105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
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/*
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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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if (codec.codecType == webrtc::kVideoCodecVP8) {
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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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} else {
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// TODO(mirtad): H264 encoder implementation still assumes the default
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// resolution downscaling is used.
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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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}
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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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