Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1512 insertions, 0 deletions

diff --git a/third_party/libwebrtc/video/send_statistics_proxy.cc b/third_party/libwebrtc/video/send_statistics_proxy.cc
new file mode 100644
index 0000000000..b6c2d60a73
--- /dev/null
+++ b/third_party/libwebrtc/video/send_statistics_proxy.cc
@@ -0,0 +1,1512 @@
+/*
+ *  Copyright (c) 2013 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 "video/send_statistics_proxy.h"
+
+#include <algorithm>
+#include <array>
+#include <cmath>
+#include <limits>
+#include <utility>
+
+#include "absl/strings/match.h"
+#include "api/video/video_codec_constants.h"
+#include "api/video/video_codec_type.h"
+#include "api/video_codecs/video_codec.h"
+#include "modules/video_coding/include/video_codec_interface.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/numerics/mod_ops.h"
+#include "rtc_base/strings/string_builder.h"
+#include "system_wrappers/include/metrics.h"
+
+namespace webrtc {
+namespace {
+const float kEncodeTimeWeigthFactor = 0.5f;
+const size_t kMaxEncodedFrameMapSize = 150;
+const int64_t kMaxEncodedFrameWindowMs = 800;
+const uint32_t kMaxEncodedFrameTimestampDiff = 900000;  // 10 sec.
+const int64_t kBucketSizeMs = 100;
+const size_t kBucketCount = 10;
+
+const char kVp8ForcedFallbackEncoderFieldTrial[] =
+    "WebRTC-VP8-Forced-Fallback-Encoder-v2";
+const char kVp8SwCodecName[] = "libvpx";
+
+// Used by histograms. Values of entries should not be changed.
+enum HistogramCodecType {
+  kVideoUnknown = 0,
+  kVideoVp8 = 1,
+  kVideoVp9 = 2,
+  kVideoH264 = 3,
+  kVideoAv1 = 4,
+  kVideoMax = 64,
+};
+
+const char* kRealtimePrefix = "WebRTC.Video.";
+const char* kScreenPrefix = "WebRTC.Video.Screenshare.";
+
+const char* GetUmaPrefix(VideoEncoderConfig::ContentType content_type) {
+  switch (content_type) {
+    case VideoEncoderConfig::ContentType::kRealtimeVideo:
+      return kRealtimePrefix;
+    case VideoEncoderConfig::ContentType::kScreen:
+      return kScreenPrefix;
+  }
+  RTC_DCHECK_NOTREACHED();
+  return nullptr;
+}
+
+HistogramCodecType PayloadNameToHistogramCodecType(
+    const std::string& payload_name) {
+  VideoCodecType codecType = PayloadStringToCodecType(payload_name);
+  switch (codecType) {
+    case kVideoCodecVP8:
+      return kVideoVp8;
+    case kVideoCodecVP9:
+      return kVideoVp9;
+    case kVideoCodecH264:
+      return kVideoH264;
+    case kVideoCodecAV1:
+      return kVideoAv1;
+    default:
+      return kVideoUnknown;
+  }
+}
+
+void UpdateCodecTypeHistogram(const std::string& payload_name) {
+  RTC_HISTOGRAM_ENUMERATION("WebRTC.Video.Encoder.CodecType",
+                            PayloadNameToHistogramCodecType(payload_name),
+                            kVideoMax);
+}
+
+bool IsForcedFallbackPossible(const CodecSpecificInfo* codec_info,
+                              int simulcast_index) {
+  return codec_info->codecType == kVideoCodecVP8 && simulcast_index == 0 &&
+         (codec_info->codecSpecific.VP8.temporalIdx == 0 ||
+          codec_info->codecSpecific.VP8.temporalIdx == kNoTemporalIdx);
+}
+
+absl::optional<int> GetFallbackMaxPixels(const std::string& group) {
+  if (group.empty())
+    return absl::nullopt;
+
+  int min_pixels;
+  int max_pixels;
+  int min_bps;
+  if (sscanf(group.c_str(), "-%d,%d,%d", &min_pixels, &max_pixels, &min_bps) !=
+      3) {
+    return absl::optional<int>();
+  }
+
+  if (min_pixels <= 0 || max_pixels <= 0 || max_pixels < min_pixels)
+    return absl::optional<int>();
+
+  return absl::optional<int>(max_pixels);
+}
+
+absl::optional<int> GetFallbackMaxPixelsIfFieldTrialEnabled(
+    const webrtc::FieldTrialsView& field_trials) {
+  std::string group = field_trials.Lookup(kVp8ForcedFallbackEncoderFieldTrial);
+  return (absl::StartsWith(group, "Enabled"))
+             ? GetFallbackMaxPixels(group.substr(7))
+             : absl::optional<int>();
+}
+
+absl::optional<int> GetFallbackMaxPixelsIfFieldTrialDisabled(
+    const webrtc::FieldTrialsView& field_trials) {
+  std::string group = field_trials.Lookup(kVp8ForcedFallbackEncoderFieldTrial);
+  return (absl::StartsWith(group, "Disabled"))
+             ? GetFallbackMaxPixels(group.substr(8))
+             : absl::optional<int>();
+}
+}  // namespace
+
+const int SendStatisticsProxy::kStatsTimeoutMs = 5000;
+
+SendStatisticsProxy::SendStatisticsProxy(
+    Clock* clock,
+    const VideoSendStream::Config& config,
+    VideoEncoderConfig::ContentType content_type,
+    const FieldTrialsView& field_trials)
+    : clock_(clock),
+      payload_name_(config.rtp.payload_name),
+      rtp_config_(config.rtp),
+      fallback_max_pixels_(
+          GetFallbackMaxPixelsIfFieldTrialEnabled(field_trials)),
+      fallback_max_pixels_disabled_(
+          GetFallbackMaxPixelsIfFieldTrialDisabled(field_trials)),
+      content_type_(content_type),
+      start_ms_(clock->TimeInMilliseconds()),
+      encode_time_(kEncodeTimeWeigthFactor),
+      quality_limitation_reason_tracker_(clock_),
+      media_byte_rate_tracker_(kBucketSizeMs, kBucketCount),
+      encoded_frame_rate_tracker_(kBucketSizeMs, kBucketCount),
+      last_num_spatial_layers_(0),
+      last_num_simulcast_streams_(0),
+      last_spatial_layer_use_{},
+      bw_limited_layers_(false),
+      internal_encoder_scaler_(false),
+      uma_container_(
+          new UmaSamplesContainer(GetUmaPrefix(content_type_), stats_, clock)) {
+}
+
+SendStatisticsProxy::~SendStatisticsProxy() {
+  MutexLock lock(&mutex_);
+  uma_container_->UpdateHistograms(rtp_config_, stats_);
+
+  int64_t elapsed_sec = (clock_->TimeInMilliseconds() - start_ms_) / 1000;
+  RTC_HISTOGRAM_COUNTS_100000("WebRTC.Video.SendStreamLifetimeInSeconds",
+                              elapsed_sec);
+
+  if (elapsed_sec >= metrics::kMinRunTimeInSeconds)
+    UpdateCodecTypeHistogram(payload_name_);
+}
+
+SendStatisticsProxy::FallbackEncoderInfo::FallbackEncoderInfo() = default;
+
+SendStatisticsProxy::UmaSamplesContainer::UmaSamplesContainer(
+    const char* prefix,
+    const VideoSendStream::Stats& stats,
+    Clock* const clock)
+    : uma_prefix_(prefix),
+      clock_(clock),
+      input_frame_rate_tracker_(100, 10u),
+      input_fps_counter_(clock, nullptr, true),
+      sent_fps_counter_(clock, nullptr, true),
+      total_byte_counter_(clock, nullptr, true),
+      media_byte_counter_(clock, nullptr, true),
+      rtx_byte_counter_(clock, nullptr, true),
+      padding_byte_counter_(clock, nullptr, true),
+      retransmit_byte_counter_(clock, nullptr, true),
+      fec_byte_counter_(clock, nullptr, true),
+      first_rtcp_stats_time_ms_(-1),
+      first_rtp_stats_time_ms_(-1),
+      start_stats_(stats),
+      num_streams_(0),
+      num_pixels_highest_stream_(0) {
+  InitializeBitrateCounters(stats);
+  static_assert(
+      kMaxEncodedFrameTimestampDiff < std::numeric_limits<uint32_t>::max() / 2,
+      "has to be smaller than half range");
+}
+
+SendStatisticsProxy::UmaSamplesContainer::~UmaSamplesContainer() {}
+
+void SendStatisticsProxy::UmaSamplesContainer::InitializeBitrateCounters(
+    const VideoSendStream::Stats& stats) {
+  for (const auto& it : stats.substreams) {
+    uint32_t ssrc = it.first;
+    total_byte_counter_.SetLast(it.second.rtp_stats.transmitted.TotalBytes(),
+                                ssrc);
+    padding_byte_counter_.SetLast(it.second.rtp_stats.transmitted.padding_bytes,
+                                  ssrc);
+    retransmit_byte_counter_.SetLast(
+        it.second.rtp_stats.retransmitted.TotalBytes(), ssrc);
+    fec_byte_counter_.SetLast(it.second.rtp_stats.fec.TotalBytes(), ssrc);
+    switch (it.second.type) {
+      case VideoSendStream::StreamStats::StreamType::kMedia:
+        media_byte_counter_.SetLast(it.second.rtp_stats.MediaPayloadBytes(),
+                                    ssrc);
+        break;
+      case VideoSendStream::StreamStats::StreamType::kRtx:
+        rtx_byte_counter_.SetLast(it.second.rtp_stats.transmitted.TotalBytes(),
+                                  ssrc);
+        break;
+      case VideoSendStream::StreamStats::StreamType::kFlexfec:
+        break;
+    }
+  }
+}
+
+void SendStatisticsProxy::UmaSamplesContainer::RemoveOld(int64_t now_ms) {
+  while (!encoded_frames_.empty()) {
+    auto it = encoded_frames_.begin();
+    if (now_ms - it->second.send_ms < kMaxEncodedFrameWindowMs)
+      break;
+
+    // Use max per timestamp.
