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/*
* Copyright (c) 2017 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 <stddef.h>
#include <stdint.h>
#include <memory>
#include "absl/types/optional.h"
#include "api/video/builtin_video_bitrate_allocator_factory.h"
#include "api/video/video_bitrate_allocation.h"
#include "api/video/video_bitrate_allocator.h"
#include "api/video/video_bitrate_allocator_factory.h"
#include "api/video_codecs/create_vp8_temporal_layers.h"
#include "api/video_codecs/video_encoder.h"
#include "api/video_codecs/vp8_temporal_layers.h"
#include "common_types.h" // NOLINT(build/include)
#include "modules/video_coding/codecs/vp9/include/vp9_globals.h"
#include "rtc_base/checks.h"
#include "rtc_base/ref_counted_object.h"
#include "rtc_base/scoped_ref_ptr.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
static const int kDefaultWidth = 1280;
static const int kDefaultHeight = 720;
static const int kDefaultFrameRate = 30;
static const uint32_t kDefaultMinBitrateBps = 60000;
static const uint32_t kDefaultTargetBitrateBps = 2000000;
static const uint32_t kDefaultMaxBitrateBps = 2000000;
static const uint32_t kDefaultMinTransmitBitrateBps = 400000;
static const int kDefaultMaxQp = 48;
static const uint32_t kScreenshareTl0BitrateBps = 200000;
static const uint32_t kScreenshareCodecTargetBitrateBps = 200000;
static const uint32_t kScreenshareDefaultFramerate = 5;
// Bitrates for the temporal layers of the higher screenshare simulcast stream.
static const uint32_t kHighScreenshareTl0Bps = 800000;
static const uint32_t kHighScreenshareTl1Bps = 1200000;
} // namespace
// TODO(sprang): Extend coverage to handle the rest of the codec initializer.
class VideoCodecInitializerTest : public ::testing::Test {
public:
VideoCodecInitializerTest() {}
virtual ~VideoCodecInitializerTest() {}
protected:
void SetUpFor(VideoCodecType type,
int num_spatial_streams,
int num_temporal_streams,
bool screenshare) {
config_ = VideoEncoderConfig();
config_.codec_type = type;
if (screenshare) {
config_.min_transmit_bitrate_bps = kDefaultMinTransmitBitrateBps;
config_.content_type = VideoEncoderConfig::ContentType::kScreen;
}
if (type == VideoCodecType::kVideoCodecVP8) {
config_.number_of_streams = num_spatial_streams;
VideoCodecVP8 vp8_settings = VideoEncoder::GetDefaultVp8Settings();
vp8_settings.numberOfTemporalLayers = num_temporal_streams;
config_.encoder_specific_settings = new rtc::RefCountedObject<
webrtc::VideoEncoderConfig::Vp8EncoderSpecificSettings>(vp8_settings);
} else if (type == VideoCodecType::kVideoCodecVP9) {
VideoCodecVP9 vp9_settings = VideoEncoder::GetDefaultVp9Settings();
vp9_settings.numberOfSpatialLayers = num_spatial_streams;
vp9_settings.numberOfTemporalLayers = num_temporal_streams;
config_.encoder_specific_settings = new rtc::RefCountedObject<
webrtc::VideoEncoderConfig::Vp9EncoderSpecificSettings>(vp9_settings);
} else if (type != VideoCodecType::kVideoCodecMultiplex) {
ADD_FAILURE() << "Unexpected codec type: " << type;
}
}
bool InitializeCodec() {
codec_out_ = VideoCodec();
temporal_layers_.clear();
if (!VideoCodecInitializer::SetupCodec(config_, streams_, &codec_out_)) {
return false;
}
bitrate_allocator_ = CreateBuiltinVideoBitrateAllocatorFactory()
->CreateVideoBitrateAllocator(codec_out_);
RTC_CHECK(bitrate_allocator_);
if (codec_out_.codecType == VideoCodecType::kVideoCodecMultiplex)
return true;
// Make sure temporal layers instances have been created.
