WO2008022501A1 - A realizing method of multi-video streams broadcast in mobile multimedia - Google Patents

A realizing method of multi-video streams broadcast in mobile multimedia Download PDF

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Publication number
WO2008022501A1
WO2008022501A1 PCT/CN2006/003759 CN2006003759W WO2008022501A1 WO 2008022501 A1 WO2008022501 A1 WO 2008022501A1 CN 2006003759 W CN2006003759 W CN 2006003759W WO 2008022501 A1 WO2008022501 A1 WO 2008022501A1
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Prior art keywords
video
data
channel
header
transmitted
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English (en)
French (fr)
Inventor
Can Shen
Zhiying Wang
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ZTE Corp
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ZTE Corp
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/24—Systems for the transmission of television signals using pulse code modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2365—Multiplexing of several video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4347—Demultiplexing of several video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6131—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network

Definitions

  • the present invention relates to the field of mobile multimedia broadcast or mobile TV technology, and in particular, to a method for implementing multiple video streams of a mobile multimedia broadcast channel.
  • Mobile multimedia broadcasting is a multimedia playback technology that has emerged in recent years. With a handheld terminal, you can watch TV at high speeds. The terminal receives the program list through the wireless protocol, and can select the channel that has the right to watch, so that the multimedia data of the selected channel can be accepted, and the television is watched on the mobile terminal.
  • the air data transmitted by the broadcasting system is divided into different channels and transmitted separately by multiplexing technology. The terminal can receive relevant data and realize normal playing of the television through the player on the terminal.
  • the system can send 1 channel of video or send multiple channels of video signals.
  • the TS protocol is one of the MPEG (Moving Picture Experts Group) standards. It transmits video, audio and control information in a fixed 188-byte packet, and distinguishes different videos by PID (program number) field. Streaming, which can support the playback of multiple video streams. However, each packet of the TS method is small and inefficient.
  • the second is the ISMA (Internet Streaming Media Alliance) approach.
  • the ISMA specification uses RTP (Real-Time Transport Protocol) to transport media information.
  • a method is provided that can implement multiple video streams in a mobile multimedia broadcast system such that multiple video streams can be transmitted in a mobile multimedia broadcast system and improve the efficiency of transmission of video streams in a mobile multimedia broadcast system.
  • the technical solution of the present invention is as follows:
  • a method for implementing a mobile multimedia broadcast multiple video stream includes the following steps:
  • each video unit having a number of a respective video stream; (2) selecting, if several thousand divided video units, from a plurality of video streams, Composing a video data, and recording the length, video stream number, and time information of each video unit in the video header of the video data;
  • the video data and other data to be transmitted are encapsulated and transmitted in one channel.
  • synchronization header isolation can be used between each video unit in one video data.
  • the video packet header of the step (2) further records frame type information of each video unit.
  • the other data to be transmitted in the above step (3) includes: packet header data, video data, audio data, and synchronization data of each channel.
  • the foregoing step (3) further includes the following steps: (31) dividing the multimedia broadcast into multiple channels in a time division multiplexing manner, where there is one control channel and at least one data channel;
  • (32) respectively assigning one or more data channels to each channel of the multimedia broadcast for transmitting real-time multimedia data of each channel;
  • the control information and the program list information are encapsulated in the control channel transmission, and the packet header data, the video data, the audio data, and the synchronization data of each channel are encapsulated in a data channel corresponding to the channel.
  • the invention divides into multiple video units by 4 bar each video stream, and 4 bar multiple video streams are installed in one channel, and multiple video units are used to transmit multiple video streams, so that the same video data can be realized. Transmitting multiple video streams.
  • the present invention is a method for implementing one channel multiplex video suitable for use in a broadcast network, and is particularly suitable for use in a mobile broadcast network.
  • the form of the multimedia service data transmitted in one channel may be various.
  • the embodiment of the present invention provides a form in which multimedia service data transmitted in one channel may be used by the packet header.
  • the packet header mainly includes control information, and specifically includes: length information, program information, video parameters, audio parameters, synchronization data parameters, time stamps, data security parameters, and packet header check codes.
  • the header check code can also verify the reliability of the header information, which is a field used to implement data encryption.
  • the main problem to be solved by the present invention is how to package multiple video streams in one channel. Taking the composition form of the service data in one channel shown in FIG. 1 as an example, that is, how to make the video data therein carry multiple video streams. Therefore, according to an embodiment of the present invention, each video stream that needs to be transmitted may be separately divided into a plurality of video units, each video unit having a number of a respective video stream, and each video unit is isolated by a synchronization header. To achieve the function of error isolation.
  • a plurality of divided video units are respectively selected from the plurality of video streams to form a video data, and the length, video stream number, and timestamp information of each video unit are recorded in a video header of the video data.
  • the length of the video unit can be used to locate and divide each video unit data, the time stamp refers to the playing time, and the video stream number is used to identify which video stream the video unit belongs to. Due to the scalability of the video header information, the length of the video unit included in the above video data is variable.
  • the frame type information of each frequency unit can also be recorded in the video header, and the frame type of the video unit is used to mark Know that this video unit is a keyframe, non-keyframe.
  • Step 1 Divide the multimedia broadcast into multiple channels in a time division multiplexing manner, wherein there is one control channel and at least one control channel.
  • a data channel; a radio broadcast can transmit one full frame structure data in a fixed time interval, the fixed time interval can be 1 second, or other time values, and the full frame is composed of all channels of the above divided channels.
  • Step 2 Each channel of the multimedia broadcast is respectively assigned one or more data channels for transmitting real-time multimedia data of each channel;
  • Step 3 encapsulating the control information and the program list information in the control channel for transmission, each will The header data, video data, audio data, and synchronization data of the channels are encapsulated in the data channel corresponding to the channel.
  • the implementation details of the present invention are specifically described below by taking two video streams as an example. As shown in FIG. 2, it is assumed that two video streams are transmitted in one channel, and it is assumed that the first video stream is divided into 15 video units, and the second video stream is divided into 10 video units, at a certain After sequentially selecting and combining into one video data, the video data includes the two video streams.
  • the first video stream includes: video units 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 22, 23, 24, 25,
  • the second video stream includes: video units 2, 4, 6, 8, 10, 12, 14, 16, 18, 20.
  • the video data and the header data, the audio data, and the synchronization data can be encapsulated and transmitted in one channel.
  • the specific implementation of the two video streams shown in FIG. 2 is to cross-select the video units of the two video streams, the present invention is not limited to any order. Since the description information of each video unit in the ⁇ frequency packet header, including the video stream number of the video unit, can clearly identify which video stream each video unit belongs to, the video units of the two video streams may not completely follow the picture.
  • the order of the order in 2 that is, the order in Fig.
  • 4 non-column order may have no rules.
  • the above is the implementation process of transmitting two video streams in one channel. According to the same principle, it can be realized. One video stream, two video streams, or more than two video streams are simultaneously transmitted in one channel. In an experiment conducted in accordance with an embodiment of the present invention, it is assumed that each data channel has a rate of 128 Kbit/s, and one channel includes two data channels, which may have a rate of 256 Kbit/s.
  • the channel includes: the header is 122 bytes long, the video header is 127 bytes long, and the video data is 26.5K bytes long.
  • the bandwidth of the first video stream is 20. 5K bytes, and the bandwidth of the second video stream is 6K words.
  • Section, the audio header is 129 bytes long, the audio data is 4K bytes long, and the synchronous data is 1K bytes long. For parts less than 32K bytes, all 0s can be filled.
  • Such a TV channel can satisfy the transmission of 1 QVGA resolution, 25 frames of H264 or AVS-M video data, and the transmission of a QCIF, 12 frames of H264 or AVS-M video data, which can provide users with considerable Satisfied quality of dual video streaming mobile radio and television shows.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

