CN1972454A - Mobile multimedia broadcasting real-time traffic flow packaging method - Google Patents
Mobile multimedia broadcasting real-time traffic flow packaging method Download PDFInfo
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- CN1972454A CN1972454A CN 200610157166 CN200610157166A CN1972454A CN 1972454 A CN1972454 A CN 1972454A CN 200610157166 CN200610157166 CN 200610157166 CN 200610157166 A CN200610157166 A CN 200610157166A CN 1972454 A CN1972454 A CN 1972454A
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Abstract
This invention discloses one sealing method of mobile multi-media broadcasting flow, which comprises the following steps: a, sealing visual frequency data into visual section and audio data into audio section and other data into data section and relative parameters into frame head; b, forming one compound frame by sub frame head, visual section, audio section and data and sealing sub frame into broadcasting signal channel for transmission; c, after terminal signal channel receives sub frame and takes visual data and audio data and other data for receiving and playing.
Description
Technical field
The present invention relates to Mobile Multimedia Broadcasting or technical field of mobile TV, relate in particular to a kind of method for packing of mobile multimedia broadcasting real-time traffic flow.
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 accept to select the multi-medium data of channel, is implemented in and sees TV on the portable terminal.
The aerial data of system emission are divided into different channels, and the data of each channel comprise again: three types of video, audio frequency and data, need transmit respectively by multiplex technique, terminal can receive relevant data, by the player on the terminal, realizes the normal play of TV.
Existing video/audio data encapsulation method has two kinds: the one, and TS (transport stream) mode, the TS agreement is a kind of in MPEG (Motion Picture Experts Group) standard, it is placed on video, audio frequency in the bag of fixing 188 byte-sized and transmits, proofread and correct bag by tranmitting data register, realized functions such as clock synchronization.The 2nd, RTP (RTP) mode is the method that transmits the video/audio data in IP network, and the size of bag is fixing, and the time stamp by each subframe head guarantees the time synchronized play, guarantees the broadcast order that wraps by sequence number.
In the method for packing of above-mentioned TS mode, there is a large amount of padding datas in the bag of TS, in order to realize functions such as clock synchronization, will send a plurality of clock synchronization bags each second, so efficiency of transmission is lower, such as data channel to a 256Kbit/s, can only provide the bandwidth of 230Kbit/s, if give audio frequency 32Kbit/s, synchrodata 8Kbit/s, then the video data bandwidth has only 190Kbit/s, and efficiency of transmission can only reach 90%.And above-described RTP mode then can only be used on IP network, is not suitable for using in mobile media broadcasting network.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method for packing of mobile multimedia broadcasting real-time traffic flow, and the efficiency of transmission of real-time multimedia data in mobile multimedia broadcast system is improved.
In order to solve the problems of the technologies described above, the invention provides a kind of method for packing of mobile multimedia broadcasting real-time traffic flow, comprise the steps:
(1) video data is encapsulated in video-frequency band, voice data is encapsulated in audio section, at data segment, the parameter in bundle frame head length, initial reproduction time, video-frequency band length, audio section length, data segment, length and the expansion area is encapsulated in the subframe head with other data encapsulation;
(2) subframe head, video-frequency band, audio section, data segment are formed a multiplexed sub frame;
(3) multiplexed sub frame is encapsulated in the broadcast channel transmits;
(4) after terminal receives multiplexed sub frame from broadcast channel, take out the parameter in the subframe head successively, and according to video-frequency band length, audio section length, data segment, length, take out video data, the voice data in the audio section and other data in the data segment in the video-frequency band, carry out the reception and the broadcast of video, audio frequency and data.
Wherein, described subframe head also comprises check code.
Wherein, described video-frequency band is made up of video paragraph header and a plurality of video unit.
Wherein, described audio section is made up of audio frequency paragraph header and a plurality of audio unit.
Wherein, the length of the video unit that described video data comprises is variable, and described information is recorded in the described video paragraph header.
