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webrtc / src / ab009c27b4ff22b15f81a2de730f3075bf676cfd / . / test / video_codec_tester.cc
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/*
* Copyright (c) 2022 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 "test/video_codec_tester.h"
#include <algorithm>
#include <numeric>
#include <set>
#include <tuple>
#include <utility>
#include "absl/strings/match.h"
#include "api/array_view.h"
#include "api/environment/environment.h"
#include "api/environment/environment_factory.h"
#include "api/test/create_frame_generator.h"
#include "api/test/frame_generator_interface.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "api/video/builtin_video_bitrate_allocator_factory.h"
#include "api/video/i420_buffer.h"
#include "api/video/video_bitrate_allocator.h"
#include "api/video/video_codec_type.h"
#include "api/video/video_frame.h"
#include "api/video_codecs/h264_profile_level_id.h"
#include "api/video_codecs/simulcast_stream.h"
#include "api/video_codecs/video_decoder.h"
#include "api/video_codecs/video_encoder.h"
#include "media/base/media_constants.h"
#include "modules/video_coding/codecs/av1/av1_svc_config.h"
#include "modules/video_coding/codecs/h264/include/h264.h"
#include "modules/video_coding/codecs/vp9/svc_config.h"
#include "modules/video_coding/include/video_codec_interface.h"
#include "modules/video_coding/include/video_error_codes.h"
#include "modules/video_coding/svc/scalability_mode_util.h"
#include "modules/video_coding/utility/ivf_file_writer.h"
#include "rtc_base/event.h"
#include "rtc_base/logging.h"
#include "rtc_base/strings/string_builder.h"
#include "rtc_base/synchronization/mutex.h"
#include "rtc_base/task_queue_for_test.h"
#include "rtc_base/time_utils.h"
#include "system_wrappers/include/sleep.h"
#include "test/testsupport/file_utils.h"
#include "test/testsupport/frame_reader.h"
#include "test/testsupport/video_frame_writer.h"
#include "third_party/libyuv/include/libyuv/compare.h"
#include "video/config/encoder_stream_factory.h"
namespace webrtc {
namespace test {
namespace {
using CodedVideoSource = VideoCodecTester::CodedVideoSource;
using VideoSourceSettings = VideoCodecTester::VideoSourceSettings;
using EncodingSettings = VideoCodecTester::EncodingSettings;
using LayerSettings = EncodingSettings::LayerSettings;
using LayerId = VideoCodecTester::LayerId;
using EncoderSettings = VideoCodecTester::EncoderSettings;
using DecoderSettings = VideoCodecTester::DecoderSettings;
using PacingSettings = VideoCodecTester::PacingSettings;
using PacingMode = PacingSettings::PacingMode;
using VideoCodecStats = VideoCodecTester::VideoCodecStats;
using DecodeCallback =
absl::AnyInvocable<void(const VideoFrame& decoded_frame)>;
using webrtc::test::ImprovementDirection;
constexpr Frequency k90kHz = Frequency::Hertz(90000);
const std::set<ScalabilityMode> kFullSvcScalabilityModes{
ScalabilityMode::kL2T1, ScalabilityMode::kL2T1h, ScalabilityMode::kL2T2,
ScalabilityMode::kL2T2h, ScalabilityMode::kL2T3, ScalabilityMode::kL2T3h,
ScalabilityMode::kL3T1, ScalabilityMode::kL3T1h, ScalabilityMode::kL3T2,
ScalabilityMode::kL3T2h, ScalabilityMode::kL3T3, ScalabilityMode::kL3T3h};
const std::set<ScalabilityMode> kKeySvcScalabilityModes{
ScalabilityMode::kL2T1_KEY, ScalabilityMode::kL2T2_KEY,
ScalabilityMode::kL2T2_KEY_SHIFT, ScalabilityMode::kL2T3_KEY,
ScalabilityMode::kL3T1_KEY, ScalabilityMode::kL3T2_KEY,
ScalabilityMode::kL3T3_KEY};
rtc::scoped_refptr<VideoFrameBuffer> ScaleFrame(
rtc::scoped_refptr<VideoFrameBuffer> buffer,
int scaled_width,
int scaled_height) {
if (buffer->width() == scaled_width && buffer->height() == scaled_height) {
return buffer;
}
return buffer->Scale(scaled_width, scaled_height);
}
// A video source that reads frames from YUV, Y4M or IVF (compressed with VPx,
// AV1 or H264) files.
class VideoSource {
public:
explicit VideoSource(VideoSourceSettings source_settings)
: source_settings_(source_settings) {
if (absl::EndsWith(source_settings.file_path, "ivf")) {
ivf_reader_ = CreateFromIvfFileFrameGenerator(CreateEnvironment(),
source_settings.file_path);
} else if (absl::EndsWith(source_settings.file_path, "y4m")) {
yuv_reader_ =
CreateY4mFrameReader(source_settings_.file_path,
YuvFrameReaderImpl::RepeatMode::kPingPong);
} else {
yuv_reader_ = CreateYuvFrameReader(
source_settings_.file_path, source_settings_.resolution,
YuvFrameReaderImpl::RepeatMode::kPingPong);
}
RTC_CHECK(ivf_reader_ || yuv_reader_);
}
VideoFrame PullFrame(uint32_t timestamp_rtp,
Resolution output_resolution,
Frequency output_framerate) {
// If the source and output frame rates differ, resampling is performed by
// skipping or repeating source frames.
time_delta_ = time_delta_.value_or(1 / source_settings_.framerate);
int seek = 0;
while (time_delta_->us() <= 0) {
*time_delta_ += 1 / source_settings_.framerate;
++seek;
}
*time_delta_ -= 1 / output_framerate;
if (seek > 0 || last_frame_ == nullptr) {
rtc::scoped_refptr<VideoFrameBuffer> buffer;
do {
if (yuv_reader_) {
buffer = yuv_reader_->PullFrame();
} else {
buffer = ivf_reader_->NextFrame().buffer;
}
} while (--seek > 0);
RTC_CHECK(buffer) << "Could not read frame. timestamp_rtp "
<< timestamp_rtp;
last_frame_ = buffer;
}
rtc::scoped_refptr<VideoFrameBuffer> buffer = ScaleFrame(
last_frame_, output_resolution.width, output_resolution.height);
return VideoFrame::Builder()
.set_video_frame_buffer(buffer)
.set_rtp_timestamp(timestamp_rtp)
.set_timestamp_us((timestamp_rtp / k90kHz).us())
.build();
}
private:
VideoSourceSettings source_settings_;
std::unique_ptr<FrameReader> yuv_reader_;
std::unique_ptr<FrameGeneratorInterface> ivf_reader_;
rtc::scoped_refptr<VideoFrameBuffer> last_frame_;
// Time delta between the source and output video. Used for frame rate
// scaling. This value increases by the source frame duration each time a
// frame is read from the source, and decreases by the output frame duration
// each time an output frame is delivered.
absl::optional<TimeDelta> time_delta_;
};
// Pacer calculates delay necessary to keep frame encode or decode call spaced
// from the previous calls by the pacing time. `Schedule` is expected to be
// called as close as possible to posting frame encode or decode task. This
// class is not thread safe.
class Pacer {
public:
explicit Pacer(PacingSettings settings)
: settings_(settings), delay_(TimeDelta::Zero()) {}
Timestamp Schedule(Timestamp timestamp) {
Timestamp now = Timestamp::Micros(rtc::TimeMicros());
if (settings_.mode == PacingMode::kNoPacing) {
return now;
}
Timestamp scheduled = now;
if (prev_scheduled_) {
scheduled = *prev_scheduled_ + PacingTime(timestamp);
if (scheduled < now) {
scheduled = now;
}
}
prev_timestamp_ = timestamp;
prev_scheduled_ = scheduled;
return scheduled;
}
private:
TimeDelta PacingTime(Timestamp timestamp) {
if (settings_.mode == PacingMode::kRealTime) {
return timestamp - *prev_timestamp_;
}
RTC_CHECK_EQ(PacingMode::kConstantRate, settings_.mode);
return 1 / settings_.constant_rate;
}
PacingSettings settings_;
absl::optional<Timestamp> prev_timestamp_;
absl::optional<Timestamp> prev_scheduled_;
TimeDelta delay_;
};
// A task queue that limits its maximum size and guarantees FIFO execution of
// the scheduled tasks.
class LimitedTaskQueue {
public:
// Frame reading, encoding and decoding are handled in separate threads. If
// encoding or decoding is slow, the frame reader may run far ahead, loading
// many large frames into memory. To prevent this, we limit the maximum size
// of the task queue. When this limit is reached, posting new tasks is blocked
// until the queue size is reduced by executing previous tasks.
static constexpr int kMaxTaskQueueSize = 3;
LimitedTaskQueue() : queue_size_(0) {}
void PostScheduledTask(absl::AnyInvocable<void() &&> task,
Timestamp scheduled) {
{
// Block posting new tasks until the queue size is reduced.
