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、4g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 61883-4:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 14 March 2006 BSI 14 March 2006ISBN 0 580 47579 4National forewo
3、rdThis 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 It is identical with IEC 61883-4:2004.It supersedes BS EN 61883-4:1998 which will be withdrawn on 1 November 2008.The CENELEC common modifications have been implemented at the appropriate places in the text. The sta
4、rt 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 modifications introduced by CENELEC amendment A11 are indicated by .The UK participation in it
5、s 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 its secretary.Cross-referencesThe British Standards which implement international or Eu
6、ropean 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 Catalogue or of British Standards Online.This publication does not purport to include a
7、ll 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 the text; present to the responsible international/European committee any enquiries
8、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 cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover a
9、nd a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 61883-4NORME EUROPENNE EUROPISCHE NORM November 2005 CENELECEuropean Committee for Electrotechnical Standardiz
10、ation Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Norm ung Central Secretariat: rue de 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
11、 ICS 35.200; 33.160.01 Supersedes EN 61883-4:1998English version Consumer audio/video equipment - Digital interface Part 4: MPEG2-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-Gert
12、e der Unterhaltungselektronik - Digitale Schnittstelle Teil 4: MPEG2-TS-Datenbertragung (IEC 61883-4:2004) This European Standard 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 Europ
13、ean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning 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 (Englis
14、h, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language 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,
15、Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 61883-4:2005 2 Foreword The text of the Int
16、ernational Standard IEC 61883-4:2004, prepared 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 superse
17、des EN 61883-4:1998. It contains the following 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 o
18、f an identical national standard or by endorsem 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 approve
19、d by CENELEC as a European Standard without any m odification. 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 MPEG2 transport streams for the IEEE 1394 dig
20、ital 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 Normative reference The following referenced
21、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 equipment Digital interface Part 1: Gene
22、ral 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, Information technology Generic coding of moving pic
23、tures 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 systems for television, sound and data ser
24、vices 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 Digital Video Broadcasting (in Europe) S
25、I 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 EN 61883-4:2005 4 4 Construction of IEEE 1394 packet 4.1 Struct
26、ure 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 source packet header of 4 bytes. The source packet header contains a time stamp. MPEG2-TS packets shall comply with ISO/IEC 13818
27、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 packed in an IEEE 1394 isochronous packet. A receiver of the isochronous packets shall collect the data blocks of one source pa
28、cket 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 (see 5.2). Active transmitters shall send an isochronous packet in every cycle. If not enough data is available to transmit in
29、 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 reconstructing a correct timing of the TSPs at their output. The time stamp indicates the intended delivery time of the first bit/by
30、te 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 the first bit/byte of the TSP arrives from the application, plus some offset. The offset is equal to the constant overall dela
31、y 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 of CIP header The structure of the CIP header (see Figure 2) for the MPEG2-TS is compliant with the two quadlet CIP header for
32、mat 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 blocks in one source packet) QPC 0002(no padding) SPH 1 (source packet header is present) DBC 0 . 255 (see 5.2) FMT 1000002(fo
33、rmat type of MPEG2-TS) FDF . (see 5.3) 5 EN 61883-4:20055.2 DBC values The first data block 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 o
34、f source packets. Where the isochronous packet contains one data block, then the DBC value 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 so
35、urce packets (n is an integer) then the DBC value is a multiple of 8. The three LSBs are 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.
36、 1 = the stream is time-shifted. Res: reserved for future extension and shall be zeros. 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 o
37、nly one or a few programs have to be transmitted. If a programme selection is carried out, 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
38、a result of the smoothing operation, the TSPs will be shifted in time. The TSPs at the output 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 re
39、quirements on the timing of the TSPs. The jitter introduced by the smoothing buffer and 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 t
40、he digital interface. The receiver of the interface contains a receiver buffer. In this receiver buffer, the jitter introduced is compensated. EN 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 t
41、he 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
42、 packet(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, t
43、hen 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
44、 to 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 alread
45、y been 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
46、the 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. T
47、he 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 i
48、ntroduced 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. 7 EN 61883-4:2005Source packet header (4 bytes)Sync byteTSP (188 bytes)Source packet (192 bytes)Figure 1a Source packet
49、Figure 1 Structure of a source packetReserved (7 bits) cycle count (13 bits)cycle_offset (12 bits)Figure 1b Source packet headerMSB LSBIEC 292/98IEC 293/98Figure 2 CIP header for MPEG2-TSSPHSID DBS DBCFN0 0 ResQPCFDFFMT10SID source node IDDBS data block size in quadletsFN fraction numberQPC quadlet padding countSPH source packet headerRes reservedDBC data block continuity counterFMT format IDFDF format-dependent fieldIEC 294/98ResTSFFigure 3 Structure of FDF areaIEC 2
