CN107222779B - A kind of method and device of video play-reverse - Google Patents
A kind of method and device of video play-reverse Download PDFInfo
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- CN107222779B CN107222779B CN201710427777.XA CN201710427777A CN107222779B CN 107222779 B CN107222779 B CN 107222779B CN 201710427777 A CN201710427777 A CN 201710427777A CN 107222779 B CN107222779 B CN 107222779B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
Abstract
The present invention relates to technical field of video processing, in particular to a kind of method and device of video play-reverse, it is larger that there are EMS memory occupations solving the problems, such as existing video play-reverse method.The target bit stream data that the embodiment of the present invention will acquire carries out segment processing and obtains multiple bit stream data sections；Successively target bit stream data is decoded since I frame, and the decoding picture of video frame some or all of in the bit stream data section in the decoding picture of the partial video frame in the bit stream data section in multiple bit stream data sections in the first range and the second range is stored in buffer area；Inversely shows and discharge the decoding picture stored in buffer area.Since the embodiment of the present invention is when putting to target bit stream data upside down, do not need the decoding picture for decoding each video frame in obtained bit stream data section being stored in buffer area, therefore the memory that decoding picture occupies in buffer area can be effectively reduced.
Description
Technical field
The present invention relates to technical field of video processing, in particular to a kind of method and device of video play-reverse.
Background technique
Currently, the coding mode of video file is mainly non-full I frame coding mode, the video text of non-full I frame coding mode
In part, video frame includes I frame, P frame.Inter-frame encoding as shown in Figure 1, i.e. I frame periodically occur, each period is
One GOP (Group of Pictures, picture group) bit stream data, I1, P2, P3, P4 ... Pn are a GOP code as shown in figure 1
Flow data.Wherein I frame is known as intracoded frame, be a kind of included all information independent frame its can be only without reference to other frames
It is vertical to be decoded；P frame is also referred to as inter prediction encoding frame, and P frame can not be decoded independently, it is necessary to reference to the I frame or P frame ability of front
It can be carried out coding.
I frame must be first decoded when video playing, further decoding relies on the P frame of the I frame, can be correctly decoded, and it is clear to play, it is no
It then will appear flower screen or can not play.In video play-reverse, since P frame can not individually decode broadcasting, it is necessary to rely on I frame solution
Code, and in original video files during putting upside down, I frame is in always after the P frame for relying on I frame, it is therefore desirable to be found for P frame
I frame, after finding the I frame that P frame is relied on, the decoding that can just carry out video is played.
Currently, video play-reverse method in the prior art is mainly completed by following steps:
1, it puts upside down since some video frame of video file, the video frame put upside down will be started and successively got from back to front
The data of I frame are stored in buffer area A as target bit stream data；
2, it is successively decoded since I frame, decodes the picture of all video frames in target bit stream data, be stored in buffer area B；
3, inverted order acquisition picture is shown from caching B.
The above-mentioned prior art existing main problem when doing video play-reverse is: the prior art is to deposit decoded picture
In caching B, the picture of a 1920*1080P occupies about 3MB memory for storage, wherein general P 2sGOP includes 50 pictures, it is right
The interior of caching B occupancy should be stored in and save as 150M；General N 2sGOP includes 60 pictures, corresponding to be stored in what caching B was occupied
Inside save as 180M；For the platform (such as security protection embedded device) of current memory anxiety, committed memory is huge for this.
In conclusion existing video play-reverse method has that EMS memory occupation is larger.
Summary of the invention
The present invention provides a kind of method and device of video play-reverse, and to solve existing video play-reverse method, there are memories to account for
With larger problem.
Based on the above issues, a kind of method that the embodiment of the present invention proposes video play-reverse, comprising:
The target bit stream data that will acquire carries out segment processing, multiple bit stream data sections is obtained, wherein the object code stream
Data are the data started between the video frame put upside down and I frame in a GOP bit stream data, and every section includes m video frame, described
M is positive integer；
Successively the target bit stream data is decoded since I frame, and will be first in the multiple bit stream data section
Part in the decoding picture of the partial video frame in bit stream data section in range and the bit stream data section in the second range
Or the decoding picture of all videos frame is stored in buffer area；
Inversely shows and discharge the decoding picture stored in the buffer area；Wherein, it is showing and is discharging decoding picture
In the process, the decoding picture of not stored video frame is obtained according to stored decoding picture in same bit stream data section, and deposited
It stores up in buffer area.
Since the embodiment of the present invention is when putting to target bit stream data upside down, the target bit stream data that will acquire is carried out
Segmentation, and after to the decoding of target bit stream data, by the decoding of the partial video frame in the bit stream data section in the first range
The decoding picture of video frame is stored in buffer area some or all of in bit stream data section in picture and the second range, and
It does not need the decoding picture for decoding each video frame in obtained bit stream data section being stored in buffer area, therefore can have
Effect reduces the memory that decoding picture occupies in buffer area；Also, the decoding picture in buffer area is released after the display
It puts, avoids excessive committed memory；During decoding picture display, according to stored decoding picture in same bit stream data section
The decoding picture of not stored video frame is obtained, realizes the memory sharing of the second buffer area.
Optionally, the partial video frame in the bit stream data section by the multiple bit stream data section in the first range
Decoding picture and the second range in bit stream data section in some or all of the decoding picture of video frame be stored in caching
Area, comprising:
By the solution of first video frame in the bit stream data section in the first range described in the multiple bit stream data section
The decoding picture of all videos frame in bit stream data section in code picture and second range is stored in buffer area.
