CN103139559B - Multi-media signal transmission method and device - Google Patents
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Abstract
The invention discloses a kind of multi-media signal transmission method and device.Wherein, the method comprises encodes to multi-media signal waiting for transmission, forms coded audio data, video Primary layer coded data and video source modeling layer coded data; Encode audio data, video Primary layer coded data and video source modeling layer coded data encapsulate respectively; User bandwidth according to feedback determines content waiting for transmission, and from the data after encapsulation, selects coded data waiting for transmission according to content waiting for transmission; According to the user bandwidth of feedback and the insertion position of user's packet loss determination forward error correction data, and forward error correction data is inserted in the coded data of relevant position; When comprising video source modeling layer coded data in coded data waiting for transmission, transmit various coded data in proportion according to transmission time.The present invention ensures that under network jitter and packet drop video base layer data preferentially arrives user side, and during guarantee order video, anti-network jitter ability reaches the strongest.
Description
Technical field
The present invention relates to mobile internet technical field, especially, relate to a kind of multi-media signal transmission method and device.
Background technology
Along with popularizing of mobile Internet application, the covering of 3G network constantly expands and popularizes, and the traffic carrying capacity of mobile video is also in continuous expansion.Mobile phone is utilized to watch video one of major function becoming mobile phone at present, but it is still wide not that the disadvantage of movement is exactly bandwidth, and often there is the problem of suspension or poor signal, in broadcasting, easily cause video hiccups like this, and video hiccups is the major reason affecting customer experience.
Current mobile Internet uses many video encapsulation forms to be the encapsulation standard of 3GP, the many employings of video compression agreement H.264.Video server is that some adopts Web server with streaming media server a bit.Terminal generally can create a certain size buffering in inside deals with the unsteadiness of mobile network, but also can only solve the jitter problem of part, so there is SVC (ScaledVideoCoding at present, can layered video encoding and decoding) algorithm, a code stream can comprise different resolution and frame per second, the data of adequate resolution and frame per second can be sent according to the bandwidth situation of user, this coding method brings good solution to mobile video business, if but by original pattern in the transmission design of server and on Document encapsulation, just upgrade a set of coding method, the real effect that this coding method plays is unsatisfactory, suddenly interrupt or when signal difference, have break equally occurring at network.
Summary of the invention
The technical problem that the present invention will solve is to provide a kind of multi-media signal transmission method and device, can improve the anti-network jitter ability of video when user's order video.
According to an aspect of the present invention, propose a kind of multi-media signal transmission method, comprise and multi-media signal waiting for transmission is encoded, form coded audio data, video Primary layer coded data and video source modeling layer coded data; Encode audio data, video Primary layer coded data and video source modeling layer coded data encapsulate respectively; User bandwidth according to feedback determines content waiting for transmission, and from the data after encapsulation, selects coded data waiting for transmission according to determined content waiting for transmission; According to the user bandwidth of feedback and the insertion position of user's packet loss determination forward error correction data, and forward error correction data is inserted in the coded data of relevant position; When comprising video source modeling layer coded data in coded data waiting for transmission, transmit various coded data in proportion according to transmission time.
According to a further aspect in the invention, also proposed a kind of multimedia signal transmission device, comprise coding unit, for encoding to multi-media signal waiting for transmission, forming coded audio data, video Primary layer coded data and video source modeling layer coded data; Encapsulation unit, is connected with coding unit, for encode audio data, video Primary layer coded data and video source modeling layer coded data encapsulate respectively; Data selecting unit, is connected with encapsulation unit, for determining content waiting for transmission according to the user bandwidth of feedback, and from the data after encapsulation, selects coded data waiting for transmission according to determined content waiting for transmission; Error correction plug-in unit, is connected with data selecting unit, for the insertion position according to the user bandwidth fed back and user's packet loss determination forward error correction data, and is inserted in the coded data of relevant position by forward error correction data; Ratio-dependent unit, is connected with error correction plug-in unit, for comprising video source modeling layer coded data in coded data waiting for transmission, transmits various coded data in proportion according to transmission time.
