add audio-buffer-size command line flag support to the input audio for all the platforms

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/android/build_info.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 98 matching lines @@
     device_names->push_back(device);
   }
 }
 
 void AudioManagerAndroid::GetAudioOutputDeviceNames(
     AudioDeviceNames* device_names) {
   // TODO(henrika): enumerate using GetAudioInputDeviceNames().
   AddDefaultDevice(device_names);
 }
 
-AudioParameters AudioManagerAndroid::GetInputStreamParameters(
-    const std::string& device_id) {
+AudioParameters AudioManagerAndroid::GetPreferredInputStreamParameters(
+    const std::string& input_device_id,
+    const AudioParameters& input_params) {
   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
 
   // Use mono as preferred number of input channels on Android to save
   // resources. Using mono also avoids a driver issue seen on Samsung
   // Galaxy S3 and S4 devices. See http://crbug.com/256851 for details.
   JNIEnv* env = AttachCurrentThread();
   ChannelLayout channel_layout = CHANNEL_LAYOUT_MONO;
+  int sample_rate = GetNativeOutputSampleRate();
+  int bits_per_sample = 16;
   int buffer_size = Java_AudioManagerAndroid_getMinInputFrameSize(
       env, GetNativeOutputSampleRate(),
       ChannelLayoutToChannelCount(channel_layout));
   buffer_size = buffer_size <= 0 ? kDefaultInputBufferSize : buffer_size;
   int effects = AudioParameters::NO_EFFECTS;
   effects |= Java_AudioManagerAndroid_shouldUseAcousticEchoCanceler(env) ?
       AudioParameters::ECHO_CANCELLER : AudioParameters::NO_EFFECTS;
 
+  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();
+    buffer_size = GetOptimalOutputFrameSize(
+        sample_rate, ChannelLayoutToChannelCount(channel_layout));
+    effects |= input_params.effects();
+  }
+
   int user_buffer_size = GetUserBufferSize();
   if (user_buffer_size)
     buffer_size = user_buffer_size;
 
-  AudioParameters params(
+  return AudioParameters(
       AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, 0,
-      GetNativeOutputSampleRate(), 16, buffer_size, effects);
-  return params;
+      sample_rate, bits_per_sample, buffer_size, effects);
 }
 
 AudioOutputStream* AudioManagerAndroid::MakeAudioOutputStream(
     const AudioParameters& params,
     const std::string& device_id) {
   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
   AudioOutputStream* stream =
       AudioManagerBase::MakeAudioOutputStream(params, std::string());
   streams_.insert(static_cast<OpenSLESOutputStream*>(stream));
   return stream;
@@ skipping 223 matching lines @@
 
 void AudioManagerAndroid::DoSetMuteOnAudioThread(bool muted) {
   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
   for (OutputStreams::iterator it = streams_.begin();
        it != streams_.end(); ++it) {
     (*it)->SetMute(muted);
   }
 }
 
 }  // namespace media