+    sent_width_counter_.Add(it->second.max_width);
+    sent_height_counter_.Add(it->second.max_height);
+
+    // Check number of encoded streams per timestamp.
+    if (num_streams_ > static_cast<size_t>(it->second.max_simulcast_idx)) {
+      if (num_streams_ > 1) {
+        int disabled_streams =
+            static_cast<int>(num_streams_ - 1 - it->second.max_simulcast_idx);
+        // Can be limited in resolution or framerate.
+        uint32_t pixels = it->second.max_width * it->second.max_height;
+        bool bw_limited_resolution =
+            disabled_streams > 0 && pixels < num_pixels_highest_stream_;
+        bw_limited_frame_counter_.Add(bw_limited_resolution);
+        if (bw_limited_resolution) {
+          bw_resolutions_disabled_counter_.Add(disabled_streams);
+        }
+      }
+    }
+    encoded_frames_.erase(it);
+  }
+}
+
+bool SendStatisticsProxy::UmaSamplesContainer::InsertEncodedFrame(
+    const EncodedImage& encoded_frame,
+    int simulcast_idx) {
+  int64_t now_ms = clock_->TimeInMilliseconds();
+  RemoveOld(now_ms);
+  if (encoded_frames_.size() > kMaxEncodedFrameMapSize) {
+    encoded_frames_.clear();
+  }
+
+  // Check for jump in timestamp.
+  if (!encoded_frames_.empty()) {
+    uint32_t oldest_timestamp = encoded_frames_.begin()->first;
+    if (ForwardDiff(oldest_timestamp, encoded_frame.Timestamp()) >
+        kMaxEncodedFrameTimestampDiff) {
+      // Gap detected, clear frames to have a sequence where newest timestamp
+      // is not too far away from oldest in order to distinguish old and new.
+      encoded_frames_.clear();
+    }
+  }
+
+  auto it = encoded_frames_.find(encoded_frame.Timestamp());
+  if (it == encoded_frames_.end()) {
+    // First frame with this timestamp.
+    encoded_frames_.insert(
+        std::make_pair(encoded_frame.Timestamp(),
+                       Frame(now_ms, encoded_frame._encodedWidth,
+                             encoded_frame._encodedHeight, simulcast_idx)));
+    sent_fps_counter_.Add(1);
+    return true;
+  }
+
+  it->second.max_width =
+      std::max(it->second.max_width, encoded_frame._encodedWidth);
+  it->second.max_height =
+      std::max(it->second.max_height, encoded_frame._encodedHeight);
+  it->second.max_simulcast_idx =
+      std::max(it->second.max_simulcast_idx, simulcast_idx);
+  return false;
+}
+
+void SendStatisticsProxy::UmaSamplesContainer::UpdateHistograms(
+    const RtpConfig& rtp_config,
+    const VideoSendStream::Stats& current_stats) {
+  RTC_DCHECK(uma_prefix_ == kRealtimePrefix || uma_prefix_ == kScreenPrefix);
+  const int kIndex = uma_prefix_ == kScreenPrefix ? 1 : 0;
+  const int kMinRequiredPeriodicSamples = 6;
+  char log_stream_buf[8 * 1024];
+  rtc::SimpleStringBuilder log_stream(log_stream_buf);
+  int in_width = input_width_counter_.Avg(kMinRequiredMetricsSamples);
+  int in_height = input_height_counter_.Avg(kMinRequiredMetricsSamples);
+  if (in_width != -1) {
+    RTC_HISTOGRAMS_COUNTS_10000(kIndex, uma_prefix_ + "InputWidthInPixels",
+                                in_width);
+    RTC_HISTOGRAMS_COUNTS_10000(kIndex, uma_prefix_ + "InputHeightInPixels",
+                                in_height);
+    log_stream << uma_prefix_ << "InputWidthInPixels " << in_width << "\n"
+               << uma_prefix_ << "InputHeightInPixels " << in_height << "\n";
+  }
+  AggregatedStats in_fps = input_fps_counter_.GetStats();
+  if (in_fps.num_samples >= kMinRequiredPeriodicSamples) {
+    RTC_HISTOGRAMS_COUNTS_100(kIndex, uma_prefix_ + "InputFramesPerSecond",
+                              in_fps.average);
+    log_stream << uma_prefix_ << "InputFramesPerSecond " << in_fps.ToString()
+               << "\n";
+  }
+
+  int sent_width = sent_width_counter_.Avg(kMinRequiredMetricsSamples);
+  int sent_height = sent_height_counter_.Avg(kMinRequiredMetricsSamples);
+  if (sent_width != -1) {
+    RTC_HISTOGRAMS_COUNTS_10000(kIndex, uma_prefix_ + "SentWidthInPixels",
+                                sent_width);
+    RTC_HISTOGRAMS_COUNTS_10000(kIndex, uma_prefix_ + "SentHeightInPixels",
+                                sent_height);
+    log_stream << uma_prefix_ << "SentWidthInPixels " << sent_width << "\n"
+               << uma_prefix_ << "SentHeightInPixels " << sent_height << "\n";
+  }
+  AggregatedStats sent_fps = sent_fps_counter_.GetStats();
+  if (sent_fps.num_samples >= kMinRequiredPeriodicSamples) {
+    RTC_HISTOGRAMS_COUNTS_100(kIndex, uma_prefix_ + "SentFramesPerSecond",
+                              sent_fps.average);
+    log_stream << uma_prefix_ << "SentFramesPerSecond " << sent_fps.ToString()
+               << "\n";
+  }
+
+  if (in_fps.num_samples > kMinRequiredPeriodicSamples &&
+      sent_fps.num_samples >= kMinRequiredPeriodicSamples) {
+    int in_fps_avg = in_fps.average;
+    if (in_fps_avg > 0) {
+      int sent_fps_avg = sent_fps.average;
+      int sent_to_in_fps_ratio_percent =
+          (100 * sent_fps_avg + in_fps_avg / 2) / in_fps_avg;
+      // If reported period is small, it may happen that sent_fps is larger than
+      // input_fps briefly on average. This should be treated as 100% sent to
+      // input ratio.
