Update decode/render fps stats when calling VideoReceiveStream::GetStats

webrtc/video/receive_statistics_proxy_unittest.cc

 /*
  *  Copyright 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 494 matching lines @@
   EXPECT_EQ(1, metrics::NumEvents("WebRTC.Video.JitterBufferDelayInMs",
                                   kJitterBufferMs));
   EXPECT_EQ(1,
             metrics::NumEvents("WebRTC.Video.TargetDelayInMs", kTargetDelayMs));
   EXPECT_EQ(
       1, metrics::NumEvents("WebRTC.Video.CurrentDelayInMs", kCurrentDelayMs));
   EXPECT_EQ(1,
             metrics::NumEvents("WebRTC.Video.OnewayDelayInMs", kTargetDelayMs));
 }
 
+TEST_F(ReceiveStatisticsProxyTest, DoesNotReportStaleFramerates) {
+  const int kDefaultFps = 30;
+  const int kWidth = 320;
+  const int kHeight = 240;
+
+  rtc::scoped_refptr<VideoFrameBuffer> video_frame_buffer(
+      I420Buffer::Create(kWidth, kHeight));
+  VideoFrame frame(video_frame_buffer, kVideoRotation_0, 0);
+
+  for (int i = 0; i < kDefaultFps; ++i) {
+    // Since OnRenderedFrame is never called the fps in each sample will be 0,
+    // i.e. bad
+    frame.set_ntp_time_ms(fake_clock_.CurrentNtpInMilliseconds());
+    statistics_proxy_->OnDecodedFrame(rtc::Optional<uint8_t>(),
+                                      VideoContentType::UNSPECIFIED);
+    statistics_proxy_->OnRenderedFrame(frame);
+    fake_clock_.AdvanceTimeMilliseconds(1000 / kDefaultFps);
+  }
+
+  EXPECT_EQ(kDefaultFps, statistics_proxy_->GetStats().decode_frame_rate);
+  EXPECT_EQ(kDefaultFps, statistics_proxy_->GetStats().render_frame_rate);
+
+  // FPS trackers in stats proxy have a 1000ms sliding window.
+  fake_clock_.AdvanceTimeMilliseconds(1000);
+  EXPECT_EQ(0, statistics_proxy_->GetStats().decode_frame_rate);
+  EXPECT_EQ(0, statistics_proxy_->GetStats().render_frame_rate);
+}
+
 }  // namespace webrtc