Add support for multichannel playback to OpenSLES output.

media/audio/android/opensles_util.h

 // 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.
 
 #ifndef MEDIA_AUDIO_ANDROID_OPENSLES_UTIL_H_
 #define MEDIA_AUDIO_ANDROID_OPENSLES_UTIL_H_
 
 #include <SLES/OpenSLES.h>
 
 #include "base/logging.h"
+#include "media/base/media_export.h"
 
 namespace media {
 
 template <typename SLType, typename SLDerefType>
 class ScopedSLObject {
  public:
   ScopedSLObject() : obj_(NULL) {}
 
   ~ScopedSLObject() { Reset(); }
 
@@ skipping 12 matching lines @@
       obj_ = NULL;
     }
   }
 
  private:
   SLType obj_;
 };
 
 typedef ScopedSLObject<SLObjectItf, const SLObjectItf_*> ScopedSLObjectItf;
 
+// Guesses the channel mask for a given channel count. Android does not offer a
+// way to configure the layout, so this will be incorrect for less common
+// channel layouts.
+MEDIA_EXPORT SLuint32 ChannelCountToSLESChannelMask(int channel_count);
+
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_ANDROID_OPENSLES_UTIL_H_