CN101340251A - Method and network for realizing audio and video stream media service - Google Patents
Method and network for realizing audio and video stream media service Download PDFInfo
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- CN101340251A CN101340251A CNA2008101185175A CN200810118517A CN101340251A CN 101340251 A CN101340251 A CN 101340251A CN A2008101185175 A CNA2008101185175 A CN A2008101185175A CN 200810118517 A CN200810118517 A CN 200810118517A CN 101340251 A CN101340251 A CN 101340251A
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Abstract
The invention discloses a method used for realizing audio and video stream media service and a network thereof. In the implementation scheme of the invention, a lateral terminal of a system sends the audio and video stream media service transmitted in a flow pattern and provides corresponding session description protocol SDP files; a terminal receives the audio and video stream media service transmitted in a flow pattern, and according to the corresponding SDP files provided by the system in the side direction, the received audio and video stream media service is analyzed; therefore, the terminal can correctly analyze the audio and video stream media service multiplexed and transmitted on a data segment, the development and the popularization of CMMB service are facilitated and user experience is improved. In addition, the invention also provides a plurality of transmission modes of the SDP files; for example, the service parameter element of present ESG or CMMB portal navigation can be used without major changes, and the invention has the advantages that the realization is simple and the choice is flexible according to actual situations.
Description
Technical field
The present invention relates to China Mobile multimedia broadcasting (CMMB, China Mobile MultimediaBroadcasting) field, be meant a kind of method and network of realizing audio and video stream media service especially.
Background technology
CMMB has stipulated in the broadcasting service frequency range, frame structure, chnnel coding and the modulation system of mobile multimedia broadcast system broadcast channel transmission signals, this standard is applicable to that 30MHz is to the interior broadcasting service frequency of 3000MHz scope, via satellite and/or the broadcast system of multi-media signals such as terrestrial wireless emission TV, broadcasting, data message, can realize whole nation roaming.
The CMMB data broadcasting comprises stream mode and file mode dual mode.If data service need represent in the mode of Continuous Flow, there are sequential requirement, the free label indication of transmission or data flow inside that synchronous requirement is arranged usually, can adopt this moment stream mode to handle.If data service need represent in the mode of discrete data file, not have sequential usually and require, transmit no time tag indication or the inner no synchronous requirement of data flow, can adopt file mode to handle this moment.
The CMMB business is stipulated the audio/video coding parameter of TV programme and broadcast program: H.264 the television program video coding adopts, and audio coding adopts Advanced Audio Coding (AAC+, Adaptive AudioCoding+); The audio broadcasting program adopts digital audio encoding and decoding (DRA) standard.Audio, video data adopts RTP (RTP, Real-time Transport Protocol)/User Datagram Protoco (UDP) (UDP, User Datagram Protocol)/Internet protocol (IP) protocol encapsulation.After the audio/video coder configuration, can generate a Session Description Protocol (SDP, Session Description Protocol) file, be used to describe the form of audio frequency and video initiation parameter, mainly comprise session information and media information.Wherein, session information mainly comprises: the bandwidth information that session name and purpose, session activation time, session are used and the contact details of session leader; Media information mainly comprises: medium type, as video, audio frequency; Host-host protocol is as RTP/UDP/IP, H.320; Media formats is as H.264 video, AAC+ audio frequency; The multicast address and the media delivery port that are used for the ip multicast session; Be used for the medium of IP unicast session contact address and the far-end address of transmit port.SDP file is made up of many line of text, and the form of line of text is generally＜type 〉=＜value 〉, wherein,＜type〉be a letter,＜value〉be structurized text string, its form is complied with＜type〉and decide.
At present, the audio and video stream media service in the CMMB business can multiplexingly transmit on data segment, and the mode by the stream mode data broadcasting realizes.When adopting this mode, multiplexer directly is encapsulated into the audio frequency and video IP/UDP/RTP bag that receives transparent transmission in the data segment of multiplexed sub frame by Extended Protocol encapsulation (XPE, eXtendable Protocol Encapsulation).
