WO2011003302A1 - 移动多媒体广播系统中分级传送、接收方法与装置 - Google Patents

移动多媒体广播系统中分级传送、接收方法与装置 Download PDF

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Publication number
WO2011003302A1
WO2011003302A1 PCT/CN2010/072958 CN2010072958W WO2011003302A1 WO 2011003302 A1 WO2011003302 A1 WO 2011003302A1 CN 2010072958 W CN2010072958 W CN 2010072958W WO 2011003302 A1 WO2011003302 A1 WO 2011003302A1
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Prior art keywords
code stream
layer code
stream
video
base layer
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PCT/CN2010/072958
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English (en)
French (fr)
Inventor
阮亚平
张建强
童登金
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US13/381,908 priority Critical patent/US20120198501A1/en
Priority to JP2012518738A priority patent/JP5543590B2/ja
Publication of WO2011003302A1 publication Critical patent/WO2011003302A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/42—Arrangements for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/30—Arrangements for simultaneous broadcast of plural pieces of information by a single channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/57—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for mobile receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/76—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet
    • H04H60/81—Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself
    • H04H60/90—Wireless transmission systems
    • H04H60/91—Mobile communication networks

Definitions

  • the present invention relates to a transmission technology in a mobile multimedia broadcast system, and more particularly to a method and apparatus for hierarchical transmission and reception of a video stream in a China Mobile Multimedia Broadcasting System (CMMB).
  • CMMB China Mobile Multimedia Broadcasting System
  • DVB-H draws hierarchical modulation to build network technology, allowing two independent multiplexing layers in the system to share the same channel. It has been proposed to use hierarchical modulation to transmit the same video content at two different code rates in order to facilitate adaptive selection of terminals with different capabilities and reception environments, thereby maximizing the quality of experience of the user.
  • the drawback of this method is that there is some redundancy in the two multiplexed contents, and the channel bandwidth is wasted.
  • the two layers of the same video content are transmitted by the hierarchical coding method for the hierarchical modulation, and the basic layer code stream can be separately decoded, and the enhancement layer code stream is included to improve the base layer code stream. Additional information on quality.
  • the video grading encoder can encode the video content source to produce an L+1 layer code stream.
  • the method includes a basic layer code stream that can be independently decoded, and an L channel enhancement layer code stream, and the enhancement layer code stream includes additional information for improving the quality of the base layer code stream, and needs to be decoded together with the base layer to improve video quality. .
  • the code streams of all layers converge to provide the highest video quality.
  • the main video hierarchical coding method is scalable video coding (SVC, Scalable Video Coding).
  • SVC Scalable Video Coding
  • the CMMB standard specifies the frame structure, channel coding and modulation mode of the broadcast channel transmission signal of the mobile multimedia broadcasting system within the frequency range of the broadcasting service.
  • the CMMB standard "Mobile Multimedia Broadcasting Part 2: Multiplexing" specifies that multiplexed sub-frames are used to encapsulate streaming media data such as video and audio.
  • 1 is a schematic structural diagram of a CMMB channel frame. As shown in FIG. 1, a CMMB channel frame is divided into 40 time slots, each time slot is 25 ms, and one multiplex frame can occupy one or more time slots arbitrarily.
  • the multiplex frame is identified by the multiplex frame identifier MF_ID.
  • MF_ID When MF_ID is equal to 0, it represents the control channel multiplex frame, and if it is not equal to 0, it is a normal multiplex frame.
  • the time slot 0 transmits the control information of the multiplex frame, that is, the control information multiplex frame, and the control information multiplex frame is composed of the frame header and the control information table.
  • a multiplex frame consists of a multiplexed frame header, a multiplexed frame payload, and a padding, and various service data are carried in the multiplexed payload.
  • the multiplexed frame payload is further divided into a plurality of multiplexed subframes, and each multiplexed subframe is used to transmit one service.
  • Each multiplex subframe consists of a multiplex subframe header and a payload, and the payload is composed of segments.
  • the segments are divided into audio segments, video segments, and data segments, and respectively carry video data, audio
  • the main object of the present invention is to provide a method and apparatus for hierarchical transmission and reception in a mobile multimedia broadcast system, which can hierarchically transmit video services in a CMMB system, thereby satisfying multi-level service requirements of user terminals.
  • a hierarchical transmission method in a mobile multimedia broadcast system comprising:
  • the video stream in the video service is sequentially divided into a base layer code stream and at least one enhancement layer code stream, and the base layer code stream and the at least one enhancement layer code stream are respectively encapsulated in a broadcast channel frame according to a layer to which they belong.
  • the location information of the multiplex subframe in which the code streams of the video streams are located is encapsulated in the broadcast channel frame and sent to the receiving end.
  • the interval between the multiplex subframes in which the layer streams are located is a duration for setting a threshold.
  • the multiplexing frame to which the multiplex subframe in which the layer code streams are located belongs to different multiplex frames.
  • the frame numbers of the multiplex subframes in which the layer streams are located are the same.
  • the audio stream and the data stream in the video service are carried in a multiplex subframe in which the base layer code stream is located.