MutexLock lock(&mutex_);
while (queue_size_ >= kMaxTaskQueueSize) {
task_executed_.Wait(TimeDelta::Seconds(10));
task_executed_.Reset();
}
}
++queue_size_;
task_queue_.PostTask([this, task = std::move(task), scheduled]() mutable {
Timestamp now = Timestamp::Millis(rtc::TimeMillis());
int64_t wait_ms = (scheduled - now).ms();
if (wait_ms > 0) {
RTC_CHECK_LT(wait_ms, 10000) << "Too high wait_ms " << wait_ms;
SleepMs(wait_ms);
}
std::move(task)();
--queue_size_;
task_executed_.Set();
});
}
void PostTask(absl::AnyInvocable<void() &&> task) {
Timestamp now = Timestamp::Millis(rtc::TimeMillis());
PostScheduledTask(std::move(task), now);
}
void PostTaskAndWait(absl::AnyInvocable<void() &&> task) {
PostTask(std::move(task));
WaitForPreviouslyPostedTasks();
}
void WaitForPreviouslyPostedTasks() {
task_queue_.WaitForPreviouslyPostedTasks();
}
private:
TaskQueueForTest task_queue_;
std::atomic_int queue_size_;
rtc::Event task_executed_;
Mutex mutex_;
};
class TesterY4mWriter {
public:
explicit TesterY4mWriter(absl::string_view base_path)
: base_path_(base_path) {}
~TesterY4mWriter() {
task_queue_.SendTask([] {});
}
void Write(const VideoFrame& frame, int spatial_idx) {
task_queue_.PostTask([this, frame, spatial_idx] {
if (y4m_writers_.find(spatial_idx) == y4m_writers_.end()) {
std::string file_path =
base_path_ + "-s" + std::to_string(spatial_idx) + ".y4m";
Y4mVideoFrameWriterImpl* y4m_writer = new Y4mVideoFrameWriterImpl(
file_path, frame.width(), frame.height(), /*fps=*/30);
RTC_CHECK(y4m_writer);
y4m_writers_[spatial_idx] =
std::unique_ptr<VideoFrameWriter>(y4m_writer);
}
y4m_writers_.at(spatial_idx)->WriteFrame(frame);
});
}
private:
std::string base_path_;
std::map<int, std::unique_ptr<VideoFrameWriter>> y4m_writers_;
TaskQueueForTest task_queue_;
};
class TesterIvfWriter {
public:
explicit TesterIvfWriter(absl::string_view base_path)
: base_path_(base_path) {}
~TesterIvfWriter() {
task_queue_.SendTask([] {});
}
void Write(const EncodedImage& encoded_frame, VideoCodecType codec_type) {
task_queue_.PostTask([this, encoded_frame, codec_type] {
int spatial_idx = encoded_frame.SpatialIndex().value_or(
encoded_frame.SimulcastIndex().value_or(0));
if (ivf_file_writers_.find(spatial_idx) == ivf_file_writers_.end()) {
std::string ivf_path =
base_path_ + "-s" + std::to_string(spatial_idx) + ".ivf";
FileWrapper ivf_file = FileWrapper::OpenWriteOnly(ivf_path);
RTC_CHECK(ivf_file.is_open());
std::unique_ptr<IvfFileWriter> ivf_writer =
IvfFileWriter::Wrap(std::move(ivf_file), /*byte_limit=*/0);
RTC_CHECK(ivf_writer);
ivf_file_writers_[spatial_idx] = std::move(ivf_writer);
}
// To play: ffplay -vcodec vp8|vp9|av1|hevc|h264 filename
ivf_file_writers_.at(spatial_idx)->WriteFrame(encoded_frame, codec_type);
});
}
private:
std::string base_path_;
std::map<int, std::unique_ptr<IvfFileWriter>> ivf_file_writers_;
TaskQueueForTest task_queue_;
};
class LeakyBucket {
public:
LeakyBucket() : level_bits_(0) {}
// Updates bucket level and returns its current level in bits. Data is removed
// from bucket with rate equal to target bitrate of previous frame. Bucket
// level is tracked with floating point precision. Returned value of bucket
// level is rounded up.
int Update(const VideoCodecStats::Frame& frame) {
RTC_CHECK(frame.target_bitrate) << "Bitrate must be specified.";
if (prev_frame_) {
RTC_CHECK_GT(frame.timestamp_rtp, prev_frame_->timestamp_rtp)
<< "Timestamp must increase.";
TimeDelta passed =
(frame.timestamp_rtp - prev_frame_->timestamp_rtp) / k90kHz;
level_bits_ -=
prev_frame_->target_bitrate->bps<double>() * passed.seconds<double>();
level_bits_ = std::max(level_bits_, 0.0);
}
prev_frame_ = frame;
level_bits_ += frame.frame_size.bytes() * 8;
return static_cast<int>(std::ceil(level_bits_));
}
private:
absl::optional<VideoCodecStats::Frame> prev_frame_;
double level_bits_;
};
class VideoCodecAnalyzer : public VideoCodecTester::VideoCodecStats {
public:
void StartEncode(const VideoFrame& video_frame,
const EncodingSettings& encoding_settings) {
int64_t encode_start_us = rtc::TimeMicros();
task_queue_.PostTask([this, timestamp_rtp = video_frame.rtp_timestamp(),
encoding_settings, encode_start_us]() {
RTC_CHECK(frames_.find(timestamp_rtp) == frames_.end())
<< "Duplicate frame. Frame with timestamp " << timestamp_rtp
<< " was seen before";
Frame frame;
frame.timestamp_rtp = timestamp_rtp;
frame.encode_start = Timestamp::Micros(encode_start_us),
frames_.emplace(timestamp_rtp,
std::map<int, Frame>{{/*spatial_idx=*/0, frame}});
encoding_settings_.emplace(timestamp_rtp, encoding_settings);
});
}
void FinishEncode(const EncodedImage& encoded_frame) {
int64_t encode_finished_us = rtc::TimeMicros();
task_queue_.PostTask(
[this, timestamp_rtp = encoded_frame.RtpTimestamp(),
spatial_idx = encoded_frame.SpatialIndex().value_or(
encoded_frame.SimulcastIndex().value_or(0)),
temporal_idx = encoded_frame.TemporalIndex().value_or(0),
width = encoded_frame._encodedWidth,
height = encoded_frame._encodedHeight,
frame_type = encoded_frame._frameType,
frame_size_bytes = encoded_frame.size(), qp = encoded_frame.qp_,
encode_finished_us]() {
if (spatial_idx > 0) {
RTC_CHECK(frames_.find(timestamp_rtp) != frames_.end())
<< "Spatial layer 0 frame with timestamp " << timestamp_rtp
<< " was not seen before";
const Frame& base_frame =
frames_.at(timestamp_rtp).at(/*spatial_idx=*/0);
frames_.at(timestamp_rtp).emplace(spatial_idx, base_frame);
}
Frame& frame = frames_.at(timestamp_rtp).at(spatial_idx);
frame.layer_id = {.spatial_idx = spatial_idx,
.temporal_idx = temporal_idx};
frame.width = width;
frame.height = height;
frame.frame_size = DataSize::Bytes(frame_size_bytes);
frame.qp = qp;
frame.keyframe = frame_type == VideoFrameType::kVideoFrameKey;
frame.encode_time =
Timestamp::Micros(encode_finished_us) - frame.encode_start;
frame.encoded = true;
});
}
void StartDecode(const EncodedImage& encoded_frame) {
int64_t decode_start_us = rtc::TimeMicros();
task_queue_.PostTask(
[this, timestamp_rtp = encoded_frame.RtpTimestamp(),
spatial_idx = encoded_frame.SpatialIndex().value_or(
encoded_frame.SimulcastIndex().value_or(0)),
temporal_idx = encoded_frame.TemporalIndex().value_or(0),
width = encoded_frame._encodedWidth,
height = encoded_frame._encodedHeight,
frame_type = encoded_frame._frameType, qp = encoded_frame.qp_,
frame_size_bytes = encoded_frame.size(), decode_start_us]() {
bool decode_only = frames_.find(timestamp_rtp) == frames_.end();
if (decode_only || frames_.at(timestamp_rtp).find(spatial_idx) ==
frames_.at(timestamp_rtp).end()) {
Frame frame;
frame.timestamp_rtp = timestamp_rtp;
frame.layer_id = {.spatial_idx = spatial_idx,
.temporal_idx = temporal_idx};
frame.width = width;
frame.height = height;
frame.keyframe = frame_type == VideoFrameType::kVideoFrameKey;
frame.qp = qp;
if (decode_only) {
frame.frame_size = DataSize::Bytes(frame_size_bytes);
frames_[timestamp_rtp] = {{spatial_idx, frame}};
} else {
frames_[timestamp_rtp][spatial_idx] = frame;
}
}
Frame& frame = frames_.at(timestamp_rtp).at(spatial_idx);
frame.decode_start = Timestamp::Micros(decode_start_us);
});
}
void FinishDecode(const VideoFrame& decoded_frame,
int spatial_idx,
absl::optional<VideoFrame> ref_frame = absl::nullopt) {
int64_t decode_finished_us = rtc::TimeMicros();
task_queue_.PostTask([this, timestamp_rtp = decoded_frame.rtp_timestamp(),
spatial_idx, width = decoded_frame.width(),
height = decoded_frame.height(),
decode_finished_us]() {
Frame& frame = frames_.at(timestamp_rtp).at(spatial_idx);
frame.decode_time =
Timestamp::Micros(decode_finished_us) - frame.decode_start;
if (!frame.encoded) {
frame.width = width;
frame.height = height;
}
frame.decoded = true;
});
if (ref_frame.has_value()) {
// Copy hardware-backed frame into main memory to release output buffers
// which number may be limited in hardware decoders.
