Discontinuous detection processing]
FIG. 17 is a flowchart showing the discontinuity detection process (S134 in FIG. 15) by the playback controller 21. First, in step S161, the playback controller 21 instructs the stream parser 20 to display the display time information and the head address of the corresponding PES packet from the video stream in the video decoder buffer 14 and the audio stream in the audio decoder buffer 16. And get.

  In step S162, the reproduction controller 21 waits until all display time information can be acquired. After the acquisition is completed, the reproduction controller 21 performs discontinuous point (temporal discontinuous point) search in step S163. Judgment whether or not it is discontinuous is performed by comparing the display time information before and after in the stream and checking whether the value is larger than a predetermined value. For example, in the case of video, the frame rate is about 24 Hz (about 0.042 seconds between frames) even if it is slow, and this value (about 0.042 seconds between frames) is used as a judgment reference value. If the value is larger than the determination reference value (for example, a value larger than 0.1 second (10 Hz) between frames), it is regarded as discontinuous. Note that the determination reference value only needs to be larger than 0.042 seconds, which is between frames in the case of 24 Hz. For example, the determination reference value may be set to 1 second or larger than 1 second. If the determination reference value is set to a large value, the possibility of erroneous detection in which a non-discontinuous portion is determined to be discontinuous is reduced, but detection omission with respect to a small discontinuity between frames is likely to occur. On the other hand, if the criterion value is set to a small value, the possibility of false detection of determining a non-discontinuous portion as discontinuous increases, but detection omission for a small discontinuity of a value between frames is unlikely to occur. Become.

  In step S164, the playback controller 21 checks whether there is a discontinuity in the video stream.

  If there is a discontinuous point, in step S165, the playback controller 21 checks whether there is an audio stream having a display time approximate to the display time of the discontinuous point of the video stream.

  If there is an audio stream in step S165, in step S166, the playback controller 21 checks whether there is a discontinuity in the audio stream near the discontinuity. Here, a predetermined time range centered on the discontinuous point of the video (for example, within ± 1 second of the discontinuous point) is set as the vicinity of the discontinuous point. As the range near the discontinuity is narrower, false detection decreases, but detection omission increases instead.

  If the determination in step S166 is “Yes”, in step S167, the playback controller 21 sets a discontinuous point of the audio stream in the audio decoder 17 to forcibly continue decoding.

  In the next step S168, the playback controller 21 sets a discontinuous point of the video stream in the video decoder 15 to forcibly continue decoding.

  When the determination in step S165 is “No”, the playback controller 21 compares the display time difference between before and after with D_V_MAX set in advance, and determines that the display time difference is greater than D_V_MAX. The process proceeds to S168. If the display time difference is less than or equal to D_V_MAX, the process returns to step S163. Since D_V_MAX is a discontinuity determination for only the video stream, it is desirable that D_V_MAX be set to a larger value (for example, 60 seconds) than when discontinuity is determined using video and audio.

  In step S164, the playback controller 21 ends the discontinuity detection process when the next discontinuous point disappears in the video stream. As described above, the determination of the discontinuity point is preferably performed for both the video stream and the audio stream, but may be performed by detecting one temporal discontinuity point of the video stream or the audio stream. Good.

[Switching from separated stream to unseparated stream]
Next, the connection of the video stream and audio stream that have been separated by the demultiplexer 13 and held in the nonvolatile semiconductor memory 18 in advance at the start of reproduction and the program stream before separation (unseparated) read from the HDD 11 will be described. FIG. 18 is a diagram illustrating the relationship between the video stream, the audio stream, and the program stream at the start of playback. In FIG. 18, TS packets shown as separated (TS in the separated range in FIG. 18) are separated in advance by the demultiplexer 13, and the separated video stream and audio stream are non-volatile. It is held in the semiconductor memory 18. At the start of reproduction, these video streams and audio streams are first read from the nonvolatile semiconductor memory 18 and transferred to the video decoder buffer 14 and the audio decoder buffer 16.

  On the other hand, an unseparated TS packet that has not yet been separated (TS in the unseparated range in FIG. 18) is read from the HDD 11 at the start of reproduction. Since the TS packet that is not separated is held at the head playback read position (in the case of head playback) or the resume playback read position (in the case of resume playback) of the nonvolatile semiconductor memory 18, For playback, the head playback read position is referred to, and TS packets after this position are read from the HDD 11, transferred to the stream buffer 12, and separated by the demultiplexer 13, so that the video decoder buffer 14 and audio decoder from the nonvolatile semiconductor memory 18 The video stream and audio stream transferred to the buffer 16 can be connected without failure.

