Add AV1 singlecast bitrate limits
Bug: b/300060059
Change-Id: I07763632b9fec19dae9d676bb2488cd7d2191e76
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/321660
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Reviewed-by: Michael Horowitz <mhoro@webrtc.org>
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40822}
diff --git a/rtc_base/experiments/encoder_info_settings.cc b/rtc_base/experiments/encoder_info_settings.cc
index 0097483..136201d 100644
--- a/rtc_base/experiments/encoder_info_settings.cc
+++ b/rtc_base/experiments/encoder_info_settings.cc
@@ -38,9 +38,26 @@
std::vector<VideoEncoder::ResolutionBitrateLimits>
EncoderInfoSettings::GetDefaultSinglecastBitrateLimits(
VideoCodecType codec_type) {
- // Specific limits for VP9. Determining specific limits for AV1 via
- // field trial experiment is a work in progress. Other codecs use VP8 limits.
+ if (codec_type == kVideoCodecAV1) {
+ // AV1 singlecast max bitrate limits are higher than AV1 SVC max limits.
+ // This is because in singlecast we normally have just one receiver, BWE is
+ // known end-to-end and the encode target bitrate guarantees delivery of
+ // video.
+ // The min bitrate limits are not used in singlecast (used in SVC/simulcast
+ // to de-/activate spatial layers) and are set to zero. Send resolution in
+ // singlecast is assumed to be regulated by QP-based quality scaler.
+ return {{320 * 180, 0, 0, 256000},
+ {480 * 270, 176000, 0, 384000},
+ {640 * 360, 256000, 0, 512000},
+ {960 * 540, 384000, 0, 1024000},
+ {1280 * 720, 576000, 0, 1536000}};
+ }
+
if (codec_type == kVideoCodecVP9) {
+ // VP9 singlecast bitrate limits are derived ~directly from VP9 SVC bitrate
+ // limits. The current max limits are unnecessarily too strict for
+ // singlecast, where BWE is known end-to-end, especially for low
+ // resolutions.
return {{320 * 180, 0, 30000, 150000},
{480 * 270, 120000, 30000, 300000},
{640 * 360, 190000, 30000, 420000},
@@ -48,6 +65,7 @@
{1280 * 720, 480000, 30000, 1500000}};
}
+ // VP8 and other codecs.
return {{320 * 180, 0, 30000, 300000},
{480 * 270, 200000, 30000, 500000},
{640 * 360, 300000, 30000, 800000},
