CN105812914A - Mixed multiplex decoding method and device of video - Google Patents
Mixed multiplex decoding method and device of video Download PDFInfo
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Abstract
The present invention discloses a mixed multiplex decoding method and device of a video. The method comprises the steps of (A) analyzing each video to obtain a corresponding video frame, (B) carrying out frame decoding scheduling on all video frames, selecting a video whose frame data is played fastest, and transmitting the video to the decoder to carry out optimal decoding, (C) storing the frame data obtained after decoding to the buffer corresponding to each video, and outputting a corresponding frame data from the buffers to play. According to the mixed multiplex decoding method and device, the decoder resource is fully utilized through the frame decoding scheduling, a problem that a decoder can not decode two or more videos at the same time at present is solved, and the normal playing of each video at the same time and no frame jam are ensured.
Description
Technical field
The present invention relates to video decoding techniques field, particularly to mixed multiplex coding/decoding method and the device of a kind of video.
Background technology
The efficiency of hardware decoder is generally higher than the software decode efficiency under the same terms.In a lot of situations, only one of which hardware decoder in actual decoding platforms, namely may only decode a road video within the same time, and the decoding of a road video only consumes the decoder resources of part.In actual applications, often occur decoding multi-channel video simultaneously and presenting to the situation of user, when only one of which hardware decoder, need to enable software decode during the decoding of plural video.As it is shown in figure 1, existing hardware decoded video streams journey is mainly: obtain, resolve, decode, export.Particularly as follows: first obtained a video file by media player, then video file is resolved to isolate voice data and video data by separator, audio decoder exports after voice data is decoded and plays to loudspeaker, meanwhile, Video Decoder shows to display screen exporting after video data decoding.When needing second video file of decoding, it is necessary to stop the decoding of first video file, decode second video file according to the flow process of Fig. 1.
This mode simultaneously cannot decode two or more videos by hardware, adopt hardware decoding and software decode and mode decode multiple video, software decode can consume a large amount of system resource, and owing to system resource restriction also cannot decode the video of high definition.
Thus prior art need to improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, it is an object of the invention to provide the mixed multiplex coding/decoding method of a kind of video and device, to solve the problem that an existing decoder can not decode two or more video simultaneously.
In order to achieve the above object, this invention takes techniques below scheme:
A kind of mixed multiplex coding/decoding method of video, comprising:
A, carry out each video resolving and obtain corresponding frame of video；
B, all frame of video are carried out frame decoding scheduling, select a transmission of video that frame data finish the soonest preferentially to decode to decoder；
C, the frame data that obtain after decoding are stored in the buffer that each video is corresponding, from buffer, export corresponding frame data play out.
In the mixed multiplex coding/decoding method of described video, described step C also includes: the frame information in buffer is added up, and obtains the decoded information dispatching foundation as frame decoding.
In the mixed multiplex coding/decoding method of described video, described decoded information includes the storage state of each video decoding posterior bumper, the decoding time of current video frame, the frame per second of each video.
In the mixed multiplex coding/decoding method of described video, described step B specifically includes:
B1, by be currently needed for decoding frame of video be defaulted as last time decoding frame of video；
B2, add up playable time of each decoded frame, reject the video that reproduction time is the shortest；
B3, according to decoded information judge whether to decoding video whether meet decoding condition；It is then perform step B4；Otherwise return step B2；
B4, will the video frame transmission of this video to decoder be decoded；
B5, video collection is reverted to the video collection containing all videos, and using the video that this decoded video decoded as last time, return step B1.
In the mixed multiplex coding/decoding method of described video, described step B3 specifically includes:
B31, judge whether to the frame data that whether there are storage new decoding in space in the buffer corresponding to frame of video of decoding: if having, perform step B32；Otherwise, B33 is performed；
B32, judge whether to decoding video in whether have be available for decoding frame of video: if having, perform step B34；Otherwise, B33 is performed；
B33, the video decoded as needs by video the shortest for reproduction time, return step B2；
B34, judge whether to the average decoding time of a frame that the video of decoding will decode whether less than the video of the playable minimal time of decoded frame: if so, then perform step B4；Otherwise, B33 is performed.
In the mixed multiplex coding/decoding method of described video, specifically include at described step B4: export the frame of video of this video to decoder, it is judged that need the video of decoding with whether the video of decoding last time is same video: if so, then to decode；If it is not, after form change the arranging of decoder of the video then decoded as required, further decoding.