[Playback stop processing]
Next, the operation when stopping reproduction will be described. FIG. 19 is a flowchart showing playback stop processing by the playback controller 21 after receiving a playback stop instruction from the user in the video / audio recording and playback apparatus 1 according to the first embodiment. First, in step S171, the playback controller 21 stops the decoding of the video decoder 15 and the audio decoder 17.

  In step S172, the playback controller 21 analyzes the video stream and the audio stream in the video decoder buffer 14 and the audio decoder buffer 16, and determines the start point of the video stream and the audio stream to be held in the nonvolatile semiconductor memory 18. .

  In the next step S173, the playback controller 21 checks whether the data amount of the video stream to be stored is sufficient and whether the data amount of the audio stream is sufficient in step S174. The determination criteria are based on steps S113 and S114 in FIG. If both are insufficient, the playback controller 21 continues the separation by the demultiplexer 13 and stores it in the video decoder buffer 14 and the audio decoder buffer 16.

  In step S173 or step S174, if the reproduction controller 21 determines that a sufficient stream has been accumulated, the process proceeds to step S175.

  In step S175, the playback controller 21 stops program reading in the HDD 11 and separation by the demultiplexer 13. Thereafter, the playback controller 21 performs retained program information data processing and ends the playback stop processing.

[Stream analysis processing]
FIG. 20 is a flowchart showing stream analysis processing by the playback controller 21. In step S181, the playback controller 21 issues an instruction to the stream parser 20, and issues a request for obtaining the start address and display time information of the most recently decoded video access unit in the decoded video access unit. The stream parser 20 searches for the latest video access unit that has been decoded by the video stream in the video decoder buffer 14 and notifies the playback controller 21 of the head address and display time information of the video access unit.

  In the next step S182, the playback controller 21 instructs the stream parser 20 to notify the start address of the audio access unit having the display time closest to the specified display time in the decoded audio stream.

  In the next step S183, the playback controller 21 sets the head address of the video access unit acquired in step S181 as the head of the video stream.

  In the next step S184, the start address of the audio access unit acquired in step S182 is set as the start of the audio stream, and the stream analysis process is terminated.

  The reason why the head of the undecoded video stream in the video decoder buffer 14 and the head of the audio stream in the undecoded audio decoder buffer 16 are not used as they are is that video and audio must be decoded in units of access units. For this reason, even if data other than the head of the access unit is input to the decoder, it cannot be decoded, and is reproduced from a position slightly ahead (temporally subsequent position) from the point at which it was interrupted last time.

  Also, by decoding the stream other than the head of the access unit, a time that cannot be reproduced by the decoder occurs, and the output of the reproduced video and audio is delayed. By identifying the head of the most recently decoded video access unit and the audio access unit that is close to the display time, and setting them to be decoded first during the next resume playback, the position where the previous stop occurred during the resume playback. It is possible to prevent playback from a position earlier than that, and to speed up the output of playback video and audio.

<< 1-3 >> Effects of First Embodiment As described above, according to the video / audio recording / reproducing apparatus and the video / audio recording / reproducing method according to the first embodiment, the reproduction controller 21 is held in the HDD 11. When a user instruction for starting playback of a program stream is received from the operation unit 22, the video stream and the audio stream supplied to the video decoder 15 and the audio decoder 17 are initially held in the nonvolatile semiconductor memory 18. The video stream and the audio stream (separated stream) are set, and then the video stream and the audio stream that are temporally continuous with the video stream and the audio stream held in the nonvolatile semiconductor memory and held in the HDD 11 Switch to video and audio streams based on the current program stream Replace. As described above, according to the video / audio recording / reproducing apparatus and video / audio recording / reproducing method according to the first embodiment, the head part of the program stream and the part to be reproduced first in the resume reproduction are preliminarily shown as information indicating the program structure, video The time (delay time or waiting time) required for the playback video / audio signal to be output from the playback start operation by the user is shortened by separating and storing the stream and the audio stream, and reading and playing them during playback. Therefore, a comfortable operation response can be provided to the user.