rtc::scoped_refptr<I420BufferInterface> decoded_buffer =
decoded_frame.video_frame_buffer()->ToI420();
task_queue_.PostTask([this, decoded_buffer, ref_frame,
timestamp_rtp = decoded_frame.rtp_timestamp(),
spatial_idx]() {
rtc::scoped_refptr<I420BufferInterface> ref_buffer =
ScaleFrame(ref_frame->video_frame_buffer(), decoded_buffer->width(),
decoded_buffer->height())
->ToI420();
Frame& frame = frames_.at(timestamp_rtp).at(spatial_idx);
frame.psnr = CalcPsnr(*decoded_buffer, *ref_buffer);
});
}
}
std::vector<Frame> Slice(Filter filter, bool merge) const {
std::vector<Frame> slice;
for (const auto& [timestamp_rtp, temporal_unit_frames] : frames_) {
if (temporal_unit_frames.empty()) {
continue;
}
bool is_svc = false;
if (!encoding_settings_.empty()) {
ScalabilityMode scalability_mode =
encoding_settings_.at(timestamp_rtp).scalability_mode;
if (kFullSvcScalabilityModes.count(scalability_mode) > 0 ||
(kKeySvcScalabilityModes.count(scalability_mode) > 0 &&
temporal_unit_frames.at(0).keyframe)) {
is_svc = true;
}
}
std::vector<Frame> subframes;
for (const auto& [spatial_idx, frame] : temporal_unit_frames) {
if (frame.timestamp_rtp < filter.min_timestamp_rtp ||
frame.timestamp_rtp > filter.max_timestamp_rtp) {
continue;
}
if (filter.layer_id) {
if (is_svc &&
frame.layer_id.spatial_idx > filter.layer_id->spatial_idx) {
continue;
}
if (!is_svc &&
frame.layer_id.spatial_idx != filter.layer_id->spatial_idx) {
continue;
}
if (frame.layer_id.temporal_idx > filter.layer_id->temporal_idx) {
continue;
}
}
subframes.push_back(frame);
}
if (subframes.empty()) {
continue;
}
if (!merge) {
std::copy(subframes.begin(), subframes.end(),
std::back_inserter(slice));
continue;
}
Frame superframe = subframes.back();
for (const Frame& frame :
rtc::ArrayView<Frame>(subframes).subview(0, subframes.size() - 1)) {
superframe.decoded |= frame.decoded;
superframe.encoded |= frame.encoded;
superframe.frame_size += frame.frame_size;
superframe.keyframe |= frame.keyframe;
superframe.encode_time =
std::max(superframe.encode_time, frame.encode_time);
superframe.decode_time =
std::max(superframe.decode_time, frame.decode_time);
}
if (!encoding_settings_.empty()) {
RTC_CHECK(encoding_settings_.find(superframe.timestamp_rtp) !=
encoding_settings_.end())
<< "No encoding settings for frame " << superframe.timestamp_rtp;
const EncodingSettings& es =
encoding_settings_.at(superframe.timestamp_rtp);
superframe.target_bitrate = GetTargetBitrate(es, filter.layer_id);
superframe.target_framerate = GetTargetFramerate(es, filter.layer_id);
}
slice.push_back(superframe);
}
return slice;
}
Stream Aggregate(Filter filter) const {
std::vector<Frame> frames = Slice(filter, /*merge=*/true);
Stream stream;
LeakyBucket leaky_bucket;
for (const Frame& frame : frames) {
Timestamp time = Timestamp::Micros((frame.timestamp_rtp / k90kHz).us());
if (!frame.frame_size.IsZero()) {
stream.width.AddSample(StatsSample(frame.width, time));
stream.height.AddSample(StatsSample(frame.height, time));
stream.frame_size_bytes.AddSample(
StatsSample(frame.frame_size.bytes(), time));
stream.keyframe.AddSample(StatsSample(frame.keyframe, time));
if (frame.qp) {
stream.qp.AddSample(StatsSample(*frame.qp, time));
}
}
if (frame.encoded) {
stream.encode_time_ms.AddSample(
StatsSample(frame.encode_time.ms(), time));
}
if (frame.decoded) {
stream.decode_time_ms.AddSample(
StatsSample(frame.decode_time.ms(), time));
}
if (frame.psnr) {
stream.psnr.y.AddSample(StatsSample(frame.psnr->y, time));
stream.psnr.u.AddSample(StatsSample(frame.psnr->u, time));
stream.psnr.v.AddSample(StatsSample(frame.psnr->v, time));
}
if (frame.target_framerate) {
stream.target_framerate_fps.AddSample(
StatsSample(frame.target_framerate->hertz<double>(), time));
}
if (frame.target_bitrate) {
stream.target_bitrate_kbps.AddSample(
StatsSample(frame.target_bitrate->kbps<double>(), time));
int buffer_level_bits = leaky_bucket.Update(frame);
stream.transmission_time_ms.AddSample(StatsSample(
1000 * buffer_level_bits / frame.target_bitrate->bps<double>(),
time));
}
}
int num_encoded_frames = stream.frame_size_bytes.NumSamples();
if (num_encoded_frames == 0) {
return stream;
}
const Frame& first_frame = frames.front();
Filter filter_all_layers{.min_timestamp_rtp = filter.min_timestamp_rtp,
.max_timestamp_rtp = filter.max_timestamp_rtp};
std::vector<Frame> frames_all_layers =
Slice(filter_all_layers, /*merge=*/true);
const Frame& last_frame = frames_all_layers.back();
TimeDelta duration =
(last_frame.timestamp_rtp - first_frame.timestamp_rtp) / k90kHz;
if (last_frame.target_framerate) {
duration += 1 / *last_frame.target_framerate;
}
DataRate encoded_bitrate =
DataSize::Bytes(stream.frame_size_bytes.GetSum()) / duration;
Frequency encoded_framerate = num_encoded_frames / duration;
double bitrate_mismatch_pct = 0.0;
if (const auto& target_bitrate = first_frame.target_bitrate;
target_bitrate) {
bitrate_mismatch_pct = 100 * (encoded_bitrate / *target_bitrate - 1);
}
double framerate_mismatch_pct = 0.0;
if (const auto& target_framerate = first_frame.target_framerate;
target_framerate) {
framerate_mismatch_pct =
100 * (encoded_framerate / *target_framerate - 1);
}
for (Frame& frame : frames) {
Timestamp time = Timestamp::Micros((frame.timestamp_rtp / k90kHz).us());
stream.encoded_bitrate_kbps.AddSample(
StatsSample(encoded_bitrate.kbps<double>(), time));
stream.encoded_framerate_fps.AddSample(
StatsSample(encoded_framerate.hertz<double>(), time));
stream.bitrate_mismatch_pct.AddSample(
StatsSample(bitrate_mismatch_pct, time));
stream.framerate_mismatch_pct.AddSample(
StatsSample(framerate_mismatch_pct, time));
}
return stream;
}
void LogMetrics(absl::string_view csv_path,
std::vector<Frame> frames,
std::map<std::string, std::string> metadata) const {
RTC_LOG(LS_INFO) << "Write metrics to " << csv_path;
FILE* csv_file = fopen(csv_path.data(), "w");
const std::string delimiter = ";";
rtc::StringBuilder header;
header
<< "timestamp_rtp;spatial_idx;temporal_idx;width;height;frame_size_"
"bytes;keyframe;qp;encode_time_us;decode_time_us;psnr_y_db;psnr_u_"
"db;psnr_v_db;target_bitrate_kbps;target_framerate_fps";
for (const auto& data : metadata) {
header << ";" << data.first;
}
fwrite(header.str().c_str(), 1, header.size(), csv_file);
for (const Frame& f : frames) {
rtc::StringBuilder row;
row << "\n" << f.timestamp_rtp;
row << ";" << f.layer_id.spatial_idx;
row << ";" << f.layer_id.temporal_idx;
row << ";" << f.width;
row << ";" << f.height;