一种移动多 某体广播多枧频流的实现方法 技术领域 本发明属于移动多媒体广播或手机电视技术领域，特别涉及到一种实现移 动多媒体广播频道的多视频流的方法。 背景技术 移动多媒体广播是近年来兴起的一种多媒体播放技术。 通过手持的终端， 在高速移动的情况下， 可以观看电视。 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。 广播系统发射的空中数据，被分成不同的频道，通过复用技术来分别传输， 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。 对于同一个频道， 系统可以发送 1路视频， 也可以发送多路视频信号。 现有的实现多路视频的方法主要有 2种： 第一种是 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 ί巴视频、音频及控制信息放在一个固定 188字节大小的包里传送， 通过 PID (节目编号） 字段来区分不同的视频流， 从而可以支持多视频流的播 放。 但 TS方式的每个包 4艮小， 效率比较低。 第二种是 ISMA (互联网流媒体联盟） 方式。 ISMA规范是用 RTP (实时 传输协议）传送媒体信息， 可以打开多个 RTP通道， 传送不同的视频流， 但这 种方式只适合在 IP网絡上使用。 发明内容 提供一种可在移动多 媒体广播系统中实现多视频流的方法， 使得多个视频流可以在移动多媒体广播 系统中传送， 并提高移动多媒体广播系统中视频流的传送效率。 本发明的技术方案如下:
一种移动多媒体广播多视频流的实现方法， 包括如下步骤:
( 1 ) 将需要传输的每个视频流分割成多个视频单元， 每个视频单元都具 有各自视频流的编号； ( 2 ) 从若干个视频流中分别选取若千个分割后的视频单元， 组成一个视 频数据， 并将其中每个视频单元的长度、 视频流编号、 时间 信息记录在该视 频数据的视频包头中；
( 3 ) 将该视频数据与其他需要传输的数据封装在一个频道中传送。 上述步骤 （2 ) 中， 在一个视频数据中的每个视频单元之间可使用同步头 文隔离。 进一步， 步骤 （2 ) 所述的视频包头中还记录各视频单元的帧类型信息。 上述步骤 （3 ) 所述其他需要传输的数据包括： 每个频道的包头数据、 视 频数据、 音频数据、 同步数据。 进一步， 上述步骤 （3 ) 还包括以下步骤： ( 31 )以时分复用方式将多媒体广播划分为多个通道， 其中具有一个控制 通道与至少一个数据通道；
( 32 )为多媒体广播的每个频道分别分配一个或多个数据通道， 用于传输 各个频道的实时多媒体数据；
( 33 )将控制信息以及节目列表信息封装于所述控制通道传输， 将每个频 道的包头数据、 视频数据、 音频数据、 同步数据封装于对应该频道的数据通道 传输。 本发明通过 4巴每个视频流分割成多个视频单元， 4巴多个视频流^"装在一个 频道中， 用多个视频单元来传送多个视频流， 实现了同一个视频数据中可以传 送多个视频流。 本发明属于一种适合在广播网络中使用的实现 1个频道多路视 频的方法， 尤其适合在移动广播网络中使用。 附图说明 图 1是一个频道的视频数据中视频流被分割成多个视频单元的示意图。 图 2是视频数据中含有 2个分割成多个视频单元的视频流的示意图。 具体实施方式 下面结合附图对本发明 ：详细描述。 在 1个频道内传输的多媒体业务数据的组成形式可以是多样的， 例如， 如 图 1所示， 本发明实施例提供了一种形式， 其中在 1个频道内传输的多媒体业 务数据可以由包头、 视频数据、 语音数据、 同步数据所組成。 其中， 包头主要为控制信息， 具体包括： 长度信息、 节目信息、视频参数、 音频参数、 同步数据参数、 时间戳、 数据安全参数、 包头校验码等。 包头校验 码还可以验证包头信息的可靠性， 所述数据安全参数是用来实现数据加密的字 段。 本发明所要解决的主要问题就是如何将多个视频流封装在一个频道内。以 图 1所示的 1个频道内的业务数据的組成形式为例， 也就是说如何使其中的视 频数据承载多个视频流。 