Exposes a shlib interface for media/audio path.

chromecast/media/audio/cast_audio_manager_factory_test.cc

+// Copyright 2015 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 <string>
+
+#include "chromecast/media/audio/cast_audio_manager_factory.h"
+#include "chromecast/public/cast_audio_output_device.h"
+#include "media/audio/audio_manager.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chromecast {
+namespace {
+
+// Testing constants.
+const int kTestBitDepth = 16;
+const auto kTestChannelLayout = media::ChannelLayout::CHANNEL_LAYOUT_STEREO;
+const char kTestDeviceId[] = "test_device_id";
+const int kTestFramesPerBuffer = 1024;
+const int kTestSampleRate = 48000;
+
+// Mock for CastAudioOutputDevice.
+class MockCastAudioOutputDevice : public chromecast::CastAudioOutputDevice {
+ public:
+  MockCastAudioOutputDevice() {}
+  virtual ~MockCastAudioOutputDevice() {}
+
+  MOCK_CONST_METHOD0(GetMaximumOutputStreamsAllowed, int());
+  MOCK_CONST_METHOD1(GetPreferredOutputStreamParameters,
+                     AudioParameters(const AudioParameters&));
+  MOCK_METHOD1(MakeOutputStream,
+               CastAudioOutputStream*(const AudioParameters&));
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MockCastAudioOutputDevice);
+};
+
+// This test verifies that passing a CastAudioManagerFactory to
+// media::AudioManager::SetFactory passes requests for audio stream creation
+// to the underlying CastAudioOutputDevice, in this case a mock. It is
+// intended to provide code coverage for CastAudioManagerFactory, but does not
+// provide full coverage for CastAudioManager.
+class CastAudioManagerFactoryTest : public testing::Test {
+ protected:
+  CastAudioManagerFactoryTest() : audio_manager_(nullptr) {}
+  ~CastAudioManagerFactoryTest() override {}
+
+  void SetUp() override {
+    // Set defaults for AudioParameters object.
+    testing::DefaultValue<chromecast::AudioParameters>::Set(
+        chromecast::AudioParameters());
+
+    // Set the factory. The factory must be reset in TearDown()
+    media::AudioManager::SetFactory(
+        new CastAudioManagerFactory(&mock_audio_output_device_));
+
+    // Create the AudioManager instance and verify it.
+    EXPECT_CALL(mock_audio_output_device_, GetMaximumOutputStreamsAllowed())
+        .WillOnce(testing::Return(1));
+    audio_manager_.reset(media::AudioManager::CreateForTesting());
+    ASSERT_NE(nullptr, audio_manager_.get());
+  }
+
+  void TearDown() override {
+    // This is crucial to not persisting state to other tests on the same gtest
+    // process. All other class members will destruct when this class destructs.
+    media::AudioManager::ResetFactoryForTesting();
+  }
+
+  testing::StrictMock<MockCastAudioOutputDevice> mock_audio_output_device_;
+  scoped_ptr<media::AudioManager> audio_manager_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CastAudioManagerFactoryTest);
+};
+
+// Verifies that the default output stream parameters are obtained from the
+// provided CastAudioOutputDevice instance.
+TEST_F(CastAudioManagerFactoryTest, GetPreferredOutputStreamParameters) {
+  EXPECT_CALL(mock_audio_output_device_,
+              GetPreferredOutputStreamParameters(testing::_));
+  audio_manager_->GetDefaultOutputStreamParameters();
+}
+
+// Verifies that creating a linear output stream invokes MakeOutputStream in
+// the provided CastAudioOutputDevice instance.
+TEST_F(CastAudioManagerFactoryTest, MakeLinearOutputStream) {
+  media::AudioParameters params(media::AudioParameters::AUDIO_PCM_LINEAR,
+                                kTestChannelLayout, kTestSampleRate,
+                                kTestBitDepth, kTestFramesPerBuffer);
+  EXPECT_CALL(mock_audio_output_device_, MakeOutputStream(testing::_));
+
+  // Note that the empty string must be passed in to select the default device.
+  audio_manager_->MakeAudioOutputStream(params, "");
+}
+
+// Verifies that creating a low-latency output stream invokes MakeOutputStream
+// in
+// the provided CastAudioOutputDevice instance.
+TEST_F(CastAudioManagerFactoryTest, MakeLowLatencyOutputStream) {
+  media::AudioParameters params(media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
+                                kTestChannelLayout, kTestSampleRate,
+                                kTestBitDepth, kTestFramesPerBuffer);
+  EXPECT_CALL(mock_audio_output_device_, MakeOutputStream(testing::_));
+  audio_manager_->MakeAudioOutputStream(params, kTestDeviceId);
+}
+
+}  // namespace
+}  // namespace chromecast