CN100493193C - A method and device for carrying out buffer control to real time digital video stream - Google Patents
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Abstract
The disclosed buffer control device for real-time digital video flow comprises: two interactive data storage areas, and a buffer control module to send part video flow to data storage area and record the area position in the video flow while output image area stored in the storage area as relative position. This invention can employ at least two macro-line size space for storage, reduces hardware cost, and benefit to use MPEG4 technology in hand-held device.
Description
Technical field
The present invention relates to the image communication technology field, relate in particular to a kind of method and apparatus that the real time digital video shadow is flow to row cache control.
Background technology
Continuous development along with technology of video compressing encoding, MPEG4 (Motion Pictures Experts Group 4) has obtained using widely, the core algorithm of MPEG4 video compression, decompression: estimation, motion compensation all are based on the computing of MPEG4 macro block.The MPEG4 macro block is the data in the 16X16 pixel sampling zone in the frame of video, according to the difference of data type (brightness, colourity), can be divided into Y macro block, Cb macro block, Cr macro block (with reference to accompanying drawing 1).Estimation is in reference frame to be that the macro block pixels zone (with reference to accompanying drawing 2) with the current macro optimum Match is sought at the center with the current macro.And deducting the optimum Match macro block, current macro obtains brightness, colourity residual error macro block, be encoded with the motion vector of describing the match block position, residual error macro block behind the coding all will be through decoding in MPEG4 video compression, decompression process, with the new reference macroblock of optimum Match macro block addition reconstruct, i.e. motion compensation (with reference to accompanying drawing 3).
" frame " buffer memory controlling mechanism that general MPEG4 video compression, decompression module adopt needs the spatial cache of 2 whole frame sizes to carry out ping-pong operation.One is used to store compression input data frame or the decompression output data frame that is dynamically updating, and it two is used to store and has stablized complete compression input data frame or decompression output data frame.Idiographic flow (with reference to accompanying drawing 4): from the compression input data frame or the decompression output data frame of A port input, store data storage area A or B into whole frame, initially, data storage area A is arrived in first frame buffer of compression input data frame or decompression output data frame, the second number frame buffer that to compress input data frame or decompression output data frame again is to data storage area B, when first frame after data storage area A buffer memory is finished, its interior data can be transferred to the Frame processing module and handle, after disposing, this data storage area can receive a new whole frame data storage from the A port again; When second frame after data storage area B buffer memory is finished, data can be transferred to the Frame processing module and handle in it, after disposing, this data storage area can receive a new whole frame data storage from the A port again; So circulation, the described Frame processing module that is sent to of the Frame ping-pong buffer of A port input is handled in the switching that data storage area A and B cooperatively interact.This structure applications is when the MPEG4 video compression, and corresponding data frame processing module is the MPEG4 video compressing module; This structure applications is when the MPEG4 video decompression, and corresponding data frame processing module is a display module.
Existing " frame " buffer memory controlling mechanism, require usually two each other the data storage area A of ping-pong operation and B physical size respectively with the equal and opposite in direction of a complete data frame.In order to solve the problem of big image size data frame buffer being supported at smaller memory headroom, available technology adopting is written to a frame image data line by line in two buffers of carrying out ping-pong operations and realizes.Yet in the prior art, this a frame image data is written to two methods of operation in the buffer of carrying out ping-pong operations line by line, can produces certain influence real-time.
Summary of the invention
In order to overcome above-mentioned defective, the object of the present invention is to provide a kind ofly the real time digital video shadow to be flow to the method and apparatus of row cache control to what the MPEG4 image carried out buffer memory control, have higher real-time.
