CN101179736A - Method for converting transmission stream program to China mobile multimedia broadcasting program - Google Patents

Method for converting transmission stream program to China mobile multimedia broadcasting program Download PDF

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CN101179736A
CN101179736A CN 200610138262 CN200610138262A CN101179736A CN 101179736 A CN101179736 A CN 101179736A CN 200610138262 CN200610138262 CN 200610138262 CN 200610138262 A CN200610138262 A CN 200610138262A CN 101179736 A CN101179736 A CN 101179736A
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program
transport stream
elementary stream
china mobile
step
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CN101179736B (en
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张建强
文海龙
晏祥彪
嵘 李
灿 沈
王志英
军 陈
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中兴通讯股份有限公司
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Abstract

本发明公开了一种传输流节目转换成中国移动多媒体广播节目的方法,包括如下步骤:读取节目相关表和节目对应表,获取对应节目的传输流包,并在缓冲区中排序,从传输流包中取出打包基本码流包;当传输流组成一个完整的打包基本码流时,从运动图像专家组传输流包中取出打包基本码流包,把打包基本码流扩展包头中的展现时间戳或解码时间戳取出,转换成复用帧中的时间戳;取出打包基本码流中的基本流包,按照中国移动多媒体广播复用协议的要求,将视频基本流包填入视频单元,或者将音频基本流包填入音频单元,在设定时间内形成一个复用帧;封装复用帧并发送。 The present invention discloses a method for converting a transport stream to a program China Mobile Multimedia Broadcasting program, comprising the steps of: reading a program association table and program map table, obtaining a transport stream packet corresponding to the program, and sorted in the buffer, the transmission from the Packetized Elementary stream packet extraction stream packet; when a transport stream consisting of packetized elementary stream complete, the motion picture Experts Group transport stream packets packetized elementary stream packet removed, the extended elementary stream pack header presentation time decoding time stamp or stamp removed, converted into a multiplex frame time stamp; packetized elementary stream extracted elementary stream packet in accordance with the requirements of China mobile multimedia broadcasting multiplex protocol, the video elementary stream packet is filled video units, or the audio elementary stream packet audio unit is filled, forming a complex within a set time frame; encapsulating multiplexing frame and transmitted.

Description

一种传输流节目转换成中国移动多媒体广播节目的方法 A transport stream to a program conversion China Mobile Multimedia Broadcasting program method

技术领域 FIELD

本发明涉及一种移动多媒体广播或手机电视技术,具体说,涉及一种传输流节目转换成中国移动多^!某体广播节目的方法。 The present invention relates to a mobile phone or a mobile multimedia broadcast television technology, particularly, relates to a program converting a transport stream China Mobile Multi ^! Method of a broadcast program body.

背景技术 Background technique

移动多媒体广播是近年来兴起的一种多媒体播放技术。 Mobile Multimedia Broadcasting is a multimedia playback technology rising in recent years. 通过手持的终端,在高速移动的情况下,可以观看电视。 Via hand-held terminal, in the case of fast-moving, you can watch TV. 终端通过无线协议,接收到节目单,并可以选择自己有权利收看的频道,从而可以接受选择频道的多媒体数据,实现在移动终端上看电视。 Terminal through a wireless protocol, a single program is received, and can choose the right viewing channel, so that the multimedia data can accept channel selection, implemented in a mobile terminal, watching TV.

系统发射的空中数据,被分成不同的频道,每个频道的数据又包括:视频、音频和辅助数据三种类型,终端可以接收相关的数据,通过终端上的播放器,实现电视的正常播放。 Air data transmission system, is divided into different channels, each channel also includes data: video, audio and auxiliary data of three types, the terminal may receive related data on the terminal by the player, TV achieve normal play.

空中发射的数据格式有多种复用方法,不同的复用方法之间需要做格式转换,现在主要的复用方法有: Air-launched a variety of data formats multiplexing method, you need to do format conversion between different multiplexing method, now the main multiplexing method are:

第一,TS (传输流)方式,TS协议是MPEG (运动图像专家组)标准中的一种,它把辅助数据、视频、音频放在一个固定188字节大小的TS包里传送,TS包中包括了每个数据块的播放时间,以保证视频音频的正常播放。 First, TS (transport stream) mode, TS protocol is a MPEG (Moving Picture Experts Group) standard, to which the auxiliary data, video, audio in a fixed-size 188-byte transport bag TS, TS packets playback time is included in each data block to ensure that the normal video and audio playback.

