CN102934168A - Digital-data recording-and-reproducing device - Google Patents

Digital-data recording-and-reproducing device Download PDF

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Publication number
CN102934168A
CN102934168A CN2011800285833A CN201180028583A CN102934168A CN 102934168 A CN102934168 A CN 102934168A CN 2011800285833 A CN2011800285833 A CN 2011800285833A CN 201180028583 A CN201180028583 A CN 201180028583A CN 102934168 A CN102934168 A CN 102934168A
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China
Prior art keywords
video
audio
section
data
bit stream
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CN2011800285833A
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Chinese (zh)
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CN102934168B (en
Inventor
川西隆之
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Socionext Inc
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Matsushita Electric Industrial Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/806—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal
    • H04N9/8063—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2508—Magnetic discs
    • G11B2220/2516—Hard disks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2541—Blu-ray discs; Blue laser DVR discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/84—Television signal recording using optical recording
    • H04N5/85—Television signal recording using optical recording on discs or drums

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)

Abstract

In the disclosed device: the AV synchronization control section (120) controls the video decoding section (105) and the audio decoding section (107) in a manner such that the timing at which the video decoding section (105) outputs video data is synchronized with the timing at which the audio decoding section (107) outputs audio data; and the clock generating section (121) changes the rate of the AV synchronization clock in accordance with the operation mode.

Description

The numerical data record regenerator
Technical field
The present invention relates to the AV(Audio Visual to being encoded: audiovisual) the stream numerical data record regenerator of encoding again.
Background technology
(the direct record in the record regenerator and the again explanation of encoded recording)
In recent years, can be to flow accordingly (AV(Audio Visual) data with digital television broadcasting) receive and regenerate, and the numerical data record regenerator that the AV data that receive can be recorded in the storage medium is popularized.Blu-ray disc), DVD(Digital Versatile Disc hard disk drive), BD(Blu-ray Disc this storage medium is such as being HDD(Hard Disk Drive::: digital versatile disc) etc.Below, with the numerical data record regenerator also referred to as record regenerator.
When record regenerator records the AV data that receive, classify according to the processing mode of recorded data, two kinds of recording methods are arranged.
A kind of is the method that records by its former state of the data that will receive (below, be referred to as recording method A).The advantage of recording method A be can be all the time quality during with broadcasting carry out record, but shortcoming can't arbitrarily be adjusted data volume when being to record.
Another kind is the first decoding data to receiving, and then encodes, and the record method of the stream after the coding (below, be referred to as method B) again.Can adjust data volume when the advantage of recording method B is to record, be inferior to the quality when broadcasting but shortcoming is the quality of video and audio frequency.
Be equipped with both of recording method A, B in the civilian record regenerator, switching recording method A, B according to user's purpose more.
(explanation of replication actions)
In addition, the record regenerator that has is not that the broadcast data that receives is encoded again, but possesses the function that the data that record in the storage medium are encoded and recorded.
For example, in order regenerating by DVD player etc., sometimes to press the form of DVD-Video specification, the AV data to be recorded in the DVD media.The streamed MPEG-2TS(Transport of the being Stream that digital television broadcasting is adopted: transport stream), but the streamed MPEG-2PS(Program of the being Stream that DVD-Video adopts: program flow), be necessary to change streamed.
Patent documentation 1 discloses the technology that a kind of data-switching with the MPEG-TS form becomes the data of MPEG-PS form (below, be referred to as prior art A).
In addition and since the compressed format (coding form) of the recording pixel number of video data and voice data also according to digital television broadcasting with the DVD-Video specification and different, therefore be necessary to carry out data-switching by encoding again.
In addition, as other reason of changing, also has data volume.Carry out record by reducing bit rate (data volume of the time per unit of reflection), can dwindle data volume, thus can be in the limited storage medium of memory capacity the reflection of record longer time.
(synchronously involutory explanation of the AV when encoding again)
When encoding again, be necessary video data and voice data are processed respectively.Therefore, carry out first AV and separate, and video data and voice data are decoded respectively, carry out again multiplexed after the coding.For video data and voice data are not departed from when multichannel is multiple having carried out, carry out following processing.
At first, utilize the subsidiary synchronizing information of stream, carry out AV at the decoding time point and align synchronously.At this, AV refers to the synchronous of video data and voice data synchronously.In addition, AV aligns synchronously or synchronous involutory video data and the voice data of referring to of AV processed synchronously.In addition, at video data and the synchronous time point of voice data, partly you can well imagine for decoding complete video data and the complete voice data of decoding to Video coding section and audio coding.
Below just must make AV synchronously the reason of alignment describe.When receiving digital television broadcast, the situation that occurs sometimes can't normally decoding to the side in video data and the voice data or both sides (below, also be referred to as the unusual condition of decoding).The decoding unusual condition such as being because bad certain obstacle such as grade of electric wave reception state causes the part of data to lose and occur.
In record regenerator, if decoded AV data under the decoding unusual condition are not considered when regenerating synchronous, the nonsynchronous state of video data and voice data will appear, that is, and so-called sound deviation.
Equally, in record regenerator, if decoded AV data under the decoding unusual condition are encoded and do not considered when multiplexed synchronously, will generate the AV stream that departs from synchronously state.If video data and the voice data of stream before the decoding includes respectively the AV synchronizing information, even have under the state of shortcoming in the data of decoding time point, also can make video data and voice data synchronous, regenerate and coding again.
Except the shortcoming of the data due to the obstacle, for example, to the AV data carry out local segmentation and in conjunction with after the editor of coding again, video data and audio frequency are to producing deviation between the data sometimes.This is because the unit interval that consists of video data is different with the unit interval that consists of voice data.Yet, even in this case, also can utilize the AV synchronizing information to prevent synchronism deviation.
(synchronously involutory explanation of the AV during regeneration, when encoding again)
In the AV of MPEG-2 TS or MPEG-2 PS mode stream, consisting of a plurality of PES(Packetized Elementary Stream that flow: Packet Elementary Stream) in the frame head of bag, show PTS(Presentation Time Stamp as temporal information: presentation time stamp).
PTS represents video data and voice data demonstration separately constantly (Displaying timer).By utilizing PTS, even in situation about processing that video data and voice data are decoded respectively, also can according to this time information, by to AV output device (TV or AV amplifier) output video data and voice data, carry out involutory synchronously during regeneration.
Be used for obtaining system's reference time of output timing, be referred to as STC(System Time Clock).STC is every process carries out rising counting to value during the stipulated time counter.
In the following description, video also is referred to as VPTS with PTS.In addition, in the following description, audio frequency also is referred to as APTS with PTS.
By the control lsb decoder so that VPTS and APTS respectively the timing consistent with the value of STC carry out video data and voice data output, thereby the synchronous involutory state of the AV that becomes video data and voice data.
Decoded video data and voice data be respectively, is stored in first in the corresponding output buffer, then by video efferent and audio output part, is sent from each impact damper.
Video efferent and audio output part are with the clock synchronous ground output data that provided by common clock generating unit.Therefore, video data and voice data become the state of synchronous alignment when regeneration.
When encoding, video data and the voice data sent respectively by video efferent and audio output part are stored in respectively corresponding coding section with in the impact damper again.
Video coding section and audio coding section encode with the data of impact damper one by one to offering corresponding coding section respectively, and corresponding coding output is stored the stream after encoding again with impact damper.
The multiplexed section of AV, the output of a side coding is carried out with the audio stream of storing in the impact damper with the video flowing of storing in the impact damper and the opposing party's coding output multiplexed, thereby the PS of generation MPEG-2 or TS flow.As mentioned above, be that AV is synchronous owing to be input to the time point of coding section, therefore the rear stream that generates of coding also is that AV is synchronous again.
Patent documentation 1: TOHKEMY 2003-111023 communique
But, in prior art A, the stream in the regeneration is encoded in real time again.Therefore, under utilizing the situation of encoding again when prior art A processes synchronously to video data and voice data, the recovery time of encode again required time and stream is roughly the same.That is, the speed of coding is fixed again.
Because the speed of coding is fixed again, the situation that therefore exists flexible correspondence for example must encode again fast, the perhaps slow low speed situation of encoding again etc. for the power consumption of restraining device.
Summary of the invention
The present invention is the technology of developing in view of described problem points, its purpose be to provide a kind of have can be when video data and voice data be processed synchronously the numerical data record regenerator of the structure of the again coding rate of change convection current.
In order to reach described purpose, the numerical data record regenerator of a form of the present invention is processed by a multiplexed AV bit stream the first video bit stream and the first audio bitstream, this first video bit stream is that video data is encoded and the bit stream that generates, and this first audio bitstream is that voice data is encoded and the bit stream that generates.Described numerical data record regenerator has two kinds of mode of operations at least, described the first video bit stream comprises video synchronizing information, described the first audio bitstream comprises audio synchronization information, and described video synchronizing information and described audio synchronization information are respectively the information of processing synchronously for to described video data and described voice data.
Described numerical data record regenerator possesses: the AV separation unit, from a described AV bit stream, extract described the first video bit stream and described the first audio bitstream; The video synchronizing information extraction unit is extracted described video synchronizing information from described the first video bit stream; The audio synchronization information extraction unit is extracted described audio synchronization information from described the first audio bitstream; Video decode section by described the first video bit stream is decoded to obtain described video data, and exports this video data; Audio decoder section by described the first audio bitstream is decoded to obtain described voice data, and exports this voice data; The clock generating unit generate to be used for the AV that described video data and described voice data are processed is synchronously used clock synchronously; AV synchro control section carries out be used to the control that described video data and described voice data are processed synchronously.Described AV synchro control section utilizes described video synchronizing information, described audio synchronization information and described AV to use synchronously clock, control described video decode section and described audio decoder section so that the output that described video decode section exports described video data regularly and the output of exporting described voice data of described audio decoder section regularly become synchronously.