row << ";" << f.frame_size.bytes();
row << ";" << f.keyframe;
row << ";";
if (f.qp) {
row << *f.qp;
}
row << ";" << f.encode_time.us();
row << ";" << f.decode_time.us();
if (f.psnr) {
row << ";" << f.psnr->y;
row << ";" << f.psnr->u;
row << ";" << f.psnr->v;
} else {
row << ";;;";
}
const auto& es = encoding_settings_.at(f.timestamp_rtp);
row << ";"
<< f.target_bitrate.value_or(GetTargetBitrate(es, f.layer_id)).kbps();
row << ";"
<< f.target_framerate.value_or(GetTargetFramerate(es, f.layer_id))
.hertz<double>();
for (const auto& data : metadata) {
row << ";" << data.second;
}
fwrite(row.str().c_str(), 1, row.size(), csv_file);
}
fclose(csv_file);
}
void Flush() { task_queue_.WaitForPreviouslyPostedTasks(); }
private:
struct FrameId {
uint32_t timestamp_rtp;
int spatial_idx;
bool operator==(const FrameId& o) const {
return timestamp_rtp == o.timestamp_rtp && spatial_idx == o.spatial_idx;
}
bool operator<(const FrameId& o) const {
return timestamp_rtp < o.timestamp_rtp ||
(timestamp_rtp == o.timestamp_rtp && spatial_idx < o.spatial_idx);
}
};
Frame::Psnr CalcPsnr(const I420BufferInterface& ref_buffer,
const I420BufferInterface& dec_buffer) {
RTC_CHECK_EQ(ref_buffer.width(), dec_buffer.width());
RTC_CHECK_EQ(ref_buffer.height(), dec_buffer.height());
uint64_t sse_y = libyuv::ComputeSumSquareErrorPlane(
dec_buffer.DataY(), dec_buffer.StrideY(), ref_buffer.DataY(),
ref_buffer.StrideY(), dec_buffer.width(), dec_buffer.height());
uint64_t sse_u = libyuv::ComputeSumSquareErrorPlane(
dec_buffer.DataU(), dec_buffer.StrideU(), ref_buffer.DataU(),
ref_buffer.StrideU(), dec_buffer.width() / 2, dec_buffer.height() / 2);
uint64_t sse_v = libyuv::ComputeSumSquareErrorPlane(
dec_buffer.DataV(), dec_buffer.StrideV(), ref_buffer.DataV(),
ref_buffer.StrideV(), dec_buffer.width() / 2, dec_buffer.height() / 2);
int num_y_samples = dec_buffer.width() * dec_buffer.height();
Frame::Psnr psnr;
psnr.y = libyuv::SumSquareErrorToPsnr(sse_y, num_y_samples);
psnr.u = libyuv::SumSquareErrorToPsnr(sse_u, num_y_samples / 4);
psnr.v = libyuv::SumSquareErrorToPsnr(sse_v, num_y_samples / 4);
return psnr;
}
DataRate GetTargetBitrate(const EncodingSettings& encoding_settings,
absl::optional<LayerId> layer_id) const {
int base_spatial_idx;
if (layer_id.has_value()) {
bool is_svc =
kFullSvcScalabilityModes.count(encoding_settings.scalability_mode);
base_spatial_idx = is_svc ? 0 : layer_id->spatial_idx;
} else {
int num_spatial_layers =
ScalabilityModeToNumSpatialLayers(encoding_settings.scalability_mode);
int num_temporal_layers = ScalabilityModeToNumTemporalLayers(
encoding_settings.scalability_mode);
layer_id = LayerId({.spatial_idx = num_spatial_layers - 1,
.temporal_idx = num_temporal_layers - 1});
base_spatial_idx = 0;
}
DataRate bitrate = DataRate::Zero();
for (int sidx = base_spatial_idx; sidx <= layer_id->spatial_idx; ++sidx) {
for (int tidx = 0; tidx <= layer_id->temporal_idx; ++tidx) {
auto layer_settings = encoding_settings.layers_settings.find(
{.spatial_idx = sidx, .temporal_idx = tidx});
RTC_CHECK(layer_settings != encoding_settings.layers_settings.end())
<< "bitrate is not specified for layer sidx=" << sidx
<< " tidx=" << tidx;
bitrate += layer_settings->second.bitrate;
}
}
return bitrate;
}
Frequency GetTargetFramerate(const EncodingSettings& encoding_settings,
absl::optional<LayerId> layer_id) const {
if (layer_id.has_value()) {
auto layer_settings = encoding_settings.layers_settings.find(
{.spatial_idx = layer_id->spatial_idx,
.temporal_idx = layer_id->temporal_idx});
RTC_CHECK(layer_settings != encoding_settings.layers_settings.end())
<< "framerate is not specified for layer sidx="
<< layer_id->spatial_idx << " tidx=" << layer_id->temporal_idx;
return layer_settings->second.framerate;
}
return encoding_settings.layers_settings.rbegin()->second.framerate;
}
SamplesStatsCounter::StatsSample StatsSample(double value,
Timestamp time) const {
return SamplesStatsCounter::StatsSample{value, time};
}
LimitedTaskQueue task_queue_;
// RTP timestamp -> spatial layer -> Frame
std::map<uint32_t, std::map<int, Frame>> frames_;
std::map<uint32_t, EncodingSettings> encoding_settings_;
};
class Decoder : public DecodedImageCallback {
public:
Decoder(const Environment& env,
VideoDecoderFactory* decoder_factory,
const DecoderSettings& decoder_settings,
VideoCodecAnalyzer* analyzer)
: env_(env),
decoder_factory_(decoder_factory),
analyzer_(analyzer),
pacer_(decoder_settings.pacing_settings) {
RTC_CHECK(analyzer_) << "Analyzer must be provided";
if (decoder_settings.decoder_input_base_path) {
ivf_writer_ = std::make_unique<TesterIvfWriter>(
*decoder_settings.decoder_input_base_path);
}
if (decoder_settings.decoder_output_base_path) {
y4m_writer_ = std::make_unique<TesterY4mWriter>(
*decoder_settings.decoder_output_base_path);
}
}
void Initialize(const SdpVideoFormat& sdp_video_format) {
decoder_ = decoder_factory_->Create(env_, sdp_video_format);
RTC_CHECK(decoder_) << "Could not create decoder for video format "
<< sdp_video_format.ToString();
codec_type_ = PayloadStringToCodecType(sdp_video_format.name);
task_queue_.PostTaskAndWait([this] {
decoder_->RegisterDecodeCompleteCallback(this);
VideoDecoder::Settings ds;
ds.set_codec_type(*codec_type_);
ds.set_number_of_cores(1);
ds.set_max_render_resolution({1280, 720});
bool result = decoder_->Configure(ds);
RTC_CHECK(result) << "Failed to configure decoder";
});
}
void Decode(const EncodedImage& encoded_frame,
absl::optional<VideoFrame> ref_frame = absl::nullopt) {
int spatial_idx = encoded_frame.SpatialIndex().value_or(
encoded_frame.SimulcastIndex().value_or(0));
{
MutexLock lock(&mutex_);
RTC_CHECK_EQ(spatial_idx_.value_or(spatial_idx), spatial_idx)
<< "Spatial index changed from " << *spatial_idx_ << " to "
<< spatial_idx;
spatial_idx_ = spatial_idx;
if (ref_frame.has_value()) {
ref_frames_.insert({encoded_frame.RtpTimestamp(), *ref_frame});
}
}
Timestamp pts =
Timestamp::Micros((encoded_frame.RtpTimestamp() / k90kHz).us());
task_queue_.PostScheduledTask(
[this, encoded_frame] {
analyzer_->StartDecode(encoded_frame);
int error = decoder_->Decode(encoded_frame, /*render_time_ms*/ 0);
if (error != 0) {
RTC_LOG(LS_WARNING)
<< "Decode failed with error code " << error
<< " RTP timestamp " << encoded_frame.RtpTimestamp();
}
},
pacer_.Schedule(pts));
if (ivf_writer_) {
ivf_writer_->Write(encoded_frame, *codec_type_);
}
}
void Flush() {
// TODO(webrtc:14852): Add Flush() to VideoDecoder API.
