JPWO2008023763A1 - Data processing apparatus, data processing method, and recording / reproducing system - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a data processing technique capable of reducing the rate conversion dubbing processing time for video / audio data. For example, when video / audio data rate conversion dubbing is started in a data processing apparatus of a recording / reproducing system having an AV decoder and an AV encoder, first, decoding of the first data (DA) is started in the AV decoder. When the decoding of the data (DA) is completed, a control signal is transmitted from the AV decoder. Upon receiving this control signal, the AV encoder immediately starts decoding the decoded data (DA). Next, when the decoding of the decoded data (DA) is completed in the AV encoder, a control signal is transmitted from the AV encoder. The AV encoder that has received this control signal immediately starts decoding the next data (DB). By performing the control as described above, the processing time for rate conversion dubbing can be shortened.

Description

  The present invention relates to a data processing technique for generating second video / audio data having a different data size from the first video / audio data.

  In a recording / playback system (including a data processing device) such as an HDD / DVD recorder, video / audio data (AV data) is recorded on the HDD using, for example, a moving image compression technique described in Non-Patent Document 1 below. In addition, some AV data recorded on the HDD can be dubbed on the DVD.

  The types of dubbing include high-speed dubbing that does not perform rate conversion (recompression) and rate conversion dubbing that performs rate conversion. For example, when AV data having a size larger than the recording capacity of the DVD is stored in the HDD, it can be recompressed by rate conversion dubbing and stored in the DVD.

  In such rate conversion dubbing, AV data in the HDD is sequentially decoded and reproduced and displayed, and the decoded data is sequentially encoded and compressed and recorded on a DVD.

“All about Image & Audio Compression Technology”, 3rd edition, CQ Publisher, June 1, 2001, p22-60

  However, in the above-mentioned rate conversion dubbing technique, since the decoded AV data is always displayed, the time required for this display becomes the dubbing time, and the dubbing time becomes long.

  In other words, the decoding and encoding start timing sequentially performed in the recording / playback system is synchronized with the vertical synchronization signal (even multiple) of the screen display, so rate conversion is performed in step with the progress of the screen display. The dubbing process will proceed, and dubbing time corresponding to the time required for screen display will be required.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a data processing technique that can shorten the processing time of rate conversion dubbing related to video / audio data.

  The data processing device according to the present invention is a data processing device that generates second video / audio data having a data size different from that of the first video / audio data, based on the first video / audio data, wherein Decoding means for decoding video / audio data for each predetermined data unit, and sequentially generating decoded data; and a code for encoding decoded data generated by the decoding means and generating encoded data sequentially And a construction means for constructing the second video / audio data based on the encoded data generated by the encoding means, and the decoding means each time the decoded data is generated A first transmission means for transmitting to the encoding means a first signal indicating that one decoded data has been generated, and the encoding means completes the encoding of the first decoded data. Every time, before Second decoding means for transmitting to the decoding means a second signal indicating that encoding of one decoded data has been completed. When the encoding means receives the first signal, Encoding of the decoded data is started, and when the decoding means receives the second signal, generation of the next decoded data for the first decoded data is started.

  The data processing method according to the present invention is a data processing method for generating second video / audio data having a data size different from that of the first video / audio data based on the first video / audio data, and a) the second A step of decoding one video / audio data for each predetermined data unit and sequentially generating the decoded data; b) encoding the decoded data generated in the step a) and generating encoded data sequentially And c) a construction step of constructing the second video / audio data based on the encoded data generated in the step b), wherein the step a) generates the decoded data. Each time a step of transmitting a first signal indicating that one piece of decoded data has been generated and the step b) is performed each time encoding of the one piece of decoded data is completed. Encoding of decoded data is completed A step (S8) of transmitting a second signal indicating that, when receiving the first signal, the encoding of the first decoded data is started and the step a) Then, when the second signal is received, generation of the next decoded data is started with respect to the first decoded data.

  The recording / reproducing system according to the present invention provides first video / audio data including the video data and audio data recorded on the first recording medium as second video / audio data having a data size reduced by data compression. A processing means for performing compression recording processing to be recorded on the second recording medium, and a playback means capable of playing back the first video / audio data at the same speed so as to play back at the same speed. The first video / audio data The processing time required for the compression recording processing is shorter than the reproduction time for reproducing the first video / audio data at the same speed.