For achieving the above object, the present invention by the following technical solutions: a kind of the real time digital video shadow is flow to the method for row cache control, is used for the MPEG4 video encoding-decoding process, comprise the steps:
Steps A, the video shadow that sends real time digital video shadow stream flows the partial image region that is made of one or more local correlations zone in the frame, to the data storage area of the pre-sizing that is in accepting state; Simultaneously, write down the position of this partial image region in video shadow stream frame;
Step B, ping-pong operation is carried out with the data storage area of the pre-sizing that is in output state in the data storage area that is in the pre-sizing of accepting state;
Step C is in the partial image region of storing in the data storage area of output state, according to the position output of this partial image region in video shadow stream frame; Wherein,
Described local correlations dividing region method is: video shadow stream frame is divided into several zones, and the more new sequences of each intra-zone can have more new sequences repeatedly, and between any two zones not more new sequences repeatedly, thereby determine that such zone is the local correlations zone.
Preferably: in the described method that the real time digital video shadow is flow to row cache control, in the MPEG4 video coding process, described video shadow stream frame is a video shadow stream incoming frame; In the MPEG4 video decoding process, described video shadow stream frame is the decompression output frame.
Preferably: in the described method that the real time digital video shadow is flow to row cache control, do the time spent at no deblocking effect, described local correlations dividing region is specially: interior per 16 pixel columns of every frame are divided into the zone of a local correlations.
Preferably: in the described method that the real time digital video shadow is flow to row cache control, under the mode of operation that the deblocking effect function comes into force in video decoding process, as the deblocking effect zone of action is a block boundary both sides positive and negative N pixel column, then the area dividing of this local correlations is specially, for the frame head part, begin a downward translation N pixel column from every frame frame head, as a local correlations zone, capable downward from N+1, per 16 pixel columns to the postamble part, are upwards got 32-N pixel column as a local correlations zone from postamble as a local correlations zone, wherein N gets natural number, and its maximum is 8.
Preferably: in the described method that the real time digital video shadow is flow to row cache control, the physical size of the data storage area of described pre-sizing at least with the equal and opposite in direction in a maximum local correlations zone.
Preferably: in the described method that the real time digital video shadow is flow to row cache control, the physical size of the data storage area of described pre-sizing and video shadow flow the equal and opposite in direction of the partial image region of frame.
A kind of the real time digital video shadow is flow to the device of row cache control, is used for the MPEG4 video encoding-decoding process, comprising:
Two data storage areas of the pre-sizing of ping-pong operation each other, after the partial image region that is made of one or more local correlations zone in the video shadow stream frame is received in the data storage area that is in accepting state, just can transfer output state to, the data storage area that is in output state just can transfer input state to after sending the partial image region that is made of one or more local correlations zone in the video shadow stream frame;
One buffer memory control module;
Wherein, the buffer memory control module sends the partial image region that is made of one or more local correlations zone in the video shadow stream frame to the predetermined size data memory block that is in accepting state, and writes down the position of this partial image region in video shadow stream frame; And will be in the partial image region of storing in the predetermined size data memory block of output state, according to the position output of this partial image region in video shadow stream frame.
Preferably: in the described device that the real time digital video shadow is flow to row cache control, described buffer memory control module comprises: address mapping unit, transmission control unit and output map unit,
Wherein, transmission control unit is sent to the data storage area that is in accepting state with the partial image region that is made of one or more local correlations zone in the video shadow stream frame, the data storage area of two pre-sizings of control carries out ping-pong operation, and described partial image region is exported in the data storage area that is in output state;
Address mapping unit is used for the absolute address` of recording section image-region at video shadow stream frame, and by transmission control unit this absolute address` is sent to the output map unit; When making the data storage area output image-region be in output state, according to the absolute address` output of this partial image region in video shadow stream frame.
Preferably: in the described device that the real time digital video shadow is flow to row cache control, the physical size of the data storage area of described pre-sizing and video shadow flow the equal and opposite in direction of the partial image region of frame.
