content/renderer/media/audio_renderer_mixer_manager_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/logging.h"
   6 #include "base/memory/ref_counted.h"
   7 #include "base/memory/scoped_ptr.h"
   8 #include "content/renderer/media/audio_renderer_mixer_manager.h"
   9 #include "media/audio/audio_parameters.h"
  10 #include "media/base/audio_hardware_config.h"
  11 #include "media/base/audio_renderer_mixer.h"
  12 #include "media/base/audio_renderer_mixer_input.h"
  13 #include "media/base/fake_audio_render_callback.h"
  14 #include "media/base/mock_audio_renderer_sink.h"
  15 #include "testing/gmock/include/gmock/gmock.h"
  16 #include "testing/gtest/include/gtest/gtest.h"
  17
  18 namespace content {
  19
  20 static const int kBitsPerChannel = 16;
  21 static const int kSampleRate = 48000;
  22 static const int kBufferSize = 8192;
  23 static const media::ChannelLayout kChannelLayout = media::CHANNEL_LAYOUT_STEREO;
  24
  25 static const int kRenderViewId = 123;
  26 static const int kAnotherRenderViewId = 456;
  27
  28 using media::AudioParameters;
  29
  30 class AudioRendererMixerManagerTest : public testing::Test {
  31  public:
  32   AudioRendererMixerManagerTest()
  33       : fake_config_(AudioParameters(), AudioParameters()) {
  34     AudioParameters output_params(
  35         media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
  36         media::CHANNEL_LAYOUT_STEREO,
  37         kSampleRate,
  38         16,
  39         kBufferSize);
  40     fake_config_.UpdateOutputConfig(output_params);
  41
  42     manager_.reset(new AudioRendererMixerManager(&fake_config_));
  43
  44     // We don't want to deal with instantiating a real AudioOutputDevice since
  45     // it's not important to our testing, so we inject a mock.
  46     mock_sink_ = new media::MockAudioRendererSink();
  47     manager_->SetAudioRendererSinkForTesting(mock_sink_);
  48   }
  49
  50   media::AudioRendererMixer* GetMixer(int source_render_view_id,
  51                                       const media::AudioParameters& params) {
  52     return manager_->GetMixer(source_render_view_id, params);
  53   }
  54
  55   void RemoveMixer(int source_render_view_id,
  56                    const media::AudioParameters& params) {
  57     return manager_->RemoveMixer(source_render_view_id, params);
  58   }
  59
  60   // Number of instantiated mixers.
  61   int mixer_count() {
  62     return manager_->mixers_.size();
  63   }
  64
  65  protected:
  66   media::AudioHardwareConfig fake_config_;
  67   scoped_ptr<AudioRendererMixerManager> manager_;
  68   scoped_refptr<media::MockAudioRendererSink> mock_sink_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerManagerTest);
  71 };
  72
  73 // Verify GetMixer() and RemoveMixer() both work as expected; particularly with
  74 // respect to the explicit ref counting done.
  75 TEST_F(AudioRendererMixerManagerTest, GetRemoveMixer) {
  76   // Since we're testing two different sets of parameters, we expect
  77   // AudioRendererMixerManager to call Start and Stop on our mock twice.
  78   EXPECT_CALL(*mock_sink_, Start()).Times(2);
  79   EXPECT_CALL(*mock_sink_, Stop()).Times(2);
  80
  81   // There should be no mixers outstanding to start with.
  82   EXPECT_EQ(mixer_count(), 0);
  83
  84   media::AudioParameters params1(
  85       media::AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate,
  86       kBitsPerChannel, kBufferSize);
  87
  88   media::AudioRendererMixer* mixer1 = GetMixer(kRenderViewId, params1);
  89   ASSERT_TRUE(mixer1);
  90   EXPECT_EQ(mixer_count(), 1);
  91
  92   // The same parameters should return the same mixer1.
  93   EXPECT_EQ(mixer1, GetMixer(kRenderViewId, params1));
  94   EXPECT_EQ(mixer_count(), 1);
  95
  96   // Remove the extra mixer we just acquired.
  97   RemoveMixer(kRenderViewId, params1);
  98   EXPECT_EQ(mixer_count(), 1);
  99
 100   media::AudioParameters params2(
 101       media::AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate * 2,
 102       kBitsPerChannel, kBufferSize * 2);
 103   media::AudioRendererMixer* mixer2 = GetMixer(kRenderViewId, params2);
 104   ASSERT_TRUE(mixer2);
 105   EXPECT_EQ(mixer_count(), 2);
 106
 107   // Different parameters should result in a different mixer1.
 108   EXPECT_NE(mixer1, mixer2);
 109
 110   // Remove both outstanding mixers.
 111   RemoveMixer(kRenderViewId, params1);
 112   EXPECT_EQ(mixer_count(), 1);
 113   RemoveMixer(kRenderViewId, params2);
 114   EXPECT_EQ(mixer_count(), 0);
 115 }
 116
 117 // Verify CreateInput() provides AudioRendererMixerInput with the appropriate
 118 // callbacks and they are working as expected.  Also, verify that separate
 119 // mixers are created for separate render views, even though the AudioParameters
 120 // are the same.
 121 TEST_F(AudioRendererMixerManagerTest, CreateInput) {
 122   // Expect AudioRendererMixerManager to call Start and Stop on our mock twice
 123   // each.  Note: Under normal conditions, each mixer would get its own sink!
 124   EXPECT_CALL(*mock_sink_, Start()).Times(2);
 125   EXPECT_CALL(*mock_sink_, Stop()).Times(2);
 126
 127   media::AudioParameters params(
 128       media::AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate,
 129       kBitsPerChannel, kBufferSize);
 130
 131   // Create two mixer inputs and ensure this doesn't instantiate any mixers yet.
 132   EXPECT_EQ(mixer_count(), 0);
 133   scoped_refptr<media::AudioRendererMixerInput> input(
 134       manager_->CreateInput(kRenderViewId));
 135   EXPECT_EQ(mixer_count(), 0);
 136   scoped_refptr<media::AudioRendererMixerInput> another_input(
 137       manager_->CreateInput(kAnotherRenderViewId));
 138   EXPECT_EQ(mixer_count(), 0);
 139
 140   // Implicitly test that AudioRendererMixerInput was provided with the expected
 141   // callbacks needed to acquire an AudioRendererMixer and remove it.
 142   media::FakeAudioRenderCallback callback(0);
 143   input->Initialize(params, &callback);
 144   EXPECT_EQ(mixer_count(), 1);
 145   media::FakeAudioRenderCallback another_callback(1);
 146   another_input->Initialize(params, &another_callback);
 147   EXPECT_EQ(mixer_count(), 2);
 148
 149   // Destroying the inputs should destroy the mixers.
 150   input = NULL;
 151   EXPECT_EQ(mixer_count(), 1);
 152   another_input = NULL;
 153   EXPECT_EQ(mixer_count(), 0);
 154 }
 155
 156 }  // namespace content