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transcriberbin: Wrap conversion channel elements into bin
Make dynamic reconfiguration easier Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1162>
This commit is contained in:
Seungha Yang
GStreamer Marge Bot
parent
884a8a8b23
commit
65c6117962
1 changed files with 45 additions and 55 deletions
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@ -37,7 +37,7 @@ const CEA608MUX_LATENCY: gst::ClockTime = gst::ClockTime::from_mseconds(100);
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/* One per language, including original */
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struct TranscriptionChannel {
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queue: gst::Element,
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bin: gst::Bin,
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textwrap: gst::Element,
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tttocea608: gst::Element,
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language: String,
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@ -58,7 +58,7 @@ impl TranscriptionChannel {
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}
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};
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transcriber_src_pad.link(&self.queue.static_pad("sink").unwrap())?;
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transcriber_src_pad.link(&self.bin.static_pad("sink").unwrap())?;
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Ok(())
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}
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@ -120,6 +120,44 @@ pub struct TranscriberBin {
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}
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impl TranscriberBin {
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fn construct_channel_bin(&self, lang: &str) -> Result<TranscriptionChannel, Error> {
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let bin = gst::Bin::new(None);
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let queue = gst::ElementFactory::make("queue").build()?;
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let textwrap = gst::ElementFactory::make("textwrap").build()?;
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let tttocea608 = gst::ElementFactory::make("tttocea608").build()?;
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let capsfilter = gst::ElementFactory::make("capsfilter").build()?;
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let converter = gst::ElementFactory::make("ccconverter").build()?;
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bin.add_many([&queue, &textwrap, &tttocea608, &capsfilter, &converter])?;
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gst::Element::link_many([&queue, &textwrap, &tttocea608, &capsfilter, &converter])?;
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queue.set_property("max-size-buffers", 0u32);
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queue.set_property("max-size-time", 0u64);
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textwrap.set_property("lines", 2u32);
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capsfilter.set_property(
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"caps",
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gst::Caps::builder("closedcaption/x-cea-608")
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.field("format", "raw")
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.field("framerate", gst::Fraction::new(30000, 1001))
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.build(),
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);
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let sinkpad = gst::GhostPad::with_target(Some("sink"), &queue.static_pad("sink").unwrap())?;
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let srcpad =
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gst::GhostPad::with_target(Some("src"), &converter.static_pad("src").unwrap())?;
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bin.add_pad(&sinkpad)?;
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bin.add_pad(&srcpad)?;
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Ok(TranscriptionChannel {
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bin,
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textwrap,
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tttocea608,
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language: String::from(lang),
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})
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}
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fn construct_transcription_bin(&self, state: &mut State) -> Result<(), Error> {
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gst::debug!(CAT, imp: self, "Building transcription bin");
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@ -159,44 +197,14 @@ impl TranscriberBin {
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])?;
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for (padname, channel) in &state.transcription_channels {
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let channel_capsfilter = gst::ElementFactory::make("capsfilter").build()?;
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let channel_converter = gst::ElementFactory::make("ccconverter").build()?;
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state.transcription_bin.add_many([
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&channel.queue,
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&channel.textwrap,
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&channel.tttocea608,
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&channel_capsfilter,
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&channel_converter,
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])?;
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state.transcription_bin.add(&channel.bin)?;
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channel.link_transcriber(&state.transcriber)?;
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gst::Element::link_many([
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&channel.queue,
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&channel.textwrap,
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&channel.tttocea608,
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&channel_capsfilter,
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&channel_converter,
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])?;
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let ccmux_pad = ccmux
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.request_pad_simple(padname)
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.ok_or(anyhow!("Failed to request ccmux sink pad"))?;
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channel_converter
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.static_pad("src")
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.unwrap()
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.link(&ccmux_pad)?;
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channel_capsfilter.set_property(
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"caps",
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gst::Caps::builder("closedcaption/x-cea-608")
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.field("format", "raw")
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.field("framerate", gst::Fraction::new(30000, 1001))
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.build(),
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);
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channel.queue.set_property("max-size-buffers", 0u32);
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channel.queue.set_property("max-size-time", 0u64);
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channel.textwrap.set_property("lines", 2u32);
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channel.bin.static_pad("src").unwrap().link(&ccmux_pad)?;
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}
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ccmux.set_property("latency", CEA608MUX_LATENCY);
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@ -471,7 +479,7 @@ impl TranscriberBin {
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state.transcriber_aconv.unlink(old_transcriber);
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for channel in state.transcription_channels.values() {
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old_transcriber.unlink(&channel.queue);
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old_transcriber.unlink(&channel.bin);
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}
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state.transcription_bin.remove(old_transcriber).unwrap();
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old_transcriber.set_state(gst::State::Null).unwrap();
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@ -577,31 +585,13 @@ impl TranscriberBin {
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transcription_channels.insert(
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channel.to_owned(),
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TranscriptionChannel {
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queue: gst::ElementFactory::make("queue").build()?,
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textwrap: gst::ElementFactory::make("textwrap")
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.name(format!("textwrap_{channel}"))
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.build()?,
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tttocea608: gst::ElementFactory::make("tttocea608")
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.name(format!("tttocea608_{channel}"))
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.build()?,
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language: language_code,
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},
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self.construct_channel_bin(&language_code).unwrap(),
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);
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}
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} else {
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transcription_channels.insert(
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"cc1".to_string(),
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TranscriptionChannel {
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queue: gst::ElementFactory::make("queue").build()?,
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textwrap: gst::ElementFactory::make("textwrap")
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.name("textwrap".to_string())
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.build()?,
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tttocea608: gst::ElementFactory::make("tttocea608")
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.name("tttocea608".to_string())
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.build()?,
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language: "transcript".to_string(),
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},
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self.construct_channel_bin("transcript").unwrap(),
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);
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}
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