CN1972166B - An audio stream transport method of mobile multimedia broadcast system - Google Patents
An audio stream transport method of mobile multimedia broadcast system Download PDFInfo
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- CN1972166B CN1972166B CN2006101571655A CN200610157165A CN1972166B CN 1972166 B CN1972166 B CN 1972166B CN 2006101571655 A CN2006101571655 A CN 2006101571655A CN 200610157165 A CN200610157165 A CN 200610157165A CN 1972166 B CN1972166 B CN 1972166B
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Abstract
This invention relates to mobile multi-media broadcasting system audio flow send method, which comprises the following steps: a, coding the audio frequency flow to be sent each with only one code; b, cutting each flow into multiple audio units and sealing unit into audio section and recording each audio unit length, codes, times into audio section head; c, sealing audio section and other transmission data into one business channel; d, after receiving audio section, playing audio section flow.
Description
Technical field
The present invention relates to mobile multimedia broadcast system, more particularly, relate to a kind of one road audio frequency of mobile multimedia broadcast system or the transfer approach of multichannel voice frequency.
Background technology
Mobile Multimedia Broadcasting is a kind of Play Technique for Multimedia of rising in recent years.By portable terminal, under the situation of high-speed mobile, can watch TV.Portable terminal can receive programme by wireless protocols, and can select own programs of interest, thereby can flow by receiving multimedia data, is implemented on the portable terminal to teleview.
The aerial data of mobile multimedia broadcast system emission are divided into different channels, and by the multiplex technique transmission, portable terminal can receive relevant data, by the player on the terminal, realize the normal play of TV.
For same channel, mobile multimedia broadcast system can send 1 audio stream, also can send a plurality of audio streams.
The method that realizes many audio streams in the prior art has following 2 kinds:
First, TS (Transport Stream, transport stream) mode, the TS agreement is MPEG (Moving PictureExpert Group, Motion Picture Experts Group) a kind of in the standard, it is placed on video, audio frequency and control information in the packet of fixing 188 byte-sized and transmits, by PID (Program Identifier, program code) field is distinguished different audio streams, thereby can support the broadcast of many audio streams.
Second, ISMA (Internet Streaming Media Alliance, internet stream media alliance) mode, the ISMA standard is with RTP (Real Time Transport Protocol, RTP) transmits multimedia messages, can open a plurality of RTP passages, transmit different audio streams, this mode is adapted at using on the IP network.
Yet there are the following problems for the method for the many audio streams of above-mentioned existing techniques in realizing: each bag of TS mode is very little, and efficient is lower, and ISMA mode range of application is little, can only use on IP network.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of many audio streams implementation method that mobile multimedia broadcast system uses that is adapted at, and can send the voice data that comprises one or more audio streams of a channel.
In order to address the above problem, the invention provides a kind of audio stream transport method of mobile multimedia broadcast system, comprise the steps:
(1) will need the unified numbering of the audio stream that transmits, each audio stream has unique number;
(2) each audio stream is divided into a plurality of audio units, and audio unit is encapsulated in the audio section, with the length of each audio unit, audio stream numbering, reproduction time is recorded in the audio frequency paragraph header relatively;
(3) audio section and other data encapsulation that need transmit are transmitted in a service channel;
(4) after terminal receives audio section, take out each audio stream, carry out the broadcast of audio stream according to length, the audio stream numbering of each audio unit in the audio frequency paragraph header.
Wherein, described audio frequency paragraph header also comprises check code.
Wherein, add synchronous head between described each audio unit and do isolation.
Wherein, the data in the described service channel also comprise the subframe head, and described subframe head comprises the length of audio section and the parameter of audio section.
The present invention is by being encapsulated in a plurality of audio streams in the channel, and the voice data in the channel is divided into a plurality of audio units, transmit by one or more passages, can realize that 1 audio stream, 2 audio streams or the audio stream more than 2 transmit simultaneously in a channel, and have higher efficiency of transmission.
Description of drawings
Fig. 1 is that the channel data of one or more audio stream implementation method of mobile multimedia broadcast system of the present invention is sealed the assembling structure schematic diagram;
Fig. 2 is to use the present invention to realize the schematic diagram of 2 audio streams.
Embodiment
Be further described below in conjunction with accompanying drawing one or more audio stream implementation method mobile multimedia broadcast system of the present invention.
As shown in Figure 1, channel data comprises: subframe head, video-frequency band, audio section and data segment, voice data all are encapsulated in audio section.
Wherein, the subframe head is mainly control information, specifically comprises: length information, video parameter, audio frequency parameter, initial reproduction time, check code etc.The check code of subframe head is used for verifying the reliability of subframe header.
With the unified numbering of audio stream of needs transmission, each audio stream has unique number.Audio section is divided into audio frequency paragraph header and a plurality of audio unit, can do isolation with synchronous head between each audio unit, to reach wrong function of isolating.
Comprise descriptor in the audio frequency paragraph header to a plurality of audio units, comprise: the audio stream numbering of the sum of audio unit, the length of each audio unit, audio unit, relative reproduction time, check code, wherein, the length of audio unit can be used for locating cuts apart each audio unit data, can be provided with flexibly.Reproduction time is meant the time of broadcast relatively, and the audio stream numbering is to be used for identifying this audio unit to belong to which audio stream.In addition, can also be to the audio unit serial number, as element number.The check code of audio frequency paragraph header is the correctness that is used for verifying the audio frequency paragraph header.
