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// Copyright 2025 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::fmt::Debug;
use crate::{
imp::rtp_sender as imp_rs, media_stream_track::MediaStreamTrack, rtp_parameters::RtpParameters,
stats::RtcStats, RtcError,
};
/// Preferred backend for video encoding on an [`RtpSender`].
#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
#[non_exhaustive]
pub enum VideoEncoderBackend {
/// Use the SDK's default encoder selection.
#[default]
Auto,
/// Prefer a software encoder.
Software,
/// Prefer any available hardware encoder.
Hardware,
/// Prefer NVIDIA NVENC when available.
Nvenc,
/// Prefer VAAPI when available.
Vaapi,
/// Prefer VideoToolbox on Apple platforms when available.
VideoToolbox,
/// Pass pre-encoded frames through without encoding raw video frames.
PreEncoded,
}
impl VideoEncoderBackend {
/// Returns the video encoder backends available in this process.
///
/// The result reflects the current platform, build flags, and runtime
/// hardware capability checks.
///
/// ```
/// use libwebrtc::rtp_sender::VideoEncoderBackend;
///
/// let backends: Vec<_> = VideoEncoderBackend::list_available().into_iter().collect();
/// assert!(backends.contains(&VideoEncoderBackend::Auto));
/// assert!(backends.contains(&VideoEncoderBackend::Software));
/// ```
pub fn list_available() -> impl IntoIterator<Item = VideoEncoderBackend> {
imp_rs::video_encoder_backend_list()
}
}
#[derive(Clone)]
pub struct RtpSender {
pub(crate) handle: imp_rs::RtpSender,
}
impl RtpSender {
pub fn track(&self) -> Option<MediaStreamTrack> {
self.handle.track()
}
pub async fn get_stats(&self) -> Result<Vec<RtcStats>, RtcError> {
self.handle.get_stats().await
}
pub fn set_track(&self, track: Option<MediaStreamTrack>) -> Result<(), RtcError> {
self.handle.set_track(track)
}
pub fn parameters(&self) -> RtpParameters {
self.handle.parameters()
}
pub fn set_parameters(&self, parameters: RtpParameters) -> Result<(), RtcError> {
self.handle.set_parameters(parameters)
}
/// Sets the preferred video encoder backend for this sender.
///
/// If the requested backend is unavailable, libwebrtc falls back to another
/// compatible encoder.
pub fn set_video_encoder_backend(&self, backend: VideoEncoderBackend) {
self.handle.set_video_encoder_backend(backend)
}
}
impl Debug for RtpSender {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("RtpReceiver").field("cname", &self.parameters().rtcp.cname).finish()
}
}