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/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/video_coding/include/video_codec_initializer.h"
#include "common_types.h" // NOLINT(build/include)
#include "common_video/include/video_bitrate_allocator.h"
#include "modules/video_coding/codecs/vp8/screenshare_layers.h"
#include "modules/video_coding/codecs/vp8/simulcast_rate_allocator.h"
#include "modules/video_coding/codecs/vp8/temporal_layers.h"
#include "modules/video_coding/include/video_coding_defines.h"
#include "modules/video_coding/utility/default_video_bitrate_allocator.h"
#include "rtc_base/basictypes.h"
#include "rtc_base/logging.h"
#include "system_wrappers/include/clock.h"
namespace webrtc {
namespace {
bool TemporalLayersConfigured(const std::vector<VideoStream>& streams) {
for (const VideoStream& stream : streams) {
if (stream.temporal_layer_thresholds_bps.size() > 0)
return true;
}
return false;
}
} // namespace
bool VideoCodecInitializer::SetupCodec(
const VideoEncoderConfig& config,
const VideoSendStream::Config::EncoderSettings settings,
const std::vector<VideoStream>& streams,
bool nack_enabled,
VideoCodec* codec,
std::unique_ptr<VideoBitrateAllocator>* bitrate_allocator) {
*codec =
VideoEncoderConfigToVideoCodec(config, streams, settings.payload_name,
settings.payload_type, nack_enabled);
std::unique_ptr<TemporalLayersFactory> tl_factory;
switch (codec->codecType) {
case kVideoCodecVP8: {
if (!codec->VP8()->tl_factory) {
if (codec->mode == kScreensharing &&
(codec->numberOfSimulcastStreams > 1 ||
(codec->numberOfSimulcastStreams == 1 &&
codec->VP8()->numberOfTemporalLayers == 2))) {
// Conference mode temporal layering for screen content.
tl_factory.reset(new ScreenshareTemporalLayersFactory());
} else {
// Standard video temporal layers.
tl_factory.reset(new TemporalLayersFactory());
}
codec->VP8()->tl_factory = tl_factory.get();
}
break;
}
default: {
// TODO(sprang): Warn, once we have specific allocators for all supported
// codec types.
break;
}
}
*bitrate_allocator = CreateBitrateAllocator(*codec, std::move(tl_factory));
return true;
}
std::unique_ptr<VideoBitrateAllocator>
VideoCodecInitializer::CreateBitrateAllocator(
const VideoCodec& codec,
std::unique_ptr<TemporalLayersFactory> tl_factory) {
std::unique_ptr<VideoBitrateAllocator> rate_allocator;
switch (codec.codecType) {
case kVideoCodecVP8: {
// Set up default VP8 temporal layer factory, if not provided.
rate_allocator.reset(
new SimulcastRateAllocator(codec, std::move(tl_factory)));
} break;
default:
rate_allocator.reset(new DefaultVideoBitrateAllocator(codec));
}
return rate_allocator;
}
// TODO(sprang): Split this up and separate the codec specific parts.
VideoCodec VideoCodecInitializer::VideoEncoderConfigToVideoCodec(
const VideoEncoderConfig& config,
const std::vector<VideoStream>& streams,
const std::string& payload_name,
int payload_type,
bool nack_enabled) {
static const int kEncoderMinBitrateKbps = 30;
RTC_DCHECK(!streams.empty());
RTC_DCHECK_GE(config.min_transmit_bitrate_bps, 0);
VideoCodec video_codec;
memset(&video_codec, 0, sizeof(video_codec));
video_codec.codecType = PayloadStringToCodecType(payload_name);
switch (config.content_type) {
case VideoEncoderConfig::ContentType::kRealtimeVideo:
video_codec.mode = kRealtimeVideo;
break;
case VideoEncoderConfig::ContentType::kScreen:
video_codec.mode = kScreensharing;
if (!streams.empty() &&
streams[0].temporal_layer_thresholds_bps.size() == 1) {
video_codec.targetBitrate =
streams[0].temporal_layer_thresholds_bps[0] / 1000;
}
break;
}
if (config.encoder_specific_settings)
config.encoder_specific_settings->FillEncoderSpecificSettings(&video_codec);
switch (video_codec.codecType) {
case kVideoCodecVP8: {
if (!config.encoder_specific_settings)
*video_codec.VP8() = VideoEncoder::GetDefaultVp8Settings();
video_codec.VP8()->numberOfTemporalLayers = static_cast<unsigned char>(
streams.back().temporal_layer_thresholds_bps.size() + 1);
if (nack_enabled && !TemporalLayersConfigured(streams)) {
RTC_LOG(LS_INFO)
<< "No temporal layers and nack enabled -> resilience off";
video_codec.VP8()->resilience = kResilienceOff;
}
break;
}
case kVideoCodecVP9: {
if (!config.encoder_specific_settings)
*video_codec.VP9() = VideoEncoder::GetDefaultVp9Settings();
if (video_codec.mode == kScreensharing &&
config.encoder_specific_settings) {
// See Bug 1525393 - flexibleMode is disabled until the next time we
// update webrtc.org due to changes in libvpx 1.8.2.
video_codec.VP9()->flexibleMode = false;
// For now VP9 screensharing use 1 temporal and 2 spatial layers.
