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webrtcsink: Translate force-keyunit events to force-IDR action signal for NVIDIA encoders

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NVIDIA's v4l2 encoder elements don't handle the force-keyunit events but
instead provide a custom action signal based API for requesting a
keyframe.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1286>
This commit is contained in:
Sebastian Dröge 2023-07-11 19:47:44 +03:00
parent 12bb9afd81
commit 369e555e13
1 changed files with 36 additions and 0 deletions
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36
net/webrtc/src/webrtcsink/imp.rs
View file

@ -414,6 +414,40 @@ fn make_converter_for_video_caps(caps: &gst::Caps) -> Result<gst::Element, Error
Ok(ret.upcast())
}
/// Add a pad probe to convert force-keyunit events to the custom action signal based NVIDIA
/// encoder API.
fn add_nv4l2enc_force_keyunit_workaround(enc: &gst::Element) {
use std::sync::atomic::{self, AtomicBool};
let srcpad = enc.static_pad("src").unwrap();
let saw_buffer = AtomicBool::new(false);
srcpad
.add_probe(
gst::PadProbeType::BUFFER
| gst::PadProbeType::BUFFER_LIST
| gst::PadProbeType::EVENT_UPSTREAM,
move |pad, info| {
match info.data {
Some(gst::PadProbeData::Buffer(..))
| Some(gst::PadProbeData::BufferList(..)) => {
saw_buffer.store(true, atomic::Ordering::SeqCst);
}
Some(gst::PadProbeData::Event(ref ev))
if gst_video::ForceKeyUnitEvent::is(ev)
&& saw_buffer.load(atomic::Ordering::SeqCst) =>
{
let enc = pad.parent().unwrap();
enc.emit_by_name::<()>("force-IDR", &[]);
}
_ => {}
}
gst::PadProbeReturn::Ok
},
)
.unwrap();
}
/// Default configuration for known encoders, can be disabled
/// by returning True from an encoder-setup handler.
fn configure_encoder(enc: &gst::Element, start_bitrate: u32) {
@ -462,6 +496,7 @@ fn configure_encoder(enc: &gst::Element, start_bitrate: u32) {
enc.set_property("insert-sps-pps", true);
enc.set_property("insert-aud", true);
enc.set_property_from_str("control-rate", "constant_bitrate");
add_nv4l2enc_force_keyunit_workaround(enc);
}
"nvv4l2vp8enc" | "nvv4l2vp9enc" => {
enc.set_property("bitrate", start_bitrate);
@ -469,6 +504,7 @@ fn configure_encoder(enc: &gst::Element, start_bitrate: u32) {
enc.set_property("maxperf-enable", true);
enc.set_property("idrinterval", 256u32);
enc.set_property_from_str("control-rate", "constant_bitrate");
add_nv4l2enc_force_keyunit_workaround(enc);
}
_ => (),
}