Optionally, the bit stream data section in first range be the multiple bit stream data section in except final stage it
Outer all bit stream data sections；Bit stream data section in second range is the final stage in the multiple bit stream data section
Bit stream data section.
Since the embodiment of the present invention is after to the decoding of target bit stream data, only by the decoding figure of every section of the first video frame
Piece and the decoding picture of all video frames of final stage are stored in the second buffer area, and non-except other sections of final stage
The decoding picture of first frame can effectively reduce the memory of the second buffer area occupancy without saving.
Optionally, described during showing and discharging decoding picture, according to stored in same bit stream data section
Decoding picture obtains the decoding picture of not stored video requency frame data, and stores into buffer area, comprising:
During showing and discharging decoding picture, according to first video frame stored in same bit stream data section
Decoding picture, video frame not stored in the bit stream data section is decoded；
The decoding picture for the not stored video frame that decoding is obtained is stored into buffer area.
Since the second cache bank memories that the video play-reverse method of the embodiment of the present invention needs are smaller, for the second caching
The memory of area's setting is also smaller.Before beginning of putting upside down, the decoding picture and most of every section of first frame is stored in the second buffer area
The decoding picture of latter section of all frames；It after beginning of putting upside down, is discharged after one decoding picture of every display, second caching
The memory of a picture is released in area, the video frame of the last period can be decoded at this time, by decoded decoding
Picture is stored to the second buffer area, to realize the memory multiplexing of the second buffer area.
Optionally, the m value is determined according to following manner:
It being capable of decoded maximum video according to the number of video frame in a GOP bit stream data and in a GOP time
Frame number determines the m value.
Since the embodiment of the present invention is when carrying out video play-reverse, need to decode partial video frame twice, to subtract
The small occupied memory of second buffer area；But there is the upper limit to the decoding number of video frame within a GOP time, i.e.,
There are in a GOP time can decoded maximum video frame number, therefore, the decoding time of increase that can not be wireless to video frame
Number, to reduce the EMS memory occupation of the second buffer area.Therefore the embodiment of the present invention is needed according to video in a GOP bit stream data
The number of frame and in a GOP time can decoded maximum video frame number, it is reasonable to determine m value.
Optionally, described to be solved according to the number of video frame in a GOP bit stream data and in a GOP time
The maximum video frame number of code, determines the m value, specifically includes:
IfThen
IfThen
Wherein, the Gop is the number of video frame in a GOP bit stream data, and the N is can in a GOP time
Decoded maximum video frame number,Expression rounds up operation.
Since the embodiment of the present invention gives the specific method for determining m value, m value is accurately determined in varied situations, thus
The EMS memory occupation of the second buffer area can maximally reduced in the allowed band of decoding video frame number.
On the other hand, the embodiment of the present invention also provides a kind of device of video play-reverse, comprising:
Module is obtained, the target bit stream data for will acquire carries out segment processing, multiple bit stream data sections are obtained, wherein
The target bit stream data is the data started between the video frame put upside down and I frame in a GOP bit stream data, and every section includes m
A video frame, the m are positive integer；
Processing module, for being successively decoded to the target bit stream data since I frame, and by the multiple code stream
The decoding picture and the code stream number in the second range of the partial video frame in bit stream data section in data segment in the first range
Buffer area is stored according to the decoding picture of video frame some or all of in section；
Playing module, for inversely showing and discharging the decoding picture stored in the buffer area；Wherein, it is showing and is releasing
During putting decoding picture, the solution of not stored video frame is obtained according to stored decoding picture in same bit stream data section
Code picture, and store into buffer area.
Optionally, the processing module, is specifically used for:
By the solution of first video frame in the bit stream data section in the first range described in the multiple bit stream data section
The decoding picture of all videos frame in bit stream data section in code picture and the second range is stored in buffer area.
Optionally, the bit stream data section in first range be the multiple bit stream data section in except final stage it
Outer all bit stream data sections；Bit stream data section in second range is the final stage in the multiple bit stream data section
Bit stream data section.
Optionally, the processing module, is specifically used for:
During showing and discharging decoding picture, according to first video frame stored in same bit stream data section
Decoding picture, video frame not stored in the bit stream data section is decoded；Decoding is obtained described not stored
The decoding picture of video frame is stored into buffer area.
Optionally, the acquisition module, is specifically used for:
The m value is determined according to following manner:
According to the number of video frame in a GOP bit stream data and in a GOP time can decoding video frame most
Big number determines the m value.
Optionally, the acquisition module, is specifically used for:
IfThen
IfThen
Wherein, the Gop is the number of video frame in a GOP bit stream data, and the N is can in a GOP time
The maximum number of decoding video frame,Expression rounds up operation.
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 introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is inter-frame encoding schematic diagram in background technique；
Fig. 2 is the method flow diagram of video play-reverse of the embodiment of the present invention；
Fig. 3 is that the embodiment of the present invention stores target bit stream data to the method flow diagram of the first buffer area；
Fig. 4 is the schematic diagram that decoding picture is stored in the second buffer area of the embodiment of the present invention；
Fig. 5 is the overall flow figure of video play-reverse of embodiment of the present invention method；
Fig. 6 is the structural schematic diagram of video play-reverse of embodiment of the present invention device.