Audio and video stream media service adopts stream mode, it is multiplexing when transmitting on data segment to be, after terminal receives audio and video stream media service, existing but do not have prescribed terminal how audio and video stream media service to be resolved, cause terminal correctly to resolve and to play, influenced user's experience the audio frequency and video business that receives.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and network of realizing audio and video stream media service, and the assurance terminal can be resolved the audio and video stream media service that adopts the stream mode transmission.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that realizes audio and video stream media service, this method comprises:
A, terminal receive the audio and video stream media service that adopts the stream mode transmission, and the Session Description Protocol SDP file of the correspondence that provides according to system side is resolved the audio and video stream media service of receiving.
Further comprise before the described steps A:
A0, system lateral terminal provide the SDP file corresponding to described audio and video stream media service.
Described SDP file is carried in the business parameters data of electron service instruction ESG; The SDP file of the correspondence that provides according to system side described in the steps A is resolved the audio and video stream media service of receiving, comprise: the corresponding relation of service identification that comprises in the business information according to ESG and the sign of the service parameter in the business parameters data, determine corresponding SDP file, according to this SDP file the audio and video stream media service of receiving is resolved then.
Described SDP file is carried on the navigation of China Mobile multimedia broadcasting CMMB door; The SDP file of the correspondence that provides according to system side described in the steps A is resolved the audio and video stream media service of receiving, comprise: obtain SDP file according to the described SDP file path in the navigation of CMMB door, according to this SDP file the audio and video stream media service of receiving is resolved then.
Describedly the audio and video stream media service of receiving is resolved according to SDP file, comprise: obtain the audio, video data bag, address information according to packet header of address information in the SDP file and audio, video data bag, determine corresponding audio, video data bag, according to the audio/video coding parameter that defines in the SDP file, the audio, video data bag is decoded and play.
A kind of method that realizes audio and video stream media service, this method comprises: the system lateral terminal sends the audio and video stream media service that adopts the stream mode transmission, and corresponding Session Description Protocol SDP file is provided.
The described Session Description Protocol SDP file that correspondence is provided, comprising: system side will be carried among the ESG corresponding to the SDP file of described audio and video stream media service.
Described being carried among the ESG, for: be carried in the business parameters data of ESG.
Described business parameters data is the service parameter element in the business parameters data, and this method comprises: system side is directly with the value of SDP file as the service parameter element; Perhaps, the pre-defined conversation description data type of system side when sending SDP file, is each element of conversation description data type with each parameter-definition in the SDP file as the data type of service parameter element.
The described Session Description Protocol SDP file that correspondence is provided comprises: system side will be carried on the navigation of China Mobile multimedia broadcasting CMMB door corresponding to the SDP file of described audio and video stream media service.
The service chaining address of described CMMB door navigation includes the SDP file path at least, and the SDP file that is used to describe corresponding to audio and video stream media service is deposited the relative path in path with respect to homepage file this locality of CMMB door navigation.
A kind of network of realizing audio and video stream media service comprises: system side and terminal, and wherein, system side is used for sending the audio and video stream media service that adopts the stream mode transmission to terminal, and corresponding Session Description Protocol SDP file is provided; Terminal is used for according to described SDP file the audio and video stream media service that the employing stream mode of receiving transmits being resolved.
Described system side is used for that described SDP file is carried on ESG or the navigation of CMMB door offers terminal.
Among the present invention, terminal receives the audio and video stream media service that adopts the stream mode transmission, the SDP file of the correspondence that provides according to system side is resolved the audio and video stream media service of receiving, make terminal correctly to resolve to the multiplexing audio and video stream media service that on data segment, transmits, be beneficial to the development and the popularization of CMMB business, promoted user experience.
In addition, also provide the transmission means of multiple SDP file in the solution of the present invention, for example, can utilize service parameter element or the navigation of CMMB door among the existing ESG, all need not on existing basis, to do bigger change, realize simply, and can select flexibly according to actual conditions.
Description of drawings
Fig. 1 realizes correct receiving media data flow chart for the present invention;
Fig. 2 is a business parameters data data structure schematic diagram;
Fig. 3 is a business parameters data dtd schematic diagram;
Fig. 4 is the Schema structural representation of conversation description data type.
