mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-05-20 09:18:15 +00:00
313 lines
9.9 KiB
Rust
313 lines
9.9 KiB
Rust
use gst::prelude::*;
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use gst::subclass::prelude::*;
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use gst::{gst_debug, gst_error, gst_log};
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use std::sync::Mutex;
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use once_cell::sync::Lazy;
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use crate::ndisrcmeta;
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"ndisrcdemux",
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gst::DebugColorFlags::empty(),
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Some("NewTek NDI Source Demuxer"),
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)
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});
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#[derive(Default)]
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struct State {
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combiner: gst_base::UniqueFlowCombiner,
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video_pad: Option<gst::Pad>,
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video_caps: Option<gst::Caps>,
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audio_pad: Option<gst::Pad>,
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audio_caps: Option<gst::Caps>,
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}
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pub struct NdiSrcDemux {
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sinkpad: gst::Pad,
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state: Mutex<State>,
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}
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#[glib::object_subclass]
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impl ObjectSubclass for NdiSrcDemux {
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const NAME: &'static str = "NdiSrcDemux";
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type Type = super::NdiSrcDemux;
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type ParentType = gst::Element;
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fn with_class(klass: &Self::Class) -> Self {
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let templ = klass.pad_template("sink").unwrap();
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let sinkpad = gst::Pad::builder_with_template(&templ, Some("sink"))
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.flags(gst::PadFlags::FIXED_CAPS)
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.chain_function(|pad, parent, buffer| {
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NdiSrcDemux::catch_panic_pad_function(
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parent,
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|| Err(gst::FlowError::Error),
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|self_, element| self_.sink_chain(pad, element, buffer),
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)
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})
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.event_function(|pad, parent, event| {
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NdiSrcDemux::catch_panic_pad_function(
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parent,
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|| false,
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|self_, element| self_.sink_event(pad, element, event),
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)
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})
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.build();
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Self {
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sinkpad,
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state: Mutex::new(State::default()),
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}
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}
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}
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impl ObjectImpl for NdiSrcDemux {
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fn constructed(&self, obj: &Self::Type) {
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self.parent_constructed(obj);
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obj.add_pad(&self.sinkpad).unwrap();
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}
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}
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impl GstObjectImpl for NdiSrcDemux {}
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impl ElementImpl for NdiSrcDemux {
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fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
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static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
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gst::subclass::ElementMetadata::new(
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"NewTek NDI Source Demuxer",
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"Demuxer/Audio/Video",
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"NewTek NDI source demuxer",
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"Sebastian Dröge <sebastian@centricular.com>",
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)
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});
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Some(&*ELEMENT_METADATA)
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}
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fn pad_templates() -> &'static [gst::PadTemplate] {
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static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
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let sink_pad_template = gst::PadTemplate::new(
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"sink",
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gst::PadDirection::Sink,
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gst::PadPresence::Always,
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&gst::Caps::builder("application/x-ndi").build(),
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)
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.unwrap();
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let audio_src_pad_template = gst::PadTemplate::new(
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"audio",
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gst::PadDirection::Src,
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gst::PadPresence::Sometimes,
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&gst::Caps::builder("audio/x-raw").build(),
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)
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.unwrap();
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let video_src_pad_template = gst::PadTemplate::new(
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"video",
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gst::PadDirection::Src,
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gst::PadPresence::Sometimes,
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&gst::Caps::builder("video/x-raw").build(),
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)
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.unwrap();
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vec![
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sink_pad_template,
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audio_src_pad_template,
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video_src_pad_template,
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]
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});
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PAD_TEMPLATES.as_ref()
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}
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fn change_state(
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&self,
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element: &Self::Type,
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transition: gst::StateChange,
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) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
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let res = self.parent_change_state(element, transition)?;
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match transition {
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gst::StateChange::PausedToReady => {
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let mut state = self.state.lock().unwrap();
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for pad in [state.audio_pad.take(), state.video_pad.take()]
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.iter()
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.flatten()
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{
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element.remove_pad(pad).unwrap();
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}
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*state = State::default();
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}
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_ => (),
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}
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Ok(res)
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}
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}
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impl NdiSrcDemux {
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fn sink_chain(
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&self,
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pad: &gst::Pad,
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element: &super::NdiSrcDemux,
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mut buffer: gst::Buffer,
