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 "ipc/ipc_message.h"
  10 #include "media/audio/audio_parameters.h"
  11 #include "media/base/audio_hardware_config.h"
  12 #include "media/base/audio_renderer_mixer.h"
  13 #include "media/base/audio_renderer_mixer_input.h"
  14 #include "media/base/fake_audio_render_callback.h"
  15 #include "media/base/mock_audio_renderer_sink.h"
  16 #include "testing/gmock/include/gmock/gmock.h"
  17 #include "testing/gtest/include/gtest/gtest.h"
  18
  19 namespace content {
  20
  21 static const int kBitsPerChannel = 16;
  22 static const int kSampleRate = 48000;
  23 static const int kBufferSize = 8192;
  24 static const media::ChannelLayout kChannelLayout = media::CHANNEL_LAYOUT_STEREO;
  25
  26 static const int kRenderFrameId = 124;
  27 static const int kAnotherRenderFrameId = 678;
  28
  29 using media::AudioParameters;
  30
  31 class AudioRendererMixerManagerTest : public testing::Test {
  32  public:
  33   AudioRendererMixerManagerTest()
  34       : fake_config_(AudioParameters(), AudioParameters()) {
  35     AudioParameters output_params(
  36         AudioParameters::AUDIO_PCM_LOW_LATENCY,
  37         media::CHANNEL_LAYOUT_STEREO,
  38         kSampleRate,
  39         16,
  40         kBufferSize);
  41     fake_config_.UpdateOutputConfig(output_params);
  42
  43     manager_.reset(new AudioRendererMixerManager(&fake_config_));
  44
  45     // We don't want to deal with instantiating a real AudioOutputDevice since
  46     // it's not important to our testing, so we inject a mock.
  47     mock_sink_ = new media::MockAudioRendererSink();
  48     manager_->SetAudioRendererSinkForTesting(mock_sink_.get());
  49   }
  50
  51   media::AudioRendererMixer* GetMixer(int source_render_frame_id,
  52                                       const media::AudioParameters& params) {
  53     return manager_->GetMixer(source_render_frame_id, params);
  54   }
  55
  56   void RemoveMixer(int source_render_frame_id,
  57                    const media::AudioParameters& params) {
  58     return manager_->RemoveMixer(source_render_frame_id, params);
  59   }
  60
  61   // Number of instantiated mixers.
  62   int mixer_count() {
  63     return manager_->mixers_.size();
  64   }
  65
  66  protected:
  67   media::AudioHardwareConfig fake_config_;
  68   scoped_ptr<AudioRendererMixerManager> manager_;
  69   scoped_refptr<media::MockAudioRendererSink> mock_sink_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerManagerTest);
  72 };
  73
  74 // Verify GetMixer() and RemoveMixer() both work as expected; particularly with
  75 // respect to the explicit ref counting done.
  76 TEST_F(AudioRendererMixerManagerTest, GetRemoveMixer) {
  77   // Since we're testing two different sets of parameters, we expect
  78   // AudioRendererMixerManager to call Start and Stop on our mock twice.
  79   EXPECT_CALL(*mock_sink_.get(), Start()).Times(2);
  80   EXPECT_CALL(*mock_sink_.get(), Stop()).Times(2);
  81
  82   // There should be no mixers outstanding to start with.
  83   EXPECT_EQ(mixer_count(), 0);
  84
  85   media::AudioParameters params1(
  86       AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate,
  87       kBitsPerChannel, kBufferSize);
  88
  89   media::AudioRendererMixer* mixer1 = GetMixer(kRenderFrameId, params1);
  90   ASSERT_TRUE(mixer1);
  91   EXPECT_EQ(mixer_count(), 1);
  92
  93   // The same parameters should return the same mixer1.
  94   EXPECT_EQ(mixer1, GetMixer(kRenderFrameId, params1));
  95   EXPECT_EQ(mixer_count(), 1);
  96
  97   // Remove the extra mixer we just acquired.
  98   RemoveMixer(kRenderFrameId, params1);
  99   EXPECT_EQ(mixer_count(), 1);
 100
 101   media::AudioParameters params2(
 102       AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate * 2,
 103       kBitsPerChannel, kBufferSize * 2);
 104   media::AudioRendererMixer* mixer2 = GetMixer(kRenderFrameId, params2);
 105   ASSERT_TRUE(mixer2);
 106   EXPECT_EQ(mixer_count(), 2);
 107
 108   // Different parameters should result in a different mixer1.
 109   EXPECT_NE(mixer1, mixer2);
 110
 111   // Remove both outstanding mixers.