Multi-media signal transmission method provided by the invention and device, give full play to the characteristic of SVC, according to the layering feature of SVC, the encapsulation of file, transmission means and mechanism for correcting errors are improved, under network jitter and packet drop, ensure that video base layer data preferentially arrives user side and enables mechanism for correcting errors, during guarantee order video, anti-network jitter ability reaches the strongest, and then makes the experience of user reach optimization.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of an embodiment of multi-media signal transmission method of the present invention.
Fig. 2 is Movie container schematic diagram.
Fig. 3 is the structural representation of an embodiment of multimedia signal transmission device of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Exemplary embodiment of the present invention and explanation thereof for explaining the present invention, but do not form inappropriate limitation of the present invention.
Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.
Following embodiment of the present invention encapsulates the method for packing proposing oneself in not standardized situation at SVC, namely, in Document encapsulation, increase independently that video segmentation track is (such as, video Primary layer track, video source modeling layer track), respectively each video segmentation track is encapsulated independently.In the process of video server to terminal transmission multi-media signal, take to regenerate corresponding media file according to the real-time download bandwidth of client feeds back, namely, again disassemble file and encapsulate, video base layer data and the optimum organization of video source modeling layer data are become to be applicable to the media file of current bandwidth, and the download bandwidth situation according to user decides FEC (Forwarderrorcorrection, forward error correction) position that adds of data, when packet loss is comparatively serious and download bandwidth can meet the bandwidth requirement of video base layer data, FEC data can be added in base layer data.In transmitting procedure, can control respectively according to the transmission rate of Information Pull adaptive algorithm to Primary layer and enhancement layer of user feedback, such as, in the video playback incipient stage, first send base layer data to terminal, the object starting fast and play can be reached like this, keep according to bandwidth situation subsequently or adjust the transmission ratio between Primary layer and enhancement layer, can ensure that video base layer data preferentially arrives user side like this, opposing network jitter, makes the video fluency of user side and definition reach optimum.
Fig. 1 is the schematic flow sheet of an embodiment of multi-media signal transmission method of the present invention.
As shown in Figure 1, this embodiment can comprise the following steps:
S102, multi-media signal waiting for transmission is encoded, form coded audio data, video Primary layer coded data and video source modeling layer coded data, wherein, multi-media signal can comprise audio signal and vision signal, video base layer data is determined according to the minimum requirements of user terminal to resolution and frame per second, video source modeling layer data is doped again according to video base layer data, SVC coding can be carried out to video base layer data and video source modeling layer data, MP3 or AAC (AdvancedAudioCoding is carried out to voice data, advanced audio) etc. coded treatment,
S104, encode audio data respectively, video Primary layer coded data and video source modeling layer coded data encapsulate, except traditional encapsulation process, also comprise the encapsulation to different pieces of information mark, such as, video base layer data can be identified with AVC1, video source modeling layer data is identified with SVCE, video source modeling layer can be one or more, when video source modeling layer is multiple, each video source modeling layer corresponds to different resolution and frame per second, such as, the resolution of the first video source modeling layer is CIF (CommonIntermediateFormat), frame per second is 10 frames/second, the resolution of the second video source modeling layer is CIF (or 720P etc.), frame per second is 25 frames/second, now SVC1 can be used, SVC2, SVC3 etc. identify different video source modeling layers,
S106, the user bandwidth according to feedback determines content waiting for transmission, and from the data after encapsulation, selects coded data waiting for transmission according to determined content waiting for transmission;
S108, according to the user bandwidth of feedback and the insertion position of user's packet loss determination forward error correction data, and is inserted in the coded data of relevant position by forward error correction data;
S110, when comprising video source modeling layer coded data in coded data waiting for transmission, transmits various coded data in proportion according to transmission time.
This embodiment enables video request program adapt to the unsteadiness of mobile network substantially, because video Primary layer coded data has preferentially downloaded to user terminal when network interruption time, so still can continue decoded, prevent the generation of the phenomenons such as video hiccups, make Consumer's Experience reach optimum.