Specific embodiment
The target bit stream data that the embodiment of the present invention will acquire carries out segment processing, obtains multiple bit stream data sections, wherein
The target bit stream data is the data started between the video frame put upside down and I frame in a GOP bit stream data, and every section includes m
A video frame, the m are positive integer；Successively the target bit stream data is decoded since I frame, and by the multiple code
The decoding picture and the code stream in the second range of the partial video frame in bit stream data section in flow data section in the first range
The decoding picture of video frame is stored in buffer area some or all of in data segment；It inversely shows and discharges and deposited in the buffer area
The decoding picture of storage；Wherein, during showing and discharging decoding picture, according to stored solution in same bit stream data section
Code picture obtains the decoding picture of not stored video frame, and stores into buffer area.
Since the embodiment of the present invention is when putting to target bit stream data upside down, the target bit stream data that will acquire is carried out
Segmentation, and after to the decoding of target bit stream data, by the decoding of the partial video frame in the bit stream data section in the first range
The decoding picture of video frame is stored in buffer area some or all of in bit stream data section in picture and the second range, and
It does not need the decoding picture for decoding each video frame in obtained bit stream data section being stored in buffer area, therefore can have
Effect reduces the memory that decoding picture occupies in buffer area；Also, the decoding picture in buffer area is released after the display
It puts, avoids excessive committed memory；During decoding picture display, according to stored decoding picture in same bit stream data section
The decoding picture of not stored video frame is obtained, realizes the memory sharing of the second buffer area.
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
The embodiment of the present invention is described in further detail with reference to the accompanying drawings of the specification.
As shown in Fig. 2, a kind of video play-reverse method provided in an embodiment of the present invention, comprising:
Step 201, the target bit stream data that will acquire carry out segment processing, obtain multiple bit stream data sections, wherein described
Target bit stream data is the data started between the video frame put upside down and I frame in a GOP bit stream data, and every section includes m view
Frequency frame, the m are positive integer；
Step 202 is successively decoded the target bit stream data since I frame, and by the multiple bit stream data
The decoding picture of the partial video frame in bit stream data section in section in the first range and the bit stream data section in the second range
In some or all of the decoding picture of video frame be stored in buffer area；
Step 203 inversely shows and discharges the decoding picture stored in the buffer area；Wherein, it is showing and is discharging solution
During code picture, the decoding figure of not stored video frame is obtained according to stored decoding picture in same bit stream data section
Piece, and store into buffer area.
In present example, the video file put upside down be encoded with non-full I frame coding mode, such as
Coding mode can be H264, the formats such as H265, MPEG-4.
By taking general N video file as an example, video code flow format can be with are as follows: I1-P101-P102 ... P159-I2-
P201-P202- ... P259 ..., by taking one of GOP bit stream data I1-P101-P102 ... P159 as an example, wherein I1
For I frame, P101~P159 respectively indicates 59 P frames, in decoding, it is necessary to and it is first decoding I frame, according to I frame decoding P101, according to
P101 frame decoding P102 frame, and so on, until according to P158 frame decoding P159 frame.
Before above-mentioned steps 201, when receive put upside down instruct when, determine and start the position put upside down, that is, start to put upside down
Video frame determines target bit stream data after receiving and putting instruction upside down.The embodiment of the present invention determines object code according to following manner
Flow data:
According to instruction of putting upside down, the video frame for starting to put upside down is determined；Since the video frame for starting to put upside down, when according to video frame
Between sequence successively obtain video frame back to front, until get I frame stop obtain；The I frame that will acquire starts the view put upside down
Frequency frame and I frame and start the video frame between the video frame put upside down, together as the video frame of target bit stream data.
Wherein, if starting the last frame that the video frame put upside down is a GOP bit stream data, the object code fluxion obtained
According to for a complete GOP bit stream data；The P159-I2-P201-P202- ... for example, with I1-P101-P102 ...
For P259 ..., determine that the video frame for starting to put upside down is P159, then the target bit stream data obtained is I1-P101-
P102……P159。
If starting the intermediate frame that the video frame put upside down is a GOP bit stream data, the target bit stream data obtained is one
The video frame of first half in a GOP bit stream data；The P159-I2-P201- for example, with I1-P101-P102 ...
For P202- ... P259 ..., determine that the video frame for starting to put upside down is P249, then the target bit stream data obtained is I2-
P201-P202……P249。
Optionally, the embodiment of the present invention is after getting target bit stream data, the target bit stream data that will acquire according to
Video frame time forward direction is stored in the first buffer area；And the decoding picture for the video frame that decoding obtains is stored in the second caching
Area.
For example, as shown in Figure 3 stores target bit stream data to the method flow of the first buffer area, with video data
For I1-P101-P102 ... P159-I2-P201-P202- ... P259 ..., determine that the video frame for starting to put upside down is
P259, the target bit stream data of acquisition are I2-P201-P202 ...-P258-P259；First buffer area is buffer area A, then will
Data after target bit stream data is stored in buffer area A, in buffer area A are as follows: I2, P201, P202 ..., P258, P259.
It should be noted that the buffer area for storing target bit stream data is known as the first buffer area by the embodiment of the present invention, it will
The buffer area of storage decoding picture is known as the second buffer area.
In step 201, after getting target bit stream data from the first buffer area, target bit stream data is segmented
Processing, obtains multiple bit stream data sections.
By taking the target bit stream data stored in the first buffer area shown in Fig. 3 as an example, illustrate the embodiment of the present invention to target
The method of bit stream data progress segment processing.Wherein, m=10.
