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transcriberbin: Add support for runtime translation-languages update

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Allows updating translation-languages at runtime

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1162>
This commit is contained in:
Seungha Yang 2023-04-05 01:25:40 +09:00
parent 65c6117962
commit 538e2e0c9e
2 changed files with 161 additions and 13 deletions
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4
docs/plugins/gst_plugins_cache.json
View file

@ -5020,9 +5020,9 @@
"blurb": "A map of CEA 608 channels to language codes, eg translation-languages=\"languages, CC1=fr, CC3=transcript\" will map the French translation to CC1 and the original transcript to CC3",
"conditionally-available": false,
"construct": false,
"construct-only": true,
"construct-only": false,
"controllable": false,
"mutable": "null",
"mutable": "playing",
"readable": true,
"type": "GstStructure",
"writable": true

170
video/closedcaption/src/transcriberbin/imp.rs
View file

@ -73,6 +73,7 @@ struct State {
audio_tee: gst::Element,
transcriber_aconv: gst::Element,
transcriber: gst::Element,
ccmux: gst::Element,
cccombiner: gst::Element,
transcription_bin: gst::Bin,
transcription_channels: HashMap<String, TranscriptionChannel>,
@ -168,16 +169,13 @@ impl TranscriberBin {
.property("max-size-time", 5_000_000_000u64)
.property_from_str("leaky", "downstream")
.build()?;
let ccmux = gst::ElementFactory::make("cea608mux")
.property_from_str("start-time-selection", "first")
.build()?;
let ccconverter = gst::ElementFactory::make("ccconverter").build()?;
state.transcription_bin.add_many([
&aqueue_transcription,
&state.transcriber_aconv,
&state.transcriber,
&ccmux,
&state.ccmux,
&ccconverter,
&state.cccapsfilter,
&state.transcription_valve,
@ -190,7 +188,7 @@ impl TranscriberBin {
])?;
gst::Element::link_many([
&ccmux,
&state.ccmux,
&ccconverter,
&state.cccapsfilter,
&state.transcription_valve,
@ -201,13 +199,14 @@ impl TranscriberBin {
channel.link_transcriber(&state.transcriber)?;
let ccmux_pad = ccmux
let ccmux_pad = state
.ccmux
.request_pad_simple(padname)
.ok_or(anyhow!("Failed to request ccmux sink pad"))?;
channel.bin.static_pad("src").unwrap().link(&ccmux_pad)?;
}
ccmux.set_property("latency", CEA608MUX_LATENCY);
state.ccmux.set_property("latency", CEA608MUX_LATENCY);
let transcription_audio_sinkpad = gst::GhostPad::with_target(
Some("sink"),
@ -358,9 +357,12 @@ impl TranscriberBin {
state.transcription_bin.set_locked_state(false);
state.transcription_bin.sync_state_with_parent().unwrap();
let audio_tee_pad = state.audio_tee.request_pad_simple("src_%u").unwrap();
let transcription_sink_pad = state.transcription_bin.static_pad("sink").unwrap();
audio_tee_pad.link(&transcription_sink_pad).unwrap();
// Might be linked already if "translation-languages" is set
if transcription_sink_pad.peer().is_none() {
let audio_tee_pad = state.audio_tee.request_pad_simple("src_%u").unwrap();
audio_tee_pad.link(&transcription_sink_pad).unwrap();
}
}
drop(settings);
@ -495,6 +497,139 @@ impl TranscriberBin {
Ok(())
}
fn reconfigure_channels(&self) -> Result<(), Error> {
let mut state = self.state.lock().unwrap();
if let Some(ref mut state) = state.as_mut() {
let settings = self.settings.lock().unwrap();
gst::debug!(
CAT,
imp: self,
"Updating transcription/translation channel configuration"
);
// Unlink sinkpad temporarily
let sinkpad = state.transcription_bin.static_pad("sink").unwrap();
let peer = sinkpad.peer();
if let Some(peer) = &peer {
gst::debug!(CAT, imp: self, "Unlinking {:?}", peer);
peer.unlink(&sinkpad)?;
state.audio_tee.release_request_pad(peer);
}
state.transcription_bin.set_locked_state(true);
state.transcription_bin.set_state(gst::State::Null).unwrap();
for channel in state.transcription_channels.values() {
let sinkpad = channel.bin.static_pad("sink").unwrap();
if let Some(peer) = sinkpad.peer() {
