Add a Clock and TickClock interface for mocking out time

media/base/pipeline_unittest.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 <vector>
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
+#include "base/test/simple_test_clock.h"
 #include "base/threading/simple_thread.h"
+#include "base/time/clock.h"
 #include "media/base/clock.h"
 #include "media/base/gmock_callback_support.h"
 #include "media/base/media_log.h"
 #include "media/base/mock_filters.h"
 #include "media/base/pipeline.h"
 #include "media/base/test_helpers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/size.h"
 
 using ::testing::_;
@@ skipping 270 matching lines @@
                                base::Unretained(&callbacks_)));
 
     // We expect the time to be updated only after the seek has completed.
     EXPECT_NE(seek_time, pipeline_->GetMediaTime());
     message_loop_.RunUntilIdle();
     EXPECT_EQ(seek_time, pipeline_->GetMediaTime());
   }
 
   // Fixture members.
   StrictMock<CallbackHelper> callbacks_;
+  base::SimpleTestClock test_clock_;
   MessageLoop message_loop_;
   scoped_refptr<Pipeline> pipeline_;
 
   scoped_ptr<FilterCollection> filter_collection_;
   scoped_refptr<MockDemuxer> demuxer_;
   scoped_refptr<MockVideoDecoder> video_decoder_;
   scoped_refptr<MockAudioDecoder> audio_decoder_;
   MockVideoRenderer* video_renderer_;
   MockAudioRenderer* audio_renderer_;
   scoped_refptr<StrictMock<MockDemuxerStream> > audio_stream_;
@@ skipping 290 matching lines @@
 
   // The ended callback shouldn't run until both renderers have ended.
   pipeline_->OnAudioRendererEnded();
   message_loop_.RunUntilIdle();
 
   EXPECT_CALL(callbacks_, OnEnded());
   pipeline_->OnVideoRendererEnded();
   message_loop_.RunUntilIdle();
 }
 
-// Static function & time variable used to simulate changes in wallclock time.
-static int64 g_static_clock_time;
-static base::Time StaticClockFunction() {
-  return base::Time::FromInternalValue(g_static_clock_time);
-}
-
 TEST_F(PipelineTest, AudioStreamShorterThanVideo) {
   base::TimeDelta duration = base::TimeDelta::FromSeconds(10);
 
   CreateAudioStream();
   CreateVideoStream();
   MockDemuxerStreamVector streams;
   streams.push_back(audio_stream());
   streams.push_back(video_stream());
 
   // Replace the clock so we can simulate wallclock time advancing w/o using
   // Sleep().
-  pipeline_->SetClockForTesting(new Clock(&StaticClockFunction));
+  pipeline_->SetClockForTesting(new Clock(&test_clock_));
 
   InitializeDemuxer(&streams, duration);
   InitializeAudioRenderer(audio_stream(), false);
   InitializeVideoRenderer(video_stream());
   InitializePipeline(PIPELINE_OK);
 
   EXPECT_EQ(0, pipeline_->GetMediaTime().ToInternalValue());
 
   float playback_rate = 1.0f;
   EXPECT_CALL(*demuxer_, SetPlaybackRate(playback_rate));
   EXPECT_CALL(*video_renderer_, SetPlaybackRate(playback_rate));
   EXPECT_CALL(*audio_renderer_, SetPlaybackRate(playback_rate));
   pipeline_->SetPlaybackRate(playback_rate);
   message_loop_.RunUntilIdle();
 
   InSequence s;
 
   // Verify that the clock doesn't advance since it hasn't been started by
   // a time update from the audio stream.
   int64 start_time = pipeline_->GetMediaTime().ToInternalValue();
-  g_static_clock_time +=
-      base::TimeDelta::FromMilliseconds(100).ToInternalValue();
+  test_clock_.Advance(base::TimeDelta::FromMilliseconds(100));
   EXPECT_EQ(pipeline_->GetMediaTime().ToInternalValue(), start_time);
 
   // Signal end of audio stream.
   pipeline_->OnAudioRendererEnded();
   message_loop_.RunUntilIdle();
 
   // Verify that the clock advances.
   start_time = pipeline_->GetMediaTime().ToInternalValue();
-  g_static_clock_time +=
-      base::TimeDelta::FromMilliseconds(100).ToInternalValue();
+  test_clock_.Advance(base::TimeDelta::FromMilliseconds(100));
   EXPECT_GT(pipeline_->GetMediaTime().ToInternalValue(), start_time);
 
   // Signal end of video stream and make sure OnEnded() callback occurs.
   EXPECT_CALL(callbacks_, OnEnded());
   pipeline_->OnVideoRendererEnded();
 }
 
 TEST_F(PipelineTest, ErrorDuringSeek) {
   CreateAudioStream();
   MockDemuxerStreamVector streams;
@@ skipping 560 matching lines @@
 INSTANTIATE_TEARDOWN_TEST(Error, InitAudioRenderer);
 INSTANTIATE_TEARDOWN_TEST(Error, InitVideoRenderer);
 INSTANTIATE_TEARDOWN_TEST(Error, Pausing);
 INSTANTIATE_TEARDOWN_TEST(Error, Flushing);
 INSTANTIATE_TEARDOWN_TEST(Error, Seeking);
 INSTANTIATE_TEARDOWN_TEST(Error, Prerolling);
 INSTANTIATE_TEARDOWN_TEST(Error, Starting);
 INSTANTIATE_TEARDOWN_TEST(Error, Playing);
 
 }  // namespace media