+      if (sent_to_in_fps_ratio_percent > 100)
+        sent_to_in_fps_ratio_percent = 100;
+      RTC_HISTOGRAMS_PERCENTAGE(kIndex,
+                                uma_prefix_ + "SentToInputFpsRatioPercent",
+                                sent_to_in_fps_ratio_percent);
+      log_stream << uma_prefix_ << "SentToInputFpsRatioPercent "
+                 << sent_to_in_fps_ratio_percent << "\n";
+    }
+  }
+
+  int encode_ms = encode_time_counter_.Avg(kMinRequiredMetricsSamples);
+  if (encode_ms != -1) {
+    RTC_HISTOGRAMS_COUNTS_1000(kIndex, uma_prefix_ + "EncodeTimeInMs",
+                               encode_ms);
+    log_stream << uma_prefix_ << "EncodeTimeInMs " << encode_ms << "\n";
+  }
+  int key_frames_permille =
+      key_frame_counter_.Permille(kMinRequiredMetricsSamples);
+  if (key_frames_permille != -1) {
+    RTC_HISTOGRAMS_COUNTS_1000(kIndex, uma_prefix_ + "KeyFramesSentInPermille",
+                               key_frames_permille);
+    log_stream << uma_prefix_ << "KeyFramesSentInPermille "
+               << key_frames_permille << "\n";
+  }
+  int quality_limited =
+      quality_limited_frame_counter_.Percent(kMinRequiredMetricsSamples);
+  if (quality_limited != -1) {
+    RTC_HISTOGRAMS_PERCENTAGE(kIndex,
+                              uma_prefix_ + "QualityLimitedResolutionInPercent",
+                              quality_limited);
+    log_stream << uma_prefix_ << "QualityLimitedResolutionInPercent "
+               << quality_limited << "\n";
+  }
+  int downscales = quality_downscales_counter_.Avg(kMinRequiredMetricsSamples);
+  if (downscales != -1) {
+    RTC_HISTOGRAMS_ENUMERATION(
+        kIndex, uma_prefix_ + "QualityLimitedResolutionDownscales", downscales,
+        20);
+  }
+  int cpu_limited =
+      cpu_limited_frame_counter_.Percent(kMinRequiredMetricsSamples);
+  if (cpu_limited != -1) {
+    RTC_HISTOGRAMS_PERCENTAGE(
+        kIndex, uma_prefix_ + "CpuLimitedResolutionInPercent", cpu_limited);
+  }
+  int bw_limited =
+      bw_limited_frame_counter_.Percent(kMinRequiredMetricsSamples);
+  if (bw_limited != -1) {
+    RTC_HISTOGRAMS_PERCENTAGE(
+        kIndex, uma_prefix_ + "BandwidthLimitedResolutionInPercent",
+        bw_limited);
+  }
+  int num_disabled =
+      bw_resolutions_disabled_counter_.Avg(kMinRequiredMetricsSamples);
+  if (num_disabled != -1) {
+    RTC_HISTOGRAMS_ENUMERATION(
+        kIndex, uma_prefix_ + "BandwidthLimitedResolutionsDisabled",
+        num_disabled, 10);
+  }
+  int delay_ms = delay_counter_.Avg(kMinRequiredMetricsSamples);
+  if (delay_ms != -1)
+    RTC_HISTOGRAMS_COUNTS_100000(kIndex, uma_prefix_ + "SendSideDelayInMs",
+                                 delay_ms);
+
+  int max_delay_ms = max_delay_counter_.Avg(kMinRequiredMetricsSamples);
+  if (max_delay_ms != -1) {
+    RTC_HISTOGRAMS_COUNTS_100000(kIndex, uma_prefix_ + "SendSideDelayMaxInMs",
+                                 max_delay_ms);
+  }
+
+  for (const auto& it : qp_counters_) {
+    int qp_vp8 = it.second.vp8.Avg(kMinRequiredMetricsSamples);
+    if (qp_vp8 != -1) {
+      int spatial_idx = it.first;
+      if (spatial_idx == -1) {
+        RTC_HISTOGRAMS_COUNTS_200(kIndex, uma_prefix_ + "Encoded.Qp.Vp8",
+                                  qp_vp8);
+      } else if (spatial_idx == 0) {
+        RTC_HISTOGRAMS_COUNTS_200(kIndex, uma_prefix_ + "Encoded.Qp.Vp8.S0",
+                                  qp_vp8);
+      } else if (spatial_idx == 1) {
+        RTC_HISTOGRAMS_COUNTS_200(kIndex, uma_prefix_ + "Encoded.Qp.Vp8.S1",
+                                  qp_vp8);
+      } else if (spatial_idx == 2) {
+        RTC_HISTOGRAMS_COUNTS_200(kIndex, uma_prefix_ + "Encoded.Qp.Vp8.S2",
+                                  qp_vp8);
+      } else {
+        RTC_LOG(LS_WARNING)
+            << "QP stats not recorded for VP8 spatial idx " << spatial_idx;
+      }
+    }
+    int qp_vp9 = it.second.vp9.Avg(kMinRequiredMetricsSamples);
+    if (qp_vp9 != -1) {
+      int spatial_idx = it.first;
+      if (spatial_idx == -1) {
+        RTC_HISTOGRAMS_COUNTS_500(kIndex, uma_prefix_ + "Encoded.Qp.Vp9",
+                                  qp_vp9);
+      } else if (spatial_idx == 0) {
+        RTC_HISTOGRAMS_COUNTS_500(kIndex, uma_prefix_ + "Encoded.Qp.Vp9.S0",
+                                  qp_vp9);
+      } else if (spatial_idx == 1) {
+        RTC_HISTOGRAMS_COUNTS_500(kIndex, uma_prefix_ + "Encoded.Qp.Vp9.S1",
+                                  qp_vp9);
+      } else if (spatial_idx == 2) {
+        RTC_HISTOGRAMS_COUNTS_500(kIndex, uma_prefix_ + "Encoded.Qp.Vp9.S2",
+                                  qp_vp9);
+      } else {
+        RTC_LOG(LS_WARNING)
+            << "QP stats not recorded for VP9 spatial layer " << spatial_idx;
+      }
+    }
+    int qp_h264 = it.second.h264.Avg(kMinRequiredMetricsSamples);
+    if (qp_h264 != -1) {
+      int spatial_idx = it.first;
+      if (spatial_idx == -1) {
+        RTC_HISTOGRAMS_COUNTS_200(kIndex, uma_prefix_ + "Encoded.Qp.H264",
+                                  qp_h264);
+      } else if (spatial_idx == 0) {
+        RTC_HISTOGRAMS_COUNTS_200(kIndex, uma_prefix_ + "Encoded.Qp.H264.S0",
+                                  qp_h264);
+      } else if (spatial_idx == 1) {
+        RTC_HISTOGRAMS_COUNTS_200(kIndex, uma_prefix_ + "Encoded.Qp.H264.S1",
+                                  qp_h264);
+      } else if (spatial_idx == 2) {
+        RTC_HISTOGRAMS_COUNTS_200(kIndex, uma_prefix_ + "Encoded.Qp.H264.S2",
+                                  qp_h264);
+      } else {
+        RTC_LOG(LS_WARNING)
+            << "QP stats not recorded for H264 spatial idx " << spatial_idx;
+      }
+    }
+  }
+
+  if (first_rtp_stats_time_ms_ != -1) {
+    quality_adapt_timer_.Stop(clock_->TimeInMilliseconds());
+    int64_t elapsed_sec = quality_adapt_timer_.total_ms / 1000;
+    if (elapsed_sec >= metrics::kMinRunTimeInSeconds) {
+      int quality_changes = current_stats.number_of_quality_adapt_changes -
+                            start_stats_.number_of_quality_adapt_changes;
+      // Only base stats on changes during a call, discard initial changes.
+      int initial_changes =
+          initial_quality_changes_.down + initial_quality_changes_.up;
+      if (initial_changes <= quality_changes)
+        quality_changes -= initial_changes;
+      RTC_HISTOGRAMS_COUNTS_100(kIndex,
+                                uma_prefix_ + "AdaptChangesPerMinute.Quality",
+                                quality_changes * 60 / elapsed_sec);
+    }
+    cpu_adapt_timer_.Stop(clock_->TimeInMilliseconds());
+    elapsed_sec = cpu_adapt_timer_.total_ms / 1000;
+    if (elapsed_sec >= metrics::kMinRunTimeInSeconds) {
+      int cpu_changes = current_stats.number_of_cpu_adapt_changes -
+                        start_stats_.number_of_cpu_adapt_changes;
+      RTC_HISTOGRAMS_COUNTS_100(kIndex,
+                                uma_prefix_ + "AdaptChangesPerMinute.Cpu",
+                                cpu_changes * 60 / elapsed_sec);
+    }
+  }
+
+  if (first_rtcp_stats_time_ms_ != -1) {
+    int64_t elapsed_sec =
+        (clock_->TimeInMilliseconds() - first_rtcp_stats_time_ms_) / 1000;
+    if (elapsed_sec >= metrics::kMinRunTimeInSeconds) {
+      int fraction_lost = report_block_stats_.FractionLostInPercent();
+      if (fraction_lost != -1) {
+        RTC_HISTOGRAMS_PERCENTAGE(
+            kIndex, uma_prefix_ + "SentPacketsLostInPercent", fraction_lost);
+        log_stream << uma_prefix_ << "SentPacketsLostInPercent "
+                   << fraction_lost << "\n";
+      }
+
+      // The RTCP packet type counters, delivered via the
+      // RtcpPacketTypeCounterObserver interface, are aggregates over the entire
+      // life of the send stream and are not reset when switching content type.
+      // For the purpose of these statistics though, we want new counts when
+      // switching since we switch histogram name. On every reset of the
+      // UmaSamplesContainer, we save the initial state of the counters, so that
+      // we can calculate the delta here and aggregate over all ssrcs.
