BS EN 61883-4-2005 Consumer audio video equipment - Digital interface - Part 4 MPEG2-TS data transmission《用户音频 视频设备 数字接口 第4部分 MPEG2-TS数据传输》.pdf

1、BRITISH STANDARDBS EN 61883-4:2005Consumer audio/video equipment Digital interface Part 4: MPEG2-TS data transmissionThe European Standard EN 61883-4:2005 has the status of a British StandardICS 35.200; 33.160.01g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g4

2、4g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Tue May 16 08:12:43 BST 2006, Uncontrolled Copy, (c) BSIBS EN 61883-4:2005This British Standard was published under the authority of the Standards Policy and S

3、trategy Committee on 14 March 2006 BSI 14 March 2006ISBN 0 580 47579 4National forewordThis British Standard is the official English language version of EN 61883-4:2005. It is identical with IEC 61883-4:2004.It supersedes BS EN 61883-4:1998 which will be withdrawn on 1 November 2008.The CENELEC comm

4、on modifications have been implemented at the appropriate places in the text. The start and finish of each common modification is indicated in the text by tags . Where a common modification has ben introduced by amendment, the tags carry the number of the amendment. For example, the common modificat

5、ions introduced by CENELEC amendment A11 are indicated by .The UK participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems, which has the responsibility to:A list of organizations represented on this committee can be obtained on request to it

6、s secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogueunder the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Ca

7、talogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand

8、 the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front c

9、over, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Tue May 16 08:12:

10、43 BST 2006, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 61883-4NORME EUROPENNE EUROPISCHE NORM November 2005 CENELECEuropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Norm ung Central Secretariat: rue d

11、e Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61883-4:2005 E ICS 35.200; 33.160.01 Supersedes EN 61883-4:1998English version Consumer audio/video equipment - Digital interface Part 4: MPEG2-

12、TS data transm ission (IEC 61883-4:2004)Matriel audio/vido grand public - Interface numrique Partie 4: Transmission de donnes MPEG2-TS (CEI 61883-4:2004) Audio/Video-Gerte der Unterhaltungselektronik - Digitale Schnittstelle Teil 4: MPEG2-TS-Datenbertragung (IEC 61883-4:2004) This European Standard

13、was approved by CENELEC on 2005-11-01. CENELEC members are bound to com ply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning

14、such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in two official versions (English, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language

15、 and notified to the Central Secretariat has the sam e status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, L

16、uxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Tue May 16 08:12:43 BST 2006, Uncontrolled Copy, (c) BSIEN 61883-4:2005 2 Foreword The text of the International Standard IEC 61883-4:2004, prepare

17、d by technical area 4, Digital system interfaces and protocols, of IEC TC 100, Audio, video and m ultim edia system s and equipm ent, was subm itted to the formal vote and was approved by CENELEC as EN 61883-4 on 2005-11-01. This European Standard supersedes EN 61883-4:1998. It contains the followin

18、g significant technical changes with respect to EN 61883-4:1998: updated IEC 61834-9, IEC 61834-10 and added IEC 61834-1 in Bibliography. The following dates were fixed: latest date by which the EN has to be implem ented at national level by publication of an identical national standard or by endors

19、em ent (dop) 2006-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2008-11-01 Annex ZA has been added by CENELEC. _ Endorsem ent notice The text of the International Standard IEC 61883-4:2004 was approved by CENELEC as a European Standard without a

20、ny m odification. Licensed Copy: Wang Bin, na, Tue May 16 08:12:43 BST 2006, Uncontrolled Copy, (c) BSI 3 EN 61883-4:2005CONSUMER AUDIO/VIDEO EQUIPMENT DIGITAL INTERFACE Part 4: MPEG2-TS data transmission 1 Scope This part of IEC 61883 describes the packetization and the transmission timing for MPEG