RTC_DCHECK_EQ(1, video_codec.VP9()->numberOfTemporalLayers);
RTC_DCHECK_EQ(2, video_codec.VP9()->numberOfSpatialLayers);
}
video_codec.VP9()->numberOfTemporalLayers = static_cast<unsigned char>(
streams.back().temporal_layer_thresholds_bps.size() + 1);
if (nack_enabled && !TemporalLayersConfigured(streams) &&
video_codec.VP9()->numberOfSpatialLayers == 1) {
RTC_LOG(LS_INFO) << "No temporal or spatial layers and nack enabled -> "
<< "resilience off";
video_codec.VP9()->resilienceOn = false;
}
break;
}
case kVideoCodecH264: {
if (!config.encoder_specific_settings)
*video_codec.H264() = VideoEncoder::GetDefaultH264Settings();
break;
}
default:
// TODO(pbos): Support encoder_settings codec-agnostically.
RTC_DCHECK(!config.encoder_specific_settings)
<< "Encoder-specific settings for codec type not wired up.";
break;
}
strncpy(video_codec.plName, payload_name.c_str(), kPayloadNameSize - 1);
video_codec.plName[kPayloadNameSize - 1] = '\0';
video_codec.plType = payload_type;
video_codec.numberOfSimulcastStreams =
static_cast<unsigned char>(streams.size());
video_codec.minBitrate = streams[0].min_bitrate_bps / 1000;
if (video_codec.minBitrate < kEncoderMinBitrateKbps)
video_codec.minBitrate = kEncoderMinBitrateKbps;
video_codec.timing_frame_thresholds = {kDefaultTimingFramesDelayMs,
kDefaultOutlierFrameSizePercent};
RTC_DCHECK_LE(streams.size(), kMaxSimulcastStreams);
if (video_codec.codecType == kVideoCodecVP9) {
// If the vector is empty, bitrates will be configured automatically.
RTC_DCHECK(config.spatial_layers.empty() ||
config.spatial_layers.size() ==
video_codec.VP9()->numberOfSpatialLayers);
RTC_DCHECK_LE(video_codec.VP9()->numberOfSpatialLayers,
kMaxSimulcastStreams);
for (size_t i = 0; i < config.spatial_layers.size(); ++i)
video_codec.spatialLayers[i] = config.spatial_layers[i];
}
for (size_t i = 0; i < streams.size(); ++i) {
SimulcastStream* sim_stream = &video_codec.simulcastStream[i];
RTC_DCHECK_GT(streams[i].width, 0);
RTC_DCHECK_GT(streams[i].height, 0);
RTC_DCHECK_GT(streams[i].max_framerate, 0);
// Different framerates not supported per stream at the moment, unless it's
// screenshare where there is an exception and a simulcast encoder adapter,
// which supports different framerates, is used instead.
if (config.content_type != VideoEncoderConfig::ContentType::kScreen) {
RTC_DCHECK_EQ(streams[i].max_framerate, streams[0].max_framerate);
}
RTC_DCHECK_GE(streams[i].min_bitrate_bps, 0);
RTC_DCHECK_GE(streams[i].target_bitrate_bps, streams[i].min_bitrate_bps);
RTC_DCHECK_GE(streams[i].max_bitrate_bps, streams[i].target_bitrate_bps);
RTC_DCHECK_GE(streams[i].max_qp, 0);
sim_stream->width = static_cast<uint16_t>(streams[i].width);
sim_stream->height = static_cast<uint16_t>(streams[i].height);
sim_stream->minBitrate = streams[i].min_bitrate_bps / 1000;
sim_stream->targetBitrate = streams[i].target_bitrate_bps / 1000;
sim_stream->maxBitrate = streams[i].max_bitrate_bps / 1000;
sim_stream->qpMax = streams[i].max_qp;
// We know .rid is terminated
RTC_DCHECK(strlen(streams[i].rid) < sizeof(sim_stream->rid));
strncpy(sim_stream->rid, streams[i].rid, sizeof(sim_stream->rid));
sim_stream->numberOfTemporalLayers = static_cast<unsigned char>(
streams[i].temporal_layer_thresholds_bps.size() + 1);
video_codec.width =
std::max(video_codec.width, static_cast<uint16_t>(streams[i].width));
video_codec.height =
std::max(video_codec.height, static_cast<uint16_t>(streams[i].height));
video_codec.minBitrate =
std::min(static_cast<uint16_t>(video_codec.minBitrate),
static_cast<uint16_t>(streams[i].min_bitrate_bps / 1000));
video_codec.maxBitrate += streams[i].max_bitrate_bps / 1000;
video_codec.qpMax = std::max(video_codec.qpMax,
static_cast<unsigned int>(streams[i].max_qp));
}
if (video_codec.maxBitrate == 0) {
// Unset max bitrate -> cap to one bit per pixel.
video_codec.maxBitrate =
(video_codec.width * video_codec.height * video_codec.maxFramerate) /
1000;
}
if (video_codec.maxBitrate < kEncoderMinBitrateKbps)
video_codec.maxBitrate = kEncoderMinBitrateKbps;
RTC_DCHECK_GT(streams[0].max_framerate, 0);
video_codec.maxFramerate = streams[0].max_framerate;
return video_codec;
}
} // namespace webrtc
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