1、 Recommendation ITU-R BT.1618-1(03/2011)Data structure for DV-based audio, data and compressed video at data ratesof 25 and 50 Mbit/sBT SeriesBroadcasting service(television)ii Rec. ITU-R BT.1618-1 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and
2、 economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are perform
3、ed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to
4、be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be foun
5、d. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radi
6、odetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management S
7、NG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2011 ITU 2011 All rights reserved. No part of thi
8、s publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BT.1618-1 1 RECOMMENDATION ITU-R BT.1618-1 Data structure for DV-based audio, data and compressed video at data rates of 25 and 50 Mbit/s (Question ITU-R 12/6) (2003-2011) Scope This Recommendatio
9、n defines the DV-based data structure for the interface of digital audio, sub-code data and compressed video with the following parameters: 525/60 system 4:1:1 image sampling structure, 25 Mbit/s data rate 525/60 system 4:2:2 image sampling structure, 50 Mbit/s data rate 625/50 system 4:1:1 image sa
10、mpling structure, 25 Mbit/s data rate 625/50 system 4:2:2 image sampling structure, 50 Mbit/s data rate. The ITU Radiocommunication Assembly, considering a) that applications within professional television production and post-production have been identified where DV-based video compression can offer
11、 operational and economic advantages; b) that three data rates have been proposed within the same compression family to serve different applications (25 Mbit/s, 50 Mbit/s and 100 Mbit/s); c) that the sampling rasters for each of the three applications are different; d) that audio, auxiliary data and
12、 metadata elements form an integral part of these applications; e) that these elements are multiplexed into a single data stream for transport and further processing; f) that the compression quality and functional characteristics must be identical and reproducible in complex production chains; g) th
13、at for this purpose all details of parameters used for coding and multiplexing must be defined, recommends 1 that for applications in professional television production and post-production using DV-based compression at 25 and 50 Mbit/s, the parameters given in Annex 1 shall be used; 2 that complianc
14、e with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall” or some other obliga
15、tory language such as “must” and the negative equivalents are used to express requirements. The use of such words shall in no way be construed to imply partial or total compliance with this Recommendation. 2 Rec. ITU-R BT.1618-1 Annex 1 1 Interface 1.1 Introduction As shown in Fig. 1, processed audi
16、o, video, and subcode data are output for different applications through a digital interface port. 1.2 Data structure The data structure of the compressed stream at the digital interface is shown in Figs 2 and 3. Figure 2 shows the data structure for a 50 Mb/s structure, and Fig. 3 shows the data st
17、ructure for a 25 Mb/s structure. In the 50 Mb/s structure, the data of one video frame are divided into two channels. Each channel is divided into 10 DIF sequences for the 525/60 system and 12 DIF sequences for the 625/50 system. In the 25 Mb/s structure, the data of one video frame are divided into
