Adds support for multi-channel output audio for the low-latency path in Windows.

media/audio/win/audio_low_latency_output_win_unittest.cc

Index: media/audio/win/audio_low_latency_output_win_unittest.cc
diff --git a/media/audio/win/audio_low_latency_output_win_unittest.cc b/media/audio/win/audio_low_latency_output_win_unittest.cc
index 3ab9268cc58a642489abc4b176b591a1bd38703c..aee195a7526cf45f152e9f0c9ac3b88c2380254d 100644
--- a/media/audio/win/audio_low_latency_output_win_unittest.cc
+++ b/media/audio/win/audio_low_latency_output_win_unittest.cc
@@ -243,12 +243,23 @@ static AudioOutputStream* CreateDefaultAudioOutputStream(
   return aos;
 }
 
+TEST(WASAPIAudioOutputStreamTest, HardwareChannelCount) {
+  scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
+  if (!CanRunAudioTests(audio_manager.get()))
+    return;
+
+  ScopedCOMInitializer com_init(ScopedCOMInitializer::kMTA);
+
+  int channel_count = WASAPIAudioOutputStream::HardwareChannelCount();
+  EXPECT_GE(channel_count, 0);
+}
+
 // Verify that we can retrieve the current hardware/mixing sample rate
 // for all supported device roles. The ERole enumeration defines constants
 // that indicate the role that the system/user has assigned to an audio
 // endpoint device.
 // TODO(henrika): modify this test when we support full device enumeration.
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestHardwareSampleRate) {
+TEST(WASAPIAudioOutputStreamTest, HardwareSampleRate) {
   // Skip this test in exclusive mode since the resulting rate is only utilized
   // for shared mode streams.
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
@@ -275,7 +286,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestHardwareSampleRate) {
 }
 
 // Test Create(), Close() calling sequence.
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestCreateAndClose) {
+TEST(WASAPIAudioOutputStreamTest, CreateAndClose) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -284,7 +295,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestCreateAndClose) {
 }
 
 // Test Open(), Close() calling sequence.
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestOpenAndClose) {
+TEST(WASAPIAudioOutputStreamTest, OpenAndClose) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -294,7 +305,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestOpenAndClose) {
 }
 
 // Test Open(), Start(), Close() calling sequence.
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestOpenStartAndClose) {
+TEST(WASAPIAudioOutputStreamTest, OpenStartAndClose) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -308,7 +319,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestOpenStartAndClose) {
 }
 
 // Test Open(), Start(), Stop(), Close() calling sequence.
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestOpenStartStopAndClose) {
+TEST(WASAPIAudioOutputStreamTest, OpenStartStopAndClose) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -323,7 +334,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestOpenStartStopAndClose) {
 }
 
 // Test SetVolume(), GetVolume()
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestVolume) {
+TEST(WASAPIAudioOutputStreamTest, Volume) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -360,7 +371,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestVolume) {
 }
 
 // Test some additional calling sequences.
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestMiscCallingSequences) {
+TEST(WASAPIAudioOutputStreamTest, MiscCallingSequences) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -400,7 +411,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestMiscCallingSequences) {
 }
 
 // Use default packet size (10ms) and verify that rendering starts.
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestPacketSizeInMilliseconds) {
+TEST(WASAPIAudioOutputStreamTest, PacketSizeInMilliseconds) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -438,7 +449,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestPacketSizeInMilliseconds) {
 
 // Use a fixed packets size (independent of sample rate) and verify
 // that rendering starts.
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestPacketSizeInSamples) {
+TEST(WASAPIAudioOutputStreamTest, PacketSizeInSamples) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -475,7 +486,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestPacketSizeInSamples) {
   aos->Close();
 }
 
-TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestMono) {
+TEST(WASAPIAudioOutputStreamTest, Mono) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -525,7 +536,7 @@ TEST(WinAudioOutputTest, WASAPIAudioOutputStreamTestMono) {
 // with --gtest_also_run_disabled_tests or set the GTEST_ALSO_RUN_DISABLED_TESTS
 // environment variable to a value greater than 0.
 // The test files are approximately 20 seconds long.
-TEST(WinAudioOutputTest, DISABLED_WASAPIAudioOutputStreamReadFromFile) {
+TEST(WASAPIAudioOutputStreamTest, DISABLED_ReadFromFile) {
   scoped_ptr<AudioManager> audio_manager(AudioManager::Create());
   if (!CanRunAudioTests(audio_manager.get()))
     return;
@@ -573,7 +584,7 @@ TEST(WinAudioOutputTest, DISABLED_WASAPIAudioOutputStreamReadFromFile) {
 // certain set of audio parameters and a sample rate of 48kHz.
 // The expected outcomes of each setting in this test has been derived
 // manually using log outputs (--v=1).
-TEST(WinAudioOutputTest, WASAPIExclusiveModeBufferSizesAt48kHz) {
+TEST(WASAPIAudioOutputStreamTest, ExclusiveModeBufferSizesAt48kHz) {
   if (!ExclusiveModeIsEnabled())
     return;
 
@@ -624,7 +635,7 @@ TEST(WinAudioOutputTest, WASAPIExclusiveModeBufferSizesAt48kHz) {
 // certain set of audio parameters and a sample rate of 44.1kHz.
 // The expected outcomes of each setting in this test has been derived
 // manually using log outputs (--v=1).
-TEST(WinAudioOutputTest, WASAPIExclusiveModeBufferSizesAt44kHz) {
+TEST(WASAPIAudioOutputStreamTest, ExclusiveModeBufferSizesAt44kHz) {
   if (!ExclusiveModeIsEnabled())
     return;
 
@@ -682,7 +693,7 @@ TEST(WinAudioOutputTest, WASAPIExclusiveModeBufferSizesAt44kHz) {
 
 // Verify that we can open and start the output stream in exclusive mode at
 // the lowest possible delay at 48kHz.
-TEST(WinAudioOutputTest, WASAPIExclusiveModeMinBufferSizeAt48kHz) {
+TEST(WASAPIAudioOutputStreamTest, ExclusiveModeMinBufferSizeAt48kHz) {
   if (!ExclusiveModeIsEnabled())
     return;
 
@@ -724,7 +735,7 @@ TEST(WinAudioOutputTest, WASAPIExclusiveModeMinBufferSizeAt48kHz) {
 
 // Verify that we can open and start the output stream in exclusive mode at
 // the lowest possible delay at 44.1kHz.
-TEST(WinAudioOutputTest, WASAPIExclusiveModeMinBufferSizeAt44kHz) {
+TEST(WASAPIAudioOutputStreamTest, ExclusiveModeMinBufferSizeAt44kHz) {
   if (!ExclusiveModeIsEnabled())
     return;