CN108965881A - Bit rate control method, system, server and readable storage medium storing program for executing - Google Patents
Bit rate control method, system, server and readable storage medium storing program for executing Download PDFInfo
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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
- H04N19/176—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 block, e.g. a macroblock
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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
- H04N19/124—Quantisation
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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
- H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
- H04N19/96—Tree coding, e.g. quad-tree coding
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Abstract
The present invention provides a kind of bit rate control method, system, server and readable storage medium storing program for executing, and the bit rate control method includes: the current macro that current frame image is obtained according to the practical code stream of practical code stream, current frame image and current frame image target code stream of previous frame image or the target code stream of code tree；The quantization parameter of the current macro or code tree quantizing process is obtained according to the target code stream of the current macro or code tree.The present invention is according to each macro block of previous frame or the actual code stream size of code tree, come guide the corresponding macro block of present frame or code tree target code stream size distribution, the accuracy of present frame code stream size, while computation complexity very little effectively are improved, and is easy to hardware realization.
Description
Technical field
The present invention relates to field of image processings, are each macro block or coding tree unit point more particularly to video coding process
Method and device with target bit rate, specially a kind of bit rate control method, system, server and readable storage medium storing program for executing.
Background technique
For network transmission, channel width be it is very limited, i.e., no second transmission code stream size have the upper limit, because
The accuracy of this code rate control just will affect the stability and accuracy of network transmission.Current code rate control is asked there are some
Topic, such as code rate control are accurate, and computation complexity is very big, and the code rate control that computation complexity is small, accuracy be not high.
Summary of the invention
In order to solve above-mentioned and other potential technical problems, the embodiment provides a kind of controls of code rate
Method, the bit rate control method include: according to the practical code stream of practical code stream, current frame image of previous frame image and current
Frame image object code stream obtains the current macro of current frame image or the target code stream of code tree；According to the current macro or volume
The target code stream of code tree obtains the quantization parameter of the current macro or code tree quantizing process.
In one embodiment of the invention, the practical code stream of the current frame image and current frame image target code stream are obtained
Take process are as follows: distribute target code stream for current frame image and obtain each macro block or the object code of code tree in current frame image
Stream；Record the practical code stream of each macro block of current frame image or code tree；When the current frame image is not I frame image, point
The current frame image in the current frame image until the upper macro block or code tree of current macro or code tree is not obtained
Current frame image target code stream in practical code stream and the current frame image until current macro or code tree.
In one embodiment of the invention, the acquisition process of the practical code stream of the previous frame image are as follows: obtain previous frame
Each macro block or the practical code stream of code tree in image；According to the actual code of each macro block or code tree in the previous frame image
Stream obtains macro block corresponding with current macro in the current frame image or code tree or code tree in the previous frame image
The practical corresponding code stream of previous frame image only；According to current frame image target code stream, previous frame image object code stream and institute
State the practical code stream that practical correspondence code stream obtains previous frame image.
In one embodiment of the invention, the practical code stream of the previous frame image are as follows:
Wherein, Real_Bit2 is the practical code stream of previous frame image, and WTarget_Bit1 is the mesh of present frame whole image
Coding stream, WTarget_Bit2 are the target code stream of previous frame whole image, and Real_Bit0 is to work as in previous frame image with described
The practical corresponding code stream of previous frame image in prior image frame until current macro or the corresponding macro block of code tree or code tree.
In one embodiment of the invention, the practical code stream of practical code stream, current frame image according to previous frame image
And current frame image target code stream obtains the current macro of current frame image or the target code stream of code tree specifically:
Curr_Mb_Bit=(Target_Bit × a+Real_Bit2 × b)-Real_Bit1；
Wherein, Curr_Mb_Bit is the target code stream of current macro or code tree, and Target_Bit is current frame image mesh
Coding stream, Real_Bit1 are the practical code stream of current frame image, and Real_Bit2 is the practical code stream of previous frame image, and a, b are to adjust
Integral coefficient.
In one embodiment of the invention, the value range of regulation coefficient a is 0~1, and the value range of regulation coefficient b is 0
~1, and meet a+b=1.
The present embodiment also provides a kind of code rate control system, and the code rate control system includes: that code stream obtains module, is used for
Present frame figure is obtained according to the practical code stream of practical code stream, current frame image of previous frame image and current frame image target code stream
The current macro of picture or the target code stream of code tree；Quantization parameter obtains module, for according to the current macro or code tree
Target code stream obtain the quantization parameter of the current macro or code tree quantizing process.
