Moved AudioUtil static functions to AudioManager interfaces

media/audio/linux/audio_manager_linux.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/linux/audio_manager_linux.h"
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/logging.h"
 #include "base/nix/xdg_util.h"
 #include "base/process_util.h"
 #include "base/stl_util.h"
 #include "media/audio/audio_output_dispatcher.h"
-#include "media/audio/audio_util.h"
+#include "media/audio/audio_parameters.h"
 #if defined(USE_CRAS)
 #include "media/audio/cras/audio_manager_cras.h"
 #endif
 #include "media/audio/linux/alsa_input.h"
 #include "media/audio/linux/alsa_output.h"
 #include "media/audio/linux/alsa_wrapper.h"
 #if defined(USE_PULSEAUDIO)
 #include "media/audio/pulse/audio_manager_pulse.h"
 #endif
+#include "media/base/channel_layout.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;
 
+// Default sample rate for input and output streams.
+static const int kDefaultSampleRate = 48000;
+
 // Since "default", "pulse" and "dmix" devices are virtual devices mapped to
 // real devices, we remove them from the list to avoiding duplicate counting.
 // In addition, note that we support no more than 2 channels for recording,
 // hence surround devices are not stored in the list.
 static const char* kInvalidAudioInputDevices[] = {
   "default",
   "null",
   "pulse",
   "dmix",
   "surround",
@@ skipping 45 matching lines @@
 void AudioManagerLinux::ShowAudioInputSettings() {
   ShowLinuxAudioInputSettings();
 }
 
 void AudioManagerLinux::GetAudioInputDeviceNames(
     media::AudioDeviceNames* device_names) {
   DCHECK(device_names->empty());
   GetAlsaAudioInputDevices(device_names);
 }
 
+AudioParameters AudioManagerLinux::GetDefaultOutputStreamParameters() {
+  static const int kDefaultOutputBufferSize = 512;
+
+  return AudioParameters(
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
+      kDefaultSampleRate, 16, kDefaultOutputBufferSize);
+}
+
+AudioParameters AudioManagerLinux::GetDefaultInputStreamParameters(
+    const std::string& device_id) {
+  static const int kDefaultInputBufferSize = 1024;
+
+  return AudioParameters(
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
+      kDefaultSampleRate, 16, kDefaultInputBufferSize);
+}
+
 void AudioManagerLinux::GetAlsaAudioInputDevices(
     media::AudioDeviceNames* device_names) {
   // Constants specified by the ALSA API for device hints.
   static const char kPcmInterfaceName[] = "pcm";
   int card = -1;
 
   // Loop through the sound cards to get ALSA device hints.
   while (!wrapper_->CardNext(&card) && card >= 0) {
     void** hints = NULL;
     int error = wrapper_->DeviceNameHint(card, kPcmInterfaceName, &hints);
@@ skipping 185 matching lines @@
   return new AudioManagerLinux();
 }
 
 AudioParameters AudioManagerLinux::GetPreferredLowLatencyOutputStreamParameters(
     const AudioParameters& input_params) {
   // Since Linux doesn't actually have a low latency path the hardware buffer
   // size is quite large in order to prevent glitches with general usage.  Some
   // clients, such as WebRTC, have a more limited use case and work acceptably
   // with a smaller buffer size.  The check below allows clients which want to
   // try a smaller buffer size on Linux to do so.
-  int buffer_size = GetAudioHardwareBufferSize();
-  if (input_params.frames_per_buffer() < buffer_size)
-    buffer_size = input_params.frames_per_buffer();
+  AudioParameters default_params = GetDefaultOutputStreamParameters();
+  int buffer_size = std::min(input_params.frames_per_buffer(),
+                             default_params.frames_per_buffer());
 
   // TODO(dalecurtis): This should include bits per channel and channel layout
   // eventually.
   return AudioParameters(
       AudioParameters::AUDIO_PCM_LOW_LATENCY, input_params.channel_layout(),
       input_params.sample_rate(), 16, buffer_size);
 }
 
 }  // namespace media