changed the input low latency input impl to use client's requested buffer size on Mac

media/audio/mac/audio_low_latency_input_mac.h

Index: media/audio/mac/audio_low_latency_input_mac.h
diff --git a/media/audio/mac/audio_low_latency_input_mac.h b/media/audio/mac/audio_low_latency_input_mac.h
index 7726227eae5efce056c259d35178a0bb6fd63b42..059cf1f808b59dca4833038a759276df51cc54bb 100644
--- a/media/audio/mac/audio_low_latency_input_mac.h
+++ b/media/audio/mac/audio_low_latency_input_mac.h
@@ -45,11 +45,11 @@
 #include "media/audio/agc_audio_stream.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
-#include "media/base/seekable_buffer.h"
 
 namespace media {
 
 class AudioBus;
+class AudioFifo;
 class AudioManagerMac;
 class DataBuffer;
 
@@ -59,7 +59,6 @@ class AUAudioInputStream : public AgcAudioStream<AudioInputStream> {
   // the audio manager who is creating this object.
   AUAudioInputStream(AudioManagerMac* manager,
                      const AudioParameters& input_params,
-                     const AudioParameters& output_params,
                      AudioDeviceID audio_device_id);
   // The dtor is typically called by the AudioManager only and it is usually
   // triggered by calling AudioInputStream::Close().
@@ -115,7 +114,7 @@ class AUAudioInputStream : public AgcAudioStream<AudioInputStream> {
   AudioManagerMac* manager_;
 
   // Contains the desired number of audio frames in each callback.
-  size_t number_of_frames_;
+  const size_t number_of_frames_;
 
   // Pointer to the object that will receive the recorded audio samples.
   AudioInputCallback* sink_;
@@ -145,31 +144,24 @@ class AUAudioInputStream : public AgcAudioStream<AudioInputStream> {
   // Fixed capture hardware latency in frames.
   double hardware_latency_frames_;
 
-  // Delay due to the FIFO in bytes.
-  int fifo_delay_bytes_;
-
   // The number of channels in each frame of audio data, which is used
   // when querying the volume of each channel.
   int number_of_channels_in_frame_;
 
-  // Accumulates recorded data packets until the requested size has been stored.
-  scoped_ptr<media::SeekableBuffer> fifo_;
-
-   // Intermediate storage of data from the FIFO before sending it to the
-   // client using the OnData() callback.
-  scoped_refptr<media::DataBuffer> data_;
-
-  // The client requests that the recorded data shall be delivered using
-  // OnData() callbacks where each callback contains this amount of bytes.
-  int requested_size_bytes_;
+  // Dynamically allocated FIFO used to accumulates recorded data when
+  // CoreAudio delivers non-requested frame size of data.
+  scoped_ptr<media::AudioFifo> fifo_;
 
   // Used to defer Start() to workaround http://crbug.com/160920.
   base::CancelableClosure deferred_start_cb_;
 
-  // Extra audio bus used for storage of deinterleaved data for the OnData
-  // callback.
+  // Audio bus used for storage of deinterleaved data for the OnData callback.
   scoped_ptr<media::AudioBus> audio_bus_;
 
+  // Audio bus used to convert interleaved data to deinterleaved data before
+  // storing data to FIFO or delivering data via OnData callback.
+  scoped_ptr<media::AudioBus> audio_wrapper_;
+
   DISALLOW_COPY_AND_ASSIGN(AUAudioInputStream);
 };