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b081042eec
We found that the legacy assumption for H264 which assumed that simulcast streams would use 2x width ratios in unnecessary as the encoder has since been fixed to handle multiple ratios. H264 encoder still works even if this assumption is invalid Bug: None Change-Id: I9caacf78d26c8215b94858a2d8674ec4cd64e96e Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/286940 Reviewed-by: Mirta Dvornicic <mirtad@google.com> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39072}
93 lines
2.9 KiB
C++
93 lines
2.9 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 "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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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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