Set overuse detector max frame interval based on target frame rate.

webrtc/video/vie_encoder_unittest.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 30 matching lines @@
 using DegredationPreference = VideoSendStream::DegradationPreference;
 using ScaleReason = AdaptationObserverInterface::AdaptReason;
 using ::testing::_;
 using ::testing::Return;
 
 namespace {
 const size_t kMaxPayloadLength = 1440;
 const int kTargetBitrateBps = 1000000;
 const int kLowTargetBitrateBps = kTargetBitrateBps / 10;
 const int kMaxInitialFramedrop = 4;
+const int kDefaultFramerate = 30;
 
 class TestBuffer : public webrtc::I420Buffer {
  public:
   TestBuffer(rtc::Event* event, int width, int height)
       : I420Buffer(width, height), event_(event) {}
 
  private:
   friend class rtc::RefCountedObject<TestBuffer>;
   ~TestBuffer() override {
     if (event_)
       event_->Set();
   }
   rtc::Event* const event_;
 };
 
+class CpuOveruseDetectorProxy : public OveruseFrameDetector {
+ public:
+  CpuOveruseDetectorProxy(const CpuOveruseOptions& options,
+                          AdaptationObserverInterface* overuse_observer,
+                          EncodedFrameObserver* encoder_timing_,
+                          CpuOveruseMetricsObserver* metrics_observer)
+      : OveruseFrameDetector(options,
+                             overuse_observer,
+                             encoder_timing_,
+                             metrics_observer),
+        last_target_framerate_fps_(-1) {}
+  virtual ~CpuOveruseDetectorProxy() {}
+
+  void OnTargetFramerateUpdated(int framerate_fps) override {
+    rtc::CritScope cs(&lock_);
+    last_target_framerate_fps_ = framerate_fps;
+    OveruseFrameDetector::OnTargetFramerateUpdated(framerate_fps);
+  }
+
+  int GetLastTargetFramerate() {
+    rtc::CritScope cs(&lock_);
+    return last_target_framerate_fps_;
+  }
+
+ private:
+  rtc::CriticalSection lock_;
+  int last_target_framerate_fps_ GUARDED_BY(lock_);
+};
+
 class ViEEncoderUnderTest : public ViEEncoder {
  public:
   ViEEncoderUnderTest(SendStatisticsProxy* stats_proxy,
                       const VideoSendStream::Config::EncoderSettings& settings)
       : ViEEncoder(1 /* number_of_cores */,
                    stats_proxy,
                    settings,
                    nullptr /* pre_encode_callback */,
-                   nullptr /* encoder_timing */) {}
+                   nullptr /* encoder_timing */,
+                   std::unique_ptr<OveruseFrameDetector>(
+                       overuse_detector_proxy_ = new CpuOveruseDetectorProxy(
+                           GetCpuOveruseOptions(settings.full_overuse_time),
+                           this,
+                           nullptr,
+                           stats_proxy))) {}
 
   void PostTaskAndWait(bool down, AdaptReason reason) {
     rtc::Event event(false, false);
     encoder_queue()->PostTask([this, &event, reason, down] {
       down ? AdaptDown(reason) : AdaptUp(reason);
       event.Set();
     });
     ASSERT_TRUE(event.Wait(5000));
   }
 
   // This is used as a synchronisation mechanism, to make sure that the
   // encoder queue is not blocked before we start sending it frames.
   void WaitUntilTaskQueueIsIdle() {
     rtc::Event event(false, false);
     encoder_queue()->PostTask([&event] {
       event.Set();
     });
     ASSERT_TRUE(event.Wait(5000));
   }
 
   void TriggerCpuOveruse() { PostTaskAndWait(true, AdaptReason::kCpu); }
 
   void TriggerCpuNormalUsage() { PostTaskAndWait(false, AdaptReason::kCpu); }
 
   void TriggerQualityLow() { PostTaskAndWait(true, AdaptReason::kQuality); }
 
   void TriggerQualityHigh() { PostTaskAndWait(false, AdaptReason::kQuality); }
+
+  CpuOveruseDetectorProxy* overuse_detector_proxy_;
 };
 
 class VideoStreamFactory
     : public VideoEncoderConfig::VideoStreamFactoryInterface {
  public:
-  explicit VideoStreamFactory(size_t num_temporal_layers)
-      : num_temporal_layers_(num_temporal_layers) {
+  explicit VideoStreamFactory(size_t num_temporal_layers, int framerate)
+      : num_temporal_layers_(num_temporal_layers), framerate_(framerate) {
     EXPECT_GT(num_temporal_layers, 0u);
+    EXPECT_GT(framerate, 0);
   }
 
  private:
   std::vector<VideoStream> CreateEncoderStreams(
       int width,
       int height,
       const VideoEncoderConfig& encoder_config) override {
     std::vector<VideoStream> streams =
         test::CreateVideoStreams(width, height, encoder_config);
     for (VideoStream& stream : streams) {
       stream.temporal_layer_thresholds_bps.resize(num_temporal_layers_ - 1);
+      stream.max_framerate = framerate_;
     }
     return streams;
   }
+
   const size_t num_temporal_layers_;
+  const int framerate_;
 };
 
 class AdaptingFrameForwarder : public test::FrameForwarder {
  public:
   AdaptingFrameForwarder() : adaptation_enabled_(false) {}
   ~AdaptingFrameForwarder() override {}
 
   void set_adaptation_enabled(bool enabled) {
     rtc::CritScope cs(&crit_);
     adaptation_enabled_ = enabled;
@@ skipping 122 matching lines @@
   void ResetEncoder(const std::string& payload_name,
                     size_t num_streams,
                     size_t num_temporal_layers,
                     bool nack_enabled) {
     video_send_config_.encoder_settings.payload_name = payload_name;
 