Wherein, the length of the audio unit that described voice data comprises is variable, and described information is recorded in the described audio frequency paragraph header.
The method for packing of a kind of mobile multimedia broadcasting real-time traffic flow of the present invention is by encapsulating multiple real-time multimedia data in a channel, transmit video flowing and audio stream with video unit, audio unit, stipulated the basic format of media data encapsulation, transmitted stream in real time in the multi-media broadcasting system thereby be implemented in.
Description of drawings
Fig. 1 is the schematic diagram according to the method for packing of the described a kind of mobile multimedia broadcasting real-time traffic flow of the embodiment of the invention;
Fig. 2 forms schematic diagram according to the subframe header of data channel in the method for packing of the described a kind of mobile multimedia broadcasting real-time traffic flow of the embodiment of the invention;
Fig. 3 is the composition schematic diagram according to video-frequency band encapsulation in the method for packing of the described a kind of mobile multimedia broadcasting real-time traffic flow of the embodiment of the invention;
Fig. 4 is the composition schematic diagram according to the method for packing middle pitch frequency range encapsulation of the described a kind of mobile multimedia broadcasting real-time traffic flow 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 schematic diagram of the method for packing of the described a kind of mobile multimedia broadcasting real-time traffic flow of the embodiment of the invention.
Mobile Multimedia Broadcasting can send 1 broadcast channel frame structured data in a Fixed Time Interval, Fixed Time Interval can be 1 second, also can be the other times value, and broadcast channel frame has comprised a plurality of multiplexed sub frames.
The data of 1 channel are made up of subframe head, video-frequency band, voice segments, data segment, video data is encapsulated in video-frequency band, voice data is encapsulated in audio section, other data encapsulation are at data segment, and the parameter in bundle frame head length, initial reproduction time, video-frequency band length, audio section length, data segment, length and the expansion area is encapsulated in the subframe head.
With reference to figure 2, for the subframe header of data channel in the method for packing of the described a kind of mobile multimedia broadcasting real-time traffic flow of the embodiment of the invention is formed schematic diagram.The subframe head of data channel is mainly control information, specifically comprises:
(1) head length degree, the length of expression subframe head.
(2) initial reproduction time.Be used to guarantee that the video/audio equal time of playing is synchronous.
(3) length information.Comprise: video-frequency band length, audio section length and data segment, length.
(4) video parameter.Comprise: video flowing sum, video coding algorithm kind, video frequency coding rate, video frame frequency, video level resolution, video vertical resolution etc.
(5) audio frequency parameter.Comprise: audio stream sum, encryption algorithm kind, encoder bit rate, sample rate etc.
(6) check code.
Wherein, described check code can be verified the reliability of subframe header.
With reference to figure 3, be the composition schematic diagram of video data encapsulation in the method for packing of the described a kind of mobile multimedia broadcasting real-time traffic flow of the embodiment of the invention.The video-frequency band of described encapsulation comprises: video paragraph header, a plurality of identical synchronous heads and corresponding with it a plurality of different video unit.Video-frequency band can be cut into a plurality of video units, cuts apart with synchronous code between each video unit, and to realize wrong isolation features, synchronous code is optionally, also can not have.
Wherein, the relevant information of described video unit is all described in the video paragraph header, and the video paragraph header comprises:
(1) length of each video unit.
(2) frame type of each video unit.
(3) stream of each video unit numbering.
(4) relative time of the broadcast of each video unit stabs.
Hence one can see that, and the length of each video unit is variable, thereby can improve the utilance of video Data Transmission.
With reference to figure 4, be the composition schematic diagram of the method for packing sound intermediate frequency data encapsulation of the described a kind of mobile multimedia broadcasting real-time traffic flow of the embodiment of the invention.The audio section of described encapsulation is according to comprising: audio frequency paragraph header, a plurality of identical synchronous heads and corresponding with it a plurality of different audio unit.Voice data can be cut into a plurality of audio units, cuts apart with synchronous code between each audio unit, to realize wrong isolation features.Synchronous code is optionally, also can not have
Wherein, the relevant information of described audio unit is all described in the audio frequency paragraph header, and the audio frequency paragraph header comprises:
(1) length of each audio unit.
