Adding force-wave-audio command line flag on Windows

media/audio/win/core_audio_util_win.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 "media/audio/win/core_audio_util_win.h"
 
 #include <Audioclient.h>
 #include <Functiondiscoverykeys_devpkey.h>
 
 #include "base/command_line.h"
@@ skipping 129 matching lines @@
                                 device_enumerator.ReceiveVoid());
 
   // If we hit CO_E_NOTINITIALIZED, CoInitialize has not been called and it
   // must be called at least once for each thread that uses the COM library.
   CHECK_NE(hr, CO_E_NOTINITIALIZED);
 
   return SUCCEEDED(hr);
 }
 
 bool CoreAudioUtil::IsSupported() {
+  // It is possible to force usage of WaveXxx APIs by using a command line flag.
+  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
+  if (cmd_line->HasSwitch(switches::kForceWaveAudio)) {
+    LOG(WARNING) << "Forcing usage of Windows WaveXxx APIs";
+    return false;
+  }
+
   // Microsoft does not plan to make the Core Audio APIs available for use
   // with earlier versions of Windows, including Microsoft Windows Server 2003,
   // Windows XP, Windows Millennium Edition, Windows 2000, and Windows 98.
   if (base::win::GetVersion() < base::win::VERSION_VISTA)
     return false;
 
   // The audio core APIs are implemented in the Mmdevapi.dll and Audioses.dll
   // system components.
   // Dependency Walker shows that it is enough to verify possibility to load
   // the Audioses DLL since it depends on Mmdevapi.dll.
@@ skipping 529 matching lines @@
     return false;
 
   // Using the AUDCLNT_BUFFERFLAGS_SILENT flag eliminates the need to
   // explicitly write silence data to the rendering buffer.
   DVLOG(2) << "filling up " << num_frames_to_fill << " frames with silence";
   return SUCCEEDED(render_client->ReleaseBuffer(num_frames_to_fill,
                                                 AUDCLNT_BUFFERFLAGS_SILENT));
 }
 
 }  // namespace media