Add a unified audio I/O backend for ChromeOS.

media/audio/cras/cras_unified_unittest.cc

Index: media/audio/cras/cras_unified_unittest.cc
diff --git a/media/audio/cras/cras_unified_unittest.cc b/media/audio/cras/cras_unified_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..73f718481373ca15fc463b768fcb5e4ee31d5e40
--- /dev/null
+++ b/media/audio/cras/cras_unified_unittest.cc
@@ -0,0 +1,157 @@
+// Copyright 2013 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 "base/synchronization/waitable_event.h"
+#include "base/test/test_timeouts.h"
+#include "base/time.h"
+#include "media/audio/cras/audio_manager_cras.h"
+#include "media/audio/cras/cras_unified.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using testing::_;
+using testing::DoAll;
+using testing::InvokeWithoutArgs;
+using testing::Return;
+using testing::SetArgumentPointee;
+using testing::StrictMock;
+
+namespace media {
+
+class MockAudioSourceCallback : public AudioOutputStream::AudioSourceCallback {
+ public:
+  MOCK_METHOD2(OnMoreData, int(AudioBus* audio_bus,
+                               AudioBuffersState buffers_state));
+  MOCK_METHOD3(OnMoreIOData, int(AudioBus* source,
+                                 AudioBus* dest,
+                                 AudioBuffersState buffers_state));
+  MOCK_METHOD1(OnError, void(AudioOutputStream* stream));
+};
+
+class MockAudioManagerCras : public AudioManagerCras {
+ public:
+  MOCK_METHOD0(Init, void());
+  MOCK_METHOD0(HasAudioOutputDevices, bool());
+  MOCK_METHOD0(HasAudioInputDevices, bool());
+  MOCK_METHOD1(MakeLinearOutputStream, AudioOutputStream*(
+      const AudioParameters& params));
+  MOCK_METHOD1(MakeLowLatencyOutputStream, AudioOutputStream*(
+      const AudioParameters& params));
+  MOCK_METHOD2(MakeLinearOutputStream, AudioInputStream*(
+      const AudioParameters& params, const std::string& device_id));
+  MOCK_METHOD2(MakeLowLatencyInputStream, AudioInputStream*(
+      const AudioParameters& params, const std::string& device_id));
+
+  // We need to override this function in order to skip the checking the number
+  // of active output streams. It is because the number of active streams
+  // is managed inside MakeAudioOutputStream, and we don't use
+  // MakeAudioOutputStream to create the stream in the tests.
+  virtual void ReleaseOutputStream(AudioOutputStream* stream) OVERRIDE {
+    DCHECK(stream);
+    delete stream;
+  }
+};
+
+class CrasUnifiedStreamTest : public testing::Test {
+ protected:
+  CrasUnifiedStreamTest() {
+    mock_manager_.reset(new StrictMock<MockAudioManagerCras>());
+  }
+
+  virtual ~CrasUnifiedStreamTest() {
+  }
+
+  CrasUnifiedStream* CreateStream(ChannelLayout layout) {
+    return CreateStream(layout, kTestFramesPerPacket);
+  }
+
+  CrasUnifiedStream* CreateStream(ChannelLayout layout,
+                                 int32 samples_per_packet) {
+    AudioParameters params(kTestFormat, layout, kTestSampleRate,
+                           kTestBitsPerSample, samples_per_packet);
+    return new CrasUnifiedStream(params, mock_manager_.get());
+  }
+
+  MockAudioManagerCras& mock_manager() {
+    return *(mock_manager_.get());
+  }
+
+  static const ChannelLayout kTestChannelLayout;
+  static const int kTestSampleRate;
+  static const int kTestBitsPerSample;
+  static const AudioParameters::Format kTestFormat;
+  static const uint32 kTestFramesPerPacket;
+
+  scoped_ptr<StrictMock<MockAudioManagerCras> > mock_manager_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CrasUnifiedStreamTest);
+};
+
+const ChannelLayout CrasUnifiedStreamTest::kTestChannelLayout =
+    CHANNEL_LAYOUT_STEREO;
+const int CrasUnifiedStreamTest::kTestSampleRate =
+    AudioParameters::kAudioCDSampleRate;
+const int CrasUnifiedStreamTest::kTestBitsPerSample = 16;
+const AudioParameters::Format CrasUnifiedStreamTest::kTestFormat =
+    AudioParameters::AUDIO_PCM_LINEAR;
+const uint32 CrasUnifiedStreamTest::kTestFramesPerPacket = 1000;
+
+TEST_F(CrasUnifiedStreamTest, ConstructedState) {
+  // Should support mono.
+  CrasUnifiedStream* test_stream = CreateStream(CHANNEL_LAYOUT_MONO);
+  test_stream->Close();
+
+  // Should support stereo.
+  test_stream = CreateStream(CHANNEL_LAYOUT_SURROUND);
+  EXPECT_TRUE(test_stream->Open());
+  test_stream->Close();
+
+  // Bad bits per sample.
+  AudioParameters bad_bps_params(kTestFormat, kTestChannelLayout,
+                                 kTestSampleRate, kTestBitsPerSample - 1,
+                                 kTestFramesPerPacket);
+  test_stream = new CrasUnifiedStream(bad_bps_params, mock_manager_.get());
+  EXPECT_FALSE(test_stream->Open());
+  test_stream->Close();
+
+  // Bad sample rate.
+  AudioParameters bad_rate_params(kTestFormat, kTestChannelLayout,
+                                  0, kTestBitsPerSample, kTestFramesPerPacket);
+  test_stream = new CrasUnifiedStream(bad_rate_params, mock_manager_.get());
+  EXPECT_FALSE(test_stream->Open());
+  test_stream->Close();
+
+  // Check that Mono works too.
+  test_stream = CreateStream(CHANNEL_LAYOUT_MONO);
+  ASSERT_TRUE(test_stream->Open());
+  test_stream->Close();
+}
+
+TEST_F(CrasUnifiedStreamTest, RenderFrames) {
+  CrasUnifiedStream* test_stream = CreateStream(CHANNEL_LAYOUT_MONO);
+  MockAudioSourceCallback mock_callback;
+
+  ASSERT_TRUE(test_stream->Open());
+
+  base::WaitableEvent event(false, false);
+
+  EXPECT_CALL(mock_callback, OnMoreData(_, _))
+      .WillRepeatedly(DoAll(
+          InvokeWithoutArgs(&event, &base::WaitableEvent::Signal),
+                            Return(kTestFramesPerPacket)));
+
+  test_stream->Start(&mock_callback);
+
+  // Wait for samples to be captured.
+  EXPECT_TRUE(event.TimedWait(TestTimeouts::action_timeout()));
+
+  test_stream->Stop();
+
+  test_stream->Close();
+}
+
+}  // namespace media