The target bit stream data stored in first buffer area A is I2-P201-P202 ...-P258-P259, according to every section
10 video frames carry out segment processing, then the target bit stream data after being segmented are as follows:
Paragraph 1: I2-P201-P202-P203-P204-P205-P206-P207-P208-P209；
2nd section: P210-P211-P212-P213-P214-P215-P216-P217-P218-P219；
3rd section: P220-P221-P222-P223-P224-P225-P226-P227-P228-P229；
4th section: P230-P231-P232-P233-P234-P235-P236-P237-P238-P239；
5th section: P240-P241-P242-P243-P244-P245-P246-P247-P248-P249；
6th section: P250-P251-P252-P253-P254-P255-P256-P257-P258-P259.
After the target bit stream data to the first buffer area carries out segment processing, since the I frame of target bit stream data, according to
The secondary target bit stream data to after segmentation is decoded.Since the bit stream data of the embodiment of the present invention is compiled using non-full I frame
Code mode is encoded, and wherein I frame can be decoded individually, without necessarily referring to other video frames；And for the P in bit stream data
Frame needs to refer to the decoding picture of the former frame of current P frame, according to the decoding picture of former frame, to current when being decoded
P frame is decoded.
It in step 202, after being successively decoded to the target bit stream data since I frame, is solved all
The obtained decoding picture of code is stored into the second buffer area, but by the first model in the multiple bit stream data sections obtained after segmentation
The decoding picture of the partial video frame in bit stream data section in enclosing is stored to the second buffer area, and by the code in the second range
The decoding picture of video frame is stored into the second buffer area some or all of in flow data section.
That is, the embodiment of the present invention for segmentation after target bit stream data, to the video frame in target bit stream data into
After row decoding, for the decoding picture that decoding obtains, there can be following processing mode:
1, the decoding picture of the partial video frame in each bit stream data section is stored in the second buffer area.
2, the decoding picture storage of the partial video frame in the bit stream data section in multiple bit stream data sections in the first range
To the second buffer area, and by the decoding picture of video frame some or all of in the bit stream data section in the second range store to
In second buffer area.
For above-mentioned processing mode 1, it is assumed that the target bit stream data after segmentation are as follows:
Paragraph 1: I2-P201-P202-P203-P204-P205-P206-P207-P208-P209；
2nd section: P210-P211-P212-P213-P214-P215-P216-P217-P218-P219；
3rd section: P220-P221-P222-P223-P224-P225-P226-P227-P228-P229；
4th section: P230-P231-P232-P233-P234-P235-P236-P237-P238-P239；
5th section: P240-P241-P242-P243-P244-P245-P246-P247-P248-P249；
6th section: P250-P251-P252-P253-P254-P255-P256-P257-P258-P259.
Then the decoding picture of the partial video frame in paragraph 1, the 2nd section, the 3rd section, the 4th section, the 5th section and the 6th section is stored
To the second buffer area.
It should be noted that for storing in every section to the partial video frame of the second buffer area, in the partial video frame
Include first video frame in this section.
For above-mentioned processing mode 2, it is assumed that the target bit stream data after segmentation are as follows:
Paragraph 1: I2-P201-P202-P203-P204-P205-P206-P207-P208-P209；
2nd section: P210-P211-P212-P213-P214-P215-P216-P217-P218-P219；
3rd section: P220-P221-P222-P223-P224-P225-P226-P227-P228-P229；
4th section: P230-P231-P232-P233-P234-P235-P236-P237-P238-P239；
5th section: P240-P241-P242-P243-P244-P245-P246-P247-P248-P249；
6th section: P250-P251-P252-P253-P254-P255-P256-P257-P258-P259.
It then can be by paragraph 1, the 2nd section, the 3rd section, the 4th section as the bit stream data section in the first range, by the 5th section and
6 sections as the bit stream data section in the second range；
The decoding picture of the partial video frame in paragraph 1, the 2nd section, the 3rd section, the 4th section is stored to the second buffer area；
The decoding picture of all videos frame in 5th section and the 6th section is stored to the second buffer area.
It should be noted that for storing in paragraph 1, the 2nd section, the 3rd section, the 4th section to the partial video of the second buffer area
Frame, comprising first video frame in this section in the partial video frame.
In order to maximally reduce the occupancy to the second buffer area, it is possible to reduce store the decoding into the second buffer area
The number of picture.
Optionally, by first video in the bit stream data section in the first range described in the multiple bit stream data section
The decoding picture of all videos frame in bit stream data section in the decoding picture of frame and second range is stored in caching
Area.
The embodiment of the present invention is for the bit stream data section in the first range in multiple bit stream data sections, only in the second buffer area
The decoding picture of first video frame in middle storage bit stream data section, in playing process, according to first in the bit stream data
The decoding picture of a video is decoded other video frames in the bit stream data section, obtains the decoding picture of other video frames.
For the bit stream data section in the second range in multiple bit stream data sections, due to being stored with this in the second buffer area
The decoding picture of all videos frame in bit stream data section, can directly play when putting upside down.
Optionally, the bit stream data section in the first range is all in addition to final stage in multiple bit stream data sections
Bit stream data section；Bit stream data section in second range is the bit stream data section of the final stage in multiple bit stream data sections.
