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

media/audio/mac/audio_manager_mac.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/mac/audio_manager_mac.h"
 
 #include <CoreAudio/AudioHardware.h>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 607 matching lines @@
 }
 
 AudioInputStream* AudioManagerMac::MakeLowLatencyInputStream(
     const AudioParameters& params, const std::string& device_id) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
   // Gets the AudioDeviceID that refers to the AudioInputDevice with the device
   // unique id. This AudioDeviceID is used to set the device for Audio Unit.
   AudioDeviceID audio_device_id = GetAudioDeviceIdByUId(true, device_id);
   AudioInputStream* stream = NULL;
   if (audio_device_id != kAudioObjectUnknown) {
-    // AUAudioInputStream needs to be fed the preferred audio output parameters
-    // of the matching device so that the buffer size of both input and output
-    // can be matched.  See constructor of AUAudioInputStream for more.
-    const std::string associated_output_device(
-        GetAssociatedOutputDeviceID(device_id));
-    const AudioParameters output_params =
-        GetPreferredOutputStreamParameters(
-            associated_output_device.empty() ?
-                AudioManagerBase::kDefaultDeviceId : associated_output_device,
-            params);
-    stream = new AUAudioInputStream(this, params, output_params,
-        audio_device_id);
+    stream = new AUAudioInputStream(this, params, audio_device_id);
     input_streams_.push_back(stream);
   }
 
   return stream;
 }
 
 AudioParameters AudioManagerMac::GetPreferredOutputStreamParameters(
     const std::string& output_device_id,
     const AudioParameters& input_params) {
   const AudioDeviceID device = GetAudioDeviceIdByUId(false, output_device_id);
@@ skipping 119 matching lines @@
 void AudioManagerMac::ReleaseInputStream(AudioInputStream* stream) {
   input_streams_.remove(stream);
   AudioManagerBase::ReleaseInputStream(stream);
 }
 
 AudioManager* CreateAudioManager(AudioLogFactory* audio_log_factory) {
   return new AudioManagerMac(audio_log_factory);
 }
 
 }  // namespace media