  In addition, according to the video / audio recording / reproducing apparatus and the video / audio recording / reproducing method according to the first embodiment, the program stream is detected as a video stream or audio by detecting a temporal discontinuity of the video stream or audio stream at the start of reproduction. The program structure is changed by controlling the video decoder 15 and the audio decoder 17 so that the reproduction can be continued even if there is a temporal discontinuity point by supplementing information on the composition change that is lost by separating and storing the stream. Even if a time discontinuity occurs in such a case, the reproduction can be continued.

<< 2 >> Embodiment 2
<< 2-1 >> Configuration of Second Embodiment The video / audio recording / reproducing apparatus according to the second embodiment is a part of the retained program information PI2 recorded in the nonvolatile semiconductor memory 18 and one of the processes performed by the reproduction controller 21. 1 is different from the video / audio recording / reproducing apparatus 1 according to the first embodiment shown in FIG. In other respects, the video / audio recording / reproducing apparatus according to the second embodiment is the same as the video / audio recording / reproducing apparatus 1 according to the first embodiment. Therefore, FIG. 1 is also referred to when describing the second embodiment. Further, the following description of the second embodiment will be focused on differences from the first embodiment.

  FIG. 21 is a diagram showing a configuration of retained program information PI2 recorded in the nonvolatile semiconductor memory 18. As shown in FIG. The retained program information PI2 in the second embodiment is such that each of the head reproduction information and the resume reproduction information has an area for recording the number of video discontinuities, the position of video discontinuities, the number of audio discontinuities, and the position of audio discontinuities. This is different from the retained program information in the second embodiment. The video discontinuity number indicates the number of discontinuous points in the video stream in the holding stream data area. As many areas as the number of video discontinuities are prepared in the area for recording the video discontinuity positions, and numbers indicating how far the discontinuity points are from the beginning of the video stream (for example, bytes) Number) is recorded. The audio discontinuity number indicates how many points are discontinuous in the audio stream in the retained stream data area. As many areas as the number of audio discontinuities are prepared in the area to record the audio discontinuity position, and a number indicating how far the discontinuity point is from the beginning of the audio stream (for example, byte) Number) is recorded.

<< 2-2 >> Operation of the second embodiment [program recording process]
FIG. 22 is a flowchart showing buffer filling processing performed by the playback controller 21 when a program is recorded on the HDD 11 in the video / audio recording and playback device according to the second embodiment. 22, steps that are the same as or correspond to the steps in FIG. 12 are given the same step numbers. The buffer filling process in the second embodiment is different from the buffer filling process in the first embodiment in that the discontinuity detecting process is performed in step S201 after the retained program saving process in step S115. In the first embodiment, discontinuity detection is performed not at the time of recording but at the start of reproduction. In the second embodiment, discontinuity detection is performed at the time of recording.

[Discontinuous detection processing]
FIG. 23 is a flowchart showing discontinuity detection processing performed by the playback controller 21. The difference from the discontinuity detection processing in the first embodiment is that when a discontinuous point is detected, a discontinuous position is recorded. Specifically, if “Yes” in step S166, the discontinuity point is recorded in the audio discontinuity position of the retained program information PI2 in step S211, and the discontinuity point is recorded in step S212 as the video discontinuity position of the retained program information PI2. To record. At the end of the discontinuity detection process (step S213), the number of video discontinuities and the number of audio discontinuities are recorded in the number of video discontinuities and the number of audio discontinuities in the retained program information PI2.

[Playback stop processing]
FIG. 24 is a flowchart showing a program stop process performed by the playback controller 21 when stopping playback in the video / audio recording / playback apparatus according to the second embodiment. In FIG. 24, steps that are the same as or correspond to the steps in FIG. In the buffer filling process in the second embodiment, the discontinuous point detection process in the first embodiment is performed after the retained program information saving process for resume reproduction in the step S176 and then the discontinuity detecting process in the step S221. And different.

[Reproduction start processing]
FIG. 25 is a flowchart showing the reproduction start process performed by the reproduction controller 21 at the start of reproduction. In FIG. 25, steps that are the same as or correspond to the steps in FIG. The reproduction start process in the second embodiment is different from the discontinuity detection process (step S134) in that the discontinuous point reading (steps S231 and S232) and the discontinuous point registration (step S233) are performed. 1 is different from the reproduction start process in FIG. Specifically, in step S132, the playback controller 21 loads the head holding program information. After that, in step S231, the playback controller 21 reads the video discontinuity number, video discontinuity position, and audio discontinuity of the head playback information. Read out the number and position of the voice discontinuity. In step S133, after the resume holding program information is loaded, the video discontinuity number, the video discontinuity position, the audio discontinuity number, and the audio discontinuity position of the resume reproduction information are read in step S232. Thereafter, the discontinuous points read out in step S233 are registered in the video decoder 15 and the audio decoder 17.