  • a hierarchical receiving method in a mobile multimedia broadcasting system comprising:
  • the location information of the multiplex subframe in which the layer streams of the video stream in the video service in the broadcast channel frame are located is received, and the receiving terminal receives the base layer code stream according to the video stream processing capability of the broadcast channel, or receives the base layer code stream and the corresponding enhancement.
  • the layer code stream decodes the base layer code stream, or the base layer code stream and the corresponding enhancement layer code stream, and outputs the video data of the base layer code stream or the video data of the base layer code stream and the enhancement layer code stream.
  • the method further includes:
  • a hierarchical transmission device in a mobile multimedia broadcast system comprising:
  • a layering unit configured to sequentially divide the video stream in the video service into a base layer code stream and at least one enhancement layer code stream;
  • a first encapsulating unit configured to encapsulate the base layer code stream and the at least one enhancement layer code stream into different multiplex subframes in a broadcast channel frame according to layers to which they belong;
  • a location information generating unit configured to generate location information of a multiplex subframe in which each layer of the video stream is located
  • a second encapsulating unit configured to encapsulate location information of a multiplex subframe in which each layer of the video stream is located in the broadcast channel frame
  • a sending unit configured to send the broadcast channel frame to the receiving end.
  • the interval between the multiplex subframes in which the code streams of the video streams are located is a duration for setting a threshold.
  • the multiplexing frame to which the multiplex subframe in which each layer of the video stream belongs is different.
  • the frame numbers of the multiplex subframes in which the layer streams of the video stream are located are the same.
  • a hierarchical receiving device in a mobile multimedia broadcasting system comprising:
  • a monitoring unit configured to monitor location information of a multiplex subframe in which each layer of the video stream in the video service in the broadcast channel frame is located;
  • a receiving unit configured to receive a basic layer code stream according to a video stream processing capability of the receiving terminal to which the receiving unit belongs, or receive the base layer code stream and a corresponding enhancement layer code stream;
  • a decoding unit configured to decode the base layer code stream, or the base layer code stream and a corresponding enhanced layer code stream
  • an output unit configured to output video data of the base layer code stream, or video data of the base layer code stream and the enhancement layer code stream.
  • the video stream in the video service is hierarchically encoded, and each hierarchical video stream is separately encapsulated into different multiplex subframes of the CMMB broadcast channel frame, and when the video stream data is transmitted, each hierarchical video stream is broadcasted in the CMMB.
  • the location information in the multiplex subframe carried by the channel frame is sent to the receiving end, and the receiving end monitors the location information of the multiplexed subframe carrying the hierarchical video stream in the CMMB broadcast channel frame, and the video supported by the receiving terminal.
  • Stream decoding capability determining to receive only the base layer code stream or the receiving base layer code stream and its corresponding enhancement layer code stream, and decoding the received base layer code stream or the base layer code stream and its corresponding enhancement layer code stream, Output to the user.
  • the present invention does not require an independent channel for transmitting hierarchical video stream data, and the video stream data of each level can share the same channel layer and modulation layer, so that the CMMB system can be automatically backward compatible with receiving terminals that do not support hierarchical decoding, and the receiving terminal can select according to its own conditions.
  • FIG. 1 is a schematic structural diagram of a CMMB channel frame
  • FIG. 2 is a flowchart of a hierarchical transmission method in a mobile multimedia broadcast system according to the present invention
  • 3 is a schematic structural diagram of a structure of a broadcast channel frame according to the present invention
  • FIG. 4 is a flowchart of a hierarchical receiving method in a mobile multimedia broadcasting system according to the present invention
  • FIG. 5 is a schematic structural diagram of a hierarchical transmitting device in a mobile multimedia broadcasting system according to the present invention
  • FIG. 6 is a composition of a hierarchical receiving device in a mobile multimedia broadcasting system according to the present invention. Schematic. detailed description
  • the basic idea of the present invention is: hierarchically encoding a video stream in a video service, and respectively packing each hierarchical video stream into different multiplex subframes of a CMMB broadcast channel frame, and when arranging the video stream data, each hierarchical video stream
  • the location information in the multiplexed subframe of the CMMB broadcast channel frame is sent to the receiving end, and the receiving end monitors the location information of the multiplexed subframe that carries the hierarchical video stream in the CMMB broadcast channel frame, and the receiving terminal Supported video stream decoding capability, determining to receive only the base layer code stream or the receiving base layer code stream and its corresponding enhancement layer code stream, and receiving the received base layer code stream or base layer code stream and its corresponding enhancement layer code stream Decode and output to the user.
  • the present invention does not require an independent channel for transmitting hierarchical video stream data, and the video stream data of each level can share the same channel layer and modulation layer, so that the CMMB system can be automatically backward compatible with receiving terminals that do not support hierarchical decoding, and the receiving terminal can select according to its own conditions.
  • Receive base layer data or base layer data and its corresponding enhancement layer data The solution of the invention is simple and practical.
