Adds support for 16kHz input sample rate and mono channel config. in WebRTC.

media/audio/audio_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_AUDIO_UTIL_H_
 #define MEDIA_AUDIO_AUDIO_UTIL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 72 matching lines @@
 MEDIA_EXPORT double GetAudioHardwareSampleRate();
 
 // Returns the default audio input hardware sample-rate.
 MEDIA_EXPORT double GetAudioInputHardwareSampleRate();
 
 // Returns the optimal low-latency buffer size for the audio hardware.
 // This is the smallest buffer size the system can comfortably render
 // at without glitches.  The buffer size is in sample-frames.
 MEDIA_EXPORT size_t GetAudioHardwareBufferSize();
 
+// Returns the default number of channels for the audio input hardware.
+MEDIA_EXPORT size_t GetAudioInputHardwareChannels();
+
 // Functions that handle data buffer passed between processes in the shared
 // memory. Called on both IPC sides.
 
 MEDIA_EXPORT uint32 TotalSharedMemorySizeInBytes(uint32 packet_size);
 MEDIA_EXPORT uint32 PacketSizeSizeInBytes(uint32 shared_memory_created_size);
 MEDIA_EXPORT uint32 GetActualDataSizeInBytes(base::SharedMemory* shared_memory,
                                              uint32 shared_memory_size);
 MEDIA_EXPORT void SetActualDataSizeInBytes(base::SharedMemory* shared_memory,
                                            uint32 shared_memory_size,
                                            uint32 actual_data_size);
@@ skipping 13 matching lines @@
 // Crossfades |bytes_to_crossfade| bytes of data in |dest| with the
 // data in |src|. Assumes there is room in |dest| and enough data in |src|.
 MEDIA_EXPORT void Crossfade(int bytes_to_crossfade, int number_of_channels,
                             int bytes_per_channel, const uint8* src,
                             uint8* dest);
 
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_UTIL_H_