因此，根据本发明的实施例， 首先可以将需要传输的各视频流分别分割成 多个视频单元， 每个视频单元都具有各自视频流的编号， 每个视频单元之间用 同步头做隔离， 以达到错误隔离的功能。 从上述若干个视频流中分别选取若干个分割后的视频单元，组成一个视频 数据， 并将其中每个视频单元的长度、 视频流编号、 时间戳信息记录在该视频 数据的视频包头中。 其中，视频单元的长度可以用来定位分割每一个视频单元数据， 时间戳是 指播放的时间， 视频流编号是用来标识这个视频单元属于哪一个视频流。 由于视频包头信息的可扩展性，因此上述视频数据包括的视频单元的长度 是可变的。 视频包头中还可记录各枧频单元的帧类型信息，视频单元的帧类型用来标 识这个视频单元是关键帧、 非关键帧。 通过上述方法，就实现了在一个频道内包含了多个视频流， 这样就可以以 无线多媒体广播信号的形式， 通过空中传送了。 具体的传送方法有很多， 还以 图 1所示的数据组成形式为例， 说明一种传送方法： 步骤 1 : 以时分复用方式将多媒体广播划分为多个通道， 其中具有一个控 制通道与至少一个数据通道； 无线广播可以在一个固定时间间隔内发送 1个全 帧结构数据， 固定时间间隔可以是 1秒钟， 也可以是其他时间值， 全帧由上述 划分的多个通道的全部通道组成； 步骤 2: 为多媒体广播的每个频道分别分配一个或多个数据通道， 用于传 输各个频道的实时多媒体数据； 步骤 3: 将控制信息以及节目列表信息封装于所述控制通道传输， 将每个 频道的包头数据、 视频数据、 音频数据、 同步数据封装于对应该频道的数据通 道传输。 下面以 2个视频流为例， 来具体说明本发明的实现细节。 如图 2所示， 假 设有 2个视频流在一个频道内传输， 并假设第一个视频流被分割为 15个视频 单元， 第 2个视频流被分割为 10个视频单元， 在以一定的顺序选取并組合成 一个视频数据后， 该视频数据包括了这两个视频流， 具体来说， 第 1个视频流 包括： 视频单元 1、 3、 5、 7、 9、 11、 13、 15、 17、 19、 21、 22、 23、 24、 25 , 第 2个视频流包括： 视频单元 2、 4、 6、 8、 10、 12、 14、 16、 18、 20。 这样， 就可以将该视频数据与包头数据、音频数据、 同步数据封装在一个频道中传送。 尽管图 2给出的这 2个视频流的具体实现方法， 是将两个视频流的视频单元中 交叉选取， 但实际上本发明并不限于任何顺序。 由于枧频包头中有对每个视频单元的描述信息，包括视频单元的视频流编 号， 能清楚地标识每视频单元属于哪一个视频流， 因此这 2个视频流的视频单 元可以不完全按照图 2中的次序排列， 即图 2中的次序是可以调整的， 如， 还 可以 4非列成 1、 3、 2、 4、 5、 7、 6、 8、 9、 11、 10、 12、 13、 15、 14、 16、 17、 19、 18、 20、 21、 22、 23、 24、 25 , 或 4非列成其它顺序， 4非列次序可以没有一 定的规则。 以上是一个频道内传输两个视频流的实现过程，按照同样原则， 可以实现 1个视频流、 2个视频流或 2个以上的视频流同时在一个频道内传送。 在根据本发明的实施例进行的实验中， 设每个数据通道有 128Kbit/s的速 率， 1个频道包括了 2个数据通道， 可以有 256Kbit/s的速率。 这个频道包括： 包头长 122字节，视频包头长 127字节，视频数据长 26.5K 字节， 其中第一视频流的带宽是 20. 5K字节， 第 2个视频流流的带宽是 6K字 节， 音频包头长 129字节， 音频数据长 4K字节， 同步数据长 1K字节， 对于 不足 32K字节的部分， 可以填充全 0。 这样一个电视频道，可以满足 1个 QVGA分辨率、 25帧的 H264或 AVS-M 的视频数据的传输，和一个 QCIF、 12帧的 H264或 AVS-M的视频数据的传输， 可以给用户提供相当满意的质量的双视频流的移动广播电视节目。