In one embodiment of the invention, it includes: allocation unit that the code stream, which obtains module, for dividing for current frame image
With target code stream and obtain each macro block or the target code stream of code tree in current frame image；Recording unit, it is current for recording
The each macro block of frame image or the practical code stream of code tree；The practical code stream unit of current frame image, in the current frame image
When not being I frame image, obtain in the current frame image until the upper macro block or code tree of current macro or code tree
The practical code stream of current frame image；Current frame image target code stream unit, for not being I frame image in the current frame image
When, obtain the current frame image target code stream in the current frame image until current macro or code tree.
In one embodiment of the invention, the code stream obtains module further include: the practical code stream unit of previous frame image:
For obtaining each macro block or the practical code stream of code tree in previous frame image, according to each macro block in the previous frame image or
The practical code stream of code tree obtains corresponding with current macro in the current frame image or code tree in the previous frame image
The practical corresponding code stream of previous frame image until macro block or code tree, and according to current frame image target code stream, previous frame figure
As target code stream and the practical corresponding code stream obtain the practical code stream of previous frame image.
In one embodiment of the invention, the practical code stream unit of the previous frame image obtains upper one with specific reference to following formula
The practical code stream of frame image:
Wherein, Real_Bit2 is the practical code stream of previous frame image, and WTarget_Bit1 is the mesh of present frame whole image
Coding stream, WTarget_Bit2 are the target code stream of previous frame whole image, and Real_Bit0 is to work as in previous frame image with described
The practical corresponding code stream of previous frame image in prior image frame until current macro or the corresponding macro block of code tree or code tree.
In one embodiment of the invention, the practical code stream of practical code stream, current frame image according to previous frame image
And current frame image target code stream obtains the current macro of current frame image or the target code stream of code tree specifically:
Curr_Mb_Bit=(Target_Bit × a+Real_Bit2 × b)-Real_Bit1；
Wherein, Curr_Mb_Bit is the target code stream of current macro or code tree, and Target_Bit is current frame image mesh
Coding stream, Real_Bit1 are the practical code stream of current frame image, and Real_Bit2 is the practical code stream of previous frame image, and a, b are to adjust
Integral coefficient.
In this present embodiment, the value range of regulation coefficient a is 0~1, and the value range of regulation coefficient b is 0~1, and full
Sufficient a+b=1.
The embodiment of the present invention also provides a kind of server, including processor and memory, and the memory is stored with journey
Sequence instruction, the processor operation program instruction realize the step in method as described above.
The embodiment of the present invention also provides a kind of computer readable storage medium, is stored thereon with computer program, special
Sign is that the program realizes the step in method as described above when being executed by processor.
As described above, bit rate control method of the invention, system, server and readable storage medium storing program for executing have below beneficial to effect
Fruit:
The present invention is according to each macro block of previous frame or the actual code stream size of code tree, to guide present frame corresponding macro
The distribution of the target code stream size of block or code tree effectively improves the accuracy of present frame code stream size, while calculating multiple
Miscellaneous degree very little, and it is easy to hardware realization.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is shown as the flow diagram of bit rate control method of the invention.
Fig. 2 is shown as the practical code stream of current frame image and current frame image object code in bit rate control method of the invention
The acquisition process flow diagram of stream.
The process that Fig. 3 is shown as the acquisition process of the practical code stream of previous frame image in bit rate control method of the invention is shown
It is intended to.
Fig. 4 is shown as the functional block diagram of code rate control system of the invention.
Fig. 5 is shown as the functional block diagram that code stream in code rate control system of the invention obtains module.
Component label instructions
1 code rate control system
10 code streams obtain module
110 allocation units
120 recording units
The practical code stream unit of 130 current frame images
140 current frame image target code stream units
The practical code stream unit of 150 previous frame images
20 quantization parameters obtain module
S100~S200 step
S111~S114 step
S121~S123 step
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
Fig. 1 is please referred to Fig. 5.It should be clear that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to
Cooperate the revealed content of specification, so that those skilled in the art understands and reads, being not intended to limit the invention can be real
The qualifications applied, therefore do not have technical essential meaning, the tune of the modification of any structure, the change of proportionate relationship or size
It is whole, in the case where not influencing the effect of present invention can be generated and the purpose that can reach, it should all still fall in disclosed skill
Art content obtains in the range of capable of covering.Meanwhile in this specification it is cited as "upper", "lower", "left", "right", " centre " and
The term of " one " etc. is merely convenient to being illustrated for narration, rather than to limit the scope of the invention, relativeness
It is altered or modified, under the content of no substantial changes in technology, when being also considered as the enforceable scope of the present invention.