Described numerical data record regenerator also possesses: the video efferent, using clock with the video output of clock synchronous synchronously with described AV, export accordingly described video data; Audio output part using clock with the audio frequency output of clock synchronous synchronously with described AV, is exported described voice data accordingly; Video coding section by to the described coding video data by described video efferent output, generates the second video bit stream; Audio coding section by to being encoded by the described voice data of described audio output part output, generates the second audio bitstream; The multiplexed section of AV, multiplexed by described the second video bit stream and described the second audio bitstream are carried out, generate the 2nd AV bit stream.Described clock generating unit, further, the kind according to the mode of operation of described numerical data record regenerator changes the speed that described AV uses clock synchronously.
That is, described AV synchro control section controls described video decode section and audio decoder section so that the output that described video decode section exports described video data regularly and the output of exporting described voice data of described audio decoder section regularly become synchronously.
That is, video data and voice data are processed synchronously.
In addition, video decode section is by decoding to obtain video data to the first video bit stream by multiplexed in the AV bit stream, and audio decoder section is by decoding to obtain voice data to described the first audio bitstream by multiplexed in the AV bit stream.
Respectively described video data and voice data are encoded by Video coding section and audio coding section.Generate thus the second video bit stream and the second audio bitstream.
That is, decoded by described video decode section, described audio decoder section, Video coding section and the convection current of audio coding section, again the data that obtain by decoding are encoded.That is, convection current is encoded again.
Described clock generating unit changes the speed that described AV uses clock synchronously according to mode of operation.The video efferent is exported described video data corresponding to using clock with the video output of clock synchronous synchronously with AV.In addition, audio output part is exported described voice data corresponding to using clock with the audio frequency output of clock synchronous synchronously with AV.
Therefore, along with AV uses the change of the speed of clock synchronously, the output of video data and voice data regularly also changes.That is, Video coding section and audio coding section change the generation time that video data and voice data are encoded respectively.That is, along with AV uses the change of the speed of clock synchronously, the again coding rate of convection current also changes.
According to more than, can be when video data and voice data be processed synchronously, the again coding rate of change convection current.
In addition, be preferably, described numerical data record regenerator possesses as the first mode of mode of operation and the second pattern, this first mode is used for regenerating a described AV bit stream, this second pattern is used for a described AV bit stream is decoded, and the data that obtain by this decoding are encoded.Described clock generating unit, so that be the speed that the described AV that generates in the situation of described the second pattern uses clock synchronously in the mode of operation of described numerical data record regenerator, becoming than the mode of operation at described numerical data record regenerator is the fireballing speed that the described AV that generates in the situation of described first mode uses clock synchronously.
In addition, be preferably, described video synchronizing information, described audio synchronization information and described AV represent respectively the value that described AV synchro control section utilizes with clock synchronously when controlling, and described AV increases along with the process of time with the value shown in the clock synchronously.Described AV synchro control section, (a) the described video decode of control section, so that described video decode section uses the described video data of the consistent timing output of the value shown in the clock synchronously in the value shown in the described video synchronizing information and described AV, (b) the described audio decoder of control section is so that described audio decoder section uses the described voice data of the consistent timing output of the value shown in the clock synchronously in the value shown in the described audio synchronization information and described AV.
The numerical data record regenerator of another form of the present invention to the first video bit stream and the first audio bitstream by a multiplexed AV(Audio Visual: audiovisual) bit stream is processed, this first video bit stream is that video data is encoded and the bit stream that generates, and this first audio bitstream is that voice data is encoded and the bit stream that generates.Described the first video bit stream comprises video synchronizing information, and described the first audio bitstream comprises audio synchronization information.Described numerical data record regenerator possesses: the AV separation unit, from a described AV bit stream, extract described the first video bit stream and described the first audio bitstream; The video synchronizing information extraction unit is extracted described video synchronizing information from described the first video bit stream; The audio synchronization information extraction unit is extracted described audio synchronization information from described the first audio bitstream; Video decode section by described the first video bit stream is decoded to obtain described video data, and exports this video data; Audio decoder section by described the first audio bitstream is decoded to obtain described voice data, and exports this voice data; AV synchro control section carries out be used to the control that described video data and described voice data are processed synchronously; Replace the video data generating unit, generate and replace video data, this replaces video data to replace the complete video data of decoding, and this complete video data of decoding is by the obtained video data of decoding by described video decode section; Replace the voice data generating unit, generate and replace voice data, this replaces voice data to replace the complete voice data of decoding, and this complete voice data of decoding is the voice data of being obtained by decoding by described audio decoder section; Video coding section by to the complete video data of described decoding or described replacement coding video data, generates the second video bit stream; Audio coding section by the complete voice data of described decoding or described replacement voice data are encoded, generates the second audio bitstream; The multiplexed section of AV, multiplexed by described the second video bit stream and described the second audio bitstream are carried out, generate the 2nd AV bit stream.
Described video synchronizing information and described audio synchronization information are respectively the information of controlling for to described Video coding section and described audio coding section.Described AV synchro control section compares described video synchronizing information and described audio synchronization information, (a) control described Video coding section according to this comparative result, so that described Video coding section encodes to the complete video data of described decoding and the some of described replacement video data, and (b) control described audio coding section according to this comparative result, so that described audio coding section encodes to the complete voice data of described decoding and the some of described replacement voice data, thus the timing that described Video coding section is encoded, the timing of encoding with described audio coding section becomes synchronously.
Namely, described AV synchro control section compares described video synchronizing information and described audio synchronization information, (a) control described Video coding section according to this comparative result, so that described Video coding section encodes to the complete video data of described decoding and the some of described replacement video data, and (b) control described audio coding section according to this comparative result, so that described audio coding section encodes to the complete voice data of described decoding and the some of described replacement voice data, thus the timing that described Video coding section is encoded, the timing of encoding with described audio coding section becomes synchronously.
That is, video data and voice data are processed synchronously.
In addition, the decoded data (for example, video data) that form afterwards of Video coding section and the convection current of audio coding section (for example, the first video bit stream) are encoded.That is, described video decode section, described audio decoder section, Video coding section and the convection current of audio coding section are encoded again.
In addition, according to this form, the timing that described video decode section, described audio decoder section, Video coding section and audio coding section carry out respectively corresponding processing (coding, decoding etc.) is not carried out synchro control.That is, described video decode section, described audio decoder section, Video coding section and audio coding section non-synchronously move respectively.
Therefore, for example, the speed of processing respectively by changing described video decode section, described audio decoder section, Video coding section and audio coding section can change the again coding rate of convection current.
According to more than, the numerical data record regenerator possesses can be when processing video data and voice data synchronously, the structure of the again coding rate of change convection current.
In addition, be preferably, the value of utilizing when described video synchronizing information and described audio synchronization information represent respectively that the described AV of looking listens synchro control section to control, described AV synchro control section, satisfy in the situation of rated condition in the value that obtains according to the value shown in the value shown in the described video synchronizing information and the described audio synchronization information, carry out some in the following processing, (c) the described Video coding of control section, so that described Video coding section is to the processing of described replacement coding video data, and, (d) the described audio coding of control section is so that the processing that described audio coding section encodes to described replacement voice data.
In addition, be preferably, described rated condition refers to, the absolute value of the difference of the value shown in the value shown in the described video synchronizing information and the described audio synchronization information is the above condition of the synchronization threshold of regulation, described AV synchro control section, (e) described absolute value be more than the described synchronization threshold and the value shown in the described video synchronizing information than the little situation of the value shown in the described audio synchronization information under, control described Video coding section, so that described Video coding section is to described replacement coding video data, (f) described absolute value be more than the described synchronization threshold and the value shown in the described audio synchronization information than the little situation of the value shown in the described video synchronizing information under, control described audio coding section, so that described audio coding section encodes to described replacement voice data.
In addition, in the present invention, a whole or part that consists of a plurality of textural elements of this type of numerical data record regenerator can be by system LSI (Large Scale Integration: large scale integrated circuit) realize.
In addition, can realize the present invention as the digital data recording method of step by the action of the characteristic component part that possessed with the numerical data record regenerator.In addition, can realize the present invention by the program that makes computing machine carry out each step that comprises in the described digital data recording method.The recording medium of embodied on computer readable that in addition, can be by storing said program is realized the present invention.In addition, can send this program by the transmission medium of internet etc.
By the present invention, can be when video data and voice data be processed synchronously, the again coding rate of change convection current.
Description of drawings
Fig. 1 is the block scheme of structure of the numerical data record regenerator of expression embodiment 1.
Fig. 2 is the block scheme of structure of the numerical data record regenerator of expression embodiment 2.
Fig. 3 is the block scheme of characteristic first functional structure of representative digit data recording/reproducing device.
Fig. 4 is the block scheme of distinctive second functional structure of representative digit data recording/reproducing device.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are described.In the following description, give identical symbol for identical parts, the title of these parts and function are also identical.Therefore, repetition is not carried out in the detailed description about these parts.
＜embodiment 1＞
(structure of numerical data record regenerator)
Fig. 1 is the block scheme of structure of the numerical data record regenerator 1000 of expression embodiment 1.In Fig. 1, for convenience of explanation, also shown the storage medium 101 that does not comprise in the numerical data record regenerator 1000.
Numerical data record regenerator 1000 possesses as the common regeneration mode of mode of operation and coding mode again.Usually regeneration mode is be used to the mode of operation of carrying out the processing (below, also being referred to as usually regeneration processing) by the stream (data) that is encoded is decoded regenerate (output).That is, common regeneration mode is the first mode for regeneration AV bit stream.
Coding mode is to decode be used to the stream (data) that carries out being encoded again, and the mode of operation of the processing that decoded data are encoded again (below, also be referred to as the processing of encoding again).That is, coding mode is for the AV bit stream is decoded again, and the second pattern that the data that obtain by this decoding are encoded.
