SMPTE ST 362M-2002 Television - Object Data Format for the Exchange of DV-Based Audio Data and Compressed Video Using ATM Common Layer over Asychronous Transfer Mode (ATM) AAL Type.pdf
《SMPTE ST 362M-2002 Television - Object Data Format for the Exchange of DV-Based Audio Data and Compressed Video Using ATM Common Layer over Asychronous Transfer Mode (ATM) AAL Type.pdf》由会员分享,可在线阅读,更多相关《SMPTE ST 362M-2002 Television - Object Data Format for the Exchange of DV-Based Audio Data and Compressed Video Using ATM Common Layer over Asychronous Transfer Mode (ATM) AAL Type.pdf(14页珍藏版)》请在麦多课文档分享上搜索。
1、SMPTE STANDARD for Television - SMPTE 362M-2002 Object Data Format for the Exchange of DV-Based Audio, Data and Compressed Video using ATM Common Layer over Asynchronous Transfer Mode (ATM) AALType 1 1 Scope This standard defines the object data format for the exchange of DV-based audio, data, and c
2、ompressed video (which data structure is defined in SMPTE 314M) over the common layer defined in SMPTE 354M. The standard covers the transmission of audio, compressed video, and subcode data with DV-based 25-Mb/s and 5O-Mb/s data structures for 525/60 and 625/50 systems and the transmission of the h
3、eader data of serial data transport interface defined in SMPTE 305.2M. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are sub
4、ject to revi- sion, and patties to agreements based on this standard are encouraged to investigate the possibii of applying the most recent edition of the standards indicated below. SMPTE 305.2M-2000, Television - Serial Data Transport Interface (SDTI) SMPTE 314M-1999, Television - Data Structure fo
5、r DV-Based Audio, Data and Compressed Video - 25 and 50 Mb/s SMPTE 354M, Television - ATM Common Layer for Transport of Packetized Audio, Video and Data over Asynchronous Transfer Mode using ATM Adapta- tion Layer Type 1 3 Common layer As defined in SMPTE 354M, the common layer is the next higher la
6、yer of theAAL1 and provides transmission Page 1 of 14 pages packets of applications. The common layer consists of two layers: the lower layer is the SYNC layer and the higher layer is the container layer. 3.1 SYNC layer TheSYNC stream block (SSB), which is defined in the SYNC layer, includes contain
7、ers. The SSB has one or more containers, and the transmission order of the SSB is defined in SMPTE 354M. 3.2 Container layer The container layer defines the structure of the con- tainer in the SSB. Each container is intended to hold a video frame (optionally two fields) worth of packet- zed audio, v
8、ideo, and data. 3.2.1 Container format The container has two basic modes: the simple mode and the extended header mode. The simple mode supports four objects of several restricted types. The extended header mode supports up to 16 objects. 3.2.2 Object classification system As described in SMPTE 354M
9、, the container system provides a mechanism for defining the bit and byte packing of audio-video data types. Object classifi- cation is represented in the header by the object class word. This word is composed of two key elements: the type byte and the index byte object. The type byte is a coarse cl
10、assification of the data type, and the index type is the key into the table (which is defined in figure 6 of SMPTE 354M ) which represents data types. Copyright02002 by THESOCIRYOF MOTION PICTURE AND TELNISION ENGINEERS 595 W. Hartcdale Ave., White Plains, NY 10m7 (914) 761-1100 Approved January 31,
11、2002 SMPTE 362M-2002 Stream Stream Time CDS Packet Descriptor Stamp Length 3.2.3 Compressed AV stream Video program is defined as an object class 20h and compressed AV stream (dv-based) is defined as table index 0001h of the video program object in SMPTE 354M. The format of a compressed AV stream is
12、 based on the subcontainer format shown in figure 1. The subcontainer is composed of a 12-byte stream header and multiple/single compressed data stream (CDS) packets. 3.2.3.2.1 Packet type The packet type is 16-bit data and indicates the CDS packet structure. The packet type is defined as follows: -