Embodiment
The present invention is in CMMB, and terminal receive to adopt the audio and video stream media service of stream mode transmission, and the SDP file of the correspondence that provides according to system side is resolved the audio and video stream media service of receiving.Adopt the audio and video stream media service of stream mode transmission to be the multiplexing audio and video stream media service that on data segment, transmits,
Fig. 1 realizes correct receiving media data flow chart for the present invention, as shown in Figure 1, realizes that the processing procedure of correct receiving media data may further comprise the steps:
Step 101: the system lateral terminal sends the audio and video stream media service that adopts the stream mode transmission, and provides corresponding SDP file to terminal.
Step 102: terminal is resolved the audio and video stream media service of receiving according to the SDP file of correspondence.
System side can be carried on SDP file in the electron service instruction (ESG, Electronic ServiceGuide), further, SDP file can be carried in the business parameters data of ESG, by the ESG that issues SDP file is offered terminal then; Also can be carried in the navigation of CMMB door by SDP file, the CMMB door navigation that will carry SDP file then offers terminal.Specific implementation of the present invention is described below in more detail.
ESG is set in the ESG standard of CMMB comprises five kinds of data messages: business information, professional extend information, arrangement information, content information and business parameters data.Wherein the data structure of business parameters data as shown in Figure 2, service parameter sign (ServiceParaID) is used to describe the service parameter attribute of an element, is unique sixteen bit signless integer; Service parameter type (ServiceParaType) is used to describe the data type of service parameter element; Service parameter element (Para) is used for the particular content of bearer service parameter, and concrete business parameters data dtd as shown in Figure 3.
Keep the service parameter element in the CMMB business at present, it has not been carried out specific definition.Therefore, can usually carry SDP file by service parameter unit in the implementation of the present invention, so that system side offers terminal by the service parameter element among the ESG that issues with SDP file.
During by service parameter element carrying SDP file, can directly the particular content of SDP file as the service parameter element be filled in the service parameter element, promptly directly with the value of SDP file as the service parameter element; Also can carry out pre-defined to service parameter element data type, define a conversation description data type, when sending SDP file, with various parameter-definitions relevant in the SDP file is each element of conversation description data type, and the each several part with SDP file carries as the value of each element then.The conversation description dtd is as follows:
The conversation description data type has been described the content of SDP file, and its Schema structure, syntax and semantics are described below:
● structure:
The Schema structure of conversation description data type is as shown in Figure 4:
● grammer:
The syntactic definition of conversation description data type is as follows:
<complexType?name＝″SDPType″>
<sequence>
<element?name＝″v″type＝″string″/>
<element?name＝″o″type＝″string″/>
<element?name＝″s″type＝″string″/>
<element?name＝″t″type＝″string″maxOccurs＝″unbounded″/>
<element?name＝″c″type＝″string″minOccurs＝″0″/>
<element?name＝″u″type＝″string″minOccurs＝″0″/>
<element?name＝″e″type＝″string″minOccurs＝″0″/>
<element?name＝″p″type＝″string″minOccurs＝″0″/>
<element?name＝″z″type＝″string″minOccurs＝″0″/>
<element?name＝″k″type＝″string″minOccurs＝″0″/>
<element?name＝″MediaDesc″type＝″string″minOccurs＝″0″/>
<complexType>
<sequence>
<element?name＝″m″type＝″string″maxOccurs＝″unbounded″/>
<element?name＝″b″type＝″string″minOccurs＝″0″maxOccurs＝″unbounded″/>
<element?name＝″a″type＝″string″minOccurs＝″0″maxOccurs＝″unbounded″/>
</sequence>
</complexType>
</element>
</sequence>
<attribute?name＝″lang″type＝″string″default＝″zho″/>
</complexType>
● semanteme
The semantical definition of conversation description data type such as following table:
