RESOURCE_UTILIZATION in VideoFrameMetadata, a consumer feedback signal.

media/cast/sender/video_sender_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 545 matching lines @@
   EXPECT_EQ(0, transport_.number_of_rtp_packets());
 }
 
 TEST_F(VideoSenderTest, CheckVideoFrameFactoryIsNull) {
   InitEncoder(false, true);
   ASSERT_EQ(STATUS_INITIALIZED, operational_status_);
 
   EXPECT_EQ(nullptr, video_sender_->CreateVideoFrameFactory().get());
 }
 
+TEST_F(VideoSenderTest, PopulatesStressLevelInFrameMetadata) {
+  InitEncoder(false, true);
+  ASSERT_EQ(STATUS_INITIALIZED, operational_status_);
+
+  for (int i = 0; i < 3; ++i) {
+    scoped_refptr<media::VideoFrame> video_frame = GetNewVideoFrame();
+    ASSERT_FALSE(video_frame->metadata()->HasKey(
+        media::VideoFrameMetadata::STRESS_LEVEL));
+
+    const base::TimeTicks reference_time = testing_clock_->NowTicks();
+    video_sender_->InsertRawVideoFrame(video_frame, reference_time);
+
+    // Run encode tasks.  VideoSender::OnEncodedVideoFrame() will be called once
+    // encoding of the frame is complete, and this is when the STRESS_LEVEL
+    // metadata is populated.
+    RunTasks(33);
+
+    // The first frame will be a key frame, so no stress level will be reported.
+    // The second and third frames should have non-negative values.  We don't
+    // check for specific values because they are dependent on real-world CPU
+    // encode time.
+    if (i == 0) {
+      EXPECT_FALSE(video_frame->metadata()->HasKey(
+          media::VideoFrameMetadata::STRESS_LEVEL));
+    } else {
+      double stress_level = -1.0;
+      EXPECT_TRUE(video_frame->metadata()->GetDouble(
+          media::VideoFrameMetadata::STRESS_LEVEL, &stress_level));
+      EXPECT_LE(0.0, stress_level);
+      DVLOG(1) << "Stress level computed by VideoSender is: " << stress_level;
+    }
+  }
+}
+
 }  // namespace cast
 }  // namespace media