 112   RemoveMixer(kRenderFrameId, params1);
 113   EXPECT_EQ(mixer_count(), 1);
 114   RemoveMixer(kRenderFrameId, params2);
 115   EXPECT_EQ(mixer_count(), 0);
 116 }
 117
 118 // Verify GetMixer() correctly deduplicates mixer with irrelevant AudioParameter
 119 // differences.
 120 TEST_F(AudioRendererMixerManagerTest, MixerReuse) {
 121   EXPECT_CALL(*mock_sink_.get(), Start()).Times(2);
 122   EXPECT_CALL(*mock_sink_.get(), Stop()).Times(2);
 123   EXPECT_EQ(mixer_count(), 0);
 124
 125   media::AudioParameters params1(AudioParameters::AUDIO_PCM_LINEAR,
 126                                  kChannelLayout,
 127                                  kSampleRate,
 128                                  kBitsPerChannel,
 129                                  kBufferSize);
 130   media::AudioRendererMixer* mixer1 = GetMixer(kRenderFrameId, params1);
 131   ASSERT_TRUE(mixer1);
 132   EXPECT_EQ(mixer_count(), 1);
 133
 134   // Different formats, bit depths, and buffer sizes should not result in a
 135   // different mixer.
 136   media::AudioParameters params2(AudioParameters::AUDIO_PCM_LOW_LATENCY,
 137                                  kChannelLayout, kSampleRate,
 138                                  kBitsPerChannel * 2, kBufferSize * 2);
 139   EXPECT_EQ(mixer1, GetMixer(kRenderFrameId, params2));
 140   EXPECT_EQ(mixer_count(), 1);
 141   RemoveMixer(kRenderFrameId, params2);
 142   EXPECT_EQ(mixer_count(), 1);
 143
 144   // Modify some parameters that do matter.
 145   media::AudioParameters params3(AudioParameters::AUDIO_PCM_LOW_LATENCY,
 146                                  media::CHANNEL_LAYOUT_MONO, kSampleRate * 2,
 147                                  kBitsPerChannel, kBufferSize);
 148   ASSERT_NE(params3.channel_layout(), params1.channel_layout());
 149
 150   EXPECT_NE(mixer1, GetMixer(kRenderFrameId, params3));
 151   EXPECT_EQ(mixer_count(), 2);
 152   RemoveMixer(kRenderFrameId, params3);
 153   EXPECT_EQ(mixer_count(), 1);
 154
 155   // Remove final mixer.
 156   RemoveMixer(kRenderFrameId, params1);
 157   EXPECT_EQ(mixer_count(), 0);
 158 }
 159
 160 // Verify CreateInput() provides AudioRendererMixerInput with the appropriate
 161 // callbacks and they are working as expected.  Also, verify that separate
 162 // mixers are created for separate render views, even though the AudioParameters
 163 // are the same.
 164 TEST_F(AudioRendererMixerManagerTest, CreateInput) {
 165   // Expect AudioRendererMixerManager to call Start and Stop on our mock twice
 166   // each.  Note: Under normal conditions, each mixer would get its own sink!
 167   EXPECT_CALL(*mock_sink_.get(), Start()).Times(2);
 168   EXPECT_CALL(*mock_sink_.get(), Stop()).Times(2);
 169
 170   media::AudioParameters params(
 171       AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate,
 172       kBitsPerChannel, kBufferSize);
 173
 174   // Create two mixer inputs and ensure this doesn't instantiate any mixers yet.
 175   EXPECT_EQ(mixer_count(), 0);
 176   media::FakeAudioRenderCallback callback(0);
 177   scoped_refptr<media::AudioRendererMixerInput> input(
 178       manager_->CreateInput(kRenderFrameId));
 179   input->Initialize(params, &callback);
 180   EXPECT_EQ(mixer_count(), 0);
 181   media::FakeAudioRenderCallback another_callback(1);
 182   scoped_refptr<media::AudioRendererMixerInput> another_input(
 183       manager_->CreateInput(kAnotherRenderFrameId));
 184   another_input->Initialize(params, &another_callback);
 185   EXPECT_EQ(mixer_count(), 0);
 186
 187   // Implicitly test that AudioRendererMixerInput was provided with the expected
 188   // callbacks needed to acquire an AudioRendererMixer and remove it.
 189   input->Start();
 190   EXPECT_EQ(mixer_count(), 1);
 191   another_input->Start();
 192   EXPECT_EQ(mixer_count(), 2);
 193
 194   // Destroying the inputs should destroy the mixers.
 195   input->Stop();
 196   input = NULL;
 197   EXPECT_EQ(mixer_count(), 1);
 198   another_input->Stop();
 199   another_input = NULL;
 200   EXPECT_EQ(mixer_count(), 0);
 201 }
 202
 203 }  // namespace content