JP2005210636A - Digital data playback method, and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable playback of a video image continuously when switching from a special playback to an ordinary playback, and use of an audio buffer for other purposes during the special playback. <P>SOLUTION: A composite digital data 2 including video and audio data being read out from an HDD 1 is separated into a video data and an audio data in a TS Demux 3. A read pointer value 14 indicating the position of a readout digital data 2 on the medium is preserved in a read pointer (RP) preservation area 15. On the completion of the special playback, time information (T0) in a present halt state is acquired from a video buffer 6 by means of a time information and HDD read pointer control circuit 13. Then, seeking in the HDD 1 is performed up to a position in the vicinity corresponding to T0, from which extraction of the digital data 2 is started. Operation in which the separated audio data 5a being separated in the TS Demux 3 is continued to store into an audio buffer 7 is repeated until the RP in the HDD 1 becomes the same pointer as the RP 14 acquired from the RP preservation area 15. At the time point reaching the RP 14, the ordinary playback is performed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a device for playing back digital video content, and more particularly to a digital data playback device having special playback functions such as fast forward and rewind.

  In recent years, special reproduction such as fast-forward, pause, and reverse reproduction is desired in a system that reproduces digital video and audio composite data such as an HDD recorder and a DVD player. For example, Patent Document 1 discloses a medium in which digital data is stored, a separation circuit that takes digital data from the medium and separates it into video data and audio data, a video buffer that accumulates each data from the separation circuit, and An audio buffer, a video decoder and an audio decoder for decoding data in each buffer, and an STC (System Time Clock) counter for controlling the timing at which each decoder fetches data from each buffer and the timing at which the medium transmits data The special reproduction technique in the moving image reproduction processing apparatus having the above is described.

  In digital systems such as MPEG, video and audio data are digitized and combined independently, and therefore, in AV synchronization processing for adjusting the playback timing to each other when returning from normal playback to normal playback. There is a problem that it takes time and it is difficult to realize smooth reproduction like an analog VTR. In Patent Document 1, in order to solve this problem, the STC counter is configured by a variable counter, and the clock itself which is a reference for the operation timing is changed by the variable counter, and the video decoder and the audio decoder are set to be in normal playback. Special playback is performed while operating in the same way.

  However, when fast-forwarding or rewinding control of AV data is performed, usually fast-forwarding or rewinding operation is performed while watching a video image, and there is not much need for fast-forwarding or rewinding reproduction of audio data at the same time. Therefore, it is not practical to provide AV synchronization processing means for matching the reproduction timings as in Patent Document 1, and an extra cost is required.

  For this reason, a method for reproducing only video data and not reproducing audio data during special reproduction has been proposed. FIG. 5 is a block diagram showing such a conventional HDD playback process. In this prior art, data transfer to the audio buffer is not performed during special playback, and when returning from normal playback to normal playback, the video buffer and the audio buffer are temporarily emptied and stored again, thereby performing AV synchronization processing. So that it does n’t take long.

  In FIG. 5, an HDD 1 is a recorder including a hard disk (a medium storing digital data) such as a magnetic disk and a DVD in which composite video and audio data of a digital system are stored, and a video read from the HDD 1. The digital data 2 combined with audio is input to a TS (Transport Stream) Demux (Demultiplexer) 3 and separated into video data and audio data within the TS Demux 3.

  During normal playback, the video / audio buffer control circuit 10 controls transfer of the video data 4a and the audio data 5a separated by the TS Demux 3 to the video buffer 6 and the audio buffer 7, respectively. The video decoder 8 takes out the video data 4b stored in the video buffer from the video buffer 6 as necessary, decodes it, and outputs it to the video playback device. The audio decoder 9 takes out the audio data 5b stored in the audio buffer from the audio buffer 7 as necessary, decodes it, and outputs it to the audio playback device.

