Video: add new metric for VP9/AV1 hw encoding with softwareBRC
Record the RMSE of encoding bitrate diff from output stream to target bitrate set by WebRTC when the AV1/VP9 stream is removed. Design doc: https://docs.google.com/document/d/1tE7Fquj1U6CwZ01QxxjoCaJS2o0LFYyIxvstLDx0qB0/edit#heading=h.c11ebhaja9tg Bug: chromium:1358750 Change-Id: Ifa6f5aacfa8f6b0835f4609f102ae3ae1ee2897e Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/298684 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39907}
This commit is contained in:
yingyingma
WebRTC LUCI CQ
parent
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commit
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AUTHORS
1
AUTHORS
@ -133,6 +133,7 @@ Yura Yaroshevich <yura.yaroshevich@gmail.com>
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Yuriy Pavlyshak <yuriy@appear.in>
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Yusuke Suzuki <utatane.tea@gmail.com>
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Pengfei Han <hanpfei@gmail.com>
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Yingying Ma <yingying.ma@intel.com>
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# END individuals section.
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# BEGIN organizations section.
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@ -47,7 +47,9 @@ EncoderBitrateAdjuster::EncoderBitrateAdjuster(const VideoCodec& codec_settings)
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: utilize_bandwidth_headroom_(RateControlSettings::ParseFromFieldTrials()
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.BitrateAdjusterCanUseNetworkHeadroom()),
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frames_since_layout_change_(0),
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min_bitrates_bps_{} {
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min_bitrates_bps_{},
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codec_(codec_settings.codecType),
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codec_mode_(codec_settings.mode) {
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// TODO(https://crbug.com/webrtc/14891): If we want to support simulcast of
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// SVC streams, EncoderBitrateAdjuster needs to be updated to care about both
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// `simulcastStream` and `spatialLayers` at the same time.
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@ -90,7 +92,9 @@ VideoBitrateAllocation EncoderBitrateAdjuster::AdjustRateAllocation(
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++active_tls[si];
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if (!overshoot_detectors_[si][ti]) {
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overshoot_detectors_[si][ti] =
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std::make_unique<EncoderOvershootDetector>(kWindowSizeMs);
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std::make_unique<EncoderOvershootDetector>(
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kWindowSizeMs, codec_,
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codec_mode_ == VideoCodecMode::kScreensharing);
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frames_since_layout_change_ = 0;
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}
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} else if (overshoot_detectors_[si][ti]) {
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@ -73,6 +73,12 @@ class EncoderBitrateAdjuster {
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// Minimum bitrates allowed, per spatial layer.
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uint32_t min_bitrates_bps_[kMaxSpatialLayers];
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// Codec type used for encoding.
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VideoCodecType codec_;
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// Codec mode: { kRealtimeVideo, kScreensharing }.
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VideoCodecMode codec_mode_;
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};
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} // namespace webrtc
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@ -11,6 +11,9 @@
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#include "video/encoder_overshoot_detector.h"
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#include <algorithm>
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#include <string>
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#include "system_wrappers/include/metrics.h"
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namespace webrtc {
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namespace {
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@ -20,7 +23,9 @@ namespace {
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static constexpr double kMaxMediaUnderrunFrames = 5.0;
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} // namespace
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EncoderOvershootDetector::EncoderOvershootDetector(int64_t window_size_ms)
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EncoderOvershootDetector::EncoderOvershootDetector(int64_t window_size_ms,
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VideoCodecType codec,
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bool is_screenshare)
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: window_size_ms_(window_size_ms),
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time_last_update_ms_(-1),
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sum_network_utilization_factors_(0.0),
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@ -28,9 +33,16 @@ EncoderOvershootDetector::EncoderOvershootDetector(int64_t window_size_ms)
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target_bitrate_(DataRate::Zero()),
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target_framerate_fps_(0),
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network_buffer_level_bits_(0),
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media_buffer_level_bits_(0) {}
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media_buffer_level_bits_(0),
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codec_(codec),
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is_screenshare_(is_screenshare),
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frame_count_(0),
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sum_diff_kbps_squared_(0),
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sum_overshoot_percent_(0) {}
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EncoderOvershootDetector::~EncoderOvershootDetector() = default;
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EncoderOvershootDetector::~EncoderOvershootDetector() {
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UpdateHistograms();
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}
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void EncoderOvershootDetector::SetTargetRate(DataRate target_bitrate,
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double target_framerate_fps,
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@ -57,6 +69,7 @@ void EncoderOvershootDetector::OnEncodedFrame(size_t bytes, int64_t time_ms) {
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// bitrate.
