mirror of
https://github.com/mollyim/webrtc.git
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7a82467d0d
1) Fix several typos and small mistakes which could lead to crashes 2) Adjust bitrates if leading layers are disabled 3) Wire up webrtc quality scaler Bug: webrtc:11319 Change-Id: I16e52bdb1c315d64906288e4f2be55fe698d5ceb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/177525 Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31546}
280 lines
11 KiB
C++
280 lines
11 KiB
C++
/*
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* Copyright (c) 2016 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/include/video_codec_initializer.h"
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#include <stdint.h>
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#include <string.h>
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#include <algorithm>
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#include "absl/types/optional.h"
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#include "api/scoped_refptr.h"
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#include "api/units/data_rate.h"
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#include "api/video/video_bitrate_allocation.h"
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#include "api/video_codecs/video_encoder.h"
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#include "modules/video_coding/codecs/vp9/svc_config.h"
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#include "modules/video_coding/include/video_coding_defines.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/experiments/min_video_bitrate_experiment.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/numerics/safe_conversions.h"
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namespace webrtc {
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bool VideoCodecInitializer::SetupCodec(const VideoEncoderConfig& config,
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const std::vector<VideoStream>& streams,
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VideoCodec* codec) {
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if (config.codec_type == kVideoCodecMultiplex) {
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VideoEncoderConfig associated_config = config.Copy();
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associated_config.codec_type = kVideoCodecVP9;
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if (!SetupCodec(associated_config, streams, codec)) {
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RTC_LOG(LS_ERROR) << "Failed to create stereo encoder configuration.";
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return false;
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}
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codec->codecType = kVideoCodecMultiplex;
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return true;
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}
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*codec = VideoEncoderConfigToVideoCodec(config, streams);
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return true;
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}
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// TODO(sprang): Split this up and separate the codec specific parts.
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VideoCodec VideoCodecInitializer::VideoEncoderConfigToVideoCodec(
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const VideoEncoderConfig& config,
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const std::vector<VideoStream>& streams) {
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static const int kEncoderMinBitrateKbps = 30;
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RTC_DCHECK(!streams.empty());
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RTC_DCHECK_GE(config.min_transmit_bitrate_bps, 0);
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VideoCodec video_codec;
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memset(&video_codec, 0, sizeof(video_codec));
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video_codec.codecType = config.codec_type;
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switch (config.content_type) {
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case VideoEncoderConfig::ContentType::kRealtimeVideo:
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video_codec.mode = VideoCodecMode::kRealtimeVideo;
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break;
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case VideoEncoderConfig::ContentType::kScreen:
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video_codec.mode = VideoCodecMode::kScreensharing;
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break;
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}
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// TODO(nisse): The plType field should be deleted. Luckily, our
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// callers don't need it.
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video_codec.plType = 0;
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video_codec.numberOfSimulcastStreams =
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static_cast<unsigned char>(streams.size());
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video_codec.minBitrate = streams[0].min_bitrate_bps / 1000;
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bool codec_active = false;
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// Active configuration might not be fully copied to |streams| for SVC yet.
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// Therefore the |config| is checked here.
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for (const VideoStream& stream : config.simulcast_layers) {
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if (stream.active) {
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codec_active = true;
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break;
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}
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}
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// Set active for the entire video codec for the non simulcast case.