  • FIG. 2 is a flowchart of a hierarchical transmission method in a mobile multimedia broadcast system according to the present invention. As shown in FIG. 2, the hierarchical transmission method in the mobile multimedia broadcast system of the present invention includes the following steps:
  • Step 201 The video stream in the video service is sequentially divided into a base layer code stream and at least one enhancement layer code stream, and the base layer code stream and the at least one enhancement layer code stream are respectively encapsulated in a broadcast channel according to a layer to which they belong.
  • the location information of the multiplex subframe in which the layer stream of each layer of the video stream is located is encapsulated in the broadcast channel frame.
  • the video stream in the video service is encoded by the foregoing SVC method, and the code is generated to generate one.
  • a base layer code stream and one or more enhancement layer code streams wherein the base layer code stream includes a basic video data stream, and audio and other basic data information in the video service; the basic layer code stream is directed to an ordinary receiving terminal
  • the receiving terminal can obtain the basic video service by decoding the base layer code stream, but the picture quality of the obtained basic video service is general.
  • the enhancement layer code stream is an optimization of the video picture in the video service, which needs to be optimized on the basis of the base layer code stream decoding data, and the receiving terminal supporting the advanced video processing, in addition to receiving the base layer code stream In addition to the data, the corresponding enhancement layer code stream is simultaneously received, and the base layer code stream and its corresponding enhancement layer code stream are respectively decoded, and a very good video picture is obtained, thereby reflecting the quality of the video service.
  • the CMMB system uses each layer of code stream data as a different service, and the base layer code stream and the enhancement layer code stream are carried in different layers of the broadcast channel frame according to the layer to which they belong. Use in a sub-frame.
  • the multiplexed subframes of the code streams of the layers are located in different multiplexed frames.
  • the code stream of each layer is preferably located in each multiplex frame.
  • the layers of the video stream are not particularly large, generally two to three layers, that is, the enhancement layer code stream corresponding to one base layer stream is generally one to two, therefore, the hierarchical video The stream does not occupy a large amount of resources of the CMMB channel broadcast frame.
  • the video service S be a television service including one channel of video data plus one channel of audio.
  • the video code of the video service S is captured by the SVC, and then encoded to generate a base layer video code stream and an enhancement layer video code stream.
  • 3 is a schematic structural diagram of a broadcast channel frame according to the present invention. As shown in FIG. 3, there are 40 time slots on a certain frequency point F, wherein time slot 0 (ie, multiplex frame 0) is used to transmit control information, and time slot 1 The time slot 39 is used to transmit service information.
  • the multiplexer configures the video base layer code stream, audio, and other basic data information of the video service S in the multiplex frame 1, occupying slot 1 to slot 4, and multiplexing the subframe number to 1.
  • the video enhancement layer code stream of the video service S is configured to multiplex frame 2, occupying slot 5 to Slot 6, the multiplex subframe number is 1. No other services are transmitted in the multiplex frame 1 and the multiplex frame 2.
  • Descriptive information of a multiplex frame position carrying a code stream of each layer is added to the service control information and the electronic service guide (ESG, Electronic Service Guide) information, and the description is The information indicates that the video service S includes two multiplexed subframes: the multiplex subframe 1 of the multiplex frame 1 is the service base layer code stream data, and the multiplex subframe 1 of the multiplex frame 2 is the enhancement layer code stream data.
  • the multiplexer obtains the base layer code stream VI of the video service S, encapsulates it into the multiplex subframe 1 of the multiplex frame 1, acquires the enhancement layer code stream V2 of the video service S, and encapsulates the multiplex frame of the multiplex frame 2 1 in.
  • the multiplexer obtains the audio code stream of the video service S and other basic data segment information, and adds it to the multiplex subframe 1 of the multiplex frame 1, that is, is carried in the same multiplex subframe together with the base layer code stream.
  • the description information of the multiplexed frame position of each layer of the code stream is carried in the multiplex frame 0 in the broadcast channel frame to indicate the multiplexed frame position of the code stream of each layer of the receiving terminal, so as to facilitate the receiving of the video service s.
  • Step 202 Transmit the broadcast channel frame.
  • the multiplexer outputs a multiplex frame carrying each stage of the code stream, and is modulated and transmitted to form a broadcast signal. Still explained by the foregoing example: The multiplexer outputs a complete multiplex frame 1 and a multiplex frame 2, modulated and transmitted to form a broadcast.
  • FIG. 4 is a flowchart of a hierarchical receiving method in a mobile multimedia broadcasting system according to the present invention. As shown in FIG. 4, the hierarchical receiving method in the mobile multimedia broadcasting system of the present invention includes the following steps:
  • Step 401 The receiving terminal monitors location information of a multiplex subframe where each layer of the video stream in the video service in the broadcast channel frame is located, and receives the base layer code stream according to the video stream processing capability of the broadcast channel, or receives the base layer code stream. And the corresponding enhancement layer code stream.
  • the receiving terminal listens to the multiplex frame 0 in the broadcast channel frame, and receives the control information and the ESG information to correctly receive the multimedia broadcast service, and simultaneously monitors the location of the multiplex subframe in which the layer code streams in the hierarchical video service are located.