  According to the data processing apparatus of the present invention, the decoding means for sequentially decoding the first video / audio data for each predetermined data unit and sequentially generating the decoded data is 1 each time the decoded data is generated. Encoding means for transmitting the first signal indicating that the decoded data is generated to the encoding means and encoding the decoded data generated by the decoding means to sequentially generate the encoded data; Each time encoding of one decoded data is completed, a second signal indicating that encoding of one decoded data is completed is transmitted to the decoding means. When the encoding means receives the first signal, it starts encoding one decoded data. When the decoding means receives the second signal, it generates the next decoded data for the one decoded data. To start. As a result, the processing time for rate conversion dubbing relating to video / audio data can be shortened.

  In addition, according to the data processing method of the present invention, in the step a) in which the first video / audio data is decoded every predetermined data unit and the decoded data is sequentially generated, the decoded data is generated each time. In step b), a first signal indicating that one piece of decoded data has been generated is transmitted, and the decoded data generated in step a) is encoded to sequentially generate encoded data. Each time the decoding of the decoded data is completed, a second signal indicating that the encoding of one decoded data is completed is transmitted. Then, in step b), when the first signal is received, encoding of one decoded data is started. In step a), when the second signal is received, the next decoded data is generated with respect to the one decoded data. To start. As a result, the processing time for rate conversion dubbing relating to video / audio data can be shortened.

  Further, according to the recording / reproducing system of the present invention, the video / audio data recorded on the first recording medium is data-compressed and recorded on the second recording medium as the second video / audio data having a reduced data size. The processing time required for the compression recording process is shorter than the reproduction time for reproducing the first video / audio data at the same speed. As a result, the processing time for rate conversion dubbing relating to video / audio data can be shortened.

  The objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

It is a block diagram which shows the principal part structure of the data processor of the recording / reproducing system which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the process in an AV decoder and AV encoder. It is a figure for demonstrating the control at the time of the rate conversion dubbing in the data processor of a recording / reproducing system. It is a flowchart which shows the fundamental operation | movement of the data processor of a recording / reproducing system. It is a figure for demonstrating the process in the AV decoder and AV encoder in the data processor of the recording / reproducing system based on Embodiment 2 of this invention. It is a figure for demonstrating the rate conversion dubbing in the data processing apparatus of a recording / reproducing system.

<Embodiment 1>
<Configuration of recording / playback system>
FIG. 1 is a block diagram showing a main configuration of a recording / reproducing system 100 according to Embodiment 1 of the present invention.

  The recording / reproducing system 100 is configured as an HDD / DVD recorder, for example, and includes a data processing apparatus 1 capable of rate conversion dubbing related to video / audio data (AV data).

  The recording / reproducing system 100 includes a hard disk (HDD) 11 that functions as a storage unit for storing AV data, an AV (Audio-Video) decoder 12 and an AV encoder 13, and includes a video memory 14 and an audio memory 15. Have. Among these, the AV decoder 12, the AV encoder 13, the video memory 14, and the audio memory 15 constitute the data processing device 1.

  For example, broadcast wave AV data output from a tuner (not shown) is recorded in the HDD 11. In this AV data recording, for example, AV data that has been compressed (compression rate α) using MPEG technology is stored in the HDD 11.

  The AV decoder 12 is a part that decodes (decodes) AV data stored in the HDD 11. In the decoding process of the AV decoder 12, AV data (first video / audio data) is decoded for each predetermined data unit (for example, GOP unit), and partial data (hereinafter simply referred to as AV data) related to this data unit. Decoded data for “partial data”) is sequentially generated. Each decoded data generated by the AV decoder 12 is divided into video data and audio data. The video data is sequentially stored in the video memory 14 and the audio data is sequentially stored in the audio memory 15. It will be memorized.

  The AV encoder 13 is a part that sequentially encodes the decoded data written from the AV decoder 12 to the video memory 14 and the audio memory 15. The encoded data sequentially generated by the AV encoder 13 is recorded on a DVD (Digital Versatile Disk) 9 set in a disk drive (not shown).

  In the encoding process in the AV encoder 13, AV data is recompressed (rate conversion) at a compression rate β higher than the compression rate α at the time of recording. Thereby, the data size of the AV data (second video / audio data) recorded on the DVD 9 is smaller than the AV data (first video / audio data) stored in the HDD 11.

