1、 Copyright 2011 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved June 30, 2011 Table of Contents Page Foreword . 2 Intellectual Property 2 Introduction 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 4 4 Gener
2、al Description . 4 4.1 Source Image 4 4.2 Timing Reference Codes 5 4.3 Ancillary Data 5 4.4 Audio Data 5 4.5 Time Code . 5 4.6 Video Payload Identifier 5 4.7 Viewable Content 6 5 VC-2 Level 65 Bitstream Mapping . 6 6 Interface Data Format 7 6.1 Compressed Data Mapping 7 6.2 Viewable Picture . 8 6.3
3、Creating a Viewable Picture (Informative) . 8 Annex A Effect of Halftone Dither (Informative) . 10 Page 1 of 10 pages SMPTE ST 2047-4:2011 SMPTE STANDARD Carriage of Level 65 VC-2 Compressed Video Over the SDTV SDI SMPTE ST 2047-4:2011 Page 2 of 10 pages Foreword SMPTE (the Society of Motion Picture
4、 and Television Engineers) is an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices and Engine
5、ering Guidelines, are prepared by SMPTEs Technology Committees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in acc
6、ordance with the rules given in Part XIII of its Administrative Practices. SMPTE ST 2047-4 was prepared by Technology Committee 32NF. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation of this Standard. However
7、, attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights. Introduction This section is entirely informative and does not form an integral part of this Engi
8、neering Document. This standard defines the provisions for mapping VC-2 bitstreams onto a 270 Mbit/s SDTV SDI link and describes a method by which additional bits are added to ensure that the resultant signal can be viewed on a SDTV SDI monitor, albeit in a somewhat noisy form. The VC-2 compression
9、standard (SMPTE ST 2042-1) defines a generic intra-frame compression system that can handle all defined video formats and more. A companion recommended practice (SMPTE RP 2047-3) defines constraints (defined as level 65) on the VC-2 specification such that high definition source video images (1080 l
10、ine interlaced or 720 line progressive) can be compressed such that the resulting compressed bit-rate that can be carried over an SDTV SDI link operating at 270 Mbit/s. A key feature of this specification is that the transport of compressed data in this way is backwards compatible with installed equ
11、ipment. The compressed video is mapped entirely into active picture and the signal on the link includes viewable video signal. This aids compatibility with existing equipment such routing and monitoring apparatus and also uncompressed standard definition recording apparatus. An important feature of
12、this mapping process is that it can be implemented in a practical form using currently available firmware and hardware. SMPTE ST 2047-4:2011 Page 3 of 10 pages 1 Scope This standard defines the method of mapping VC-2 data onto an SDTV SDI link operating at 270Mbps, based upon the data structures def
13、ined in SMPTE ST 259 and ITU-R BT 656 to transport the compressed HD video formats listed in Table 1. The compressed HD video formats supported by this standard are those supported by the low delay profile of VC-2 at level 65. These formats are 1080I at 50 or 60/1.001 fields/s (i.e., SMPTE ST 274 sy
14、stems 5 and 6), and 720P at 50 or 60/1.001 frames/s (i.e., SMPTE ST 296 systems 2 and 3). Additionally VC-2 level 65 supports the compression of SMPTE ST 274 systems 5 and 6 in which the horizontal sample rate has been reduced to 1440 pixels. Table 1 Supported HD Video Formats The SDTV SDI link defi
15、ned herein supports the carriage of embedded audio, ancillary data and payload identification. A signal coded in accordance with this standard incorporates a noisy but recognizable picture that can be viewed using a standard SMPTE ST 259 / ITU-R BT 656 video monitor. 2 Conformance Notation Normative
16、 text is text that describes elements of the design that are indispensable or contains the conformance language keywords: “shall“, “should“, or “may“. Informative text is text that is potentially helpful to the user, but not indispensable, and can be removed, changed, or added editorially without af
17、fecting interoperability. Informative text does not contain any conformance keywords. All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as “Informative“ or individual paragraphs that start with “Note:” The keywords “shall“ and “shall not“ i
18、ndicate requirements strictly to be followed in order to conform to the document and from which no deviation is permitted. The keywords, “should“ and “should not“ indicate that, among several possibilities, one is recommended as particularly suitable, without mentioning or excluding others; or that
