CN103327316A - Video macroblock context information access method and system - Google Patents
Video macroblock context information access method and system Download PDFInfo
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Abstract
The invention provides a video macroblock context information access method and system. The method includes the steps that when a coder decoder codes or decodes a current macroblock, the coder decoder reads context information of an adjacent macroblock stored in a macroblock context memorizer and context information of a sub-macroblock in the current macroblock stored in a sub-macroblock context memorizer; the coder decoder codes or decodes the current macroblock according to the context information of the adjacent macroblock and the context information of the sub-macroblock; during coding and decoding of the current macroblock, the context information of the sub-macroblcok is updated and stored in the sub-macroblock context memorizer; after coding and decoding of the current macroblock, the context information of the current macroblock is extracted and stored in the macroblock context memorizer.
Description
Technical field
The present invention relates to a kind of contextual information access method and system of video macro block, especially, relate to a kind of based on contextual information access method and system towards the video macro block of the video macro block context mechanism of entropy encoding/decoding design.
Background technology
In existing video encoding and decoding standard, codec based on entropy encoding/decoding generally all can use the prediction encoding and decoding in a large number, namely utilize the contextual information of sub-macro block of the contextual information of adjacent macroblocks and interior macroblocks as the predicted value of encoding and decoding, and along with these contextual informations of constantly updating of encoding and decoding.The use of these contextual informations has improved encoding-decoding efficiency, also increased simultaneously the complexity of codec design, such as for the video standard that H.264 waits some main flows, the least unit that contextual information is corresponding reaches the rank of the sub-macro block of 4x4, that is to say, the least unit of the contextual information that relates in the encoding-decoding process is the contextual information of the sub-macro block of 4x4, such design is so that the contextual information data volume that relates in the encoding-decoding process is very huge, to the access of contextual information also very frequent complexity.
Traditional contextual information access plan mainly is divided into two classes, one class is to preserve these contextual informations in the codec chip exterior by for example firmware and software fully, and before each macro block of encoding and decoding, by firmware or the software of outside these contextual informations are offered codec, to finish encoding-decoding process, after encoding and decoding are finished, thereby firmware and software extract encoding and decoding result renewal and preserve new contextual information.This type of technical scheme needs outside firmware and software to configure contextual information, although the complexity that contextual access is finished the hardware designs that can reduce codec itself by firmware or the software of outside, but this scheme can interrupt the calculation process of codec, because when with codec hardware each syntactic element being carried out encoding and decoding, if need contextual information, then must send the contextual information that hardware needs to hardware by firmware or the software of outside, then hardware recycles this contextual information and decodes, last hardware returns to software with current results as the update content of contextual information again, and the execution efficient that causes alternately codec of the frequent complexity between this software and hardware reduces greatly.
Another kind of scheme then is to preserve required contextual information by the hardware of codec inside fully, carries out as required access by codec.These class methods all are kept at codec hardware inside (in the chip) with contextual information, come all required contextual informations of access by hardware fully, carrying out efficient can promote greatly, but because memory space and addressing cause hardware size and complexity to increase, so that the expense of hardware designs is larger, cost is high.
Summary of the invention
The object of the invention is to solve above-mentioned shortcoming of the prior art, a kind of access method and system of contextual information of video macro block are namely proposed, can be by contextual information be carried out rational cutting, thereby can either in the process of encoding and decoding, try one's best few work that interrupts codec hardware, improve the codec operating efficiency, can reduce hardware size and logical complexity again.
One aspect of the present invention has proposed a kind of contextual information access method of video macro block, and the method comprises:
1) when codec is encoded or is decoded current macro, the contextual information of the adjacent macroblocks of described codec reading and saving in the macroblock context memory, and the contextual information that is kept at the sub-macro block of the described current macro inside in the sub-macroblock context memory;
2) described codec is encoded or is decoded described current macro according to the contextual information of described adjacent macroblocks and the contextual information of described sub-macro block;
3) in the process of the Code And Decode that carries out described current macro, in described sub-macroblock context memory, upgrade and preserve the contextual information of described sub-macro block;
4) after finishing the Code And Decode of described current macro, the contextual information of extraction current macro also is kept in the macroblock context memory.
Preferably, described macroblock context memory is configured in the outside of codec, and described sub-macroblock context memory is configured in inside or the outside of codec.
Preferably, the contextual information of described adjacent macroblocks is kept in the described macroblock context memory with the form of software or firmware, and the contextual information of described sub-macro block is kept in the described sub-macroblock context memory with example, in hardware.