18、 10 DIF sequences for the 525/60 system and 12 DIF sequences for the 625/50 system. Each DIF sequence consists of a header section, subcode section, VAUX section, audio section, and video section with the following DIF blocks respectively: Header section: 1 DIF block Subcode section: 2 DIF blocks VA
19、UX section: 3 DIF blocks Audio section: 9 DIF blocks Video section: 135 DIF blocks. As shown in Figs 2 and 3, each DIF block consists of a 3-byte ID and 77 bytes of data. DIF data bytes are numbered 0 to 79. Figure 4 shows the data structure of a DIF sequence for a 50 or 25 Mb/s structure. FIGURE 1
20、Block diagram on digital interface BT.1618-01Audio, video andsubcodeDigitalinterfaceDigital interfaceSubcode in Video in Audio in Rec. ITU-R BT.1618-1 3 FIGURE 2 Data structure of one video frame for 50 Mb/s structure BT.1618-02- -DIF sequence 1,0Second channelDIF sequence n-1,0DIF sequence 0,0 DIF
21、sequence 1,1 DIF sequence n-1, 1DIF sequence 0,1Subcode sectionHeader section Audio and video sectionVAUX sectionDataIDByte position number0 1 2 3 79Structure of a DIFsequenceDIF blocksStructure of a DIF blockDIF sequencesDIF block number FSCDIF sequence number FSCData in one video frameFirst channe
22、lH0,0 SC0,0 SC1,0 VA1,0 VA2,0 A0,0VA0,0 V0,0 V134,0V133,0V132,0Wheren = 10 for 525/60 systemn = 12 for 625/50 systemFSC : First/second channelFIGURE 3 Data structure of one video frame for 25 Mb/s structure BT.1618-03-DIF sequence 1,0Data in one video frameDIF sequence n-1,0DIF sequence 0,0Subcode s
23、ectionHeader section Audio and video sectionVAUX sectionDataIDByte position number0 1 2 3 79Structure of a DIFsequenceDIF blocksStructure of a DIF blockDIF sequencesDIF block number FSCDIF sequence number FSCH0,0 SC0,0 SC1,0 VA1,0 VA2,0 A0,0VA0,0 V0,0 V134,0V133,0V132,0Wheren = 10 for 525/60 systemn
24、 = 12 for 625/50 systemFSC : First/second channel4 Rec. ITU-R BT.1618-1 FIGURE 4 Data structure of a DIF sequence BT.1618-04H0,i SC0,i SC1,i VA0,i VA1,i VA2,iDIF blocksA0,i V0,i V1,i V2,i V3,i V4,i V5,iA1,i V15,i V16,i V17,i V18,i V19,i V20,i V21,iV6,iA2,i V30,i V31,i V32,i V33,i V34,i V35,i V36,iA3
25、,i V45,i V46,i V47,i V48,i V49,i V50,i V51,iA4,i V60,i V61,i V62,i V63,i V64,i V65,i V66,iA5,i V75,i V76,i V77,i V78,i V79,i V80,i V81,iA6,i V90,i V91,i V92,i V93,i V94,i V95,i V96,iA7,i V105,i V106,i V107,i V108,i V109,i V110,i V111,iA8,i V120,i V121,i V122,i V123,i V124,i V125,i V126,iV7,i V8,i V9
26、,i V10,i V11,i V12,i V13,i V14,iV22,i V23,i V24,i V25,i V26,i V27,i V28,i V29,iV37,i V38,i V39,i V40,i V41,i V42,i V43,i V44,iV52,i V53,i V54,i V55,i V56,i V57,i V58,i V59,iV67,i V68,i V69,i V70,i V71,i V72,i V73,i V74,iV82,i V83,i V84,i V85,i V86,i V87,i V88,i V89,iV97,i V98,i V99,i V100,i V101,i V
27、102,i V103,i V104,iV112,i V113,i V114,i V115,i V116,i V117,i V118,i V119,iV127,i V128,i V129,I V130,i V131,i V132,i V133,i V134,iDIF block numberwhere: i: FSC i = 0 for 25 Mb/s structure i = 0,1 for 50 Mb/s structure H0,i: DIF block in header section SC0,i to SC1,i: DIF blocks in subcode section VA0
28、,i to VA2,i: DIF blocks in VAUX section A0,i to A8,i: DIF blocks in audio section V0,i to V134,i: DIF blocks in video section. Rec. ITU-R BT.1618-1 5 1.3 Header section 1.3.1 ID The ID part of each DIF block in the header section, shown in Figs 2 and 3, consists of 3 bytes (ID0, ID1, ID2). Table 1 s