The purpose of the present embodiment is that providing a kind of bit rate control method, system, server and readable storage medium storing program for executing, it is used for
Solve the problems, such as that code rate control unit is accurate in the prior art, complexity is big.Code rate controlling party of the invention described in detail below
Method, system, the principle and embodiment of server and readable storage medium storing program for executing, make those skilled in the art not need creative work
It is appreciated that bit rate control method of the invention, system, server and readable storage medium storing program for executing.
The present embodiment is directed to the defect of current code rate control, proposes one convenient for hard-wired macro block (MB) or encodes
Set the code rate control of unit (CTU) grade.Wherein, macro block is H.264 defined in agreement, and code tree is H.265 fixed in agreement
Justice, during transmission of video images, all images are divided into macro block or code tree in video sequence, are then compressed again
Coding.The present embodiment passes through the code stream size of each MB or CTU in record previous frame, then is used to that present frame is guided to correspond to MB
Or the Bit allocation of CTU.Through this embodiment, the code stream size that can reasonably distribute present frame each MB or CTU, to improve
Accuracy (i.e. object code of the obtained code stream size of present frame actual coding with distributing to present frame of the code stream size of present frame
It is closer to flow size), and then promote the efficiency of transmission of network layer.
Embodiment 1
Specifically, as shown in Figure 1, present embodiments providing a kind of bit rate control method, the bit rate control method includes:
Step S100, according to the practical code stream of practical code stream, current frame image and current frame image mesh of previous frame image
Coding stream obtains the current macro of current frame image or the target code stream of code tree.
Step S200 obtains the current macro or code tree amount according to the target code stream of the current macro or code tree
The quantization parameter of change process.
Step S100~step S200 in the bit rate control method described in the present embodiment is described in detail below.
Step S100, according to the practical code stream of practical code stream, current frame image and current frame image mesh of previous frame image
Coding stream obtains the current macro of current frame image or the target code stream of code tree.
Wherein, in this present embodiment, as shown in Fig. 2, the practical code stream of the current frame image and current frame image target
The acquisition process of code stream comprises the steps of:
Step S111 is that current frame image distributes target code stream and obtains each macro block or code tree in current frame image
Target code stream.
The practical code stream of step S112, each macro block of record current frame image or code tree.
Step S113 judges whether the current frame image is I frame image, if it is not, then then executing step S114, respectively
The current frame image obtained in the current frame image until the upper macro block or code tree of current macro or code tree is real
Current frame image target code stream in border code stream and the current frame image until current macro or code tree；It is no to be, then it returns
Step S112 is returned, the practical code stream for recording each macro block of current frame image or code tree is continued.
Wherein, I frame image, that is, Intra frame image, I frame is key frame, belongs to frame data compression, and when decoding only needs this frame number
According to can complete.If current frame image is I frame image, continue the practical code stream of each macro block of current frame image or code tree,
Without necessarily referring to each macro block of each of former frame or code tree code stream.
Current macro or code tree are in the 10th position in step S113, such as in current frame image, then described to work as
The practical code stream of prior image frame is the sum of 1 to 9 macro block or the practical code stream of code tree in current frame image, the current frame image
Target code stream is the sum of 1~10 macro block or the target code stream of code tree in current frame image.
In this present embodiment, as shown in figure 3, the acquisition process of the practical code stream of the previous frame image includes following step
It is rapid:
Step S121 obtains each macro block or the practical code stream of code tree in previous frame image.
Step S122 obtains the previous frame according to each macro block in the previous frame image or the practical code stream of code tree
Previous frame image in image until macro block corresponding with current macro in the current frame image or code tree or code tree
Practical corresponding code stream.
Such as current macro or code tree are in the 10th position in current frame image, then the reality of the previous frame image
Corresponding code stream is 1~10 macro block or the practical code stream of code tree in previous frame image.