  As described above, the head portion of the program stream and the portion to be played back first in the resume playback are separated into the information indicating the program structure, the video stream and the audio stream and stored in advance, and further the discontinuity information is stored. By reading and playing during playback, it is possible to eliminate the time delay and processing load for analyzing the video stream and audio stream before decoding starts during playback, so that a playback video / audio signal is output from the playback start operation by the user. It is possible to further reduce the delay time required until the operation is completed, and to provide a comfortable operation response to the user.

  In the second embodiment, the detection of the discontinuity is detected by searching the video stream and the audio stream in the video decoder buffer 14 and the audio decoder buffer 16, but the playback controller 21 uses the PAT and the audio stream. When a change is detected in the program structure in the PMT, the latest data addresses of the video decoder buffer 14 and the audio decoder buffer 16 at that time are referred to, and the discontinuity position and the number of discontinuities are obtained based on the information. May be. The reason why such a discontinuity point (program discontinuity point) can be used is that the program structure changes because the display time information may be discontinuous.

[Buffer filling process]
FIG. 26 is a flowchart showing buffer filling processing in the video / audio recording / reproducing apparatus according to Embodiment 2. In FIG. 26, steps that are the same as or correspond to the steps in FIG. In the buffer filling process in the second embodiment, after the demultiplexing (step S112), the program configuration change confirmation process is performed in step S241 and the retained program information saving process (step S115), and then the discontinuous point recording process. Is different from the playback start process in the first embodiment.

[Program composition change confirmation processing]
FIG. 27 is a flowchart showing a program structure change confirmation process in the video / audio recording / reproducing apparatus according to the second embodiment. First, in step S251, the playback controller 21 checks whether there is a program configuration change notification from the demultiplexer 13.

  If there is a change notification, in step S252, the playback controller 21 registers a change point at which the program configuration received together with the notification changes in the video decoder and the audio decoder.

  In the next step S253, the playback controller 21 adds to the discontinuity candidate list.

  If there is a change point decoding notification in step S254, the playback controller 21 deletes the discontinuity point candidate list and ends the process. By doing this, it is possible to remove from the list those that have been decoded but have been decoded.

  As described above, when the demultiplexer 13 detects the change in the configuration of the program stream when the demultiplexer 13 separates the video stream and the audio stream from the program stream output from the HDD 11, It is registered in the video decoder and the audio decoder, and at the time of reproduction, the registered change point is regarded as a temporal discontinuity point. When a change in the program structure is detected in the process of separating the program stream, the change point is retained and used as a discontinuous point of the video stream and the audio stream during playback, thereby analyzing the video stream and the audio stream Thus, the processing load at the time of recording or playback can be reduced.

[Discontinuous point recording process]
FIG. 28 is a flowchart showing discontinuous point recording processing in the video / audio recording / reproducing apparatus according to Embodiment 2. In step S261, the playback controller 21 calculates the number of discontinuities and the discontinuity position from the discontinuity point candidate list. Next, in step S262, the playback controller 21 records the number of video discontinuities, the number of audio discontinuities, the video discontinuity position, and the audio discontinuity position of the retained program information PI2, and ends the process.

[Change point confirmation processing during playback]
FIG. 29 is a flowchart showing a change point confirmation process during the reproduction process in the video / audio recording / reproducing apparatus according to the second embodiment. First, in step S271, the playback controller 21 checks whether there is a playback stop instruction. If “No”, in step S272, the playback controller 21 performs a program configuration change confirmation process. If “YES” in the step S271, the reproduction controller 21 performs a discontinuous point recording process in a step S273.

<< 2-3 >> Effects of Second Embodiment As described above, according to the video / audio recording / reproducing apparatus and the video / audio recording / reproducing method according to the second embodiment, in the process of separating the program streams, When this change is detected, the change point is retained and used as a discontinuous point of the video stream and audio stream during playback, eliminating the need to analyze the video stream and audio stream. The processing load can be reduced, and operability comfortable for the user can be provided.