29、hows the ID content of a DIF block. TABLE 1 ID data of a DIF block Byte position number Byte 0 (ID0) Byte 1 (ID1) Byte 2 (ID2) MSB SCT2Dseq3DBN7SCT1Dseq2DBN6SCT0Dseq1DBN5Res Dseq0DBN4Arb FSC DBN3Arb Res DBN2Arb Res DBN1LSB Arb Res DBN0ID contains the following: SCT: Section type (see Table 2) Dseq:
30、DIF sequence number (see Tables 3 and 4) FSC: Identification of a DIF block in each channel 50 Mb/s structure FSC = 0: first channel FSC = 1: second channel 25 Mb/s structure FSC = 0 DBN: DIF block number (see Table 5) Arb: Arbitrary bit Res: Reserved bit for future use Default value shall be set to
31、 1. 6 Rec. ITU-R BT.1618-1 TABLE 2 Section type SCT2SCT1SCT0Section type 0 0 0 Header 0 0 1 Subcode 0 1 0 VAUX 0 1 1 Audio 1 0 0 Audio 1 0 1 Reserved 1 1 0 1 1 1 TABLE 3 DIF sequence number for 525/60 system Dseq3Dseq2Dseq1Dseq0Meaning 0 0 0 0 DIF sequence number 0 0 0 0 1 DIF sequence number 1 0 0
32、1 0 DIF sequence number 2 0 0 1 1 DIF sequence number 3 0 1 0 0 DIF sequence number 4 0 1 0 1 DIF sequence number 5 0 1 1 0 DIF sequence number 6 0 1 1 1 DIF sequence number 7 1 0 0 0 DIF sequence number 8 1 0 0 1 DIF sequence number 9 1 0 1 0 Not used 1 0 1 1 Not used 1 1 0 0 Not used 1 1 0 1 Not u
33、sed 1 1 1 0 Not used 1 1 1 1 Not used Rec. ITU-R BT.1618-1 7 TABLE 4 DIF sequence number for 625/50 system Dseq3Dseq2Dseq1Dseq0Meaning 0 0 0 0 DIF sequence number 0 0 0 0 1 DIF sequence number 1 0 0 1 0 DIF sequence number 2 0 0 1 1 DIF sequence number 3 0 1 0 0 DIF sequence number 4 0 1 0 1 DIF seq
34、uence number 5 0 1 1 0 DIF sequence number 6 0 1 1 1 DIF sequence number 7 1 0 0 0 DIF sequence number 8 1 0 0 1 DIF sequence number 9 1 0 1 0 DIF sequence number 10 1 0 1 1 DIF sequence number 11 1 1 0 0 Not used 1 1 0 1 Not used 1 1 1 0 Not used 1 1 1 1 Not used TABLE 5 DIF block number Dseq7Dseq6
35、Dseq5Dseq4Dseq3Dseq2Dseq1Dseq0Meaning 0 0 0 0 0 0 0 0 DIF sequence number 0 0 0 0 0 0 0 0 1 DIF sequence number 1 0 0 0 0 0 0 1 0 DIF sequence number 2 0 0 0 0 0 0 1 1 DIF sequence number 3 : : : : : : : : : : : : : : : : : : : : : : : : : : : 1 0 0 0 0 1 1 0 DIF block number 134 1 0 0 0 0 1 1 1 Not
36、 used : : : : : : : : : 1 1 1 1 1 1 1 1 Not used 1.3.2 Data The data part (payload) of each DIF block in the header section is shown in Table 6. Bytes 3 to 7 are active and bytes 8 to 79 are reserved. 8 Rec. ITU-R BT.1618-1 TABLE 6 Data (payload) in the header DIF block Byte position number of heade
37、r DIF block 3 4 5 6 7 8 79 MSB DSF Res TF1 TF2 TF3 Res Res Res 0 Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res Res APT2 AP12 AP22 AP32 Res Res Res Res APT1 AP11 AP21 AP31 Res Res Res LSB Res APT0 AP10 AP20 AP30 Res Res Res
38、 DSF: DIF sequence flag DSF = 0: 10 DIF sequences included in a channel (525/60 system) DSF = 1: 12 DIF sequences included in a channel (625/50 system) APTn, AP1n, AP2n, AP3n: These data shall be identical as track application IDs (APTn = 001, AP1n = 001, AP2n = 001, AP3n = 001), if the source signa
39、l comes from a digital VCR. If the signal source is unknown, all bits for these data shall be set to 1. TF: Transmitting flag: TF1: Transmitting flag of audio DIF blocks TF2: Transmitting flag of VAUX and video DIF blocks TF3: Transmitting flag of subcode DIF blocks TFn = 0: Data shall be valid TFn