  Next, processing in the AV decoder 12 and the AV encoder 13 will be described with reference to FIG.

  In the AV decoder 12, the AV data (encoded data) read from the HDD 11 in the DEMUX unit 120 is separated into video data and audio data. The video data and audio data separated by the DEMUX unit 120 are decoded by the video decoder 121 and the audio decoder 122, and the decoded data are output to the video memory 14 and the audio memory 15.

  On the other hand, in the AV encoder 13, the video data read from the video memory 14 is encoded in the video encoder 131, and the audio data read from the audio memory 15 is encoded in the audio encoder 132. Is called. Then, the video data and the audio data encoded by the video encoder 131 and the audio encoder 132 are combined in the MUX unit 130, whereby AV data (second video and audio data) as encoded data is constructed. It becomes.

  In the data processing apparatus 1 of the recording / reproducing system 100 having the above configuration, AV data (second video / audio data) having a data size different from that of the AV data is based on the AV data (first video / audio data) in the HDD 11. Can be generated. That is, rate conversion dubbing is possible in which AV data stored in the HDD 11 is recompressed (rate conversion) by the AV encoder 13 and dubbed onto the DVD 9. The control during this rate conversion dubbing will be described below.

<Control during rate conversion dubbing>
The data processing device 1 of the recording / reproducing system 100 can transmit a control signal Ca (FIGS. 1 and 2) for notifying the completion of the decoding process from the AV decoder 12 to the AV encoder 13 and a control for notifying the completion of the encoding process. The signal Cb (FIGS. 1 and 2) can be transmitted from the AV encoder 13 to the AV decoder 12. By using these control signals Ca and Cb, the data processing apparatus 1 of the recording / reproducing system 100 can perform rate conversion dubbing at high speed. The control during this rate conversion dubbing will be specifically described.

  FIG. 3 is a diagram for explaining control during rate conversion dubbing in the data processing apparatus 1 of the recording / reproducing system 100. The horizontal axis in FIG. 3 indicates the elapsed time t from the start of rate conversion dubbing. In addition, in FIG. 3, the processing time required for decoding each partial data (for example, GOP data) DA to DG constituting AV data is shown in the upper stage as a time chart, and the decoded partial data DA to DG is shown in the lower stage. The processing time required for encoding is shown as a time chart.

  When rate conversion dubbing is started in the data processing device 1 of the recording / reproducing system 100, the AV decoder 12 first starts decoding the first partial data DA. When the decoding of the partial data DA is completed, a control signal Ca (FIG. 1) is transmitted from the AV decoder 12. The AV encoder 13 that has received the control signal Ca immediately encodes the data (decoded data) DA stored in the video memory 14 and the audio memory 15 using the control signal Ca as a reference signal for starting encoding. Start.

  When the encoding of the partial data DA is completed in the AV encoder 13, the control signal Cb (FIG. 1) is transmitted from the AV encoder 13. The AV decoder 12 that has received the control signal Cb immediately starts decoding the next partial data DB stored in the HDD 11 using the control signal Cb as a reference signal for starting decoding.

  Such control using the control signals Ca and Cb is similarly performed for the partial data DB to DG of the AV data.

  As described above, the AV decoder 12 transmits the control signal (first signal) Ca indicating that one decoded data is generated to the AV encoder 13 every time the decoded data of each data DA to DG is generated. When receiving the control signal Ca, the AV encoder 13 starts encoding the decoded data. On the other hand, the AV encoder 13 also transmits a control signal (second signal) Cb indicating that encoding of one decoded data is completed to the AV decoder 12 every time encoding of the decoded data is completed, In step 12, when the control signal Cb is received, generation of the next decoded data is started for the decoded data. As a result, time can be used without waste in the decoding process and the encoding process, and rate conversion dubbing can be performed at high speed. That is, in the recording / reproducing system 100, the data processing apparatus 1 compresses the video / audio data recorded on the HDD (recording medium) 11 and records the compressed data on the DVD (recording medium) 9 as video / audio data with a reduced data size. The processing time required for the recording process can be made shorter than the normal reproduction time for reproducing the video / audio data in the HDD 11 at the normal speed using the AV decoder 12.