(2) audio stream of each audio unit numbering.
(3) relative time of the broadcast of each audio unit stabs.
Hence one can see that, and the length of each audio unit is variable, thereby can improve the utilance of audio data transmission.
The present invention will be further described below by an example.
In this example, 1 channel has the speed of 256Kbit/s.
The total length of this channel is the 32K byte, wherein: subframe head length 122 bytes, video unit has 25, video-frequency band head length 127 bytes, the long 26.5K byte of video data, audio unit has 25, audio section head length 129 bytes, audio frequency segment length 4K byte, data segment length 1K byte, for the part of not enough 32K byte, can fill complete 0.
Such television channel, the video data of 212Kbit/s speed can be provided, the voice data of 32Kbit/s speed, synchrodata with 8Kbit/s speed, can satisfy the transmission of the video data of the H264 of QVGA resolution, 25 frames or AVS-M, the mobile broadcast television program of suitable satisfactory quality can be provided to the user.If a passage can provide more bandwidth, can provide higher-quality program.
And in the method for packing of present employed TS mode, there is a large amount of padding datas in the bag of TS, in order to realize functions such as clock synchronization, will send a plurality of clock synchronization bags each second, so efficiency of transmission can only reach the data channel of 90%, one 256Kbit/s, the bandwidth of 230Kbit/s can only be provided, if give audio frequency 32Kbit/s, synchrodata 8Kbit/s, then the video data bandwidth has only 190Kbit/s.
Because radio spectrum resources is very valuable, the method of the invention has adopted bigger bag, each video unit approximately is more than the 1K byte, therefore bandwidth availability ratio is just very high, thereby make the wireless frequency spectrum utilance of the method for the invention reach 98%, compare the utilance that the TS mode has improved 8 percentage points.
Method of the present invention has realized the encapsulation to video data, voice data, other data, it is a kind of elongated method for packing, the transmission rate of real-time multimedia data in mobile multimedia broadcast system is improved, and can be applied to multiple network.
Above-mentioned embodiment describes the present invention with preferred embodiment, should not be regarded as limitation of the scope of the invention.Equally, according to the description of technical scheme of the present invention and preferred embodiment thereof, can make various possible being equal to and change or replacement, and all these changes or replacement all should belong to the protection range of claim of the present invention.
Claims (6)
1. the method for packing of a mobile multimedia broadcasting real-time traffic flow comprises the steps:
(1) video data is encapsulated in video-frequency band, voice data is encapsulated in audio section, at data segment, the parameter in bundle frame head length, initial reproduction time, video-frequency band length, audio section length, data segment, length and the expansion area is encapsulated in the subframe head with other data encapsulation;
(2) subframe head, video-frequency band, audio section, data segment are formed a multiplexed sub frame;
(3) multiplexed sub frame is encapsulated in the broadcast channel transmits;
(4) after terminal receives multiplexed sub frame from broadcast channel, take out the parameter in the subframe head successively, and according to video-frequency band length, audio section length, data segment, length, take out video data, the voice data in the audio section and other data in the data segment in the video-frequency band, carry out the reception and the broadcast of video, audio frequency and data.
2. the method for claim 1 is characterized in that, described subframe head also comprises check code.
3. the method for claim 1 is characterized in that, described video-frequency band is made up of video paragraph header and a plurality of video unit.
4. the method for claim 1 is characterized in that, described audio section is made up of audio frequency paragraph header and a plurality of audio unit.
5. method as claimed in claim 3 is characterized in that the length of the video unit that described video data comprises is variable, and described information is recorded in the described video paragraph header.