Preferably, before codec is encoded or decoded, configure the contextual information of the adjacent macroblocks in the macroblock context memory by firmware or software.
Preferably, before codec is encoded or is decoded, the contextual information of each the sub-macro block in initial beggar's macroblock context memory.
Preferably, by described macroblock context memory fetch or configure contextual information in the described sub-macroblock context memory.
Another aspect of the present invention has proposed a kind of contextual information access system of video macro block, and this system comprises:
The macroblock context memory, the contextual information of this macroblock context memory stores adjacent macroblocks, order receives this macroblock context memory response and preserve the contextual information of the current macro that codec sends in reading in of sending of control device, and writes out order provides contextual information from the required adjacent macroblocks of decoding or coding current macro to codec in response to what control device sent;
Sub-macroblock context memory, the contextual information of the sub-macro block of this sub-macroblock context memory stores, upgrade and preserve the contextual information of the sub-macro block of current macro by order in reading in of sending of control device for this sub-macroblock context memory response, writes out order provides the required sub-macro block of decoding current macro for codec contextual information in response to what control device sent;
Control device in response to the request of codec, sends to described macroblock context memory and described sub-macroblock context memory and to read in order and to write out order;
Codec, the described control device of request sends and reads in order before coding or decoding beginning, thus reception and utilize the contextual information of the adjacent macroblocks that described macroblock context memory provides and the contextual information of the sub-macro block that described sub-macroblock context memory provides that current macro is encoded or decoded; The described control device of request sends and writes out order in coding or decode procedure, preserves and upgrade the contextual information of the sub-macro block in the sub-macroblock context memory according to the result of coding or decoding; And after coding or decoding are finished, to the contextual information of macroblock context memory output current macro.
Preferably, described macroblock context memory is configured in the outside of codec, and described sub-macroblock context memory is configured in inside or the outside of codec.
Preferably, the contextual information of described adjacent macroblocks is kept in the described macroblock context memory with the form of software or firmware, and the contextual information of described sub-macro block is kept in the described sub-macroblock context memory with example, in hardware.
Preferably, before codec is encoded or decoded, send the adjacent macroblocks configuration-direct to described macroblock context memory, thereby configure the contextual information of the adjacent macroblocks in the macroblock context memory by firmware or software.
Preferably, before codec is encoded or decoded, send initialization directive to sub-macroblock context memory, thus the contextual information of each the sub-macro block in the described sub-macroblock context memory of initialization.
Preferably, contextual information in the described sub-macroblock context memory is extracted or configured to wherein said macroblock context memory response in sub-macroblock context read write command.
Because the contextual information of adjacent macroblocks is preserved by for example firmware or software by the macroblock context memory in minute the present invention, and configures to codec before macro block of encoding and decoding.And the contextual information of the sub-macro block of an interior macroblocks is preserved by for example hardware by sub-macroblock context memory and is upgraded, therefore the encoding-decoding process of a macro block is continuous, improve the efficient of encoding and decoding, also reduced the complexity on the codec design simultaneously, saved cost.
Description of drawings
Fig. 1 has described the flow chart according to the contextual information access method of a kind of video macro block of the present invention;
Fig. 2 has described the schematic diagram of the embodiment that the contextual information C0-C15 of the sub-macro block in the antithetical phrase macroblock context memory reads in and write out;
Fig. 3 has described the structure chart of the contextual information access system of a kind of video macro block according to an embodiment of the invention;
Fig. 4 has described the structure chart of the contextual information access system of a kind of video macro block according to another embodiment of the invention.
Embodiment
The present invention relates to a kind of contextual information access method and system of video macro block, in this system, codec carries out encoding and decoding take macro block as unit, the contextual information that codec is required is divided into the contextual information of macro block and the contextual information of the sub-macro block in the macro block.Encoding and decoding object with codec is called " current macro " herein, contextual information between the required macro block of encoding and decoding current macro is called " contextual information of adjacent macroblocks " or " contextual information of macro block ", the contextual information of each sub-macro block of required current macro inside is called " contextual information of sub-macro block ", after encoding and decoding are finished, " contextual information of adjacent macroblocks " when " contextual information of current macro " that draws according to the result of encoding and decoding can be used as follow-up macro block decoded.Current macro is carried out the contextual information of adjacent macroblocks required in the encoding-decoding process and preserved and configure to codec by for example firmware or software by the macroblock context memory, the contextual information of the sub-macro block of required current macro is kept in the sub-macroblock context memory with the form of for example hardware in the encoding-decoding process.In the encoding-decoding process of a macro block, the contextual information of each the sub-macro block in the current macro is upgraded by codec oneself as required, and finishes access.