| Field | Semantic |
| v | The version number of SDP agreement |
| o | Indicated the overall uniqueness of this session |
| s | Session name, each session only have one |
| t | Describe the start and end time of this meeting,, can use multirow t in a plurality of irregular time intervals: describe if this meeting activates. |
| c | Connect data, each session bulletin should comprise a connection and be described in each media description.For example: c=IN IP4 224.2.17.12/127 |
| u | The URI of this session (Universal Resource Identifier) address |
| e | The email information of session leader |
| p | The phone information of session leader |
| z | The time zone is adjusted |
| k | Encryption key |
| i | Session information, each session have one at the most, and each medium has one at the most, are usually used in identifying a plurality of Media Streams of the same type in the session. |
| MediaDesc | The medium property descriptive element |
| m | Media description |
| a | Attribute.This description often is used to expand the SDP agreement, is divided into " session level " and " media-level " two kinds of attributes. |
| b | The bandwidth of this session is provided |
For example: a SDP file thes contents are as follows:
v＝0
o＝cmmbtest?14278108689883646IN?IP4?172.16.10.68
s＝Profile?1
c＝IN?IP4?172.16.10.186
t＝00
m＝video?55030?RTP/AVP?96
b＝AS:395
b＝TIAS:375808
b＝RS:3000
b＝RR:0
a＝rtpmap:96H264/90000
a＝fmtp:96 profile-level-id＝42E00D；sprop-parameter-sets＝Z0LgDZZSAoP0kAg＝，aM44gA＝；
packetization-mode＝1
a＝cliprect:0，0，240，320
a＝framerate:25.
a＝mpeg4-esid:201
a＝X-initpredecbufperiod:90131
a＝X-predecbufsize:49408
a＝X-initpostdecbufperiod:0
a＝X-decbyterate:49336
a＝x-envivio-verid:00023014
a＝maxprate:59.
m＝audio?55032RTP/AVP?97
b＝AS:41
b＝TIAS:33500
b＝RS:513
b＝RR:0
a＝rtpmap:97MP4A-LATM/48000/2
a＝fmtp:97profile-level-id＝15；object＝2；cpresent＝F0；config＝400026203FC0；SBR-enabled＝1
a＝mpeg4-esid:101
a＝lang:eng
a＝x-envivio-verid:00023014
a＝maxprate:23.4375
According to the definition of Session Description Protocol data type, carry the business parameters data of above SDP file
The XML file content is as follows:
<？xml?version＝″1.0″encoding＝″UTF-8″standalone＝″yes″？>
<esg:ESGDATA?xmlns:esg＝″urn:cmmb:esg:2007″xmlns:xsi＝″http://www.w3.org/2001/XMLSchema-instance″Ver＝″1.0″>
<ServicePara?ServiceParaID＝″1″>
<Para?lang＝″zho″>
<v>0</v>
<o>cmmbtest?1427810868?9883646?IN?IP4?172.16.10.68</o>
<s>Profile?1</s>
<t>00</t>
<c>IN?IP4?172.16.10.186</c>
<MediaDesc>
<m>video?55030RTP/AVP?96</m>
<b>AS:395</b>
<b>TIAS:375808</b>
<b>RS:3000</b>
<b>RR:0</b>
<a>rtpmap:96H264/90000</a>
<a>fmtp:96prpfile-level-id＝42E00D；sprop-parameter-sets＝Z0LgDZZSAoP0kAg＝，aM44gA＝；
packetization-mode＝1</a>
<a>cliprect:0，0，240，320</a>
<a>framerate:25.</a>
<a>mpeg4-esid:201</a>
<a>X-initpredecbufperiod:90131</a>
<a>X-predecbufsize:49408</a>
<a>X-initpostdecbufperiod:0</a>
<a>X-decbyterate:49336</a>
<a>x-envivio-verid:00023014</a>
<a>maxprate:59.</a>
</MediaDesc>
<MediaDesc>
<m>audio?55032RTP/AVP?97</m>
<b>AS:41</b>
<b>TIAS:33500</b>
<b>RS:513</b>
<b>RR:0</b>
<a>rtpmap:97MP4A-LATM/48000/2</a>
<a>fmtp:97profile-level-id＝15；object＝2；cpresent＝0；config＝400026203FC0；SBR-enabled＝1</a>
<a>mpeg4-esid:101</a>
<a>lang:eng</a>
<a>x-envivio-verid:00023014</a>
<a>maxprate:23.4375</a>
</MediaDesc>
</Para>
</ServicePara>
</esg:ESGDATA>
After terminal is received ESG, owing to include service identification in the business information of ESG, and this service identification and service parameter sign have corresponding relation, like this, terminal just can be obtained SDP file corresponding to the audio and video stream media service of receiving by ESG, according to rule being set or syntactic definition restores SDP file; Terminal is resolved audio and video stream media service according to this SDP file then.Detailed process is as described below:
