Moved AudioUtil static functions to AudioManager interfaces

media/audio/android/audio_manager_android.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/android/audio_manager_android.h"
 
 #include "base/logging.h"
 #include "media/audio/android/opensles_input.h"
 #include "media/audio/android/opensles_output.h"
 #include "media/audio/audio_manager.h"
-#include "media/audio/audio_util.h"
+#include "media/audio/audio_parameters.h"
 #include "media/audio/fake_audio_input_stream.h"
+#include "media/base/channel_layout.h"
 
 namespace media {
 
 // Maximum number of output streams that can be open simultaneously.
 static const int kMaxOutputStreams = 10;
 
 AudioManager* CreateAudioManager() {
   return new AudioManagerAndroid();
 }
 
@@ skipping 13 matching lines @@
   return true;
 }
 
 void AudioManagerAndroid::GetAudioInputDeviceNames(
     media::AudioDeviceNames* device_names) {
   DCHECK(device_names->empty());
   device_names->push_front(
       media::AudioDeviceName(kDefaultDeviceName, kDefaultDeviceId));
 }
 
-AudioParameters
-AudioManagerAndroid::GetPreferredLowLatencyOutputStreamParameters(
-    const AudioParameters& input_params) {
-  // TODO(leozwang): Android defines the minimal buffer size requirment
-  // we should follow it. From Android 4.1, a new audio low latency api
-  // set was introduced and is under development, we want to take advantage
-  // of it.
-  int buffer_size = GetAudioHardwareBufferSize();
-  if (input_params.frames_per_buffer() < buffer_size)
-    buffer_size = input_params.frames_per_buffer();
-
+AudioParameters AudioManagerAndroid::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 Android devices.
+  // TODO(xians): query the native channel layout for the specific device.
+  static const int kDefaultSampleRate = 16000;
+  static const int kDefaultBufferSize = 1024;
   return AudioParameters(
-      AudioParameters::AUDIO_PCM_LOW_LATENCY, input_params.channel_layout(),
-      input_params.sample_rate(), 16, buffer_size);
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
+      kDefaultSampleRate, 16, kDefaultBufferSize);
 }
 
 AudioOutputStream* AudioManagerAndroid::MakeLinearOutputStream(
       const AudioParameters& params) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
   return new OpenSLESOutputStream(this, params);
 }
 
 AudioOutputStream* AudioManagerAndroid::MakeLowLatencyOutputStream(
       const AudioParameters& params) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
   return new OpenSLESOutputStream(this, params);
 }
 
 AudioInputStream* AudioManagerAndroid::MakeLinearInputStream(
     const AudioParameters& params, const std::string& device_id) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
   return new OpenSLESInputStream(this, params);
 }
 
 AudioInputStream* AudioManagerAndroid::MakeLowLatencyInputStream(
     const AudioParameters& params, const std::string& device_id) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
   return new OpenSLESInputStream(this, params);
 }
 
+AudioParameters AudioManagerAndroid::GetPreferredOutputStreamParameters(
+    const AudioParameters& input_params) {
+  // TODO(xians): figure out the right output sample rate and sample rate to
+  // achieve the best audio performance for Android devices.
+  static const int kDefaultSampleRate = 16000;
+  static const int kDefaultBufferSize = 1024;
+
+  ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
+  int sample_rate = kDefaultSampleRate;
+  int buffer_size = kDefaultBufferSize;
+  int bits_per_sample = 16;
+  int input_channels = 0;
+  if (input_params.IsValid()) {
+    // Use the client's input parameters if they are valid.
+    sample_rate = input_params.sample_rate();
+    bits_per_sample = input_params.bits_per_sample();
+    channel_layout = input_params.channel_layout();
+    input_channels = input_params.input_channels();
+
+    // TODO(leozwang): Android defines the minimal buffer size requirment
+    // we should follow it. From Android 4.1, a new audio low latency api
+    // set was introduced and is under development, we want to take advantage
+    // of it.
+    buffer_size = std::min(buffer_size, input_params.frames_per_buffer());
+  }
+
+  return AudioParameters(
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, input_channels,
+      sample_rate, bits_per_sample, buffer_size);
+}
+
 }  // namespace media