The present invention is in peripheral " partial image region " buffer memory controlling mechanism that increases of general MPEG4 compression and decompression module, replace existing frame buffer controlling mechanism, utilizing the buffer memory control module is that unit sends to the data storage area data with the partial image region of video shadow stream frame, the data storage area is that unit carries out ping-pong operation with the partial image region, then output; So only need the spatial cache of two " partial image region " sizes to be used for storage transmission digital video shadow flow data, greatly reduced hardware costs, be beneficial to the mobile communication equipment that MPEG4 compression, decompression technique is applied to support big picture size, improved the real-time that view data is handled in the video shadow stream simultaneously.
Description of drawings
Fig. 1 is a MPEG4 macroblock structure schematic diagram;
Fig. 2 is a MPEG4 macro block estimation schematic diagram;
Fig. 3 is a MPEG4 macro block motion compensation schematic diagram;
Fig. 4 is the ping-pong operation schematic diagram;
Fig. 5 is the method flow diagram of embodiment 1;
Fig. 6 is the structure drawing of device of embodiment 1;
Fig. 7 is the macro-block line local correlations figure under " deblocking effect " effect;
Fig. 8 is the method flow diagram of embodiment 2;
Fig. 9 is the structure drawing of device of embodiment 2;
Figure 10 is the concrete transmission course schematic diagram of N the Frame of embodiment 2.
Embodiment
Inventive concept of the present invention is: the partial image region with the video shadow stream frame of real time digital video shadow stream is a unit, carries out ping-pong operation in the data storage area of two pre-sizings.Described partial image region comprises at least one local correlations zone.
Output frame with the output of MPEG4 video decompression module is the method that example is explained the local correlations area dividing below: the decompression output frame of MPEG4 video decompression module output more can be divided into the zone that several have local correlations on the new sequences, promptly at each intra-zone, more new sequences jumps before and after may being repeatedly, but more new sequences is not repeatedly between any two local correlations zones.
With reference to the output frame structural table, in MPEG4, its frame structure is as shown in the table:
That is, MPEG4 is when carrying out the coding and decoding of image, and usually the macro block (macro block) with the 16x16 pixel is that unit carries out data processing, the view data of decompression output frame be divided into several macro blocks (X, Y).The MPEG4 video decompression is unit output with the macro block, and its output is in proper order: (1,1), (1,2), (1,3) ... (1, N), (2,1) ... (M, 1) ... (M, N), from macro block (1,1) to macro block (1, N) be referred to as a macro-block line, in each macro-block line inside, the more new sequences of dateout jumps before and after may being repeatedly; Between any two macro-block line, then do not have such jump repeatedly, promptly between first macro-block line and second macro-block line or and other macro-block line between do not jump repeatedly.Therefore, can deserve to be called the zone that the macro block behavior stated has local correlations.
In the MPEG4 video coding process, video shadow stream frame of the present invention is video shadow stream incoming frame; In the MPEG4 video decoding process, video shadow stream frame of the present invention is the decompression output frame.
Present embodiment is applied to method and apparatus in the MPEG4 video coding process for the present invention.
With reference to accompanying drawing 5, in the MPEG4 video coding process, the real time digital video shadow is flow to the method that row cache is controlled, specifically comprise the steps:
Step 2 after the data storage area storage area image-region that is in accepting state finishes, transfers output state to; Simultaneously, the data storage area of another pre-sizing transfers accepting state to, continues to receive the next part image-region;
Step 3 is in the partial image region of storing in the data storage area of output state, according to the position output of this partial image region in video shadow stream incoming frame.
With reference to accompanying drawing 6, the device that the real time digital video shadow is flow to row cache control comprises: video shadow stream input module, buffer memory control module, system's ahb bus, two pre-sizings be the data storage area A and the data storage area B of ping-pong operation each other, and the MPEG4 video compressing module; Wherein, the buffer memory control module comprises: address mapping unit, transmission control unit and output map unit, transmission control unit with in the video shadow stream incoming frame by one or more local correlations zone constitute partial image region be sent to the data storage area that is in accepting state, the data storage area of two pre-sizings of control carries out ping-pong operation, and described partial image region is exported in the data storage area that is in output state; Address mapping unit is used for the absolute address` of the partial image region of recording of video shadow stream incoming frame at video shadow stream incoming frame, and by transmission control unit this absolute address` is sent to the output map unit; Make when the partial image region of described output frame is exported in the data storage area that is in output state, according to the absolute address` output of this partial image region in video shadow stream incoming frame.
