CN1960509B - Method for implementing fault isolation in time of transferring media data of mobile multimedia broadcast - Google Patents
Method for implementing fault isolation in time of transferring media data of mobile multimedia broadcast Download PDFInfo
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- CN1960509B CN1960509B CN200610112076A CN200610112076A CN1960509B CN 1960509 B CN1960509 B CN 1960509B CN 200610112076 A CN200610112076 A CN 200610112076A CN 200610112076 A CN200610112076 A CN 200610112076A CN 1960509 B CN1960509 B CN 1960509B
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Abstract
The method comprises: 1) at sending end, segmenting multimedia data into multi independent media data units; 2) recording the length information about each media data unit in the header information of the media data; 3) adding syn code between each media data unit to separate the multimedia data unit; 4) sending the header information, the media data units and the syn codes between the media data units to the receiving end. By the invention, after terminal receives the media data, even in the case of appearing error code, the error cannot be spread due to the correct segmentation of different data blocks.
Description
Technical field
The present invention relates to Mobile Multimedia Broadcasting or technical field of mobile TV, relate in particular to a kind of wrong method of isolating that when transferring media data of mobile multimedia broadcast, realizes, be applicable in the mobile broadcast network.
Background technology
Mobile Multimedia Broadcasting is a kind of Play Technique for Multimedia of rising in recent years.By hand-held terminal, under the situation of high-speed mobile, can watch TV.Terminal receives programme by wireless protocols, and can select the channel of oneself having the right to watch, thereby can receive the multi-medium data of selected channel, is implemented in and watches TV on the portable terminal.
The aerial data of system's emission are divided into different channels, transmit respectively by multiplex technique, and terminal can receive relevant data, by the player on the terminal, realize the normal play of TV.
For same channel, need to send video data, voice data, video data is divided into several video units, equally, voice data also is divided into several audio units, need between each unit and can make a distinction, and will make the mistake of a unit can not influence another unit.This just needs a kind of wrong method of isolating that realizes.
At present, the method for realization mistake isolation commonly used has following two kinds:
(1.TS transport stream) mode, the TS agreement is MPEG (Moving Picture Expert Group, Motion Picture Experts Group) a kind of in the standard, it is placed on basic video, an audio unit in a plurality of bags of fixing 188 byte-sized and transmits, because the size of video unit and audio unit can just be filled up the TS bag of these fixed sizes, this just needs a large amount of padding datas.
(2.ISMA internet stream media alliance) mode, the ISMA standard is with RTP (RTP) transfer medium information, the size of RTP bag is variable, and each video, audio unit can be placed on different RTP bags and transmit, and this mode is adapted at using on the IP network.
The TS mode needs some bandwidth resources of waste because the size of bag is fixed, and efficient is lower, and the ISMA mode can only be used on IP network.These two kinds of methods all are with independently wrapping the divided video voice data.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of wrong method of isolating that realizes when transferring media data of mobile multimedia broadcast, make terminal after receiving media data, occurring under the situation of error code, can correctly cut apart different data blocks so that mistake can not spread.
In order to solve the problems of the technologies described above, the invention provides a kind of wrong method of isolating that when transferring media data of mobile multimedia broadcast, realizes, be applicable to comprise the steps: in the mobile broadcast network
(1) at transmitting terminal media data is divided into a plurality of independently media data units;
(2) length information with each media data units is recorded in the header packet information of described media data;
(3) adding synchronous code between each media data units separates;
(4) will comprise header packet information, each media data units, and the media data of the synchronous code between the media data units sends to receiving terminal.
Wherein, further comprise: (5) receiving terminal is according to the length information of each media data units that writes down in the header packet information, and/or synchronous code, restores each media data units.
Wherein, described step (5) comprising: (51A) receiving terminal cuts out each media data units according to the length information of each media data units that writes down in the header packet information that receives from the data that receive.
Wherein, described step (5) comprising: (51B) receiving terminal is searched for synchronous code in the media data that receives, with the data between two synchronous codes as media data units.
Wherein, described step (5) comprising: (51) receiving terminal cuts out each media data units according to the length information of each media data units that writes down in the header packet information that receives from the data that receive;
(52) whether preceding some bytes of the described current media data cell that cuts out of check are synchronous codes, and check whether preceding some bytes of next media data units are synchronous codes, if assay is incorrect, then do not use the described media data units that cuts out according to length information, but in the media data that receives, search for synchronous code, with the data between two synchronous codes as this media data units.