Step S123, according to current frame image target code stream, previous frame image object code stream and the practical correspondence code
Stream obtains the practical code stream of previous frame image.
Wherein, in this present embodiment, the practical code stream of the previous frame image specifically:
Wherein, Real_Bit2 is the practical code stream of previous frame image, and WTarget_Bit1 is the mesh of present frame whole image
Coding stream, WTarget_Bit2 are the target code stream of previous frame whole image, and Real_Bit0 is to work as in previous frame image with described
The practical corresponding code stream of previous frame image in prior image frame until current macro or the corresponding macro block of code tree or code tree.
In this present embodiment, the practical code stream of practical code stream, current frame image according to previous frame image and current
Frame image object code stream obtains the current macro of current frame image or the target code stream of code tree specifically:
Curr_Mb_Bit=(Target_Bit × a+Real_Bit2 × b)-Real_Bit1；
Wherein, Curr_Mb_Bit is the target code stream of current macro or code tree, and Target_Bit is current frame image mesh
Coding stream, Real_Bit1 are the practical code stream of current frame image, and Real_Bit2 is the practical code stream of previous frame image, and a, b are to adjust
Integral coefficient, wherein the value range of regulation coefficient a is 0~1, and the value range of regulation coefficient b is 0~1, and meets a+b=1,
For example, regulation coefficient a is 0.6, regulation coefficient b is 0.4
Step S200 obtains the current macro or code tree according to the target code stream of the current macro or code tree
Quantization parameter.
Wherein, rate control module can distribute the quantization parameter QP of frame level for frame image every in video sequence, according to this reality
Example is applied to each macro block or coding tree unit distribution target code stream size in every frame image, further according to the target code stream size with
The deviant qp_delta of the quantization parameter QP of each macro block or coding tree unit is calculated in pre-set threshold value comparison, from
And obtain the quantization parameter QP_MB=QP+qp_delta of current macro or coding tree unit.
The embodiment of the present invention also provides a kind of server, including processor and memory, and the memory is stored with journey
Sequence instruction, the processor operation program instruction realize the step in method as described above.Details are not described herein.
The embodiment of the present invention also provides a kind of computer readable storage medium, is stored thereon with computer program, special
Sign is that the program realizes the step in method as described above when being executed by processor.Details are not described herein.
Embodiment 2
As shown in figure 4, the code rate control system 1 includes: that code stream obtains the present embodiment provides a kind of code rate control system 1
Modulus block 10 and quantization parameter obtain module 20.
Below to the code stream in the code rate control system 1 of the present embodiment obtain module 10 and quantization parameter obtain module 20 into
Row is described in detail.
In this present embodiment, the code stream obtains module 10 for practical code stream, the present frame figure according to previous frame image
As practical code stream and current frame image target code stream obtain the current macro of current frame image or the target code stream of code tree.
Specifically, as shown in figure 5, in this present embodiment, it includes: allocation unit 110 that the code stream, which obtains module 10, record
Unit 120, the practical code stream unit 130 of current frame image and current frame image target code stream unit 140.
The allocation unit 110 is used to distribute target code stream for current frame image and obtains each macro block in current frame image
Or the target code stream of code tree.
The recording unit 120 is used to record the practical code stream of each macro block of current frame image or code tree.
The practical code stream unit 130 of current frame image is used for when the current frame image is not I frame image, obtains institute
State the practical code stream of current frame image in current frame image until the upper macro block or code tree of current macro or code tree.
Such as current macro or code tree are in the 10th position in current frame image, then the current frame image actual code
Stream is the sum of 1 to 9 macro block or the practical code stream of code tree in current frame image.
The current frame image target code stream unit 140 is used for when the current frame image is not I frame image, obtains institute
State the current frame image target code stream in current frame image until current macro or code tree.
Such as current macro or code tree are in the 10th position, the current frame image target code stream in current frame image
For the sum of 1~10 macro block or the target code stream of code tree in current frame image.
Wherein, I frame image, that is, Intra frame image, belongs to frame data compression, and when decoding only needs this frame data complete
At.If current frame image is I frame image, when calculating the target code stream of current macro or coding tree unit, without necessarily referring to before
Each macro block of one frame or the code stream of code tree.