  DESCRIPTION OF SYMBOLS 1 Video / audio recording / reproducing apparatus, 11 HDD (1st holding | maintenance part), 12 Stream buffer, 13 Demultiplexer (Program stream separation part), 14 Video decoder buffer (Video stream temporary holding part), 15 Video decoder (Video signal decoding) Part), 16 audio decoder buffer (audio stream temporary holding part), 17 audio decoder (audio signal decoding part), 18 nonvolatile semiconductor memory (second holding part), 19 decoder buffer controller, 20 stream parser, 21 playback controller (Reproduction control unit), 22 operation unit.

Claims (8)

A first holding unit for holding a program stream and outputting the held program stream;
A program stream separating unit for separating a video stream and an audio stream from the program stream output from the first holding unit;
A second holding unit which has a higher access speed than the first holding unit and holds a portion corresponding to a specific portion of the program stream, which is a video stream and an audio stream separated by the program stream separating unit;
A video signal decoding unit for decoding the video stream and converting it into a video signal;
An audio signal decoding unit that decodes the audio stream and converts it into an audio signal;
An operation unit for receiving user instructions;
A reproduction control unit that controls the first holding unit, the program stream separation unit, and the second holding unit;
The reproduction control unit
A video stream and an audio stream supplied to the video signal decoding unit and the audio signal decoding unit when a user instruction to start playback of the program stream held in the first holding unit is received from the operation unit The
First, set the video stream and the audio stream held in the second holding unit,
Next, the video stream and the audio stream that are temporally continuous with the video stream and the audio stream held in the second holding unit, and the video based on the program stream held in the first holding unit A video signal recording / reproducing apparatus characterized by switching between a stream and an audio stream. The reproduction control unit detects the presence or absence of at least one temporal discontinuity in the video stream and the audio stream, and determines that the temporal discontinuity exists, the video signal decoding unit The video / audio recording / reproducing apparatus according to claim 1, wherein the audio signal decoding unit is controlled to continue reproduction. The reproduction control unit
When the program stream separation unit detects a change in the configuration of the program stream when separating the video stream and the audio stream from the program stream output from the first holding unit, the change point is determined as the change point. Held in the signal decoding unit and the audio signal decoding unit,
The video / audio recording / reproducing apparatus according to claim 2, wherein the temporal discontinuity point is regarded as the change point at the time of reproduction. A video stream temporary holding unit that temporarily holds the video stream separated by the program stream separation unit and supplies the video stream to the video signal decoding unit;
The audio stream temporary holding unit that temporarily holds the audio stream separated by the program stream separation unit and supplies the audio stream to the audio signal decoding unit, further comprising: 2. The video / audio recording / reproducing apparatus according to item 1. The first holding unit is a hard disk drive;
The video / audio recording / reproducing apparatus according to any one of claims 1 to 4, wherein the second holding unit is a nonvolatile semiconductor memory. A video signal recording / reproducing method executed by a video signal recording / reproducing apparatus,
Holding a program stream in a first holding unit and outputting the held program stream;
Separating a video stream and an audio stream from the program stream output from the first holding unit;
A step of holding, in a second holding unit having a higher access speed than the first holding unit, a video stream and an audio stream separated by the program stream separating unit and corresponding to a specific part of the program stream When,
Decoding the video stream and converting it into a video signal, and decoding the audio stream and converting it into an audio signal;
Have
When the video signal recording / playback apparatus receives a user instruction to start playback of the program stream held in the first holding unit, the video stream to be decoded and converted into a video signal and the decoding The audio stream to be converted into the audio signal is set to the video stream and the audio stream held in the second holding unit,
Thereafter, the video stream decoded and converted into a video signal and the audio stream decoded and converted into an audio signal are temporally continuous with the video stream and audio stream held in the second holding unit. A video signal recording / reproducing method, wherein the video stream and the audio stream are switched to a video stream and an audio stream based on the program stream held in the first holding unit. Detecting the presence or absence of a temporal discontinuity in at least one of the video stream and the audio stream;
When it is determined that the temporal discontinuity is present, the video stream is decoded and converted into a video signal, and the playback in the step of decoding the audio stream and converting it into an audio signal is controlled. The video / audio recording / reproducing apparatus according to claim 1, further comprising: a step. Detecting a change in the configuration of the program stream when the video stream and the audio stream are separated from the program stream output from the first holding unit;
8. The video / audio recording / reproducing method according to claim 7, wherein when a change in the configuration of the program stream is detected, the change point is considered to be the temporal discontinuity point.

Images