Wherein, described media data comprises video data and/or voice data.
Wherein, in the described step (1), every frame media data can cut into one or more media data units.
Wherein, in the described step (1), media data is divided into a plurality of independently media data units with arbitrary time span.
A kind of wrong method of isolating that when transferring media data of mobile multimedia broadcast, realizes of the present invention, be applicable in the mobile broadcast network, be when sending media data, cut apart each media data jointly by length field, synchronous code, can prevent error code, guaranteeing correctly to be partitioned into media data units, thereby the mistake that realizes media data is isolated.
Description of drawings
Fig. 1 is according to the described a kind of process blocks schematic diagram of realizing wrong partition method when the transferring media data of mobile multimedia broadcast of the embodiment of the invention;
Fig. 2 is according to the described a kind of schematic diagram of realizing that video data error is isolated in the wrong method of isolating when the transferring media data of mobile multimedia broadcast of the embodiment of the invention;
Fig. 3 is according to the described a kind of schematic diagram of realizing that wrong method sound intermediate frequency error in data of isolating is isolated when the transferring media data of mobile multimedia broadcast of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done detailed description.
With reference to figure 1, be the described a kind of process blocks schematic diagram of realizing wrong partition method when the transferring media data of mobile multimedia broadcast of the embodiment of the invention.Detailed process is as follows:
Step 110: media data is divided into a plurality of independently media data units at transmitting terminal;
Step 120: the length information of each media data units is recorded in the header packet information of described media data;
Step 130: between each media data units, add synchronous code and separate;
Step 140: will comprise header packet information, each media data units, and the media data of the synchronous code between the media data units sends to receiving terminal.
With reference to figure 2, being the described a kind of schematic diagram of realizing that video data error is isolated in the wrong method of isolating when the transferring media data of mobile multimedia broadcast of the embodiment of the invention. video data is made up of video packet header, a plurality of synchronous code, a plurality of video unit, video data can be divided into a plurality of independently video units, and 1 frame can cut into 1 video unit or a plurality of video unit. and the detailed process that video data error is isolated is as follows:
At transmitting terminal video data is divided into a plurality of independently video units, length information with each video unit is recorded in the header packet information of described video data again, separate video unit by between each video unit, adding synchronous code, to comprise header packet information, each video unit then, and the video data of the synchronous code between the video unit sends to receiving terminal.
Receiving terminal is again according to the length information of each video unit that writes down in the header packet information, and/or synchronous code, restores each video unit.Reduction process is: receiving terminal is according to the length information of each video unit that writes down in the header packet information that receives, from the data that receive, cut out each video unit, check then whether preceding some bytes of the described current video unit that cuts out are synchronous codes, and check whether preceding some bytes of next video unit are synchronous codes, if assay is correct, then use and deserve preceding video unit, if assay is incorrect, then do not use the described video unit that cuts out according to length information, but in the video data that receives, search for synchronous code, with the data between two synchronous codes as this video unit.
With reference to figure 3, be the described a kind of schematic diagram of realizing that wrong method sound intermediate frequency error in data of isolating is isolated when the transferring media data of mobile multimedia broadcast of the embodiment of the invention.Voice data is made up of audio frequency packet header, a plurality of synchronous code, a plurality of audio unit, voice data can be divided into a plurality of independently audio units, and the time interval is an arbitrary value, can adjust, can be 50ms as an audio unit, also can be that 100ms is as an audio unit.The detailed process that the voice data mistake is isolated is as follows:
At transmitting terminal voice data is divided into a plurality of independently audio units, length information with each audio unit is recorded in the header packet information of described voice data again, separate audio unit by between each audio unit, adding synchronous code, to comprise header packet information, each audio unit then, and the voice data of the synchronous code between the audio unit sends to receiving terminal.
Receiving terminal is again according to the length information of each audio unit that writes down in the header packet information, and/or synchronous code, restores each audio unit.Reduction process is: receiving terminal is according to the length information of each audio unit that writes down in the header packet information that receives, from the data that receive, cut out each audio unit, check then whether preceding some bytes of the described current audio unit that cuts out are synchronous codes, and check whether preceding some bytes of next audio unit are synchronous codes, if assay is correct, then use this current audio unit, if assay is incorrect, then do not use the described audio unit that cuts out according to length information, but in the voice data that receives, search for synchronous code, with the data between two synchronous codes as this video unit.