The most basic video effect can be experienced to make user terminal, content waiting for transmission can comprise the coded audio data after encapsulation and video Primary layer coded data, further, when bandwidth allows, content waiting for transmission can also comprise the video source modeling layer coded data after encapsulation.
In step S108, can by the insertion position of following manner determination forward error correction data, to improve the decoding accuracy of receiving terminal before insertion after error correction data:
(1) the first packet loss threshold value of setting is greater than (such as at user's packet loss, first packet loss threshold value is 30%) and user bandwidth meets video Primary layer coded data bandwidth requirement time, the forward error correction data of Primary layer is inserted in video Primary layer coded data;
(2) the second packet loss threshold value of setting is less than (such as at user's packet loss, second packet loss threshold value is 5%) and user bandwidth meets video Primary layer coded data bandwidth requirement time, the forward error correction data of Primary layer is inserted in video source modeling layer coded data;
(3) when user bandwidth is greater than video Primary layer coded data bandwidth requirement, the forward error correction data of Primary layer is inserted in video Primary layer coded data or in video source modeling layer coded data.
In addition, in step s 110, when server is simultaneously to user side transmission of video Primary layer coded data and video source modeling layer coded data, in order to improve the anti-jitter function of user side when order video, following data transfer mode can be adopted:
(1) first to user's transmission of video Primary layer coded data at the initial time of transmission, in order to prevent shake, generally preferentially transmit Primary layer coded data to user side at initial time, the Primary layer coded data downloaded in advance can be utilized to ensure the most basic video effect to make the user side when shake appears in network;
(2) the transmission ratio of video source modeling layer coded data is increased gradually in the first half section moment of transmission, namely, at the preliminary stage of video request program, although transmitting partial video Primary layer coded data to user side at the beginning, but also have part base layer data not transmit, still to try one's best prioritised transmission base layer data while the good video effect of guarantee, the transmission ratio of base layer data and enhancement data now can be made to be greater than 1, such as, user's download bandwidth 70% for transmitting base layer data, remaining 30% for transmitting enhancement data, or 60% of download bandwidth for transmitting base layer data, and remaining 40% for transmitting enhancement data,
(3) the transmission ratio of video Primary layer coded data is reduced gradually in moment second half section of transmission, namely, owing to now having downloaded the base layer data of significant proportion at user side, consider video display effect, suitably can adjust the transmission ratio of base layer data and enhancement data, now, the transmission ratio of base layer data and enhancement data can be made to be less than 1, such as, user's download bandwidth 40% for transmitting base layer data, remaining 60% for transmitting enhancement data; Or 30% of download bandwidth for transmitting base layer data, remaining 70% for transmitting enhancement data, As time goes on, even can reach 20% of download bandwidth for transmitting base layer data, 80% for transmitting enhancement data or 10% for transmitting base layer data, 90% for transmitting enhancement data (now, most base layer data is downloaded to user side).
In another embodiment of multi-media signal transmission method of the present invention, the process that video server transmits data to user side can be divided into two parts:
1, the encapsulation process of video code flow:
Step one, by supporting that the encoder of SVC characteristic is encoded to realtime graphic or offline image signal, and form video Primary layer coded data and video source modeling layer coded data, wherein video Primary layer coded data and video source modeling layer coded data are discretely and be synchronously input in encapsulation unit, and encapsulation unit will carry out packing process to these two kinds of data;
Particularly, first video information to be encoded is decomposed into the spatial domain layer information of two different resolutions by spatial domain down-sampling, each spatial domain layer passes through based on MCTF (MotionCompensatedTemporalFiltering again, the time-domain filtering of motion compensation) technology carries out Time Domain Decomposition, the movable information obtained in decomposable process can carry out prediction at interlayer and last coding, high pass frames texture information after decomposition can use and carry out predicting in layer with H.264 identical infra-frame prediction mode, or use the reconstruction texture of spatial domain low layer to carry out inter-layer prediction, low pass frames texture uses and predicts with H.264 identical inter prediction mode, prediction redundancy can also carry out inter-layer residual prediction again, finally final prediction redundancy is converted and entropy code, SNR graded properties can be provided by carrying out recurring quantization to conversion coefficient in cataloged procedure.
