Caching AudioOutputDevice instances in mixer manager

media/base/audio_renderer_mixer_input_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 <stddef.h>
 #include <memory>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "media/base/audio_renderer_mixer.h"
 #include "media/base/audio_renderer_mixer_input.h"
 #include "media/base/fake_audio_render_callback.h"
 #include "media/base/mock_audio_renderer_sink.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 static const int kBitsPerChannel = 16;
 static const int kSampleRate = 48000;
 static const int kBufferSize = 8192;
 static const ChannelLayout kChannelLayout = CHANNEL_LAYOUT_STEREO;
-static const char kDefaultDeviceId[] = "";
+static const char kDefaultDeviceId[] = "default";
 static const char kUnauthorizedDeviceId[] = "unauthorized";
 static const char kNonexistentDeviceId[] = "nonexistent";
 
 class AudioRendererMixerInputTest : public testing::Test {
  public:
   AudioRendererMixerInputTest() {
     audio_parameters_ = AudioParameters(
         AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout, kSampleRate,
         kBitsPerChannel, kBufferSize);
 
     CreateMixerInput(kDefaultDeviceId);
     fake_callback_.reset(new FakeAudioRenderCallback(0));
     mixer_input_->Initialize(audio_parameters_, fake_callback_.get());
     audio_bus_ = AudioBus::Create(audio_parameters_);
   }
 
   void CreateMixerInput(const std::string& device_id) {
     mixer_input_ = new AudioRendererMixerInput(
         base::Bind(&AudioRendererMixerInputTest::GetMixer,
                    base::Unretained(this)),
         base::Bind(&AudioRendererMixerInputTest::RemoveMixer,
                    base::Unretained(this)),
+        base::Bind(&AudioRendererMixerInputTest::GetOutputDeviceInfo,
+                   base::Unretained(this)),
         device_id, url::Origin());
   }
 
   AudioRendererMixer* GetMixer(const AudioParameters& params,
                                const std::string& device_id,
                                const url::Origin& security_origin,
                                OutputDeviceStatus* device_status) {
     if (device_id == kNonexistentDeviceId) {
       if (device_status)
         *device_status = OUTPUT_DEVICE_STATUS_ERROR_NOT_FOUND;
       return nullptr;
     }
 
     if (device_id == kUnauthorizedDeviceId) {
       if (device_status)
         *device_status = OUTPUT_DEVICE_STATUS_ERROR_NOT_AUTHORIZED;
       return nullptr;
     }
 
-    size_t idx = device_id.empty() ? 0 : 1;
+    size_t idx = (device_id == kDefaultDeviceId) ? 0 : 1;
     if (!mixers_[idx]) {
-      scoped_refptr<MockAudioRendererSink> sink = new MockAudioRendererSink();
-      EXPECT_CALL(*sink.get(), Start());
-      EXPECT_CALL(*sink.get(), Stop());
+      sinks_[idx] =
+          new MockAudioRendererSink(device_id, OUTPUT_DEVICE_STATUS_OK);
+      EXPECT_CALL(*(sinks_[idx].get()), Start());
+      EXPECT_CALL(*(sinks_[idx].get()), Stop());
 
-      mixers_[idx].reset(new AudioRendererMixer(audio_parameters_, sink));
+      mixers_[idx].reset(new AudioRendererMixer(
+          audio_parameters_, sinks_[idx].get(),
+          base::Bind(&AudioRendererMixerInputTest::ReleaseSink,
+                     base::Unretained(this))));
     }
     EXPECT_CALL(*this, RemoveMixer(testing::_, device_id, testing::_));
+    EXPECT_CALL(*this, ReleaseSink(sinks_[idx].get()));
 
     if (device_status)
       *device_status = OUTPUT_DEVICE_STATUS_OK;
     return mixers_[idx].get();
   }
 
   double ProvideInput() {
     return mixer_input_->ProvideInput(audio_bus_.get(), base::TimeDelta());
   }
 
   MOCK_METHOD3(RemoveMixer,
                void(const AudioParameters&,
                     const std::string&,
                     const url::Origin&));
 
+  MOCK_METHOD2(GetOutputDeviceInfo,
+               OutputDeviceInfo(const std::string&, const url::Origin&));
+
+  MOCK_METHOD1(ReleaseSink, void(AudioRendererSink*));
+
   MOCK_METHOD1(SwitchCallbackCalled, void(OutputDeviceStatus));
+
   void SwitchCallback(base::RunLoop* loop, OutputDeviceStatus result) {
     SwitchCallbackCalled(result);
     loop->Quit();
   }
 
   AudioRendererMixer* GetInputMixer() { return mixer_input_->mixer_; }
 
  protected:
   virtual ~AudioRendererMixerInputTest() {}
 
   AudioParameters audio_parameters_;
+  scoped_refptr<MockAudioRendererSink> sinks_[2];  // Must outlive mixers.
   std::unique_ptr<AudioRendererMixer> mixers_[2];
   scoped_refptr<AudioRendererMixerInput> mixer_input_;
   std::unique_ptr<FakeAudioRenderCallback> fake_callback_;
   std::unique_ptr<AudioBus> audio_bus_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerInputTest);
 };
 
+TEST_F(AudioRendererMixerInputTest, GetDeviceInfo) {
+  ON_CALL(*this, GetOutputDeviceInfo(testing::_, testing::_))
+      .WillByDefault(testing::Return(OutputDeviceInfo()));
+  EXPECT_CALL(*this, GetOutputDeviceInfo(kDefaultDeviceId, testing::_))
+      .Times(testing::Exactly(1));
+
+  // Calling GetOutputDeviceInfo() should result in the mock call, since there
+  // is no mixer created yet for mixer input.
+  mixer_input_->GetOutputDeviceInfo();
+  mixer_input_->Start();
+
+  // This call should be directed to the mixer and should not result in the mock
+  // call.
+  EXPECT_STREQ(kDefaultDeviceId,
+               mixer_input_->GetOutputDeviceInfo().device_id().c_str());
+
+  mixer_input_->Stop();
+}
+
 // Test that getting and setting the volume work as expected.  The volume is
 // returned from ProvideInput() only when playing.
 TEST_F(AudioRendererMixerInputTest, GetSetVolume) {
   mixer_input_->Start();
   mixer_input_->Play();
 
   // Starting volume should be 1.0.
   EXPECT_DOUBLE_EQ(ProvideInput(), 1);
 
   const double kVolume = 0.5;
@@ skipping 149 matching lines @@
   EXPECT_CALL(*this, SwitchCallbackCalled(OUTPUT_DEVICE_STATUS_ERROR_INTERNAL));
   mixer_input_->SwitchOutputDevice(
       kDefaultDeviceId, url::Origin(),
       base::Bind(&AudioRendererMixerInputTest::SwitchCallback,
                  base::Unretained(this), &run_loop));
   mixer_input_->Stop();
   run_loop.Run();
 }
 
 }  // namespace media