if (codec_out_.codecType == VideoCodecType::kVideoCodecVP8) {
for (int i = 0; i < codec_out_.numberOfSimulcastStreams; ++i) {
temporal_layers_.emplace_back(
CreateVp8TemporalLayers(Vp8TemporalLayersType::kFixedPattern,
codec_out_.VP8()->numberOfTemporalLayers));
}
}
return true;
}
VideoStream DefaultStream() {
VideoStream stream;
stream.width = kDefaultWidth;
stream.height = kDefaultHeight;
stream.max_framerate = kDefaultFrameRate;
stream.min_bitrate_bps = kDefaultMinBitrateBps;
stream.target_bitrate_bps = kDefaultTargetBitrateBps;
stream.max_bitrate_bps = kDefaultMaxBitrateBps;
stream.max_qp = kDefaultMaxQp;
stream.num_temporal_layers = 1;
stream.active = true;
return stream;
}
VideoStream DefaultScreenshareStream() {
VideoStream stream = DefaultStream();
stream.min_bitrate_bps = 30000;
stream.target_bitrate_bps = kScreenshareTl0BitrateBps;
stream.max_bitrate_bps = 1000000;
stream.max_framerate = kScreenshareDefaultFramerate;
stream.num_temporal_layers = 2;
stream.active = true;
return stream;
}
// Input settings.
VideoEncoderConfig config_;
std::vector<VideoStream> streams_;
// Output.
VideoCodec codec_out_;
std::unique_ptr<VideoBitrateAllocator> bitrate_allocator_;
std::vector<std::unique_ptr<Vp8TemporalLayers>> temporal_layers_;
};
TEST_F(VideoCodecInitializerTest, SingleStreamVp8Screenshare) {
SetUpFor(VideoCodecType::kVideoCodecVP8, 1, 1, true);
streams_.push_back(DefaultStream());
EXPECT_TRUE(InitializeCodec());
VideoBitrateAllocation bitrate_allocation = bitrate_allocator_->GetAllocation(
kDefaultTargetBitrateBps, kDefaultFrameRate);
EXPECT_EQ(1u, codec_out_.numberOfSimulcastStreams);
EXPECT_EQ(1u, codec_out_.VP8()->numberOfTemporalLayers);
EXPECT_EQ(kDefaultTargetBitrateBps, bitrate_allocation.get_sum_bps());
}
TEST_F(VideoCodecInitializerTest, SingleStreamVp8ScreenshareInactive) {
SetUpFor(VideoCodecType::kVideoCodecVP8, 1, 1, true);
VideoStream inactive_stream = DefaultStream();
inactive_stream.active = false;
streams_.push_back(inactive_stream);
EXPECT_TRUE(InitializeCodec());
VideoBitrateAllocation bitrate_allocation = bitrate_allocator_->GetAllocation(
kDefaultTargetBitrateBps, kDefaultFrameRate);
EXPECT_EQ(1u, codec_out_.numberOfSimulcastStreams);
EXPECT_EQ(1u, codec_out_.VP8()->numberOfTemporalLayers);
EXPECT_EQ(0U, bitrate_allocation.get_sum_bps());
}
TEST_F(VideoCodecInitializerTest, TemporalLayeredVp8Screenshare) {
SetUpFor(VideoCodecType::kVideoCodecVP8, 1, 2, true);
streams_.push_back(DefaultScreenshareStream());
EXPECT_TRUE(InitializeCodec());
EXPECT_EQ(1u, codec_out_.numberOfSimulcastStreams);
EXPECT_EQ(2u, codec_out_.VP8()->numberOfTemporalLayers);
VideoBitrateAllocation bitrate_allocation = bitrate_allocator_->GetAllocation(
kScreenshareCodecTargetBitrateBps, kScreenshareDefaultFramerate);
EXPECT_EQ(kScreenshareCodecTargetBitrateBps,
bitrate_allocation.get_sum_bps());
EXPECT_EQ(kScreenshareTl0BitrateBps, bitrate_allocation.GetBitrate(0, 0));
}
TEST_F(VideoCodecInitializerTest, SimulcastVp8Screenshare) {
SetUpFor(VideoCodecType::kVideoCodecVP8, 2, 1, true);
streams_.push_back(DefaultScreenshareStream());
VideoStream video_stream = DefaultStream();
video_stream.max_framerate = kScreenshareDefaultFramerate;
streams_.push_back(video_stream);
EXPECT_TRUE(InitializeCodec());
EXPECT_EQ(2u, codec_out_.numberOfSimulcastStreams);
EXPECT_EQ(1u, codec_out_.VP8()->numberOfTemporalLayers);
const uint32_t max_bitrate_bps =
streams_[0].target_bitrate_bps + streams_[1].max_bitrate_bps;
VideoBitrateAllocation bitrate_allocation = bitrate_allocator_->GetAllocation(
max_bitrate_bps, kScreenshareDefaultFramerate);
EXPECT_EQ(max_bitrate_bps, bitrate_allocation.get_sum_bps());
EXPECT_EQ(static_cast<uint32_t>(streams_[0].target_bitrate_bps),
bitrate_allocation.GetSpatialLayerSum(0));
EXPECT_EQ(static_cast<uint32_t>(streams_[1].max_bitrate_bps),
bitrate_allocation.GetSpatialLayerSum(1));
}
// Tests that when a video stream is inactive, then the bitrate allocation will
// be 0 for that stream.