Step 2, carry out the encapsulation of video file, for MP4 Document encapsulation, contents all for MP4 is all stored in one to be called in the container of movie, as shown in Figure 2, this movie container can be made up of multiple videotrack, each videotrack is exactly a time dependent media sequence, such as, sequence of frames of video, each chronomere in track is a sample, it can be frame video or an audio frequency, sample arranges in chronological order, it is to be noted, one frame audio frequency can resolve into multiple audio frequency sample, so audio frequency generally uses sample as unit, and without frame, a time frame or data cell is represented with this word of sample in the definition of MP4 file format, each track has again one or more sample and describes, each sample inside track is associated with a sample by reference and describes, this sample describes to define and how to decode to this sample, such as, the compression algorithm etc. used.Encapsulation unit can carry out the sealed storage of media data according to the actual conditions of SVC coded data, such as, all independently media track is (namely as one using every one deck of SVC coded data for encapsulation unit, videotrack) encapsulate, if there is no enhancement data, encapsulating structure is identical with common media encapsulating structure, if there is enhancement data, then can by increasing new media track to realize, when encapsulating SVC coded data, for base layer data, use and describe (Sampledescription) identical symbol with original media unit, such as, AVC1 (H.264), and enhancement data uses different descriptor, such as, SVCE, the new SVC file format of encapsulation and the maximum compatibility of original system can be ensured like this, when there is multiple enhancement layer at the same time, multi-level symbol can be used to identify, to ensure that multilayer strengthens the level relation between data, such as, SVC1, SVC2, SVC3 etc.
2, the restructuring of video data and the insertion of transmission error correction data
Step 3, data selecting unit is increased in video server, with according to user's download bandwidth situation determination transmission policy, such as whether transmit enhancement data, if transmission enhancement data, how its resolution and frame per second are selected, and in addition, can also determine the insertion position of FEC data according to the packet loss of bandwidth situation and user side.
Step 4, video in SVC media file and voice data are split, and the data meeting the transmission policy determined in step 3 are combined, the enhancement data of base layer data and needs is divided into two groups, in Primary layer or enhancement layer, adds required FEC data according to user's download bandwidth situation and packet loss.Such as, when packet loss reaches more than 30% and user bandwidth can meet base layer data bandwidth, the FEC data of Primary layer can be added in Primary layer coded data in order to resist the impact that packet loss causes; When packet loss is little and user bandwidth meets base layer data bandwidth, can the FEC data of Primary layer be added in enhancement layer coding data, the preferential fast transport ensureing base layer data; When broader bandwidth is abundant (such as, during higher than the bandwidth threshold set, or during much larger than base layer data bandwidth requirement), the FEC data of Primary layer can being added in Primary layer coded data or in enhancement layer coding data, the chance being recovered base layer data by FEC error correction can be had like this when there is packet loss.
Step 5, base layer data and enhancement data is sent to user by certain allocated bandwidth ratio, such as, in the video playback incipient stage, first can send base layer data to user, the object starting fast and play can be reached like this, can also buffer memory part base layer data use in order to during network jitter in advance simultaneously, if the network bandwidth is stablized subsequently, the download of base layer data preferentially can be ensured in the first half stage of downloading, distribute the download that the sub-fraction network bandwidth is used for enhancement data, with ensure stable obtain the prerequisite of base layer data under obtain enhancement data again.
In addition, script data stream can also be added in video source modeling layer coded data, such as, the control flow check of JavaScript form, such control flow check can be transferred to user side with video flowing simultaneously, not only increases the real-time of control, but also saves the network bandwidth to a certain extent.