Mode of operation at numerical data record regenerator 1000 is in the situation of common regeneration mode, the processing of usually regenerating.Mode of operation at numerical data record regenerator 1000 is again in the situation of coding mode, the processing of encoding again.
Numerical data record regenerator 1000 is AV regenerating units of HDD register etc.Numerical data record regenerator 1000 is not limited to the HDD register, so long as have common regeneration mode and the device of coding mode again, can be the device of any type.
As shown in Figure 1, numerical data record regenerator 1000 possesses AV separation unit 102, input video bit stream buffer part 103, input audio bitstream buffer part 104, video decode section 105, video output data buffer part 106, audio decoder section 107, audio frequency data output buffer section 108, video efferent 109, Video coding input block section 110, audio output part 111 and audio coding input block section 112.
Numerical data record regenerator 1000 also possesses multiplexed 117 of Video coding section 113, coded video bit stream buffer part 114, audio coding section 115, coded audio bit stream buffer part 116 and AV.
Blu-ray disc), DVD(Digital Versatile Disc storage medium 101 is BD(Blu-ray Disc:: digital versatile disc) etc.
In addition, storage medium 101 also can be HDD(Hard Disk Drive: hard disk drive) etc.In the case, storage medium 101 can also be comprised in the numerical data record regenerator 1000.
Storing in the storage medium 101 becomes the again AV bit stream AVST1 of the object of coding.AV bit stream AVST1 is the stream that is encoded.This AV bit stream AVST1 is coding form according to the rules, and video bit stream VST1 and audio bitstream AST1 are by the multiplexed stream that forms.The coding form of this regulation for example is MPEG-2 TS.
In addition, the coding form of regulation is not limited to MPEG-2 TS, can also be other coding form.Video bit stream VST1 and audio bitstream AST1 are respectively the stream that is encoded.
AV bit stream AVST1 is by a plurality of PES(Packetized Elementary Stream: Packet Elementary Stream) bag consists of.The frame head of PES bag illustrates PTS(Presentation Time Stamp: the displaying time mark).PTS is the synchronizing information of using when processing synchronously.PTS is every process carries out rising counting to value during the stipulated time counter.
That is, video bit stream VST1 and audio bitstream AST1 are made of a plurality of PES respectively.That is, video bit stream VST1 and audio bitstream AST1 comprise respectively a plurality of PTS.
In the following description, the PTS that comprises among the video bit stream VST1 is called the VPTS(video synchronizing information).In addition, in the following description, the PTS that comprises among the audio bitstream AST1 is called the APTS(audio synchronization information).
That is, VPTS and APTS are respectively every process carries out rising counting to value during the stipulated time counters.In addition, VPTS(video synchronizing information) and the APTS(audio synchronization information) be respectively the information of processing synchronously for to video data and voice data.
Video bit stream VST1 is the stream of video data VD1 being encoded and generating by moving picture coding form according to the rules.This moving picture coding form for example is MPEG2 TS.Video data VD1 is animation data.That is, the video bit stream VST1 as the first video bit stream comprises the VPTS(video synchronizing information).
In addition, the moving picture coding form is not limited to MPEG2 TS, can also be other coding form.
Audio bitstream AST1 is the stream of voice data AD1 being encoded and generating by voice coding form according to the rules.This voice coding form is AAC(Advanced Audio Coding: Advanced Audio Coding).Voice data AD1 is speech data.That is, the audio bitstream AST1 as the first audio bitstream comprises the APTS(audio synchronization information).
In addition, the voice coding form is not limited to AAC, can also be other voice coding form.
The decoding of the moving picture coding form responding that video decode section 105 uses when carrying out the coding with video bit stream VST1 is processed, and comes video bit stream VST1 is decoded.This moving picture coding form for example is MPEG2 TS.
The decoding of the voice coding form responding that audio decoder section 107 uses when carrying out the coding with audio bitstream AST1 is processed, and comes audio bitstream AST1 is decoded.This voice coding form for example is AAC.
The moving picture coding form that the moving picture coding form that Video coding section 113 uses by from the coding of video bit stream VST1 the time is different (below, be referred to as again coding form of animation), come the complete coding video data of decoding.Animation again coding form for example is MPEG2 PS.
In addition, animation again coding form is not limited to MPEG2 PS, also can be other coding form (for example, H.264/AVC).
At this, the identic moving picture coding form of moving picture coding that Video coding section 113 can use according to the coding of video bit stream VST1 time the, change encoding condition (for example, bit rate), the processing of encoding.
Audio coding section 115, the voice coding form that the voice coding form that can use according to from the coding of audio bitstream AST1 the time is different (below, be referred to as again coding form of voice), the complete voice data of decoding is encoded.Voice again coding form for example are MPEG2PS.
In addition, voice again coding form are not limited to MPEG2 PS, also can be other coding forms (for example, AAC(Advanced Audio Coding)).
In addition, the identic audio coding form of audio coding that audio coding section 115 can use according to the coding of audio bitstream AST1 time the, change encoding condition (for example, bit rate), the processing of encoding.
About the processing that video efferent 109 and audio output part 111 are carried out respectively, details aftermentioned.In regeneration was processed usually, video efferent 109 and audio output part 111 outputed to not shown handling part with the data of handling respectively.In usually regeneration is processed, form from AV separation unit 102 to video efferent 109 and the data till the audio output part 111 are processed path (below, be referred to as usually to regenerate the path).
In coding was processed again, video efferent 109 and audio output part 111 outputed to Video coding input buffer part 110 and audio coding input buffer part 112 with the data of handling respectively.In coding is processed again, form data till 102 to AV multiplexed 117 of the AV separation units and process path (below, also be referred to as to encode again process path).
Coding processing path comprises common regeneration path again.That is, in common regeneration processing and during coding is processed again, the path quilt of usually regenerating is common.
Input video bit stream buffer part 103, input audio bitstream buffer part 104, video output data buffer part 106, audio frequency data output buffer section 108, Video coding input block section 110, audio coding input block section 112, coded video bit stream buffer part 114 and coded audio bit stream buffer part 116 are respectively the impact dampers for temporary storaging data.
In addition, the processing about multiplexed 117 of AV separation unit 102 and AV sees below and states.
Numerical data record regenerator 1000 also possesses video synchronizing information extraction unit 118, audio synchronization information extraction unit 119, AV synchro control section 120 and clock generating unit 121.
Processing about video synchronizing information extraction unit 118, audio synchronization information extraction unit 119, AV synchro control section 120 and clock generating unit 121 are carried out respectively sees below and states.
(explanation of the AV data path during coding is processed again (coding is processed the path again))
Below, utilize Fig. 1 that the flow process that coding is processed is described again.
In coding was processed again, at first, AV separation unit 102 was read the AV bit stream AVST1 that is stored in the storage medium 101.AV separation unit 102 is extracted video bit stream VST1 and audio bitstream AST1 from AV bit stream AVST1.
AV separation unit 102 stores video bit stream VST1 in the input video bit stream buffer part 103 into, and audio bitstream AST1 is stored in input audio bitstream buffer part 104 notes.
Video decode section 105 by control according to the aftermentioned of AV synchro control section 120 in the input video bit stream buffer part 103 storage video bit stream VST1 encode, thereby obtain video data VD1.Video data VD1 is the complete video data of decoding.
And video decode section 105 controls output video data VD1 according to the aftermentioned of AV synchro control section 120, and this video data VD1 is stored in the video output data buffer part 106.
Audio decoder section 107, with the processing of video decode section 105 side by side, come the audio bitstream AST1 that is stored in the input audio bitstream buffer part 104 is decoded by the control according to AV synchro control described later section 120, thereby obtain voice data AD1.Voice data AD1 is the complete voice data of decoding.
And audio decoder section 107 controls outputting audio data AD1 according to the aftermentioned of AV synchro control section 120, and this voice data AD1 is stored in the audio frequency data output buffer section 108.
Video efferent 109 is exported this video data VD1 after reading the video data VD1 that is stored in the video output data buffer part 106, and this video data VD1 is stored into during Video coding input block section 110 deposits.That is, video data VD1 by video efferent 109, is transferred to Video coding input block section 110 from video output data buffer part 106.
Audio output part 111 is exported this voice data AD1 after reading to put the voice data AD1 that is stored in the audio frequency data output buffer section 108, and this voice data AD1 is stored in the audio coding input buffer part 112.That is, voice data AD1 by audio output part 111, is transferred to audio coding input buffer part 112 from audio frequency data output buffer section 108.
Video coding section 113 is by encoding generating video bit stream VST2 to the video data VD1 that is stored in the Video coding input buffer part 110.That is, Video coding section 113 generates the video bit stream VST2 as the second video bit stream by the video data VD1 by 109 outputs of video efferent is encoded.
That is, 113 couples of video data VD1 that obtain by decoding of Video coding section encode again.
And Video coding section 113 stores video bit stream VST2 into coded video bit stream buffer part 114.
Audio coding section 115 encodes by the voice data AD1 of storage in the encode audio input buffer part 112, generates audio bitstream AST2.That is, audio coding section 115 generates the audio bitstream AST2 as the second audio bitstream by the voice data AD1 by audio output part 111 outputs is encoded.
That is, 115 couples of voice data AD1 that obtain by decoding of audio coding section encode again.
And audio coding section 115 frequently bit stream AST2 stores in the coded audio bit stream buffer part 116.
Multiplexed 117 of AV undertaken multiplexed by the audio bitstream AST2 to storage in the video bit stream VST2 of storage in the coded video bit stream buffer part 114 and the coded audio bit stream buffer part 116, generate AV bit stream AVST2.
Multiplexed 117 of AV is such as carrying out multiplexed according to the form of MPEG-2 etc.And multiplexed 117 of AV stores AV bit stream AVST2 in the storage medium 101 into.
Process by above again coding, the video data VD1 and the voice data AD1 that comprise among the AV bit stream AVST1 are encoded again.