Claims

权 利 要 求 书
1、 一种移动多媒体广播多视频流的实现方法， 特征在于， 包括如下步骤：
( 1 ) 将需要传输的每个视频流分割成多个视频单元， 每个视频单 元都具有各自视频流的编号；
( 2 ) 从若干个视频流中分别选取若干个分割后的视频单元， 组成 一个视频数据， 并将其中每个视频单元的长度、 视频流编号、 时间 信 息记录在该视频数据的视频包头中；
( 3 )将该视频数据与其他需要传输的数据封装在一个频道中传送。
2、 如权利要求 1所述的方法， 其特征在于， 所述步骤（2 )进一步包括： 在 一个视频数据中的每个视频单元之间， 使用同步头做隔离。
3、 如权利要求 1所述的方法， 其特征在于， 步骤（2 )所述的视频包头中进 一步记录各视频单元的帧类型信息。
4、 如权利要求 1所述的方法， 其特征在于， 步骤（3 )所述其他需要传输的 数据包括： 每个频道的包头数据、 视频数据、 音频数据、 同步数据。 5、 如权利要求 4所述的方法， 其特征在于， 所述步骤 （3 ) 包括：
( 3 1 )以时分复用方式将多媒体广播划分为多个通道， 其中具有一 个控制通道与至少一个数据通道；
( 32 ) 为多媒体广播的每个频道分別分配一个或多个数据通道， 用于传 输各个频道的实时多媒体数据；
( 33 )将控制信息以及节目列表信息封装于所述控制通道传输， 将每个 频道的包头数据、 视频数据、 音频数据、 同步数据封装于对应该频道的数据通 道传输。
6、 如权利要求 5所述的方法， 其特征在于， 移动多媒体广播系统以一个固定时间 间隔发送 1个全帧结构数据，所述全帧由所述划分的多个通道的全部通道组成。 7、 如权利要求 1所述的方法， 其特征在于， 所述视频数据包括的视频单元 的长度是可变的， 该信息记录在所述视频包头中。
PCT/CN2006/003759 2006-08-16 2006-12-30 A realizing method of multi-video streams broadcast in mobile multimedia Ceased WO2008022501A1 (en)

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