Assuming that the target bit stream data after segmentation are as follows:
Paragraph 1: I2-P201-P202-P203-P204-P205-P206-P207-P208-P209；
2nd section: P210-P211-P212-P213-P214-P215-P216-P217-P218-P219；
3rd section: P220-P221-P222-P223-P224-P225-P226-P227-P228-P229；
4th section: P230-P231-P232-P233-P234-P235-P236-P237-P238-P239；
5th section: P240-P241-P242-P243-P244-P245-P246-P247-P248-P249；
6th section: P250-P251-P252-P253-P254-P255-P256-P257-P258-P259.
Then by paragraph 1, the 2nd section, the 3rd section, the 4th section and the 5th section as the bit stream data section in the first range；By the 6th section
As the bit stream data section in the second range；
The decoding picture of the partial video frame in paragraph 1, the 2nd section, the 3rd section, the 4th section and the 5th section is stored to second
Buffer area；The decoding picture of all videos frame in 6th section is stored to the second buffer area.
As preferred mode, the embodiment of the present invention is for the multiple bit stream data sections obtained after segmentation, by multiple code streams
The decoding picture of each video frame is stored into the second buffer area in final stage in data segment, and in addition to final stage
Except bit stream data section, only the decoding picture of first video frame in bit stream data section is stored to the second buffer area.
It, only will be first in each bit stream data section for the bit stream data section except final stage in decoding process
The decoding picture of video frame is stored in the second buffer area, for any one in addition to first video frame in bit stream data section
A video frame, after decoding obtains decoding picture, according to the decoding picture of the video frame, decoding obtains the decoding figure of next frame
Piece, and do not need for the decoding picture of the video frame to be stored in the second buffer area, but directly discharge.
For example, it is assumed that the target bit stream data after segmentation are as follows:
Paragraph 1: I2-P201-P202-P203-P204-P205-P206-P207-P208-P209；
2nd section: P210-P211-P212-P213-P214-P215-P216-P217-P218-P219；
3rd section: P220-P221-P222-P223-P224-P225-P226-P227-P228-P229；
4th section: P230-P231-P232-P233-P234-P235-P236-P237-P238-P239；
5th section: P240-P241-P242-P243-P244-P245-P246-P247-P248-P249；
6th section: P250-P251-P252-P253-P254-P255-P256-P257-P258-P259.
Since I2 frame, target bit stream data is successively decoded.Specifically, I2 is voluntarily decoded, by decoded solution
Code picture is stored in the second buffer area；For P201 frame, P201 frame is decoded according to the decoding picture of I2 frame, is solved
Code picture；Then P202 frame is decoded according to the decoding picture of P201 frame, it, will after the decoding picture for obtaining P202 frame
The decoding picture of P201 frame discharges；Successively using the above method to the data in first bit stream data section of the first buffer area into
Row decoding, after decoding obtains the decoding picture of P209, according to the decoding picture of P209, to the in second bit stream data section
One video frame P210 is decoded, and after decoding obtains the decoding picture of P210, discharges the decoding picture of P209, and by P210
Decoding picture be stored in the second buffer area.Similarly, to second, third, the 4th, the 5th in the first buffer area
Video frame in bit stream data section is all made of the above method and is decoded.For the 6th bit stream data section, due to being the code stream
The final stage bit stream data section of data, needs the decoding picture by each of final stage bit stream data section video frame equal
It is stored in during the second caching goes.After then being decoded to target bit stream data, as shown in figure 4, being stored with decoding figure in the second buffer area
The video frame of piece are as follows: I2, P210, P220, P230, P240, P250, P251, P252, P253, P254, P255, P256, P257,
P258、P259。
The embodiment of the present invention will need to store to the decoding picture preservation of the second buffer area, inversely show and discharge
The decoding picture stored in the buffer area.
Since the decoding picture of the final stage of target bit stream data of the embodiment of the present invention is all stored in the second buffer area
In, therefore, the decoding picture of the final stage of target bit stream data can directly be put upside down.It is continuous in order to guarantee to put upside down
Property, during the decoding picture for final stage of putting upside down, need to not stored in the bit stream data section in addition to final stage
The video frame of decoding picture is decoded.
Optionally, during showing and discharging decoding picture, according to stored first in same bit stream data section
The decoding picture of a video frame is decoded video frame not stored in the bit stream data section；It will decode described in obtaining
The decoding picture of not stored video frame is stored into buffer area.
It should be noted that during putting upside down, being shown being played to decoding picture to save the space of the second buffer area
Afterwards, which can be discharged.
For example, being stored with all videos frame in the bit stream data section of final stage in the second buffer area of the embodiment of the present invention
Decoding picture the decoding picture of the video frame stored in the second buffer area is directly subjected to Reverse Play after starting to put upside down,
Decoding picture after the display, can be discharged.During playing the decoding picture of final stage, in final stage of putting upside down
Decoding picture during, according to the decoding picture of first video frame of penultimate bit stream data section, decode down
The decoding picture of other video frames in second bit stream data section of number, and be stored in the second buffer area.Likewise, falling
The video frame of second bit stream data section of number is all after the completion of decoding, then to the video frame in third last bit stream data section into
Row decoding, until the video frame of first bit stream data section in the target bit stream data also decodes completion.
It should be noted that release first is slow after being all decoded the target bit stream data in the first buffer area
Deposit the target bit stream data stored in area.A GOP bit stream data before target bit stream data is obtained at this time, and is stored in the
In one buffer area.
In above-mentioned steps 201, the target bit stream data cached in the first buffer area is subjected to segment processing, is obtained multiple
Bit stream data section, wherein the video frame number in every section is m.