  • the receiving terminal determines whether to receive only the multiplex subframe in which the base layer code stream is located, or the base layer code stream and its corresponding enhancement layer according to its processing capability.
  • the code stream it should be noted that the enhancement layer code stream received by the receiving terminal is also determined according to the processing capability.
  • the receiving terminal with strong processing capability can process all the enhancement layer code streams transmitted by the system, and the receiving terminal capability is slightly poor. Only the enhancement layer code stream corresponding to the capability of the receiving terminal can be received.
  • the picture quality of the video service that can be obtained by the receiving terminal is different, and the picture of the video service obtained by the receiving terminal with strong processing capability is relatively good, or Can meet the corresponding video business functions, such as support for stereo playback effects.
  • the basic receiving terminal can only receive the code stream of the base layer and output a basic video picture.
  • Step 402 Decode the base layer code stream, or the base layer code stream and the corresponding enhancement layer code stream, and output the video data of the base layer code stream or the video data of the base layer code stream and the enhancement layer code stream.
  • the receiving terminal decodes the received base layer code stream, or the base layer code stream and the corresponding enhancement layer code stream, and outputs a video service corresponding to the base layer code stream, and for the receiving terminal that receives the enhancement layer code stream,
  • the received base layer code stream and its enhancement layer code stream are separately decoded, and the video stream data in the base layer code stream and its enhancement layer code stream are combined, and the output picture quality is better or supports corresponding functions (such as The stereoscopic playback function) of the video service.
  • the hierarchical transmission apparatus in the mobile multimedia broadcast system of the present invention includes a layering unit 50, a first encapsulating unit 51, and a location information generating unit. 52, the second encapsulating unit 53 and the sending unit 54, wherein the layering unit 50 is configured to sequentially divide the video stream in the video service into a base layer code stream and at least one enhancement layer code stream; the layering unit 50 may be encoded by SVC. Implemented.
  • the first encapsulating unit 51 is configured to encapsulate the base layer code stream and the at least one enhancement layer code stream into different multiplex subframes in the broadcast channel frame according to the layer to which they belong;
  • the location information generating unit 52 is configured to generate the The location information of the multiplex subframe in which the code stream of each layer of the video stream is located;
  • the second encapsulating unit 53 is configured to encapsulate the location information of the multiplex subframe where the code stream of each layer of the video stream is located in the broadcast channel frame.
  • the transmitting unit 54 is configured to send the broadcast channel frame to the receiving end.
  • Base layer code stream and enhancement layer code stream according to its The layer to which it belongs is carried in different multiplex subframes in the broadcast channel frame.
  • the multiplexed subframes of the code streams of the layers are located in different multiplexed frames.
  • the code stream of each layer is preferably located in each multiplex frame. In the multiplex subframe with the same number.
  • the hierarchical transfer device in the mobile multimedia broadcast system shown in Fig. 5 is applicable to the CMMB system side.
  • the hierarchical receiving apparatus in the mobile multimedia broadcasting system of the present invention includes a listening unit 60, a receiving unit 61, a decoding unit 62, and an output unit 63.
  • the monitoring unit 60 is configured to monitor the location information of the multiplex subframe in which the layer streams of the video stream in the video service in the broadcast channel frame are located; the receiving unit 61 is configured to use the video stream of the receiving terminal to which the receiving unit 61 belongs.
  • the processing capability receives the base layer code stream, or receives the base layer code stream and the corresponding enhancement layer code stream; the decoding unit 62 is configured to use the base layer code stream, or the base layer code stream, and the corresponding enhancement layer code The stream is decoded; the output unit 63 is configured to output video data of the base layer code stream, or video data of the base layer code stream and the enhancement layer code stream.
  • the hierarchical receiving apparatus in the mobile multimedia broadcasting system shown in FIG. 6 is applied to the receiving terminal side. It should be understood by those skilled in the art that the implementation functions of the processing units in the hierarchical receiving apparatus in the mobile multimedia broadcasting system shown in FIG. 6 can be understood by referring to the related description in FIG. 4 described above.