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) -> Result<gst::FlowSuccess, gst::FlowError> {
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gst_log!(CAT, obj: pad, "Handling buffer {:?}", buffer);
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let meta = buffer.make_mut().meta_mut::<ndisrcmeta::NdiSrcMeta>().ok_or_else(|| {
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gst_error!(CAT, obj: element, "Buffer without NDI source meta");
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gst::FlowError::Error
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})?;
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let mut events = vec![];
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let srcpad;
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let mut add_pad = false;
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let mut state = self.state.lock().unwrap();
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let caps = meta.caps();
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match meta.stream_type() {
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ndisrcmeta::StreamType::Audio => {
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if let Some(ref pad) = state.audio_pad {
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srcpad = pad.clone();
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} else {
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gst_debug!(CAT, obj: element, "Adding audio pad with caps {}", caps);
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let klass = element.element_class();
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let templ = klass.pad_template("audio").unwrap();
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let pad = gst::Pad::builder_with_template(&templ, Some("audio"))
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.flags(gst::PadFlags::FIXED_CAPS)
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.build();
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let mut caps_event = Some(gst::event::Caps::new(&caps));
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self.sinkpad.sticky_events_foreach(|ev| {
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if ev.type_() < gst::EventType::Caps {
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events.push(ev.clone());
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} else {
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if let Some(ev) = caps_event.take() {
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events.push(ev);
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}
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if ev.type_() != gst::EventType::Caps {
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events.push(ev.clone());
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}
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}
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std::ops::ControlFlow::Continue(gst::EventForeachAction::Keep)
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});
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state.audio_caps = Some(caps.clone());
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state.audio_pad = Some(pad.clone());
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let _ = pad.set_active(true);
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for ev in events.drain(..) {
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let _ = pad.store_sticky_event(&ev);
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}
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state.combiner.add_pad(&pad);
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add_pad = true;
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srcpad = pad;
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}
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if state.audio_caps.as_ref() != Some(&caps) {
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gst_debug!(CAT, obj: element, "Audio caps changed to {}", caps);
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events.push(gst::event::Caps::new(&caps));
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state.audio_caps = Some(caps);
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}
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}
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ndisrcmeta::StreamType::Video => {
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if let Some(ref pad) = state.video_pad {
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srcpad = pad.clone();
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} else {
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gst_debug!(CAT, obj: element, "Adding video pad with caps {}", caps);
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let klass = element.element_class();
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let templ = klass.pad_template("video").unwrap();
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let pad = gst::Pad::builder_with_template(&templ, Some("video"))
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.flags(gst::PadFlags::FIXED_CAPS)
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.build();
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let mut caps_event = Some(gst::event::Caps::new(&caps));
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self.sinkpad.sticky_events_foreach(|ev| {
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if ev.type_() < gst::EventType::Caps {
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events.push(ev.clone());
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} else {
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if let Some(ev) = caps_event.take() {
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events.push(ev);
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}
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if ev.type_() != gst::EventType::Caps {
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events.push(ev.clone());
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}
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}
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std::ops::ControlFlow::Continue(gst::EventForeachAction::Keep)
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});
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state.video_caps = Some(caps.clone());
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state.video_pad = Some(pad.clone());
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let _ = pad.set_active(true);
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for ev in events.drain(..) {
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let _ = pad.store_sticky_event(&ev);
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}
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state.combiner.add_pad(&pad);
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add_pad = true;
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srcpad = pad;
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}
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if state.video_caps.as_ref() != Some(&caps) {
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gst_debug!(CAT, obj: element, "Video caps changed to {}", caps);
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events.push(gst::event::Caps::new(&caps));
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state.video_caps = Some(caps);
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}
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}
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}
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drop(state);
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meta.remove().unwrap();
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if add_pad {
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element.add_pad(&srcpad).unwrap();
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}
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for ev in events {
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srcpad.push_event(ev);
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}
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let res = srcpad.push(buffer);
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let mut state = self.state.lock().unwrap();
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state.combiner.update_pad_flow(&srcpad, res)
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}
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fn sink_event(&self,
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pad: &gst::Pad,
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element: &super::NdiSrcDemux,
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event: gst::Event
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) -> bool {
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use gst::EventView;
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gst_log!(CAT, obj: pad, "Handling event {:?}", event);
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if let EventView::Eos(_) = event.view() {
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if element.num_src_pads() == 0 {
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// error out on EOS if no src pad are available
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gst::element_error!(
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element,
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gst::StreamError::Demux,
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["EOS without available srcpad(s)"]
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);
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}
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}
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pad.event_default(Some(element), event)
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}
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}
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