task_queue_.PostTaskAndWait([this] { decoder_->Release(); });
}
private:
int Decoded(VideoFrame& decoded_frame) override {
int spatial_idx;
absl::optional<VideoFrame> ref_frame;
{
MutexLock lock(&mutex_);
spatial_idx = *spatial_idx_;
if (ref_frames_.size() > 0) {
auto it = ref_frames_.find(decoded_frame.rtp_timestamp());
RTC_CHECK(it != ref_frames_.end());
ref_frame = it->second;
ref_frames_.erase(ref_frames_.begin(), std::next(it));
}
}
analyzer_->FinishDecode(decoded_frame, spatial_idx, ref_frame);
if (y4m_writer_) {
y4m_writer_->Write(decoded_frame, spatial_idx);
}
return WEBRTC_VIDEO_CODEC_OK;
}
const Environment env_;
VideoDecoderFactory* decoder_factory_;
std::unique_ptr<VideoDecoder> decoder_;
VideoCodecAnalyzer* const analyzer_;
Pacer pacer_;
LimitedTaskQueue task_queue_;
std::unique_ptr<TesterIvfWriter> ivf_writer_;
std::unique_ptr<TesterY4mWriter> y4m_writer_;
absl::optional<VideoCodecType> codec_type_;
absl::optional<int> spatial_idx_ RTC_GUARDED_BY(mutex_);
std::map<uint32_t, VideoFrame> ref_frames_ RTC_GUARDED_BY(mutex_);
Mutex mutex_;
};
class Encoder : public EncodedImageCallback {
public:
using EncodeCallback =
absl::AnyInvocable<void(const EncodedImage& encoded_frame)>;
Encoder(const Environment& env,
VideoEncoderFactory* encoder_factory,
const EncoderSettings& encoder_settings,
VideoCodecAnalyzer* analyzer)
: env_(env),
encoder_factory_(encoder_factory),
analyzer_(analyzer),
pacer_(encoder_settings.pacing_settings) {
RTC_CHECK(analyzer_) << "Analyzer must be provided";
if (encoder_settings.encoder_input_base_path) {
y4m_writer_ = std::make_unique<TesterY4mWriter>(
*encoder_settings.encoder_input_base_path);
}
if (encoder_settings.encoder_output_base_path) {
ivf_writer_ = std::make_unique<TesterIvfWriter>(
*encoder_settings.encoder_output_base_path);
}
}
void Initialize(const EncodingSettings& encoding_settings) {
encoder_ =
encoder_factory_->Create(env_, encoding_settings.sdp_video_format);
RTC_CHECK(encoder_) << "Could not create encoder for video format "
<< encoding_settings.sdp_video_format.ToString();
codec_type_ =
PayloadStringToCodecType(encoding_settings.sdp_video_format.name);
task_queue_.PostTaskAndWait([this, encoding_settings] {
encoder_->RegisterEncodeCompleteCallback(this);
Configure(encoding_settings);
SetRates(encoding_settings);
});
}
void Encode(const VideoFrame& input_frame,
const EncodingSettings& encoding_settings,
EncodeCallback callback) {
{
MutexLock lock(&mutex_);
callbacks_[input_frame.rtp_timestamp()] = std::move(callback);
}
Timestamp pts =
Timestamp::Micros((input_frame.rtp_timestamp() / k90kHz).us());
task_queue_.PostScheduledTask(
[this, input_frame, encoding_settings] {
analyzer_->StartEncode(input_frame, encoding_settings);
if (!last_encoding_settings_ ||
!IsSameRate(encoding_settings, *last_encoding_settings_)) {
SetRates(encoding_settings);
}
last_encoding_settings_ = encoding_settings;
std::vector<VideoFrameType> frame_types = {
encoding_settings.keyframe ? VideoFrameType::kVideoFrameKey
: VideoFrameType::kVideoFrameDelta};
int error = encoder_->Encode(input_frame, &frame_types);
if (error != 0) {
RTC_LOG(LS_WARNING)
<< "Encode failed with error code " << error
<< " RTP timestamp " << input_frame.rtp_timestamp();
}
},
pacer_.Schedule(pts));
if (y4m_writer_) {
y4m_writer_->Write(input_frame, /*spatial_idx=*/0);
}
}
void Flush() {
task_queue_.PostTaskAndWait([this] { encoder_->Release(); });
if (last_superframe_) {
int num_spatial_layers =
ScalabilityModeToNumSpatialLayers(last_superframe_->scalability_mode);
for (int sidx = *last_superframe_->encoded_frame.SpatialIndex() + 1;
sidx < num_spatial_layers; ++sidx) {
last_superframe_->encoded_frame.SetSpatialIndex(sidx);
DeliverEncodedFrame(last_superframe_->encoded_frame);
}
last_superframe_.reset();
}
}
private:
struct Superframe {
EncodedImage encoded_frame;
rtc::scoped_refptr<EncodedImageBuffer> encoded_data;
ScalabilityMode scalability_mode;
};
Result OnEncodedImage(const EncodedImage& encoded_frame,
const CodecSpecificInfo* codec_specific_info) override {
analyzer_->FinishEncode(encoded_frame);
if (last_superframe_ && last_superframe_->encoded_frame.RtpTimestamp() !=
encoded_frame.RtpTimestamp()) {
// New temporal unit. We have frame of previous temporal unit (TU) stored
// which means that the previous TU used spatial prediction. If encoder
// dropped a frame of layer X in the previous TU, mark the stored frame
// as a frame belonging to layer >X and deliver it such that decoders of
// layer >X receive encoded lower layers.