The present invention is work like this to the device that the real time digital video shadow flows to row cache control:
1, the video shadow stream input module output image-region first time
When video shadow stream input module was prepared output video shadow stream incoming frame, system default data storage area A was for dynamically updating the memory block, for can accepting state; (with partial image region is a macro block behavior example to the partial image region of address mapping unit record preparation output, for the first time output should be first macro-block line of first frame) absolute address` in video shadow stream incoming frame, first macro-block line that video shadow stream input module is exported is via system's ahb bus then, be stored among the data storage area A, the absolute address` of first macro-block line that will write down simultaneously in video shadow stream incoming frame is transferred to the output map unit by transmission control unit.
After data storage area A Data Update finishes, stop transfer of data.At this moment, transmission control unit is changed to data storage area A can output state, because do not have data among the data storage area B this moment, it is changed to can accepting state.
2, the video shadow stream input module output image-region second time
When transmission control unit find data storage area A be can output state and data storage area B for after can accepting state, video shadow stream input module prepares to export second partial image region (second macro-block line of first frame).
The absolute address` of second macro-block line in video shadow stream incoming frame of output prepared in the address mapping unit record, second macro-block line with the output of video shadow stream input module is stored among the data storage area B via system's ahb bus then, with the absolute address` of second macro-block line in video shadow stream incoming frame, be transferred to the output map unit simultaneously by transmission control unit.After data storage area B Data Update finishes, stop transfer of data, and put data storage area B for can output state.
When data storage area B receives data, data storage area A exports to display module according to the absolute address` of first partial image region of storing in the output map unit in video shadow stream incoming frame, after output finished, data storage area A is changed to can accepting state.
3, go round and begin again, finish until 1 to N output frame output.
Embodiment 2
Present embodiment is applied to method and apparatus in the MPEG4 video decoding process for the present invention.
The one of ordinary skilled in the art is known, and the MPEG4 video decode exists normal mode of operation and " deblocking effect " mode of operation.
Under normal mode of operation, present embodiment can adopt aforesaid method to divide the local correlations zone, and promptly a local correlations zone comprises one or more macro-block line.
And in that (there is deblocking effect in real time digital video shadow stream when decompressing under the mode of operation that MPEG4 video decompression module " deblocking effect " function comes into force, when compression, there is not deblocking effect), with reference to accompanying drawing 7, the Data Update of decompression output frame still has the local correlations of the macro-block line of being similar to.At this moment, as the deblocking effect zone of action is a block boundary both sides positive and negative N pixel column, then the area dividing of this local correlations is specially, for the frame head part, begin a downward translation N pixel column from every frame frame head, as a local correlations zone, this is minimum local correlations zone in this frame; Capable downward from N+1, per 16 pixel columns to the postamble part, are upwards got 32-N pixel column as a local correlations zone from postamble as a local correlations zone, and wherein N gets natural number, and its maximum is 8.This is maximum local correlations zone in this frame, at this moment, the physical size of the data storage area of described pre-sizing at least with the equal and opposite in direction in a maximum local correlations zone.
For example: the zone of supposing " deblocking effect " effect is 8 pixel columns of 16X16 macro block up-and-down boundary both sides, the area dividing of this local correlations should begin 8 pixel columns of downward translation from every frame frame head, like this, the zone of this first local correlations of frame is 8 pixel columns, the centre is several 16 pixel columns, the zone of corresponding last local correlations is 24 pixel columns, at this moment, the physical size of the data storage area of described pre-sizing at least with the equal and opposite in direction of a maximum local correlations zone (24 pixel columns).