40、= 1: Data shall be invalid Res: Reserved bit for future use Default value shall be set to 1. 1.4 Subcode section 1.4.1 ID The ID part of each DIF block in the subcode section is described in 1.3.1. The section type shall be 001. 1.4.2 Data The data part (payload) of each DIF block in the subcode sec
41、tion is shown in Fig. 5. The subcode data consists of 6 SSYBs, each 8 bytes long, and a reserved area of 29 bytes in each relevant DIF block. SSYBs in a DIF sequence are numbered 0 to 11. Each SSYB is composed of SSYB ID equal to 2 bytes, FFh, and an SSYB data payload of 5 bytes. Rec. ITU-R BT.1618-
42、1 9 FIGURE 5 Data in the subcode section BT.1618-05SC1,0SC1,1Byte position numberID Reserved29 bytesData0 1 2 3 50 51793 10 11 18 19 26 27 34 35 42 43 50SSYB6 SSYB7 SSYB8 SSYB9 SSYB10 SSYB118 bytesSSYBID0SSYBID1FFh SSYB dataByte position numberIDSC0,0SC0,129 bytesData0 1 2 3 50 51 793 10 11 18 19 26
43、 27 34 35 42 43 50SSYB0 SSYB1 SSYB2 SSYB4 SSYB5SSYB3Reserved1.4.2.1 SSYB ID Table 7 shows SSYB ID (ID0, ID1). These data contain FR ID, application ID (AP32, AP31, AP30), and SSYB number ( Syb3, Syb2Syb1, Syb0). FR ID is an identification for the first or second half of each channel: FR = 1: the fir
44、st half of each channel FR = 0: the second half of each channel The first half of each channel DIF sequence number 0, 1, 2, 3, 4 for the 525/60 system DIF sequence number 0, 1, 2, 3, 4, 5 for the 625/50 system The second half of each channel DIF sequence number 5, 6, 7, 8, 9 for the 525/60 system DI
45、F sequence number 6, 7, 8, 9. 1 0, 11 for the 625/50 system If information is not available, all bits shall be set to 1. 10 Rec. ITU-R BT.1618-1 TABLE 7 SSYB ID Bit position SSYB number 0 and 6 SSYB number 1 to 5 and 7 to 10 SSYB number 11 ID0 ID1 ID0 ID1 ID0 ID1 b7 (MSB) FR Arb FR Arb FR Arb b6 AP3
46、2Arb Res Arb APT2Arb b5 AP31Arb Res Arb APT1Arb b4 AP30Arb Res Arb APT0Arb b3 Arb Syb3Arb Syb3Arb Syb3b2 Arb Syb2Arb Syb2Arb Syb2b1 Arb Syb1Arb Syb1Arb Syb1b0 (LSB) Arb Syb0Arb Syb0Arb Syb0NOTE 1 Arb = arbitrary bit. 1.4.2.2 SSYB data Each SSYB data payload consists of a pack of 5 bytes as shown in
47、Fig. 6. Table 8 shows pack header table (PCO byte organization). Table 9 shows the pack arrangement in SSYB data for each channel. FIGURE 6 Pack in SSYB BT.1618-06SSYB data5 bytesPC0SSYB ID0SSYB ID1 FFhPackPC1 PC2 PC3 PC4Rec. ITU-R BT.1618-1 11 TABLE 8 Pack header table UPPER LOWER 0000 0001 0010 00
48、11 0100 0101 0110 0111 1111 0000 SOURCE SOURCE 0001 SOURCE CONTROL SOURCE CONTROL 0010 0011 TIME CODE 0100 BINARY GROUP 0101 | 1111 NO INFO TABLE 9 Mapping of packet in SSYB data SSYB number First half of each channel Second half of each channel 0 Reserved Reserved 1 Reserved Reserved2 Reserved Rese
49、rved 3 TC TC 4 BG Reserved5 TC Reserved 6 Reserved Reserved7 Reserved Reserved 8 Reserved Reserved9 TC TC 10 BG Reserved 11 TC ReservedNOTE 1 TC = time code pack. NOTE 2 BG = binary group pack. NOTE 3 Reserved = default value of all bits shall be set to 1. NOTE 4 TC and BG data are the same within a single video frame. The time code data are an LCT type. 12 Rec. ITU-R BT.1618-1 1.4.2.2.1 Time code pack Table 10 shows a mapping of the time code (TC) pack. Time code data ma
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