int num_spatial_layers =
ScalabilityModeToNumSpatialLayers(last_superframe_->scalability_mode);
for (int sidx =
last_superframe_->encoded_frame.SpatialIndex().value_or(0) + 1;
sidx < num_spatial_layers; ++sidx) {
last_superframe_->encoded_frame.SetSpatialIndex(sidx);
DeliverEncodedFrame(last_superframe_->encoded_frame);
}
last_superframe_.reset();
}
const EncodedImage& superframe =
MakeSuperFrame(encoded_frame, codec_specific_info);
DeliverEncodedFrame(superframe);
return Result(Result::Error::OK);
}
void DeliverEncodedFrame(const EncodedImage& encoded_frame) {
{
MutexLock lock(&mutex_);
auto it = callbacks_.find(encoded_frame.RtpTimestamp());
RTC_CHECK(it != callbacks_.end());
it->second(encoded_frame);
callbacks_.erase(callbacks_.begin(), it);
}
if (ivf_writer_ != nullptr) {
ivf_writer_->Write(encoded_frame, codec_type_);
}
}
void Configure(const EncodingSettings& es) {
const LayerSettings& top_layer_settings =
es.layers_settings.rbegin()->second;
const int num_spatial_layers =
ScalabilityModeToNumSpatialLayers(es.scalability_mode);
const int num_temporal_layers =
ScalabilityModeToNumTemporalLayers(es.scalability_mode);
DataRate total_bitrate = std::accumulate(
es.layers_settings.begin(), es.layers_settings.end(), DataRate::Zero(),
[](DataRate acc, const std::pair<const LayerId, LayerSettings> layer) {
return acc + layer.second.bitrate;
});
VideoCodec vc;
vc.width = top_layer_settings.resolution.width;
vc.height = top_layer_settings.resolution.height;
vc.startBitrate = total_bitrate.kbps();
vc.maxBitrate = total_bitrate.kbps();
vc.minBitrate = 0;
vc.maxFramerate = top_layer_settings.framerate.hertz<uint32_t>();
vc.active = true;
vc.numberOfSimulcastStreams = 0;
vc.mode = es.content_type;
vc.SetFrameDropEnabled(es.frame_drop);
vc.SetScalabilityMode(es.scalability_mode);
vc.SetVideoEncoderComplexity(VideoCodecComplexity::kComplexityNormal);
vc.codecType = PayloadStringToCodecType(es.sdp_video_format.name);
switch (vc.codecType) {
case kVideoCodecVP8:
*(vc.VP8()) = VideoEncoder::GetDefaultVp8Settings();
vc.VP8()->SetNumberOfTemporalLayers(num_temporal_layers);
vc.SetScalabilityMode(std::vector<ScalabilityMode>{
ScalabilityMode::kL1T1, ScalabilityMode::kL1T2,
ScalabilityMode::kL1T3}[num_temporal_layers - 1]);
vc.qpMax = cricket::kDefaultVideoMaxQpVpx;
break;
case kVideoCodecVP9:
*(vc.VP9()) = VideoEncoder::GetDefaultVp9Settings();
vc.qpMax = cricket::kDefaultVideoMaxQpVpx;
break;
case kVideoCodecAV1:
vc.qpMax = cricket::kDefaultVideoMaxQpVpx;
break;
case kVideoCodecH264:
*(vc.H264()) = VideoEncoder::GetDefaultH264Settings();
vc.H264()->SetNumberOfTemporalLayers(num_temporal_layers);
vc.qpMax = cricket::kDefaultVideoMaxQpH26x;
break;
case kVideoCodecH265:
vc.qpMax = cricket::kDefaultVideoMaxQpH26x;
break;
case kVideoCodecGeneric:
RTC_CHECK_NOTREACHED();
break;
}
bool is_simulcast =
num_spatial_layers > 1 &&
(vc.codecType == kVideoCodecVP8 || vc.codecType == kVideoCodecH264 ||
vc.codecType == kVideoCodecH265);
if (is_simulcast) {
vc.numberOfSimulcastStreams = num_spatial_layers;
for (int sidx = 0; sidx < num_spatial_layers; ++sidx) {
auto tl0_settings = es.layers_settings.find(
LayerId{.spatial_idx = sidx, .temporal_idx = 0});
auto tlx_settings = es.layers_settings.find(LayerId{
.spatial_idx = sidx, .temporal_idx = num_temporal_layers - 1});
DataRate total_bitrate = std::accumulate(
tl0_settings, tlx_settings, DataRate::Zero(),
[](DataRate acc,
const std::pair<const LayerId, LayerSettings> layer) {
return acc + layer.second.bitrate;
});
SimulcastStream& ss = vc.simulcastStream[sidx];
ss.width = tl0_settings->second.resolution.width;
ss.height = tl0_settings->second.resolution.height;
ss.numberOfTemporalLayers = num_temporal_layers;
ss.maxBitrate = total_bitrate.kbps();
ss.targetBitrate = total_bitrate.kbps();
ss.minBitrate = 0;
ss.maxFramerate = vc.maxFramerate;
ss.qpMax = vc.qpMax;
ss.active = true;
}
}
VideoEncoder::Settings ves(
VideoEncoder::Capabilities(/*loss_notification=*/false),
/*number_of_cores=*/1,
/*max_payload_size=*/1440);
int result = encoder_->InitEncode(&vc, ves);
RTC_CHECK(result == WEBRTC_VIDEO_CODEC_OK);
}
void SetRates(const EncodingSettings& es) {
VideoEncoder::RateControlParameters rc;
int num_spatial_layers =
ScalabilityModeToNumSpatialLayers(es.scalability_mode);
int num_temporal_layers =
ScalabilityModeToNumTemporalLayers(es.scalability_mode);
for (int sidx = 0; sidx < num_spatial_layers; ++sidx) {
for (int tidx = 0; tidx < num_temporal_layers; ++tidx) {
auto layers_settings = es.layers_settings.find(
{.spatial_idx = sidx, .temporal_idx = tidx});
RTC_CHECK(layers_settings != es.layers_settings.end())
<< "Bitrate for layer S=" << sidx << " T=" << tidx << " is not set";
rc.bitrate.SetBitrate(sidx, tidx,
layers_settings->second.bitrate.bps());
}
}
rc.framerate_fps =
es.layers_settings.rbegin()->second.framerate.hertz<double>();
encoder_->SetRates(rc);
}
bool IsSameRate(const EncodingSettings& a, const EncodingSettings& b) const {
for (auto [layer_id, layer] : a.layers_settings) {
const auto& other_layer = b.layers_settings.at(layer_id);
if (layer.bitrate != other_layer.bitrate ||
layer.framerate != other_layer.framerate) {
return false;
}
}
return true;
}
static bool IsSvc(const EncodedImage& encoded_frame,
const CodecSpecificInfo& codec_specific_info) {
if (!codec_specific_info.scalability_mode) {
return false;
}
ScalabilityMode scalability_mode = *codec_specific_info.scalability_mode;
return (kFullSvcScalabilityModes.count(scalability_mode) ||
(kKeySvcScalabilityModes.count(scalability_mode) &&
encoded_frame.FrameType() == VideoFrameType::kVideoFrameKey));
}
const EncodedImage& MakeSuperFrame(
const EncodedImage& encoded_frame,
const CodecSpecificInfo* codec_specific_info) {
if (last_superframe_) {
// Append to base spatial layer frame(s).
RTC_CHECK_EQ(*encoded_frame.SpatialIndex(),
*last_superframe_->encoded_frame.SpatialIndex() + 1)
<< "Inter-layer frame drops are not supported.";
size_t current_size = last_superframe_->encoded_data->size();
last_superframe_->encoded_data->Realloc(current_size +
encoded_frame.size());
memcpy(last_superframe_->encoded_data->data() + current_size,
encoded_frame.data(), encoded_frame.size());
last_superframe_->encoded_frame.SetEncodedData(
last_superframe_->encoded_data);
last_superframe_->encoded_frame.SetSpatialIndex(
encoded_frame.SpatialIndex());
return last_superframe_->encoded_frame;
}
RTC_CHECK(codec_specific_info != nullptr);
if (IsSvc(encoded_frame, *codec_specific_info)) {
last_superframe_ = Superframe{
.encoded_frame = EncodedImage(encoded_frame),
.encoded_data = EncodedImageBuffer::Create(encoded_frame.data(),
encoded_frame.size()),
.scalability_mode = *codec_specific_info->scalability_mode};
last_superframe_->encoded_frame.SetEncodedData(
last_superframe_->encoded_data);
return last_superframe_->encoded_frame;
}
return encoded_frame;
}
const Environment env_;
VideoEncoderFactory* const encoder_factory_;
std::unique_ptr<VideoEncoder> encoder_;
VideoCodecAnalyzer* const analyzer_;
Pacer pacer_;
absl::optional<EncodingSettings> last_encoding_settings_;
std::unique_ptr<VideoBitrateAllocator> bitrate_allocator_;
LimitedTaskQueue task_queue_;
std::unique_ptr<TesterY4mWriter> y4m_writer_;
std::unique_ptr<TesterIvfWriter> ivf_writer_;
std::map<uint32_t, int> sidx_ RTC_GUARDED_BY(mutex_);
std::map<uint32_t, EncodeCallback> callbacks_ RTC_GUARDED_BY(mutex_);
VideoCodecType codec_type_;
absl::optional<Superframe> last_superframe_;
Mutex mutex_;
};
void ConfigureSimulcast(const FieldTrialsView& field_trials, VideoCodec* vc) {
int num_spatial_layers =