<Operation of Data Processing Device 1 of Recording / Reproducing System 100>
FIG. 4 is a flowchart showing the basic operation of the data processing apparatus 1 of the recording / reproducing system 100.

  First, before starting decoding of AV data in the HDD 11, data (for example, reproduction control information) necessary for decoding is acquired from the AV data (step S1).

  In step S2, the AV decoder 12 starts decoding one partial data (eg, GOP data) of AV data stored in the HDD 11.

  In step S3, the decoding of the partial data started in step S2 is completed.

  In step S4, the decoded partial data (decoded data) is expanded in the video memory 14 and the audio memory 15.

  In step S5, the AV encoder 13 is notified of the memory areas of the video memory 14 and the audio memory 15 in which the decoded data is expanded in step S4. This notification is performed by a control signal Ca (FIG. 1) that notifies the completion of decoding.

  In step S6, the AV encoder 13 that has received the notification in step S5 starts encoding the decoded data stored in the video memory 14 and the audio memory 15.

  In step S7, the decoding of the decoded data started in step S6 is completed.

  In step S8, the AV decoder 12 is notified of the memory areas of the video memory 14 and the audio memory 15 that can be expanded in the decoding of the next partial data. This notification is performed by a control signal Cb (FIG. 1) that reports the completion of encoding.

  In step S9, it is determined whether the decoding and encoding for all the AV data in the HDD 11 has been completed. If the decoding and encoding are completed, the process proceeds to step S11. If not completed, the process proceeds to step S10.

  In step S10, the AV decoder 12 acquires data (for example, reproduction control information) necessary for decoding before decoding the next partial data in the AV data.

  In step S11, since the processing of all the AV data has been completed, the processing in the AV decoder 12 and the AV encoder 13 is stopped.

  With the operation of the data processing device 1 of the recording / reproducing system 100 as described above, the AV encoder 13 that has received the control signal Ca notifying the completion of the decoding process in the AV decoder 12 immediately starts the encoding process, and AV The AV decoder 12 that has received the control signal Cb for notifying the completion of the encoding process in the encoder 13 starts the decoding process immediately, so that the rate conversion dubbing processing time for the AV data can be shortened.

<Embodiment 2>
The data processing apparatus 1A of the recording / reproducing system 100 according to Embodiment 2 of the present invention has a configuration similar to that of the data processing apparatus 1 of the recording / reproducing system 100 of Embodiment 1 shown in FIG. The configurations of the AV decoder and the AV encoder are different. That is, the AV decoder 12A and the AV encoder 13A of the data processing apparatus 1A of the recording / reproducing system 100 execute processing different from that of the first embodiment. This processing will be described below.

  FIG. 5 is a diagram for explaining processing in the AV decoder 12A and the AV encoder 13A.

  In the AV decoder 12A, AV data (encoded data) read from the HDD 11 in the DEMUX unit 120 is separated into video data and audio data and output. The video data output from the DEMUX unit 120 is input to the video decoder 121 and decoded, as in the AV decoder 12 of the first embodiment, and the decoded data is output to the video memory 14. On the other hand, unlike the first embodiment, the audio data output from the DEMUX unit 120 is directly input to the audio memory 15 without being input to the audio decoder 122.

  In the AV encoder 13A, the video encoder 131 encodes the video data read from the video memory 14, as in the AV encoder 13 of the first embodiment. On the other hand, unlike the first embodiment, the audio encoder 132 does not encode the audio data stored in the audio memory 15. Then, the video data encoded by the video encoder 131 and the audio data read directly from the audio memory 15 are synthesized by the MUX unit 130 and recorded on the DVD 9 as AV data (encoded data). It becomes.

  Only the video data of the AV data is compressed by the above processing in the AV decoder 12A and the AV encoder 13A. This will be described with reference to FIG.

  FIG. 6 is a diagram for explaining rate conversion dubbing in the data processing apparatus 1A of the recording / reproducing system 100. FIG. Here, FIG. 6 (a) shows an example of the data structure of GOP data before rate conversion dubbing, and FIG. 6 (b) shows an example of the data structure of GOP data after rate conversion dubbing. Yes.

  As shown in FIG. 6 (a), the GOP data is composed of navigation data NP in which reproduction control information and data search information are stored, video data VP, and audio data AP.