With reference to accompanying drawing 8, in the MPEG4 video decoding process, the method that the real time digital video shadow is flow to row cache control specifically comprises the steps:
The first step by the partial image region of buffer memory control module with the decompression output frame of video decompression module output, exports the data storage area of the pre-sizing that is in accepting state to; Simultaneously, the buffer memory control module writes down the mapping position of this partial image region in the decompression output frame;
Second step after the data storage area storage area image-region that is in accepting state finishes, transferred output state to, exported the partial image region of its storage to display module; Simultaneously, the data storage area of another pre-sizing transfers accepting state under the control of buffer memory control module, continues to receive the next part image-region that MPEG4 video decompression module sends;
In the 3rd step, display module shows the partial image region of the data storage area transmission that is in output state in the mapping position of buffer memory control module record.
With reference to accompanying drawing 9, at the MPEG4 video decoding process, the device that the real time digital video shadow is flow to row cache control comprises: MPEG4 video decompression module, buffer memory control module, system's ahb bus, two pre-sizings be the data storage area A and the data storage area B of ping-pong operation each other, and display module; Wherein, the buffer memory control module comprises: address mapping unit, transmission control unit and output map unit, transmission control unit is sent to the data storage area that is in accepting state with the partial image region of decompression output frame, the data storage area of two pre-sizings of control carries out ping-pong operation, and described partial image region is exported in the data storage area that is in output state; Address mapping unit is used for writing down the absolute address` of the partial image region of output frame at output frame, and by transmission control unit this absolute address` is sent to the output map unit; Make when the partial image region of described decompression output frame is exported in the data storage area that is in output state, according to the absolute address` output of this partial image region in the decompression output frame.
The present invention is work like this to the device that the real time digital video shadow flows to row cache control:
1, the MPEG4 video decompression module output image-region first time
When MPEG4 video decompression module was prepared output decompression output frame, system default data storage area A was for dynamically updating the memory block, for can accepting state; (with partial image region is a macro block behavior example to the partial image region of address mapping unit record preparation output, for the first time output should be first macro-block line of first frame) absolute address` in the decompression output frame, first macro-block line that the decompression of MPEG4 video decompression module is exported is via system's ahb bus then, be stored among the storage A, the absolute address` of first macro-block line in the decompression output frame that will write down simultaneously is transferred to the output map unit by transmission control unit.
After data storage area A Data Update finishes, stop transfer of data.At this moment, transmission control unit is changed to data storage area A can output state, because do not have data among the data storage area B this moment, it is changed to can accepting state.
2, the MPEG4 video decompression module output image-region second time
When transmission control unit find data storage area A be can output state and data storage area B for after can accepting state, MPEG4 video decompression module prepares to export second partial image region (second macro-block line of first frame).
The absolute address` of second macro-block line in the decompression output frame of output prepared in the address mapping unit record, second macro-block line exporting that then MPEG4 video decompression module decompressed is stored among the data storage area B via system's ahb bus, with the absolute address` of second macro-block line in the decompression output frame, be transferred to the output map unit simultaneously by transmission control unit.After data storage area B Data Update finishes, stop transfer of data, and put data storage area B for can output state.
When data storage area B receives data, data storage area A exports to display module according to the absolute address` of first partial image region in the decompression output frame of storing in the output map unit, after output finished, data storage area A is changed to can accepting state.
3, go round and begin again, finish until 1 to N output frame output.(as shown in figure 10).