     VideoEncoderConfig video_encoder_config;
     video_encoder_config.number_of_streams = num_streams;
     video_encoder_config.max_bitrate_bps = kTargetBitrateBps;
     video_encoder_config.video_stream_factory =
-        new rtc::RefCountedObject<VideoStreamFactory>(num_temporal_layers);
+        new rtc::RefCountedObject<VideoStreamFactory>(num_temporal_layers,
+                                                      kDefaultFramerate);
     ConfigureEncoder(std::move(video_encoder_config), nack_enabled);
   }
 
   VideoFrame CreateFrame(int64_t ntp_time_ms,
                          rtc::Event* destruction_event) const {
     VideoFrame frame(new rtc::RefCountedObject<TestBuffer>(
                          destruction_event, codec_width_, codec_height_),
                      99, 99, kVideoRotation_0);
     frame.set_ntp_time_ms(ntp_time_ms);
     return frame;
@@ skipping 1532 matching lines @@
   SleepMs(kProcessIntervalMs + 1000 / kDefaultFps);
   EXPECT_CALL(bitrate_observer, OnBitrateAllocationUpdated(expected_bitrate))
       .Times(1);
   video_source_.IncomingCapturedFrame(CreateFrame(
       kStartTimeMs + kProcessIntervalMs, codec_width_, codec_height_));
   sink_.WaitForEncodedFrame(kStartTimeMs + kProcessIntervalMs);
 