  • the functions of the units in the hierarchical receiving apparatus in the mobile multimedia broadcasting system shown in FIG. 6 can be realized by a program running on a processor, or can be realized by a specific logic circuit. The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Description

移动多媒体广播系统中分级传送、 接收方法与装置 技术领域
本发明涉及移动多媒体广播系统中传输技术， 尤其涉及一种中国移动 多媒体广播系统（ CMMB , China Mobile Multimedia Broadcasting )中视频 流的分级传送、 接收方法与装置。 背景技术
随着技术发展， 多媒体广播技术特别是移动多媒体广播技术得到了迅 速发展， 目前广泛使用的标准包括： 数字视频广播 -手持（DVB-H, Digital Video Broadcast-Handhold ) , 数字多媒体广播 -地面 （T-DMB , Terrestrial Digital Multimedia Broadcasting )、 CMMB等。
DVB-H中釆取了分级调制来构建网络技术， 允许系统中两个独立的复 用层共享同一信道。 已经有人提出利用分级调制以两个不同码率发送同一 视频内容， 以便于具有不同能力和接收环境的终端自适应选择使用， 最大 限度地提高用户的体验质量。 这种方法的缺陷是两个复用内容存在一定的 冗余， 信道带宽浪费较大。
其后有人在上述方法基础上进行改进， 针对分级调制釆用视频分级编 码方式传送同一视频内容的两个层次信息， 基本层码流可以单独解码， 增 强层码流包含用于提高基本层码流质量的附加信息。 视频分级编码器可以 对视频内容源进行编码， 产生 L+1层码流。 其中包括一路可独立解码的基 本层码流， 另外还包括 L路增强层码流， 增强层码流中含有用于提高基本 层码流质量的附加信息， 需要与基本层一起解码， 提高视频质量。 所有层 的码流会聚起来提供最高的视频质量。 目前主要的视频分级编码方式是可 伸缩视频编码 ( SVC, Scalable Video Coding )„ CMMB标准中规定了在广播业务频率范围内， 移动多媒体广播系统广 播信道传输信号的帧结构、 信道编码和调制方式。 CMMB标准 《移动多媒 体广播第 2部分： 复用》 中规定， 釆用复用子帧来封装视频、 音频等流媒 体数据传送。 图 1为 CMMB信道帧的组成结构示意图， 如图 1所示， 一个 CMMB信道帧分为 40个时隙， 每个时隙为 25ms , —个复用帧可以任意占 用一个或多个时隙， 复用帧由复用帧标识 MF_ID进行标识， MF_ID等于 0 时代表控制信道复用帧， 不等于 0的为普通复用帧。 时隙 0传输复用帧的 控制信息， 也即控制信息复用帧， 控制信息复用帧由帧头和控制信息表组 成。 一个复用帧由复用帧头、 复用帧净荷和填充组成， 各种业务数据均在 复用净荷中承载。 复用帧净荷又分为多个复用子帧， 每个复用子帧用于传 输一个业务。 每个复用子帧由复用子帧头和载荷组成， 载荷又由段组成， 段分为音频段、 视频段和数据段， 分别承载业务的视频数据、 音频数据和 其他数据。
但 CMMB系统并不支持分级调制， 如何在 CMMB系统中支持分级编 码视频业务目前并没有相关的解决方案。 发明内容
有鉴于此， 本发明的主要目的在于提供一种移动多媒体广播系统中分 级传送、 接收方法与装置， 能在 CMMB系统中对视频业务进行分级传送， 从而能满足用户终端的多级别业务需求。
为达到上述目的， 本发明的技术方案是这样实现的：
一种移动多媒体广播系统中分级传送方法， 包括：
将视频业务中的视频流依次分为基本层码流和至少一个增强层码流， 并将所述基本层码流和至少一个增强层码流按其所属的层分别封装于广播 信道帧中的不同复用子帧中， 同时将所述视频流各层码流所在的复用子帧 的位置信息封装于所述广播信道帧中并发送至接收端。 优选地， 所述各层码流所在的复用子帧之间的间隔为设定阔值的时长。 优选地， 所述各层码流所在的复用子帧所属的复用帧不同。
优选地， 所述各层码流所在的复用子帧的帧号相同。
优选地， 所述视频业务中的音频流及数据流承载于基本层码流所在的 复用子帧中。
一种移动多媒体广播系统中分级接收方法， 包括：
监听广播信道帧中视频业务中视频流的各层码流所在的复用子帧的位 置信息， 接收终端根据自身的视频流处理能力接收基本层码流， 或接收基 本层码流及对应的增强层码流， 对基本层码流、 或基本层码流及对应的增 强层码流进行解码， 输出基本层码流的视频数据、 或基本层码流与增强层 码流合并后的视频数据。
优选地， 所述还包括：
对基本层码流解码时， 一并对视频业务中的音频流及数据流进行解码。 一种移动多媒体广播系统中分级传送装置， 包括：