TEST_F(VideoCodecInitializerTest, SimulcastVp8ScreenshareInactive) {
SetUpFor(VideoCodecType::kVideoCodecVP8, 2, 1, true);
streams_.push_back(DefaultScreenshareStream());
VideoStream inactive_video_stream = DefaultStream();
inactive_video_stream.active = false;
inactive_video_stream.max_framerate = kScreenshareDefaultFramerate;
streams_.push_back(inactive_video_stream);
EXPECT_TRUE(InitializeCodec());
EXPECT_EQ(2u, codec_out_.numberOfSimulcastStreams);
EXPECT_EQ(1u, codec_out_.VP8()->numberOfTemporalLayers);
const uint32_t target_bitrate =
streams_[0].target_bitrate_bps + streams_[1].target_bitrate_bps;
VideoBitrateAllocation bitrate_allocation = bitrate_allocator_->GetAllocation(
target_bitrate, kScreenshareDefaultFramerate);
EXPECT_EQ(static_cast<uint32_t>(streams_[0].max_bitrate_bps),
bitrate_allocation.get_sum_bps());
EXPECT_EQ(static_cast<uint32_t>(streams_[0].max_bitrate_bps),
bitrate_allocation.GetSpatialLayerSum(0));
EXPECT_EQ(0U, bitrate_allocation.GetSpatialLayerSum(1));
}
TEST_F(VideoCodecInitializerTest, HighFpsSimulcastVp8Screenshare) {
// Two simulcast streams, the lower one using legacy settings (two temporal
// streams, 5fps), the higher one using 3 temporal streams and 30fps.
SetUpFor(VideoCodecType::kVideoCodecVP8, 2, 3, true);
streams_.push_back(DefaultScreenshareStream());
VideoStream video_stream = DefaultStream();
video_stream.num_temporal_layers = 3;
streams_.push_back(video_stream);
EXPECT_TRUE(InitializeCodec());
EXPECT_EQ(2u, codec_out_.numberOfSimulcastStreams);
EXPECT_EQ(3u, codec_out_.VP8()->numberOfTemporalLayers);
const uint32_t max_bitrate_bps =
streams_[0].target_bitrate_bps + streams_[1].max_bitrate_bps;
VideoBitrateAllocation bitrate_allocation =
bitrate_allocator_->GetAllocation(max_bitrate_bps, kDefaultFrameRate);
EXPECT_EQ(max_bitrate_bps, bitrate_allocation.get_sum_bps());
EXPECT_EQ(static_cast<uint32_t>(streams_[0].target_bitrate_bps),
bitrate_allocation.GetSpatialLayerSum(0));
EXPECT_EQ(static_cast<uint32_t>(streams_[1].max_bitrate_bps),
bitrate_allocation.GetSpatialLayerSum(1));
EXPECT_EQ(kHighScreenshareTl0Bps, bitrate_allocation.GetBitrate(1, 0));
EXPECT_EQ(kHighScreenshareTl1Bps - kHighScreenshareTl0Bps,
bitrate_allocation.GetBitrate(1, 1));
}
TEST_F(VideoCodecInitializerTest, SingleStreamMultiplexCodec) {
SetUpFor(VideoCodecType::kVideoCodecMultiplex, 1, 1, true);
streams_.push_back(DefaultStream());
EXPECT_TRUE(InitializeCodec());
}
TEST_F(VideoCodecInitializerTest, Vp9SvcDefaultLayering) {
SetUpFor(VideoCodecType::kVideoCodecVP9, 3, 3, false);
VideoStream stream = DefaultStream();
stream.num_temporal_layers = 3;
streams_.push_back(stream);
EXPECT_TRUE(InitializeCodec());
EXPECT_EQ(codec_out_.VP9()->numberOfSpatialLayers, 3u);
EXPECT_EQ(codec_out_.VP9()->numberOfTemporalLayers, 3u);
}
TEST_F(VideoCodecInitializerTest, Vp9SvcAdjustedLayering) {
SetUpFor(VideoCodecType::kVideoCodecVP9, 3, 3, false);
VideoStream stream = DefaultStream();
stream.num_temporal_layers = 3;
// Set resolution which is only enough to produce 2 spatial layers.