+      RtcpPacketTypeCounter counters;
+      for (uint32_t ssrc : rtp_config.ssrcs) {
+        auto kv = current_stats.substreams.find(ssrc);
+        if (kv == current_stats.substreams.end())
+          continue;
+
+        RtcpPacketTypeCounter stream_counters =
+            kv->second.rtcp_packet_type_counts;
+        kv = start_stats_.substreams.find(ssrc);
+        if (kv != start_stats_.substreams.end())
+          stream_counters.Subtract(kv->second.rtcp_packet_type_counts);
+
+        counters.Add(stream_counters);
+      }
+      RTC_HISTOGRAMS_COUNTS_10000(kIndex,
+                                  uma_prefix_ + "NackPacketsReceivedPerMinute",
+                                  counters.nack_packets * 60 / elapsed_sec);
+      RTC_HISTOGRAMS_COUNTS_10000(kIndex,
+                                  uma_prefix_ + "FirPacketsReceivedPerMinute",
+                                  counters.fir_packets * 60 / elapsed_sec);
+      RTC_HISTOGRAMS_COUNTS_10000(kIndex,
+                                  uma_prefix_ + "PliPacketsReceivedPerMinute",
+                                  counters.pli_packets * 60 / elapsed_sec);
+      if (counters.nack_requests > 0) {
+        RTC_HISTOGRAMS_PERCENTAGE(
+            kIndex, uma_prefix_ + "UniqueNackRequestsReceivedInPercent",
+            counters.UniqueNackRequestsInPercent());
+      }
+    }
+  }
+
+  if (first_rtp_stats_time_ms_ != -1) {
+    int64_t elapsed_sec =
+        (clock_->TimeInMilliseconds() - first_rtp_stats_time_ms_) / 1000;
+    if (elapsed_sec >= metrics::kMinRunTimeInSeconds) {
+      RTC_HISTOGRAMS_COUNTS_100(kIndex, uma_prefix_ + "NumberOfPauseEvents",
+                                target_rate_updates_.pause_resume_events);
+      log_stream << uma_prefix_ << "NumberOfPauseEvents "
+                 << target_rate_updates_.pause_resume_events << "\n";
+
+      int paused_time_percent =
+          paused_time_counter_.Percent(metrics::kMinRunTimeInSeconds * 1000);
+      if (paused_time_percent != -1) {
+        RTC_HISTOGRAMS_PERCENTAGE(kIndex, uma_prefix_ + "PausedTimeInPercent",
+                                  paused_time_percent);
+        log_stream << uma_prefix_ << "PausedTimeInPercent "
+                   << paused_time_percent << "\n";
+      }
+    }
+  }
+
+  if (fallback_info_.is_possible) {
+    // Double interval since there is some time before fallback may occur.
+    const int kMinRunTimeMs = 2 * metrics::kMinRunTimeInSeconds * 1000;
+    int64_t elapsed_ms = fallback_info_.elapsed_ms;
+    int fallback_time_percent = fallback_active_counter_.Percent(kMinRunTimeMs);
+    if (fallback_time_percent != -1 && elapsed_ms >= kMinRunTimeMs) {
+      RTC_HISTOGRAMS_PERCENTAGE(
+          kIndex, uma_prefix_ + "Encoder.ForcedSwFallbackTimeInPercent.Vp8",
+          fallback_time_percent);
+      RTC_HISTOGRAMS_COUNTS_100(
+          kIndex, uma_prefix_ + "Encoder.ForcedSwFallbackChangesPerMinute.Vp8",
+          fallback_info_.on_off_events * 60 / (elapsed_ms / 1000));
+    }
+  }
+
+  AggregatedStats total_bytes_per_sec = total_byte_counter_.GetStats();
+  if (total_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
+    RTC_HISTOGRAMS_COUNTS_10000(kIndex, uma_prefix_ + "BitrateSentInKbps",
+                                total_bytes_per_sec.average * 8 / 1000);
+    log_stream << uma_prefix_ << "BitrateSentInBps "
+               << total_bytes_per_sec.ToStringWithMultiplier(8) << "\n";
+  }
+  AggregatedStats media_bytes_per_sec = media_byte_counter_.GetStats();
+  if (media_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
+    RTC_HISTOGRAMS_COUNTS_10000(kIndex, uma_prefix_ + "MediaBitrateSentInKbps",
+                                media_bytes_per_sec.average * 8 / 1000);
+    log_stream << uma_prefix_ << "MediaBitrateSentInBps "
+               << media_bytes_per_sec.ToStringWithMultiplier(8) << "\n";
+  }
+  AggregatedStats padding_bytes_per_sec = padding_byte_counter_.GetStats();
+  if (padding_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
+    RTC_HISTOGRAMS_COUNTS_10000(kIndex,
+                                uma_prefix_ + "PaddingBitrateSentInKbps",
+                                padding_bytes_per_sec.average * 8 / 1000);
+    log_stream << uma_prefix_ << "PaddingBitrateSentInBps "
+               << padding_bytes_per_sec.ToStringWithMultiplier(8) << "\n";
+  }
+  AggregatedStats retransmit_bytes_per_sec =
+      retransmit_byte_counter_.GetStats();
+  if (retransmit_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
+    RTC_HISTOGRAMS_COUNTS_10000(kIndex,
+                                uma_prefix_ + "RetransmittedBitrateSentInKbps",
+                                retransmit_bytes_per_sec.average * 8 / 1000);
+    log_stream << uma_prefix_ << "RetransmittedBitrateSentInBps "
+               << retransmit_bytes_per_sec.ToStringWithMultiplier(8) << "\n";
+  }
+  if (!rtp_config.rtx.ssrcs.empty()) {
+    AggregatedStats rtx_bytes_per_sec = rtx_byte_counter_.GetStats();
+    int rtx_bytes_per_sec_avg = -1;
+    if (rtx_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
+      rtx_bytes_per_sec_avg = rtx_bytes_per_sec.average;
+      log_stream << uma_prefix_ << "RtxBitrateSentInBps "
+                 << rtx_bytes_per_sec.ToStringWithMultiplier(8) << "\n";
+    } else if (total_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
+      rtx_bytes_per_sec_avg = 0;  // RTX enabled but no RTX data sent, record 0.
+    }
+    if (rtx_bytes_per_sec_avg != -1) {
+      RTC_HISTOGRAMS_COUNTS_10000(kIndex, uma_prefix_ + "RtxBitrateSentInKbps",
+                                  rtx_bytes_per_sec_avg * 8 / 1000);
+    }
+  }
+  if (rtp_config.flexfec.payload_type != -1 ||
+      rtp_config.ulpfec.red_payload_type != -1) {
+    AggregatedStats fec_bytes_per_sec = fec_byte_counter_.GetStats();
+    if (fec_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
+      RTC_HISTOGRAMS_COUNTS_10000(kIndex, uma_prefix_ + "FecBitrateSentInKbps",
+                                  fec_bytes_per_sec.average * 8 / 1000);
+      log_stream << uma_prefix_ << "FecBitrateSentInBps "
+                 << fec_bytes_per_sec.ToStringWithMultiplier(8) << "\n";
+    }
+  }
+  log_stream << "Frames encoded " << current_stats.frames_encoded << "\n"
+             << uma_prefix_ << "DroppedFrames.Capturer "
+             << current_stats.frames_dropped_by_capturer << "\n";
+  RTC_HISTOGRAMS_COUNTS_1000(kIndex, uma_prefix_ + "DroppedFrames.Capturer",
+                             current_stats.frames_dropped_by_capturer);
+  log_stream << uma_prefix_ << "DroppedFrames.EncoderQueue "
+             << current_stats.frames_dropped_by_encoder_queue << "\n";
+  RTC_HISTOGRAMS_COUNTS_1000(kIndex, uma_prefix_ + "DroppedFrames.EncoderQueue",
+                             current_stats.frames_dropped_by_encoder_queue);
+  log_stream << uma_prefix_ << "DroppedFrames.Encoder "
+             << current_stats.frames_dropped_by_encoder << "\n";
+  RTC_HISTOGRAMS_COUNTS_1000(kIndex, uma_prefix_ + "DroppedFrames.Encoder",
+                             current_stats.frames_dropped_by_encoder);
+  log_stream << uma_prefix_ << "DroppedFrames.Ratelimiter "
+             << current_stats.frames_dropped_by_rate_limiter << "\n";
+  RTC_HISTOGRAMS_COUNTS_1000(kIndex, uma_prefix_ + "DroppedFrames.Ratelimiter",
+                             current_stats.frames_dropped_by_rate_limiter);
+  log_stream << uma_prefix_ << "DroppedFrames.CongestionWindow "
+             << current_stats.frames_dropped_by_congestion_window;
+
+  RTC_LOG(LS_INFO) << log_stream.str();
+}
+
+void SendStatisticsProxy::OnEncoderReconfigured(
+    const VideoEncoderConfig& config,
+    const std::vector<VideoStream>& streams) {
+  // Called on VideoStreamEncoder's encoder_queue_.
+  MutexLock lock(&mutex_);
+
+  if (content_type_ != config.content_type) {
+    uma_container_->UpdateHistograms(rtp_config_, stats_);
+    uma_container_.reset(new UmaSamplesContainer(
+        GetUmaPrefix(config.content_type), stats_, clock_));
+    content_type_ = config.content_type;
+  }
+  uma_container_->encoded_frames_.clear();
+  uma_container_->num_streams_ = streams.size();
+  uma_container_->num_pixels_highest_stream_ =
+      streams.empty() ? 0 : (streams.back().width * streams.back().height);
+}
+
+void SendStatisticsProxy::OnEncodedFrameTimeMeasured(int encode_time_ms,
+                                                     int encode_usage_percent) {
+  RTC_DCHECK_GE(encode_time_ms, 0);
+  MutexLock lock(&mutex_);
+  uma_container_->encode_time_counter_.Add(encode_time_ms);
+  encode_time_.Apply(1.0f, encode_time_ms);
+  stats_.avg_encode_time_ms = std::round(encode_time_.filtered());
+  stats_.total_encode_time_ms += encode_time_ms;
+  stats_.encode_usage_percent = encode_usage_percent;
+}
+
+void SendStatisticsProxy::OnSuspendChange(bool is_suspended) {
+  int64_t now_ms = clock_->TimeInMilliseconds();
+  MutexLock lock(&mutex_);
+  stats_.suspended = is_suspended;
+  if (is_suspended) {
+    // Pause framerate (add min pause time since there may be frames/packets
+    // that are not yet sent).
