CN1977538A - Adaptive fallback system for MPEG decoders in consumption goods - Google Patents
Adaptive fallback system for MPEG decoders in consumption goods Download PDFInfo
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- CN1977538A CN1977538A CN200580006603.1A CN200580006603A CN1977538A CN 1977538 A CN1977538 A CN 1977538A CN 200580006603 A CN200580006603 A CN 200580006603A CN 1977538 A CN1977538 A CN 1977538A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/136—Incoming video signal characteristics or properties
- H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
- H04N19/139—Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/156—Availability of hardware or computational resources, e.g. encoding based on power-saving criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/162—User input
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/172—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a picture, frame or field
Abstract
Methods and apparatus in an adaptive fallback architecture provide for the preparsing of an MPEG encoded video stream to enable the determination of when an MPEG decoder may be switched into, or out of, modes of operation in order to reduce, for example, the computational, memory storage, and/or the memory bandwidth requirements of MPEG decoding. A pre-parser evaluates at least one of the amount, type, and length of motion vectors in an MPEG stream, prior to decoding of that portion of the MPEG stream, and generates at least one control signal for communication to an MPEG decoder which, responsive to the at least one control signal switches to a decoding mode that provides a peak memory bandwidth requirement below a predetermined threshold value.
Description
Present invention relates in general to decoding, more specifically relate to and be used to be reduced by at least the calculating of part MPEG decoding task and the method and apparatus of storage demand the inlet flow of mpeg encoded.
The development of semiconductor technology and digital system architecture causes computing capability to increase significantly, causes the cost of described computing capability to reduce simultaneously.Low-cost and high-performance computational resource and then can realize kind consumption electronic product widely again.
In popular consumption electronic product, existence can the common simultaneously also consumption electronic product of plays back audio of display video data.The video data of record receives the video data that will be shown to described consumption electronic product by means of for example wireless transmission or by retrieving in advance.About video data, the different industry standard specifications that are used for video data compression and decompression have been developed.Sometimes also this compression and decompression of video data are called coding and decoding.By the data that are used to store and/or send are compressed, can reduce the quantity of the original required storage and the capacity of transmission.It is MPEG that the most frequently used audio/video compression is conciliate one of compression standard series.
MPEG compression or coding are carried out a plurality of conversion to incoming video signal so that represent this vision signal with more a spot of data (promptly than original vision signal required amount data still less of digitlization simply).Mpeg encoded utilizes following benefit, and promptly the data variation from the frame to the frame is lacked than all data volumes variations of this frame usually.The various variations of interframe can be encoded to motion vector, this vector is applied to a foundation drawing picture frame.MPEG decoding has then been put upside down cataloged procedure basically so that reproduce original video input.
Required calculating, memory stores and the bandwidth of memory resource of MPEG decoding can be sizable.
Needed is the one or more method and apparatus that is used for reducing required required calculating, memory stores and bandwidth of memory resource of (even temporary transient minimizing) MPEG decoding.
Briefly, retreat in the architecture in self adaptation, can determine through the preanalysis of the video flowing of mpeg encoded when the MPEG decoder can switch to or switch and mode of operation, so that reduce calculating, memory stores and/or the memory bandwidth requirements of for example MPEG decoding.Presort parser and before the part mpeg stream is deciphered, assess in quantity, type and the length of motion vector in the mpeg stream one or more, and produce at least one control signal that is used for communicating with the MPEG decoder, this MPEG decoder responds at least one control signal and switches to a kind of decoding mode, and it provides the bandwidth demand of the peak value memory that is lower than predetermined threshold.
Fig. 1 is the high-level block diagram that comprises demultiplexer, presorts the system of parser and hardware MPEG decoder according to of the present invention.
Fig. 2 is the flow chart that is used to illustrate the method according to this invention.
Fig. 3 is the flow chart that is used to illustrate the method according to this invention.
Present invention relates in general to according to the various parameters in the mpeg video stream, at least during the part of mpeg video stream is deciphered, be used to reduce the method and apparatus of the system loading of MPEG decoding.More specifically, the present invention relates to dynamically adaptive MPEG decode procedure so that decode procedure does not need the MPEG decoder above the method and apparatus such as the such restriction of predetermined peak value bandwidth of memory.