Each audio stream is divided into a plurality of audio units, and audio unit is encapsulated in the audio section, audio section and other data encapsulation that need transmit is transmitted in a service channel again.After terminal receives audio section, take out each audio stream, carry out the broadcast of audio stream according to length, the audio stream numbering of each audio unit in the audio frequency paragraph header.
By said method, just realized in a channel, comprising a plurality of audio streams, so just can transmit by aerial with the form of wireless multi-media broadcast signal.
Fig. 2 is to use many audio streams implementation method of mobile multimedia broadcast system of the present invention to realize the schematic diagram of 2 audio streams.Audio frequency paragraph header and synchronous head have been omitted among the figure.Suppose that first audio stream has 15 audio units, the 2nd audio stream has 10 audio units, as shown in Figure 2, the 1st audio stream comprises: 1,3,5,7,9,11,13,15,17,19,21,22,23,24,25, the 2 audio streams of audio unit comprise: audio unit 2,4,6,8,10,12,14,16,18,20.Among the figure, there is synchronous head to cut apart each audio unit between each audio unit.
The audio unit of 2 audio streams can not exclusively be arranged according to above-mentioned order, and its order can be adjusted flexibly.
According to mentioned above principle, can realize that 1 audio stream, 2 audio streams or the audio stream more than 2 transmit simultaneously in the one or more data channel that channel distributed.
For example, comprise under the situation of 2 audio streams at 1 channel, each business datum has the speed of 256Kbit/s.
Wherein: long 122 bytes of paragraph header, video data has the 22.5K byte, audio frequency segment length 8K byte, data segment length 1K byte for the part of not enough 32K byte, can fill complete 0.Audio section comprises 2 audio streams, and each audio stream has 32Kbit/s.Compare the efficient that has improved transmission greatly with the TS mode.
Such channel, can satisfy the transmission of the video data of the H264 of 1 QVGA resolution, 25 frames or AVS-M, with the transmission of the AAC audio stream data of 2 32Kbit/s, can provide mobile broadcast television program to the user with quite satisfied high quality audio stream.
Claims (4)
1. the audio stream transport method of a mobile multimedia broadcast system comprises the steps:
(1) will need the unified numbering of the audio stream that transmits, each audio stream has unique number;
(2) each audio stream is divided into a plurality of audio units, and audio unit is encapsulated in the audio section, with the length of each audio unit, audio stream numbering, reproduction time is recorded in the audio frequency paragraph header relatively;
(3) audio section and other data encapsulation that need transmit are transmitted in a service channel;
(4) after terminal receives audio section, take out each audio stream, carry out the broadcast of audio stream according to length, the audio stream numbering of each audio unit in the audio frequency paragraph header.
2. the audio stream transport method of mobile multimedia broadcast system as claimed in claim 1 is characterized in that, described audio frequency paragraph header also comprises check code.
3. the audio stream transport method of mobile multimedia broadcast system as claimed in claim 1 is characterized in that, adds synchronous head between described each audio unit and does isolation.
4. the audio stream transport method of mobile multimedia broadcast system as claimed in claim 1 is characterized in that, the data in the described service channel also comprise the subframe head, and described subframe head comprises the length of audio section and the parameter of audio section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2006101571655A CN1972166B (en) | 2006-11-30 | 2006-11-30 | An audio stream transport method of mobile multimedia broadcast system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101571655A CN1972166B (en) | 2006-11-30 | 2006-11-30 | An audio stream transport method of mobile multimedia broadcast system |
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| CN1972166A CN1972166A (en) | 2007-05-30 |
| CN1972166B true CN1972166B (en) | 2011-05-25 |
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| CN2006101571655A Expired - Fee Related CN1972166B (en) | 2006-11-30 | 2006-11-30 | An audio stream transport method of mobile multimedia broadcast system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102171B (en) * | 2007-06-21 | 2010-06-09 | 中兴通讯股份有限公司 | A data processing method of mobile multi-media terminal |
| CN107786490B (en) * | 2016-08-24 | 2021-08-24 | 中兴通讯股份有限公司 | Media information packaging method and device and packaging file analysis method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455597A (en) * | 2002-04-29 | 2003-11-12 | 深圳市中兴通讯股份有限公司 | Motion image expert group-2 transimitting flow transmitting method |
| CN1754364A (en) * | 2003-02-28 | 2006-03-29 | 索尼株式会社 | Transmission/reception system, transmitting device and method, and receiving device and method |
| CN1863314A (en) * | 2005-10-17 | 2006-11-15 | 华为技术有限公司 | Method for real-time transmitting H.264 multimedia data |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455597A (en) * | 2002-04-29 | 2003-11-12 | 深圳市中兴通讯股份有限公司 | Motion image expert group-2 transimitting flow transmitting method |
| CN1754364A (en) * | 2003-02-28 | 2006-03-29 | 索尼株式会社 | Transmission/reception system, transmitting device and method, and receiving device and method |
| CN1863314A (en) * | 2005-10-17 | 2006-11-15 | 华为技术有限公司 | Method for real-time transmitting H.264 multimedia data |
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