ScalabilityModeToNumSpatialLayers(*vc->GetScalabilityMode());
int num_temporal_layers =
ScalabilityModeToNumTemporalLayers(*vc->GetScalabilityMode());
if (num_spatial_layers == 1) {
SimulcastStream* ss = &vc->simulcastStream[0];
ss->width = vc->width;
ss->height = vc->height;
ss->numberOfTemporalLayers = num_temporal_layers;
ss->maxBitrate = vc->maxBitrate;
ss->targetBitrate = vc->maxBitrate;
ss->minBitrate = vc->minBitrate;
ss->qpMax = vc->qpMax;
ss->active = true;
return;
}
VideoEncoderConfig encoder_config;
encoder_config.codec_type = vc->codecType;
encoder_config.number_of_streams = num_spatial_layers;
encoder_config.simulcast_layers.resize(num_spatial_layers);
VideoEncoder::EncoderInfo encoder_info;
auto stream_factory =
rtc::make_ref_counted<cricket::EncoderStreamFactory>(encoder_info);
const std::vector<VideoStream> streams = stream_factory->CreateEncoderStreams(
field_trials, vc->width, vc->height, encoder_config);
vc->numberOfSimulcastStreams = streams.size();
RTC_CHECK_LE(vc->numberOfSimulcastStreams, num_spatial_layers);
if (vc->numberOfSimulcastStreams < num_spatial_layers) {
vc->SetScalabilityMode(LimitNumSpatialLayers(*vc->GetScalabilityMode(),
vc->numberOfSimulcastStreams));
}
for (int i = 0; i < vc->numberOfSimulcastStreams; ++i) {
SimulcastStream* ss = &vc->simulcastStream[i];
ss->width = streams[i].width;
ss->height = streams[i].height;
ss->numberOfTemporalLayers = num_temporal_layers;
ss->maxBitrate = streams[i].max_bitrate_bps / 1000;
ss->targetBitrate = streams[i].target_bitrate_bps / 1000;
ss->minBitrate = streams[i].min_bitrate_bps / 1000;
ss->qpMax = vc->qpMax;
ss->active = true;
}
}
void SetDefaultCodecSpecificSettings(VideoCodec* vc, int num_temporal_layers) {
switch (vc->codecType) {
case kVideoCodecVP8:
*(vc->VP8()) = VideoEncoder::GetDefaultVp8Settings();
vc->VP8()->SetNumberOfTemporalLayers(num_temporal_layers);
break;
case kVideoCodecVP9: {
*(vc->VP9()) = VideoEncoder::GetDefaultVp9Settings();
vc->VP9()->SetNumberOfTemporalLayers(num_temporal_layers);
} break;
case kVideoCodecH264: {
*(vc->H264()) = VideoEncoder::GetDefaultH264Settings();
vc->H264()->SetNumberOfTemporalLayers(num_temporal_layers);
} break;
case kVideoCodecAV1:
case kVideoCodecH265:
break;
case kVideoCodecGeneric:
RTC_CHECK_NOTREACHED();
}
}
std::tuple<std::vector<DataRate>, ScalabilityMode>
SplitBitrateAndUpdateScalabilityMode(const Environment& env,
std::string codec_type,
ScalabilityMode scalability_mode,
int width,
int height,
std::vector<DataRate> layer_bitrate,
Frequency framerate,
VideoCodecMode content_type) {
int num_spatial_layers = ScalabilityModeToNumSpatialLayers(scalability_mode);
int num_temporal_layers =
ScalabilityModeToNumTemporalLayers(scalability_mode);
int num_bitrates = static_cast<int>(layer_bitrate.size());
RTC_CHECK(num_bitrates == 1 || num_bitrates == num_spatial_layers ||
num_bitrates == num_spatial_layers * num_temporal_layers);
if (num_bitrates == num_spatial_layers * num_temporal_layers) {
return std::make_tuple(layer_bitrate, scalability_mode);
}
DataRate total_bitrate = std::accumulate(
layer_bitrate.begin(), layer_bitrate.end(), DataRate::Zero());
VideoCodec vc;
vc.codecType = PayloadStringToCodecType(codec_type);
vc.width = width;
vc.height = height;
vc.startBitrate = total_bitrate.kbps();
vc.maxBitrate = total_bitrate.kbps();
vc.minBitrate = 0;
vc.maxFramerate = framerate.hertz();
vc.numberOfSimulcastStreams = 0;
vc.mode = content_type;
vc.SetScalabilityMode(scalability_mode);
SetDefaultCodecSpecificSettings(&vc, num_temporal_layers);
if (num_bitrates == num_spatial_layers) {
switch (vc.codecType) {
case kVideoCodecVP8:
case kVideoCodecH264:
case kVideoCodecH265:
vc.numberOfSimulcastStreams = num_spatial_layers;
for (int sidx = 0; sidx < num_spatial_layers; ++sidx) {
SimulcastStream* ss = &vc.simulcastStream[sidx];
ss->width = width >> (num_spatial_layers - sidx - 1);
ss->height = height >> (num_spatial_layers - sidx - 1);
ss->maxFramerate = vc.maxFramerate;
ss->numberOfTemporalLayers = num_temporal_layers;
ss->maxBitrate = layer_bitrate[sidx].kbps();
ss->targetBitrate = layer_bitrate[sidx].kbps();
ss->minBitrate = 0;
ss->qpMax = 0;
ss->active = true;
}
break;
case kVideoCodecVP9:
case kVideoCodecAV1:
for (int sidx = num_spatial_layers - 1; sidx >= 0; --sidx) {
SpatialLayer* ss = &vc.spatialLayers[sidx];
ss->width = width >> (num_spatial_layers - sidx - 1);
ss->height = height >> (num_spatial_layers - sidx - 1);
ss->maxFramerate = vc.maxFramerate;
ss->numberOfTemporalLayers = num_temporal_layers;
ss->maxBitrate = layer_bitrate[sidx].kbps();
ss->targetBitrate = layer_bitrate[sidx].kbps();
ss->minBitrate = 0;
ss->qpMax = 0;
ss->active = true;
}
break;
case kVideoCodecGeneric:
RTC_CHECK_NOTREACHED();
}
} else {
switch (vc.codecType) {
case kVideoCodecVP8:
case kVideoCodecH264:
case kVideoCodecH265:
ConfigureSimulcast(env.field_trials(), &vc);
break;
case kVideoCodecVP9: {
const std::vector<SpatialLayer> spatialLayers = GetVp9SvcConfig(vc);
for (size_t i = 0; i < spatialLayers.size(); ++i) {
vc.spatialLayers[i] = spatialLayers[i];
vc.spatialLayers[i].active = true;
}
} break;
case kVideoCodecAV1: {
bool result =
SetAv1SvcConfig(vc, num_spatial_layers, num_temporal_layers);
RTC_CHECK(result) << "SetAv1SvcConfig failed";
} break;
case kVideoCodecGeneric:
RTC_CHECK_NOTREACHED();
}
if (*vc.GetScalabilityMode() != scalability_mode) {
RTC_LOG(LS_WARNING) << "Scalability mode changed from "
<< ScalabilityModeToString(scalability_mode) << " to "
<< ScalabilityModeToString(*vc.GetScalabilityMode());
num_spatial_layers =
ScalabilityModeToNumSpatialLayers(*vc.GetScalabilityMode());
num_temporal_layers =
ScalabilityModeToNumTemporalLayers(*vc.GetScalabilityMode());
}
}
std::unique_ptr<VideoBitrateAllocator> bitrate_allocator =
CreateBuiltinVideoBitrateAllocatorFactory()->Create(env, vc);
VideoBitrateAllocation bitrate_allocation =
bitrate_allocator->Allocate(VideoBitrateAllocationParameters(
total_bitrate.bps(), framerate.hertz<double>()));
std::vector<DataRate> bitrates;
for (int sidx = 0; sidx < num_spatial_layers; ++sidx) {
for (int tidx = 0; tidx < num_temporal_layers; ++tidx) {
int bitrate_bps = bitrate_allocation.GetBitrate(sidx, tidx);
bitrates.push_back(DataRate::BitsPerSec(bitrate_bps));
}
}
return std::make_tuple(bitrates, *vc.GetScalabilityMode());
}
} // namespace
void VideoCodecStats::Stream::LogMetrics(
MetricsLogger* logger,
std::string test_case_name,
std::string prefix,
std::map<std::string, std::string> metadata) const {
logger->LogMetric(prefix + "width", test_case_name, width, Unit::kCount,
ImprovementDirection::kBiggerIsBetter, metadata);
logger->LogMetric(prefix + "height", test_case_name, height, Unit::kCount,
ImprovementDirection::kBiggerIsBetter, metadata);
logger->LogMetric(prefix + "frame_size_bytes", test_case_name,
frame_size_bytes, Unit::kBytes,
ImprovementDirection::kNeitherIsBetter, metadata);
logger->LogMetric(prefix + "keyframe", test_case_name, keyframe, Unit::kCount,
ImprovementDirection::kSmallerIsBetter, metadata);
logger->LogMetric(prefix + "qp", test_case_name, qp, Unit::kUnitless,
ImprovementDirection::kSmallerIsBetter, metadata);
// TODO(webrtc:14852): Change to us or even ns.
logger->LogMetric(prefix + "encode_time_ms", test_case_name, encode_time_ms,
Unit::kMilliseconds, ImprovementDirection::kSmallerIsBetter,
metadata);
logger->LogMetric(prefix + "decode_time_ms", test_case_name, decode_time_ms,
Unit::kMilliseconds, ImprovementDirection::kSmallerIsBetter,
metadata);
// TODO(webrtc:14852): Change to kUnitLess. kKilobitsPerSecond are converted
// to bytes per second in Chromeperf dash.