+    const int64_t kMinMs = 500;
+    uma_container_->input_fps_counter_.ProcessAndPauseForDuration(kMinMs);
+    uma_container_->sent_fps_counter_.ProcessAndPauseForDuration(kMinMs);
+    // Pause bitrate stats.
+    uma_container_->total_byte_counter_.ProcessAndPauseForDuration(kMinMs);
+    uma_container_->media_byte_counter_.ProcessAndPauseForDuration(kMinMs);
+    uma_container_->rtx_byte_counter_.ProcessAndPauseForDuration(kMinMs);
+    uma_container_->padding_byte_counter_.ProcessAndPauseForDuration(kMinMs);
+    uma_container_->retransmit_byte_counter_.ProcessAndPauseForDuration(kMinMs);
+    uma_container_->fec_byte_counter_.ProcessAndPauseForDuration(kMinMs);
+    // Stop adaptation stats.
+    uma_container_->cpu_adapt_timer_.Stop(now_ms);
+    uma_container_->quality_adapt_timer_.Stop(now_ms);
+  } else {
+    // Start adaptation stats if scaling is enabled.
+    if (adaptation_limitations_.MaskedCpuCounts()
+            .resolution_adaptations.has_value())
+      uma_container_->cpu_adapt_timer_.Start(now_ms);
+    if (adaptation_limitations_.MaskedQualityCounts()
+            .resolution_adaptations.has_value())
+      uma_container_->quality_adapt_timer_.Start(now_ms);
+    // Stop pause explicitly for stats that may be zero/not updated for some
+    // time.
+    uma_container_->rtx_byte_counter_.ProcessAndStopPause();
+    uma_container_->padding_byte_counter_.ProcessAndStopPause();
+    uma_container_->retransmit_byte_counter_.ProcessAndStopPause();
+    uma_container_->fec_byte_counter_.ProcessAndStopPause();
+  }
+}
+
+VideoSendStream::Stats SendStatisticsProxy::GetStats() {
+  MutexLock lock(&mutex_);
+  PurgeOldStats();
+  stats_.input_frame_rate =
+      uma_container_->input_frame_rate_tracker_.ComputeRate();
+  stats_.frames =
+      uma_container_->input_frame_rate_tracker_.TotalSampleCount();
+  stats_.content_type =
+      content_type_ == VideoEncoderConfig::ContentType::kRealtimeVideo
+          ? VideoContentType::UNSPECIFIED
+          : VideoContentType::SCREENSHARE;
+  stats_.encode_frame_rate = round(encoded_frame_rate_tracker_.ComputeRate());
+  stats_.media_bitrate_bps = media_byte_rate_tracker_.ComputeRate() * 8;
+  stats_.quality_limitation_durations_ms =
+      quality_limitation_reason_tracker_.DurationsMs();
+
+  for (auto& substream : stats_.substreams) {
+    uint32_t ssrc = substream.first;
+    if (encoded_frame_rate_trackers_.count(ssrc) > 0) {
+      substream.second.encode_frame_rate =
+          encoded_frame_rate_trackers_[ssrc]->ComputeRate();
+    }
+  }
+  return stats_;
+}
+
+void SendStatisticsProxy::PurgeOldStats() {
+  int64_t old_stats_ms = clock_->TimeInMilliseconds() - kStatsTimeoutMs;
+  for (std::map<uint32_t, VideoSendStream::StreamStats>::iterator it =
+           stats_.substreams.begin();
+       it != stats_.substreams.end(); ++it) {
+    uint32_t ssrc = it->first;
+    if (update_times_[ssrc].resolution_update_ms <= old_stats_ms) {
+      it->second.width = 0;
+      it->second.height = 0;
+    }
+  }
+}
+
+VideoSendStream::StreamStats* SendStatisticsProxy::GetStatsEntry(
+    uint32_t ssrc) {
+  std::map<uint32_t, VideoSendStream::StreamStats>::iterator it =
+      stats_.substreams.find(ssrc);
+  if (it != stats_.substreams.end())
+    return &it->second;
+
+  bool is_media = rtp_config_.IsMediaSsrc(ssrc);
+  bool is_flexfec = rtp_config_.flexfec.payload_type != -1 &&
+                    ssrc == rtp_config_.flexfec.ssrc;
+  bool is_rtx = rtp_config_.IsRtxSsrc(ssrc);
+  if (!is_media && !is_flexfec && !is_rtx)
+    return nullptr;
+
+  // Insert new entry and return ptr.
+  VideoSendStream::StreamStats* entry = &stats_.substreams[ssrc];
+  if (is_media) {
+    entry->type = VideoSendStream::StreamStats::StreamType::kMedia;
+  } else if (is_rtx) {
+    entry->type = VideoSendStream::StreamStats::StreamType::kRtx;
+  } else if (is_flexfec) {
+    entry->type = VideoSendStream::StreamStats::StreamType::kFlexfec;
+  } else {
+    RTC_DCHECK_NOTREACHED();
+  }
+  switch (entry->type) {
+    case VideoSendStream::StreamStats::StreamType::kMedia:
+      break;
+    case VideoSendStream::StreamStats::StreamType::kRtx:
+      entry->referenced_media_ssrc =
+          rtp_config_.GetMediaSsrcAssociatedWithRtxSsrc(ssrc);
+      break;
+    case VideoSendStream::StreamStats::StreamType::kFlexfec:
+      entry->referenced_media_ssrc =
+          rtp_config_.GetMediaSsrcAssociatedWithFlexfecSsrc(ssrc);
+      break;
+  }
+
+  return entry;
+}
+
+void SendStatisticsProxy::OnInactiveSsrc(uint32_t ssrc) {
+  MutexLock lock(&mutex_);
+  VideoSendStream::StreamStats* stats = GetStatsEntry(ssrc);
+  if (!stats)
+    return;
+
+  stats->total_bitrate_bps = 0;
+  stats->retransmit_bitrate_bps = 0;
+  stats->height = 0;
+  stats->width = 0;
+}
+
+void SendStatisticsProxy::OnSetEncoderTargetRate(uint32_t bitrate_bps) {
+  MutexLock lock(&mutex_);
+  if (uma_container_->target_rate_updates_.last_ms == -1 && bitrate_bps == 0)
+    return;  // Start on first non-zero bitrate, may initially be zero.
+
+  int64_t now = clock_->TimeInMilliseconds();
+  if (uma_container_->target_rate_updates_.last_ms != -1) {
+    bool was_paused = stats_.target_media_bitrate_bps == 0;
+    int64_t diff_ms = now - uma_container_->target_rate_updates_.last_ms;
+    uma_container_->paused_time_counter_.Add(was_paused, diff_ms);
+
+    // Use last to not include update when stream is stopped and video disabled.
+    if (uma_container_->target_rate_updates_.last_paused_or_resumed)
+      ++uma_container_->target_rate_updates_.pause_resume_events;
+
+    // Check if video is paused/resumed.
+    uma_container_->target_rate_updates_.last_paused_or_resumed =
+        (bitrate_bps == 0) != was_paused;
+  }
+  uma_container_->target_rate_updates_.last_ms = now;
+
+  stats_.target_media_bitrate_bps = bitrate_bps;
+}
+
+void SendStatisticsProxy::UpdateEncoderFallbackStats(
+    const CodecSpecificInfo* codec_info,
+    int pixels,
+    int simulcast_index) {
+  UpdateFallbackDisabledStats(codec_info, pixels, simulcast_index);
+
+  if (!fallback_max_pixels_ || !uma_container_->fallback_info_.is_possible) {
+    return;
+  }
+
+  if (!IsForcedFallbackPossible(codec_info, simulcast_index)) {
+    uma_container_->fallback_info_.is_possible = false;
+    return;
+  }
+
+  FallbackEncoderInfo* fallback_info = &uma_container_->fallback_info_;
+
+  const int64_t now_ms = clock_->TimeInMilliseconds();
+  bool is_active = fallback_info->is_active;
+  if (encoder_changed_) {
+    // Implementation changed.
+    const bool last_was_vp8_software =
+        encoder_changed_->previous_encoder_implementation == kVp8SwCodecName;
+    is_active = encoder_changed_->new_encoder_implementation == kVp8SwCodecName;
+    encoder_changed_.reset();
+    if (!is_active && !last_was_vp8_software) {
+      // First or not a VP8 SW change, update stats on next call.