A kind of device of the mixed multiplex coding/decoding method adopting described video, comprising:
Parsing module, obtains corresponding frame of video for carrying out each video resolving；
Decoder module, for all frame of video are carried out frame decoding scheduling, selects a video that frame data finish the soonest preferentially to decode；
Buffer module, for the frame data obtained after storing decoding, and the frame data exporting correspondence play out.
In described device, described decoder module includes:
Initialization unit, for being defaulted as the frame of video of decoding last time by the frame of video being currently needed for decoding；
Statistic unit, for adding up the playable time of each decoded frame, rejects the video that reproduction time is the shortest；
Judging unit, whether the video for judging whether to decoding according to decoded information meets decoding condition, when satisfied decoding condition by the video frame transmission of this video to decoder；
Decoder, for frame of video is decoded, and reverts to the video collection containing all videos by video collection, and using video that this decoded video decoded as last time.
In described device, described decoder is additionally operable to the frame information in buffer is added up, and obtains the decoded information dispatching foundation as frame decoding.
In described device, described parsing module includes multiple separator, and buffer module includes multiple buffer；Described separator, the number of buffer are mated with the number of video.
Compared to prior art, the mixed multiplex coding/decoding method of video provided by the invention and device, corresponding frame of video is obtained by carrying out each video resolving, all frame of video are carried out frame decoding scheduling, a transmission of video that frame data finish the soonest is selected preferentially to decode to decoder, the frame data obtained after decoding are stored in the buffer that each video is corresponding, the frame data exporting correspondence from buffer play out, decoder resources is taken full advantage of by frame decoding scheduling, solve the problem that an existing decoder can not decode two or more video simultaneously；Ensure that each video can simultaneously normal play and do not have card frame.
Accompanying drawing explanation
Fig. 1 is existing hardware decoded video streams journey figure.
The mixed multiplex coding/decoding method flow chart of the video that Fig. 2 provides for present pre-ferred embodiments.
The mixed multiplex coding/decoding method schematic diagram of the video that Fig. 3 provides for present pre-ferred embodiments.
Fig. 4 is the flow chart of step S200 in Fig. 3.
The structured flowchart of the device that Fig. 5 provides for present pre-ferred embodiments.
Detailed description of the invention
The present invention provides mixed multiplex coding/decoding method and the device of a kind of video, it is mainly used in plural video to decode simultaneously, the video selecting current preference to decode is dispatched by frame decoding, the decoded information selection gist as frame decoding scheduling next time of each video is added up after decoding, make full use of decoder resources, it is ensured that each video can simultaneously normal play and the problem that do not have card frame.For making the purpose of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 2, it is the mixed multiplex coding/decoding method flow chart of video provided by the invention；Described mixed multiplex coding/decoding method includes:
S100, carry out each video resolving and obtain corresponding frame of video；
S200, all frame of video are carried out frame decoding scheduling, select a video that frame data finish the soonest preferentially to decode；
S300, the frame data that obtain after decoding are stored in the buffer that each video is corresponding, from buffer, export corresponding frame data play out.
As shown in Figure 3, it is assumed that have n video, i.e. video1 ~ videon to need to decode, each video is respectively arranged with independent demux module to resolve the video data of each frame of each video, and the frame of video after parsing is videoframe1 ~ videoframen simultaneously.The frame of video of each video is dispatched by frame decoding and is therefrom selected a frame of video (only one) preferentially to decode.Decoded frame data store in the buffer that each video is corresponding, and the frame data such as video1 store to buffer 1, and the frame data of videon store to buffer n.The last frame data exporting correspondence from buffer carry out video playback.
It is likely to difference based on the form (such as RMVB, MKV, MP4) needing the video play, before decoder decoding, decoder can be set according to the form of the frame of video of output, decoder is configured to the type of decoder required during the decoding of this video, to decode the video of this kind of form.Such video1 needs to carry out video1 decoding configuration, and videon carries out videon decoding configuration.
