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feat(portal): independent WebRTC thread + channel tuning for 60fps mouse latency

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- Move WebRTC send to dedicated wl-webrtc-webrtc thread (was inline in main loop)
- Reduce frame_rx 16→1, input_tx 2→1 (drop-on-full), webrtc_tx 32→2
- Recv_timeout 10ms→2ms to reduce pipeline latency
- Fix sent_gap_p95 stats bug: compute gap at actual send time in WebRTC
  thread instead of batch-draining at snapshot time (was always 0.0ms)
- High profile via AVCodecContext.profile, veryfast preset, 5x bitrate
- Stats drain via sent_gap channel with record_send_from_thread()
- Shutdown: drop input_tx → join encode → drop webrtc_tx → join webrtc
This commit is contained in:
dailz
2026-06-07 18:30:09 +08:00
parent caccfec44e
commit 503e4dbc22
4 changed files with 156 additions and 99 deletions
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src/avhw.rs
+12 -10
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@@ -1330,7 +1330,7 @@ fn create_software_h264_muxer(
enc.set_bit_rate(bitrate as usize);
enc.set_gop(gop_size);
enc.set_time_base(ff::Rational::new(1, fps as i32));
enc.set_max_b_frames(0);
enc.set_max_b_frames(3);
// SAFETY: global headers are needed by MP4 and harmless for other common muxers.
unsafe {
@@ -1338,17 +1338,16 @@ fn create_software_h264_muxer(
}
if codec_name == "libx264" {
// SAFETY: priv_data belongs to the unopened encoder; strings live for each call.
// SAFETY: priv_data and codec context belong to the unopened encoder;
// strings live for each av_opt_set call.
unsafe {
let key = CString::new("preset").unwrap();
let val = CString::new("ultrafast").unwrap();
ffi::av_opt_set((*enc.as_mut_ptr()).priv_data, key.as_ptr(), val.as_ptr(), 0);
let key = CString::new("tune").unwrap();
let val = CString::new("zerolatency").unwrap();
let val = CString::new("fast").unwrap();
ffi::av_opt_set((*enc.as_mut_ptr()).priv_data, key.as_ptr(), val.as_ptr(), 0);
let key = CString::new("threads").unwrap();
let val = CString::new("6").unwrap();
ffi::av_opt_set((*enc.as_mut_ptr()).priv_data, key.as_ptr(), val.as_ptr(), 0);
(*enc.as_mut_ptr()).profile = ffi::AV_PROFILE_H264_HIGH as i32;
}
}
@@ -1458,11 +1457,11 @@ fn create_software_h264_encoder(
enc.set_max_b_frames(0);
if codec_name == "libx264" {
// SAFETY: priv_data belongs to the unopened encoder context; each
// CString lives for the duration of its av_opt_set call.
// SAFETY: priv_data and codec context belong to the unopened encoder;
// each CString lives for the duration of its av_opt_set call.
unsafe {
let key = CString::new("preset").unwrap();
let val = CString::new("ultrafast").unwrap();
let val = CString::new("veryfast").unwrap();
ffi::av_opt_set((*enc.as_mut_ptr()).priv_data, key.as_ptr(), val.as_ptr(), 0);
let key = CString::new("tune").unwrap();
let val = CString::new("zerolatency").unwrap();
@@ -1470,6 +1469,9 @@ fn create_software_h264_encoder(
let key = CString::new("threads").unwrap();
let val = CString::new("6").unwrap();
ffi::av_opt_set((*enc.as_mut_ptr()).priv_data, key.as_ptr(), val.as_ptr(), 0);
// High profile via AVCodecContext.profile (not x264opts — x264 rejects it there).
// High enables CABAC + 8x8dct automatically.
(*enc.as_mut_ptr()).profile = ffi::AV_PROFILE_H264_HIGH as i32;
let key = CString::new("x264opts").unwrap();
let val = CString::new("repeat_headers=1").unwrap();
ffi::av_opt_set((*enc.as_mut_ptr()).priv_data, key.as_ptr(), val.as_ptr(), 0);
@@ -1479,7 +1481,7 @@ fn create_software_h264_encoder(
let opened = enc
.open()
.map_err(|e| anyhow::anyhow!("Failed to open {codec_name} encoder: {e}"))?;
tracing::info!("WebRTC encoder: {codec_name} {width}x{height} @ {fps}fps {bitrate}bps");
tracing::info!("WebRTC encoder: {codec_name} {width}x{height} @ {fps}fps {bitrate}bps (profile High, preset veryfast)");
Ok(opened.0)
}