(explanation that AV is synchronous)
In above again coding is processed, illustrated that the AV that utilizes synchronizing information (PTS) to carry out is synchronous.
Among the video bit stream VST1 that video synchronizing information extraction unit 118 is stored, extract the VPTS as video synchronizing information from input video bit stream buffer part 103, and this VPTS is sent to AV synchro control section 120.
In addition, among the audio bitstream AST1 of audio synchronization information extraction unit 119 storage from input audio bitstream buffer part 104, extract the APTS as audio synchronization information, and this APTS is sent to AV synchro control section 120.
Clock generating unit 121 generates the AV that is used for video data and voice data are processed synchronously and uses synchronously clock AVCK, and this AV is sent to AV synchro control section 120 with clock AVCK synchronously.AV is every process carries out rising counting to value during the stipulated time counter with clock AVCK synchronously.That is, AV increases along with the process of time with the value shown in the clock AVCK synchronously.STC(System Time Clock when AV has data reproduction (decoding) with clock AVCK synchronously: effect system clock).
That is, VPTS(video synchronizing information), APTS(audio synchronization information) and AV synchronously with clock AVCK represent that respectively AV synchro control section 120 controls the time value utilized.
The control that AV synchro control section 120 is processed video data VD1 and voice data AD1 synchronously.Specifically, AV synchro control section 120 utilizes the VPTS(video synchronizing information), the APTS(audio synchronization information) and AV use synchronously clock AVCK, control video decode section 105 and audio decoder section 107 are so that the output of the output of the 105 output video data VD1 of video decode section timing and the 107 outputting audio data AD1 of audio decoder section regularly becomes synchronously.
More specifically, control video decode sections of AV synchro control section 120 105 are so that control video decode section 105 is at the VPTS(video synchronizing information) shown in value and AV use synchronously the consistent timing of the value shown in the clock AVCK, output video data VD1.
In addition, the described audio decoder of AV synchro control section 120 control section 107 is so that audio decoder section 107 is at the APTS(audio synchronization information) shown in value and AV use synchronously the consistent timing of the value shown in the clock AVCK, outputting audio data AD1.
For example, have unusually at audio bitstream AST1, the value of APTS is to depart from the situation of value value, large that AV uses clock AVCK synchronously, and AV synchro control section 120 makes audio decoder section 107 stop decoding and processes, until AV is increased to consistent with the value of APTS with the value of clock AVCK synchronously.
In addition, for example, value at APTS is to depart from AV to use synchronously in clock AVCK situation value, little value, AV synchro control section 120 is by control audio decoder section 107, audio decoder section 107 is not decoded to full acoustic frequency bit stream AST1, and skip (jump), thereby make the value of the APTS of audio bitstream AST1 be increased to the value that AV uses clock AVCK synchronously.
At this, when the value of the VPTS of video bit stream VST1 has in the unusual situation, AV synchro control section 120 will also carry out the control identical with the described control of carrying out for audio decoder section 107 to video decode section 105.
AV synchro control section 120 even the AV bit stream before encoding again has damaged and can't normally obtain in the situation of PTS, when normal AV bit stream is transfused to, also can make AV recover synchronously by carrying out aforesaid control.
(explanation of AV efferent)
Video efferent 109 and audio output part 111 are by the efferent of dual-purpose for regeneration usefulness.Clock generating unit 121 will offer video efferent 109 and audio output part 111 by the same clock that same clock generation source generates.It for example is crystal oscillator that clock generates the source.
In the following description, will offer from clock generating unit 121 clock of video efferent 109, be recited as video clock VCK.In addition, in the following description, will offer from clock generating unit 121 clock of audio output part 111, be recited as audio frequency clock ACK.
Clock generating unit 121 generates as synchronously using clock AVCK with clock VCK and audio frequency with the described AV of the synchronous clock of clock ACK with video.That is the described AV that, is generated by clock generating unit 121 with clock AVCK is and video clock VCK and the audio frequency synchronous clock of clock ACK synchronously.
Video efferent 109 is read the video data VD1 that is stored in the video output data buffer part 106 and is exported this video data VD1 afterwards according to (correspondence) video clock VCK, and this video data VD1 is stored in the Video coding input buffer part 110.
Audio output part 111 is read the voice data AD1 that is stored in the audio frequency data output buffer section 108 and is exported this voice data AD1 afterwards, and this voice data AD1 is stored sound in frequency coding input buffer part 112 according to (correspondence) audio frequency clock ACK.
Under normally decoded situation about processing in video decode section 105 and audio decoder section 107, video data VD1 and voice data AD1 were roughly exported simultaneously.That is, in the case, video data VD1 and voice data AD1 are exported synchronously.
That is, video efferent 109 under the decoding of video decode section 105 is processed by the situation of normally carrying out, is exported the complete data (video data VD1) of decoding, and described video data VD1 is stored in the Video coding input buffer part 110.
On the contrary, process in the situation that the control because of AV synchro control section 120 stops in the decoding of video decode section 105,109 outputs of video efferent replace video datas.Replacing video data for example is the data that the final video frame (up-to-date frame of video) before stopping to be processed in decoding.
In addition, audio output part 111 is processed in the situation of normally carrying out in the decoding of audio decoder section 107, exports the complete data (voice data AD1) of decoding, and voice data AD1 is stored in the audio coding input buffer part 112.
On the contrary, process in the situation that the control because of AV synchro control section 120 stops in the decoding of audio output part 111, audio output part 111 outputs replace voice datas.Replacing voice data for example is without sound data.
As mentioned above, can export all the time data respectively from video efferent 109 and audio output part 111.Thus, if the data in the decoding just can keep the synchronous state of AV.Therefore, Video coding section 113 and audio coding section 115 only by to not considering that the data that are provided in the synchronous situation of AV encode one by one, just can keep respectively (corresponding to) AV is synchronous.
(can realize the explanation of the structure that fast coding is processed)
In the structure of the numerical data record regenerator 1000 of described Fig. 1, in order to encode again fast, must to carry out rapidly data at the each several part that consists of again coding and process the path and process.This each several part refers to multiplexed 117 of AV separation unit 102, video decode section 105, audio decoder section 107, video efferent 109, audio output part 111, Video coding section 113, audio coding section 115 and AV.
In addition, in described each several part, about multiplexed 117 of AV separation unit 102 and AV, coding is processed or decoding is processed and compared, processed and need not to carry out complicated calculation, therefore can get rid of outside system's link.
About video decode section 105 and Video coding section 113, process owing to need to carry out complicated calculation to video data, therefore can consist of video decode section 105 and Video coding section 113 by quick arithmetic unit or computing special circuit.
In addition, about audio decoder section 107 and audio coding section 115, process owing to need to carry out complicated calculation to voice data, therefore can be by arithmetic unit or computing special circuit consist of audio decoder section 107 and audio coding section 115 fast.
Thus, can be when keeping AV synchronous, according to the processing of encoding again fast of the processing power of video decode section 105, audio decoder section 107, audio decoder section 107 and audio coding section 115.
In addition, in the situation about processing of encoding again, the AV that is generated by clock generating unit 121 synchronously with clock AVCK, video with clock VCK and audio frequency with clock ACK all be process than common regeneration in the fast clock of (frequency height) of clock of use.
That is, clock generating unit 121 is generating respectively different clocks in regeneration processing and the processing of encoding again usually.That is, process from common regeneration in the situation that is switched to again coding processing in the processing that numerical data record regenerator 1000 carries out, the clock that is generated by clock generating unit 121 is switched to faster clock.
In other words, clock generating unit 121, making mode of operation at numerical data record regenerator 1000 is the speed that AV that the second pattern namely generates in the situation of coding mode again uses clock AVCK synchronously, and becoming than the mode of operation at numerical data record regenerator 1000 is that first mode is the fireballing speed that the AV that generates in the situation of common regeneration mode uses clock AVCK synchronously.
Namely, clock generating unit 121, making mode of operation at numerical data record regenerator 1000 is the frequency that AV that the second pattern namely generates in the situation of coding mode again uses clock AVCK synchronously, becomes mode of operation at numerical data record regenerator 1000 and be first mode and be the high frequency of frequency that the AV that generates in the situation of common regeneration mode uses clock AVCK synchronously.
Thus, in coding is processed again, can make video decode section 105 and audio decoder section 107 rapid to the decoding processing speed of velocity ratio in regeneration is processed usually of the decoding data of correspondence respectively.Its result in coding is processed again, can make video efferent 109 and audio output part 111 export respectively the speed of corresponding data, and situation about processing than common regeneration improves.Therefore, can make Video coding section 113 and audio coding section 115 rapid to the speed that the data of correspondence are encoded again respectively.
In addition, clock generating unit 121 is all right, make the AV that in the mode of operation of numerical data record regenerator 1000 situation for coding mode again, generates use synchronously the speed of clock AVCK, become than in this mode of operation being the slow-footed speed that the AV that generates in the situation of common regeneration mode uses clock AVCK synchronously.Thus, can reduce the consumed power of the numerical data record regenerator 1000 when processing of encoding again.
That is, clock generating unit 121 changes the speed (frequency) that AV uses clock AVCK synchronously according to the kind of the mode of operation of numerical data record regenerator 1000.
As mentioned above, in the again coding of present embodiment was processed, the clock that uses when using the common regeneration of ratio to process is clock faster, and video efferent 109 and audio output part 111 are moved respectively.
Therefore, when can process synchronously video data and voice data, realize the rapid of speed that convection current is encoded again.That is, when can process synchronously video data and voice data, the speed that the change convection current is encoded again.
In addition, as mentioned above, when coding is processed again, also use the described common regeneration path that in the processing of usually regenerating, is used.That is, in usually regenerate processing and the processing of encoding again, share the common path of regenerating.
Therefore, according to the numerical data record regenerator 1000 of present embodiment, for the structure of disclosed record regenerator in the prior art, only pass through structure modify slightly, just can realize the processing of encoding again fast.