logger->LogMetric(prefix + "target_bitrate_kbps", test_case_name,
target_bitrate_kbps, Unit::kKilobitsPerSecond,
ImprovementDirection::kBiggerIsBetter, metadata);
logger->LogMetric(prefix + "target_framerate_fps", test_case_name,
target_framerate_fps, Unit::kHertz,
ImprovementDirection::kBiggerIsBetter, metadata);
// TODO(webrtc:14852): Change to kUnitLess. kKilobitsPerSecond are converted
// to bytes per second in Chromeperf dash.
logger->LogMetric(prefix + "encoded_bitrate_kbps", test_case_name,
encoded_bitrate_kbps, Unit::kKilobitsPerSecond,
ImprovementDirection::kBiggerIsBetter, metadata);
logger->LogMetric(prefix + "encoded_framerate_fps", test_case_name,
encoded_framerate_fps, Unit::kHertz,
ImprovementDirection::kBiggerIsBetter, metadata);
logger->LogMetric(prefix + "bitrate_mismatch_pct", test_case_name,
bitrate_mismatch_pct, Unit::kPercent,
ImprovementDirection::kNeitherIsBetter, metadata);
logger->LogMetric(prefix + "framerate_mismatch_pct", test_case_name,
framerate_mismatch_pct, Unit::kPercent,
ImprovementDirection::kNeitherIsBetter, metadata);
logger->LogMetric(prefix + "transmission_time_ms", test_case_name,
transmission_time_ms, Unit::kMilliseconds,
ImprovementDirection::kSmallerIsBetter, metadata);
logger->LogMetric(prefix + "psnr_y_db", test_case_name, psnr.y,
Unit::kUnitless, ImprovementDirection::kBiggerIsBetter,
metadata);
logger->LogMetric(prefix + "psnr_u_db", test_case_name, psnr.u,
Unit::kUnitless, ImprovementDirection::kBiggerIsBetter,
metadata);
logger->LogMetric(prefix + "psnr_v_db", test_case_name, psnr.v,
Unit::kUnitless, ImprovementDirection::kBiggerIsBetter,
metadata);
}
EncodingSettings VideoCodecTester::CreateEncodingSettings(
const Environment& env,
std::string codec_type,
std::string scalability_name,
int width,
int height,
std::vector<DataRate> bitrate,
Frequency framerate,
bool screencast,
bool frame_drop) {
VideoCodecMode content_type = screencast ? VideoCodecMode::kScreensharing
: VideoCodecMode::kRealtimeVideo;
auto [adjusted_bitrate, scalability_mode] =
SplitBitrateAndUpdateScalabilityMode(
env, codec_type, *ScalabilityModeFromString(scalability_name), width,
height, bitrate, framerate, content_type);
int num_spatial_layers = ScalabilityModeToNumSpatialLayers(scalability_mode);
int num_temporal_layers =
ScalabilityModeToNumTemporalLayers(scalability_mode);
std::map<LayerId, LayerSettings> layers_settings;
for (int sidx = 0; sidx < num_spatial_layers; ++sidx) {
int layer_width = width >> (num_spatial_layers - sidx - 1);
int layer_height = height >> (num_spatial_layers - sidx - 1);
for (int tidx = 0; tidx < num_temporal_layers; ++tidx) {
layers_settings.emplace(
LayerId{.spatial_idx = sidx, .temporal_idx = tidx},
LayerSettings{
.resolution = {.width = layer_width, .height = layer_height},
.framerate = framerate / (1 << (num_temporal_layers - tidx - 1)),
.bitrate = adjusted_bitrate[sidx * num_temporal_layers + tidx]});
}
}
SdpVideoFormat sdp_video_format = SdpVideoFormat(codec_type);
if (codec_type == "H264") {
const std::string packetization_mode =
"1"; // H264PacketizationMode::SingleNalUnit
sdp_video_format.parameters =
CreateH264Format(H264Profile::kProfileConstrainedBaseline,
H264Level::kLevel3_1, packetization_mode,
/*add_scalability_modes=*/false)
.parameters;
}
return EncodingSettings{.sdp_video_format = sdp_video_format,
.scalability_mode = scalability_mode,
.content_type = content_type,
.frame_drop = frame_drop,
.layers_settings = layers_settings};
}
std::map<uint32_t, EncodingSettings> VideoCodecTester::CreateFrameSettings(
const EncodingSettings& encoding_settings,
int num_frames,
uint32_t timestamp_rtp) {
std::map<uint32_t, EncodingSettings> frame_settings;
Frequency framerate =
encoding_settings.layers_settings.rbegin()->second.framerate;
for (int frame_num = 0; frame_num < num_frames; ++frame_num) {
frame_settings.emplace(timestamp_rtp, encoding_settings);
timestamp_rtp += k90kHz / framerate;
}
return frame_settings;
}
std::unique_ptr<VideoCodecTester::VideoCodecStats>
VideoCodecTester::RunDecodeTest(const Environment& env,
CodedVideoSource* video_source,
VideoDecoderFactory* decoder_factory,
const DecoderSettings& decoder_settings,
const SdpVideoFormat& sdp_video_format) {
std::unique_ptr<VideoCodecAnalyzer> analyzer =
std::make_unique<VideoCodecAnalyzer>();
Decoder decoder(env, decoder_factory, decoder_settings, analyzer.get());
decoder.Initialize(sdp_video_format);
while (auto frame = video_source->PullFrame()) {
decoder.Decode(*frame);
}
decoder.Flush();
analyzer->Flush();
return std::move(analyzer);
}
std::unique_ptr<VideoCodecTester::VideoCodecStats>
VideoCodecTester::RunEncodeTest(
const Environment& env,
const VideoSourceSettings& source_settings,
VideoEncoderFactory* encoder_factory,
const EncoderSettings& encoder_settings,
const std::map<uint32_t, EncodingSettings>& encoding_settings) {
VideoSource video_source(source_settings);
std::unique_ptr<VideoCodecAnalyzer> analyzer =
std::make_unique<VideoCodecAnalyzer>();
Encoder encoder(env, encoder_factory, encoder_settings, analyzer.get());
encoder.Initialize(encoding_settings.begin()->second);
for (const auto& [timestamp_rtp, frame_settings] : encoding_settings) {
const EncodingSettings::LayerSettings& top_layer =
frame_settings.layers_settings.rbegin()->second;
VideoFrame source_frame = video_source.PullFrame(
timestamp_rtp, top_layer.resolution, top_layer.framerate);
encoder.Encode(source_frame, frame_settings,
[](const EncodedImage& encoded_frame) {});
}
encoder.Flush();
analyzer->Flush();
return std::move(analyzer);
}
std::unique_ptr<VideoCodecTester::VideoCodecStats>
VideoCodecTester::RunEncodeDecodeTest(
const Environment& env,
const VideoSourceSettings& source_settings,
VideoEncoderFactory* encoder_factory,
VideoDecoderFactory* decoder_factory,
const EncoderSettings& encoder_settings,
const DecoderSettings& decoder_settings,
const std::map<uint32_t, EncodingSettings>& encoding_settings) {
VideoSource video_source(source_settings);
std::unique_ptr<VideoCodecAnalyzer> analyzer =
std::make_unique<VideoCodecAnalyzer>();
const EncodingSettings& frame_settings = encoding_settings.begin()->second;
Encoder encoder(env, encoder_factory, encoder_settings, analyzer.get());
encoder.Initialize(frame_settings);
int num_spatial_layers =
ScalabilityModeToNumSpatialLayers(frame_settings.scalability_mode);
std::vector<std::unique_ptr<Decoder>> decoders;
for (int sidx = 0; sidx < num_spatial_layers; ++sidx) {
auto decoder = std::make_unique<Decoder>(env, decoder_factory,
decoder_settings, analyzer.get());
decoder->Initialize(frame_settings.sdp_video_format);
decoders.push_back(std::move(decoder));
}
for (const auto& [timestamp_rtp, frame_settings] : encoding_settings) {
const EncodingSettings::LayerSettings& top_layer =
frame_settings.layers_settings.rbegin()->second;
VideoFrame source_frame = video_source.PullFrame(
timestamp_rtp, top_layer.resolution, top_layer.framerate);
encoder.Encode(source_frame, frame_settings,
[&decoders,
source_frame](const EncodedImage& encoded_frame) {
int sidx = encoded_frame.SpatialIndex().value_or(
encoded_frame.SimulcastIndex().value_or(0));
decoders.at(sidx)->Decode(encoded_frame, source_frame);
});
}
encoder.Flush();
for (auto& decoder : decoders) {
decoder->Flush();
}
analyzer->Flush();
return std::move(analyzer);
}
} // namespace test
} // namespace webrtc