Claims (9)
1, a kind of the real time digital video shadow is flow to the method for row cache control, be used for the MPEG4 video encoding-decoding process, comprise the steps:
Steps A, the video shadow that sends real time digital video shadow stream flows the partial image region that is made of one or more local correlations zone in the frame, to the data storage area of the pre-sizing that is in accepting state; Simultaneously, write down the position of this partial image region in video shadow stream frame;
Step B, ping-pong operation is carried out with the data storage area of the pre-sizing that is in output state in the data storage area that is in the pre-sizing of accepting state;
Step C is in the partial image region of storing in the data storage area of output state, according to the position output of this partial image region in video shadow stream frame; Wherein,
Described local correlations dividing region method is: video shadow stream frame is divided into several zones, and the more new sequences of each intra-zone can have more new sequences repeatedly, and between any two zones not more new sequences repeatedly, thereby determine that such zone is the local correlations zone.
2, according to claim 1 the real time digital video shadow is flow to the method for row cache control, it is characterized in that: in the MPEG4 video coding process, described video shadow stream frame is a video shadow stream incoming frame; In the MPEG4 video decoding process, described video shadow stream frame is the decompression output frame.
3, the method that the real time digital video shadow is flow to row cache control according to claim 1, it is characterized in that, do the time spent at no deblocking effect, described local correlations dividing region is specially: per 16 pixel columns are divided into the zone of a local correlations in every frame.
4, the method that the real time digital video shadow is flow to row cache control according to claim 1, it is characterized in that: under the mode of operation that the deblocking effect function comes into force in video decoding process, as the deblocking effect zone of action is a block boundary both sides positive and negative N pixel column, then the area dividing of this local correlations is specially, for the frame head part, begin a downward translation N pixel column from every frame frame head, as a local correlations zone, this is minimum local correlations zone in this frame; Capable downward from N+1, per 16 pixel columns are as a local correlations zone, to the postamble part, upwards get 32-N pixel column as a local correlations zone from postamble, wherein N gets natural number, and its maximum is 8, and this is maximum local correlations zone in this frame.
5, according to claim 4 the real time digital video shadow is flow to the method for row cache control, it is characterized in that, the physical size of the data storage area of described pre-sizing at least with the equal and opposite in direction in a maximum local correlations zone.
6, according to claim 3 the real time digital video shadow is flow to the method for row cache control, it is characterized in that, the physical size of the data storage area of described pre-sizing and video shadow flow the equal and opposite in direction of the partial image region of frame.
7, a kind of the real time digital video shadow is flow to the device of row cache control, is used for the MPEG4 video encoding-decoding process, it is characterized in that comprising:
Two data storage areas of the pre-sizing of ping-pong operation each other, after the partial image region that is made of one or more local correlations zone in the video shadow stream frame is received in the data storage area that is in accepting state, just can transfer output state to, the data storage area that is in output state just can transfer input state to after sending the partial image region that is made of one or more local correlations zone in the video shadow stream frame;
One buffer memory control module;
Wherein, the buffer memory control module sends the partial image region that is made of one or more local correlations zone in the video shadow stream frame to the predetermined size data memory block that is in accepting state, and writes down the position of this partial image region in video shadow stream frame; And will be in the partial image region of storing in the predetermined size data memory block of output state, according to the position output of this partial image region in video shadow stream frame.
8, according to claim 7 the real time digital video shadow is flow to the device of row cache control, it is characterized in that described buffer memory control module comprises: address mapping unit, transmission control unit and output map unit,
Wherein, transmission control unit is sent to the data storage area that is in accepting state with the partial image region that is made of one or more local correlations zone in the video shadow stream frame, the data storage area of two pre-sizings of control carries out ping-pong operation, and described partial image region is exported in the data storage area that is in output state;
Address mapping unit is used for the absolute address` of recording section image-region at video shadow stream frame, and by transmission control unit this absolute address` is sent to the output map unit; When making the data storage area output image-region be in output state, according to the absolute address` output of this partial image region in video shadow stream frame.
9, described the real time digital video shadow is flow to the device of row cache control according to claim 7 or 8, it is characterized in that, the physical size of the data storage area of described pre-sizing and video shadow flow the equal and opposite in direction of the partial image region of frame.
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