International organisation for standardisation organisation internationale de normalisation

0.9 System reference decoder

Part 1 of ISO/IEC 13818 employs a "System Target Decoder," (STD), one for Transport Streams (refer to 2.4.2 on page 11) referred to as "Transport System Target Decoder"(T-STD) and one for Program Streams (refer to 2.5.2 on page 54) referred to as "Program System Target Decoder"(P STD), to provide a formalism for timing and buffering relationships. Because the STD is parameterized in terms of ITU T Rec. H.222.0†|†ISO/IEC 13818 fields (for example, buffer sizes) each elementary stream leads to its own parameterization of the STD. Encoders shall produce bit streams that meet the appropriate STD's constraints. Physical decoders may assume that a stream plays properly on its STD; the physical decoder must compensate for ways in which its design differs from that of the STD.

0.10 Applications

The streams defined in this document are intended to be as useful as possible to a wide variety of applications. Application developers should select the most appropriate stream.

distributing compressed bit-streams over long distance networks and in broadcast systems.

Section 1: General

1.1 Scope

ITU T Rec. H.222.0†|†ISO/IEC 13818-1 specifies the system layer of the coding. It was developed principally to support the combination of the video and audio coding methods defined in parts 2 and 3 of this Recommendation†|†International Standard. The system layer supports five basic functions: 1) the synchronization of multiple compressed streams on decoding, 2) the interleaving of multiple compressed streams into a single stream, 3) the initialization of buffering for decoding start up, 4) continuous buffer management, and 5) time identification.

1.2 Normative References

The following Recommendations and International standards contain provisions which, through reference in this text, constitute provisions of this Recommendation†|†International Standard. At the time of publication, the editions indicated were valid. All Recommendations and International Standards are subject to revision, and parties to agreements based on this Recommendation†|†International Standard are encouraged to investigate the possibility of applying the most recent editions of the Recommendations and International Standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. The Telecommunications Standardization Bureau of the ITU maintains a list of currently valid ITU T Recommendations.

1.3 Identical Recommendations†|†International Standards

ITU T Rec. H.262†|†ISO/IEC 13818-2:1994 Information technology - Coding of moving pictures and associated audio - Part 2: Video.

1.4 Additional references

ISO 8859-1:1987, Information processing- 8 bit single-byte coded graphic character Sets - Part 1: Latin alphabet No. 1.