＜embodiment 2＞
(structure of numerical data record regenerator)
Fig. 2 represents the block scheme of structure of the numerical data record regenerator 1000A of embodiment 2.In addition, in Fig. 2, for convenience of explanation, also shown the storage medium 101 that does not comprise among the numerical data record regenerator 1000A.
Compare with the numerical data record regenerator 1000 of Fig. 1, the difference of numerical data record regenerator 1000A is, replace video decode section 105, audio decoder section 107, Video coding section 113, audio coding section 115 and AV synchro control section 120, possesses the 105A of video decode section, the 107A of audio decoder section, the 113A of Video coding section, the 115A of audio coding section and the AV synchro control 120A of section, also possess the video data of replacement generating unit 211 and replace voice data generating unit 212, and do not possess video efferent 109, audio output part 111 and clock generating unit 121.
Other structure of numerical data record regenerator 1000A is identical with numerical data record regenerator 1000, therefore omits and describes in detail.
Compare with video decode section 105, the difference of the 105A of video decode section is, is not subjected to the control of outside (for example, the 120A of AV synchro control section).Other function of the 105A of video decode section is identical with video decode section 105, therefore omits and describes in detail.That is, the 105A of video decode section has and carries out the function that the decoding identical with video decode section 105 processed.
Compare with audio decoder section 107, the difference of the 107A of audio decoder section is, is not subjected to the control of outside (for example, the 120A of AV synchro control section).Therefore other function of the 107A of audio decoder section and audio decoder section 107 states omit and describe in detail.That is, the 107A of audio decoder section has and carries out the function that the decoding identical with audio decoder section 107 processed.
Compare with Video coding section 113, the difference of the 113A of Video coding section is that the 12A of section controls by the AV synchro control.Other function of the 113A of Video coding section is identical with Video coding section 113, therefore omits and describes in detail.That is, the 113A of Video coding section carries out the coding identical with Video coding section 113 and processes.
Compare with audio coding section 115, the difference of the 115A of audio coding section is to be controlled by the AV synchro control 120A of section.Other function of the 115A of audio coding section is identical with audio coding section 115, therefore omits and describes in detail.That is, the 115A of audio coding section carries out the coding identical with audio coding section 115 and processes.
Replace video data generating unit 211 to generate and replace video data.This replacement video data is the video data that replaces video data VD1.Replace the state of the video data generating unit 105A of 211 pairs of video decode sections to monitor all the time, when the state of the 105A of video decode section changed, generation replaced video data accordingly with the last state of the 105A of video decode section.
For example, process in the situation about stopping in the decoding of the 105A of video decode section, replace video data generating unit 211 to generate the replacement video data that the final video frame (up-to-date frame of video) before stopping to be processed in this decoding of expression.
Replace voice data generating unit 212 to generate and replace voice data.This replacement voice data is the voice data that replaces voice data AD1.Replace the state of the voice data generating unit 107A of 212 pairs of audio decoder sections to monitor all the time, when the state of the 107A of audio decoder section changed, generation replaced voice data accordingly with the last state of the 107A of audio decoder section.
For example, process in the situation about stopping in the decoding of the 107A of audio decoder section, replace voice data generating unit 212 generate voice data instead without sound data.
Numerical data record regenerator 1000A and numerical data record regenerator 1000 are same, have as the common regeneration mode of mode of operation and coding mode again.
In the following description, also the mode of operation of numerical data record regenerator 1000A is called the device mode of operation.
Be in the situation of common regeneration mode in the device mode of operation, usually regenerate and process A.Be again in the situation of coding mode in the device mode of operation, encode again and process A.
Coding is processed among the A again, in numerical data record regenerator 1000A, forms data till 102 to AV multiplexed 117 of the AV separation units and processes path (below, be referred to as to encode again process path A).
(coding is processed the explanation of the AV data path (coding is processed path A again) among the A again)
In addition, in the processing A that encodes again, multiplexed 117 processing of carrying out respectively of AV separation unit 102 and AV is identical with the processing of explanation in the embodiment 1, therefore omits detailed description.Below only sketch.
In the processing A that encodes again, at first, AV separation unit 102 is read the AV bit stream AVST1 that is stored in the storage medium 101.AV separation unit 102 is extracted video bit stream VST1 and audio bitstream AST1 from AV bit stream AVST1.
AV separation unit 102 is stored in video bit stream VST1 in the input video bit stream buffer part 103, and audio bitstream AST1 is stored in the input audio bitstream buffer part 104.
The 105A of video decode section decodes by the video bit stream VST1 to storage in the input video bit stream buffer part 103, obtains video data VD1.In other words, video data VD1 is the 105A of video decode section by the obtained video data of the decoding complete video data of namely decoding.
And, the 105A of video decode section output video data VD1, and this video data VD1 is stored in the video output data buffer part 106.
The 107A of audio decoder section, with the processing of the 105A of video decode section side by side, by the audio bitstream AST1 that is stored in the input audio bitstream buffer part 104 is decoded, obtain voice data AD1.In other words, voice data AD1 is the 107A of audio decoder section by the obtained voice data of the decoding complete voice data of namely decoding.
And, the 107A of audio decoder section outputting audio data AD1, and this voice data AD1 is stored in the audio frequency data output buffer section 108.
In the following description, the timing of the 105A of video decode section output being processed obtained video data VD1 by described decoding is called video output regularly.In addition, in the following description, the timing that the 107A of audio decoder section output is processed obtained voice data AD1 by described decoding is called audio frequency output regularly.
The 113A of Video coding section by to the video data VD1 of storage in the video output data buffer part 106 or up-to-date replacement coding video data, generates video bit stream VST2 according to the aftermentioned control of the AV synchro control 120A of section.That is, the 113A of Video coding section carries out the processing of encoding again to by the video data VD1 that obtains of decoding, perhaps, and to the processing of up-to-date replacement coding video data.
And the 113A of Video coding section is stored in video bit stream VST2 in the coded video bit stream buffer part 114.
The 115A of audio coding section by the voice data AD1 of storage in the audio frequency data output buffer section 108 or up-to-date replacement voice data are encoded, becomes audio bitstream AST2 according to the aftermentioned control of the AV synchro control 120A of section next life.That is, the 115A of audio coding section carries out processing that the voice data AD1 that is carried out first encoding is encoded again, the processing of perhaps up-to-date replacement voice data being encoded.
And the 115A of audio coding section stores audio bitstream AST2 in the coded audio bit stream buffer part 116 into.
Multiplexed 117 of AV undertaken multiplexed by the audio bitstream AST2 to storage in the video bit stream VST2 of storage in the coded video bit stream buffer part 114 and the coded audio bit stream buffer part 116, generate AV bit stream AVST2.Multiplexed 117 of AV is such as carrying out multiplexed according to forms such as MPEG-2.And multiplexed 117 of AV is stored in AV bit stream AVST2 in the storage medium 101.
Process A by above again coding, the video data VD1 and the voice data AD1 that comprise among the AV bit stream AVST1 are encoded again.
(explanation that AV is synchronous)
Process among the A at again coding described above, illustrated that the AV that utilizes synchronizing information (PTS) to carry out is synchronous.
Video synchronizing information extraction unit 118 and audio synchronization information extraction unit 119 processing separately are identical with the processing of explanation in the embodiment 1, therefore omit and repeat.Below only sketch.
Among the video bit stream VST1 that video synchronizing information extraction unit 118 is stored, extract the VPTS as video synchronizing information from video bit stream buffer part 103, and this VPTS is sent to the AV synchro control 120A of section.
In addition, among the audio bitstream AST1 of audio synchronization information extraction unit 119 storage from input audio bitstream buffer part 104, extract the APTS as audio synchronization information, and this APTS is sent to the AV synchro control 120A of section.
The AV synchro control 120A of section carries out the control for video data and voice data are processed synchronously.Specifically, the 120A of AV synchro control section is to the VPTS(video synchronizing information) and the APTS(audio synchronization information) compare.And the AV synchro control 120A of the section control Video coding 113A of section and the 115A of audio coding section are so that the timing that the timing that the 113A of Video coding section encodes and the 115A of audio coding section encode becomes synchronously.
More specifically, the AV synchro control 120A of section, control the 113A of Video coding section according to this comparative result, so that the 113A of Video coding section is to some coding the in decode complete video data and the replacement video data, and control the 115A of audio coding section according to this comparative result, so that audio coding section is to some coding the in decode complete voice data and the described replacement voice data.
That is, VPTS(video synchronizing information) and the APTS(audio synchronization information) be respectively the information for the control Video coding 113A of section and the 115A of audio coding section.The VPTS(video synchronizing information) and the APTS(audio synchronization information) represent respectively when the AV synchro control 120A of section controls the value utilized.
The AV synchro control 120A of section in the situation that the value shown in the VPTS that receives and the value shown in the APTS that receives differ greatly, sends control command to the 113A of Video coding section or the 115A of audio coding section.
Specifically, the AV synchro control 120A of section compares the value of the value of the VPTS that receives and the APTS that receives, more than the synchronization threshold of absolute value for regulation of the difference of the value of the value of this VPTS and this APTS, and, the value of VPTS sends the Video coding control command than in the little situation of the value of APTS to the 113A of Video coding section.
At this, synchronization threshold is for judging that whether video data VD1 and voice data AD1 are in the value of being processed synchronously.The absolute value of the difference of the value of this VPTS and the value of this APTS is the above situation of synchronization threshold, it is the situation that video data VD1 and voice data AD1 are not processed synchronously, in other words, be that described video output is regularly exported situation about regularly departing from mutually with described audio frequency.
This Video coding control command is be used to making the 113A of Video coding section to the order by the up-to-date replacement coding video data that replaces video data generating unit 211 to generate.