第二, RTP(实时传输协议)方式,是在IP网络传送辅助数据、视频、 音频数据的方法,包的大小不固定,通过每个包头的时戳来保证播放的时间同步,通过序列号来保证包的播放次序。 Second, the RTP (Real-time Transport Protocol) mode, is a method IP network assistance data, video, audio, data, packet size is not fixed, to ensure that the time stamps synchronized by playing each header, by serial number ensure the order of play package.

但是,在现有广播电视网络中不能够实现TS节目直接转换成CMMB(中国移动多媒体广播)节目。 However, the program can not be achieved in the existing TS broadcast television network in the direct conversion into CMMB (China Mobile Multimedia Broadcasting) program. 发明内容 SUMMARY

本发明所解决的技术问题是提供一种传输流节目转换成中国移动多媒 The technical problem solved by the present invention is to provide a conversion program transport stream into a China Mobile Multimedia

体广播节目的方法,在现有设备上将TS节目直接转换成CMMB复用协议的节目。 The method of broadcast program body, conversion of existing equipment on TS shows directly into the program CMMB multiplex protocol.

技术方案如下: Technical solutions are as follows:

一种传输流节目转换成中国移动多媒体广播节目的方法,包括如下步 A transport stream to a program conversion China Mobile Multimedia broadcasting program, comprising the following steps

骤: Step:

(1) 读取节目相关表和节目对应表,获取对应节目的传输流包,并在緩冲区中排序,从传输流包中取出打包基本码流包; (1) reads the program association table and program map table, obtaining the corresponding program transport stream packet, in the buffer and sort, removed from the transport stream packets packetized elementary stream packet;

(2) 当传输流组成一个完整的打包基本码流时,从运动图像专家组传输流包中取出打包基本码流包,把打包基本码流扩展包头中的展现时间戳或解码时间戳取出,转换成复用帧中的时间戳; (2) When a transport stream consisting of packetized elementary stream complete, the Motion Picture Experts Group Transport Stream packets packetized elementary stream packet extracted, the packetized elementary stream header extension decoding time stamp or the presentation time stamp removed, converted into a multiplex frame time stamp;

(3) 取出打包基本码流中的基本流包,按照中国移动多媒体广播复用协议的要求,将视频基本流包填入视频单元,或者将音频基本流包填入音频单元,在设定时间内形成一个复用帧; (3) Remove the packetized elementary stream packets of the elementary stream, as required by China Mobile Multimedia Broadcasting multiplex protocol, the video elementary stream packet unit is filled video or audio elementary stream packets fill the audio unit, the set time forming within a multiplex frame;

(4) 封装复用帧并发送。 (4) encapsulated multiplexing frame and transmitted.

进一步,步骤(l)中,依据传输流中的分组标识,把传输流中的视频打包基本码流包或者音频打包基本码流包分别提取出来。 Further, the step (l), the transport stream packet based on the identification, the transport stream of the video packetized elementary stream packet or an audio packetized elementary stream packet are extracted.

进一步,步骤(2)中,所述时间戳用于设定^f见频数据或者音频数据的显示时间,实现视频或者音频播放的同步。 Further, the step (2), the time stamp for setting the display time ^ f see audio data or audio data, synchronized playback of video or audio.

进一步,步骤(3)进一步包括: Further, step (3) further comprises:

根据复用帧中的时间戳判断设定时间内的数据封装是否结束;如果设定时间内的数据封装结束,执行步骤(4),否则,执行步骤(1)。 Data encapsulation within a set time according to the time stamp judging whether or not the end of the multiplexing frame; if the setting data package in the end time, step (4), otherwise, perform step (1).

进一步,步骤(3)中,所述设定时间为0.25秒、0.5秒或者1秒。 Further, step (3), the set time is 0.25 seconds, 0.5 seconds or 1 second.

进一步,步骤(4)中,所述复用帧的长度为32K字节。 Further, the step (4), the multiplex frame length of 32K bytes.

进一步,步骤(4)进一步包括:当复用帧封装完成后,执行步骤(l)。 Further, the step (4) further comprising: a multiplexing frame when the packaging is finished, step (l).

本发明技术方案把TS复用方式的节目转换成CMMB (中国移动多媒体广播)标准规定的复用方式的节目,并能转换不同的视频压缩算法与音频压 Aspect of the invention converts the TS multiplexed into a program mode of the CMMB standard program (China Mobile Multimedia Broadcasting) multiplexing scheme, and to convert different audio compression and video compression algorithms

缩算法,实现了TS节目直接转换成CMMB节目的功能,保护了现有TS的设备。 Reduction algorithm, the program directly converted into TS CMMB program functions to protect the device prior to TS.