Fig. 1 has described the flow chart according to the contextual information access method of a kind of video macro block of the present invention, and the method comprises:
S101, when codec is encoded or is decoded current macro, the contextual information of the adjacent macroblocks of described codec reading and saving in the macroblock context memory, and the contextual information that is kept at the sub-macro block of the described current macro inside in the sub-macroblock context memory;
S102, described codec is encoded or is decoded described current macro according to the contextual information of described adjacent macroblocks and the contextual information of described sub-macro block;
S103 in the process of the Code And Decode that carries out described current macro, upgrades and preserves the contextual information of described sub-macro block in described sub-macroblock context memory;
S104, after finishing the Code And Decode of described current macro, the contextual information of extraction current macro also is kept in the macroblock context memory.
In the method for embodiment shown in Figure 1, it is the division of carrying out contextual information with video " macro block " as codec basic handling unit, the contextual information that is adjacent macroblocks is kept in the macroblock context memory, preferably, the configurable outside at codec of macroblock context memory, the contextual information of adjacent macroblocks is wherein preserved with the form of software or firmware, thereby when improving memory space, has reduced hardware size and the complexity of codec itself; And sub-macroblock context memory can be configured in inside or the outside of codec, namely be integrated on the same chip or at different chips and realize, preferably, the contextual information of the sub-macro block in the sub-macroblock context memory can example, in hardware be preserved, thereby improves the execution efficient of codec.
According to different codings or decoding scheme, the scale of sub-macro block can be 4*4 or 8*8.
In a preferred embodiment, before codec is encoded or decoded, preferably configure the contextual information of the adjacent macroblocks in the macroblock context memory by firmware or software.
In a further advantageous embodiment, before coding or decoding beginning to a macro block, can be according to the requirement of different video standards, the contextual information of each the sub-macro block in initial beggar's macroblock context memory.
In another preferred embodiment, the macroblock context memory also can extract or configure the contextual information in the sub-macroblock context memory.Preferably, the macroblock context memory can adopt the method for chain type I/O (chain-in/chain-out), write in order or read the contextual information of each the sub-macro block in the sub-macroblock context memory, take the sub-macro block of 4*4 as example, comprise 16 sub-macro blocks in the macro block of each 16*16, contextual information corresponding to every sub-macro block represents with C0-C15, and Fig. 2 has described the schematic diagram of the embodiment that the contextual information C0-C15 of the sub-macro block in the antithetical phrase macroblock context memory reads in and write out.Preferably, in sub-macroblock context memory, can adopt shift register to realize the above-mentioned process of reading in and write out.
Fig. 3 has described the structure chart of the contextual information access system of a kind of video macro block according to an embodiment of the invention, and this system comprises:
Macroblock context memory 301, the contextual information of these macroblock context memory 301 storage adjacent macroblocks, order receives this macroblock context memory 301 and preserve the contextual information of the current macro that codec 304 sends in response to reading in of sending of control device 303, and writes out order provides contextual information from the required adjacent macroblocks of decoding or coding current macro to codec 304 in response to what control device 303 sent;
In a preferred embodiment, macroblock context memory 301 is configurable in the outside of codec 304, and the contextual information of adjacent macroblocks is wherein preserved with the form of software or firmware; And sub-macroblock context memory 302 can be configured in inside or the outside of codec 304, for example be integrated on the same chip or at different chips from codec 304 and realize, the contextual information of the sub-macro block in its neutron macroblock context memory 302 can example, in hardware be preserved.
In another preferred embodiment shown in Figure 4, before codec is encoded or is decoded in response to coding and decoding instruction, can send the adjacent macroblocks configuration-direct to macroblock context memory 301, thereby configure the contextual information of the adjacent macroblocks in the macroblock context memory 301 by firmware or software.
In another distortion, before coding or decoding beginning to a macro block, can send initialization directive to sub-macroblock context memory 302 according to the requirement of different video standards, thus the contextual information of each the sub-macro block in initial beggar's macroblock context memory 302.
In another distortion, macroblock context memory 301 also can extract or configure contextual information in the sub-macroblock context memory 302 in response to sub-macroblock context read write command.Preferably, macroblock context memory 301 can adopt the method for chain type I/O (chain-in/chain-out), writes in order or read the contextual information of each the sub-macro block in the sub-macroblock context memory 302.