In addition, the AV synchro control 120A of section compares the value of the value of the VPTS that receives and the APTS that receives, more than the synchronization threshold of absolute value for regulation of the difference of the value of the value of this VPTS and this APTS, and, the value of APTS sends the audio coding control command than in the little situation of the value of VPTS to the 115A of audio coding section.The audio coding control command is be used to the order that makes the 115A of audio coding section to being encoded by the up-to-date replacement voice data that replaces voice data generating unit 212 to generate.
In the following description, with the absolute value of the difference of the value of the value of VPTS and this APTS, be also referred to as and judge and use absolute value.
Namely, the AV synchro control 120A of section, judge with absolute value as synchronization threshold more than, and, the VPTS(video synchronizing information) value shown in is than APTS(audio synchronization information) shown in the little situation of value under, the control Video coding 113A of section is so that the described Video coding 113A of section is to replacing coding video data.
In addition, the AV synchro control 120A of section, judge with absolute value as synchronization threshold more than, and, the APTS(audio synchronization information) value shown in is than VPTS(video synchronizing information) shown in the little situation of value under, the control audio coding 115A of section is so that the described audio coding 115A of section is to replacing voice data to encode.
Namely, the AV synchro control 120A of section, from the VPTS(video synchronizing information) shown in value and APTS(audio synchronization information) shown in the value that obtains of value satisfy in the situation of rated condition, carry out the some of following processing, namely, make the 113A of Video coding section to replacing the processing of coding video data by the control Video coding 113A of section, perhaps, the 115A of section makes the processing of audio coding control part 115A to replacing voice data to encode by the control audio coding.In the case, rated condition refers to, the VPTS(video synchronizing information) shown in value and APTS(audio synchronization information) shown in the absolute value of difference of value be the above condition of the synchronization threshold of regulation.
In addition, the condition of the 120A of AV synchro control section transmission Video coding control command or audio coding control command is not limited to described condition (utilizing the condition of judging with absolute value).For example, the AV synchro control 120A of section can also calculate the ratio of the value of the value of this VPTS and this APTS, and sends Video coding control command or audio coding control command according to this ratio.
The 113A of Video coding section in the situation that has received the Video coding control command, by to by the up-to-date replacement coding video data that replaces video data generating unit 211 to generate, generates video bit stream VST2.
In addition, the 113A of Video coding section in the situation that does not receive the Video coding control command, encodes by the video data VD1 to storage in the video output data buffer part 106, generates video bit stream VST2.
That is, the 113A of Video coding section, in the situation that has received the Video coding control command, the video data that will become coded object switches to the replacement video data from video data VD1.
The 115A of audio coding section in the situation that has received the audio coding control command, by to being encoded by the up-to-date replacement voice data that replaces voice data generating unit 212 to generate, becomes audio bitstream AST2 next life.
In addition, the 115A of audio coding section in the situation that does not receive the audio coding control command, encodes by the voice data AD1 to storage in the audio frequency data output buffer section 108, becomes audio bitstream AST2 next life.
That is, the 115A of audio coding section, in the situation that has received the audio coding control command, the voice data that will become coded object switches to the replacement voice data from voice data AD1.
At this, describe with object lesson.For example, stopping because existing the damaged decoding that causes the 105A of video decode section to process among the video bit stream VST1 has appearred in imagination, and video synchronizing information extraction unit 118 can not obtain the state as the VPTS of video synchronizing information.
In addition, imagination audio bitstream AST1 is normal stream.That is, the imagination audio decoder 107A of section has normally received audio bitstream AST1.In addition, imagination audio synchronization information extraction unit 119 is extracted the APTS as audio synchronization information from audio bitstream AST1, and this APTS is sent to the AV synchro control 120A of section.
In the case, the value of VPTS does not change, and only has the value of APTS to increase, and the absolute value of the difference of the value of VPTS and the value of APTS becomes more than the synchronization threshold of regulation.That is, the value of VPTS is less than the value of APTS, and the value of APTS with respect to the value of VPTS large departing from has occured.In the case, the 120A of AV synchro control section sends the Video coding control command to the 113A of Video coding section.The Video coding control command for example is for the control command of replenishing coded data.
The 113A of Video coding section in the situation that receives this Video coding control command, obtains by the up-to-date replacement video data that replaces video data generating unit 211 to generate, and this is replaced coding video data.That is, in the case since the 113A of Video coding section not the video data VD1 of storage in the video output data buffer part 106 as coded object, therefore from video output data buffer part 106, do not read video data VD1.
In the case, replacing video data for example is the final decoded data that the time point that stops to be processed in the decoding of the 105A of video decode section.In addition, replacing video data for example is the data that the final video frame (up-to-date frame of video) before stopping to be processed in decoding.
In addition, for example, stopping because existing the damaged decoding that causes the 107A of audio decoder section to process among the audio bitstream AST1 has appearred in imagination, and audio synchronization information extraction unit 119 can not obtain the state as the APTS of audio synchronization information.
In addition, imagination video bit stream VST1 is normal stream.That is, the imagination video decode 105A of section has normally received video bit stream VST1.In addition, video synchronizing information extraction unit 118 is extracted the VPTS as video synchronizing information from video bit stream VST1, and this VPTS is sent to the AV synchro control 120A of section.
In the case, the value of APTS does not change, and only has the value of VPTS to increase, and the absolute value of the difference of the value of VPTS and the value of APTS becomes more than the synchronization threshold of regulation.That is, the value of APTS is less than the value of VPTS, and the value of VPTS large departing from occur with respect to the value of APTS.In the case, the audio coding control command occurs to the 115A of audio coding section in the 120A of AV synchro control section.The audio coding control command for example is for the control command that coded data is replenished.
The 115A of audio coding section in the situation that has received this audio coding control command, obtains by the up-to-date replacement voice data that replaces voice data generating unit 212 to generate, and this replacement voice data is encoded.That is, in the case since the 115A of audio coding section not the voice data AD1 of storage in the audio frequency data output buffer section 108 as coded object, therefore from audio frequency data output buffer section 108, do not read voice data AD1.Replacing voice data for example is without sound data (0 data).
(can realize fast the again explanation of the structure of coding processing A)
In the structure of the numerical data record regenerator 1000A of described Fig. 2, in order to encode again fast, must to carry out fast data at the each several part that consists of again coding and process path A and process.This each several part refers to AV separation unit 102, the 105A of video decode section, the 107A of audio decoder section, the 113A of Video coding section, the 115A of audio coding section, multiplexed 117 of AV.
In addition, in described each one, about multiplexed 117 of AV separation unit 102 and AV, because coding is processed and decoding is processed and compared, process and need not complicated calculation, therefore can get rid of outside system's link.
About the 105A of video decode section and the frequency coding 113A of section, process owing to need to carry out complicated calculation to video data, therefore can consist of video decode section 105 and Video coding section 113 by arithmetic processor, quick arithmetic unit or computing special circuit.
In addition, about the 107A of audio decoder section and the 115A of audio coding section, process owing to need to carry out complicated calculation to voice data, therefore can consist of the 107A of audio decoder section and the 115A of audio coding section by arithmetic processor, quick arithmetic unit or computing special circuit
As mentioned above, process among the A at the again coding of present embodiment, utilize VPTS and APTS to control, so that video data VD1 and voice data AD1 are processed synchronously.That is, process among the A at the again coding of present embodiment, different from the again coding processing of embodiment 1, do not rely on clock and process.That is, the 105A of video decode section, the 107A of audio decoder section, the 113A of Video coding section and the 115A of audio coding section can move respectively asynchronously.
Therefore, according to the numerical data record regenerator 1000A of present embodiment, can realize bringing into play to greatest extent the 105A of video decode section, the 113A of Video coding section, the 107A of audio decoder section, the 115A of audio coding section computing circuit (arithmetic processor) separately performance fast again coding process A.
In addition, the 120A of AV synchro control section can change the 105A of video decode section, the 113A of Video coding section, the 107A of audio decoder section and the 115A of audio coding section processing speed separately according to the kind of device mode of operation.
In the following description, with the related section of encoding again that is called of the 105A of video decode section, the 113A of Video coding section, the 107A of audio decoder section and the 115A of audio coding section.
Specifically, the AV synchro control 120A of section for example controls each related section of encoding again, so that in the processing speed of device mode of operation for each the related section of encoding again in the situation of coding mode again, become than the fast speed of processing speed that in the device mode of operation is each the related section of encoding again in the situation of common regeneration mode.
Thus, can make in the device mode of operation and process the speed of A for the again coding in the situation of coding mode again, become than in the device mode of operation being the fireballing speed that A is processed in common regeneration in the situation of common regeneration mode.That is, can change the speed that convection current is encoded again.
In addition, described embodiment is be used to implementing an example of the present invention, only otherwise exceed purport of the present invention, can carry out all changes.For example, about storage medium, when recording the bit stream after encoding again, can also use other storage medium different from the storage medium that has recorded the AV bit stream before encoding again.As an example, can encode again to the AV bit stream of storing among the HDD, then will be recorded in the Blu-ray dish by this AV bit stream that obtains of encoding again.
In addition, at this situation of being carried out the AV synchronizing information by video synchronizing information extraction unit and audio synchronization information extraction unit has been described, also can have adopted in addition the structure of being extracted the AV synchronizing information by the AV separation unit.
In addition, the AV bit stream AVST1 that becomes again coded object can be stored in the storage medium 101, for example can receive the AV bit stream AVST1 that becomes again coded object by broadcast wave.In addition, the AV bit stream AVST1 that becomes again coded object for example can be the stream that is distributed by the internet.
(FBD (function block diagram))
Fig. 3 is the block scheme of characteristic first functional structure of representative digit data recording/reproducing device 2000.Numerical data record regenerator 2000 is equivalent to the numerical data record regenerator 1000 of Fig. 1.That is, Fig. 3 is the block scheme of the major function related to the present invention in the function that possesses of representative digit data recording/reproducing device 1000.