6. method as claimed in claim 4 is characterized in that the length of the audio unit that described voice data comprises is variable, and described information is recorded in the described audio frequency paragraph header.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009137972A1 (en) * | 2008-05-13 | 2009-11-19 | 中兴通讯股份有限公司 | A method and system for transmitting video-audio in same stream and the corresponding receiving method and device |
| WO2010009657A1 (en) * | 2008-07-25 | 2010-01-28 | 中兴通讯股份有限公司 | A method for transmitting service data stream |
| CN101202920B (en) * | 2007-12-19 | 2010-06-23 | 北京创毅视讯科技有限公司 | Data sending, transmission method, launching system and terminal in broadcast system |
| CN101453653B (en) * | 2007-12-07 | 2011-01-05 | 中兴通讯股份有限公司 | Method for spreading digital audio and video parameter set |
| CN102169706A (en) * | 2011-01-28 | 2011-08-31 | 杭州海康威视软件有限公司 | Method and device for storing and playing YUV file |
| CN101272200B (en) * | 2008-05-13 | 2011-09-21 | 中兴通讯股份有限公司 | Multimedia stream synchronization caching method and system |
| CN101222290B (en) * | 2007-11-09 | 2013-01-02 | 北京创毅视讯科技有限公司 | Data transmission method, emission system and terminal in broadcasting system |
| CN103313103A (en) * | 2013-05-15 | 2013-09-18 | 无锡北斗星通信息科技有限公司 | Television signal transmitter combining ground television transmission and network television transmission |
| CN103856784A (en) * | 2012-12-03 | 2014-06-11 | 联想(北京)有限公司 | Data sending method, data receiving method and electronic devices |
| CN109617891A (en) * | 2018-12-26 | 2019-04-12 | 北京数码视讯技术有限公司 | Code stream transmission method and device |
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2006
- 2006-11-30 CN CN 200610157166 patent/CN1972454A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101222290B (en) * | 2007-11-09 | 2013-01-02 | 北京创毅视讯科技有限公司 | Data transmission method, emission system and terminal in broadcasting system |
| CN101453653B (en) * | 2007-12-07 | 2011-01-05 | 中兴通讯股份有限公司 | Method for spreading digital audio and video parameter set |
| CN101202920B (en) * | 2007-12-19 | 2010-06-23 | 北京创毅视讯科技有限公司 | Data sending, transmission method, launching system and terminal in broadcast system |
| WO2009137972A1 (en) * | 2008-05-13 | 2009-11-19 | 中兴通讯股份有限公司 | A method and system for transmitting video-audio in same stream and the corresponding receiving method and device |
| CN101272200B (en) * | 2008-05-13 | 2011-09-21 | 中兴通讯股份有限公司 | Multimedia stream synchronization caching method and system |
| WO2010009657A1 (en) * | 2008-07-25 | 2010-01-28 | 中兴通讯股份有限公司 | A method for transmitting service data stream |
| CN102169706A (en) * | 2011-01-28 | 2011-08-31 | 杭州海康威视软件有限公司 | Method and device for storing and playing YUV file |
| CN102169706B (en) * | 2011-01-28 | 2015-04-29 | 杭州海康威视数字技术股份有限公司 | Method and device for storing and playing YUV file |
| CN103856784A (en) * | 2012-12-03 | 2014-06-11 | 联想(北京)有限公司 | Data sending method, data receiving method and electronic devices |
| CN103856784B (en) * | 2012-12-03 | 2019-02-05 | 联想(北京)有限公司 | Data sending, receiving method and electronic equipment |
| CN103313103A (en) * | 2013-05-15 | 2013-09-18 | 无锡北斗星通信息科技有限公司 | Television signal transmitter combining ground television transmission and network television transmission |
| CN103313103B (en) * | 2013-05-15 | 2016-01-06 | 海安常大技术转移中心有限公司 | The TV signal transmitter of compatible terrestrial television transmission and network TV transmission |
| CN109617891A (en) * | 2018-12-26 | 2019-04-12 | 北京数码视讯技术有限公司 | Code stream transmission method and device |
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