+      return;
+    }
+    if (is_active && (pixels > *fallback_max_pixels_)) {
+      // Pixels should not be above `fallback_max_pixels_`. If above skip to
+      // avoid fallbacks due to failure.
+      fallback_info->is_possible = false;
+      return;
+    }
+    stats_.has_entered_low_resolution = true;
+    ++fallback_info->on_off_events;
+  }
+
+  if (fallback_info->last_update_ms) {
+    int64_t diff_ms = now_ms - *(fallback_info->last_update_ms);
+    // If the time diff since last update is greater than `max_frame_diff_ms`,
+    // video is considered paused/muted and the change is not included.
+    if (diff_ms < fallback_info->max_frame_diff_ms) {
+      uma_container_->fallback_active_counter_.Add(fallback_info->is_active,
+                                                   diff_ms);
+      fallback_info->elapsed_ms += diff_ms;
+    }
+  }
+  fallback_info->is_active = is_active;
+  fallback_info->last_update_ms.emplace(now_ms);
+}
+
+void SendStatisticsProxy::UpdateFallbackDisabledStats(
+    const CodecSpecificInfo* codec_info,
+    int pixels,
+    int simulcast_index) {
+  if (!fallback_max_pixels_disabled_ ||
+      !uma_container_->fallback_info_disabled_.is_possible ||
+      stats_.has_entered_low_resolution) {
+    return;
+  }
+
+  if (!IsForcedFallbackPossible(codec_info, simulcast_index) ||
+      stats_.encoder_implementation_name == kVp8SwCodecName) {
+    uma_container_->fallback_info_disabled_.is_possible = false;
+    return;
+  }
+
+  if (pixels <= *fallback_max_pixels_disabled_ ||
+      uma_container_->fallback_info_disabled_.min_pixel_limit_reached) {
+    stats_.has_entered_low_resolution = true;
+  }
+}
+
+void SendStatisticsProxy::OnMinPixelLimitReached() {
+  MutexLock lock(&mutex_);
+  uma_container_->fallback_info_disabled_.min_pixel_limit_reached = true;
+}
+
+void SendStatisticsProxy::OnSendEncodedImage(
+    const EncodedImage& encoded_image,
+    const CodecSpecificInfo* codec_info) {
+  // Simulcast is used for VP8, H264 and Generic.
+  int simulcast_idx =
+      (codec_info && (codec_info->codecType == kVideoCodecVP8 ||
+                      codec_info->codecType == kVideoCodecH264 ||
+                      codec_info->codecType == kVideoCodecGeneric))
+          ? encoded_image.SpatialIndex().value_or(0)
+          : 0;
+
+  MutexLock lock(&mutex_);
+  ++stats_.frames_encoded;
+  // The current encode frame rate is based on previously encoded frames.
+  double encode_frame_rate = encoded_frame_rate_tracker_.ComputeRate();
+  // We assume that less than 1 FPS is not a trustworthy estimate - perhaps we
+  // just started encoding for the first time or after a pause. Assuming frame
+  // rate is at least 1 FPS is conservative to avoid too large increments.
+  if (encode_frame_rate < 1.0)
+    encode_frame_rate = 1.0;
+  double target_frame_size_bytes =
+      stats_.target_media_bitrate_bps / (8.0 * encode_frame_rate);
+  // `stats_.target_media_bitrate_bps` is set in
+  // SendStatisticsProxy::OnSetEncoderTargetRate.
+  stats_.total_encoded_bytes_target += round(target_frame_size_bytes);
+  if (codec_info) {
+    UpdateEncoderFallbackStats(
+        codec_info, encoded_image._encodedWidth * encoded_image._encodedHeight,
+        simulcast_idx);
+  }
+
+  if (static_cast<size_t>(simulcast_idx) >= rtp_config_.ssrcs.size()) {
+    RTC_LOG(LS_ERROR) << "Encoded image outside simulcast range ("
+                      << simulcast_idx << " >= " << rtp_config_.ssrcs.size()
+                      << ").";
+    return;
+  }
+  uint32_t ssrc = rtp_config_.ssrcs[simulcast_idx];
+
+  VideoSendStream::StreamStats* stats = GetStatsEntry(ssrc);
+  if (!stats)
+    return;
+
+  if (encoded_frame_rate_trackers_.count(ssrc) == 0) {
+    encoded_frame_rate_trackers_[ssrc] =
+        std::make_unique<rtc::RateTracker>(kBucketSizeMs, kBucketCount);
+  }
+
+  stats->frames_encoded++;
+  stats->total_encode_time_ms += encoded_image.timing_.encode_finish_ms -
+                                 encoded_image.timing_.encode_start_ms;
+  if (codec_info)
+    stats->scalability_mode = codec_info->scalability_mode;
+  // Report resolution of the top spatial layer.
+  bool is_top_spatial_layer =
+      codec_info == nullptr || codec_info->end_of_picture;
+
+  if (!stats->width || !stats->height || is_top_spatial_layer) {
+    stats->width = encoded_image._encodedWidth;
+    stats->height = encoded_image._encodedHeight;
+    update_times_[ssrc].resolution_update_ms = clock_->TimeInMilliseconds();
+  }
+
+  uma_container_->key_frame_counter_.Add(encoded_image._frameType ==
+                                         VideoFrameType::kVideoFrameKey);
+
+  if (encoded_image.qp_ != -1) {
+    if (!stats->qp_sum)
+      stats->qp_sum = 0;
+    *stats->qp_sum += encoded_image.qp_;
+
+    if (codec_info) {
+      if (codec_info->codecType == kVideoCodecVP8) {
+        int spatial_idx = (rtp_config_.ssrcs.size() == 1) ? -1 : simulcast_idx;
+        uma_container_->qp_counters_[spatial_idx].vp8.Add(encoded_image.qp_);
+      } else if (codec_info->codecType == kVideoCodecVP9) {
+        int spatial_idx = encoded_image.SpatialIndex().value_or(-1);
+        uma_container_->qp_counters_[spatial_idx].vp9.Add(encoded_image.qp_);
+      } else if (codec_info->codecType == kVideoCodecH264) {
+        int spatial_idx = (rtp_config_.ssrcs.size() == 1) ? -1 : simulcast_idx;
+        uma_container_->qp_counters_[spatial_idx].h264.Add(encoded_image.qp_);
+      }
+    }
+  }
+
+  // If any of the simulcast streams have a huge frame, it should be counted
+  // as a single difficult input frame.
+  // https://w3c.github.io/webrtc-stats/#dom-rtcvideosenderstats-hugeframessent
+  if (encoded_image.timing_.flags & VideoSendTiming::kTriggeredBySize) {
+    ++stats->huge_frames_sent;
+    if (!last_outlier_timestamp_ ||
+        *last_outlier_timestamp_ < encoded_image.capture_time_ms_) {
+      last_outlier_timestamp_.emplace(encoded_image.capture_time_ms_);
+      ++stats_.huge_frames_sent;
+    }
+  }
+
+  media_byte_rate_tracker_.AddSamples(encoded_image.size());
+
+  if (uma_container_->InsertEncodedFrame(encoded_image, simulcast_idx)) {
+    // First frame seen with this timestamp, track overall fps.
+    encoded_frame_rate_tracker_.AddSamples(1);
+  }
+  // is_top_spatial_layer pertains only to SVC, will always be true for
+  // simulcast.
+  if (is_top_spatial_layer)
+    encoded_frame_rate_trackers_[ssrc]->AddSamples(1);
+
+  absl::optional<int> downscales =
+      adaptation_limitations_.MaskedQualityCounts().resolution_adaptations;
+  stats_.bw_limited_resolution |=
+      (downscales.has_value() && downscales.value() > 0);
+
+  if (downscales.has_value()) {
+    uma_container_->quality_limited_frame_counter_.Add(downscales.value() > 0);
+    if (downscales.value() > 0)
+      uma_container_->quality_downscales_counter_.Add(downscales.value());
+  }
+}
+
+void SendStatisticsProxy::OnEncoderImplementationChanged(
+    EncoderImplementation implementation) {
+  MutexLock lock(&mutex_);
+  encoder_changed_ = EncoderChangeEvent{stats_.encoder_implementation_name,
+                                        implementation.name};
+  stats_.encoder_implementation_name = implementation.name;
+  stats_.power_efficient_encoder = implementation.is_hardware_accelerated;
+}
+
+int SendStatisticsProxy::GetInputFrameRate() const {
+  MutexLock lock(&mutex_);
+  return round(uma_container_->input_frame_rate_tracker_.ComputeRate());
+}
+
+int SendStatisticsProxy::GetSendFrameRate() const {
+  MutexLock lock(&mutex_);
+  return round(encoded_frame_rate_tracker_.ComputeRate());
+}
+
+void SendStatisticsProxy::OnIncomingFrame(int width, int height) {
+  MutexLock lock(&mutex_);
+  uma_container_->input_frame_rate_tracker_.AddSamples(1);
+  uma_container_->input_fps_counter_.Add(1);
+  uma_container_->input_width_counter_.Add(width);
+  uma_container_->input_height_counter_.Add(height);
+  if (adaptation_limitations_.MaskedCpuCounts()
+          .resolution_adaptations.has_value()) {
+    uma_container_->cpu_limited_frame_counter_.Add(
+        stats_.cpu_limited_resolution);
+  }
+  if (encoded_frame_rate_tracker_.TotalSampleCount() == 0) {
+    // Set start time now instead of when first key frame is encoded to avoid a
+    // too high initial estimate.