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LeakBits(time_ms);
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const int64_t frame_size_bits = bytes * 8;
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// Ideal size of a frame given the current rates.
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const int64_t ideal_frame_size_bits = IdealFrameSizeBits();
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if (ideal_frame_size_bits == 0) {
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@ -64,14 +77,22 @@ void EncoderOvershootDetector::OnEncodedFrame(size_t bytes, int64_t time_ms) {
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return;
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}
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const double network_utilization_factor = HandleEncodedFrame(
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bytes * 8, ideal_frame_size_bits, time_ms, &network_buffer_level_bits_);
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const double media_utilization_factor = HandleEncodedFrame(
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bytes * 8, ideal_frame_size_bits, time_ms, &media_buffer_level_bits_);
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const double network_utilization_factor =
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HandleEncodedFrame(frame_size_bits, ideal_frame_size_bits, time_ms,
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&network_buffer_level_bits_);
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const double media_utilization_factor =
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HandleEncodedFrame(frame_size_bits, ideal_frame_size_bits, time_ms,
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&media_buffer_level_bits_);
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sum_network_utilization_factors_ += network_utilization_factor;
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sum_media_utilization_factors_ += media_utilization_factor;
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// Calculate the bitrate diff in kbps
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int64_t diff_kbits = (frame_size_bits - ideal_frame_size_bits) / 1000;
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sum_diff_kbps_squared_ += diff_kbits * diff_kbits;
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sum_overshoot_percent_ += diff_kbits * 100 * 1000 / ideal_frame_size_bits;
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++frame_count_;
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utilization_factors_.emplace_back(network_utilization_factor,
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media_utilization_factor, time_ms);
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}
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@ -142,6 +163,10 @@ absl::optional<double> EncoderOvershootDetector::GetMediaRateUtilizationFactor(
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}
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void EncoderOvershootDetector::Reset() {
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UpdateHistograms();
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sum_diff_kbps_squared_ = 0;
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frame_count_ = 0;
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sum_overshoot_percent_ = 0;
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time_last_update_ms_ = -1;
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utilization_factors_.clear();
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target_bitrate_ = DataRate::Zero();
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@ -201,4 +226,50 @@ void EncoderOvershootDetector::CullOldUpdates(int64_t time_ms) {
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}
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}
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void EncoderOvershootDetector::UpdateHistograms() {
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if (frame_count_ == 0)
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return;
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int64_t bitrate_rmse = std::sqrt(sum_diff_kbps_squared_ / frame_count_);
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int64_t average_overshoot_percent = sum_overshoot_percent_ / frame_count_;
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const std::string rmse_histogram_prefix =
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is_screenshare_ ? "WebRTC.Video.Screenshare.RMSEOfEncodingBitrateInKbps."
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: "WebRTC.Video.RMSEOfEncodingBitrateInKbps.";
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const std::string overshoot_histogram_prefix =
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is_screenshare_ ? "WebRTC.Video.Screenshare.EncodingBitrateOvershoot."
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: "WebRTC.Video.EncodingBitrateOvershoot.";
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// index = 1 represents screensharing histograms recording.
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// index = 0 represents normal video histograms recording.
