mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-10 11:29:55 +00:00
69 lines
2.3 KiB
Text
69 lines
2.3 KiB
Text
playbin2
|
|
--------
|
|
|
|
The purpose of this element is to decode and render the media contained in a
|
|
given generic uri. The element extends GstPipeline and is typically used in
|
|
playback situations.
|
|
|
|
Required features:
|
|
|
|
- accept and play any valid uri. This includes
|
|
- rendering video/audio
|
|
- overlaying subtitles on the video
|
|
- optionally read external subtitle files
|
|
- allow for hardware (non raw) sinks
|
|
- selection of audio/video/subtitle streams based on language.
|
|
- perform network buffering/incremental download
|
|
- gapless playback
|
|
- support for visualisations with configurable sizes
|
|
- ability to reject files that are too big, or of a format that would require
|
|
too much CPU/memory usage.
|
|
- be very efficient with adding elements such as converters to reduce the
|
|
amount of negotiation that has to happen.
|
|
- handle chained oggs. This includes having support for dynamic pad add and
|
|
remove from a demuxer.
|
|
|
|
Components
|
|
----------
|
|
|
|
* decodebin2
|
|
|
|
- performs the autoplugging of demuxers/decoders
|
|
- emits signals when for steering the autoplugging
|
|
- to decide if a non-raw media format is acceptable as output
|
|
- to sort the possible decoders for a non-raw format
|
|
- see also decodebin2 design doc
|
|
|
|
* uridecodebin
|
|
|
|
- combination of a source to handle the given uri, an optional queueing element
|
|
and one or more decodebin2 elements to decode the non-raw streams.
|
|
|
|
* playsink
|
|
|
|
- handles display of audio/video/text.
|
|
- has request audio/video/text input pad. There is only one sinkpad per type.
|
|
The requested pads define the configuration of the internal pipeline.
|
|
- allows for setting audio/video sinks or does automatic sink selection.
|
|
- allows for configuration of visualisation element.
|
|
- allows for enable/disable of visualisation, audio and video.
|
|
|
|
* playbin2
|
|
|
|
- combination of one or more uridecodebin elements to read the uri and subtitle
|
|
uri.
|
|
- support for queuing new media to support gapless playback.
|
|
- handles stream selection.
|
|
- uses playsink to display.
|
|
- selection of sinks and configuration of uridecodebin with raw output formats.
|
|
|
|
|
|
Gapless playback
|
|
----------------
|
|
|
|
playbin2 has an "about-to-finish" signal. The application should configure a new
|
|
uri (and optional suburi) in the callback. When the current media finishes, this
|
|
new media will be played next.
|
|
|
|
|
|
|