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8abd56cfdf
This CL is a step towards making the TemporalLayers landable in api/ : * It splits TemporalLayers from TemporalLayersChecker * It initially renames temporal_layer.h to vp8_temporal_layers.h and moved it into the include/ folder * It removes the dependency on VideoCodec, which was essentially only used to determine if screenshare_layers or default_temporal_layers should be used, and the number of temporal temporal layers to use. Subsequent CLs will make further cleanup before attempting a move to api Bug: webrtc:9012 Change-Id: I87ea7aac66d39284eaebd86aa9d015aba2eaaaea Reviewed-on: https://webrtc-review.googlesource.com/94156 Commit-Queue: Erik Språng <sprang@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Stefan Holmer <stefan@webrtc.org> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24920}
92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <algorithm>
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#include "modules/video_coding/utility/simulcast_utility.h"
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namespace webrtc {
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uint32_t SimulcastUtility::SumStreamMaxBitrate(int streams,
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const VideoCodec& codec) {
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uint32_t bitrate_sum = 0;
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for (int i = 0; i < streams; ++i) {
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bitrate_sum += codec.simulcastStream[i].maxBitrate;
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}
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return bitrate_sum;
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}
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int SimulcastUtility::NumberOfSimulcastStreams(const VideoCodec& codec) {
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int streams =
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codec.numberOfSimulcastStreams < 1 ? 1 : codec.numberOfSimulcastStreams;
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uint32_t simulcast_max_bitrate = SumStreamMaxBitrate(streams, codec);
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if (simulcast_max_bitrate == 0) {
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streams = 1;
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}
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return streams;
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}
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bool SimulcastUtility::ValidSimulcastResolutions(const VideoCodec& codec,
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int num_streams) {
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if (codec.width != codec.simulcastStream[num_streams - 1].width ||
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codec.height != codec.simulcastStream[num_streams - 1].height) {
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return false;
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}
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for (int i = 0; i < num_streams; ++i) {
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if (codec.width * codec.simulcastStream[i].height !=
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codec.height * codec.simulcastStream[i].width) {
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return false;
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}
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}
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for (int i = 1; i < num_streams; ++i) {
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if (codec.simulcastStream[i].width !=
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codec.simulcastStream[i - 1].width * 2) {
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return false;
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}
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}
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return true;
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}
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bool SimulcastUtility::ValidSimulcastTemporalLayers(const VideoCodec& codec,
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int num_streams) {
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for (int i = 0; i < num_streams - 1; ++i) {
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if (codec.simulcastStream[i].numberOfTemporalLayers !=
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codec.simulcastStream[i + 1].numberOfTemporalLayers)
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return false;
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}
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return true;
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}
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bool SimulcastUtility::IsConferenceModeScreenshare(const VideoCodec& codec) {
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if (codec.mode != VideoCodecMode::kScreensharing ||
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NumberOfTemporalLayers(codec, 0) != 2) {
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return false;
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}
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// Fixed default bitrates for legacy screenshare layers mode.
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return (codec.numberOfSimulcastStreams == 0 && codec.maxBitrate == 1000) ||
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(codec.numberOfSimulcastStreams >= 1 &&
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codec.simulcastStream[0].maxBitrate == 1000 &&
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codec.simulcastStream[0].targetBitrate == 200);
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}
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int SimulcastUtility::NumberOfTemporalLayers(const VideoCodec& codec,
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int spatial_id) {
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uint8_t num_temporal_layers =
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std::max<uint8_t>(1, codec.VP8().numberOfTemporalLayers);
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if (codec.numberOfSimulcastStreams > 0) {
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RTC_DCHECK_LT(spatial_id, codec.numberOfSimulcastStreams);
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num_temporal_layers =
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std::max(num_temporal_layers,
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codec.simulcastStream[spatial_id].numberOfTemporalLayers);
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}
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return num_temporal_layers;
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}
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} // namespace webrtc
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