  On the other hand, during special playback, the video data 4a output from the TS Demux 3 is transferred to the video buffer 6 by the control signal from the video / audio buffer control circuit 10, and the video decoder 8 stores the video data stored in the video buffer. 4b is taken out from the video buffer 6 as necessary, decoded and output to the video playback device. However, the audio data 5a output from the TS Demux 3 is not transferred to the audio buffer 7, and the audio decoder 9 is in an operation stopped state. Become. Accordingly, the audio data 5a transferred from the TS Demux 3 immediately before the start of special reproduction is stored in the audio buffer 7 as it is.

  When the special reproduction is finished and the normal reproduction is switched, the video buffer 6 and the audio buffer 7 are once emptied by the video / audio buffer clear control circuit 11 and then the video sent from the TS Demux 3 is sent. Control is made so that the data 4 a is stored in the video buffer 6 and the audio data 5 a sent from the TS Demux 3 is stored in the audio buffer 7. The video decoder 8 and the audio decoder 9 are stored in the video buffer 6 and the audio buffer 7. Normal reproduction is started by taking out the data 4b and the audio data 5b from each buffer as necessary and decoding them.

  FIG. 6 is a flowchart of the above-described conventional HDD playback process. In step S1, data for one cluster is acquired from the HDD 1, and in step S2, the video data and audio data are separated in the TS Demux 3. In step S3, the playback state is determined. In the case of normal playback or special playback, it is determined in step S4 whether or not the video buffer 6 has a free space. If there is no free space in the buffer, the buffer is freed. Step S4 is repeated. If there is an empty buffer, 6 data is transferred to the video buffer in step S5.

  Further, in step S6, it is determined whether or not normal reproduction is performed. In the case of normal reproduction, it is determined whether or not there is an empty audio buffer in step S7. If there is no empty buffer, step is performed until the buffer is empty. Repeat S7. If there is an empty buffer, data is transferred to the audio buffer in step S8, and the process returns to step S1.

  On the other hand, if it is determined in step S6 that special reproduction is to be performed, data transfer to the audio buffer 7 is not performed, and the process returns to step S1. That is, in this case, the audio data is controlled not to be transferred to the audio buffer 7 by the video / audio buffer control circuit 10. If it is determined in step S3 that special playback has ended, the video / audio buffer clear control circuit 11 empties the video buffer 6 and audio buffer 7 in step S9 and returns to step S1.

  In the prior art shown in FIGS. 5 to 6, since all video data stored in the buffer at the end of special playback is deleted (cleared), when normal playback is started from fast-forward playback, the special playback end point is reached. In this case, the video jumps forward by the amount of data stored in the video buffer 7, and when normal playback starts from fast reverse playback, the video data stored in the video buffer 7 at the end of special playback is displayed. Has the problem of returning backwards.

  In order to solve such problems, audio data synchronized with video data during special playback is stored in the audio buffer, and when returning to normal playback, the video data stored in the video buffer and audio buffer is stored. A method for solving the problem of video skipping by transferring audio data to the respective decoders has been conventionally considered.

  FIG. 7 is a block diagram of another conventional HDD playback process showing such an example. In FIG. 7, the video and audio data 2 extracted from the HDD 1 is separated into video data and audio data in the TS Demux 3.

  During normal playback, the video / audio buffer control circuit 10 controls transfer of the video data 4a and the audio data 5a separated by the TS Demux 3 to the video buffer 6 and the audio buffer 7, respectively. The video decoder 8 takes out the video data 4b stored in the video buffer from the video buffer 6 as necessary, decodes it, and outputs it to the video playback device. The audio decoder 9 takes out the audio data 5b stored in the audio buffer from the audio buffer 7 as necessary, and outputs it to the audio playback device.

  During the special reproduction, the video data 4a sent from the TS Demux 3 is transferred to the video buffer 6 by the control signal from the video / audio buffer control circuit 10, and the video decoder 8 receives the video data 4b stored in the video buffer. If necessary, it is taken out from the video buffer 6, decoded, and output to the video playback device. However, the audio data 5a sent from the TS Demux 3 is transferred to and stored in the audio buffer 7, but the audio data stored in the audio buffer 7 is not transferred to the audio decoder 9. During special reproduction, the audio buffer clear control circuit 12 deletes (clears) the stored audio data from the audio buffer 7 when the audio buffer 7 is full.