分层单元， 用于将视频业务中的视频流依次分为基本层码流和至少一 个增强层码流；
第一封装单元， 用于将所述基本层码流和至少一个增强层码流按其所 属的层分别封装于广播信道帧中的不同复用子帧中；
位置信息生成单元， 用于生成所述视频流各层码流所在的复用子帧的 位置信息；
第二封装单元， 用于将所述视频流各层码流所在的复用子帧的位置信 息封装于所述广播信道帧中； 以及
发送单元， 用于将所述广播信道帧发送至接收端。
优选地， 所述视频流各层码流所在的复用子帧之间的间隔为设定阔值 的时长。 优选地， 所述视频流各层码流所在的复用子帧所属的复用帧不同。 优选地， 所述视频流各层码流所在的复用子帧的帧号相同。
一种移动多媒体广播系统中分级接收装置， 包括：
监听单元， 用于监听广播信道帧中视频业务中视频流的各层码流所在 的复用子帧的位置信息；
接收单元， 用于根据该接收单元所属接收终端的视频流处理能力接收 基本层码流， 或接收所述基本层码流及对应的增强层码流；
解码单元， 用于对所述基本层码流、 或所述基本层码流及对应的增强 层码流进行解码； 以及
输出单元， 用于输出所述基本层码流的视频数据、 或所述基本层码流 与增强层码流合并后的视频数据。
本发明中， 对视频业务中的视频流进行分级编码， 将各分级视频流分 别封装到 CMMB广播信道帧的不同复用子帧中， 在发送视频流数据时， 将 各分级视频流在 CMMB广播信道帧承载的复用子帧中的位置信息一并发送 至接收端，接收端通过监听 CMMB广播信道帧中承载各分级视频流的复用 子帧的位置信息， 以及该接收终端所支持的视频流解码能力， 确定仅接收 基本层码流或接收基本层码流及其对应的增强层码流， 将所接收的基本层 码流或基本层码流及其对应的增强层码流进行解码， 输出给用户。 本发明 发送分级视频流数据不需要独立信道， 各级视频流数据可共用相同的信道 层和调制层， 使 CMMB系统能自动后向兼容不支持分级解码的接收终端， 接收终端可根据自身条件选择接收基本层数据或基本层数据及其对应的增 强层数据。 附图说明
图 1为 CMMB信道帧的组成结构示意图；
图 2为本发明移动多媒体广播系统中分级传送方法的流程图； 图 3为本发明广播信道帧的组成结构示意图；
图 4为本发明移动多媒体广播系统中分级接收方法的流程图； 图 5为本发明移动多媒体广播系统中分级传送装置的组成结构示意图； 图 6为本发明移动多媒体广播系统中分级接收装置的组成结构示意图。 具体实施方式
本发明的基本思想是： 对视频业务中的视频流进行分级编码， 将各分 级视频流分别封装到 CMMB广播信道帧的不同复用子帧中，在发送视频流 数据时，将各分级视频流在 CMMB广播信道帧承载的复用子帧中的位置信 息一并发送至接收端，接收端通过监听 CMMB广播信道帧中承载各分级视 频流的复用子帧的位置信息， 以及该接收终端所支持的视频流解码能力， 确定仅接收基本层码流或接收基本层码流及其对应的增强层码流， 将所接 收的基本层码流或基本层码流及其对应的增强层码流进行解码， 输出给用 户。 本发明发送分级视频流数据不需要独立信道， 各级视频流数据可共用 相同的信道层和调制层，使 CMMB系统能自动后向兼容不支持分级解码的 接收终端， 接收终端可根据自身条件选择接收基本层数据或基本层数据及 其对应的增强层数据。 本发明方案实现简单且实用。
为使本发明的目的、 技术方案和优点更加清楚明白， 以下举实施例并 参照附图， 对本发明进一步详细说明。
图 2为本发明移动多媒体广播系统中分级传送方法的流程图， 如图 2 所示， 本发明移动多媒体广播系统中分级传送方法包括以下步骤：
步骤 201 :将视频业务中的视频流依次分为基本层码流和至少一个增强 层码流， 并将所述基本层码流和至少一个增强层码流按其所属的层分别封 装于广播信道帧中的不同复用子帧中， 同时将所述视频流各层码流所在的 复用子帧的位置信息封装于所述广播信道帧中。
对视频业务中的视频流釆用前述的 SVC方式进行编码， 编码后生成一 个基本层码流和一个以上的增强层码流， 其中， 基本层码流包括基本的视 频数据流， 以及视频业务中的音频及其他基本数据信息； 该基本层码流针 对的普通的接收终端， 接收终端通过解码基本层码流能获得基本的视频业 务， 但所获得的基本视频业务的画面质量一般。 而增强层码流则是对视频 业务中的视频画面的优化， 其需要在基本层码流解码数据的基础上才能实 现优化， 对于支持高级视频处理的接收终端而言， 除了接收基本层码流数 据外， 同时接收相应的增强层码流， 分别解码基本层码流及其对应的增强 层码流， 将会获得非常好的视频画面， 从而体现出视频服务的优质化。
对于基本层码流和增强层码流， CMMB系统将各层码流数据作为不同 的业务， 基本层码流、 增强层码流按其所属的层的不同而承载于广播信道 帧中不同的复用子帧中。 为保证视频流接收的可靠性， 承载各层码流的复 用子帧之间最好有一定的时间间隔， 以使 CMMB系统支持多广播业务。 各 层码流的复用子帧最好位于不同的复用帧中， 为使各层码流所在的复用子 帧的位置信息较简单的描述， 各层码流最好位于各复用帧中编号相同的复 用子帧中。 一般而言， 视频流所分的层并不会特别多， 一般为二到三层， 也即是说， 一个基本层码流对应的增强层码流一般为一个到两个， 因此， 分级视频流并不会大量占用 CMMB信道广播帧的资源。 以下通过一示例进 一步描述本发明技术方案的实质。