13、 Bit 31: The existence indication bit of the packet time stamp word. O - indicates that the packet time stamp word exists. 1 - indicates that the packet time stamp word does not exist. - Bit 30: The existence indication bit of the byte count word. 3.2.3.1 Stream header The stream header, which is sh
14、own in figure 1, is composed as follows: Stream descriptor: 32 bits (4 bytes) Stream time stamp: 32 bits (4 bytes) CDS packet length: 32 bits (4 bytes) 3.2.3.2 Stream descriptor The stream descriptor (which is shown in figure 2 ) is composed of the following: Packet type: 16 bits (2 bytes) Stream ty
15、pe: 16 bits (2 bytes) O - indicates that the byte count word exists. 1 - indicates that the byte count word does not exist. - Bit 29: The existence indication bit of the FEC (forward error correction) word. O - indicates that the FEC word exists. 1 - indicates that the FEC word does not exist. - Bit
16、 28: The indication bit that indicates multiple packets or single packet. O - indicates that the subcontainer is composed of 1 - indicates that the subcontainer is composed of a single CDS packet. multiple CDS packets. 31 16 15 O I I Packet Type Stream Type I Figure 2 - Stream descriptor Page 2 of 1
17、4 pages SMPTE 362M-2002 - Bit 27: The indication bit that indicates that the stream time stamp word is valid or invalid. O - indicates that the stream time stamp word is 1 - indicates that the stream time stamp word is valid. invalid. - Bit 26: The indication bit that indicatesfixed-packet size or v
18、ariable-packet size. O - indicates that the CDS packet size is fixed. 1 - indicates that the CDS packet size is variable and the CDS packet length word is invalid. - Bit 25 and Bit 24: Reserved for future purposes (default value is hex 00). - Bit 23 through Bit 16: Indicates the byte length of FEC.
19、3.2.3.2.2 Stream type The stream type is 16-bit data. The definition of the stream typedepends on the compressed data stream. 3.2.3.5.1 CDS packet time stamp The CDS packet time stamp is a 32-bit word and exists when B31 of the packet type is set to O. The CDS packet time stamp is used for recoverin
20、g the relative CDS packet timing from end to end. The reference clock for the packet time stamp is the same frequency as that for the object time stamp in the container header. The synchronization scheme using this word is described later. 3.2.3.5.2 Byte count The byte count is a 32-bit word and exi
21、sts when 830 of the packet type is set to O. The byte count indicates the byte length of the variable CDS packet payload size or the valid byte length in the fixed CDS packet payload. If the packet time stamp word does not exist, the byte count word is located at the head word of the CDS packet. 3.2
22、.3.5.3 CDS packet payload The CDS packet payload format depends on the compressed data stream. 3.2.3.5.4 FEC (forward error correction) 3.2.3.3 Stream time stamp The stream timestamp is composed of a 32-bit packet length word and indicates the point of time at which the compressed AV stream object i
23、s multiplexed into the container. The stream time stamp is used for recovering the relative stream object time from end to end and is valid when B27 of the packet type is set to O. The synchronization scheme using this word is described later. 3.2.3.4 CDS packet length The CDS packet length is compo
24、sed of a 32-bit packet length word and indicates the byte length of the CDS packet multiplexed immediately after the stream header. The CDS packet length word is valid when 827 of the packet type is set to O. 3.2.3.5 CDS packet format The CDS packet format is composed of a 32-bit packet time stamp w
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- SMPTEST362M2002TELEVISIONOBJECTDATAFORMATFORTHEEXCHANGEOFDVBASEDAUDIODATAANDCOMPRESSEDVIDEOUSINGATMCOMMONLAYEROVERASYCHRONOUSTRANSFERMODEATMAALTYPEPDF

链接地址:http://www.mydoc123.com/p-1046941.html