附图说明 BRIEF DESCRIPTION

图1是MPEG传输流PES包转换到复用帧的示意图图2是H.264的MPEG传输流转换成H.264复用帧的示意图; 图3是H.264的MPEG传输流转换成AVS复用帧的示意图; 图4是MPEG传输流转换到复用帧的流程图。 FIG 1 is a MPEG transport stream packets into PES to the multiplexing frame 2 is a schematic diagram of an MPEG transport stream into H.264 H.264 multiplex frame; FIG. 3 is an MPEG transport stream to the H.264 multiplexing AVS schematically frame; FIG. 4 is a flowchart of converting the MPEG transport stream to the multiplexing frame.

具体实施方式 Detailed ways

如图1所示,TS到复用帧的转换是依据TS中的PID (分组标识)把TS流中的视频PES (打包基本码流)包和音频PES (打包基本码流)包分别提取出来,再去掉PES头,取出ES(基本流)包,重新打包成复用帧中的视频数据单元、音频数据单元,通常1个PES包可以分成1个或多个视频数据单元、音频数据单元。 As shown, the TS multiplexing frame conversion is based on the PID of the TS (packet identification) of the TS stream video PES (Packetized Elementary Stream) packet and an audio PES (Packetized Elementary Stream) packets are extracted 1 , then the PES header is removed, remove the ES (elementary stream) packets, re-packaged into a multiplex frame unit of the video data, audio data units, typically one PES packet may be divided into one or more units of video data, audio data units. 同时,把PES的Option头的PTS (展现时间戳)或者DTS (解码时间戳)对应转换成视频数据块和音频数据块的显示时间,从而实现;现频和音频4番;改的同步。 Meanwhile, the PTS Option header of the PES (presentation time stamp) or DTS (Decoding Time Stamp) is converted into the corresponding block of video data and audio data presentation time block, in order to achieve; 4 Fan current video and audio; synchronous change.

如图2所示,编码器输出H.264的传输流,送给转码器,转码器不需要转换信源压缩算法,但是需要做传输流到复用协议的转换。 2, the encoder outputs the H.264 transport stream, to the transcoder, transcoder no conversion source compression algorithm, but do need to convert the multiplexed transport stream protocol.

如图3所示,编码器输出H.264的传输流,送给转码器,转码器需要把H.264转换成AVS (先进视音频编解码算法)编码算法,还需要做传输流到复用协议的转换。 3, the encoder outputs the H.264 transport stream, to the transcoder, transcoder needs to be converted into the AVS H.264 (advanced audio coding algorithm) coding algorithm, a transport stream needs to be done multiplexing protocol conversion.

图2和图3中的转码器是一个独立的设备,也可以是一个设备中的模块。 FIG 2 and FIG 3 transcoder is an independent device, or may be a device module. 转码器用于完成协议转换的功能,可选完成信源压缩算法的转换功能。 Transcoder for performing protocol conversion functions, the optional conversion complete source compression algorithm.

如图4所示,TS节目转换成CMMB节目的转换方法包括如下步骤: Shown, TS 4 converts the program into a CMMB program conversion method comprising the steps of:

1、读取PAT和PMT,获取对应节目的TS包,并在緩冲区中排序,从TS包中取出PES包。 1, reads the PAT and the PMT, the program corresponding to the acquired TS packet, and sorted in the buffer, removed from the TS packets PES packets.

步骤S401:由于一路TS可能包含多路节目,先读取节目相关表(PAT, Program Association Table )及节目对应表(PMT, Program Map Tables ), 分离出其中特定的一路节目,获取对应节目的TS包。 Step S401: Since the way TS may contain multiple programs, first reads the program association table (PAT, Program Association Table) and a program map table (PMT, Program Map Tables), wherein the separated program specific way, to obtain the corresponding program TS package. 依据TS中的分组标识(PID),把TS流中的视频PES包或者音频PES包分别提取出来,并在緩冲区中排序。 Based on packet identification (the PID) of the TS, the TS stream is a video or audio PES packets PES packets are extracted and sorted in the buffer.

步骤S402:判断是否得到一个完整的PES包。 Step S402: determining whether a complete PES packets obtained.