  FIG. 8 is a flowchart showing the other conventional HDD playback processing. In step S1, data for one cluster is acquired from the HDD 1, and the data acquired in TS Demux 3 in step S2 is converted into video data and audio data. To separate. In step S4, it is determined whether or not there is a space in the video buffer 6. If there is no space in the video buffer 6, step S4 is repeated until there is space in the buffer. If the video buffer 6 is empty, 6 data is transferred to the video buffer in step S5.

  In step S7, it is determined whether or not the audio buffer 7 is empty. If the audio buffer 7 is not empty, it is determined whether or not special reproduction is performed in step S10. Step S7 is repeated until there is a free space. If there is an empty space in the audio buffer 7, data is transferred to the audio buffer 7 in step S8, and the process returns to step S1. In the case of special reproduction in the determination in step S10, the data stored in the audio buffer 7 in step S11 is deleted by the audio buffer data clear control circuit 12, and step S7 is repeated.

JP-A-8-331511

  As described above, in the above prior art, when the special playback is finished, the video buffer and the audio buffer are temporarily emptied and then the video data and the audio data are newly stored. There is a problem in that normal playback from the position where the special playback is stopped is not performed, and video is skipped when the special playback is switched to the normal playback. In digital broadcasting and the like, the impact that the screen does not continue due to a change in playback speed or the like is great, which is a factor that causes stress for the viewer.

  In the case of the above-mentioned other prior arts, the video buffer and audio buffer data are not cleared at the end of special playback, so the video when returning from normal playback to normal playback can be played continuously. Since audio data is continuously stored in the audio buffer during reproduction, an audio buffer that is unnecessary during special reproduction is always occupied by the audio data. For this reason, there is a problem that resources cannot be effectively used by using the audio buffer for other purposes during special playback.

  For example, in a system that displays TV video and playback video from the HDD at the same time, when the HDD is playing normally, the HDD audio is played, and when the HDD is specially played, the TV audio is played. Since an additional audio buffer for TV must be prepared, this becomes a factor affecting the cost of the entire system.

  In view of the above problems, an object of the present invention is to enable continuous video playback when switching from special playback to normal playback, and to enable an audio buffer for storing audio data to be used for other purposes during special playback. To effectively use resources.

  The digital data reproducing method of the present invention captures the digital data from a medium storing digital data, separates the captured digital data into video data and audio data, and separates the separated video data and audio data into a video buffer. Is stored in the audio buffer, and the stored data is taken into the video decoder and the audio decoder according to the playback state and decoded to perform normal playback or special playback, when switching from special playback to normal playback. The amount of data stored in the video buffer from the time information position during the stop of the video data remaining in the video buffer at the end of special playback or from the read pointer position of the video data of the medium at the end of special playback The media The normal playback is started after the audio data from the seek position to the read pointer position of the video data of the medium at the special playback end time is stored in the audio buffer, so that the video at the normal playback start time is started. And synchronize the sound.

  The digital data reproducing apparatus of the present invention includes a medium in which the digital data is stored, a separating unit that captures the digital data from the medium and separates the data into video data and audio data, and each data separated by the separating unit. A video buffer and an audio buffer to be stored, and a video decoder and an audio decoder for taking in and decoding the data of each buffer, and having a normal reproduction function and a special reproduction function, and reading out video data of the medium Means for detecting and storing the pointer position, means for acquiring time information during the stop of the video data left in the video buffer at the time of the end of special playback, and when switching from special playback to normal playback, Seek the position corresponding to the acquired time information, and Means for reading audio data from the seek position to the pointer position stored at the end of the special playback from the medium and storing it in the audio buffer; and audio data from the seek position to the read pointer position And means for starting normal reproduction upon detection of being stored in the audio buffer.