In this present embodiment, as shown in figure 5, the code stream obtains module 10 further include: the practical code stream of previous frame image
Unit 150: for obtaining each macro block or the practical code stream of code tree in previous frame image, according in the previous frame image
Each macro block or the practical code stream of code tree obtain in the previous frame image with current macro or volume in the current frame image
The practical corresponding code stream of previous frame image until the corresponding macro block of code tree or code tree, and according to current frame image object code
Stream, previous frame image object code stream and the practical corresponding code stream obtain the practical code stream of previous frame image.
Such as current macro or code tree are in the 10th position in current frame image, then the reality of the previous frame image
Corresponding code stream is 1~10 macro block or the practical code stream of code tree in previous frame image.
In this present embodiment, the practical code stream unit 150 of the previous frame image obtains previous frame figure with specific reference to following formula
The practical code stream of picture:
Wherein, Real_Bit2 is the practical code stream of previous frame image, and WTarget_Bit1 is the mesh of present frame whole image
Coding stream, WTarget_Bit2 are the target code stream of previous frame whole image, and Real_Bit0 is to work as in previous frame image with described
The practical corresponding code stream of previous frame image in prior image frame until current macro or the corresponding macro block of code tree or code tree.
In this present embodiment, the practical code stream of practical code stream, current frame image according to previous frame image and current
Frame image object code stream obtains the current macro of current frame image or the target code stream of code tree specifically:
Curr_Mb_Bit=(Target_Bit × a+Real_Bit2 × b)-Real_Bit1；
Wherein, Curr_Mb_Bit is the target code stream of current macro or code tree, and Target_Bit is current frame image mesh
Coding stream, Real_Bit1 are the practical code stream of current frame image, and Real_Bit2 is the practical code stream of previous frame image, and a, b are to adjust
Integral coefficient.
Wherein, the value range of the regulation coefficient a is 0~1, and the value range of regulation coefficient b is 0~1, and meets a+
B=1, for example, regulation coefficient a is 0.6, regulation coefficient b is 0.4.
In this present embodiment, the quantization parameter obtains module 20 for the target according to the current macro or code tree
Code stream obtains the quantization parameter of the current macro or code tree quantizing process.
Wherein, rate control module can distribute the quantization parameter QP of frame level for frame image every in video sequence, according to this reality
Example is applied to each macro block or coding tree unit distribution target code stream size in every frame image, further according to the target code stream size with
The deviant qp_delta of the quantization parameter QP of each macro block or coding tree unit is calculated in pre-set threshold value comparison, from
And obtain the quantization parameter QP_MB=QP+qp_delta of current macro or coding tree unit.
In conclusion the present invention of the embodiment of the present invention is big according to each macro block of previous frame or the actual code stream of code tree
It is small, come guide the corresponding macro block of present frame or code tree target code stream size distribution, effectively improve present frame code stream
The accuracy of size, while computation complexity very little, and it is easy to hardware realization.So the present invention effectively overcomes the prior art
In various shortcoming and have high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, includes that institute is complete without departing from the spirit and technical ideas disclosed in the present invention for usual skill in technical field such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (14)
1. a kind of bit rate control method, which is characterized in that the bit rate control method includes:
It is obtained according to the practical code stream of practical code stream, current frame image of previous frame image and current frame image target code stream current
The current macro of frame image or the target code stream of code tree；
The quantization of the current macro or code tree quantizing process is obtained according to the target code stream of the current macro or code tree
Parameter.
2. bit rate control method according to claim 1, which is characterized in that the practical code stream of the current frame image and work as
The acquisition process of prior image frame target code stream are as follows:
Target code stream is distributed for current frame image and obtains each macro block or the target code stream of code tree in current frame image；
Record the practical code stream of each macro block of current frame image or code tree；
When the current frame image is not I frame image, obtained in the current frame image respectively to current macro or code tree
A upper macro block or code tree until the practical code stream of current frame image and the current frame image in arrive current macro or volume
Current frame image target code stream until code tree.
3. bit rate control method according to claim 2, which is characterized in that the practical code stream of the previous frame image obtains
Take process are as follows:
Obtain each macro block or the practical code stream of code tree in previous frame image；
According to each macro block in the previous frame image or the practical code stream of code tree obtain in the previous frame image with it is described
The practical corresponding code stream of previous frame image in current frame image until current macro or the corresponding macro block of code tree or code tree；
Previous frame figure is obtained according to current frame image target code stream, previous frame image object code stream and the practical corresponding code stream
The practical code stream of picture.
