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104 lines
4.3 KiB
Markdown
104 lines
4.3 KiB
Markdown
# MPEG-TS helper library
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This library should be linked to by getting cflags and libs from
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gstreamer-plugins-bad-{{ gst_api_version.md }}.pc and adding
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-lgstmpegts-{{ gst_api_version.md }} to the library flags.
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> NOTE: This library API is considered *unstable*
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## Purpose
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The MPEG-TS helper library provides a collection of definitions, object,
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enumerations and functions to assist with dealing with the base *MPEG 2
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Transport Stream* (MPEG-TS) format (as defined by `ISO/IEC 13818-1` and `ITU-T
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H.222.0`) and its derivates (`DVB`, `ATSC`, `SCTE`, `ARIB`, `Blu-ray`, `AVCHD`,
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...).
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This library provides helpers for dealing with:
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* The various Section Information (SI) and Program-Specific Information (SI),
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handled with the [GstMpegtsSection](GstMpegtsSection) object and related
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functions.
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* The various descriptors present in SI/PSI, handled with the
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[GstMpegtsDescriptor](GstMpegtsDescriptor) object and related functions.
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This library does not cover:
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* Parsing MPEG-TS packets (PSI or PES) and extracting the sections. One can use
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an existing demuxer/parser element for this, or parse the packets
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themselves.
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* Generate and multiplex MPEG-TS packets and sections. One can use an existing
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muxer element for this.
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Applications, or external elements, can interact with the existing MPEG-TS
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elements via [messages](gst_message_new_mpegts_section) (to receive sections) or
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[events](gst_mpegts_section_send_event) (to send sections).
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## Specification and References
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As much as possible, the information contained in this library is based on the
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official Specification and/or References listed below:
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### `MPEG-TS`
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This is the base specification from which all variants are derived. It covers
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the basic sections (for program signalling) and descriptors. All variants must
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abide by this specification.
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* `ISO/IEC 13818-1` and `ITU-T H.222.0`: *"Information technology – Generic
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coding of moving pictures and associated audio information: Systems"*. The two
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specifications are identical, the ITU one is more easily available (*nudge*).
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### `SMPTE-RA` : *SMPTE Registration Authority*
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The official registration authority for MPEG-TS. This is used for the base
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[Registration Descriptor](gst_mpegts_descriptor_parse_registration) which
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allows to unambiguously identify a stream when it is not specified in a standard
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(yet).
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* <http://smpte-ra.org/>
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### `DVB` : *Digital Video Broadcasting*
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This standards body covers the variant of MPEG-TS used in Europe, Oceania, and
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most of Asia and Africa. The standards are actually published by the `ETSI`
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(European Telecommunications Standards Institute).
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* `ETSI EN 300 468`: *"Digital Video Broadcasting (DVB); Specification for
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Service Information (SI) in DVB systems"*. Covers all the sections and
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descriptors used in DVB variants.
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* `ETSI EN 101 154`: *"Digital Video Broadcasting (DVB);Specification for the
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use of Video and Audio Coding in Broadcast and Broadband
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Applications"*. Provides more details about signalling/sectios for audio/video
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codecs.
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### `ATSC` : *Advanced Television Systems Committee*
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This set of standards covers the variants of MPEG-TS used in North America.
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* `ATSC A/53-3` : *"ATSC Digital Television Standard, Part 3 – Service Multiplex
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and Transport Subsystem Characteristics"*. How ATSC extends the base MPEG-TS.
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* `ATSC A/65` : *"ATSC Standard:Program and System Information Protocol for
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Terrestrial Broadcast and Cable"*. Covers all sections and descriptors used in
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ATSC 1.0 variants.
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* `ATSC A/90` : *"ATSC Data Broadcast Standard"*. Extensions for data transfer
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(i.e. DSM-CC).
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* `ATSC A/107` : *"ATSC 2.0 Standard"*. Adds a few more descriptors.
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* `ATSC Code Points Registry` : The list of stream types, decriptor types,
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etc... used by ATSC standards.
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### `SCTE` : *Society of Cable Telecommunications Engineers*
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This set of standards evolved in parallel with ATSC in North-America. Most of it
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has been merged into ATSC and other standards since.
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* `ANSI/SCTE 35` : *"Digital Program Insertion Cueing Message for Cable"*
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### `DSM-CC` : "Digital Storage Media - Command & Control"
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This ISO standard is the base for asynchronously carrying "files" over mpeg-ts.
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* `ISO/IEC 13818-6` : *"Information technology — Generic coding of moving
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pictures and associated audio information — Part 6: Extensions for DSM-CC"*.
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