根据TS包头的指示,判断多个TS是否可以组成一个完整的PES,如果是,执行步骤403,否则执行步骤401。 The TS header indication, a plurality of TS is determined whether the PES to form a complete, if so, step 403 is performed, otherwise, step 401 is executed.

2、 当TS组成一个完整的PES时,从MPEG传输流包中取出PES包, 把PES扩展包头中的PTS或DTS取出,转换成复用帧中的时间戳。 2, when the composition of a complete TS PES, taken from the MPEG transport stream packets PES packet, the PES extension header PTS or DTS is extracted, converted into a multiplex frame timestamp.

步骤S403:从一组MPEG传输流包中取出一个PES包,把PES扩展包头中的展现时间戳(PTS)或解码时间戳(DTS)取出,转换成复用帧中的时间戳。 Step S403: the group is removed from a MPEG transport stream packet in a PES packet, the PES extension header of a presentation time stamp (PTS) or a decoding time stamp (DTS) extracted, converted into a multiplex frame timestamp. 该时间戳用于设定视频数据或者音频数据的显示时间,实现视频或者音频播放的同步。 The timestamp is used to set the display time of the video data or audio data, synchronized playback of video or audio.

3、 取出PES中的ES包,按照CMMB复用协议的要求,将视频ES包填入视频单元,或者将音频ES包填入音频单元,在设定时间内形成一个复用帧。 3, taken in the ES PES packet according to claim CMMB multiplex protocol, the packet is filled video unit video ES, audio ES or an audio pack filled unit, to form a multiplexed within a set time frame.

步骤S404:取出PES中的ES包,如果ES包是视频数据,视频ES包填入视频单元;如果ES包是音频数据,则将音频ES包填入音频单元。 Step S404: ES removed the PES packet, if the ES packet is video data, the video unit is filled video ES packet; if the packet is audio data ES, audio ES package will fill the audio unit.

步骤S405:根据复用帧中的时间戳,判断一段设定时间的数据封装是否结束。 Step S405: The multiplex frame timestamp, determines a set time of the data package is finished.

该设定时间可以按照实际需要进行设定,设定时间可以设定为0.25秒、 0.5秒或者1秒。 The time may be set according to actual needs, the set time can be set to 0.25 seconds, 0.5 seconds or 1 second. 本优选实施例中,该设定时间为1秒,如果1秒钟数据封装结束,执行步骤S406,否则,执行步骤401。 In the preferred embodiment, the set time of 1 second, 1 second if the data package ends, perform step S406, otherwise, step 401 is executed.

4、 封装复用帧并发送。 4, the package multiplexing frame and transmitted.

步骤S406:当前的复用帧封装完成,将该复用帧发送给其他设备或做进一步处理,然后,回到步骤S401,获取下一个TS包。 Step S406: The current multiplexing frame package is completed, the multiplex frame transmitted to another device or for further processing, then returned to step S401, the next TS packet acquired.

通过上述方法,可以^l巴目前最常用的TS协议转换成CMMB复用协i义, By the above process, ^ l bar the most common protocol is converted into TS CMMB multiplex Association i Yi,

使得现有广播电视网络中的设备可以继续使用,避免了重复投资。 It allows existing radio and television network equipment may continue to be used, to avoid duplication of investment. 下面列举一个实例,对本发明做进一步描述。 Here are one example of the present invention will be further described.

在本实施例中, 一个业务通道有31.5K字节的视频与音频流,视频数据速率是27.5K字节每秒钟,音频数据速率是4K字节每秒钟。 In the present embodiment, a traffic channel has 31.5K bytes of video and audio streaming, video data rate is 27.5K bytes per second, the data rate of audio is 4K bytes per second.

TS的H.264编码器输出31.5K字节的视频与音频流,分成了很多个188 字节的TS包,经过转码后,每l秒钟形成一个复用帧, 一个复用帧的长度为32K字节。 The H.264 encoder output TS 31.5K bytes of video and audio streams, divided into a number of 188-byte TS packet, after transcoding, each length l is formed a second multiplexing frame, a multiplexing frame of 32K bytes. 其中,包头长37字节,视频数据段总长度是27.5K字节,音频数据段总长度是4K字节,对于不足32K字节的部分,可以填充全0。 Wherein the header 37 bytes long, the total length of the video segment is 27.5K bytes, the total length of the audio data segment is 4K bytes, for a portion less than 32K bytes, may be filled with all zeros.