+    encoded_frame_rate_tracker_.AddSamples(0);
+  }
+}
+
+void SendStatisticsProxy::OnFrameDropped(DropReason reason) {
+  MutexLock lock(&mutex_);
+  switch (reason) {
+    case DropReason::kSource:
+      ++stats_.frames_dropped_by_capturer;
+      break;
+    case DropReason::kEncoderQueue:
+      ++stats_.frames_dropped_by_encoder_queue;
+      break;
+    case DropReason::kEncoder:
+      ++stats_.frames_dropped_by_encoder;
+      break;
+    case DropReason::kMediaOptimization:
+      ++stats_.frames_dropped_by_rate_limiter;
+      break;
+    case DropReason::kCongestionWindow:
+      ++stats_.frames_dropped_by_congestion_window;
+      break;
+  }
+}
+
+void SendStatisticsProxy::ClearAdaptationStats() {
+  MutexLock lock(&mutex_);
+  adaptation_limitations_.set_cpu_counts(VideoAdaptationCounters());
+  adaptation_limitations_.set_quality_counts(VideoAdaptationCounters());
+  UpdateAdaptationStats();
+}
+
+void SendStatisticsProxy::UpdateAdaptationSettings(
+    VideoStreamEncoderObserver::AdaptationSettings cpu_settings,
+    VideoStreamEncoderObserver::AdaptationSettings quality_settings) {
+  MutexLock lock(&mutex_);
+  adaptation_limitations_.UpdateMaskingSettings(cpu_settings, quality_settings);
+  SetAdaptTimer(adaptation_limitations_.MaskedCpuCounts(),
+                &uma_container_->cpu_adapt_timer_);
+  SetAdaptTimer(adaptation_limitations_.MaskedQualityCounts(),
+                &uma_container_->quality_adapt_timer_);
+  UpdateAdaptationStats();
+}
+
+void SendStatisticsProxy::OnAdaptationChanged(
+    VideoAdaptationReason reason,
+    const VideoAdaptationCounters& cpu_counters,
+    const VideoAdaptationCounters& quality_counters) {
+  MutexLock lock(&mutex_);
+
+  MaskedAdaptationCounts receiver =
+      adaptation_limitations_.MaskedQualityCounts();
+  adaptation_limitations_.set_cpu_counts(cpu_counters);
+  adaptation_limitations_.set_quality_counts(quality_counters);
+  switch (reason) {
+    case VideoAdaptationReason::kCpu:
+      ++stats_.number_of_cpu_adapt_changes;
+      break;
+    case VideoAdaptationReason::kQuality:
+      TryUpdateInitialQualityResolutionAdaptUp(
+          receiver.resolution_adaptations,
+          adaptation_limitations_.MaskedQualityCounts().resolution_adaptations);
+      ++stats_.number_of_quality_adapt_changes;
+      break;
+  }
+  UpdateAdaptationStats();
+}
+
+void SendStatisticsProxy::UpdateAdaptationStats() {
+  auto cpu_counts = adaptation_limitations_.MaskedCpuCounts();
+  auto quality_counts = adaptation_limitations_.MaskedQualityCounts();
+
+  bool is_cpu_limited = cpu_counts.resolution_adaptations > 0 ||
+                        cpu_counts.num_framerate_reductions > 0;
+  bool is_bandwidth_limited = quality_counts.resolution_adaptations > 0 ||
+                              quality_counts.num_framerate_reductions > 0 ||
+                              bw_limited_layers_ || internal_encoder_scaler_;
+  if (is_bandwidth_limited) {
+    // We may be both CPU limited and bandwidth limited at the same time but
+    // there is no way to express this in standardized stats. Heuristically,
+    // bandwidth is more likely to be a limiting factor than CPU, and more
+    // likely to vary over time, so only when we aren't bandwidth limited do we
+    // want to know about our CPU being the bottleneck.
+    quality_limitation_reason_tracker_.SetReason(
+        QualityLimitationReason::kBandwidth);
+  } else if (is_cpu_limited) {
+    quality_limitation_reason_tracker_.SetReason(QualityLimitationReason::kCpu);
+  } else {
+    quality_limitation_reason_tracker_.SetReason(
+        QualityLimitationReason::kNone);
+  }
+
+  stats_.cpu_limited_resolution = cpu_counts.resolution_adaptations > 0;
+  stats_.cpu_limited_framerate = cpu_counts.num_framerate_reductions > 0;
+  stats_.bw_limited_resolution = quality_counts.resolution_adaptations > 0;
+  stats_.bw_limited_framerate = quality_counts.num_framerate_reductions > 0;
+  // If bitrate allocator has disabled some layers frame-rate or resolution are
+  // limited depending on the encoder configuration.
+  if (bw_limited_layers_) {
+    switch (content_type_) {
+      case VideoEncoderConfig::ContentType::kRealtimeVideo: {
+        stats_.bw_limited_resolution = true;
+        break;
+      }
+      case VideoEncoderConfig::ContentType::kScreen: {
+        stats_.bw_limited_framerate = true;
+        break;
+      }
+    }
+  }
+  if (internal_encoder_scaler_) {
+    stats_.bw_limited_resolution = true;
+  }
+
+  stats_.quality_limitation_reason =
+      quality_limitation_reason_tracker_.current_reason();
+
+  // `stats_.quality_limitation_durations_ms` depends on the current time
+  // when it is polled; it is updated in SendStatisticsProxy::GetStats().
+}
+
+void SendStatisticsProxy::OnBitrateAllocationUpdated(
+    const VideoCodec& codec,
+    const VideoBitrateAllocation& allocation) {
+  int num_spatial_layers = 0;
+  for (int i = 0; i < kMaxSpatialLayers; i++) {
+    if (codec.spatialLayers[i].active) {
+      num_spatial_layers++;
+    }
+  }
+  int num_simulcast_streams = 0;
+  for (int i = 0; i < kMaxSimulcastStreams; i++) {
+    if (codec.simulcastStream[i].active) {
+      num_simulcast_streams++;
+    }
+  }
+
+  std::array<bool, kMaxSpatialLayers> spatial_layers;
+  for (int i = 0; i < kMaxSpatialLayers; i++) {
+    spatial_layers[i] = (allocation.GetSpatialLayerSum(i) > 0);
+  }
+
+  MutexLock lock(&mutex_);
+
+  bw_limited_layers_ = allocation.is_bw_limited();
+  UpdateAdaptationStats();
+
+  if (spatial_layers != last_spatial_layer_use_) {
+    // If the number of spatial layers has changed, the resolution change is
+    // not due to quality limitations, it is because the configuration
+    // changed.
+    if (last_num_spatial_layers_ == num_spatial_layers &&
+        last_num_simulcast_streams_ == num_simulcast_streams) {
+      ++stats_.quality_limitation_resolution_changes;
+    }
+    last_spatial_layer_use_ = spatial_layers;
+  }
+  last_num_spatial_layers_ = num_spatial_layers;
+  last_num_simulcast_streams_ = num_simulcast_streams;
+}
+
+// Informes observer if an internal encoder scaler has reduced video
+// resolution or not. `is_scaled` is a flag indicating if the video is scaled
+// down.
+void SendStatisticsProxy::OnEncoderInternalScalerUpdate(bool is_scaled) {
+  MutexLock lock(&mutex_);
+  internal_encoder_scaler_ = is_scaled;
+  UpdateAdaptationStats();
+}
+
+// TODO(asapersson): Include fps changes.
+void SendStatisticsProxy::OnInitialQualityResolutionAdaptDown() {
+  MutexLock lock(&mutex_);
+  ++uma_container_->initial_quality_changes_.down;
+}
+
+void SendStatisticsProxy::TryUpdateInitialQualityResolutionAdaptUp(
+    absl::optional<int> old_quality_downscales,
+    absl::optional<int> updated_quality_downscales) {
+  if (uma_container_->initial_quality_changes_.down == 0)
+    return;
+
+  if (old_quality_downscales.has_value() &&
+      old_quality_downscales.value() > 0 &&
+      updated_quality_downscales.value_or(-1) <
+          old_quality_downscales.value()) {
+    // Adapting up in quality.
+    if (uma_container_->initial_quality_changes_.down >
+        uma_container_->initial_quality_changes_.up) {
+      ++uma_container_->initial_quality_changes_.up;
+    }
+  }
+}
+
+void SendStatisticsProxy::SetAdaptTimer(const MaskedAdaptationCounts& counts,
+                                        StatsTimer* timer) {
+  if (counts.resolution_adaptations || counts.num_framerate_reductions) {
+    // Adaptation enabled.