  A different aspect of the digital data reproducing apparatus of the present invention includes a medium in which digital data is stored, a separation unit that takes in the digital data from the medium and separates it into video data and audio data, and each separated by the separation unit. A video buffer and an audio buffer for storing the data, and a video decoder and an audio decoder for fetching and decoding the data of each buffer, and having a normal playback function and a special playback function, the video of the medium Means for detecting and storing the read pointer position of the data, means for calculating the amount of data stored in the video buffer at the end of special playback, and stored at the end of special playback when switching from special playback to normal playback Corresponds to the amount of data calculated from the pointer position Means for reading the medium from the seek position to the pointer position stored at the end of the special playback and storing the data in the audio buffer; and reading pointer from the seek position. Means for detecting that audio data up to a position has been stored in the audio buffer and starting normal reproduction.

  The present invention also includes a step of capturing the digital data from a medium in which the digital data is stored, a step of separating the captured digital data into video data and audio data, and a video buffer for each of the separated video data and audio data. As a program for causing a computer to execute normal reproduction or special reproduction by storing the accumulated data in a video decoder and an audio decoder according to a reproduction state and decoding the accumulated data. It is possible to adopt a configuration in which reproduction control is executed by a built-in computer (CPU).

  In the present invention, when switching from special playback to normal playback, the video buffer is not cleared, and audio data corresponding to the video data remaining in the video buffer at the end of special playback is read from the medium without clearing the video buffer. Accumulation and then normal playback starts, so when switching from special playback to normal playback, the video can be played continuously without being discontinuous, and an audio buffer is used during special playback Since there is no need, the audio buffer can be effectively used for other buffers during special playback.

  FIG. 1 is a block diagram of an HDD reproduction processing apparatus showing a first embodiment of the present invention.

  The HDD 1 is a recorder provided with a hard disk (medium storing digital data) such as a magnetic disk and DVD in which composite data of digital video and audio is stored, and a composite of video and audio read from the HDD 1. The converted digital data 2 is input to a TS (Transport Stream) Demux (Demultiplexer) 3 and separated into video data and audio data in the TS Demux 3. Further, a read pointer value 14 indicating the position of the digital data 2 read from the HDD 1 on the medium is stored in a Read pointer (hereinafter referred to as RP) storage area 15.

  During normal reproduction, the video / audio buffer control circuit 10 transfers the video data 4a and audio data 5a separated by the TS Demux 3 to the video buffer 6 and the audio buffer 7, respectively. The video decoder 8 takes out the video data 4b stored in the video buffer from the video buffer 6 as necessary, decodes it, and outputs it to the video playback device. The audio decoder 9 takes out the audio data 5b stored in the audio buffer from the audio buffer 7 as necessary, decodes it, and outputs it to the audio playback device.

  During special playback, the video / audio buffer control circuit 10 transfers the video data 4a sent from the TS Demux 3 to the video buffer 6, and the video decoder 8 uses the video data 4b stored in the video buffer as necessary. The data is taken out from the video buffer 6 and decoded, and output to the video reproduction apparatus. On the other hand, the audio data is controlled by the video / audio buffer control circuit 10 so that the audio data 5 a sent from the TS Demux 3 is not transferred to the audio buffer 7.

  In the case of the end of special reproduction, the time information / HDD read pointer control circuit 13 acquires time information (hereinafter referred to as T0) that is currently stopped from the video buffer 6, and seeks HDD1 to the vicinity corresponding to T0. The HDD 1 starts to extract the combined video and audio data 2 from the seek position, and separates the extracted composite data 2 into video data and audio data within the TS Demux 3.

  The time information / HDD read pointer control circuit 13 stores the audio data 5a separated by TS Demux 3 and sent from TS Demux 3 in the audio buffer 7, and the RP of HDD 1 acquired from the RP storage area 15 and the RP 14 Control is repeated until the same pointer is reached. At this time, the video data 4 a sent from the TS Demux 3 is discarded and is not stored in the video buffer 6.