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const int index = is_screenshare_ ? 1 : 0;
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switch (codec_) {
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case VideoCodecType::kVideoCodecAV1:
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RTC_HISTOGRAMS_COUNTS_10000(index, rmse_histogram_prefix + "Av1",
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bitrate_rmse);
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RTC_HISTOGRAMS_COUNTS_10000(index, overshoot_histogram_prefix + "Av1",
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average_overshoot_percent);
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break;
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case VideoCodecType::kVideoCodecVP9:
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RTC_HISTOGRAMS_COUNTS_10000(index, rmse_histogram_prefix + "Vp9",
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bitrate_rmse);
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RTC_HISTOGRAMS_COUNTS_10000(index, overshoot_histogram_prefix + "Vp9",
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average_overshoot_percent);
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break;
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case VideoCodecType::kVideoCodecVP8:
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RTC_HISTOGRAMS_COUNTS_10000(index, rmse_histogram_prefix + "Vp8",
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bitrate_rmse);
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RTC_HISTOGRAMS_COUNTS_10000(index, overshoot_histogram_prefix + "Vp8",
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average_overshoot_percent);
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break;
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case VideoCodecType::kVideoCodecH264:
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RTC_HISTOGRAMS_COUNTS_10000(index, rmse_histogram_prefix + "H264",
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bitrate_rmse);
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RTC_HISTOGRAMS_COUNTS_10000(index, overshoot_histogram_prefix + "H264",
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average_overshoot_percent);
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break;
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case VideoCodecType::kVideoCodecGeneric:
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case VideoCodecType::kVideoCodecMultiplex:
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break;
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}
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}
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} // namespace webrtc
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@ -15,12 +15,15 @@
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#include "absl/types/optional.h"
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#include "api/units/data_rate.h"
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#include "api/video_codecs/video_codec.h"
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namespace webrtc {
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class EncoderOvershootDetector {
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public:
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explicit EncoderOvershootDetector(int64_t window_size_ms);
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explicit EncoderOvershootDetector(int64_t window_size_ms,
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VideoCodecType codec,
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bool is_screenshare);
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~EncoderOvershootDetector();
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void SetTargetRate(DataRate target_bitrate,
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@ -64,6 +67,7 @@ class EncoderOvershootDetector {
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double media_utilization_factor;
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int64_t update_time_ms;
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};
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void UpdateHistograms();
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std::deque<BitrateUpdate> utilization_factors_;
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double sum_network_utilization_factors_;
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double sum_media_utilization_factors_;
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@ -71,6 +75,11 @@ class EncoderOvershootDetector {
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double target_framerate_fps_;
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int64_t network_buffer_level_bits_;
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int64_t media_buffer_level_bits_;
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VideoCodecType codec_;
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bool is_screenshare_;
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int64_t frame_count_;
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int64_t sum_diff_kbps_squared_;
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int64_t sum_overshoot_percent_;
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};
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} // namespace webrtc
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@ -10,23 +10,58 @@
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#include "video/encoder_overshoot_detector.h"
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#include <string>
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#include "api/units/data_rate.h"
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#include "rtc_base/fake_clock.h"
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#include "rtc_base/time_utils.h"
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#include "system_wrappers/include/metrics.h"
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#include "test/gtest.h"
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namespace webrtc {
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class EncoderOvershootDetectorTest : public ::testing::Test {
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namespace {
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using ::testing::TestWithParam;
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using ::testing::ValuesIn;
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static std::string CodecTypeToHistogramSuffix(VideoCodecType codec) {
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switch (codec) {
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case kVideoCodecVP8:
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return "Vp8";
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case kVideoCodecVP9:
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return "Vp9";
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case kVideoCodecAV1:
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return "Av1";
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case kVideoCodecH264:
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return "H264";
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case kVideoCodecGeneric:
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return "Generic";
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case kVideoCodecMultiplex:
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return "Multiplex";
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}
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}
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struct TestParams {
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VideoCodecType codec_type;
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bool is_screenshare;
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};
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} // namespace
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class EncoderOvershootDetectorTest : public TestWithParam<TestParams> {
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public:
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static constexpr int kDefaultBitrateBps = 300000;
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static constexpr double kDefaultFrameRateFps = 15;
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EncoderOvershootDetectorTest()
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: detector_(kWindowSizeMs),
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: detector_(kWindowSizeMs,
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GetParam().codec_type,
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GetParam().is_screenshare),
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target_bitrate_(DataRate::BitsPerSec(kDefaultBitrateBps)),
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target_framerate_fps_(kDefaultFrameRateFps) {}
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protected:
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void SetUp() override { metrics::Reset(); }
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void RunConstantUtilizationTest(double actual_utilization_factor,
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double expected_utilization_factor,
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double allowed_error,
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@ -70,7 +105,7 @@ class EncoderOvershootDetectorTest : public ::testing::Test {
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double target_framerate_fps_;
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};
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TEST_F(EncoderOvershootDetectorTest, NoUtilizationIfNoRate) {
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TEST_P(EncoderOvershootDetectorTest, NoUtilizationIfNoRate) {
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const int frame_size_bytes = 1000;
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const int64_t time_interval_ms = 33;
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detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
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@ -86,26 +121,26 @@ TEST_F(EncoderOvershootDetectorTest, NoUtilizationIfNoRate) {
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detector_.GetNetworkRateUtilizationFactor(rtc::TimeMillis()).has_value());
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}
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TEST_F(EncoderOvershootDetectorTest, OptimalSize) {
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TEST_P(EncoderOvershootDetectorTest, OptimalSize) {
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// Optimally behaved encoder.