One of ordinary skill in the art will appreciate that, realize the whole of said method embodiment to have been come by the hardware that program command is relevant with part steps, aforesaid program can be stored in a computing equipment read/write memory medium, this program is when performing, perform and comprise the step of said method embodiment, and aforesaid storage medium can comprise ROM, RAM, magnetic disc and CD etc. various can be program code stored medium.
Fig. 3 is the structural representation of an embodiment of multimedia signal transmission device of the present invention.
As shown in Figure 3, the device 300 in this embodiment can comprise:
Coding unit 301, for encoding to multi-media signal waiting for transmission, form coded audio data, video Primary layer coded data and video source modeling layer coded data, wherein, video source modeling layer can be one or more (such as, more than two), when video source modeling layer is multiple, each video source modeling layer corresponds to different resolution and frame per second;
Encapsulation unit 302, is connected with coding unit, for encode audio data, video Primary layer coded data and video source modeling layer coded data encapsulate respectively;
Data selecting unit 303, be connected with encapsulation unit, for determining content waiting for transmission according to the user bandwidth of feedback, and from the data after encapsulation, select coded data waiting for transmission according to determined content waiting for transmission, wherein, content waiting for transmission can include but not limited to the coded audio data after encapsulating and video Primary layer coded data, if user bandwidth allows, content waiting for transmission can also comprise the video source modeling layer coded data after encapsulation;
Error correction plug-in unit 304, be connected with data selecting unit, for the insertion position according to the user bandwidth fed back and user's packet loss determination forward error correction data, and forward error correction data is inserted in the coded data of relevant position, wherein, the insertion position of forward error correction data can comprise video Primary layer coded data and video source modeling layer coded data, such as, when user's packet loss is greater than the first packet loss threshold value of setting and user bandwidth meets video Primary layer coded data bandwidth requirement, the forward error correction data of Primary layer is inserted in video Primary layer coded data, when user's packet loss is less than the second packet loss threshold value of setting and user bandwidth meets video Primary layer coded data bandwidth requirement, the forward error correction data of Primary layer is inserted in video source modeling layer coded data, when user bandwidth is greater than video Primary layer coded data bandwidth requirement, the forward error correction data of Primary layer is inserted in video Primary layer coded data or in video source modeling layer coded data,
Ratio-dependent unit 305, be connected with error correction plug-in unit, for comprising video source modeling layer coded data in coded data waiting for transmission, various coded data is transmitted in proportion according to transmission time, such as, ratio-dependent unit can at the initial time of transmission first to user's transmission of video Primary layer coded data, increase the transmission ratio of video source modeling layer coded data in the first half section moment of transmission gradually, reduce the transmission ratio of video Primary layer coded data in moment second half section of transmission gradually.
In this specification, each embodiment all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, and part identical with similar between each embodiment can cross-reference.For device embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part can see the explanation of embodiment of the method part.
The above embodiment of the present invention is by excavating the feature of H.264-SVC coding techniques, based on encapsulation criteria optimization current video transmission manner, method for packing and the mechanism for correcting errors of media file format, make mobile video order can adapt to the unsteadiness of mobile network substantially, because base layer data has preferentially downloaded to user side when network interruption time, so still can continue decoded, Consumer's Experience is made to reach optimum.
Finally it is pointed out that the application is not only applicable to mobile network, be also applicable to the system that any network bandwidth is limited, such as, fixed network.
Although be described in detail specific embodiments more of the present invention by example, it should be appreciated by those skilled in the art, above example is only to be described, instead of in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can without departing from the scope and spirit of the present invention, above embodiment be modified.Scope of the present invention is limited by claims.
Claims (12)
1. a multi-media signal transmission method, comprising:
Multi-media signal waiting for transmission is encoded, forms coded audio data, video Primary layer coded data and video source modeling layer coded data;
Respectively described coded audio data, described video Primary layer coded data and described video source modeling layer coded data are encapsulated;
It is characterized in that, also comprise:
User bandwidth according to feedback determines content waiting for transmission, and from the data after encapsulation, selects coded data waiting for transmission according to determined content waiting for transmission;
According to the user bandwidth of feedback and the insertion position of user's packet loss determination forward error correction data, and described forward error correction data is inserted in the coded data of relevant position;
When comprising video source modeling layer coded data in coded data waiting for transmission, transmit various coded data in proportion according to transmission time.