  When the RP 14 of the HDD 1 reaches the RP 14 acquired by the time information / HDD read pointer control circuit 13, the normal reproduction state is started. Thereafter, the video data 4 a and the audio data 5 a separated by the TS Demux 3 are stored in the video buffer 6. And transferred to the audio buffer 7 respectively. The video decoder 8 takes out the video data 4b stored in the video buffer from the video buffer 6 as necessary, decodes it, and outputs it to the video playback device. The audio decoder 9 takes out the audio data 5b stored in the audio buffer from the audio buffer 7 as necessary, and outputs it to the audio playback device.

  FIG. 2 is a flowchart showing the operation of HDD playback processing in the first embodiment. Hereinafter, the processing in the case of performing normal playback → special playback → normal playback will be described with reference to the flowchart of FIG.

  In the case of normal playback, the RP from the HDD 1 is stored in step S12, the data for one cluster at the RP position stored from the HDD 1 is acquired in step S1, and the read data is converted into video data and audio in step S2. Separate into data. Next, in step S4, it is determined whether or not the video buffer 6 is empty. If there is no empty buffer, step S4 is repeated until the buffer is empty. If there is an empty buffer, data is transferred to the video buffer 6 in step S5.

  In step S3, the playback state is determined. In this case, since normal playback is performed, it is determined in step S7 whether or not the audio buffer 7 has an empty space. Repeat S7. If there is a free space in the buffer, data is transferred to the audio buffer 7 in step S8, and it is determined whether or not normal reproduction is performed in step S6. In this case, since normal reproduction is performed, the process returns to step S12. The above procedure is repeated during normal playback.

  In the case of special reproduction, the RP from the HDD 1 is stored in step S12, the data for one cluster at the RP position stored from the HDD 1 is acquired in step S1, and the read data is converted into video data and audio in step S2. Separate into data. Next, in step S4, it is determined whether or not the video buffer 6 is empty. If there is no empty buffer, step S4 is repeated until the buffer is empty. If there is an empty buffer, data is transferred to the video buffer 6 in step S5. In step S3, the playback state is determined. In this case, since the playback is special playback, the video / audio buffer control circuit 10 does not transfer the audio data to the audio buffer 7 and returns to step S12.

  In the case of the end of the special playback, the RP from the HDD 1 is saved in step S12, the data for one cluster at the PR position saved from the HDD 1 is acquired in step S1, and the video data and audio are transmitted in TS Demux 3 in step S2. Separate into data. Next, in step S4, it is determined whether or not the video buffer 6 is empty. If there is no empty buffer, step S4 is repeated until the buffer is empty. If there is an empty buffer, data is transferred to the video buffer 6 in step S5.

  In step S3, the playback state is determined. In this case, since the special playback is completed, T0 is obtained from the video buffer in step S13, the HDD1 is sought to near T0 in step S14, and the audio buffer 7 is cleared in step S15. In step S16, the RP stored in step S12 is acquired, and the audio data is transferred to the audio buffer 7 in step S8.

  Then, in step S6, it is determined whether or not normal reproduction is performed. In this case, since special reproduction is completed, it is determined in step S17 whether or not audio data has been transferred to the RP position acquired in step S16, and the RP position has been reached. If not, audio data for one cluster is acquired from the HDD 1 in step S19, and the process returns to step S8. This loop is repeated until the saved RP position is reached. If it is determined in step S17 that the audio data has been transferred to the RP position, the playback state is set to normal playback in step S18, and the process returns to step S12. Thereafter, the normal reproduction process is performed.

  According to the present embodiment, the video buffer is left without being cleared at the end of special playback, the HDD 1 is sought to the vicinity of the currently stopped time information (T0) position of the video data remaining in the video buffer, and the seek position Since normal playback is started after the audio information from the video data position (PR position) read out immediately before the end of special playback to the audio buffer is extracted and transferred to the audio buffer, the video can be played continuously and special playback can be performed. Since the audio buffer is not used during playback, resources can be used effectively.

  In the first embodiment, at the end of the special playback, the HDD 1 seeks to the vicinity of the currently stopped time information (T0) position of the video data remaining in the video buffer, and the data extraction from the HDD 1 is started. Even if data extraction is started by seeking the HDD 1 by the amount of data stored in the buffer 6, the same effect can be obtained.

