Adds support for CoreAudioUtil::IsChannelLayoutSupported()

media/audio/win/core_audio_util_win_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 "base/memory/scoped_ptr.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/win/scoped_com_initializer.h"
 #include "base/win/scoped_handle.h"
 #include "media/audio/win/core_audio_util_win.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 214 matching lines @@
   WAVEFORMATPCMEX format;
   EXPECT_TRUE(SUCCEEDED(CoreAudioUtil::GetSharedModeMixFormat(client,
                                                               &format)));
   EXPECT_GE(format.Format.nChannels, 1);
   EXPECT_GE(format.Format.nSamplesPerSec, 8000u);
   EXPECT_GE(format.Format.wBitsPerSample, 16);
   EXPECT_GE(format.Samples.wValidBitsPerSample, 16);
   EXPECT_EQ(format.Format.wFormatTag, WAVE_FORMAT_EXTENSIBLE);
 }
 
+TEST_F(CoreAudioUtilWinTest, IsChannelLayoutSupported) {
+  if (!CanRunAudioTest())
+    return;
+
+  // The preferred channel layout should always be supported. Being supported
+  // means that it is possible to initialize a shared mode stream with the
+  // particular channel layout.
+  AudioParameters mix_params;
+  HRESULT hr = CoreAudioUtil::GetPreferredAudioParameters(eRender, eConsole,
+                                                          &mix_params);
+  EXPECT_TRUE(SUCCEEDED(hr));
+  EXPECT_TRUE(mix_params.IsValid());
+  EXPECT_TRUE(CoreAudioUtil::IsChannelLayoutSupported(
+      eRender, eConsole, mix_params.channel_layout()));
+
+  // Check if it is possible to modify the channel layout to stereo for a
+  // device which reports that it prefers to be openen up in an other
+  // channel configuration.
+  if (mix_params.channel_layout() != CHANNEL_LAYOUT_STEREO) {
+    ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
+    // TODO(henrika): it might be too pessimistic to assume false as return
+    // value here.
+    EXPECT_FALSE(CoreAudioUtil::IsChannelLayoutSupported(
+        eRender, eConsole, channel_layout));
+  }
+}
+
 TEST_F(CoreAudioUtilWinTest, GetDevicePeriod) {
   if (!CanRunAudioTest())
     return;
 
   EDataFlow data[] = {eRender, eCapture};
 
   // Verify that the device periods are valid for the default render and
   // capture devices.
   for (int i = 0; i < arraysize(data); ++i) {
     ScopedComPtr<IAudioClient> client;
@@ skipping 172 matching lines @@
   // buffer.
   EXPECT_TRUE(CoreAudioUtil::FillRenderEndpointBufferWithSilence(
                   client, render_client));
   client->GetCurrentPadding(&num_queued_frames);
   EXPECT_EQ(num_queued_frames, endpoint_buffer_size);
 }
 
 //
 
 }  // namespace media