[Cast] Limit frames in flight by duration, and not by number of frames.

media/cast/test/end2end_unittest.cc

 // Copyright 2013 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.
 //
 // This test generate synthetic data. For audio it's a sinusoid waveform with
 // frequency kSoundFrequency and different amplitudes. For video it's a pattern
 // that is shifting by one pixel per frame, each pixels neighbors right and down
 // is this pixels value +1, since the pixel value is 8 bit it will wrap
 // frequently within the image. Visually this will create diagonally color bands
 // that moves across the screen
@@ skipping 1380 matching lines @@
   StartBasicPlayer();
 
   int frames_counter = 0;
   for (; frames_counter < 10000; ++frames_counter) {
     SendFakeVideoFrame(testing_clock_sender_->NowTicks());
     RunTasks(kFrameTimerMs);
   }
   base::TimeTicks test_end = testing_clock_receiver_->NowTicks();
   RunTasks(100 * kFrameTimerMs + 1);  // Empty the pipeline.
   EXPECT_GT(video_ticks_.size(), 100ul);
+  VLOG(1) << "Fully transmitted " << video_ticks_.size()
+          << " out of 10000 frames.";
   EXPECT_LT((video_ticks_.back().second - test_end).InMilliseconds(), 1000);
 }
 
+// Tests that a system configured for 30 FPS drops frames when input is provided
+// at a much higher frame rate.
+TEST_F(End2EndTest, ShoveHighFrameRateDownYerThroat) {
+  Configure(CODEC_VIDEO_FAKE, CODEC_AUDIO_PCM16, 32000,
+            1);
+  receiver_to_sender_.SetPacketPipe(test::EvilNetwork().Pass());
+  sender_to_receiver_.SetPacketPipe(test::EvilNetwork().Pass());
+  Create();
+  StartBasicPlayer();
+
+  int frames_counter = 0;
+  for (; frames_counter < 10000; ++frames_counter) {
+    SendFakeVideoFrame(testing_clock_sender_->NowTicks());
+    RunTasks(10 /* 10 ms, but 33.3 expected by system */);
+  }
+  base::TimeTicks test_end = testing_clock_receiver_->NowTicks();
+  RunTasks(100 * kFrameTimerMs + 1);  // Empty the pipeline.
+  EXPECT_LT(100ul, video_ticks_.size());
+  EXPECT_GE(3334ul, video_ticks_.size());
+  VLOG(1) << "Fully transmitted " << video_ticks_.size()
+          << " out of 10000 frames.";
+  EXPECT_LT((video_ticks_.back().second - test_end).InMilliseconds(), 1000);
+}
+
 TEST_F(End2EndTest, OldPacketNetwork) {
   Configure(CODEC_VIDEO_FAKE, CODEC_AUDIO_PCM16, 32000, 1);
   sender_to_receiver_.SetPacketPipe(test::NewRandomDrop(0.01));
   scoped_ptr<test::PacketPipe> echo_chamber(
       test::NewDuplicateAndDelay(1, 10 * kFrameTimerMs));
   echo_chamber->AppendToPipe(
       test::NewDuplicateAndDelay(1, 20 * kFrameTimerMs));
   echo_chamber->AppendToPipe(
       test::NewDuplicateAndDelay(1, 40 * kFrameTimerMs));
   echo_chamber->AppendToPipe(
@@ skipping 52 matching lines @@
   EXPECT_LT(jump, 220u);
 }
 
 // TODO(pwestin): Add repeatable packet loss test.
 // TODO(pwestin): Add test for misaligned send get calls.
 // TODO(pwestin): Add more tests that does not resample.
 // TODO(pwestin): Add test when we have starvation for our RunTask.
 
 }  // namespace cast
 }  // namespace media