diff options
Diffstat (limited to 'media')
| -rw-r--r-- | media/engine/simulcast.cc | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/media/engine/simulcast.cc b/media/engine/simulcast.cc index 722890c6dd..b2bc6e6d75 100644 --- a/media/engine/simulcast.cc +++ b/media/engine/simulcast.cc @@ -243,16 +243,25 @@ std::vector<webrtc::VideoStream> GetNormalSimulcastLayers( layers[s].max_bitrate_bps = FindSimulcastMaxBitrateBps(width, height); layers[s].target_bitrate_bps = FindSimulcastTargetBitrateBps(width, height); int num_temporal_layers = DefaultNumberOfTemporalLayers(s); - if (s == 0 && num_temporal_layers != 3) { + if (s == 0) { // If alternative number temporal layers is selected, adjust the // bitrate of the lowest simulcast stream so that absolute bitrate for // the base temporal layer matches the bitrate for the base temporal // layer with the default 3 simulcast streams. Otherwise we risk a // higher threshold for receiving a feed at all. - const float rate_factor = - webrtc::SimulcastRateAllocator::GetTemporalRateAllocation(3, 0) / - webrtc::SimulcastRateAllocator::GetTemporalRateAllocation( - num_temporal_layers, 0); + float rate_factor = 1.0; + if (num_temporal_layers == 3) { + if (webrtc::field_trial::IsEnabled("WebRTC-UseShortVP8TL3Pattern")) { + // Shortened pattern increases TL0 bitrate from 40% to 60%. + rate_factor = 0.4 / 0.6; + } + } else { + rate_factor = + webrtc::SimulcastRateAllocator::GetTemporalRateAllocation(3, 0) / + webrtc::SimulcastRateAllocator::GetTemporalRateAllocation( + num_temporal_layers, 0); + } + layers[s].max_bitrate_bps = static_cast<int>(layers[s].max_bitrate_bps * rate_factor); layers[s].target_bitrate_bps = |