stream.width = kMinVp9SpatialLayerWidth * 2;
stream.height = kMinVp9SpatialLayerHeight * 2;
streams_.push_back(stream);
EXPECT_TRUE(InitializeCodec());
EXPECT_EQ(codec_out_.VP9()->numberOfSpatialLayers, 2u);
}
TEST_F(VideoCodecInitializerTest,
Vp9SingleSpatialLayerMaxBitrateIsEqualToCodecMaxBitrate) {
SetUpFor(VideoCodecType::kVideoCodecVP9, 1, 3, false);
VideoStream stream = DefaultStream();
stream.num_temporal_layers = 3;
streams_.push_back(stream);
EXPECT_TRUE(InitializeCodec());
EXPECT_EQ(codec_out_.spatialLayers[0].maxBitrate,
kDefaultMaxBitrateBps / 1000);
}
TEST_F(VideoCodecInitializerTest,
Vp9KeepBitrateLimitsIfNumberOfSpatialLayersIsReducedToOne) {
// Request 3 spatial layers for 320x180 input. Actual number of layers will be
// reduced to 1 due to low input resolution but SVC bitrate limits should be
// applied.
SetUpFor(VideoCodecType::kVideoCodecVP9, 3, 3, false);
VideoStream stream = DefaultStream();
stream.width = 320;
stream.height = 180;
stream.num_temporal_layers = 3;
streams_.push_back(stream);
EXPECT_TRUE(InitializeCodec());
EXPECT_LT(codec_out_.spatialLayers[0].maxBitrate,
kDefaultMaxBitrateBps / 1000);
}
TEST_F(VideoCodecInitializerTest, Vp9DeactivateLayers) {
SetUpFor(VideoCodecType::kVideoCodecVP9, 3, 1, false);
VideoStream stream = DefaultStream();
streams_.push_back(stream);
config_.simulcast_layers.resize(3);
// Activate all layers.
config_.simulcast_layers[0].active = true;
config_.simulcast_layers[1].active = true;
config_.simulcast_layers[2].active = true;
EXPECT_TRUE(InitializeCodec());
EXPECT_TRUE(codec_out_.spatialLayers[0].active);
EXPECT_TRUE(codec_out_.spatialLayers[1].active);
EXPECT_TRUE(codec_out_.spatialLayers[2].active);
// Deactivate top layer.
config_.simulcast_layers[0].active = false;
EXPECT_TRUE(InitializeCodec());
EXPECT_TRUE(codec_out_.spatialLayers[0].active);
EXPECT_TRUE(codec_out_.spatialLayers[1].active);
EXPECT_FALSE(codec_out_.spatialLayers[2].active);
// Deactivate middle layer.
config_.simulcast_layers[0].active = true;
config_.simulcast_layers[1].active = false;
EXPECT_TRUE(InitializeCodec());
EXPECT_TRUE(codec_out_.spatialLayers[0].active);
EXPECT_FALSE(codec_out_.spatialLayers[1].active);
EXPECT_TRUE(codec_out_.spatialLayers[2].active);
}
} // namespace webrtc