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

media/audio/openbsd/audio_manager_openbsd.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/openbsd/audio_manager_openbsd.h"
 
 #include <fcntl.h>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
@@ skipping 37 matching lines @@
 }
 
 bool AudioManagerOpenBSD::HasAudioOutputDevices() {
   return HasAudioHardware();
 }
 
 bool AudioManagerOpenBSD::HasAudioInputDevices() {
   return HasAudioHardware();
 }
 
-AudioParameters AudioManagerOpenBSD::GetInputStreamParameters(
-    const std::string& device_id) {
+AudioParameters AudioManagerOpenBSD::GetPreferredInputStreamParameters(
+    const std::string& input_device_id,
+    const AudioParameters& input_params) {
   static const int kDefaultInputBufferSize = 1024;
 
+  ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
+  int sample_rate = kDefaultSampleRate;
+  int buffer_size = kDefaultInputBufferSize;
+  int bits_per_sample = 16;
+  if (input_params.IsValid()) {
+    sample_rate = input_params.sample_rate();
+    bits_per_sample = input_params.bits_per_sample();
+    channel_layout = input_params.channel_layout();
+    buffer_size = std::min(buffer_size, input_params.frames_per_buffer());
+  }
+
   int user_buffer_size = GetUserBufferSize();
-  int buffer_size = user_buffer_size ?
-      user_buffer_size : kDefaultInputBufferSize;
+  if (user_buffer_size)
+    buffer_size = user_buffer_size;
 
   return AudioParameters(
-      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
-      kDefaultSampleRate, 16, buffer_size);
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
+      sample_rate, bits_per_sample, buffer_size);
 }
 
 AudioManagerOpenBSD::AudioManagerOpenBSD(AudioLogFactory* audio_log_factory)
     : AudioManagerBase(audio_log_factory),
       pulse_library_is_initialized_(false) {
   SetMaxOutputStreamsAllowed(kMaxOutputStreams);
   StubPathMap paths;
 
   // Check if the pulse library is avialbale.
   paths[kModulePulse].push_back(kPulseLib);
@@ skipping 74 matching lines @@
   return NULL;
 }
 
 // TODO(xians): Merge AudioManagerOpenBSD with AudioManagerPulse;
 // static
 AudioManager* CreateAudioManager(AudioLogFactory* audio_log_factory) {
   return new AudioManagerOpenBSD(audio_log_factory);
 }
 
 }  // namespace media