Terminal receives in stream mode data broadcasting mode multiplexing when the audio/video program of data segment, at first separate the XPE encapsulation, obtain IP/UDP/RTP audio, video data bag, by technology such as Microsoft Loopback Adapters IP/UDP/RTP audio, video data bag is sent to the ICP/IP protocol stack of terminal then.Wherein, the IP packet header of audio, video data bag is used to refer to the source address and the destination address of this audio, video data bag, and UDP indicates in packet header this audio, video data bag source and destination port.Because the media information in the SDP file has comprised the purpose IP address and the destination interface of audio, video data, terminal just can find the corresponding audio, video data bag of program according to purpose IP address and port from the ICP/IP protocol stack, send player to, simultaneously player can be according to the audio/video coding parameter that defines in the SDP file, and the audio, video data bag is decoded and play.
System side also can be by CMMB door navigation carrying SDP file.Stipulated door airmanship in the CMMB business based on HTML (HTML, Hypertext Markup Language) webpage.
For the user provides business to browse and the operation interface of Operational Visit is made up of html web page, between the html web page by standard uniform resource locator (URL, Uniform Resource Location) link carrying out association.For professional visit such as television broadcasting, sound radio, file broadcasting, data flow broadcasting, identify by in standard URL link, adding the specific attribute parameter, just can trigger corresponding service processing.
Constitute all html web page files of the operation interface of terminal, be pushed to terminal by broadcast channel with the form of data broadcasting, receive and storage by terminal, present processing by the built-in browser of terminal then, like this, terminal use's operation interface is the html web page form, provides the user to browse and operates, thereby realize the consistency of terminal use's operation interface.
According to above description as seen, switch between different business in order to make terminal, added the specific attribute parameter in the service chaining address of html web page file and identified, to visual broadcast service, sound broadcasting service and data flow broadcasting service, the concrete syntax form is as follows:
＜a href="? ServiceID=Ye Wubiaoshi ﹠amp; The ServiceClass=type of service "〉Business Name＜/a 〉
Therefore, SDP file can be carried among the present invention in the navigation of CMMB door, transmit according to the file mode data broadcasting.For the multiplexing audio and video stream media service that on data segment, transmits, its service chaining address syntax format to be expanded, concrete form is as follows:
＜a href="? ServiceID=Ye Wubiaoshi ﹠amp; ServiceClass=Ye Wuleixing ﹠amp; The SDP=SDP file path "〉Business Name＜/a 〉
This shows, increased the SDP file path in the service chaining address, the SDP file that is used to describe corresponding to audio and video stream media service is deposited the relative path in path with respect to homepage file this locality of CMMB door navigation.Like this, just will adopt the audio and video stream media service of stream mode transmission to be mapped with corresponding SDP description document by the SDP file path, terminal can obtain SDP file corresponding to audio and video stream media service according to the SDP file path, the concrete processing procedure of audio and video stream media service being resolved according to SDP file, processing when being carried on ESG with SDP file is identical, does not repeat them here.
In the network of realization audio and video stream media service provided by the invention, comprise system side and terminal, wherein, system side is used for sending the audio and video stream media service that adopts the stream mode transmission to terminal, and corresponding SDP file is provided; Terminal is used for according to described SDP file the audio and video stream media service that the employing stream mode of receiving transmits being resolved.
System side can be carried on SDP file in ESG or the navigation of CMMB door; Further, system side can be carried on SDP file in the business parameters data of ESG.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (13)
1, a kind of method that realizes audio and video stream media service is characterized in that, this method comprises:
A, terminal receive the audio and video stream media service that adopts the stream mode transmission, and the Session Description Protocol SDP file of the correspondence that provides according to system side is resolved the audio and video stream media service of receiving.
