Revert 159666 - Use clients' preferred buffer size when the sample rates match and it is a number s…

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 <CoreAudio/AudioHardware.h>
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/mac/mac_logging.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/sys_string_conversions.h"
-#include "media/audio/audio_util.h"
 #include "media/audio/mac/audio_input_mac.h"
 #include "media/audio/mac/audio_low_latency_input_mac.h"
 #include "media/audio/mac/audio_low_latency_output_mac.h"
 #include "media/audio/mac/audio_manager_mac.h"
 #include "media/audio/mac/audio_output_mac.h"
 #include "media/audio/mac/audio_synchronized_mac.h"
 #include "media/audio/mac/audio_unified_mac.h"
 #include "media/base/limits.h"
 #include "media/base/media_switches.h"
 
 namespace media {
 
 // Maximum number of output streams that can be open simultaneously.
 static const int kMaxOutputStreams = 50;
 
-// Maximum buffer size that CoreAudio can support, used by low latency path.
-static const int kMaxLowLatencyBufferSize = 2047;
-
 static bool HasAudioHardware(AudioObjectPropertySelector selector) {
   AudioDeviceID output_device_id = kAudioObjectUnknown;
   const AudioObjectPropertyAddress property_address = {
     selector,
     kAudioObjectPropertyScopeGlobal,            // mScope
     kAudioObjectPropertyElementMaster           // mElement
   };
   UInt32 output_device_id_size = static_cast<UInt32>(sizeof(output_device_id));
   OSStatus err = AudioObjectGetPropertyData(kAudioObjectSystemObject,
                                             &property_address,
@@ skipping 288 matching lines @@
   if (audio_device_id != kAudioObjectUnknown)
     stream = new AUAudioInputStream(this, params, audio_device_id);
 
   return stream;
 }
 
 AudioManager* CreateAudioManager() {
   return new AudioManagerMac();
 }
 
-AudioParameters AudioManagerMac::GetPreferredLowLatencyOutputStreamParameters(
-    const AudioParameters& params) {
-  // Applications should use their own preferred buffer size when no resampler
-  // is needed, and Apple CoreAudio can accept any buffer size up to 2047.
-  int native_sample_rate = GetAudioHardwareSampleRate();
-  int buffer_size = GetAudioHardwareBufferSize();
-  if (native_sample_rate == params.sample_rate() &&
-      params.frames_per_buffer() <= kMaxLowLatencyBufferSize) {
-    buffer_size = params.frames_per_buffer();
-  }
-
-  return AudioParameters(AudioParameters::AUDIO_PCM_LOW_LATENCY,
-                         params.channel_layout(),
-                         native_sample_rate,
-                         16,
-                         buffer_size);
-}
-
 }  // namespace media