19、a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within the limits of the document. Format Name Fra
20、me Height Frame Width Frame Rate (Hz) Scanning Format Standard System Number 1920x1080/60/I 1080 1920 29.97 interlace SMPTE ST 274 5 1920x1080/50/I 1080 1920 25 interlace SMPTE ST 274 6 1440x1080/60/I 1080 1440 29.97 interlace SMPTE RP 2047-3 5 1440x1080/50/I 1080 1440 25 interlace SMPTE RP 2047-3 6
21、 1280x720/60/P 720 1280 59.94 progressive SMPTE ST 296 2 1280x720/50/P 720 1280 50 progressive SMPTE ST 296 3 SMPTE ST 2047-4:2011 Page 4 of 10 pages The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be defined in the future. The keyword “forbi
22、dden” indicates “reserved” and in addition indicates that the provision will never be defined in the future. A conformant implementation according to this document is one that includes all mandatory provisions (“shall“) and, if implemented, all recommended provisions (“should“) as described. A confo
23、rmant implementation need not implement optional provisions (“may“) and need not implement them as described. Unless otherwise specified, the order of precedence of the types of normative information in this document shall be as follows: Normative prose shall be the authoritative definition; Tables
24、shall be next; followed by formal languages; then figures; and then any other language forms. 3 Normative References Note: All references in this document to other SMPTE documents use the current numbering style (e.g. SMPTE ST 12-2:2008) although, during a transitional phase, the document as publish
25、ed (printed or PDF) may bear an older designation (such as SMPTE 12M-2-2008). Documents with the same root number (e.g. 12-2) and publication year (e.g. 2008) are functionally identical. The following standards contain provisions which, through reference in this text, constitute provisions of this s
26、tandard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE ST 12-2:2008, Tele
27、vision Transmission of Time Code in the Ancillary Data Space SMPTE ST 259:2008, Television SDTV Digital Signal/Data Serial Digital Interface SMPTE ST 272:2004, Television Formatting AES/EBU Audio and Auxiliary Data into Digital Video Ancillary Data Space SMPTE ST 274:2008, Television 1920 x 1080 Ima
28、ge Sample Structure, Digital Representation and Digital Timing Reference Sequences for Multiple Picture Rates SMPTE ST 291:2010, Ancillary Data Packet and Space Formatting SMPTE ST 296:2001, Television 1280 720 Progressive Image Sample Structure Analog and Digital Representation and Analog Interface
29、 SMPTE ST 352:2011, Video Payload Identification Codes for Serial Digital Interfaces SMPTE ST 2042-1:2009, VC-2 Video Compression SMPTE RP 2047-3:2011, VC-2 Level 65 Compression of High Definition Video Sources for use with a Standard Definition Infrastructure Recommendation ITU-R BT.656-5 (12/07),
30、Interface for Digital Component Video Signals in 525-Line and 625-Line Television Systems Operating at the 4:2:2 Level of Recommendation ITU-R BT.601 4 General Description 4.1 Source image formats The data for this interface shall be derived from the following source image sampling formats as specif
31、ied in SMPTE RP 2047-3: SMPTE ST 274 systems 5 and 6; i.e., 1920 pixels by 1080 lines, interlaced, 10 bit, 4:2:2 video at either 50 field/s or 60/1.001 field/s. SMPTE ST 2047-4:2011 Page 5 of 10 pages SMPTE ST 274 systems 5 and 6, in which the horizontal sample count has been reduced to 1440 pixels.
32、 SMPTE ST 296 systems 2 and 3; i.e., 1280 pixels by 720 lines, progressive, 10 bit, 4:2:2 video at either 50 frames/s or 60/1.001 frames /s. 4.2 Timing Reference Codes Timing Reference codes shall be in conformance with those specified in either SMPTE ST 259 or ITU-R BT.656-5 corresponding to the fi
33、eld or the frame rate of the source image format. For interlaced source image formats their field rate shall be the same as field rate on the SDI link. For progressive source image formats their frame rate shall be the same as the field rate on the SDI link. 4.3 Ancillary Data Ancillary data, if pre
34、sent, shall be mapped into the blanking area in conformance with SMPTE ST 291. 4.4 Audio Data Audio data, if present, shall be mapped into the ancillary data space in conformance with SMPTE ST 272. 4.5 Time Code Time code, if present, shall be mapped into the ancillary data space in conformance with