2, method according to claim 1 is characterized in that, further comprises before the described steps A:
A0, system lateral terminal provide the SDP file corresponding to described audio and video stream media service.
3, method according to claim 1 is characterized in that,
Described SDP file is carried in the business parameters data of electron service instruction ESG;
The SDP file of the correspondence that provides according to system side described in the steps A is resolved the audio and video stream media service of receiving, comprise: the corresponding relation of service identification that comprises in the business information according to ESG and the sign of the service parameter in the business parameters data, determine corresponding SDP file, according to this SDP file the audio and video stream media service of receiving is resolved then.
4, method according to claim 1 is characterized in that,
Described SDP file is carried on the navigation of China Mobile multimedia broadcasting CMMB door;
The SDP file of the correspondence that provides according to system side described in the steps A is resolved the audio and video stream media service of receiving, comprise: obtain SDP file according to the described SDP file path in the navigation of CMMB door, according to this SDP file the audio and video stream media service of receiving is resolved then.
5, according to the arbitrary described method of claim 1 to 4, it is characterized in that, describedly the audio and video stream media service of receiving is resolved according to SDP file, comprise: obtain the audio, video data bag, address information according to packet header of address information in the SDP file and audio, video data bag, determine corresponding audio, video data bag,, the audio, video data bag is decoded and play according to the audio/video coding parameter that defines in the SDP file.
6, a kind of method that realizes audio and video stream media service is characterized in that, this method comprises:
The system lateral terminal sends the audio and video stream media service that adopts the stream mode transmission, and corresponding Session Description Protocol SDP file is provided.
7, method according to claim 6 is characterized in that, the described Session Description Protocol SDP file that correspondence is provided, and comprising: system side will be carried among the ESG corresponding to the SDP file of described audio and video stream media service.
8, method according to claim 7 is characterized in that, described being carried among the ESG, for: be carried in the business parameters data of ESG.
9, method according to claim 8 is characterized in that, described business parameters data is the service parameter element in the business parameters data, and this method comprises:
System side is directly with the value of SDP file as the service parameter element; Perhaps,
The pre-defined conversation description data type of system side when sending SDP file, is each element of conversation description data type with each parameter-definition in the SDP file as the data type of service parameter element.
10, method according to claim 6 is characterized in that, the described Session Description Protocol SDP file that correspondence is provided comprises: system side will be carried on the navigation of CMMB door corresponding to the SDP file of described audio and video stream media service.
11, method according to claim 10, it is characterized in that, the service chaining address of described CMMB door navigation includes the SDP file path at least, and the SDP file that is used to describe corresponding to audio and video stream media service is deposited the relative path in path with respect to homepage file this locality of CMMB door navigation.
12, a kind of network of realizing audio and video stream media service is characterized in that, comprising: system side and terminal, wherein,
System side is used for sending the audio and video stream media service that adopts the stream mode transmission to terminal, and corresponding Session Description Protocol SDP file is provided;
Terminal is used for according to described SDP file the audio and video stream media service that the employing stream mode of receiving transmits being resolved.
13, system according to claim 12 is characterized in that, described system side is used for that described SDP file is carried on ESG or the navigation of CMMB door offers terminal.
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|---|---|---|---|
| CNA2008101185175A CN101340251A (en) | 2008-08-15 | 2008-08-15 | Method and network for realizing audio and video stream media service |
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| CNA2008101185175A CN101340251A (en) | 2008-08-15 | 2008-08-15 | Method and network for realizing audio and video stream media service |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274682A (en) * | 2018-10-26 | 2019-01-25 | 西安科锐盛创新科技有限公司 | Data processing method and its equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274682A (en) * | 2018-10-26 | 2019-01-25 | 西安科锐盛创新科技有限公司 | Data processing method and its equipment |
| CN109274682B (en) * | 2018-10-26 | 2021-03-05 | 上海营湾医疗科技有限公司 | Data processing method and apparatus thereof |
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