2000 pairs of the first video bit streams of numerical data record regenerator and the first audio bitstream are processed by a multiplexed AV bit stream, this first video bit stream is that video data is encoded and the bit stream that generates, and this first audio bitstream is that voice data is encoded and the bit stream that generates.
The first video bit stream is equivalent to video bit stream VST1.The first audio bitstream is equivalent to audio bitstream AST1.The one AV bit stream is equivalent to AV bit stream AVST1.
Numerical data record regenerator 2000 has two kinds of mode of operations at least.Two kinds of mode of operations are respectively described again coding mode and common regeneration mode.
The first video bit stream comprises video synchronizing information.Video synchronizing information is equivalent to VPTS.The first audio bitstream comprises audio synchronization information.Audio synchronization information is equivalent to APTS.Video synchronizing information and audio synchronization information are respectively the information of processing synchronously for to video data and voice data.
Numerical data record regenerator 2000 possesses AV separation unit 2102, video synchronizing information extraction unit 2118, audio synchronization information extraction unit 2119, video decode section 2105, audio decoder section 2107, clock generating unit 2121 and AV synchro control section 2120 in function aspects.
AV separation unit 2102 is extracted the first video bit stream and the first audio bitstream from an AV bit stream.Video synchronizing information extraction unit 2118 is extracted described video synchronizing information from described the first video bit stream.Audio synchronization information extraction unit 2119 is extracted described audio synchronization information from described the first audio bitstream.
Video decode section 2105 is for by described the first video bit stream is decoded to obtain described video data, and exports the textural element of this video data.Audio decoder section 2107 is for by described the first audio bitstream is decoded to obtain described voice data, and exports the textural element of this voice data.
Clock generating unit 2121 generates the AV that is used for described video data and described voice data are processed synchronously and uses synchronously clock.AV is equivalent to AV with clock synchronously and uses synchronously clock AVCK.
AV synchro control section 2120 carries out the control for described video data and described voice data are processed synchronously.
AV separation unit 2102, video synchronizing information extraction unit 2118, audio synchronization information extraction unit 2119, video decode section 2105, audio decoder section 2107, clock generating unit 2121 and AV synchro control section 2120 are equivalent to respectively AV separation unit 102, video synchronizing information extraction unit 118, audio synchronization information extraction unit 119, video decode section 105, audio decoder section 107, clock generating unit 121 and AV synchro control section 120.
Specifically, AV synchro control section 2120 utilizes described video synchronizing information, described audio synchronization information and described AV to use synchronously clock, control described video decode section 2105 and described audio decoder section 2107 so that the output of the described video data of described video decode section's 2105 outputs regularly and described audio decoder section 2107 output of exporting described voice data regularly become synchronously.
Numerical data record regenerator 2000 is in function aspects, also possesses multiplexed 2117 of video efferent 2109, audio output part 2111, Video coding section 2113, audio coding section 2115 and AV.
Video efferent 2109 is exported described video data according to using clock with the video output of clock synchronous synchronously with described AV.Video output is equivalent to video clock VCK with clock.
Audio output part 2111 is exported described voice data according to using clock with the audio frequency output of clock synchronous synchronously with described AV.Audio frequency output is equivalent to audio frequency clock ACK with clock.
Video coding section 2113 is by decoding to generate the second video bit stream to the described video data of being exported by described video efferent 2109.The second video bit stream is equivalent to video bit stream VST2.
Audio coding section 2115 is by encoding to generate the second audio bitstream to the described voice data of being exported by described audio output part 2111.The second audio bitstream is equivalent to audio bitstream AST2.
Multiplexed 2117 of AV is by carrying out multiplexed the 2nd AV bit stream that generates to described the second video bit stream and described the second audio bitstream.The 2nd AV bit stream is equivalent to AV bit stream AVST2.
In addition, clock generating unit 2121 also according to the kind of the mode of operation of described numerical data record regenerator 2000, changes the speed that described AV uses clock synchronously.
Large scale integrated circuit) etc. in addition, the whole or part of multiplexed 2117 of AV separation unit 2102, video synchronizing information extraction unit 2118, audio synchronization information extraction unit 2119, video decode section 2105, audio decoder section 2107, clock generating unit 2121, AV synchro control section 2120, video efferent 2109, audio output part 2111, Video coding section 2113, audio coding section 2115 and AV can be by LSI(Large Scale Integration: hardware consists of.
Fig. 4 is the block scheme of characteristic second functional structure of representative digit data recording/reproducing device 3000.Numerical data record regenerator 3000 is equivalent to the numerical data record regenerator 1000A of Fig. 2.That is, Fig. 4 is the block scheme of the major function related to the present invention in the function that has of representative digit data recording/reproducing device 1000A.
3000 pairs of the first video bit streams of numerical data record regenerator and the first audio bitstream are processed by a multiplexed AV bit stream, this first video bit stream is that video data is encoded and the bit stream that generates, and described the first audio bitstream is that voice data is encoded and the bit stream that generates.
The first video bit stream is equivalent to video bit stream VST1.The first audio bitstream is equivalent to audio bitstream AST1.The one AV bit stream is equivalent to AV bit stream AVST1.
Described the first video bit stream comprises video synchronizing information.Video synchronizing information is equivalent to VPTS.Described the first audio bitstream comprises audio synchronization information.Audio synchronization information is equivalent to APTS.
Numerical data record regenerator 3000 is in function aspects, possesses AV separation unit 3102, video synchronizing information extraction unit 3118, audio synchronization information extraction unit 3119, the 3105A of video decode section, the 3107A of audio decoder section, the AV synchro control 3120A of section, replaces video data generating unit 3211, replaces voice data generating unit 3212, multiplexed 3117 of the 3113A of Video coding section, the 3115A of audio coding section and AV.
AV separation unit 3102 is extracted described the first video bit stream and described the first audio bitstream from a described AV bit stream.Video synchronizing information extraction unit 3118 is extracted described video synchronizing information from described the first video bit stream.Audio synchronization information extraction unit 3119 is extracted described audio synchronization information from described the first audio bitstream.
The 3105A of video decode section is for by described the first video bit stream is decoded to obtain described video data, and exports the textural element of this video data.The 3107A of audio decoder section is for by described the first audio bitstream is decoded to obtain described voice data, and exports the textural element of this voice data.The AV synchro control 3120A of section carries out the control for described video data and described voice data are processed synchronously.
Replace video data generating unit 3211 to generate and replace video datas, this replacements video data replacement by the described video decode 3105A of section by the obtained video data of the decoding complete video data of namely decoding.Replace voice data generating unit 3212 to generate and replace video datas, this replacements video data replacement by the described audio decoder 3107A of section by the obtained voice data of the decoding complete voice data of namely decoding.
The 3113A of Video coding section is by generating the second video bit stream to the complete video data of described decoding or described replacement coding video data.The second video bit stream is equivalent to video bit stream VST2.
The 3115A of audio coding section is by encoding to generate the second audio bitstream to the complete voice data of described decoding or described replacement voice data.The second audio bitstream is equivalent to audio bitstream AST2.
Multiplexed 3117 of AV is by carrying out multiplexed the 2nd AV bit stream that generates to described the second video bit stream and described the second audio bitstream.The 2nd AV bit stream is equivalent to AV bit stream AVST2.
Described video synchronizing information and described audio synchronization information are respectively be used to the information of controlling the described Video coding 3113A of section and the described audio coding 3115A of section.
Specifically, the AV synchro control 3120A of section compares described video synchronizing information and described audio synchronization information, (a) control the described Video coding 3113A of section according to this comparative result, so that the described Video coding 3113A of section is to some coding the in the complete video data of described decoding and the described replacement video data, and, (b) come the described audio coding 3115A of section is controlled according to this comparative result, so that the described audio coding 3115A of section is to some coding the in the complete voice data of described decoding and the described replacement voice data, thereby the timing that timing that the described Video coding 3113A of section encodes and the described audio coding 3115A of section are encoded becomes synchronously.
AV separation unit 3102, video synchronizing information extraction unit 3118, audio synchronization information extraction unit 3119, the 3105A of video decode section, the 3107A of audio decoder section and the AV synchro control 3120A of section are equivalent to respectively AV separation unit 102, video synchronizing information extraction unit 118, audio synchronization information extraction unit 119, the 105A of video decode section, the 107A of audio decoder section and the AV synchro control 120A of section.
In addition, replace video data generating unit 3211, replace voice data generating unit 3212, the 3113A of Video coding section, the 3115A of audio coding section and multiplexed 3117 of AV to be equivalent to respectively replace video data generating unit 211, replace voice data generating unit 212, multiplexed 117 of the 113A of Video coding section, the 115A of audio coding section and AV.
In addition, AV separation unit 3102, video synchronizing information extraction unit 3118, audio synchronization information extraction unit 3119, the 3105A of video decode section, the 3107A of audio decoder section, the AV synchro control 3120A of section, replace video data generating unit 3211, replace voice data generating unit 3212, large scale integrated circuit) the whole or part of multiplexed 3117 of the 3113A of Video coding section, the 3115A of audio coding section and AV can be by LSI(Large Scale Integration: the hardware formation such as.
More than, about numerical data record regenerator 1000 of the present invention and numerical data record regenerator 1000A, be illustrated according to embodiment, but the present invention is not limited to these embodiments.Only otherwise exceed purport of the present invention, those skilled in the art are implemented on present embodiment with its various deformation forms of imagining and the form that obtains, the form that perhaps textural element of different embodiments is made up and form also is within the scope of the present invention.
In addition, a whole or part that consists of a plurality of textural elements of described numerical data record regenerator 1000 and numerical data record regenerator 1000A can be made of hardware.In addition, central processing unit) etc. consisting of textural element whole or a part of of described numerical data record regenerator 1000 and numerical data record regenerator 1000A, also can be by CPU(Central Processing Unit: the program module of carrying out.