At this quoting of " embodiment ", " embodiment " or similar statement being meant special characteristic, structure, operation or the characteristic described in conjunction with embodiments of the invention comprises at least one embodiment of the present invention.So the so herein phrase or the appearance of expression differ to establish a capital and relate to identical embodiment.And, in one or more embodiments can be various concrete features, structure, operation or property combination together with arbitrary suitable manner.
When mpeg video stream was deciphered, calculating, memory stores and memory bandwidth requirements closely depended on the content of mpeg stream.By checking stream in advance, can before taking place, actual MPEG decoding determine the information of relevant described requirement.So just can use this information dynamically to open/turn off and temporarily to reduce system loading (for example, calculating, memory stores and bandwidth of memory) by " fall back " mode" built-in or that be present in the MPEG decoder.
Can in the MPEG decoder, provide the scheme of retreating or mode of operation so that the shortcut that reduces system loading to be provided.These shortcuts mainly use in software MPEG decoder.Yet described MPEG decoder is not analyzed the video flowing of input in advance and is determined the load of the MPEG encoder/decoder system of appearance soon.
Embodiments of the invention comprise following ability, promptly check mpeg stream in advance, determine whether will activate the scheme of retreating in the MPEG decoder according to the value of one or more system parameterss of mpeg stream then.Under the situation that does not have ability of checking (preanalysis just) in advance provided by the present invention, for some parameters, switch to the decision that retreats mode of operation (for example, the words of control bandwidth) if desired always too late in the MPEG decoder.
When being used, embodiments of the invention are carried out some operations usually, comprise the reception mpeg stream; The preanalysis mpeg stream is so that the research motion vector; Determine the peak memory bandwidth that the MEPG decoder will consume based on quantity, type and the length of motion vector for given image or parts of images at least in part; And if determined peak memory bandwidth surpassed predetermined value, so for given image or parts of images, the MPEG decoder switched to retreat mode of operation.In one embodiment, retreat mode of operation and only use in two predictions of B image one, this has caused reducing the demand of the bandwidth of memory of corresponding image or parts of images.
With reference to figure 1, show the high-level block diagram that comprises demultiplexer, presorts the illustrative apparatus of parser and hardware MPEG decoder according to of the present invention.Demultiplexer 102 is coupled so that receive a transport stream and produce basic stream with as exporting.In this case, transport stream comprises image encoded data.Presort that parser 104 is coupled to demultiplexer 102 so that receive basic stream.It should be understood that related video flowing can be " high definition " mpeg stream herein, or any other video flowing.Presort the content of the basic stream of parser 104 assessment, and be identified for deciphering the profile (profile) of memory bandwidth requirements of the video flowing of this part based on quantity, type and the length of for example motion vector.If memory bandwidth requirements has surpassed predetermined value, presort control signal of parser 104 outputs so, this control signal shows will to use in the process that the video flowing of this specific part is deciphered and retreats mode of operation.This predetermined value is also referred to as boundary or threshold value.The time of parser 104 and the basic stream of output of presorting is gone up the version that postpones.Decoder 106 couplings are received version and the control signal that the basic time of flowing postpones so that be used for from presorting parser 104.Decoder 106 is according to presorting the state that parser 104 offers the control signal of decoder 106, to be suitable for maintaining the pattern work of certain memory bandwidth requirements.In one embodiment, if presort that parser 104 is determined decoded operations otherwise will surpass predetermined memory bandwidth requirements, decoder 106 only uses two of the B image one of to predict so.Decoder 106 also is suitable for output in addition and has deciphered sequence.To the decode procedure such as the such encoded video sequence of MPEG encoded video is known, therefore is not described further the details of described decoding at this.
About above-mentioned predetermined value, in different embodiment, it can be a value that fix or programmable.Generally, described predetermined value relates to the resource limit of MPEG decoder, such as for example peak memory bandwidth.Yet at determining of carrying out whether relevant MPEG decoder should operate with arbitrary specific " fall back " mode", any resource limit will be considered.In predetermined value is among the programmable embodiment, according to user's hobby, video flowing or the arbitrary suitable consideration item or the combination of consideration item of input, this restriction can be set dynamically.Relate in the illustrative embodiment of peak memory bandwidth in predetermined value, can select this value so that the MPEG decoder can not lost any frame.In another optional embodiment, can select this value so that keep a mean value of Loss Rate.In another optional embodiment, can select predetermined value based on arbitrary suitable combination that design is considered or design is considered.The present invention is not limited to arbitrary special scheme when predetermined value is set.In an optional embodiment again, exist and two or morely (for example relate to two or more resource limit, available memory storage capabilities and peak memory bandwidth availability) predetermined value, and presort parser 104 and carry out relevant MPEG decoder with determining that " fall back " mode" is operated based on described two or more restrictions.