  FIG. 3 is a block diagram of the HDD reproduction processing apparatus showing the second embodiment of the present invention.

  The video and audio combined digital data 2 read from the HDD 1 is input to the TS Demux 3 and separated into video data and audio data in the TS Demux 3. Further, a read pointer value 14 indicating the position of the digital data 2 read from the HDD 1 on the medium is stored in a Read pointer (hereinafter referred to as RP) storage area 15.

  During normal reproduction, the video / audio buffer control circuit 10 transfers the video data 4a and audio data 5a separated by the TS Demux 3 to the video buffer 6 and the audio buffer 7, respectively. The video decoder 8 takes out the video data 4b stored in the video buffer from the video buffer 6 as necessary, decodes it, and outputs it to the video playback device. The audio decoder 9 takes out the audio data 5b stored in the audio buffer from the audio buffer 7 as necessary, decodes it, and outputs it to the audio playback device.

  During special playback, the video data 4 a sent from the TS Demux 3 is transferred to the video buffer 6. The video decoder 8 takes out the video data 4b stored in the video buffer as needed from the video buffer 6, decodes it, and outputs it to the video playback device. The audio data 5 a separated by the TS Demux 3 is controlled not to be transferred to the audio buffer 7 by the video / audio buffer control circuit 10.

  When the special reproduction is finished, the video buffer amount / HDD read pointer control circuit 16 calculates the amount of data currently stored in the video buffer 6 and seeks the HDD 1 to the amount of data stored in the video buffer. Then, the HDD 1 starts to extract the combined video and audio data 2 from the seek position, and separates the extracted composite data 2 into video data and audio data within the TS Demux 3.

  The video buffer amount / HDD read pointer control circuit 16 stores the audio data 5 a separated by TS Demux 3 and sent from TS Demux 3 in the audio buffer 7. RP 14 acquired by the RP of HDD 1 from the RP storage area 15. Control is repeated until the same pointer is reached. At this time, the video data 4 a sent from the TS Demux 3 is discarded and is not stored in the video buffer 6.

  When the RP 14 of the HDD 1 reaches the RP 14 acquired by the video buffer amount / HDD read pointer control circuit 16, the normal reproduction state is entered. Thereafter, the video data 4 a and the audio data 5 a separated by the TS Demux 3 are stored in the video buffer. 6 and the audio buffer 7, respectively. The video decoder 8 takes out the video data 4b stored in the video buffer from the video buffer 6 as necessary, decodes it, and outputs it to the video playback device. The audio decoder 9 takes out the audio data 5b stored in the audio buffer from the audio buffer 7 as necessary, and outputs it to the audio playback device.

  FIG. 4 is a flowchart showing the operation of HDD playback processing in the second embodiment. Hereinafter, the processing in the case of performing normal playback → special playback → normal playback will be described with reference to the flowchart of FIG. 4.

  In the case of normal playback, the RP from the HDD 1 is saved in step S12, the data for one cluster at the PR position saved from the HDD 1 is obtained in step S1, and the read data is converted into video data and audio in step S2. Separate into data. Next, in step S4, it is determined whether or not there is a space in the video buffer. If there is no space in the buffer, step S4 is repeated until there is space in the buffer. If there is an empty buffer, data is transferred to the video buffer 6 in step S5.

  In step S3, the playback state is determined. In this case, since normal playback is performed, it is determined in step S7 whether or not the audio buffer 7 has an empty space. Repeat S7. If there is a free space in the buffer, data is transferred to the audio buffer 7 in step S8, and it is determined whether or not normal reproduction is performed in step S6. Since normal reproduction is performed, the process returns to step S12. This procedure is repeated during normal playback.