The embodiment of the present invention needs to predefine the video frame for including in every section before to the segmentation of target bit stream data
The value of number m.The embodiment of the present invention determines m value according to following manner:
Optionally, view can be decoded according to the number of video frame in a GOP bit stream data and in a GOP time
The maximum number of frequency frame determines the m value.
It should be noted that the number of video frame is fixed value in GOP bit stream data；It can be decoded in one GOP time
The maximum number of video frame is the fixed value determined according to machine capability.
Below with reference to mathematical formulae the present invention will be described in detail method that embodiment determines m value.
The embodiment of the present invention needs to consider two factors when determining m value: 1, a GOP bit stream data is accounted in decoding
Cache bank memories；2, the number of decoding video frame is needed in the GOP time.
Since the embodiment of the present invention is directed to a GOP bit stream data, the decoding picture for the video frame that buffer area needs to store
It include: the decoding picture of all video frames of final stage, total m is a；First view in addition to final stage in other every section
The decoding picture of frequency frame, altogetherIt is a.The number of the decoding picture for the video frame that then the second buffer area needs to store
The embodiment of the present invention determine need decoded video frame number in the GOP time when, due in a GOP bit stream data
The video frame decoding of final stage is primary, then it is m that final stage, which needs decoded video frame number,；Other in addition to final stage
The each video frame of section needs to decode twice, then the decoded video frame number of other sections needs isThen
It is B=2Gop+m that decoded video frame number is needed in the GOP time.
It being capable of decoded maximum video due to needing decoded video frame number to be not more than in a GOP time in the GOP time
Frame number N, i.e. 2Gop+m≤N, then the value range of m is m≤N-2GOP (1).
Since the embodiment of the present invention is intended to the number minimum so that the decoding picture for the video frame that the second buffer area needs to store,
I.e. in the value range of m, so thatIt is minimized.In conjunction with above-mentioned relationship (1) sum number
It learns relational expression (2), the method for available following determining m value:
Specifically, the embodiment of the present invention determines m value according to following manner:
IfWhen, then
IfThenWherein, the GOP is a GOP code stream number
According to the number of middle video frame, the N be in GOP time can decoded maximum video frame number,It indicates to be rounded downwards
Operation.
The embodiment of the present invention carries out segment processing to the target bit stream data in the first buffer area according to determining m value, presses
It is segmented according to the mode of every section of m video frame.It should be noted that in a GOP bit stream data video frame number Gop
When not being the multiple of m, the number of video frame is less than m in the final stage of the target bit stream data after segmentation.
Below with a specific embodiment, illustrate the method for video play-reverse of the embodiment of the present invention.
Assuming that a video data is I1-P102-P103 ... P140-I2-P202-P203 ... P240-I3-P302-
P303 ... P340 ... includes 40 frames in one of GOP bit stream data.After receiving and putting instruction upside down, the mesh that gets
Coding flow data is I3-P302-P303 ... P340.
Target bit stream data is stored in caching A for I3-P302-P303 ... P340 forward direction, and to the mesh in caching A
Coding flow data carries out segment processing.
It is assumed that view can be decoded according to the number 40 of video frame in a GOP bit stream data and in a GOP time
The maximum number of frequency frame, determining m value are 8, then target bit stream data are divided into 5 sections, be respectively as follows:
Paragraph 1: I3-P302-P303-P304-P305-P306-P307-P308；
2nd section: P309-P310-P311-P312-P313-P314-P315-P316；
3rd section: P317-P318-P319-P320-P321-P322-P323-P324；
4th section: P325-P326-P327-P328-P329-P330-P331-P332；
5th section: P333-P334-P335-P336-P337-P338-P339-P340.
Since I3 frame, to the target bit stream data carry out first time decoding, in decoding process, by paragraph 1, the 2nd section,
The decoding picture of first video frame is stored in caching B in 3rd section and the 4th segment encode flow data section, the decoding of other video frames
Picture abandons；The decoding picture of all videos frame in 5th segment encode flow data section is stored in caching B.Then solved in first time
After code, the decoding picture stored in B is cached are as follows: the picture of I3 frame, the picture of P309 frame, the picture of P317 frame, P325 frame
Picture, the picture of P333 frame, the picture of P334 frame, the picture of P335 frame, the picture of P336 frame, the picture of P337 frame, P338
The picture of frame, the picture of P339 frame, P340 frame picture.
Furthermore, it is desirable to illustrate, it at most can store 12 decoding pictures in the caching B of the embodiment of the present invention.
Decoding picture after the completion of decoding first time, in reverse display caching B.Due to being stored with object code in caching B
The decoding picture of the 5th section of all frames of flow data can completely put to the 5th section of all frame realizations upside down.
Since other sections in addition to the 5th section only have the decoding picture of first frame to be stored in caching B, it is putting upside down
Before the decoding picture of other sections in addition to the 5th section, need to decode this section according to the decoding picture of each section of first frame
In other video frames decoding picture.
Since the number of the decoding picture of caching of the embodiment of the present invention B video frame for needing to store is 12, for maximum limit
The memory that the reduction caching B of degree is occupied, then need sufficiently to be multiplexed the memory headroom of caching B.It is most in caching of embodiment of the present invention B
When the number of the decoding picture of storage is 12, in order to avoid the Caton phenomenon of video play-reverse, the every release one of the embodiment of the present invention
When the decoding picture of leading portion, the video frame of the last period is decoded, and decoded decoding picture is saved to second
Buffer area.
