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ae82df718c
Bug: webrtc:13485 Change-Id: I352b15a65867f0d56fc8e9a9e03081bd3258108e Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/316283 Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40773}
115 lines
3.6 KiB
C++
115 lines
3.6 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 "modules/video_coding/utility/simulcast_utility.h"
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#include <algorithm>
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#include <cmath>
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#include "modules/video_coding/svc/scalability_mode_util.h"
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#include "rtc_base/checks.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::ValidSimulcastParameters(const VideoCodec& codec,
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int num_streams) {
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// Check resolution.
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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 < codec.simulcastStream[i - 1].width) {
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return false;
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}
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}
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// Check frame-rate.
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for (int i = 1; i < num_streams; ++i) {
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if (fabs(codec.simulcastStream[i].maxFramerate -
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codec.simulcastStream[i - 1].maxFramerate) > 1e-9) {
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return false;
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}
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}
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// Check temporal layers.
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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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return codec.mode == VideoCodecMode::kScreensharing &&
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codec.legacy_conference_mode;
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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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int num_temporal_layers = 0;
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if (auto scalability_mode = codec.GetScalabilityMode(); scalability_mode) {
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num_temporal_layers = ScalabilityModeToNumTemporalLayers(*scalability_mode);
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} else {
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switch (codec.codecType) {
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case kVideoCodecVP8:
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num_temporal_layers = codec.VP8().numberOfTemporalLayers;
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break;
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case kVideoCodecVP9:
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num_temporal_layers = codec.VP9().numberOfTemporalLayers;
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break;
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case kVideoCodecH264:
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num_temporal_layers = codec.H264().numberOfTemporalLayers;
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break;
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case kVideoCodecH265:
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// TODO(bugs.webrtc.org/13485)
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break;
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default:
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break;
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}
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}
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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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static_cast<int>(
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codec.simulcastStream[spatial_id].numberOfTemporalLayers));
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}
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return std::max(1, num_temporal_layers);
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}
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} // namespace webrtc
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