media/base/audio_renderer_mixer_input_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/bind.h"
   6 #include "base/bind_helpers.h"
   7 #include "media/base/audio_renderer_mixer.h"
   8 #include "media/base/audio_renderer_mixer_input.h"
   9 #include "media/base/fake_audio_render_callback.h"
  10 #include "media/base/mock_audio_renderer_sink.h"
  11 #include "testing/gmock/include/gmock/gmock.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13
  14 namespace media {
  15
  16 static const int kBitsPerChannel = 16;
  17 static const int kSampleRate = 48000;
  18 static const int kBufferSize = 8192;
  19 static const ChannelLayout kChannelLayout = CHANNEL_LAYOUT_STEREO;
  20
  21 class AudioRendererMixerInputTest : public testing::Test {
  22  public:
  23   AudioRendererMixerInputTest() {
  24     audio_parameters_ = AudioParameters(
  25         AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate,
  26         kBitsPerChannel, kBufferSize);
  27
  28     CreateMixerInput();
  29     fake_callback_.reset(new FakeAudioRenderCallback(0));
  30     mixer_input_->Initialize(audio_parameters_, fake_callback_.get());
  31     EXPECT_CALL(*this, RemoveMixer(testing::_));
  32     audio_bus_ = AudioBus::Create(audio_parameters_);
  33   }
  34
  35   void CreateMixerInput() {
  36     mixer_input_ = new AudioRendererMixerInput(
  37         base::Bind(
  38             &AudioRendererMixerInputTest::GetMixer, base::Unretained(this)),
  39         base::Bind(
  40             &AudioRendererMixerInputTest::RemoveMixer, base::Unretained(this)));
  41   }
  42
  43   AudioRendererMixer* GetMixer(const AudioParameters& params) {
  44     if (!mixer_) {
  45       scoped_refptr<MockAudioRendererSink> sink = new MockAudioRendererSink();
  46       EXPECT_CALL(*sink.get(), Start());
  47       EXPECT_CALL(*sink.get(), Stop());
  48
  49       mixer_.reset(new AudioRendererMixer(
  50           audio_parameters_, audio_parameters_, sink));
  51     }
  52     return mixer_.get();
  53   }
  54
  55   double ProvideInput() {
  56     return mixer_input_->ProvideInput(audio_bus_.get(), base::TimeDelta());
  57   }
  58
  59   MOCK_METHOD1(RemoveMixer, void(const AudioParameters&));
  60
  61  protected:
  62   virtual ~AudioRendererMixerInputTest() {}
  63
  64   AudioParameters audio_parameters_;
  65   scoped_ptr<AudioRendererMixer> mixer_;
  66   scoped_refptr<AudioRendererMixerInput> mixer_input_;
  67   scoped_ptr<FakeAudioRenderCallback> fake_callback_;
  68   scoped_ptr<AudioBus> audio_bus_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerInputTest);
  71 };
  72
  73 // Test that getting and setting the volume work as expected.  The volume is
  74 // returned from ProvideInput() only when playing.
  75 TEST_F(AudioRendererMixerInputTest, GetSetVolume) {
  76   mixer_input_->Start();
  77   mixer_input_->Play();
  78
  79   // Starting volume should be 1.0.
  80   EXPECT_DOUBLE_EQ(ProvideInput(), 1);
  81
  82   const double kVolume = 0.5;
  83   EXPECT_TRUE(mixer_input_->SetVolume(kVolume));
  84   EXPECT_DOUBLE_EQ(ProvideInput(), kVolume);
  85
  86   mixer_input_->Stop();
  87 }
  88
  89 // Test Start()/Play()/Pause()/Stop()/playing() all work as expected.  Also
  90 // implicitly tests that AddMixerInput() and RemoveMixerInput() work without
  91 // crashing; functional tests for these methods are in AudioRendererMixerTest.
  92 TEST_F(AudioRendererMixerInputTest, StartPlayPauseStopPlaying) {
  93   mixer_input_->Start();
  94   mixer_input_->Play();
  95   EXPECT_DOUBLE_EQ(ProvideInput(), 1);
  96   mixer_input_->Pause();
  97   mixer_input_->Play();
  98   EXPECT_DOUBLE_EQ(ProvideInput(), 1);
  99   mixer_input_->Stop();
 100 }
 101
 102 // Test that Stop() can be called before Initialize() and Start().
 103 TEST_F(AudioRendererMixerInputTest, StopBeforeInitializeOrStart) {
 104   // |mixer_input_| was initialized during construction.
 105   mixer_input_->Stop();
 106
 107   // Verify Stop() works without Initialize() or Start().
 108   CreateMixerInput();
 109   mixer_input_->Stop();
 110 }
 111
 112 }  // namespace media