  When the GOP data shown in FIG. 6A is rate-converted dubbed in the data processing apparatus 1A of the recording / reproducing system 100, since the audio data is not decoded and encoded as described above, FIG. ), The audio data AP is not compressed, and only the video data VP is compressed.

  In such rate conversion dubbing, time information (time axis information) related to GOP data before decoding is stored inside the data processing apparatus 1A of the recording / reproducing system 100, and the stored time information is encoded. It is good to use sometimes.

  That is, if the compression rate changes at the time of encoding by the AV encoder 13, the amount of data changes compared to the original AV data, but time information as video and audio (for example, information on playback timing of a certain video / audio ( The relative time information based on the first frame)) is unchanged regardless of the change in the compression rate. Therefore, the time information in the original AV data (first video / audio data) is internally stored before decoding by the AV decoder 12, and the stored time information is used after the video data is encoded. Thus, by constructing new AV data (second video / audio data), the time and labor for generating time information of new AV data in the AV encoder 13 can be saved. Furthermore, if the time information of the original AV data is used, more faithful reproduction (reproduction) becomes possible.

  By the operation of the data processing apparatus 1A of the recording / reproducing system 100 as described above, the same effects as those of the data processing apparatus 1 of the recording / reproducing system 100 of Embodiment 1 are obtained. Furthermore, in the data processing apparatus 1A of the recording / reproducing system 100, rate conversion is performed because only the video data is decoded and encoded without decoding the audio data for the AV data (first video / audio data). The dubbing processing time can be further reduced.

  Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

Claims (5)

A data processing device for generating second video / audio data having a data size different from that of the first video / audio data based on the first video / audio data,
Decoding means (121, 122) for decoding the first video / audio data for each predetermined data unit and sequentially generating decoded data;
Encoding means (131, 132) for encoding the decoded data generated by the decoding means and sequentially generating the encoded data;
Construction means (130) for constructing the second video / audio data based on the encoded data generated by the encoding means;
With
The decoding means (121, 122)
First transmission means for transmitting to the encoding means a first signal (Ca) indicating that one decoded data has been generated each time the decoded data is generated;
And having
The encoding means (131, 132)
A second transmitting means for transmitting to the decoding means a second signal (Cb) indicating that the encoding of the first decoded data is completed each time encoding of the first decoded data is completed;
Have
When receiving the first signal (Ca), the encoding means (131, 132) starts encoding the decoded data of the first,
The data processing apparatus, wherein the decoding means (121, 122) starts generating the next decoded data for the first decoded data when the second signal (Cb) is received. The data processing apparatus according to claim 1,
The data processing apparatus, wherein the decoding means (121, 122) and the encoding means (131, 132) decode and encode only video data for the first video / audio data. The data processing apparatus according to claim 2, wherein
The construction means (130)
Means for constructing the second video / audio data using time information in the first video / audio data;
A data processing apparatus comprising: A data processing method for generating second video / audio data having a data size different from that of the first video / audio data based on the first video / audio data,
a) decoding the first video / audio data for each predetermined data unit and sequentially generating the decoded data (S2);
b) encoding the decoded data generated in the step a) and sequentially generating encoded data (S6);
c) a construction step of constructing the second video / audio data based on the encoded data generated in the step b);
With
Said step a)
A step (S5) of transmitting a first signal (Ca) indicating that one piece of decoded data is generated each time the decoded data is generated;
And having
Said step b)
A step (S8) of transmitting a second signal (Cb) indicating that encoding of the first decoded data is completed every time encoding of the first decoded data is completed;
Have
In the step b), when the first signal (Ca) is received, encoding of the decoded data of 1 is started,
In the step a), when the second signal (Cb) is received, the generation of the next decoded data for the first decoded data is started. A recording and playback system,
The first video / audio data including the video data and the audio data recorded on the first recording medium (11) is compressed and the second recording medium (9 Processing means (1, 1A) for performing compression recording processing to be recorded in
Reproducing means (12, 12A) capable of reproducing the first video / audio data at the same speed and capable of playing at the same speed.
With
The recording / reproducing system characterized in that a processing time for the compression recording process for the first video / audio data is shorter than a reproduction time for reproducing the first video / audio data at the same speed.

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