With reference to figure 2, it shows the flow chart that is used to illustrate the method according to this invention.Method shown in Figure 2 has reduced the system loading of video decoder, and comprise the video flowing 202 that reception has been encoded, the video flowing 204 that preanalysis has been encoded, to small part based on the preanalysis of encoded video streams be identified for to first image in the encoded video streams first deciphers at least the time system load demand 206, if and determined system load demand surpassed predetermined value, the mode of operation with the video flowing decoder switches to " fall back " mode" 208 so.It should be understood that and to implement preanalysis with the compound mode of hardware, software or hardware and software.
With reference to figure 3, show the flow chart that is used to illustrate the method according to this invention.Method shown in Figure 3 reduces the system loading of MPEG decoder, and comprises: before MPEG encoded video streams is offered the MPEG decoder MPEG encoded video streams offered and presort parser 302; Assessment MPEG is at least one in quantity, type and the length of a plurality of motion vectors 304 in the encoded video streams; Determine that based on the assessment of MPEG encoded video streams peak memory bandwidth 306, described peak memory bandwidth are to be operated in the non-MPEG decoder that moves back pattern work to be used for deciphering required at least the first image section of MPEG encoded video streams to small part; If determined peak memory bandwidth demand has surpassed predetermined value, the mode of operation with the MPEG decoder switches to " fall back " mode" 308 from non-" fall back " mode" so; And MPEG encoded video streams offered MPEG decoder 310.It should be understood that and to come motion vector is assessed with the compound mode of hardware, software or hardware and software.
Various embodiment of the present invention comprises the encoded video streams that is used for this part of assessment before decoding part encoded video streams, and order is assessed based on this, video decoder is switched to second mode of operation from first mode of operation, so that the system load demand that keeps this part encoded video streams is deciphered is lower than predetermined value.
The advantage of some embodiments of the present invention is: by reducing system load demand (such as peak memory bandwidth), make it be lower than predetermined value, thereby can keep the real-time decoding of video flowing.
It should be understood that to the invention is not restricted to the foregoing description, but comprise the some or all of embodiment that the claims scope is interior.
Claims (20)
1. method that is used to reduce the system loading of video decoder comprises:
Receive encoded video streams (202); This encoded video streams (204) of preanalysis; To small part based on to this preanalysis of encoded video streams, be identified for this system load demand (206) that first at least of first image deciphers in encoded video streams; And if determined system load demand surpassed predetermined value, then the mode of operation with the video flowing decoder switches to " fall back " mode" (208).
2. method as claimed in claim 1, wherein preanalysis is included in assessing one or more motion vectors in the decoding video-flow before the video flowing decoding.
3. method as claimed in claim 2 determines that wherein system load demand comprises at least one in quantity, type and the length of the motion vector of assessing preanalysis.
4. method as claimed in claim 3, wherein system load demand comprises memory bandwidth requirements.
5. method as claimed in claim 4, wherein memory bandwidth requirements is the peak memory bandwidth demand.
6. method as claimed in claim 3, wherein encoded video streams is a MPEG encoded video streams; Described decoder is the MPEG decoder; And retreat mode of operation and cause the system load demand that reduces.
7. method as claimed in claim 6, wherein the system load demand of Jian Shaoing is the memory bandwidth demand that reduces.
8. method as claimed in claim 7 wherein retreats mode of operation and only uses a kind of in two kinds of predictions of B image.
9. method as claimed in claim 8, further comprise: followingly determine: when predetermined peak memory bandwidth can not be exceeded by the second portion at least of second image is deciphered, the mode of operation of MPEG decoder is switched to non-" fall back " mode" from " fall back " mode" when making.
10. method as claimed in claim 9, wherein first image is different images with second image.
11. a method that is used to reduce the system loading of MPGE decoder comprises:
MPEG encoded video streams offered presort parser (302); Before MPEG encoded video streams is provided to the MPEG decoder, in quantity, type and the length of a plurality of motion vectors among MPEG encoded video streams at least one assessed (304); To small part based on assessment to MPEG encoded video streams, determine the MPEG decoder of in non-" fall back " mode", working required be used for peak memory bandwidth (306) that at least the first image section of MPEG encoded video streams is deciphered; If determined peak memory bandwidth demand has surpassed predetermined value, then the mode of operation with the MPEG decoder switches to " fall back " mode" (308) from non-" fall back " mode"; And MPEG encoded video streams offered MPEG decoder (310).