2. multi-media signal transmission method according to claim 1, is characterized in that, described content waiting for transmission comprises the coded audio data after encapsulation and video Primary layer coded data.
3. multi-media signal transmission method according to claim 2, is characterized in that, described content waiting for transmission also comprises the video source modeling layer coded data after encapsulation.
4. multi-media signal transmission method according to claim 1, is characterized in that, the described step according to the user bandwidth of feedback and the insertion position of user's packet loss determination forward error correction data comprises:
When described user's packet loss is greater than the first packet loss threshold value of setting and described user bandwidth meets video Primary layer coded data bandwidth requirement, the forward error correction data of Primary layer is inserted in video Primary layer coded data;
When described user's packet loss is less than the second packet loss threshold value of setting and described user bandwidth meets video Primary layer coded data bandwidth requirement, the forward error correction data of Primary layer is inserted in video source modeling layer coded data;
When described user bandwidth is greater than video Primary layer coded data bandwidth requirement, the forward error correction data of Primary layer is inserted in video Primary layer coded data or in video source modeling layer coded data.
5. multi-media signal transmission method according to claim 1, is characterized in that, the described step transmitting various coded data in proportion according to transmission time comprises:
First to described user's transmission of video Primary layer coded data at the initial time of transmission;
The transmission ratio of video source modeling layer coded data is increased gradually in the first half section moment of transmission;
The transmission ratio of video Primary layer coded data is reduced gradually in moment second half section of transmission.
6. multi-media signal transmission method according to claim 1, is characterized in that, described video source modeling layer is one or more, and when described video source modeling layer is multiple, each video source modeling layer corresponds to different resolution and frame per second.
7. a multimedia signal transmission device, comprising:
Coding unit, for encoding to multi-media signal waiting for transmission, forms coded audio data, video Primary layer coded data and video source modeling layer coded data;
Encapsulation unit, is connected with described coding unit, for encapsulating described coded audio data, described video Primary layer coded data and described video source modeling layer coded data respectively;
It is characterized in that, also comprise:
Data selecting unit, is connected with described encapsulation unit, for determining content waiting for transmission according to the user bandwidth of feedback, and from the data after encapsulation, selects coded data waiting for transmission according to determined content waiting for transmission;
Error correction plug-in unit, is connected with described data selecting unit, for the insertion position according to the user bandwidth fed back and user's packet loss determination forward error correction data, and is inserted in the coded data of relevant position by described forward error correction data;
Ratio-dependent unit, is connected with described error correction plug-in unit, for comprising video source modeling layer coded data in coded data waiting for transmission, transmits various coded data in proportion according to transmission time.
8. multimedia signal transmission device according to claim 7, is characterized in that, described content waiting for transmission comprises the coded audio data after encapsulation and video Primary layer coded data.
9. multimedia signal transmission device according to claim 8, is characterized in that, described content waiting for transmission also comprises the video source modeling layer coded data after encapsulation.
10. multimedia signal transmission device according to claim 7, is characterized in that, the insertion position of described forward error correction data comprises video Primary layer coded data and video source modeling layer coded data.
11. multimedia signal transmission devices according to claim 7, it is characterized in that, described ratio-dependent unit is first to described user's transmission of video Primary layer coded data at the initial time of transmission, increase the transmission ratio of video source modeling layer coded data in the first half section moment of transmission gradually, reduce the transmission ratio of video Primary layer coded data in moment second half section of transmission gradually.
12. multimedia signal transmission devices according to claim 7, is characterized in that, described video source modeling layer is one or more, and when described video source modeling layer is multiple, each video source modeling layer corresponds to different resolution and frame per second.
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| CN102131083A (en) * | 2010-01-18 | 2011-07-20 | 西安电子科技大学 | Method and device for transmitting scalable videos based on priorities |
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