   vie_encoder_->Stop();
 }
 
+TEST_F(ViEEncoderTest, OveruseDetectorUpdatedOnReconfigureAndAdaption) {
+  const int kFrameWidth = 1280;
+  const int kFrameHeight = 720;
+  const int kFramerate = 24;
+
+  vie_encoder_->OnBitrateUpdated(kTargetBitrateBps, 0, 0);
+  test::FrameForwarder source;
+  vie_encoder_->SetSource(
+      &source, VideoSendStream::DegradationPreference::kMaintainResolution);
+
+  // Insert a single frame, triggering initial configuration.
+  source.IncomingCapturedFrame(CreateFrame(1, kFrameWidth, kFrameHeight));
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+
+  EXPECT_EQ(vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate(),
+            kDefaultFramerate);
+
+  // Trigger reconfigure encoder (without resetting the entire instance).
+  VideoEncoderConfig video_encoder_config;
+  video_encoder_config.max_bitrate_bps = kTargetBitrateBps;
+  video_encoder_config.number_of_streams = 1;
+  video_encoder_config.video_stream_factory =
+      new rtc::RefCountedObject<VideoStreamFactory>(1, kFramerate);
+  vie_encoder_->ConfigureEncoder(std::move(video_encoder_config),
+                                 kMaxPayloadLength, false);
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+
+  // Detector should be updated with fps limit from codec config.
+  EXPECT_EQ(vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate(),
+            kFramerate);
+
+  // Trigger overuse, max framerate should be reduced.
+  VideoSendStream::Stats stats = stats_proxy_->GetStats();
+  stats.input_frame_rate = kFramerate;
+  stats_proxy_->SetMockStats(stats);
+  vie_encoder_->TriggerCpuOveruse();
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+  int adapted_framerate =
+      vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate();
+  EXPECT_LT(adapted_framerate, kFramerate);
+
+  // Trigger underuse, max framerate should go back to codec configured fps.
+  // Set extra low fps, to make sure it's actually reset, not just incremented.
+  stats = stats_proxy_->GetStats();
+  stats.input_frame_rate = adapted_framerate / 2;
+  stats_proxy_->SetMockStats(stats);
+  vie_encoder_->TriggerCpuNormalUsage();
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+  EXPECT_EQ(vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate(),
+            kFramerate);
+
+  vie_encoder_->Stop();
+}
+
+TEST_F(ViEEncoderTest, OveruseDetectorUpdatedRespectsFramerateAfterUnderuse) {
+  const int kFrameWidth = 1280;
+  const int kFrameHeight = 720;
+  const int kLowFramerate = 15;
+  const int kHighFramerate = 25;
+
+  vie_encoder_->OnBitrateUpdated(kTargetBitrateBps, 0, 0);
+  test::FrameForwarder source;
+  vie_encoder_->SetSource(
+      &source, VideoSendStream::DegradationPreference::kMaintainResolution);
+
+  // Trigger initial configuration.
+  VideoEncoderConfig video_encoder_config;
+  video_encoder_config.max_bitrate_bps = kTargetBitrateBps;
+  video_encoder_config.number_of_streams = 1;
+  video_encoder_config.video_stream_factory =
+      new rtc::RefCountedObject<VideoStreamFactory>(1, kLowFramerate);
+  source.IncomingCapturedFrame(CreateFrame(1, kFrameWidth, kFrameHeight));
+  vie_encoder_->ConfigureEncoder(std::move(video_encoder_config),
+                                 kMaxPayloadLength, false);
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+
+  EXPECT_EQ(vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate(),
+            kLowFramerate);
+
+  // Trigger overuse, max framerate should be reduced.
+  VideoSendStream::Stats stats = stats_proxy_->GetStats();
+  stats.input_frame_rate = kLowFramerate;
+  stats_proxy_->SetMockStats(stats);
+  vie_encoder_->TriggerCpuOveruse();
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+  int adapted_framerate =
+      vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate();
+  EXPECT_LT(adapted_framerate, kLowFramerate);
+
+  // Reconfigure the encoder with a new (higher max framerate), max fps should
+  // still respect the adaptation.
+  video_encoder_config.video_stream_factory =
+      new rtc::RefCountedObject<VideoStreamFactory>(1, kHighFramerate);
+  source.IncomingCapturedFrame(CreateFrame(1, kFrameWidth, kFrameHeight));
+  vie_encoder_->ConfigureEncoder(std::move(video_encoder_config),
+                                 kMaxPayloadLength, false);
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+
+  EXPECT_EQ(vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate(),
+            adapted_framerate);
+
+  // Trigger underuse, max framerate should go back to codec configured fps.
+  stats = stats_proxy_->GetStats();
+  stats.input_frame_rate = adapted_framerate;
+  stats_proxy_->SetMockStats(stats);
+  vie_encoder_->TriggerCpuNormalUsage();
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+  EXPECT_EQ(vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate(),
+            kHighFramerate);
+
+  vie_encoder_->Stop();
+}
+
+TEST_F(ViEEncoderTest, OveruseDetectorUpdatedOnDegradationPreferenceChange) {
+  const int kFrameWidth = 1280;
+  const int kFrameHeight = 720;
+  const int kFramerate = 24;
+
+  vie_encoder_->OnBitrateUpdated(kTargetBitrateBps, 0, 0);
+  test::FrameForwarder source;
+  vie_encoder_->SetSource(
+      &source, VideoSendStream::DegradationPreference::kMaintainResolution);
+
+  // Trigger initial configuration.
+  VideoEncoderConfig video_encoder_config;
+  video_encoder_config.max_bitrate_bps = kTargetBitrateBps;
+  video_encoder_config.number_of_streams = 1;
+  video_encoder_config.video_stream_factory =
+      new rtc::RefCountedObject<VideoStreamFactory>(1, kFramerate);
+  source.IncomingCapturedFrame(CreateFrame(1, kFrameWidth, kFrameHeight));
+  vie_encoder_->ConfigureEncoder(std::move(video_encoder_config),
+                                 kMaxPayloadLength, false);
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+
+  EXPECT_EQ(vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate(),
+            kFramerate);
+
+  // Trigger overuse, max framerate should be reduced.
+  VideoSendStream::Stats stats = stats_proxy_->GetStats();
+  stats.input_frame_rate = kFramerate;
+  stats_proxy_->SetMockStats(stats);
+  vie_encoder_->TriggerCpuOveruse();
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+  int adapted_framerate =
+      vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate();
+  EXPECT_LT(adapted_framerate, kFramerate);
+
+  // Change degradation preference to not enable framerate scaling. Target
+  // framerate should be changed to codec defined limit.
+  vie_encoder_->SetSource(
+      &source, VideoSendStream::DegradationPreference::kMaintainFramerate);
+  vie_encoder_->WaitUntilTaskQueueIsIdle();
+  EXPECT_EQ(vie_encoder_->overuse_detector_proxy_->GetLastTargetFramerate(),
+            kFramerate);
+
+  vie_encoder_->Stop();
+}
+
 TEST_F(ViEEncoderTest, DropsFramesAndScalesWhenBitrateIsTooLow) {
   const int kTooLowBitrateForFrameSizeBps = 10000;
   vie_encoder_->OnBitrateUpdated(kTooLowBitrateForFrameSizeBps, 0, 0);
   const int kWidth = 640;
   const int kHeight = 360;
 
   video_source_.IncomingCapturedFrame(CreateFrame(1, kWidth, kHeight));
 
   // Expect to drop this frame, the wait should time out.
   sink_.ExpectDroppedFrame();
@@ skipping 284 matching lines @@
   for (int i = 0; i < 10; ++i) {
     timestamp_ms += kMinFpsFrameInterval;
     fake_clock.AdvanceTimeMicros(kMinFpsFrameInterval * 1000);
     video_source_.IncomingCapturedFrame(
         CreateFrame(timestamp_ms, kFrameWidth, kFrameHeight));
     sink_.WaitForEncodedFrame(timestamp_ms);
   }
   vie_encoder_->Stop();
 }
 }  // namespace webrtc