4. bit rate control method according to claim 3, which is characterized in that the practical code stream of the previous frame image are as follows:
Wherein, Real_Bit2 is the practical code stream of previous frame image, and WTarget_Bit1 is the object code of present frame whole image
Stream, WTarget_Bit2 be previous frame whole image target code stream, Real_Bit0 be previous frame image in the present frame
The practical corresponding code stream of previous frame image in image until current macro or the corresponding macro block of code tree or code tree.
5. bit rate control method according to claim 4, which is characterized in that the actual code according to previous frame image
Stream, the practical code stream of current frame image and current frame image target code stream obtain current macro or the code tree of current frame image
Target code stream specifically:
Curr_Mb_Bit=(Target_Bit × a+Real_Bit2 × b)-Real_Bit1；
Wherein, Curr_Mb_Bit is the target code stream of current macro or code tree, and Target_Bit is current frame image object code
Stream, Real_Bit1 are the practical code stream of current frame image, and Real_Bit2 is the practical code stream of previous frame image, and a, b are adjustment system
Number.
6. bit rate control method according to claim 5, which is characterized in that the value range of regulation coefficient a is 0~1, is adjusted
The value range of integral coefficient b is 0~1, and meets a+b=1.
7. a kind of code rate control system, which is characterized in that the code rate control system includes:
Code stream obtains module, for the practical code stream of practical code stream, current frame image and present frame figure according to previous frame image
The current macro of current frame image or the target code stream of code tree are obtained as target code stream；
Quantization parameter obtains module, for according to the target code stream of the current macro or code tree obtain the current macro or
The quantization parameter of code tree quantizing process.
8. code rate control system according to claim 7, which is characterized in that the code stream obtains module and includes:
Allocation unit, for distributing target code stream for current frame image and obtaining each macro block in current frame image or code tree
Target code stream；
Recording unit, for recording the practical code stream of each macro block of current frame image or code tree；
The practical code stream unit of current frame image, for obtaining the present frame figure when the current frame image is not I frame image
The practical code stream of current frame image as in until the upper macro block or code tree of current macro or code tree；
Current frame image target code stream unit, for obtaining the present frame figure when the current frame image is not I frame image
Current frame image target code stream as in until current macro or code tree.
9. code rate control system according to claim 8, which is characterized in that the code stream obtains module further include:
The practical code stream unit of previous frame image: for obtaining each macro block or the practical code stream of code tree in previous frame image,
According to each macro block in the previous frame image or the practical code stream of code tree obtain in the previous frame image with it is described current
The practical corresponding code stream of previous frame image in frame image until current macro or the corresponding macro block of code tree or code tree, and root
The reality of previous frame image is obtained according to current frame image target code stream, previous frame image object code stream and the practical corresponding code stream
Border code stream.
10. code rate control system according to claim 9, which is characterized in that the practical code stream list of the previous frame image
Member obtains the practical code stream of previous frame image with specific reference to following formula:
Wherein, Real_Bit2 is the practical code stream of previous frame image, and WTarget_Bit1 is the object code of present frame whole image
Stream, WTarget_Bit2 be previous frame whole image target code stream, Real_Bit0 be previous frame image in the present frame
The practical corresponding code stream of previous frame image in image until current macro or the corresponding macro block of code tree or code tree.
11. code rate control system according to claim 10, which is characterized in that the actual code according to previous frame image
Stream, the practical code stream of current frame image and current frame image target code stream obtain current macro or the code tree of current frame image
Target code stream specifically:
Curr_Mb_Bit=(Target_Bit × a+Real_Bit2 × b)-Real_Bit1；
Wherein, Curr_Mb_Bit is the target code stream of current macro or code tree, and Target_Bit is current frame image object code
Stream, Real_Bit1 are the practical code stream of current frame image, and Real_Bit2 is the practical code stream of previous frame image, and a, b are adjustment system
Number.
12. code rate control system according to claim 11, which is characterized in that the value range of regulation coefficient a is 0~1,
The value range of regulation coefficient b is 0~1, and meets a+b=1.
13. a kind of server, including processor and memory, the memory are stored with program instruction, which is characterized in that described
Processor runs step of the program instruction realization in the method as described in claim 1 to 6 any claim.
14. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
The step in the method as described in claim 1 to 6 any claim is realized when execution.
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