It is to be appreciated that play with multiple videos simultaneously, it is all acquisition played data from buffer during these video playback.If in buffer, the frame data of certain video will be play and terminate, and now not store new frame data, then this video council card falls.Therefore, for multiple videos in the case ofs of playing simultaneously, when the present embodiment carries out frame decoding scheduling, select with a video (namely frame data finish the soonest) of the playable shortest time of decoded frame for benchmark, in other words, the video of preferential decoding is the video that frame data finish the soonest, and the longer video of other reproduction times can decode after a while, is so just avoided that video card falls.
For this, the present embodiment carry out frame decoding scheduling time, according to the decoded information of decoder to send into decoder each frame of video select.Described decoded information is after a frame data storage, by decoder, the frame information in buffer is added up, it includes storage state (the i.e. number of frames of storage after this decoding of each video decoding posterior bumper, and buffer also storable number of frames), the decoding time of current video frame, the frame per second etc. of each video.
Please refer to Fig. 4, the scheduling of described frame decoding includes:
S210, by be currently needed for decoding frame of video be defaulted as last time decoding frame of video.
Being required for configuration decoder during based on decoding every time, during decoding, first the tentative video to decoding last time is decoded again, so can reduce the switching frequency of decoder configuration, improve decoding efficiency.Follow-up continue to judge that whether this video is best decoding selection further according to frame data reproduction time.
S220, add up playable time of each decoded frame, reject the video that reproduction time is the shortest.
S230, according to decoded information judge whether to decoding video whether meet decoding condition；It is then perform step S240；Otherwise return step S220.
In the present embodiment, described decoding condition includes: 1, must have the frame data of enough space storage new decodings in buffer；2, this video must have the frame of video (in other words also having the frame data not decoded) being available for decoding；3, the average decoding time of the frame that this video will decode is necessarily less than a video of the playable minimal time of decoded frame.These three condition must be satisfied by just execution step S240, and any of which is unsatisfactory for all return step S220.
S240, will the video frame transmission of this video to decoder be decoded.
In the present embodiment, although the video in the decoding of step S210 prioritizing selection is the video of decoding last time, but after being judged by above-mentioned steps, what be likely to final selection is not the video of decoding last time, then needing arranging of decoder of change just can be correctly decoded, for this, described step S240 specifically includes: export the frame of video of this video to decoder, judge whether to the video of decoding with whether the video of decoding last time is same video: if so, then decode；If it is not, after form change the arranging of decoder of the video then decoded as required, further decoding.
S250, video collection is reverted to the video collection containing all videos, and using the video that this decoded video decoded as last time, return step S210.
After this has decoded, also need to continue all of video is judged again, by video collection being reverted to the video collection containing all videos, the video that this decoded video was decoded as last time, return step S210 and again select a video needing decoding next time from video collection, until all videos all complete decoding and just terminate whole mixed multiplex coding/decoding method.For this, after described step S240, also include: judge whether all videos finish, if then terminating, otherwise perform step S250.
In the present embodiment, described step S230 specifically includes:
Step 2301, judge whether to the frame data that whether there are storage new decoding in space in the buffer corresponding to frame of video of decoding: if having, perform step 2302；Otherwise, step 2303 is performed.
This buffer outputs most frame data and has just had the frame data of space storage new decoding, illustrated that this video will finish, it is necessary to judge whether this video can decode by subsequent step.If without space, illustrate this buffer also has a lot of frame data, enough play before decoding next time, temporarily can not decode this video.
Step 2302, judge whether to decoding video in whether have be available for decoding frame of video: if having, perform step 2303；Otherwise, step 2303 is performed.
Along with the decoding of video, its video requency frame data being available for decoding can be gradually reduced until not having, then this video has decoded.This step is used for judging whether this video has decoded.
Step 2303, the video decoded as needs by video the shortest for reproduction time, return step S220.
Step 2304, judge whether to the average decoding time of a frame that the video of decoding will decode whether less than the video of the playable minimal time of decoded frame: if so, then perform step S240；Otherwise, step 2303 is performed.
Assume that this Application Example has three videos: video 1, video 2, video 3；Each parameter of these three video is defined respectively as:
Fn: the n-th video frame rate.Assume F1=25, F2=30, F3=24.
The playable time of the Tn: the n-th video decoded frame.Tn=the n-th video has decoded the frame of video number/Fn not yet exported.Assume T1=80 millisecond, F2=99 millisecond, F3=82 millisecond.