At this point it is possible to discharge the target bit stream data section stored in A is cached, and obtain next object code fluxion
According to and carry out segment processing.
That is, being shown first to the picture of P340 frame in the 5th section, after showing and discharging, caches in B and have more a picture
Space, P326 frame is decoded according to the decoding picture of P325 frame in the 4th section at this time.And so on, often discharge one
The decoding picture of 5th section of video frame decodes the decoding picture of a 4th section of video frame.
Similarly, during reverse the 4th section of display is the decoding picture of video frame, according to the 3rd section of first video
The decoding picture of frame is decoded other video frames.And so on, until the video frame of paragraph 1 is decoded completion.
During showing the decoding picture of paragraph 1, start to carry out first time decoding to next target bit stream data.
The embodiment of the present invention is directed to any one GOP bit stream data, and step can be used to putting upside down for GOP bit stream data
201~204 method.
As shown in figure 5, the overall flow figure of video play-reverse method of the embodiment of the present invention:
Step 501 obtains target bit stream data, wherein the target bit stream data is to start in a GOP bit stream data
Data between the video frame put upside down and I frame；
The target bit stream data is stored in the first buffer area by video frame time forward direction by step 502；
The target bit stream data for being stored in first buffer area is carried out segment processing by step 503, wherein every section
Including m video frame, m is positive integer；
Step 504 is successively decoded the target bit stream data since the I frame, and first every section is regarded
The decoding picture of all video frames of decoding picture and final stage of frequency frame is stored in the second buffer area；
Step 505 inversely shows and discharges the decoding picture stored in second buffer area；
Step 506, every release one work as the decoding picture of leading portion, determine that video frame time is near preceding in described the last period
Not decoded video frame；
Step 507, the decoding picture according to the former frame of the video frame, decode the decoding picture of the video frame, and
The decoding picture that decoding obtains is stored to second buffer area.
Based on the same inventive concept, a kind of device of video play-reverse is additionally provided in the embodiment of the present invention, due to the device
The principle solved the problems, such as is similar to the method for video play-reverse of the embodiment of the present invention, therefore the implementation of the device may refer to method
Implement, overlaps will not be repeated.
As shown in fig. 6, a kind of device of video play-reverse of the embodiment of the present invention, comprising:
Module 601 is obtained, the target bit stream data for will acquire carries out segment processing, multiple bit stream data sections are obtained,
Wherein the object code flow data is the data started between the video frame put upside down and I frame in a GOP bit stream data, every section of packet
M video frame is included, the m is positive integer；
Processing module 602, for being successively decoded to the target bit stream data since I frame, and will be the multiple
The decoding picture and the code in the second range of the partial video frame in bit stream data section in bit stream data section in the first range
The decoding picture of video frame is stored in buffer area some or all of in flow data section；
Playing module 603, for inversely showing and discharging the decoding picture stored in the buffer area；Wherein, it is showing
And during discharging decoding picture, not stored video frame is obtained according to stored decoding picture in same bit stream data section
Decoding picture, and store into buffer area.
Optionally, the processing module 602, is specifically used for:
By the solution of first video frame in the bit stream data section in the first range described in the multiple bit stream data section
The decoding picture of all videos frame in bit stream data section in code picture and second range is stored in buffer area.
Optionally, the bit stream data section in first range be the multiple bit stream data section in except final stage it
Outer all bit stream data sections；Bit stream data section in second range is the final stage in the multiple bit stream data section
Bit stream data section.
Optionally, the processing module 602, is specifically used for:
During showing and discharging decoding picture, according to first video frame stored in same bit stream data section
Decoding picture, video frame not stored in the bit stream data section is decoded；Decoding is obtained described not stored
The decoding picture of video frame is stored into buffer area.
Optionally, the acquisition module 601, is specifically used for:
The m value is determined according to following manner:
According to the number of video frame in a GOP bit stream data and in a GOP time can decoding video frame most
Big number determines the m value.
Optionally, the acquisition module 601, is specifically used for:
IfThen
IfThen
Wherein, the Gop is the number of video frame in a GOP bit stream data, and the N is can in a GOP time
The maximum number of decoding video frame,Expression rounds up operation.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of method of video play-reverse, which is characterized in that this method comprises:
The target bit stream data that will acquire carries out segment processing, multiple bit stream data sections is obtained, wherein the object code flow data
To start the data between the video frame put upside down and I frame in a picture group GOP bit stream data, every section includes m video frame, institute
Stating m is positive integer, and m≤N-2GOP, the GOP are the number of video frame in a GOP bit stream data, when the N is a GOP
In being capable of decoded maximum video frame number；
Successively the target bit stream data is decoded since I frame, and by the first range in the multiple bit stream data section
The decoding picture of partial video frame in interior bit stream data section and the part or complete in the bit stream data section in the second range
The decoding picture of portion's video frame is stored in buffer area；
Inversely shows and discharge the decoding picture stored in the buffer area；Wherein, in the process for showing and discharging decoding picture
In, the decoding picture of not stored video frame is obtained according to stored decoding picture in same bit stream data section, and store and arrive
In buffer area.
2. the method as described in claim 1, which is characterized in that it is described will be in the multiple bit stream data section in the first range
It is regarded some or all of in the decoding picture of partial video frame in bit stream data section and the bit stream data section in the second range
The decoding picture of frequency frame is stored in buffer area, comprising:
By the decoding figure of first video frame in the bit stream data section in the first range described in the multiple bit stream data section
The decoding picture of all videos frame in bit stream data section in piece and second range is stored in buffer area.