21、2 transport streams for the IEEE 1394 digital interface. It describes the specifications for the IEEE 1394 packet, the CIP header and the transmission timing for use with the transport stream as specified in prETS 300 468. This explanation is based on the transport stream as specified in DVB. 2 Norm

22、ative reference The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61883-1, Consumer audio/video

23、 equipment Digital interface Part 1: General ISO/IEC 13818-1, Information technology Generic coding of moving pictures and associated audio information: SystemsISO/IEC 13818-2, Information technology Generic coding of moving pictures and associated audio information: VideoISO/IEC 13818-3, Informatio

24、n technology Generic coding of moving pictures and associated audio information Part 3: Audio ISO/IEC 13818-9, Information technology Generic coding of moving pictures and associated audio information Part 9: Extension for real time interface for system decoders prETS 300 468, Digital broadcasting s

25、ystems for television, sound and data services Specification for Service Information (SI) in digital video broadcasting (DVB) systems3 Terms, definitions, and abbreviations For the purposes of this document, the following abbreviations apply: CIP Common Isochronous Packet CTR Cycle Time Register DVB

26、 Digital Video Broadcasting (in Europe) SI Service Information ETS European Telecommunication Standard MPEG Moving Picture Experts Group RTI Real Time Interface TS Transport Stream TSP Transport Stream Packet IEEE 1394 packet IEEE 1394 isochronous packet defined in IEC 61883-1 Licensed Copy: Wang Bi

27、n, na, Tue May 16 08:12:43 BST 2006, Uncontrolled Copy, (c) BSIEN 61883-4:2005 4 4 Construction of IEEE 1394 packet 4.1 Structure of the MPEG2-TS data stream The length of the source packet is 192 bytes (see Figure 1). The source packet consists of one MPEG2-TSP with a length of 188 bytes and a sour

28、ce packet header of 4 bytes. The source packet header contains a time stamp. MPEG2-TS packets shall comply with ISO/IEC 13818 series. 4.2 Packetization of source packet of the MPEG2-TS data stream A source packet is split into 8 data blocks with a length of 6 quadlets. Zero or more data blocks are p

29、acked in an IEEE 1394 isochronous packet. A receiver of the isochronous packets shall collect the data blocks of one source packet and combine them in order to reconstruct the source packet before sending this source packet to the application. There are restrictions on the transmission of fractions

30、(see 5.2). Active transmitters shall send an isochronous packet in every cycle. If not enough data is available to transmit in the isochronous packet, then an empty packet shall be transmitted. 4.3 Time stamp The time stamp in the source packet header is used by isochronous data receivers for recons

31、tructing a correct timing of the TSPs at their output. The time stamp indicates the intended delivery time of the first bit/byte of the TSP from the receiver output to the transport stream target decoder. The time stamp represents the 25 bits of the IEEE 1394 CYCLE_TIME register (CTR) at the moment

32、the first bit/byte of the TSP arrives from the application, plus some offset. The offset is equal to the constant overall delay of the TSP between the moment of arriving (of the first bit) and the moment the TSP (first bit) is delivered by the receiver to the application. 5 CIP header 5.1 Structure

33、of CIP header The structure of the CIP header (see Figure 2) for the MPEG2-TS is compliant with the two quadlet CIP header format explained in IEC 61883-1, 6.2.1. The static values of the CIP header components are as follows. SID . (depends on configuration) DBS 000001102(6 quadlets) FN 112 (8 data

34、blocks in one source packet) QPC 0002(no padding) SPH 1 (source packet header is present) DBC 0 . 255 (see 5.2) FMT 1000002(format type of MPEG2-TS) FDF . (see 5.3) Licensed Copy: Wang Bin, na, Tue May 16 08:12:43 BST 2006, Uncontrolled Copy, (c) BSI 5 EN 61883-4:20055.2 DBC values The first data bl

35、ock of a source packet (data block containing the source packet header) corresponds to a DBC value from which the three LSBs are 000. An isochronous packet contains 0, 1, 2 or 4 data blocks or an integer number of source packets. Where the isochronous packet contains one data block, then the DBC val