Average time needed for Tnk: the n-th video k frame decoding；Wherein k is: I, B, P frame.The k type frame number of k type frame required time summation decoded for Tnk=/decoded.Needed for assuming the B frame decoding of above three video, average time distinguishes T1B=10 millisecond, T2B=15 millisecond, T3B=13 millisecond.
The decoding frame number of all right buffer memory of the Nn: the n-th video；N1=1, N2=3, N3=2.
N1: the video that will decode.
N2 a: video of last decoding.
N3: decoded frame can the shortest video of reproduction time.
Assuming that video 1 has decodable code data, video 2 not to have decodable code data, video 3 has decodable code data.
The step of the Application Example of described step S200 specifically includes:
When step 1, decoder first time decodes, the video initialization decoded the last time is 1.I.e. n2=1.
Step 2, the video that will decode are defaulted as the video n1=n2 of last decoding.Purpose is a video of preferentially decoding decoding last time, to reduce the switching frequency of decoder configuration, improves decoding efficiency.
Playable minimum for time Tn one of each decoded frame in step 3, statistics video collection, is labeled as Tn3, and video is the n-th 3.I.e. Tn3=80ms, n3=1.
Step 4, from each video collection, reject the n-th 3(n3=1) individual, do not calculate the n-th 3 during statistics next time.Namely rejecting rear video set is: video 2 and video 3.
Step 5, judge the n-th 1(n1=1) the decoding frame (frame data) that whether has space can deposit new decoding in the buffer of individual video decoded frame, if it did not, make n1=n3, return step 3；If it has, then perform step 6.In the present embodiment, n1=1 illustrates there is the space that can deposit new decoding frame.
Step 6, judge n1 (n1=1) individual video whether have be available for decoding video requency frame data；If it did not, make n1=n3, return step 3；If it has, perform step 7.In the present embodiment, video 1 has decodable code data.
Step 7, judge the n-th 1(n1=1) whether the average decoding time of a frame that will decode of individual video less than Tn3；If it is not, make n1=n3, return step 3；If it is lower, perform step 8.In the present embodiment, T1B=10ms is less than the 80ms of T1；
Step 8, judge the n-th 1(n1=2) whether individual video and decoder decoding video last time (n2=1) be same (for same in this example)；If so, step 9 is performed；Step 9 is performed if it is not, change after decoder is configured to the n-th 1 configurations.
Step 9, decode frame n-th 1(n1=1) individual video, and calculate the time needed for the n-th 1 videos of decoding one frame, each video buffer deposited after statistical decoder number of frames and also can deposit number of frames, having fed back as decoded information.
Step 10, judging whether all videos finish, if then terminating, otherwise performing step 11.
Step 11, video is decoded set revert to and comprise all videos, and by n1=1 in this example of n2=n1(, so place n2=1), for decoding judgement next time；Return step 2.
Mixed multiplex coding/decoding method based on above-mentioned video, the present invention correspondingly provides the device of a kind of mixed multiplex coding/decoding method realizing video, see also Fig. 5, described device includes parsing module 10, decoder module 20 and buffer 30, and described parsing module 10, decoder module 20, buffer 30 are sequentially connected with.Each video is carried out resolving the frame of video obtaining correspondence by parsing module 10；All frame of video are carried out frame decoding scheduling by decoder module 20, select a video that frame data finish the soonest preferentially to decode；Buffer 30 stores the frame data obtained after decoding, and the frame data exporting correspondence play out.
Described decoder module 20 includes:
Initialization unit 210, for being defaulted as the frame of video of decoding last time by the frame of video being currently needed for decoding；
Statistic unit 220, for adding up the playable time of each decoded frame, rejects the video that reproduction time is the shortest；
Judging unit 230, whether the video for judging whether to decoding according to decoded information meets decoding condition, when satisfied decoding condition by the video frame transmission of this video to decoder；Specific embodiment is such as shown in above-mentioned steps S230.
Decoder 240, for frame of video is decoded, and reverts to the video collection containing all videos by video collection, and using video that this decoded video decoded as last time；
Described initialization unit 210, statistic unit 220, judging unit 230, decoder 240 are sequentially connected with, and described initialization unit 210 connects parsing module 10 and decoder 240, and described decoder 240 connects buffer module 30.
In the present embodiment, described parsing module 10 includes multiple separator (demux), and buffer module 30 includes multiple buffer；Each video is correspondingly arranged a separator and a buffer respectively.