peer.unlink(&sinkpad)?;
if channel.language != "transcript" {
state.transcriber.release_request_pad(&peer);
}
}
let srcpad = channel.bin.static_pad("src").unwrap();
if let Some(peer) = srcpad.peer() {
srcpad.unlink(&peer)?;
state.ccmux.release_request_pad(&peer);
}
state.transcription_bin.remove(&channel.bin)?;
}
state.transcription_channels.clear();
if let Some(ref map) = settings.translation_languages {
for (key, value) in map.iter() {
let channel = key.to_lowercase();
if !["cc1", "cc3"].contains(&channel.as_str()) {
anyhow::bail!("Unknown 608 channel {}, valid values are cc1, cc3", channel);
}
let language_code = value.get::<String>()?;
state.transcription_channels.insert(
channel.to_owned(),
self.construct_channel_bin(&language_code).unwrap(),
);
}
} else {
state.transcription_channels.insert(
"cc1".to_string(),
self.construct_channel_bin("transcript").unwrap(),
);
}
for (padname, channel) in &state.transcription_channels {
state.transcription_bin.add(&channel.bin)?;
channel.link_transcriber(&state.transcriber)?;
let ccmux_pad = state
.ccmux
.request_pad_simple(padname)
.ok_or(anyhow!("Failed to request ccmux sink pad"))?;
channel.bin.static_pad("src").unwrap().link(&ccmux_pad)?;
}
drop(settings);
self.setup_cc_mode(state);
if !self.settings.lock().unwrap().passthrough {
gst::debug!(CAT, imp: self, "Syncing state with parent");
state.transcription_bin.set_locked_state(false);
state.transcription_bin.sync_state_with_parent()?;
let audio_tee_pad = state.audio_tee.request_pad_simple("src_%u").unwrap();
audio_tee_pad.link(&sinkpad)?;
}
}
Ok(())
}
fn update_channels(&self) {
let s = self.state.lock().unwrap();
if let Some(state) = s.as_ref() {
gst::debug!(
CAT,
imp: self,
"Schedule transcription/translation channel update"
);
let sinkpad = state.transcription_bin.static_pad("sink").unwrap();
let imp_weak = self.downgrade();
drop(s);
let _ = sinkpad.add_probe(
gst::PadProbeType::IDLE
| gst::PadProbeType::BUFFER
| gst::PadProbeType::EVENT_DOWNSTREAM,
move |_pad, _info| {
let imp = match imp_weak.upgrade() {
None => return gst::PadProbeReturn::Remove,
Some(imp) => imp,
};
if imp.reconfigure_channels().is_err() {
gst::element_imp_error!(
imp,
gst::StreamError::Failed,
["Couldn't reconfigure channels"]
);
}
gst::PadProbeReturn::Remove
},
);
} else {
gst::debug!(CAT, imp: self, "Transcriber is not configured yet");
}
}
#[allow(clippy::single_match)]
fn src_query(&self, pad: &gst::Pad, query: &mut gst::QueryRef) -> bool {
use gst::QueryViewMut;
@ -572,6 +707,9 @@ impl TranscriberBin {
let transcription_valve = gst::ElementFactory::make("valve")
.property_from_str("drop-mode", "transform-to-gap")
.build()?;
let ccmux = gst::ElementFactory::make("cea608mux")
.property_from_str("start-time-selection", "first")
.build()?;
let mut transcription_channels = HashMap::new();
@ -602,6 +740,7 @@ impl TranscriberBin {
video_queue,
transcriber_aconv,
transcriber,
ccmux,
audio_tee,
cccombiner,
transcription_bin,
@ -750,7 +889,7 @@ impl ObjectImpl for TranscriberBin {
glib::ParamSpecBoxed::builder::<gst::Structure>("translation-languages")
.nick("Translation languages")
.blurb("A map of CEA 608 channels to language codes, eg translation-languages=\"languages, CC1=fr, CC3=transcript\" will map the French translation to CC1 and the original transcript to CC3")
.construct_only()
.mutable_playing()
.build(),
glib::ParamSpecUInt::builder("translate-latency")
.nick("Translation Latency")
@ -842,7 +981,16 @@ impl ObjectImpl for TranscriberBin {
let mut settings = self.settings.lock().unwrap();
settings.translation_languages = value
.get::<Option<gst::Structure>>()
.expect("type checked upstream")
.expect("type checked upstream");
gst::debug!(
CAT,
imp: self,
"Updated translation-languages {:?}",
settings.translation_languages
);
drop(settings);
self.update_channels();
}
"translate-latency" => {
let mut settings = self.settings.lock().unwrap();