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video_codec.active = codec_active;
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if (video_codec.minBitrate < kEncoderMinBitrateKbps)
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video_codec.minBitrate = kEncoderMinBitrateKbps;
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video_codec.timing_frame_thresholds = {kDefaultTimingFramesDelayMs,
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kDefaultOutlierFrameSizePercent};
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RTC_DCHECK_LE(streams.size(), kMaxSimulcastStreams);
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int max_framerate = 0;
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for (size_t i = 0; i < streams.size(); ++i) {
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SimulcastStream* sim_stream = &video_codec.simulcastStream[i];
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RTC_DCHECK_GT(streams[i].width, 0);
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RTC_DCHECK_GT(streams[i].height, 0);
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RTC_DCHECK_GT(streams[i].max_framerate, 0);
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RTC_DCHECK_GE(streams[i].min_bitrate_bps, 0);
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RTC_DCHECK_GE(streams[i].target_bitrate_bps, streams[i].min_bitrate_bps);
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RTC_DCHECK_GE(streams[i].max_bitrate_bps, streams[i].target_bitrate_bps);
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RTC_DCHECK_GE(streams[i].max_qp, 0);
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sim_stream->width = static_cast<uint16_t>(streams[i].width);
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sim_stream->height = static_cast<uint16_t>(streams[i].height);
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sim_stream->maxFramerate = streams[i].max_framerate;
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sim_stream->minBitrate = streams[i].min_bitrate_bps / 1000;
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sim_stream->targetBitrate = streams[i].target_bitrate_bps / 1000;
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sim_stream->maxBitrate = streams[i].max_bitrate_bps / 1000;
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sim_stream->qpMax = streams[i].max_qp;
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sim_stream->numberOfTemporalLayers =
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static_cast<unsigned char>(streams[i].num_temporal_layers.value_or(1));
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sim_stream->active = streams[i].active;
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video_codec.width =
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std::max(video_codec.width, static_cast<uint16_t>(streams[i].width));
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video_codec.height =
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std::max(video_codec.height, static_cast<uint16_t>(streams[i].height));
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video_codec.minBitrate =
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std::min(static_cast<uint16_t>(video_codec.minBitrate),
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static_cast<uint16_t>(streams[i].min_bitrate_bps / 1000));
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video_codec.maxBitrate += streams[i].max_bitrate_bps / 1000;
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video_codec.qpMax = std::max(video_codec.qpMax,
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static_cast<unsigned int>(streams[i].max_qp));
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max_framerate = std::max(max_framerate, streams[i].max_framerate);
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}
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if (video_codec.maxBitrate == 0) {
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// Unset max bitrate -> cap to one bit per pixel.
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video_codec.maxBitrate =
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(video_codec.width * video_codec.height * video_codec.maxFramerate) /
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1000;
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}
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if (video_codec.maxBitrate < kEncoderMinBitrateKbps)
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video_codec.maxBitrate = kEncoderMinBitrateKbps;
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video_codec.maxFramerate = max_framerate;
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// Set codec specific options
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if (config.encoder_specific_settings)
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config.encoder_specific_settings->FillEncoderSpecificSettings(&video_codec);
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switch (video_codec.codecType) {
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case kVideoCodecVP8: {
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if (!config.encoder_specific_settings) {
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*video_codec.VP8() = VideoEncoder::GetDefaultVp8Settings();
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}
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video_codec.VP8()->numberOfTemporalLayers = static_cast<unsigned char>(
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streams.back().num_temporal_layers.value_or(
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video_codec.VP8()->numberOfTemporalLayers));
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RTC_DCHECK_GE(video_codec.VP8()->numberOfTemporalLayers, 1);
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RTC_DCHECK_LE(video_codec.VP8()->numberOfTemporalLayers,
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kMaxTemporalStreams);
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break;
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}
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case kVideoCodecVP9: {
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// Force the first stream to always be active.
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video_codec.simulcastStream[0].active = codec_active;
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if (!config.encoder_specific_settings) {
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*video_codec.VP9() = VideoEncoder::GetDefaultVp9Settings();
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}
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video_codec.VP9()->numberOfTemporalLayers = static_cast<unsigned char>(
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streams.back().num_temporal_layers.value_or(
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video_codec.VP9()->numberOfTemporalLayers));
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RTC_DCHECK_GE(video_codec.VP9()->numberOfTemporalLayers, 1);
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RTC_DCHECK_LE(video_codec.VP9()->numberOfTemporalLayers,
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kMaxTemporalStreams);
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RTC_DCHECK(config.spatial_layers.empty() ||
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config.spatial_layers.size() ==
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video_codec.VP9()->numberOfSpatialLayers);
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std::vector<SpatialLayer> spatial_layers;
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if (!config.spatial_layers.empty()) {
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// Layering is set explicitly.
