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 kRenderViewId = 123;
  27 static const int kRenderFrameId = 124;
  28 static const int kAnotherRenderViewId = 456;
  29 static const int kAnotherRenderFrameId = 678;
  30
  31 using media::AudioParameters;
  32
  33 class AudioRendererMixerManagerTest : public testing::Test {
  34  public:
  35   AudioRendererMixerManagerTest()
  36       : fake_config_(AudioParameters(), AudioParameters()) {
  37     AudioParameters output_params(
  38         media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
  39         media::CHANNEL_LAYOUT_STEREO,
  40         kSampleRate,
  41         16,
  42         kBufferSize);
  43     fake_config_.UpdateOutputConfig(output_params);
  44
  45     manager_.reset(new AudioRendererMixerManager(&fake_config_));
  46
  47     // We don't want to deal with instantiating a real AudioOutputDevice since
  48     // it's not important to our testing, so we inject a mock.
  49     mock_sink_ = new media::MockAudioRendererSink();
  50     manager_->SetAudioRendererSinkForTesting(mock_sink_.get());
  51   }
  52
  53   media::AudioRendererMixer* GetMixer(int source_render_view_id,
  54                                       const media::AudioParameters& params) {
  55     return manager_->GetMixer(source_render_view_id, MSG_ROUTING_NONE, params);
  56   }
  57
  58   void RemoveMixer(int source_render_view_id,
  59                    const media::AudioParameters& params) {
  60     return manager_->RemoveMixer(source_render_view_id, params);
  61   }
  62
  63   // Number of instantiated mixers.
  64   int mixer_count() {
  65     return manager_->mixers_.size();
  66   }
  67
  68  protected:
  69   media::AudioHardwareConfig fake_config_;
  70   scoped_ptr<AudioRendererMixerManager> manager_;
  71   scoped_refptr<media::MockAudioRendererSink> mock_sink_;
  72
  73   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerManagerTest);
  74 };
  75
  76 // Verify GetMixer() and RemoveMixer() both work as expected; particularly with
  77 // respect to the explicit ref counting done.
  78 TEST_F(AudioRendererMixerManagerTest, GetRemoveMixer) {
  79   // Since we're testing two different sets of parameters, we expect
  80   // AudioRendererMixerManager to call Start and Stop on our mock twice.
  81   EXPECT_CALL(*mock_sink_.get(), Start()).Times(2);
  82   EXPECT_CALL(*mock_sink_.get(), Stop()).Times(2);
  83
  84   // There should be no mixers outstanding to start with.
  85   EXPECT_EQ(mixer_count(), 0);
  86
  87   media::AudioParameters params1(
  88       media::AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate,
  89       kBitsPerChannel, kBufferSize);
  90
  91   media::AudioRendererMixer* mixer1 = GetMixer(kRenderViewId, params1);
  92   ASSERT_TRUE(mixer1);
  93   EXPECT_EQ(mixer_count(), 1);
  94
  95   // The same parameters should return the same mixer1.
  96   EXPECT_EQ(mixer1, GetMixer(kRenderViewId, params1));
  97   EXPECT_EQ(mixer_count(), 1);
  98
  99   // Remove the extra mixer we just acquired.
 100   RemoveMixer(kRenderViewId, params1);
 101   EXPECT_EQ(mixer_count(), 1);
 102
 103   media::AudioParameters params2(
 104       media::AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate * 2,
 105       kBitsPerChannel, kBufferSize * 2);
 106   media::AudioRendererMixer* mixer2 = GetMixer(kRenderViewId, params2);
 107   ASSERT_TRUE(mixer2);
 108   EXPECT_EQ(mixer_count(), 2);
 109
 110   // Different parameters should result in a different mixer1.
 111   EXPECT_NE(mixer1, mixer2);
 112
 113   // Remove both outstanding mixers.
 114   RemoveMixer(kRenderViewId, params1);
 115   EXPECT_EQ(mixer_count(), 1);
 116   RemoveMixer(kRenderViewId, params2);
 117   EXPECT_EQ(mixer_count(), 0);
 118 }
 119
 120 // Verify CreateInput() provides AudioRendererMixerInput with the appropriate
 121 // callbacks and they are working as expected.  Also, verify that separate
 122 // mixers are created for separate render views, even though the AudioParameters
 123 // are the same.
 124 TEST_F(AudioRendererMixerManagerTest, CreateInput) {
 125   // Expect AudioRendererMixerManager to call Start and Stop on our mock twice
 126   // each.  Note: Under normal conditions, each mixer would get its own sink!
 127   EXPECT_CALL(*mock_sink_.get(), Start()).Times(2);
 128   EXPECT_CALL(*mock_sink_.get(), Stop()).Times(2);
 129
 130   media::AudioParameters params(
 131       media::AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate,
 132       kBitsPerChannel, kBufferSize);
 133
 134   // Create two mixer inputs and ensure this doesn't instantiate any mixers yet.
 135   EXPECT_EQ(mixer_count(), 0);
 136   media::FakeAudioRenderCallback callback(0);
 137   scoped_refptr<media::AudioRendererMixerInput> input(
 138       manager_->CreateInput(kRenderViewId, kRenderFrameId));
 139   input->Initialize(params, &callback);
 140   EXPECT_EQ(mixer_count(), 0);
 141   media::FakeAudioRenderCallback another_callback(1);
 142   scoped_refptr<media::AudioRendererMixerInput> another_input(
 143       manager_->CreateInput(kAnotherRenderViewId, kAnotherRenderFrameId));
 144   another_input->Initialize(params, &another_callback);
 145   EXPECT_EQ(mixer_count(), 0);
 146
 147   // Implicitly test that AudioRendererMixerInput was provided with the expected
 148   // callbacks needed to acquire an AudioRendererMixer and remove it.
 149   input->Start();
 150   EXPECT_EQ(mixer_count(), 1);
 151   another_input->Start();
 152   EXPECT_EQ(mixer_count(), 2);
 153
 154   // Destroying the inputs should destroy the mixers.
 155   input->Stop();
 156   input = NULL;
 157   EXPECT_EQ(mixer_count(), 1);
 158   another_input->Stop();
 159   another_input = NULL;
 160   EXPECT_EQ(mixer_count(), 0);
 161 }
 162
 163 }  // namespace content