设视频业务 S为包含一路视频数据加一路伴音的电视业务，视频业务 S 的视频编码釆取 SVC进行， 编码后生成一路基本层视频码流和一路增强层 视频码流。 图 3为本发明广播信道帧的组成结构示意图， 如图 3所示， 某 频点 F上有 40个时隙， 其中时隙 0 (即复用帧 0 )用于传送控制信息， 时 隙 1至时隙 39用于传送业务信息。复用器将视频业务 S的视频基本层码流、 音频以及其他基本数据信息配置在复用帧 1中， 占用时隙 1至时隙 4, 复用 子帧号为 1。 视频业务 S的视频增强层码流配置为复用帧 2, 占用时隙 5至 时隙 6, 复用子帧号为 1。 复用帧 1和复用帧 2中不再传输其他业务。 在业 务的控制信息和电子业务指南 （ESG, Electronic Service Guide )信息中添 加承载各层 （基本层码流及其对应的各增强层码流）码流的复用帧位置的 描述信息， 该描述信息标明视频业务 S包含两个复用子帧： 复用帧 1的复 用子帧 1为业务基本层码流数据， 复用帧 2的复用子帧 1为增强层码流数 据。
复用器获取视频业务 S的基本层码流 VI , 封装到复用帧 1的复用子帧 1中， 获取视频业务 S的增强层码流 V2,封装到复用帧 2的复用子帧 1中。 复用器获取视频业务 S的音频码流及其他基本数据段信息，添加到复用帧 1 的复用子帧 1 中， 即与基本层码流一起承载于同一个复用子帧中。 承载各 层码流的复用帧位置的描述信息， 承载于广播信道帧中的复用帧 0 中， 以 指示接收终端各层码流的复用帧位置， 以方便其接收视频业务 s。
步骤 202: 传送所述广播信道帧。
复用器输出承载各级码流的复用帧， 经调制和发射形成广播信号。 仍 以前述示例进行说明： 复用器输出完整的复用帧 1和复用帧 2, 经调制和发 射形成广播。
图 4为本发明移动多媒体广播系统中分级接收方法的流程图， 如图 4 所示， 本发明移动多媒体广播系统中分级接收方法包括以下步骤：
步骤 401 :接收终端监听广播信道帧中视频业务中视频流的各层码流所 在的复用子帧的位置信息， 并根据自身的视频流处理能力接收基本层码流， 或接收基本层码流及对应的增强层码流。
接收终端监听广播信道帧中的复用帧 0, 接收控制信息及 ESG信息， 以正确接收多媒体广播业务， 同时监听到的， 还包括分级视频业务中各层 码流所在的复用子帧的位置信息， 接收终端根据自身的处理能力， 判决仅 接收基本层码流所在的复用子帧， 还是接收基本层码流及其对应的增强层 码流， 需要注意的是， 接收终端所接收增强层码流也是根据处理能力来决 定的， 处理能力强的接收终端， 能处理系统所传送的所有增强层码流， 而 接收终端能力稍差的仅能接收该接收终端能力对应的增强层码流， 当然， 接收终端所能获得的视频业务的画面质量也不相同， 处理能力强的接收终 端所获得的视频业务的画面相对较好， 或者， 能满足相应的视频业务功能， 如支持立体播放效果等。 基本的接收终端仅能接收基本层的码流， 并输出 基本的视频画面。
步骤 402:对基本层码流、或基本层码流及对应的增强层码流进行解码， 输出基本层码流的视频数据、 或基本层码流与增强层码流合并后的视频数 据。
接收终端对所接收到的基本层码流、 或基本层码流及对应的增强层码 流进行解码， 输出基本层码流所对应的视频业务， 而对于接收到增强层码 流的接收终端， 将所接收到的基本层码流及其增强层码流分别进行解码， 并将基本层码流及其增强层码流中的视频流数据进行合并， 输出画面质量 更佳或支持相应功能（如立体播放功能） 的视频业务。
图 5为本发明移动多媒体广播系统中分级传送装置的组成结构示意图， 如图 5所示，本发明移动多媒体广播系统中分级传送装置包括分层单元 50、 第一封装单元 51、位置信息生成单元 52、 第二封装单元 53和发送单元 54, 其中， 分层单元 50用于将视频业务中的视频流依次分为基本层码流和至少 一个增强层码流； 分层单元 50可通过 SVC编码器而实现。 第一封装单元 51用于将所述基本层码流和至少一个增强层码流按其所属的层分别封装于 广播信道帧中的不同复用子帧中； 位置信息生成单元 52用于生成所述视频 流各层码流所在的复用子帧的位置信息； 第二封装单元 53用于将所述视频 流各层码流所在的复用子帧的位置信息封装于所述广播信道帧中； 发送单 元 54用于将所述广播信道帧发送至接收端。 基本层码流、 增强层码流按其 所属的层的不同而承载于广播信道帧中不同的复用子帧中。 为保证视频流 接收的可靠性， 承载各层码流的复用子帧之间最好有一定的时间间隔， 以 使 CMMB系统支持多广播业务。各层码流的复用子帧最好位于不同的复用 帧中， 为使各层码流所在的复用子帧的位置信息较简单的描述， 各层码流 最好位于各复用帧中编号相同的复用子帧中。