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// Allow some error margin due to rounding errors, eg due to frame
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// interval not being an integer.
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RunConstantUtilizationTest(1.0, 1.0, 0.01, kWindowSizeMs);
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}
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TEST_F(EncoderOvershootDetectorTest, Undershoot) {
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TEST_P(EncoderOvershootDetectorTest, Undershoot) {
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// Undershoot, reported utilization factor should be capped to 1.0 so
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// that we don't incorrectly boost encoder bitrate during movement.
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RunConstantUtilizationTest(0.5, 1.0, 0.00, kWindowSizeMs);
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}
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TEST_F(EncoderOvershootDetectorTest, Overshoot) {
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TEST_P(EncoderOvershootDetectorTest, Overshoot) {
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// Overshoot by 20%.
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// Allow some error margin due to rounding errors.
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RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs);
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}
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TEST_F(EncoderOvershootDetectorTest, ConstantOvershootVaryingRates) {
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TEST_P(EncoderOvershootDetectorTest, ConstantOvershootVaryingRates) {
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// Overshoot by 20%, but vary framerate and bitrate.
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// Allow some error margin due to rounding errors.
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RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs);
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@ -115,7 +150,7 @@ TEST_F(EncoderOvershootDetectorTest, ConstantOvershootVaryingRates) {
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RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs / 2);
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}
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TEST_F(EncoderOvershootDetectorTest, ConstantRateVaryingOvershoot) {
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TEST_P(EncoderOvershootDetectorTest, ConstantRateVaryingOvershoot) {
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// Overshoot by 10%, keep framerate and bitrate constant.
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// Allow some error margin due to rounding errors.
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RunConstantUtilizationTest(1.1, 1.1, 0.01, kWindowSizeMs);
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@ -127,7 +162,7 @@ TEST_F(EncoderOvershootDetectorTest, ConstantRateVaryingOvershoot) {
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RunConstantUtilizationTest(1.2, 1.2, 0.01, kWindowSizeMs / 2);
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}
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TEST_F(EncoderOvershootDetectorTest, PartialOvershoot) {
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TEST_P(EncoderOvershootDetectorTest, PartialOvershoot) {
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const int ideal_frame_size_bytes =
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(target_bitrate_.bps() / target_framerate_fps_) / 8;
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detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
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@ -163,4 +198,83 @@ TEST_F(EncoderOvershootDetectorTest, PartialOvershoot) {
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detector_.GetMediaRateUtilizationFactor(rtc::TimeMillis());
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EXPECT_NEAR(media_utilization_factor.value_or(-1), 1.00, 0.01);
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}
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TEST_P(EncoderOvershootDetectorTest, RecordsZeroErrorMetricWithNoOvershoot) {
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DataSize ideal_frame_size =
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target_bitrate_ / Frequency::Hertz(target_framerate_fps_);
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detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
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rtc::TimeMillis());
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detector_.OnEncodedFrame(ideal_frame_size.bytes(), rtc::TimeMillis());
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detector_.Reset();
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const VideoCodecType codec = GetParam().codec_type;
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const bool is_screenshare = GetParam().is_screenshare;
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const std::string rmse_histogram_prefix =
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is_screenshare ? "WebRTC.Video.Screenshare.RMSEOfEncodingBitrateInKbps."
