Enable audio capture on Android

media/audio/audio_util.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.
 
 // Software adjust volume of samples, allows each audio stream its own
 // volume without impacting master volume for chrome and other applications.
 
 // Implemented as templates to allow 8, 16 and 32 bit implementations.
 // 8 bit is unsigned and biased by 128.
 
@@ skipping 117 matching lines @@
     // (see GetAudioHardwareBufferSize()), which corresponds to an output
     // delay of ~5.33ms.
     return 48000;
   }
 
   // Hardware sample-rate on Windows can be configured, so we must query.
   // TODO(henrika): improve possibility to specify an audio endpoint.
   // Use the default device (same as for Wave) for now to be compatible.
   return WASAPIAudioOutputStream::HardwareSampleRate();
 #elif defined(OS_ANDROID)
+  // TODO(leozwang): return native sampling rate on Android.
   return 16000;
 #else
   // Hardware for Linux is nearly always 48KHz.
   // TODO(crogers) : return correct value in rare non-48KHz cases.
   return 48000;
 #endif
 }
 
 int GetAudioInputHardwareSampleRate(const std::string& device_id) {
   // TODO(henrika): add support for device selection on all platforms.
@@ skipping 129 matching lines @@
   //    out performance was degraded compared to XP.
   //  - The regression was fixed in Windows 7 and most configurations will work
   //    with 2, but some (e.g., some Sound Blasters) still need 3.
   //  - Some XP configurations (even multi-processor ones) also need 3.
   return (base::win::GetVersion() == base::win::VERSION_VISTA) ? 4 : 3;
 }
 
 #endif
 
 }  // namespace media