In addition, consisting of the whole or part of a plurality of textural elements of described numerical data record regenerator 1000 and numerical data record regenerator 1000A can be by a system LSI (Large Scale Integration: large scale integrated circuit) consist of.Random access memory) etc. ROM (read-only memory)) and RAM(Random Access Memory system LSI is to carry out integrated and super multi-functional LSI that manufacture to a plurality of textural elements on a chip, specifically comprises microprocessor, ROM(Read Only Memory:: the computer system that consists of.
For example, the AV separation unit 102 among Fig. 1, input video bit stream buffer part 103, input audio bitstream buffer part 104, video decode section 105, video output data buffer part 106, audio decoder section 107, audio frequency data output buffer section 108, video efferent 109, Video coding input block section 110, audio output part 111, audio coding input block section 112, Video coding section 113, coded video bit stream buffer part 114, audio coding section 115, coded audio bit stream buffer part 116 and multiplexed 117 of AV can be made of a system LSI.
In addition, can also realize the present invention as the digital data recording method of step by the action of the characteristic component part that had with numerical data record regenerator 1000 or numerical data record regenerator 1000A.In addition, can also realize the present invention by the program that makes computing machine carry out each step that comprises in the described digital data recording method.The storage medium of embodied on computer readable that in addition, also can be by storing said program is realized the present invention.In addition, can transmit this program by transmission mediums such as internets.
More than its all the elements of disclosed embodiment all represent an example, and should not be construed as the present invention and be defined in this.Scope of the present invention is not according to above explanation, and is as the criterion with the claim scope, means that namely all changes that are equal in meaning and the scope thereof with the claim scope all belong to the present invention.
The present invention can be when keeping AV synchronous, according to processings of encoding again fast of the processing power of AV lsb decoder and AV lsb decoder, so can be applied to improve the numerical data record regenerator of user's ease of use.
Symbol description
101 storage mediums
102,2102,3102 AV separation units
103 input video bit stream buffer part
104 input audio bitstream buffer part
105,105A, 2105,3105A video decode section
106 video output data buffer part
107,107A, 2107,3107A audio decoder section
108 audio frequency data output buffer sections
109,2109 video efferents
110 Video codings input buffer part
111,2111 audio output part
112 audio codings input buffer part
113,113A, 2113,3113A Video coding section
114 coded video bit stream buffer part
115,115A, 2115,3115A audio coding section
116 coded audio bit stream buffer part
117, the multiplexed section of 2117,3117 AV
118,2118,3118 video synchronizing information extraction units
119,2119,3119 audio synchronization information extraction units
120,120A, 2120,3120A AV synchro control section
121,2121 clock generating units
211,3211 replace the video data generating unit
212,3212 replace the voice data generating unit
1000,1000A, 2000,3000 numerical data record regenerators

Claims (6)

1. numerical data record regenerator, the first video bit stream and the first audio bitstream are processed by the first multiplexed audiovisual bit stream, this first video bit stream is that video data is encoded and the bit stream that generates, this first audio bitstream is that voice data is encoded and the bit stream that generates
Described numerical data record regenerator has two kinds of mode of operations at least,
Described the first video bit stream comprises video synchronizing information,
Described the first audio bitstream comprises audio synchronization information,
Described video synchronizing information and described audio synchronization information are respectively the information of processing synchronously for to described video data and described voice data,
Described numerical data record regenerator possesses:
The audiovisual separation unit is extracted described the first video bit stream and described the first audio bitstream from described the first audiovisual bit stream;
The video synchronizing information extraction unit is extracted described video synchronizing information from described the first video bit stream;
The audio synchronization information extraction unit is extracted described audio synchronization information from described the first audio bitstream;
Video decode section by described the first video bit stream is decoded to obtain described video data, and exports this video data;
Audio decoder section by described the first audio bitstream is decoded to obtain described voice data, and exports this voice data;
The clock generating unit generate to be used for clock is used in the audiovisual that described video data and described voice data are processed synchronously synchronously; And
Audiovisual synchro control section carries out be used to the control that described video data and described voice data are processed synchronously,
Described audiovisual synchro control section utilizes described video synchronizing information, described audio synchronization information and described audiovisual to use synchronously clock, control described video decode section and described audio decoder section, so that the output that described video decode section exports described video data regularly and the output of exporting described voice data of described audio decoder section regularly become synchronously
Described numerical data record regenerator also possesses:
The video efferent using clock with the video output of clock synchronous synchronously with described audiovisual, is exported described video data accordingly;
Audio output part using clock with the audio frequency output of clock synchronous synchronously with described audiovisual, is exported described voice data accordingly;
Video coding section by to the described coding video data by described video efferent output, generates the second video bit stream;
Audio coding section by to being encoded by the described voice data of described audio output part output, generates the second audio bitstream; And
The multiplexed section of audiovisual, multiplexed by described the second video bit stream and described the second audio bitstream are carried out, generate the second audiovisual bit stream,
Described clock generating unit, further, the kind according to the mode of operation of described numerical data record regenerator changes the speed that clock is used in described audiovisual synchronously.
2. numerical data record regenerator as claimed in claim 1,
Described numerical data record regenerator, possess first mode and the second pattern as mode of operation, this first mode is used for regenerating described the first audiovisual bit stream, and this second pattern is used for described the first audiovisual bit stream is decoded, and the data that obtain by this decoding are encoded
Described clock generating unit, so that be the speed that clock is used in the described audiovisual that generates in the situation of described the second pattern synchronously in the mode of operation of described numerical data record regenerator, becoming than the mode of operation at described numerical data record regenerator is the fireballing speed that clock is used in the described audiovisual that generates in the situation of described first mode synchronously.
3. such as claim 1 or 2 described numerical data record regenerators,
Described video synchronizing information, described audio synchronization information and described audiovisual represent respectively the value that described audiovisual synchro control section utilizes with clock synchronously when controlling,
Described audiovisual increases along with the process of time with the value shown in the clock synchronously,
Described audiovisual synchro control section, (a) the described video decode of control section, so that described video decode section uses the described video data of the consistent timing output of the value shown in the clock synchronously in the value shown in the described video synchronizing information and described audiovisual, (b) the described audio decoder of control section is so that described audio decoder section uses the described voice data of the consistent timing output of the value shown in the clock synchronously in the value shown in the described audio synchronization information and described audiovisual.
4. numerical data record regenerator, the first video bit stream and the first audio bitstream are processed by the first multiplexed audiovisual bit stream, this first video bit stream is that video data is encoded and the bit stream that generates, this first audio bitstream is that voice data is encoded and the bit stream that generates
Described the first video bit stream comprises video synchronizing information,
Described the first audio bitstream comprises audio synchronization information,
Described numerical data record regenerator possesses:
The audiovisual separation unit is extracted described the first video bit stream and described the first audio bitstream from described the first audiovisual bit stream;
The video synchronizing information extraction unit is extracted described video synchronizing information from described the first video bit stream;
The audio synchronization information extraction unit is extracted described audio synchronization information from described the first audio bitstream;
Video decode section by described the first video bit stream is decoded to obtain described video data, and exports this video data;
Audio decoder section by described the first audio bitstream is decoded to obtain described voice data, and exports this voice data;
Audiovisual synchro control section carries out be used to the control that described video data and described voice data are processed synchronously;
Replace the video data generating unit, generate and replace video data, this replaces video data to replace the complete video data of decoding, and this complete video data of decoding is by the obtained video data of decoding by described video decode section;
Replace the voice data generating unit, generate and replace voice data, this replaces voice data to replace the complete voice data of decoding, and this complete voice data of decoding is the voice data of being obtained by decoding by described audio decoder section;
Video coding section by to the complete video data of described decoding or described replacement coding video data, generates the second video bit stream;
Audio coding section by the complete voice data of described decoding or described replacement voice data are encoded, generates the second audio bitstream; And
The multiplexed section of audiovisual, multiplexed by described the second video bit stream and described the second audio bitstream are carried out, generate the second audiovisual bit stream,
Described video synchronizing information and described audio synchronization information are respectively the information of controlling for to described Video coding section and described audio coding section,
Described audiovisual synchro control section, described video synchronizing information and described audio synchronization information are compared, (a) control described Video coding section according to this comparative result, so that described Video coding section encodes to the complete video data of described decoding and the some of described replacement video data, and (b) control described audio coding section according to this comparative result, so that described audio coding section encodes to the complete voice data of described decoding and the some of described replacement voice data, thus the timing that described Video coding section is encoded, the timing of encoding with described audio coding section becomes synchronously.
5. numerical data record regenerator as claimed in claim 4,
Described video synchronizing information and described audio synchronization information represent respectively the value utilized when described audiovisual synchro control section controls,
Described audiovisual synchro control section, satisfy in the situation of rated condition in the value that obtains according to the value shown in the value shown in the described video synchronizing information and the described audio synchronization information, carry out some in the following processing, (c) the described Video coding of control section, so that described Video coding section is to the processing of described replacement coding video data, and (d) the described audio coding of control section is so that the processing that described audio coding section encodes to described replacement voice data.
6. numerical data record regenerator as claimed in claim 5,
Described rated condition refers to that the absolute value of the difference of the value shown in the value shown in the described video synchronizing information and the described audio synchronization information is the above condition of the synchronization threshold of regulation,
Described audiovisual synchro control section,
(e) described absolute value be more than the described synchronization threshold and the value shown in the described video synchronizing information than the little situation of the value shown in the described audio synchronization information under, control described Video coding section, so that described Video coding section is to described replacement coding video data
(f) described absolute value be more than the described synchronization threshold and the value shown in the described audio synchronization information than the little situation of the value shown in the described video synchronizing information under, control described audio coding section, so that described audio coding section encodes to described replacement voice data.
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WO2011158474A1 (en) 2011-12-22
JP5700853B2 (en) 2015-04-15

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