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transcriberbin: Wrap conversion channel elements into bin

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Make dynamic reconfiguration easier

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1162>
This commit is contained in:
Seungha Yang 2023-04-05 00:38:21 +09:00 committed by GStreamer Marge Bot
parent 884a8a8b23
commit 65c6117962
1 changed files with 45 additions and 55 deletions
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100
video/closedcaption/src/transcriberbin/imp.rs
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@ -37,7 +37,7 @@ const CEA608MUX_LATENCY: gst::ClockTime = gst::ClockTime::from_mseconds(100);
/* One per language, including original */
struct TranscriptionChannel {
queue: gst::Element,
bin: gst::Bin,
textwrap: gst::Element,
tttocea608: gst::Element,
language: String,
@ -58,7 +58,7 @@ impl TranscriptionChannel {
}
};
transcriber_src_pad.link(&self.queue.static_pad("sink").unwrap())?;
transcriber_src_pad.link(&self.bin.static_pad("sink").unwrap())?;
Ok(())
}
@ -120,6 +120,44 @@ pub struct TranscriberBin {
}
impl TranscriberBin {
fn construct_channel_bin(&self, lang: &str) -> Result<TranscriptionChannel, Error> {
let bin = gst::Bin::new(None);
let queue = gst::ElementFactory::make("queue").build()?;
let textwrap = gst::ElementFactory::make("textwrap").build()?;
let tttocea608 = gst::ElementFactory::make("tttocea608").build()?;
let capsfilter = gst::ElementFactory::make("capsfilter").build()?;
let converter = gst::ElementFactory::make("ccconverter").build()?;
bin.add_many([&queue, &textwrap, &tttocea608, &capsfilter, &converter])?;
gst::Element::link_many([&queue, &textwrap, &tttocea608, &capsfilter, &converter])?;
queue.set_property("max-size-buffers", 0u32);
queue.set_property("max-size-time", 0u64);
textwrap.set_property("lines", 2u32);
capsfilter.set_property(
"caps",
gst::Caps::builder("closedcaption/x-cea-608")
.field("format", "raw")
.field("framerate", gst::Fraction::new(30000, 1001))
.build(),
);
let sinkpad = gst::GhostPad::with_target(Some("sink"), &queue.static_pad("sink").unwrap())?;
let srcpad =
gst::GhostPad::with_target(Some("src"), &converter.static_pad("src").unwrap())?;
bin.add_pad(&sinkpad)?;
bin.add_pad(&srcpad)?;
Ok(TranscriptionChannel {
bin,
textwrap,
tttocea608,
language: String::from(lang),
})
}
fn construct_transcription_bin(&self, state: &mut State) -> Result<(), Error> {
gst::debug!(CAT, imp: self, "Building transcription bin");
@ -159,44 +197,14 @@ impl TranscriberBin {
])?;
for (padname, channel) in &state.transcription_channels {
let channel_capsfilter = gst::ElementFactory::make("capsfilter").build()?;
let channel_converter = gst::ElementFactory::make("ccconverter").build()?;
state.transcription_bin.add_many([
&channel.queue,
&channel.textwrap,
&channel.tttocea608,
&channel_capsfilter,
&channel_converter,
])?;
state.transcription_bin.add(&channel.bin)?;
channel.link_transcriber(&state.transcriber)?;
gst::Element::link_many([
&channel.queue,
&channel.textwrap,
&channel.tttocea608,
&channel_capsfilter,
&channel_converter,
])?;
let ccmux_pad = ccmux
.request_pad_simple(padname)
.ok_or(anyhow!("Failed to request ccmux sink pad"))?;
channel_converter
.static_pad("src")
.unwrap()
.link(&ccmux_pad)?;
channel_capsfilter.set_property(
"caps",
gst::Caps::builder("closedcaption/x-cea-608")
.field("format", "raw")
.field("framerate", gst::Fraction::new(30000, 1001))
.build(),
);
channel.queue.set_property("max-size-buffers", 0u32);
channel.queue.set_property("max-size-time", 0u64);
channel.textwrap.set_property("lines", 2u32);
channel.bin.static_pad("src").unwrap().link(&ccmux_pad)?;
}
ccmux.set_property("latency", CEA608MUX_LATENCY);
@ -471,7 +479,7 @@ impl TranscriberBin {
state.transcriber_aconv.unlink(old_transcriber);
for channel in state.transcription_channels.values() {
old_transcriber.unlink(&channel.queue);
old_transcriber.unlink(&channel.bin);
}
state.transcription_bin.remove(old_transcriber).unwrap();
old_transcriber.set_state(gst::State::Null).unwrap();
@ -577,31 +585,13 @@ impl TranscriberBin {
transcription_channels.insert(
channel.to_owned(),
TranscriptionChannel {
queue: gst::ElementFactory::make("queue").build()?,
textwrap: gst::ElementFactory::make("textwrap")
.name(format!("textwrap_{channel}"))
.build()?,
tttocea608: gst::ElementFactory::make("tttocea608")
.name(format!("tttocea608_{channel}"))
.build()?,
language: language_code,
},
self.construct_channel_bin(&language_code).unwrap(),
);
}
} else {
transcription_channels.insert(
"cc1".to_string(),
TranscriptionChannel {
queue: gst::ElementFactory::make("queue").build()?,
textwrap: gst::ElementFactory::make("textwrap")
.name("textwrap".to_string())
.build()?,
tttocea608: gst::ElementFactory::make("tttocea608")
.name("tttocea608".to_string())
.build()?,
language: "transcript".to_string(),
},
self.construct_channel_bin("transcript").unwrap(),
);
}