  In the case of special reproduction, the RP from the HDD 1 is stored in step S12, the data for one cluster at the PR position stored from the HDD 1 is acquired in step S1, and the read data is converted into video data and audio in step S2. Separate into data. Next, in step S4, it is determined whether or not the video buffer 6 is empty. If there is no empty buffer, step S4 is repeated until the buffer is empty. If there is an empty buffer, data is transferred to the video buffer 6 in step S5. In step S3, the playback state is determined. In this case, since the playback is special playback, the video / audio buffer control circuit 10 does not transfer the audio data to the audio buffer 7 and returns to step S12. This procedure is repeated during special playback.

  In the case of the end of the special playback, the RP from the HDD 1 is saved in step S12, the data for one cluster at the PR position saved from the HDD 1 is acquired in step S1, and the video data and audio are transmitted in TS Demux 3 in step S2. Separate into data. Next, in step S4, it is determined whether or not the video buffer 6 is empty. If there is no empty buffer, step S4 is repeated until the buffer is empty. If there is an empty buffer, data is transferred to the video buffer 6 in step S5.

  In step S3, the playback state is determined. In this case, since the special playback is completed, the current video buffer amount is acquired in step S20. In step S16, the RP stored in step S12 is acquired. In step S8, the audio data is transferred to the audio buffer 7.

  Then, in step S6, it is determined whether or not normal reproduction is performed. In this case, since special reproduction is completed, it is determined in step S17 whether or not audio data has been transferred to the RP position acquired in step S16, and the RP position has been reached. If not, audio data for the next one cluster is acquired from the HDD 1 in step S19, and the process returns to step S8. This loop is repeated until the saved RP position is reached. If it is determined in step S17 that the audio data has been transferred to the RP position, the playback state is set to normal playback in step S18, and the process returns to step S12. Thereafter, the normal reproduction process is performed.

  In the present embodiment, by storing an audio data amount that is approximately equal to the data amount currently stored in the video buffer, it is possible to obtain time information that is substantially equal to the stopped T0 position. As a result, the above-mentioned problems of the prior art are solved. In addition, since it is not necessary to store time information when shifting from special playback to normal playback, HDD seek processing is simplified.

1 is a block diagram of an HDD reproduction processing apparatus showing a first embodiment of the present invention. 4 is a flowchart illustrating an operation of HDD reproduction processing according to the first embodiment. It is a block diagram of the HDD reproduction | regeneration processing apparatus which shows the 2nd Embodiment of this invention. 4 is a flowchart illustrating an operation of HDD reproduction processing according to the first embodiment. It is a block diagram of the HDD reproduction | regeneration processing apparatus which shows a prior art. It is a flowchart which shows operation | movement of the HDD reproduction | regeneration processing in a prior art. It is a block diagram of the HDD reproduction | regeneration processing apparatus which shows another prior art. It is a flowchart which shows the operation | movement of the HDD reproduction | regeneration processing in another prior art.

Explanation of symbols

1 HDD
2 Video and audio multiplexed data 3 TS Demux (Transport Stream Demultiplexer)
4a Video data sent from TS Demux 4b Video data stored in video buffer 5a Audio data sent from TS Demux 5b Audio data stored in audio buffer 6 Video buffer 7 Audio buffer 8 Video decoder 9 Audio decoder 10 Video / Audio buffer control circuit 11 Video / audio buffer clear control circuit 12 Audio buffer data clear control circuit 13 Time control / HDD read pointer control circuit 14 Read pointer 15 Read pointer storage area 16 Latest read pointer 17 Video buffer amount / HDD read pointer Control circuit

Claims (6)