Above-described embodiment is for illustrative principle of the present invention and effect thereof, but not is used for restriction the present invention.Any those skilled in the art all can under spirit of the present invention and category, make amendment to above-described embodiment.So protection scope of the present invention, should be listed such as claims of the present invention.
Claims (12)
1. the contextual information access method of a video macro block, the method comprises:
1) when codec is encoded or is decoded current macro, the contextual information of the adjacent macroblocks of described codec reading and saving in the macroblock context memory, and the contextual information that is kept at the sub-macro block of the described current macro inside in the sub-macroblock context memory;
2) described codec is encoded or is decoded described current macro according to the contextual information of described adjacent macroblocks and the contextual information of described sub-macro block;
3) in the process of the Code And Decode that carries out described current macro, in described sub-macroblock context memory, upgrade and preserve the contextual information of described sub-macro block;
4) after finishing the Code And Decode of described current macro, the contextual information of extraction current macro also is kept in the macroblock context memory.
2. the contextual information access method of video macro block according to claim 1, wherein said macroblock context memory is configured in the outside of codec, and described sub-macroblock context memory is configured in inside or the outside of codec.
3. the contextual information access method of video macro block according to claim 1, the contextual information of wherein said adjacent macroblocks is kept in the described macroblock context memory with the form of software or firmware, and the contextual information of described sub-macro block is kept in the described sub-macroblock context memory with example, in hardware.
4. the contextual information access method of video macro block according to claim 1 wherein before codec is encoded or decoded, configures the contextual information of the adjacent macroblocks in the macroblock context memory by firmware or software.
5. the contextual information access method of video macro block according to claim 1, wherein, before codec is encoded or is decoded, the contextual information of each the sub-macro block in initial beggar's macroblock context memory.
6. the contextual information access method of video macro block according to claim 1, wherein, by described macroblock context memory fetch or configure contextual information in the described sub-macroblock context memory.
7. the contextual information access system of a video macro block, this system comprises:
The macroblock context memory, the contextual information of this macroblock context memory stores adjacent macroblocks, order receives this macroblock context memory response and preserve the contextual information of the current macro that codec sends in reading in of sending of control device, and writes out order provides contextual information from the required adjacent macroblocks of decoding or coding current macro to codec in response to what control device sent;
Sub-macroblock context memory, the contextual information of the sub-macro block of this sub-macroblock context memory stores, upgrade and preserve the contextual information of the sub-macro block of current macro by order in reading in of sending of control device for this sub-macroblock context memory response, writes out order provides the required sub-macro block of decoding current macro for codec contextual information in response to what control device sent;
Control device in response to the request of codec, sends to described macroblock context memory and described sub-macroblock context memory and to read in order and to write out order;
Codec, the described control device of request sends and reads in order before coding or decoding beginning, thus reception and utilize the contextual information of the adjacent macroblocks that described macroblock context memory provides and the contextual information of the sub-macro block that described sub-macroblock context memory provides that current macro is encoded or decoded; The described control device of request sends and writes out order in coding or decode procedure, preserves and upgrade the contextual information of the sub-macro block in the sub-macroblock context memory according to the result of coding or decoding; And after coding or decoding are finished, to the contextual information of macroblock context memory output current macro.
8. the contextual information access system of video macro block according to claim 7, wherein said macroblock context memory is configured in the outside of codec, and described sub-macroblock context memory is configured in inside or the outside of codec.
9. the contextual information access system of video macro block according to claim 8, the contextual information of wherein said adjacent macroblocks is kept in the described macroblock context memory with the form of software or firmware, and the contextual information of described sub-macro block is kept in the described sub-macroblock context memory with example, in hardware.
10. the contextual information access system of video macro block according to claim 8, wherein before codec is encoded or is decoded, send the adjacent macroblocks configuration-direct to described macroblock context memory, thereby configure the contextual information of the adjacent macroblocks in the macroblock context memory by firmware or software.
11. the contextual information access system of video macro block according to claim 8, before codec is encoded or is decoded, send initialization directive to sub-macroblock context memory, thus the contextual information of each the sub-macro block in the described sub-macroblock context memory of initialization.
12. the contextual information access system of video macro block according to claim 8, contextual information in the described sub-macroblock context memory is extracted or configured to wherein said macroblock context memory response in sub-macroblock context read write command.
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