In sum, the present invention obtains corresponding frame of video by carrying out each video resolving；Adopting the video that frame decoding scheduling selects current preference to decode, store in the buffer that each video is corresponding by the frame data obtained after decoding, the frame data exporting correspondence from buffer play out；Further, the decoded information selection gist as frame decoding scheduling next time of each video is added up after the decoding；Adopt frame decoding scheduling can make full use of decoder resources, solve the problem that an existing decoder can not decode two or more video simultaneously；Ensure that each video can simultaneously normal play and do not have card frame.
It is understood that for those of ordinary skills, replacement can be equal to according to technical scheme and inventive concept thereof or be changed, and all these are changed or replace the scope of the claims that all should belong to appended by the present invention.
Claims (10)
1. the mixed multiplex coding/decoding method of a video, it is characterised in that including:
A, carry out each video resolving and obtain corresponding frame of video；
B, all frame of video are carried out frame decoding scheduling, select a transmission of video that frame data finish the soonest preferentially to decode to decoder；
C, the frame data that obtain after decoding are stored in the buffer that each video is corresponding, from buffer, export corresponding frame data play out.
2. the mixed multiplex coding/decoding method of video according to claim 1, it is characterised in that described step C also includes: the frame information in buffer is added up, obtains the decoded information dispatching foundation as frame decoding.
3. the mixed multiplex coding/decoding method of video according to claim 2, it is characterised in that described decoded information includes the storage state of each video decoding posterior bumper, the decoding time of current video frame, the frame per second of each video.
4. the mixed multiplex coding/decoding method of video according to claim 2, it is characterised in that described step B specifically includes:
B1, by be currently needed for decoding frame of video be defaulted as last time decoding frame of video；
B2, add up playable time of each decoded frame, reject the video that reproduction time is the shortest；
B3, according to decoded information judge whether to decoding video whether meet decoding condition；It is then perform step B4；Otherwise return step B2；
B4, will the video frame transmission of this video to decoder be decoded；
B5, video collection is reverted to the video collection containing all videos, and using the video that this decoded video decoded as last time, return step B1.
5. the mixed multiplex coding/decoding method of video according to claim 4, it is characterised in that described step B3 specifically includes:
B31, judge whether to the frame data that whether there are storage new decoding in space in the buffer corresponding to frame of video of decoding: if having, perform step B32；Otherwise, B33 is performed；
B32, judge whether to decoding video in whether have be available for decoding frame of video: if having, perform step B34；Otherwise, B33 is performed；
B33, the video decoded as needs by video the shortest for reproduction time, return step B2；
B34, judge whether to the average decoding time of a frame that the video of decoding will decode whether less than the video of the playable minimal time of decoded frame: if so, then perform step B4；Otherwise, B33 is performed.
6. the mixed multiplex coding/decoding method of video according to claim 5, it is characterized in that, specifically include at described step B4: export the frame of video of this video to decoder, it is judged that need the video of decoding with whether the video of decoding last time is same video: if so, then to decode；If it is not, after form change the arranging of decoder of the video then decoded as required, further decoding.
7. the device of the mixed multiplex coding/decoding method of the video adopted described in claim 1, it is characterised in that including:
Parsing module, obtains corresponding frame of video for carrying out each video resolving；
Decoder module, for all frame of video are carried out frame decoding scheduling, selects a video that frame data finish the soonest preferentially to decode；
Buffer module, for the frame data obtained after storing decoding, and the frame data exporting correspondence play out.
8. device according to claim 7, it is characterised in that described decoder module includes:
Initialization unit, for being defaulted as the frame of video of decoding last time by the frame of video being currently needed for decoding；
Statistic unit, for adding up the playable time of each decoded frame, rejects the video that reproduction time is the shortest；
Judging unit, whether the video for judging whether to decoding according to decoded information meets decoding condition, when satisfied decoding condition by the video frame transmission of this video to decoder；
Decoder, for frame of video is decoded, and reverts to the video collection containing all videos by video collection, and using video that this decoded video decoded as last time.
9. device according to claim 8, it is characterised in that described decoder is additionally operable to the frame information in buffer is added up, obtains the decoded information dispatching foundation as frame decoding.
10. device according to claim 7, it is characterised in that described parsing module includes multiple separator, buffer module includes multiple buffer；Described separator, the number of buffer are mated with the number of video.
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