The digital data is captured from a medium storing digital data, the captured digital data is separated into video data and audio data, and the separated video data and audio data are stored in a video buffer and an audio buffer, respectively. In a digital data reproduction method for performing normal reproduction or special reproduction by taking the decoded data into a video decoder and an audio decoder according to the reproduction state and decoding them,
When switching from special playback to normal playback, the medium is sought from time information during the stop of the video data remaining in the video buffer at the end of special playback, and the medium of the medium at the end of special playback from the seek position is searched. A digital data reproduction method characterized by synchronizing video and audio at a normal reproduction start point by starting normal reproduction after storing audio data up to a read pointer position of video data in the audio buffer. The digital data is captured from a medium storing digital data, the captured digital data is separated into video data and audio data, and the separated video data and audio data are stored in a video buffer and an audio buffer, respectively. In a digital data reproduction method for performing normal reproduction or special reproduction by taking the decoded data into a video decoder and an audio decoder according to the reproduction state and decoding them,
When switching from special playback to normal playback, when the special playback ends, the medium is sought from the read pointer position of the video data of the medium by the amount of data stored in the video buffer, and the video of the medium is read from the seek position. A digital data reproducing method, wherein audio data up to a data read pointer position is stored in the audio buffer and normal reproduction is started to synchronize video and audio at the time of normal reproduction start. A medium in which digital data is stored; separation means for capturing the digital data from the medium and separating it into video data and audio data; and a video buffer and an audio buffer for storing the respective data separated by the separation means; In a digital data reproduction device comprising a video decoder and an audio decoder for fetching and decoding the data of each buffer according to a reproduction state, and having a normal reproduction function and a special reproduction function,
Means for detecting and storing the read pointer position of the video data of the medium, means for acquiring time information during the stop of the video data remaining in the video buffer at the time of completion of special reproduction, and from special reproduction to normal reproduction When switching, the position corresponding to the acquired time information in the medium is sought, and audio data from the seek position to the pointer position stored at the end of the special playback is read from the medium and the audio buffer is read And a means for detecting that audio data from the seek position to the read pointer position is stored in the audio buffer and starting normal reproduction. Data playback device. A medium in which digital data is stored; separation means for capturing the digital data from the medium and separating it into video data and audio data; and a video buffer and an audio buffer for storing the respective data separated by the separation means; In a digital data reproduction device comprising a video decoder and an audio decoder for fetching and decoding the data of each buffer according to a reproduction state, and having a normal reproduction function and a special reproduction function,
Means for detecting and storing the read pointer position of the video data of the medium, means for calculating the amount of data stored in the video buffer at the end of special playback, and the special playback when switching from special playback to normal playback The medium is sought from the pointer position stored at the end to a position corresponding to the calculated data amount, and audio data from the seek position to the pointer position stored at the end of the special playback is read from the medium. And means for storing in the audio buffer, and means for detecting that the audio data from the seek position to the read pointer position is stored in the audio buffer and starting normal reproduction. A digital data reproducing apparatus characterized by the above. Capturing the digital data from a medium storing digital data; separating the captured digital data into video data and audio data; and storing the separated video data and audio data in a video buffer and an audio buffer, respectively. A program for causing a computer to execute normal reproduction or special reproduction by taking the accumulated data into a video decoder and an audio decoder according to a reproduction state and decoding the decoded data,
A step of updating and storing a read pointer position of video data every time data for one cluster is obtained from the medium, a step of obtaining time information during suspension of video data left in the video buffer at the end of special playback, When switching from special reproduction to normal reproduction, seeking the position corresponding to the acquired time information on the medium, and audio data from the seek position to the pointer position stored at the special reproduction end time Reading from a medium and storing in the audio buffer; and detecting that audio data from the seek position to the read pointer position is stored in the audio buffer and starting normal reproduction. A program characterized by Capturing the digital data from a medium in which the digital data is stored; separating the captured digital data into video data and audio data; and storing the separated video data and audio data in a video buffer and an audio buffer, respectively. A program for causing a computer to execute normal reproduction or special reproduction by taking the accumulated data into a video decoder and an audio decoder according to a reproduction state and decoding the decoded data,
Every time data for one cluster is acquired from the medium, the step of updating and storing the read pointer position of the video data, the step of calculating the amount of data stored in the video buffer at the end of the special playback, and the special playback to the normal playback When switching, seeking the medium from the pointer position stored at the end of the special playback to a position corresponding to the calculated data amount; and the pointer stored at the end of the special playback from the seek position Reading audio data up to a position from the medium and storing it in the audio buffer, and detecting that audio data from the seek position to the read pointer position is stored in the audio buffer and starting normal playback And a step of performing Program.

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