We want to enable passthrough internally, and only notify that
internally it has been enabled once the transcriber has been unlinked.
This way applications connected to the notify handler can synchronously
update the properties and attempt to disable passthrough again.
Doing so properly requires a refactoring of the transition to the
passthrough state, with the currently set passthrough mode maintained
separately from the target passthrough state.
This commit also finishes the work left incomplete in
17d7997137 by moving the passthrough
property to the sink pad class, making each transcriber passthrough
state independent from the others.
Also adds an example to demonstrate the behavior
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1856>
As part of https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1546
the element started implementing the GstChildProxy interface in order to
expose properties on its sink pads, but the implementation was
incorrect and broke proxying to children elements.
In addition, an intermediary bin was introduced with no name, making it
hard to set the properties of the inner elements through the child
proxy interface, it is now named according to the name of the pad it
corresponds to.
Finally, the default transcriber is back to being named "transcriber".
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1642>
* Update "translation-languages" property to include G_PARAM_CONSTRUCT
so that it can be applied to initial state.
* Change default "translation-languages" value to be None instead of
cea608 specific one. Transcriberbin will be able to configure initia
state depending on selected mux method if "translation-languages" is
unspecified.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1589>
In some situations, a translated alternate audio stream for a content
might be available.
Instead of going through transcription and translation of the original
audio stream, it may be preferrable for accuracy purposes to simply
transcribe the secondary audio stream.
This MR adds support for doing just that:
* Secondary audio sink pads can be requested as "sink_audio_%u"
* Sometimes audio source pads are added at that point to pass through
the audio, as "src_audio_%u"
* The main transcription bin now contains per-input stream transcription
bins. Those can be individually controlled through properties on the
sink pads, for instance translation-languages can be dynamically set
per audio stream
* Some properties that originally existed on the main element still
remain, but are now simply mapped to the always audio sink pad
* Releasing of secondary sink pads is nominally implemented, but not
tested in states other than NULL
An example launch line for this would be:
```
$ gst-launch-1.0 transcriberbin name=transcriberbin latency=8000 accumulate-time=0 \
cc-caps="closedcaption/x-cea-708, format=cc_data" sink_audio_0::language-code="es-US" \
sink_audio_0::translation-languages="languages, transcript=cc3"
uridecodebin uri=file:///home/meh/Music/chaplin.mkv name=d
d. ! videoconvert ! transcriberbin.sink_video
d. ! clocksync ! audioconvert ! transcriberbin.sink_audio
transcriberbin.src_video ! cea608overlay field=1 ! videoconvert ! autovideosink \
transcriberbin.src_audio ! audioconvert ! fakesink \
uridecodebin uri=file:///home/meh/Music/chaplin-spanish.webm name=d2 \
d2. ! audioconvert ! transcriberbin.sink_audio_0 \
transcriberbin.src_audio_0 ! fakesink
```
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1546>
sccparse holds last timecode in order to ignore invalid timecode
and fallback to the previous timecode. That should happen
when sccparse is handling seek event too. Otherwise single invalid
timecode before the target seek position will cause flow error.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1485>