In addition, the synchronous code known to the tool between the video unit requires can not occur in video code flow, and the synchronous code between the audio unit requires can not occur in audio code stream, and in other words, synchronous code can not occur in video data, voice data.Embodiment of the present invention has selected the synchronous code of 3 byte lengths, is " 0,x00 00 01 ".
Below by an example the present invention is described further.
In this example, each data channel has the speed of 128Kbit/s, and 1 channel has comprised 2 data passages, and the speed of 256Kbit/s can be arranged.
The total length of this channel is the 32K byte, and wherein: video data has the 22.5K byte, the long 8K byte of voice data.Voice data comprises 2 tracks, and each track has 32Kbit/s.Frame frequency is 25 hertz, cuts into 25 video units, and audio frequency 100ms is 1 audio unit, cuts into 20 audio units.The described wrong partition method of the application of the invention between each video unit, the audio unit has improved the security performance that medium transmit.
As mentioned above, such television channel, can satisfy the transmission of the AAC audio track data of the transmission of video data of the H264 of 1 QVGA resolution, 25 frames or AVS-M and 2 32Kbit/s, can provide high-quality audio stream mobile broadcast television program for the user.
Claims (7)
1. when transferring media data of mobile multimedia broadcast, realize wrong method of isolating for one kind, be applicable to it is characterized in that in the mobile broadcast network, comprise the steps:
(1) at transmitting terminal media data is divided into a plurality of independently media data units;
(2) length information with each media data units is recorded in the header packet information of described media data;
(3) adding synchronous code between each media data units separates;
(4) will comprise header packet information, each media data units, and the media data of the synchronous code between the media data units sends to receiving terminal;
(5) receiving terminal is according to the length information of each media data units that writes down in the header packet information, and/or synchronous code, restores each media data units.
2. the method for claim 1 is characterized in that, described step (5) comprising:
(51A) receiving terminal cuts out each media data units according to the length information of each media data units that writes down in the header packet information that receives from the data that receive.
3. the method for claim 1 is characterized in that, described step (5) comprising:
(51B) receiving terminal is searched for synchronous code in the media data that receives, with the data between two synchronous codes as media data units.
4. the method for claim 1 is characterized in that, described step (5) comprising:
(51) receiving terminal cuts out each media data units according to the length information of each media data units that writes down in the header packet information that receives from the data that receive;
(52) whether preceding some bytes of the described current media data cell that cuts out of check are synchronous codes, and check whether preceding some bytes of next media data units are synchronous codes, if assay is incorrect, then do not use the described media data units that cuts out according to length information, but in the media data that receives, search for synchronous code, with the data between two synchronous codes as this media data units.
5. the method for claim 1 is characterized in that, described media data comprises video data and/or voice data.
6. the method for claim 1 is characterized in that, in the described step (1), every frame media data can cut into one or more media data units.
7. the method for claim 1 is characterized in that, in the described step (1), with arbitrary time span media data is divided into a plurality of independently media data units.
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| CN200610112076A CN1960509B (en) | 2006-08-29 | 2006-08-29 | Method for implementing fault isolation in time of transferring media data of mobile multimedia broadcast |
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| CN200610112076A CN1960509B (en) | 2006-08-29 | 2006-08-29 | Method for implementing fault isolation in time of transferring media data of mobile multimedia broadcast |
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| MX358550B (en) * | 2012-10-11 | 2018-08-24 | Samsung Electronics Co Ltd | Apparatus and method for delivering and receiving multimedia data in hybrid network. |
| CN104661049A (en) * | 2013-11-25 | 2015-05-27 | 乐视网信息技术（北京）股份有限公司 | Transmission method and transmission system for transport stream, streaming media server and terminal |
| CN111354384A (en) * | 2020-02-27 | 2020-06-30 | 北京奇艺世纪科技有限公司 | GIF picture generation method, playing method and device and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1520190A (en) * | 1997-06-27 | 2004-08-11 | ���ǵ�����ʽ���� | Multimedia multiplexing method |
| CN1528076A (en) * | 2001-02-20 | 2004-09-08 | ������������ʽ���� | Multi plexing device and demultiplexing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1520190A (en) * | 1997-06-27 | 2004-08-11 | ���ǵ�����ʽ���� | Multimedia multiplexing method |
| CN1528076A (en) * | 2001-02-20 | 2004-09-08 | ������������ʽ���� | Multi plexing device and demultiplexing device |
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