+    if (!stats_.suspended)
+      timer->Start(clock_->TimeInMilliseconds());
+    return;
+  }
+  timer->Stop(clock_->TimeInMilliseconds());
+}
+
+void SendStatisticsProxy::RtcpPacketTypesCounterUpdated(
+    uint32_t ssrc,
+    const RtcpPacketTypeCounter& packet_counter) {
+  MutexLock lock(&mutex_);
+  VideoSendStream::StreamStats* stats = GetStatsEntry(ssrc);
+  if (!stats)
+    return;
+
+  stats->rtcp_packet_type_counts = packet_counter;
+  if (uma_container_->first_rtcp_stats_time_ms_ == -1)
+    uma_container_->first_rtcp_stats_time_ms_ = clock_->TimeInMilliseconds();
+}
+
+void SendStatisticsProxy::OnReportBlockDataUpdated(
+    ReportBlockData report_block_data) {
+  MutexLock lock(&mutex_);
+  VideoSendStream::StreamStats* stats =
+      GetStatsEntry(report_block_data.report_block().source_ssrc);
+  if (!stats)
+    return;
+  const RTCPReportBlock& report_block = report_block_data.report_block();
+  uma_container_->report_block_stats_.Store(
+      /*ssrc=*/report_block.source_ssrc,
+      /*packets_lost=*/report_block.packets_lost,
+      /*extended_highest_sequence_number=*/
+      report_block.extended_highest_sequence_number);
+
+  stats->report_block_data = std::move(report_block_data);
+}
+
+void SendStatisticsProxy::DataCountersUpdated(
+    const StreamDataCounters& counters,
+    uint32_t ssrc) {
+  MutexLock lock(&mutex_);
+  VideoSendStream::StreamStats* stats = GetStatsEntry(ssrc);
+  RTC_DCHECK(stats) << "DataCountersUpdated reported for unknown ssrc " << ssrc;
+
+  if (stats->type == VideoSendStream::StreamStats::StreamType::kFlexfec) {
+    // The same counters are reported for both the media ssrc and flexfec ssrc.
+    // Bitrate stats are summed for all SSRCs. Use fec stats from media update.
+    return;
+  }
+
+  stats->rtp_stats = counters;
+  if (uma_container_->first_rtp_stats_time_ms_ == -1) {
+    int64_t now_ms = clock_->TimeInMilliseconds();
+    uma_container_->first_rtp_stats_time_ms_ = now_ms;
+    uma_container_->cpu_adapt_timer_.Restart(now_ms);
+    uma_container_->quality_adapt_timer_.Restart(now_ms);
+  }
+
+  uma_container_->total_byte_counter_.Set(counters.transmitted.TotalBytes(),
+                                          ssrc);
+  uma_container_->padding_byte_counter_.Set(counters.transmitted.padding_bytes,
+                                            ssrc);
+  uma_container_->retransmit_byte_counter_.Set(
+      counters.retransmitted.TotalBytes(), ssrc);
+  uma_container_->fec_byte_counter_.Set(counters.fec.TotalBytes(), ssrc);
+  switch (stats->type) {
+    case VideoSendStream::StreamStats::StreamType::kMedia:
+      uma_container_->media_byte_counter_.Set(counters.MediaPayloadBytes(),
+                                              ssrc);
+      break;
+    case VideoSendStream::StreamStats::StreamType::kRtx:
+      uma_container_->rtx_byte_counter_.Set(counters.transmitted.TotalBytes(),
+                                            ssrc);
+      break;
+    case VideoSendStream::StreamStats::StreamType::kFlexfec:
+      break;
+  }
+}
+
+void SendStatisticsProxy::Notify(uint32_t total_bitrate_bps,
+                                 uint32_t retransmit_bitrate_bps,
+                                 uint32_t ssrc) {
+  MutexLock lock(&mutex_);
+  VideoSendStream::StreamStats* stats = GetStatsEntry(ssrc);
+  if (!stats)
+    return;
+
+  stats->total_bitrate_bps = total_bitrate_bps;
+  stats->retransmit_bitrate_bps = retransmit_bitrate_bps;
+}
+
+void SendStatisticsProxy::FrameCountUpdated(const FrameCounts& frame_counts,
+                                            uint32_t ssrc) {
+  MutexLock lock(&mutex_);
+  VideoSendStream::StreamStats* stats = GetStatsEntry(ssrc);
+  if (!stats)
+    return;
+
+  stats->frame_counts = frame_counts;
+}
+
+void SendStatisticsProxy::SendSideDelayUpdated(int avg_delay_ms,
+                                               int max_delay_ms,
+                                               uint32_t ssrc) {
+  MutexLock lock(&mutex_);
+  VideoSendStream::StreamStats* stats = GetStatsEntry(ssrc);
+  if (!stats)
+    return;
+  stats->avg_delay_ms = avg_delay_ms;
+  stats->max_delay_ms = max_delay_ms;
+
+  uma_container_->delay_counter_.Add(avg_delay_ms);
+  uma_container_->max_delay_counter_.Add(max_delay_ms);
+}
+
+void SendStatisticsProxy::StatsTimer::Start(int64_t now_ms) {
+  if (start_ms == -1)
+    start_ms = now_ms;
+}
+
+void SendStatisticsProxy::StatsTimer::Stop(int64_t now_ms) {
+  if (start_ms != -1) {
+    total_ms += now_ms - start_ms;
+    start_ms = -1;
+  }
+}
+
+void SendStatisticsProxy::StatsTimer::Restart(int64_t now_ms) {
+  total_ms = 0;
+  if (start_ms != -1)
+    start_ms = now_ms;
+}
+
+void SendStatisticsProxy::SampleCounter::Add(int sample) {
+  sum += sample;
+  ++num_samples;
+}
+
+int SendStatisticsProxy::SampleCounter::Avg(
+    int64_t min_required_samples) const {
+  if (num_samples < min_required_samples || num_samples == 0)
+    return -1;
+  return static_cast<int>((sum + (num_samples / 2)) / num_samples);
+}
+
+void SendStatisticsProxy::BoolSampleCounter::Add(bool sample) {
+  if (sample)
+    ++sum;
+  ++num_samples;
+}
+
+void SendStatisticsProxy::BoolSampleCounter::Add(bool sample, int64_t count) {
+  if (sample)
+    sum += count;
+  num_samples += count;
+}
+int SendStatisticsProxy::BoolSampleCounter::Percent(
+    int64_t min_required_samples) const {
+  return Fraction(min_required_samples, 100.0f);
+}
+
+int SendStatisticsProxy::BoolSampleCounter::Permille(
+    int64_t min_required_samples) const {
+  return Fraction(min_required_samples, 1000.0f);
+}
+
+int SendStatisticsProxy::BoolSampleCounter::Fraction(
+    int64_t min_required_samples,
+    float multiplier) const {
+  if (num_samples < min_required_samples || num_samples == 0)
+    return -1;
+  return static_cast<int>((sum * multiplier / num_samples) + 0.5f);
+}
+
+SendStatisticsProxy::MaskedAdaptationCounts
+SendStatisticsProxy::Adaptations::MaskedCpuCounts() const {
+  return Mask(cpu_counts_, cpu_settings_);
+}
+
+SendStatisticsProxy::MaskedAdaptationCounts
+SendStatisticsProxy::Adaptations::MaskedQualityCounts() const {
+  return Mask(quality_counts_, quality_settings_);
+}
+
+void SendStatisticsProxy::Adaptations::set_cpu_counts(
+    const VideoAdaptationCounters& cpu_counts) {
+  cpu_counts_ = cpu_counts;
+}
+
+void SendStatisticsProxy::Adaptations::set_quality_counts(
+    const VideoAdaptationCounters& quality_counts) {
+  quality_counts_ = quality_counts;
+}
+
+VideoAdaptationCounters SendStatisticsProxy::Adaptations::cpu_counts() const {
+  return cpu_counts_;
+}
+
+VideoAdaptationCounters SendStatisticsProxy::Adaptations::quality_counts()
+    const {
+  return quality_counts_;
+}
+
+void SendStatisticsProxy::Adaptations::UpdateMaskingSettings(
+    VideoStreamEncoderObserver::AdaptationSettings cpu_settings,
+    VideoStreamEncoderObserver::AdaptationSettings quality_settings) {
+  cpu_settings_ = std::move(cpu_settings);
+  quality_settings_ = std::move(quality_settings);
+}
+
+SendStatisticsProxy::MaskedAdaptationCounts
+SendStatisticsProxy::Adaptations::Mask(
+    const VideoAdaptationCounters& counters,
+    const VideoStreamEncoderObserver::AdaptationSettings& settings) const {
+  MaskedAdaptationCounts masked_counts;
+  if (settings.resolution_scaling_enabled) {
+    masked_counts.resolution_adaptations = counters.resolution_adaptations;
+  }
+  if (settings.framerate_scaling_enabled) {
+    masked_counts.num_framerate_reductions = counters.fps_adaptations;
+  }
+  return masked_counts;
+}
+
+}  // namespace webrtc