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spatial_layers = config.spatial_layers;
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} else {
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size_t first_active_layer = 0;
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for (size_t spatial_idx = 0;
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spatial_idx < config.simulcast_layers.size(); ++spatial_idx) {
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if (config.simulcast_layers[spatial_idx].active) {
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first_active_layer = spatial_idx;
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break;
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}
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}
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spatial_layers = GetSvcConfig(
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video_codec.width, video_codec.height, video_codec.maxFramerate,
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first_active_layer, video_codec.VP9()->numberOfSpatialLayers,
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video_codec.VP9()->numberOfTemporalLayers,
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video_codec.mode == VideoCodecMode::kScreensharing);
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// If there was no request for spatial layering, don't limit bitrate
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// of single spatial layer.
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const bool no_spatial_layering =
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video_codec.VP9()->numberOfSpatialLayers <= 1;
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if (no_spatial_layering) {
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// Use codec's bitrate limits.
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spatial_layers.back().minBitrate = video_codec.minBitrate;
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spatial_layers.back().targetBitrate = video_codec.maxBitrate;
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spatial_layers.back().maxBitrate = video_codec.maxBitrate;
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}
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for (size_t spatial_idx = first_active_layer;
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spatial_idx < config.simulcast_layers.size() &&
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spatial_idx < spatial_layers.size();
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++spatial_idx) {
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spatial_layers[spatial_idx - first_active_layer].active =
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config.simulcast_layers[spatial_idx].active;
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}
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}
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RTC_DCHECK(!spatial_layers.empty());
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for (size_t i = 0; i < spatial_layers.size(); ++i) {
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video_codec.spatialLayers[i] = spatial_layers[i];
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}
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// The top spatial layer dimensions may not be equal to the input
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// resolution because of the rounding or explicit configuration.
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// This difference must be propagated to the stream configuration.
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video_codec.width = spatial_layers.back().width;
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video_codec.height = spatial_layers.back().height;
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video_codec.simulcastStream[0].width = spatial_layers.back().width;
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video_codec.simulcastStream[0].height = spatial_layers.back().height;
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// Update layering settings.
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video_codec.VP9()->numberOfSpatialLayers =
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static_cast<unsigned char>(spatial_layers.size());
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RTC_DCHECK_GE(video_codec.VP9()->numberOfSpatialLayers, 1);
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RTC_DCHECK_LE(video_codec.VP9()->numberOfSpatialLayers,
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kMaxSpatialLayers);
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video_codec.VP9()->numberOfTemporalLayers = static_cast<unsigned char>(
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spatial_layers.back().numberOfTemporalLayers);
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RTC_DCHECK_GE(video_codec.VP9()->numberOfTemporalLayers, 1);
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RTC_DCHECK_LE(video_codec.VP9()->numberOfTemporalLayers,
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kMaxTemporalStreams);
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break;
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}
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case kVideoCodecH264: {
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if (!config.encoder_specific_settings)
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*video_codec.H264() = VideoEncoder::GetDefaultH264Settings();
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video_codec.H264()->numberOfTemporalLayers = static_cast<unsigned char>(
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streams.back().num_temporal_layers.value_or(
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video_codec.H264()->numberOfTemporalLayers));
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RTC_DCHECK_GE(video_codec.H264()->numberOfTemporalLayers, 1);
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RTC_DCHECK_LE(video_codec.H264()->numberOfTemporalLayers,
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kMaxTemporalStreams);
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break;
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}
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default:
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// TODO(pbos): Support encoder_settings codec-agnostically.
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RTC_DCHECK(!config.encoder_specific_settings)
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<< "Encoder-specific settings for codec type not wired up.";
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break;
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}
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const absl::optional<DataRate> experimental_min_bitrate =
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GetExperimentalMinVideoBitrate(video_codec.codecType);
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if (experimental_min_bitrate) {
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const int experimental_min_bitrate_kbps =
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rtc::saturated_cast<int>(experimental_min_bitrate->kbps());
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video_codec.minBitrate = experimental_min_bitrate_kbps;
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video_codec.simulcastStream[0].minBitrate = experimental_min_bitrate_kbps;
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if (video_codec.codecType == kVideoCodecVP9) {
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video_codec.spatialLayers[0].minBitrate = experimental_min_bitrate_kbps;
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}
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}
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return video_codec;
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}
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} // namespace webrtc
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