12., wherein retreat mode of operation and only use a kind of in two kinds of predictions of B image as the method for claim 11.
13., wherein the mode of operation of MPEG decoder is switched to " fall back " mode" and causes that the peak memory bandwidth demand reduces during decoding first image section as the method for claim 12.
14., further comprise MPEG encoded video streams deciphered as the method for claim 13; And switch to non-" fall back " mode" from " fall back " mode".
15. a device that is used to reduce the system load demand that encoded video streams is deciphered comprises:
Demultiplexer (102) is suitable for receiving first data flow, and produce second data flow with as output; Presort parser (104), be coupled into and receive second data flow, can be used for producing the 3rd data flow as first output; Also be used to produce at least one control signal in addition as second output; And decoder (106), be coupled into and receive the 3rd data flow and at least one control signal of presorting parser, and the version after the decoding of the version that the time that produces second data flow upward postpones, this decoder can be operated in two kinds of work decoding patterns at least, and each mode of operation has different system load demands; Wherein first data flow comprises coded picture data, and the mode of operation of decoder is according at least one control signal and selectable.
16 devices as claim 15, wherein first data flow is a transport stream, and second data flow is basic stream, and the 3rd data flow is the time of basic stream to go up the version that postpones; And wherein presort parser and be used for producing this at least one control signal based at least one predetermined decoder resource limit to small part.
17. as the device of claim 16, wherein said decoder is the MPEG decoder, and wherein a kind of mode of operation of MPEG decoder is only used a kind of so that reduce the required bandwidth of memory of decoding in two kinds of predictions of B image.
18 devices as claim 17, wherein the MPEG decoder is suitable for receiving to few control signal in image-by-image mode from presorting parser.
19. as the device of claim 17, wherein the MPEG decoder can be used for responding at least one control signal and selects multiple one of the mode of operation that retreats.
20., wherein predetermined resource limit is set based on predetermined frame loss rate as the device of claim 19.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2005/050801 WO2006092671A1 (en) | 2005-03-03 | 2005-03-03 | Adaptive fallback system for mpeg decoders |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1977538A true CN1977538A (en) | 2007-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200580006603.1A Pending CN1977538A (en) | 2005-03-03 | 2005-03-03 | Adaptive fallback system for MPEG decoders in consumption goods |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2008532405A (en) |
| CN (1) | CN1977538A (en) |
| WO (1) | WO2006092671A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463525C (en) * | 2006-12-11 | 2009-02-18 | 浙江大学 | Video frequency coding method and device capable of dynamic regulating computational complexity |
| US9462233B2 (en) * | 2009-03-13 | 2016-10-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods of and arrangements for processing an encoded bit stream |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100248404B1 (en) * | 1997-09-04 | 2000-03-15 | 정선종 | Circulating calculated decreasing method |
| JPH11112972A (en) * | 1997-09-30 | 1999-04-23 | Matsushita Electric Ind Co Ltd | Device and method for extracting combined processing amount information |
| JPH11122624A (en) * | 1997-10-16 | 1999-04-30 | Matsushita Electric Ind Co Ltd | Method and system for reducing video decoder processing amount |
| SG116400A1 (en) * | 1997-10-24 | 2005-11-28 | Matsushita Electric Ind Co Ltd | A method for computational graceful degradation inan audiovisual compression system. |
| JPH11146398A (en) * | 1997-11-04 | 1999-05-28 | Matsushita Electric Ind Co Ltd | Multimedia information processing unit |
| US7016412B1 (en) * | 2000-08-29 | 2006-03-21 | Koninklijke Philips Electronics N.V. | System and method for dynamic adaptive decoding of scalable video to balance CPU load |
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2005
- 2005-03-03 JP JP2007557605A patent/JP2008532405A/en active Pending
- 2005-03-03 CN CN200580006603.1A patent/CN1977538A/en active Pending
- 2005-03-03 WO PCT/IB2005/050801 patent/WO2006092671A1/en not_active Application Discontinuation
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| Publication number | Publication date |
|---|---|
| JP2008532405A (en) | 2008-08-14 |
| WO2006092671A1 (en) | 2006-09-08 |
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