mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-22 08:17:01 +00:00
104 lines
4.3 KiB
Markdown
104 lines
4.3 KiB
Markdown
# MPEG-TS helper library
|
||
|
||
This library should be linked to by getting cflags and libs from
|
||
gstreamer-plugins-bad-{{ gst_api_version.md }}.pc and adding
|
||
-lgstmpegts-{{ gst_api_version.md }} to the library flags.
|
||
|
||
> NOTE: This library API is considered *unstable*
|
||
|
||
## Purpose
|
||
|
||
The MPEG-TS helper library provides a collection of definitions, object,
|
||
enumerations and functions to assist with dealing with the base *MPEG 2
|
||
Transport Stream* (MPEG-TS) format (as defined by `ISO/IEC 13818-1` and `ITU-T
|
||
H.222.0`) and its derivates (`DVB`, `ATSC`, `SCTE`, `ARIB`, `Blu-ray`, `AVCHD`,
|
||
...).
|
||
|
||
|
||
This library provides helpers for dealing with:
|
||
|
||
* The various Section Information (SI) and Program-Specific Information (SI),
|
||
handled with the [GstMpegtsSection](GstMpegtsSection) object and related
|
||
functions.
|
||
|
||
* The various descriptors present in SI/PSI, handled with the
|
||
[GstMpegtsDescriptor](GstMpegtsDescriptor) object and related functions.
|
||
|
||
|
||
This library does not cover:
|
||
|
||
* Parsing MPEG-TS packets (PSI or PES) and extracting the sections. One can use
|
||
an existing demuxer/parser element for this, or parse the packets
|
||
themselves.
|
||
|
||
* Generate and multiplex MPEG-TS packets and sections. One can use an existing
|
||
muxer element for this.
|
||
|
||
Applications, or external elements, can interact with the existing MPEG-TS
|
||
elements via [messages](gst_message_new_mpegts_section) (to receive sections) or
|
||
[events](gst_mpegts_section_send_event) (to send sections).
|
||
|
||
## Specification and References
|
||
|
||
As much as possible, the information contained in this library is based on the
|
||
official Specification and/or References listed below:
|
||
|
||
### `MPEG-TS`
|
||
|
||
This is the base specification from which all variants are derived. It covers
|
||
the basic sections (for program signalling) and descriptors. All variants must
|
||
abide by this specification.
|
||
|
||
* `ISO/IEC 13818-1` and `ITU-T H.222.0`: *"Information technology – Generic
|
||
coding of moving pictures and associated audio information: Systems"*. The two
|
||
specifications are identical, the ITU one is more easily available (*nudge*).
|
||
|
||
### `SMPTE-RA` : *SMPTE Registration Authority*
|
||
The official registration authority for MPEG-TS. This is used for the base
|
||
[Registration Descriptor](gst_mpegts_descriptor_parse_registration) which
|
||
allows to unambiguously identify a stream when it is not specified in a standard
|
||
(yet).
|
||
|
||
* <http://smpte-ra.org/>
|
||
|
||
### `DVB` : *Digital Video Broadcasting*
|
||
|
||
This standards body covers the variant of MPEG-TS used in Europe, Oceania, and
|
||
most of Asia and Africa. The standards are actually published by the `ETSI`
|
||
(European Telecommunications Standards Institute).
|
||
|
||
* `ETSI EN 300 468`: *"Digital Video Broadcasting (DVB); Specification for
|
||
Service Information (SI) in DVB systems"*. Covers all the sections and
|
||
descriptors used in DVB variants.
|
||
* `ETSI EN 101 154`: *"Digital Video Broadcasting (DVB);Specification for the
|
||
use of Video and Audio Coding in Broadcast and Broadband
|
||
Applications"*. Provides more details about signalling/sectios for audio/video
|
||
codecs.
|
||
|
||
### `ATSC` : *Advanced Television Systems Committee*
|
||
|
||
This set of standards covers the variants of MPEG-TS used in North America.
|
||
* `ATSC A/53-3` : *"ATSC Digital Television Standard, Part 3 – Service Multiplex
|
||
and Transport Subsystem Characteristics"*. How ATSC extends the base MPEG-TS.
|
||
* `ATSC A/65` : *"ATSC Standard:Program and System Information Protocol for
|
||
Terrestrial Broadcast and Cable"*. Covers all sections and descriptors used in
|
||
ATSC 1.0 variants.
|
||
* `ATSC A/90` : *"ATSC Data Broadcast Standard"*. Extensions for data transfer
|
||
(i.e. DSM-CC).
|
||
* `ATSC A/107` : *"ATSC 2.0 Standard"*. Adds a few more descriptors.
|
||
* `ATSC Code Points Registry` : The list of stream types, decriptor types,
|
||
etc... used by ATSC standards.
|
||
|
||
### `SCTE` : *Society of Cable Telecommunications Engineers*
|
||
|
||
This set of standards evolved in parallel with ATSC in North-America. Most of it
|
||
has been merged into ATSC and other standards since.
|
||
|
||
* `ANSI/SCTE 35` : *"Digital Program Insertion Cueing Message for Cable"*
|
||
|
||
### `DSM-CC` : "Digital Storage Media - Command & Control"
|
||
|
||
This ISO standard is the base for asynchronously carrying "files" over mpeg-ts.
|
||
|
||
* `ISO/IEC 13818-6` : *"Information technology — Generic coding of moving
|
||
pictures and associated audio information — Part 6: Extensions for DSM-CC"*.
|