35、 SMPTE ST 12-2. 4.6 Video Payload Identifier The payload identifier shall be present and shall be mapped into the ancillary data space in conformance with SMPTE ST 352. The first byte of the payload identifier shall be used to identify the combination of video payload format and digital interface tr
36、ansport. For an interface in accordance with this standard Byte 1 shall be set to B2h. Bytes 2 and 3 of the payload identifier shall be set in accordance with the picture rate, sampling structure, and aspect ratio etc. of the image being carried on the interface as shown in Table 2. Byte 4 of the pa
37、yload identifier shall be used to identify the compressed payload. The meaning of byte 4 shall depend on the values of bytes 2 and 3 as shown in Table 3. Table 2 Video Payload Identifier Definition Bits Byte 1 Byte 2 Byte 3 Byte 4 Bit 7 1 0 (Interlaced transport) 1 (Image aspect ratio: 16:9) 0 Bit 6
38、 0 0 (Interlaced picture) 0 (Reserved) 0 Bit 5 1 00 (VC-2 compression) 0 (Reserved) 0 Bit 4 1 0 (Reserved) 0 Bit 3 0 Picture Rate (see SMPTE ST 352 Table 2) 0h (Sampling structure: 4:2:2 Y/Cb/Cr) 0 Bit 2 0 See Table 3 Bit 1 1 See Table 3 Bit 0 0 See Table 3 SMPTE ST 2047-4:2011 Page 6 of 10 pages Ta
39、ble 3 Compressed Payload Formats Byte 2 Byte 3 Byte 4 Format Name 0x06 (Picture rate = 30/1.001 Hz) 0x80 0x01 1920x1080/60/I 0x05 (Picture rate = 25 Hz) 0x80 0x02 1920x1080/50/I 0x06 (Picture rate = 30/1.001 Hz) 0x80 0x05 1440x1080/60/I 0x05 (Picture rate = 25 Hz) 0x80 0x06 1440x1080/50/I 0x0A (Pict
40、ure rate = 60/1.001 Hz) 0x80 0x03 1280x720/60/P 0x09 (Picture rate = 50 Hz) 0x80 0x04 1280x720/50/P Byte 2, bits 4 and 5 shall be set to 00 to indicate that VC-2 syntax is used to compress the source video signal. Byte 4 shall be set as shown in Table 3 to indicate the carriage of the VC-2 compresse
41、d payload and the viewable video data according to this standard. The formats indicated in Table 3 are per SMPTE RP 2047-3. 4.7 Viewable Content A signal coded in accordance with this interface should produce a recognizable version of the compressed payload (although noisy and coarsely quantized) wh
42、en decoded and displayed by a SMPTE ST 259 / ITU-R BT 656 compliant receiving interface as if it were a standard definition interlaced signal. 5 VC-2 Level 65 Bitstream Mapping This section defines which data from a VC-2 Level 65 bitstream according to SMPTE RP 2047-3 is mapped into the SDI signal.
43、Consecutive VC-2 pictures shall be mapped to consecutive SDI fields. Hence each SDI frame is used to transport two VC-2 compressed pictures of the source image format. Note: Compliance with VC-2 level 65 ensures that VC-2 pictures correspond to either a field or a frame in the input source video dep
44、ending on whether the input source video is interlaced or progressive respectively. A compressed VC-2 stream comprises data and metadata. The metadata describes the parameters of the coded signal and the way in which it is encoded. The data describes the details of the specific video signal that has
45、 been compressed. When a VC-2 stream is transported over a SDI link according to this specification, the stream metadata shall be inferred from the payload identifier (defined in Section 4.6). Therefore, it is only the data from the VC-2 stream that is mapped to the SDI link. The signal data part of
46、 a VC-2 stream shall comprise the transform data part, as defined in Sections 12.4 and 12.5 of SMPTE ST 2042-1, VC-2 Video Compression. The signal data part of each VC-2 picture shall be SMPTE ST 2047-4:2011 Page 7 of 10 pages mapped into the active picture area of one field within the SDI signal. I
47、n this specification an active field means 720 pixels by either 288 or 243 standard definition lines for 50 or 59.94 field/s video respectively. No metadata from the VC-2 stream shall be mapped into the SDI signal (except by inference from the payload identifier). The complete VC-2 stream (with the
48、exception of VC-2 “Picture Numbers” defined in Section 11.1 of the VC-2 specification) can be reconstructed from the transform data present on the SDI and the metadata inferred from the payload identifier. Note: The metadata to be inferred from the payload identifier is defined and enumerated in det
49、ail in SMPTE RP 2047-3, VC-2 Level 65 Compression of High Definition Video Sources for use with Standard Definition Infrastructure. VC-2 “Picture Numbers” provide unique identifiers for pictures within a sequence. Picture numbers within a VC-2 sequence are required to increment by one for each successive picture within a given sequence. Between sequences they are unconstrained and so picture numbers, starting from any arbitrary value, may be inserted in a decoded VC-2 stream while retaining compliance with the specificat