这样一个电视频道,能够以QVGA分辨率、25帧的H264或AVS的视频数据传输,给用户提供质量相当满意的移动广播电视节目。 Such a television channel, it is possible to QVGA resolution, H264 or AVS video data transmission frame 25, to provide relatively satisfactory quality of mobile broadcast TV programming.

Claims (7)

1、一种传输流节目转换成中国移动多媒体广播节目的方法,包括如下步骤: (1)读取节目相关表和节目对应表,获取对应节目的传输流包,并在缓冲区中排序,从传输流包中取出打包基本码流包; (2)当传输流组成一个完整的打包基本码流时,从运动图像专家组传输流包中取出打包基本码流包,把打包基本码流扩展包头中的展现时间戳或解码时间戳取出,转换成复用帧中的时间戳; (3)取出打包基本码流中的基本流包,按照中国移动多媒体广播复用协议的要求,将视频基本流包填入视频单元,或者将音频基本流包填入音频单元,在设定时间内形成一个复用帧; (4)封装复用帧并发送。 1. A method of converting a transport stream a program China Mobile Multimedia broadcasting program, comprising the steps of: (1) reads the program association table and program map table, obtaining a transport stream packet corresponding to the program, and sorted in the buffer, from remove the transport stream packets packetized elementary stream packet; (2) when the transport stream to form a complete Packetized Elementary stream from the moving picture experts group transport stream packets packetized elementary stream packet removed, the extended header Packetized Elementary stream the decoding time stamp or the presentation time stamp removed, converted into multiplex frame time stamp; (3) removing the packetized elementary stream packets of the elementary stream, as required by China mobile multimedia broadcasting multiplex protocol, the video elementary stream packet fill video unit, an audio or an audio elementary stream packet unit is filled, forming a multiplex frame within a set time; (4) encapsulated multiplexing frame and transmitted.
2、 根据权利要求1所述的传输流节目转换成中国移动多媒体广播节目的方法,其特征在于,步骤(1)中,依据传输流中的分组标识,把传输流中的视频打包基本码流包或者音频打包基本码流包分别提取出来。 2, the transport stream a program according to claim 1 method of converting China Mobile Multimedia Broadcasting program, wherein the step (1), according to the transport stream packet identification, the transport stream of the video packetized elementary stream packet or an audio packetized elementary stream packet are extracted.
3、 根据权利要求1所述的传输流节目转换成中国移动多i某体广播节目的方法,其特征在于,步骤(2)中,所述时间戳用于设定视频数据或者音频数据的显示时间,实现-现频或者音频播放的同步。 3, the conversion program transport stream according to claim 1 to a method of China Mobile Multi i broadcast program body, wherein, in step (2), the setting for displaying the time stamp of audio data or video data time to realize - now or frequency synchronization of audio playback.
4、 根据权利要求1所述的传输流节目转换成中国移动多々某体广播节目的方法,其特征在于,步骤(3)进一步包括:根据复用帧中的时间戳判断设定时间内的数据封装是否结束;如果设定时间内的数据封装结束,执行步骤(4),否则,执行步骤(1)。 4, the conversion program transport stream according to claim 1 in a multi 々 body China Mobile broadcast program, wherein the step (3) further comprising: determining a data set according to the time stamp of the multiplexed frame whether the package end; if the data encapsulated within the end of the time setting, performed in step (4), otherwise, perform step (1).
5、 根据权利要求1所述的传输流节目转换成中国移动多媒体广播节目的方法,其特征在于,步骤(3)中,所述设定时间为0.25秒、0.5秒或者1秒。 5, the transport stream a program according to claim 1 method of converting China Mobile Multimedia Broadcasting program, wherein, in step (3), the setting time is 0.25 seconds, 0.5 seconds or 1 second.
6、 根据权利要求1所述的传输流节目转换成中国移动多媒体广播节目的方法,其特征在于,步骤(4)中,所述复用帧的长度为32K字节。 6, the transport stream a program according to claim 1 method of converting China Mobile Multimedia Broadcasting program, wherein, in step (4), the multiplex frame length of 32K bytes.
7、 根据权利要求1所述的传输流节目转换成中国移动多媒体广播节目的方法,其特征在于,步骤(4)进一步包括:当复用帧封装完成后,执行步骤(1 )。 7, the transport stream a program according to claim 1, said method of converting China Mobile Multimedia Broadcasting program, wherein, in step (4) further comprising: a multiplexing frame when the packaging is finished, step (1).
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