图 5 所示的移动多媒体广播系统中分级传送装置适用于 CMMB 系统 侧。
本领域技术人员应当理解， 图 5 所示的移动多媒体广播系统中分级传 送装置中的各处理单元的实现功能可参照前述图 2 中的相关描述而理解。 图 5 所示的移动多媒体广播系统中分级传送装置中各单元的功能可通过运 行于处理器上的程序而实现， 也可通过具体的逻辑电路而实现。
图 6为本发明移动多媒体广播系统中分级接收装置的组成结构示意图， 如图 6所示，本发明移动多媒体广播系统中分级接收装置包括监听单元 60、 接收单元 61、 解码单元 62和输出单元 63 , 其中， 监听单元 60用于监听广 播信道帧中视频业务中视频流的各层码流所在的复用子帧的位置信息； 接 收单元 61用于根据该接收单元 61所属的接收终端的视频流处理能力接收 基本层码流， 或接收所述基本层码流及对应的增强层码流； 解码单元 62用 于对所述基本层码流、 或所述基本层码流及对应的增强层码流进行解码； 输出单元 63用于输出所述基本层码流的视频数据、 或所述基本层码流与增 强层码流合并后的视频数据。
图 6所示的移动多媒体广播系统中分级接收装置适用于接收终端侧。 本领域技术人员应当理解， 图 6所示的移动多媒体广播系统中分级接 收装置中的各处理单元的实现功能可参照前述图 4 中的相关描述而理解。 图 6所示的移动多媒体广播系统中分级接收装置中各单元的功能可通过运 行于处理器上的程序而实现， 也可通过具体的逻辑电路而实现。 以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种移动多媒体广播系统中分级传送方法， 其特征在于， 所述方法 包括：
将视频业务中的视频流分为基本层码流和至少一个增强层码流， 将所 述基本层码流和至少一个增强层码流按其所属的层分别封装于广播信道帧 中的不同复用子帧中， 将所述视频流各层码流所在的复用子帧的位置信息 封装于所述广播信道帧中并发送。
2、 根据权利要求 1所述的方法， 其特征在于， 所述各层码流所在的复 用子帧之间的间隔为设定阔值的时长。
3、 根据权利要求 1所述的方法， 其特征在于， 所述各层码流所在的复 用子帧所属的复用帧不同。
4、 根据权利要求 3所述的方法， 其特征在于， 所述各层码流所在的复 用子帧的帧号相同。
5、 根据权利要求 1所述的方法， 其特征在于， 所述视频业务中的音频 流及其他基本数据流承载于基本层码流所在的复用子帧中。
6、 一种移动多媒体广播系统中分级接收方法， 其特征在于， 所述方法 包括：
接收终端监听广播信道帧中视频业务中视频流的各层码流所在的复用 子帧的位置信息， 并根据该接收终端的视频流处理能力接收基本层码流， 或接收基本层码流及对应的增强层码流； 对所述基本层码流、 或所述基本 层码流及对应的增强层码流进行解码， 输出基本层码流的视频数据、 或基 本层码流与增强层码流合并后的视频数据。
7、 根据权利要求 6所述的方法， 其特征在于， 所述还包括： 对基本层码流解码时， 对视频业务中的音频流及其他基本数据流一起 进行解码。
8、 一种移动多媒体广播系统中分级传送装置， 其特征在于， 所述装置 包括分层单元、 第一封装单元、 位置信息生成单元、 第二封装单元和发送 单元； 其中，
分层单元， 用于将视频业务中的视频流依次分为基本层码流和至少一 个增强层码流；
第一封装单元， 用于将所述基本层码流和至少一个增强层码流按其所 属的层分别封装于广播信道帧中的不同复用子帧中；
位置信息生成单元， 用于生成所述视频流各层码流所在的复用子帧的 位置信息；
第二封装单元， 用于将所述视频流各层码流所在的复用子帧的位置信 息封装于所述广播信道帧中；
发送单元， 用于将所述广播信道帧发送至接收端。
9、 根据权利要求 8所述的装置， 其特征在于， 所述视频流各层码流所 在的复用子帧之间的间隔为设定阔值的时长。
10、 根据权利要求 8所述的装置， 其特征在于， 所述视频流各层码流 所在的复用子帧所属的复用帧不同。
11、 根据权利要求 10所述的装置， 其特征在于， 所述视频流各层码流 所在的复用子帧的帧号相同。
12、 一种移动多媒体广播系统中分级接收装置， 其特征在于， 所述装 置包括监听单元、 接收单元、 解码单元和输出单元； 其中，
监听单元， 用于监听广播信道帧中视频业务中视频流的各层码流所在 的复用子帧的位置信息；
接收单元， 用于根据该接收单元所属的接收终端的视频流处理能力接 收基本层码流， 或接收所述基本层码流及对应的增强层码流；
解码单元， 用于对所述基本层码流、 或所述基本层码流及对应的增强 层码流进行解码；
输出单元， 用于输出所述基本层码流的视频数据、 或所述基本层码流 与增强层码流合并后的视频数据。
PCT/CN2010/072958 2009-07-07 2010-05-19 移动多媒体广播系统中分级传送、接收方法与装置 WO2011003302A1 (zh)

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