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: "WebRTC.Video.RMSEOfEncodingBitrateInKbps.";
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const std::string overshoot_histogram_prefix =
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is_screenshare ? "WebRTC.Video.Screenshare.EncodingBitrateOvershoot."
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: "WebRTC.Video.EncodingBitrateOvershoot.";
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// RMSE and overshoot percent = 0, since we used ideal frame size.
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EXPECT_METRIC_EQ(1, metrics::NumSamples(rmse_histogram_prefix +
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CodecTypeToHistogramSuffix(codec)));
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EXPECT_METRIC_EQ(
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1, metrics::NumEvents(
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rmse_histogram_prefix + CodecTypeToHistogramSuffix(codec), 0));
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EXPECT_METRIC_EQ(1, metrics::NumSamples(overshoot_histogram_prefix +
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CodecTypeToHistogramSuffix(codec)));
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EXPECT_METRIC_EQ(1, metrics::NumEvents(overshoot_histogram_prefix +
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CodecTypeToHistogramSuffix(codec),
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0));
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}
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TEST_P(EncoderOvershootDetectorTest,
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RecordScreenshareZeroMetricWithNoOvershoot) {
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DataSize ideal_frame_size =
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target_bitrate_ / Frequency::Hertz(target_framerate_fps_);
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// Use target frame size with 50% overshoot.
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DataSize target_frame_size = ideal_frame_size * 3 / 2;
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detector_.SetTargetRate(target_bitrate_, target_framerate_fps_,
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rtc::TimeMillis());
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detector_.OnEncodedFrame(target_frame_size.bytes(), rtc::TimeMillis());
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detector_.Reset();
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const VideoCodecType codec = GetParam().codec_type;
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const bool is_screenshare = GetParam().is_screenshare;
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const std::string rmse_histogram_prefix =
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is_screenshare ? "WebRTC.Video.Screenshare.RMSEOfEncodingBitrateInKbps."
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: "WebRTC.Video.RMSEOfEncodingBitrateInKbps.";
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const std::string overshoot_histogram_prefix =
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is_screenshare ? "WebRTC.Video.Screenshare.EncodingBitrateOvershoot."
|
||||
: "WebRTC.Video.EncodingBitrateOvershoot.";
|
||||
// Use ideal_frame_size_kbits to represnt ideal_frame_size.bytes()*8/1000,
|
||||
// then rmse_in_kbps = ideal_frame_size_kbits/2
|
||||
// since we use target frame size with 50% overshoot.
|
||||
int64_t rmse_in_kbps = ideal_frame_size.bytes() * 8 / 1000 / 2;
|
||||
EXPECT_METRIC_EQ(1, metrics::NumSamples(rmse_histogram_prefix +
|
||||
CodecTypeToHistogramSuffix(codec)));
|
||||
EXPECT_METRIC_EQ(1, metrics::NumEvents(rmse_histogram_prefix +
|
||||
CodecTypeToHistogramSuffix(codec),
|
||||
rmse_in_kbps));
|
||||
// overshoot percent = 50, since we used ideal_frame_size * 3 / 2;
|
||||
EXPECT_METRIC_EQ(1, metrics::NumSamples(overshoot_histogram_prefix +
|
||||
CodecTypeToHistogramSuffix(codec)));
|
||||
EXPECT_METRIC_EQ(1, metrics::NumEvents(overshoot_histogram_prefix +
|
||||
CodecTypeToHistogramSuffix(codec),
|
||||
50));
|
||||
}
|
||||
|
||||
INSTANTIATE_TEST_SUITE_P(
|
||||
PerCodecType,
|
||||
EncoderOvershootDetectorTest,
|
||||
ValuesIn<TestParams>({{VideoCodecType::kVideoCodecVP8, false},
|
||||
{VideoCodecType::kVideoCodecVP8, true},
|
||||
{VideoCodecType::kVideoCodecVP9, false},
|
||||
{VideoCodecType::kVideoCodecVP9, true},
|
||||
{VideoCodecType::kVideoCodecAV1, false},
|
||||
{VideoCodecType::kVideoCodecAV1, true},
|
||||
{VideoCodecType::kVideoCodecH264, false},
|
||||
{VideoCodecType::kVideoCodecH264, true}}));
|
||||
|
||||
} // namespace webrtc
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user