3. method according to claim 2, which is characterized in that the bit stream data section in first range is the multiple code
All bit stream data sections in addition to final stage in flow data section；Bit stream data section in second range is described more
Final stage bit stream data section in a bit stream data section.
4. method as claimed in claim 3, which is characterized in that it is described during showing and discharging decoding picture, according to
Stored decoding picture obtains the decoding picture of not stored video requency frame data in same bit stream data section, and stores to caching
Qu Zhong, comprising:
During showing and discharging decoding picture, according to the solution of first video frame stored in same bit stream data section
Code picture, is decoded video frame not stored in the bit stream data section；
The decoding picture for the not stored video frame that decoding is obtained is stored into buffer area.
5. the method as described in claim 1, which is characterized in that determine the m value according to following manner:
It is capable of the maximum of decoding video frame according to the number of video frame in a GOP bit stream data and in a GOP time
Number, determines the m value.
6. method as claimed in claim 5, which is characterized in that the number according to video frame in a GOP bit stream data,
And it is capable of the maximum number of decoding video frame in a GOP time, determine the m value, comprising:
IfWhen, then
IfThen
Wherein, the GOP is the number of video frame in a GOP bit stream data, and the N is that can decode in a GOP time
The maximum number of video frame,Indicate downward floor operation.
7. a kind of device of video play-reverse characterized by comprising
Module is obtained, the target bit stream data for will acquire carries out segment processing, multiple bit stream data sections is obtained, wherein described
Target bit stream data is the data started between the video frame put upside down and I frame in a picture group GOP bit stream data, and every section includes
M video frame, the m are positive integer, and m≤N-2GOP, the GOP are the number of video frame in a GOP bit stream data, described
N is being capable of decoded maximum video frame number in a GOP time；
Processing module, for being successively decoded to the target bit stream data since I frame, and by the multiple bit stream data
The decoding picture of the partial video frame in bit stream data section in section in the first range and the bit stream data section in the second range
In some or all of the decoding picture of video frame be stored in buffer area；
Playing module, for inversely showing and discharging the decoding picture stored in the buffer area；Wherein, it is showing and is discharging solution
During code picture, the decoding figure of not stored video frame is obtained according to stored decoding picture in same bit stream data section
Piece, and store into buffer area.
8. device as claimed in claim 7, which is characterized in that the processing module is specifically used for:
By the decoding figure of first video frame in the bit stream data section in the first range described in the multiple bit stream data section
The decoding picture of all videos frame in bit stream data section in piece and second range is stored in buffer area.
9. device as claimed in claim 8, which is characterized in that the bit stream data section in first range is the multiple code
All bit stream data sections in addition to final stage in flow data section；Bit stream data section in second range is described more
Final stage bit stream data section in a bit stream data section.
10. device as claimed in claim 9, which is characterized in that the processing module is specifically used for:
During showing and discharging decoding picture, according to the solution of first video frame stored in same bit stream data section
Code picture, is decoded video frame not stored in the bit stream data section；The not stored video that decoding is obtained
The decoding picture of frame is stored into buffer area.
11. device as claimed in claim 7, which is characterized in that the acquisition module is specifically used for:
The m value is determined according to following manner:
It is capable of the maximum of decoding video frame according to the number of video frame in a GOP bit stream data and in a GOP time
Number, determines the m value.
12. device as claimed in claim 11, which is characterized in that the acquisition module is specifically used for:
IfWhen, then
IfThen
Wherein, the GOP is the number of video frame in a GOP bit stream data, and the N is that can decode in a GOP time
The maximum number of video frame,Indicate downward floor operation.
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| CN109005447A (en) * | 2018-08-10 | 2018-12-14 | 高新兴科技集团股份有限公司 | A kind of video recording of security protection high definition falls broadcasting method and device |
| CN111372117B (en) * | 2018-12-25 | 2023-06-23 | 浙江大华技术股份有限公司 | Video playing method and device, electronic equipment and storage medium |
| CN111372118A (en) * | 2018-12-25 | 2020-07-03 | 深圳Tcl新技术有限公司 | Screen capturing method, intelligent terminal and storage medium |
| CN109889895A (en) * | 2019-03-13 | 2019-06-14 | 浙江大华技术股份有限公司 | Video broadcasting method, device, storage medium and electronic device |
| CN111866549B (en) * | 2019-04-29 | 2023-03-24 | 腾讯科技（深圳）有限公司 | Video processing method and device, terminal and storage medium |
| CN111866574A (en) * | 2019-04-29 | 2020-10-30 | 浙江开奇科技有限公司 | Real-time reverse playing method for mobile end streaming media |
| CN110856034A (en) * | 2019-11-25 | 2020-02-28 | 西安奥卡云数据科技有限公司 | Video file caching method and system |
| CN111447486A (en) * | 2020-04-07 | 2020-07-24 | 上海熙菱信息技术有限公司 | Reverse playing method for forward pushing of historical code stream |
| CN112019856A (en) * | 2020-08-27 | 2020-12-01 | 上海七牛信息技术有限公司 | Video reversing method and system for smart phone |
| CN113015003B (en) * | 2021-03-08 | 2022-11-25 | 展讯通信（上海）有限公司 | Video frame caching method and device |
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