36、ue increments with 1; two data blocks, then the DBC value is a multiple of 2, the LSB is 0; four data blocks, then the DBC value is a multiple of 4, the two LSBs are 00. Where the isochronous packet contains n source packets (n is an integer) then the DBC value is a multiple of 8. The three LSBs are

37、 000. 5.3 FDF area The structure of the FDF area is shown in Figure 3. The definitions of the fields are as follows: TSF (time shift flag) indicates a time-shifted data stream: 0 = the stream is not time-shifted. 1 = the stream is time-shifted. Res: reserved for future extension and shall be zeros.

38、6 Transmission of isochronous packets 6.1 Steps in transmission An MPEG2-TS consists of TSPs with a length of 188 bytes. In Figure 4, an example is given of a TS which consists of several programmes. Very often only one or a few programs have to be transmitted. If a programme selection is carried ou

39、t, then only those TSPs from that particular TS are transmitted. In this situation, the occupied bandwidth on the 1394 interface can be reduced. Reduction of the bit rate is carried out in a smoothing buffer. As a result of the smoothing operation, the TSPs will be shifted in time. The TSPs at the o

40、utput of the smoothing buffer are transmitted over the interface. During transmission this interface will introduce some jitter on the arrival time of the TSPs in the receiver. In the MPEG2-TS there are strong requirements on the timing of the TSPs. The jitter introduced by the smoothing buffer and

41、the transmitter of the interface shall be compensated. To do this, a time stamp is added to the TSP at the moment it arrives at the input of the smoothing buffer or, if smoothing is not applied, at the input of the digital interface. The receiver of the interface contains a receiver buffer. In this

42、receiver buffer, the jitter introduced is compensated. Licensed Copy: Wang Bin, na, Tue May 16 08:12:43 BST 2006, Uncontrolled Copy, (c) BSIEN 61883-4:2005 6 6.2 Late packets The time stamp in the transmitted source packet header shall point to a value in future. If for some reason the delay in the

43、transmitter is too long, resulting in a time stamp which points in the past (late packet), then this source packet is not transmitted. A late packet occurs if the actual value of the CTR becomes equal to the value represented in the time stamp from the source packet header, before the isochronous pa

44、cket(s) that contain the source packet (including CRC), has been transmitted. In the case of transmission of one source packet/cycle, the interval needed to transmit the complete isochronous packet can be calculated (the clock frequency and the number of bits is known). If a late packet occurs, then

45、 an empty packet or the next valid packet should be sent and the late packet is discarded. In the case of transmission of more than one source packet /cycle, then the same procedure is followed. It is allowed to discard all source packets from the isochronous packet if one source packet turns out to

46、 be a late packet. In the case of transmission of fractions, it is recommended to first collect a complete source packet in the transmitter. If a late packet occurs, then the complete source packet should be discarded. If a late packet occurs when some data blocks of the source packet have already b

47、een transmitted (for example, at a bus reset), then data blocks remaining in the transmitting buffer are removed. 7 Buffering in the receiver Buffering in the receiver is needed to compensate jitter introduced by smoothing buffer and transmitter. It is expected that, at the moment of arriving in the

48、 receiver, the source packets or fractions of source packets are stored in the receiving buffer with the bus clock frequency (S100, S200 or S400 mode). The MPEG2 TSPs are read out of the receiver buffer and sent to the application at the intended delivery time of the first bit(byte) of the TSP. The

49、intended delivery time is represented by the time stamp in the source packet header. The clock frequency used for reading the bytes from the TSP may be high. Buffering needed for compensating jitter from the transmitter only is given in Table A.1 and buffering needed for compensating the jitter introduced by smoothing of the TS is given in Table A.2. For the transmission of an MPEG2-TS as specified in DVB, it is expected that the buffer size in the receiver is 3 264 bytes. Licensed Copy: