Moved AudioUtil static functions to AudioManager interfaces

media/audio/ios/audio_manager_ios.mm

Index: media/audio/ios/audio_manager_ios.mm
diff --git a/media/audio/ios/audio_manager_ios.mm b/media/audio/ios/audio_manager_ios.mm
index 8949b1c711bcdfb9377d069e5c492a0c8b0876cb..00b8d79cb7c275df53814dad8018e89f700cda9e 100644
--- a/media/audio/ios/audio_manager_ios.mm
+++ b/media/audio/ios/audio_manager_ios.mm
@@ -8,9 +8,11 @@
 #import <AVFoundation/AVFoundation.h>
 
 #include "base/sys_info.h"
+#include "media/audio/audio_parameters.h"
 #include "media/audio/fake_audio_input_stream.h"
 #include "media/audio/ios/audio_session_util_ios.h"
 #include "media/audio/mac/audio_input_mac.h"
+#include "media/base/channel_layout.h"
 #include "media/base/limits.h"
 
 namespace media {
@@ -47,6 +49,18 @@ bool AudioManagerIOS::HasAudioInputDevices() {
   return error == kAudioSessionNoError ? audio_input_is_available : false;
 }
 
+AudioParameters AudioManagerIOS::GetInputStreamParameters(
+    const std::string& device_id) {
+  // TODO(xians): figure out the right input sample rate and buffer size to
+  // achieve the best audio performance for iOS devices.
+  // TODO(xians): query the native channel layout for the specific device.
+  static const int kDefaultSampleRate = 48000;
+  static const int kDefaultBufferSize = 2048;
+  return AudioParameters(
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
+      kDefaultSampleRate, 16, kDefaultBufferSize);
+}
+
 AudioOutputStream* AudioManagerIOS::MakeAudioOutputStream(
     const AudioParameters& params) {
   NOTIMPLEMENTED();  // Only input is supported on iOS.
@@ -90,6 +104,22 @@ AudioInputStream* AudioManagerIOS::MakeLowLatencyInputStream(
   return MakeAudioInputStream(params, device_id);
 }
 
+
+AudioParameters AudioManagerIOS::GetPreferredOutputStreamParameters(
+    const AudioParameters& input_params) {
+  // TODO(xians): handle the case when input_params is valid.
+  // TODO(xians): figure out the right output sample rate and sample rate to
+  // achieve the best audio performance for iOS devices.
+  static const int kDefaultSampleRate = 48000;
+  static const int kDefaultBufferSize = 2048;
+  if (input_params.IsValid()) {
+    NOTREACHED();
+  }
+  return AudioParameters(
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
+      kDefaultSampleRate, 16, kDefaultBufferSize);
+}
+
 // Called by the stream when it has been released by calling Close().
 void AudioManagerIOS::ReleaseOutputStream(AudioOutputStream* stream) {
   NOTIMPLEMENTED();  // Only input is supported on iOS.