Implement disabling and enabling media tracks

media/test/pipeline_integration_test.cc

 // Copyright (c) 2012 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 <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
 
@@ skipping 924 matching lines @@
 
   Play();
 
   ASSERT_TRUE(WaitUntilOnEnded());
 
   EXPECT_HASH_EQ("f0be120a90a811506777c99a2cdf7cc1", GetVideoHash());
   EXPECT_HASH_EQ("-3.59,-2.06,-0.43,2.15,0.77,-0.95,", GetAudioHash());
   EXPECT_TRUE(demuxer_->GetTimelineOffset().is_null());
 }
 
+TEST_F(PipelineIntegrationTest, PlaybackWithAudioTrackDisabled) {
+  ASSERT_EQ(PIPELINE_OK, Start("bear-320x240.webm", kHashed | kClockless));
+
+  std::vector<MediaTrack::Id> empty;
+  pipeline_->OnEnabledAudioTracksChanged(empty);
+  message_loop_.RunUntilIdle();
+
+  // Seek to flush the pipeline and ensure there's no prerolled audio data.
+  ASSERT_TRUE(Seek(base::TimeDelta::FromSeconds(0)));
+  Play();
+
+  ASSERT_TRUE(WaitUntilOnEnded());
+
+  // Verify that no audio has been rendered, since we disabled audio tracks.
+  EXPECT_HASH_EQ(kNullAudioHash, GetAudioHash());
+}
+
+TEST_F(PipelineIntegrationTest, PlaybackWithVideoTrackDisabled) {
+  ASSERT_EQ(PIPELINE_OK, Start("bear-320x240.webm", kHashed | kClockless));
+
+  std::vector<MediaTrack::Id> empty;
+  pipeline_->OnSelectedVideoTrackChanged(empty);
+  message_loop_.RunUntilIdle();
+
+  // Seek to flush the pipeline and ensure there's no prerolled video data.
+  ASSERT_TRUE(Seek(base::TimeDelta::FromSeconds(0)));
+
+  // Reset the video hash in case some of the prerolled video frames have been
+  // hashed already.
+  ResetVideoHash();
+
+  Play();
+
+  ASSERT_TRUE(WaitUntilOnEnded());
+
+  // Verify that no audio has been rendered, since we disabled audio tracks.
+  EXPECT_HASH_EQ(kNullVideoHash, GetVideoHash());

[chcunningham, 2016/06/29 22:49:13]

These are a great start. Can you add some test for the restart-renderer paths?

[chcunningham, 2016/06/29 22:58:29]

Ignore me - I see you did this in your latest PS

[servolk, 2016/06/29 23:40:13]

Yep, added more complete tests in latest PS.

+}
+
 TEST_F(PipelineIntegrationTest,
        MAYBE_CLOCKLESS(BasicPlaybackOpusOggTrimmingHashed)) {
   ASSERT_EQ(PIPELINE_OK,
             Start("opus-trimming-test.webm", kHashed | kClockless));
 
   Play();
 
   ASSERT_TRUE(WaitUntilOnEnded());
   EXPECT_HASH_EQ(kOpusEndTrimmingHash_1, GetAudioHash());
 
@@ skipping 1348 matching lines @@
 
 TEST_F(PipelineIntegrationTest, BasicPlaybackPositiveStartTime) {
   ASSERT_EQ(PIPELINE_OK, Start("nonzero-start-time.webm"));
   Play();
   ASSERT_TRUE(WaitUntilOnEnded());
   ASSERT_EQ(base::TimeDelta::FromMicroseconds(396000),
             demuxer_->GetStartTime());
 }
 
 }  // namespace media