Add a virtual beamforming audio device on ChromeOS.

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"
-#include "base/stl_util.h"
-#include "media/audio/audio_output_dispatcher.h"
-#include "media/audio/audio_parameters.h"
-#include "media/audio/pulse/pulse_output.h"
-#include "media/audio/pulse/pulse_stubs.h"
-#include "media/base/channel_layout.h"
-#include "media/base/limits.h"
-#include "media/base/media_switches.h"
-
-using media_audio_pulse::kModulePulse;
-using media_audio_pulse::InitializeStubs;
-using media_audio_pulse::StubPathMap;
-
-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;
-
-static const base::FilePath::CharType kPulseLib[] =
-    FILE_PATH_LITERAL("libpulse.so.0");
-
-// Implementation of AudioManager.
-static bool HasAudioHardware() {
-  int fd;
-  const char *file;
-
-  if ((file = getenv("AUDIOCTLDEVICE")) == 0 || *file == '\0')
-    file = "/dev/audioctl";
-
-  if ((fd = open(file, O_RDONLY)) < 0)
-    return false;
-
-  close(fd);
-  return true;
-}
-
-bool AudioManagerOpenBSD::HasAudioOutputDevices() {
-  return HasAudioHardware();
-}
-
-bool AudioManagerOpenBSD::HasAudioInputDevices() {
-  return HasAudioHardware();
-}
-
-AudioParameters AudioManagerOpenBSD::GetInputStreamParameters(
-    const std::string& device_id) {
-  static const int kDefaultInputBufferSize = 1024;
-
-  int user_buffer_size = GetUserBufferSize();
-  int buffer_size = user_buffer_size ?
-      user_buffer_size : kDefaultInputBufferSize;
-
-  return AudioParameters(
-      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
-      kDefaultSampleRate, 16, 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);
-  if (!InitializeStubs(paths)) {
-    DLOG(WARNING) << "Failed on loading the Pulse library and symbols";
-    return;
-  }
-
-  pulse_library_is_initialized_ = true;
-}
-
-AudioManagerOpenBSD::~AudioManagerOpenBSD() {
-  Shutdown();
-}
-
-AudioOutputStream* AudioManagerOpenBSD::MakeLinearOutputStream(
-    const AudioParameters& params) {
-  DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format);
-  return MakeOutputStream(params);
-}
-
-AudioOutputStream* AudioManagerOpenBSD::MakeLowLatencyOutputStream(
-    const AudioParameters& params,
-    const std::string& device_id) {
-  DLOG_IF(ERROR, !device_id.empty()) << "Not implemented!";
-  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format);
-  return MakeOutputStream(params);
-}
-
-AudioInputStream* AudioManagerOpenBSD::MakeLinearInputStream(
-    const AudioParameters& params, const std::string& device_id) {
-  DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format);
-  NOTIMPLEMENTED();
-  return NULL;
-}
-
-AudioInputStream* AudioManagerOpenBSD::MakeLowLatencyInputStream(
-    const AudioParameters& params, const std::string& device_id) {
-  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format);
-  NOTIMPLEMENTED();
-  return NULL;
-}
-
-AudioParameters AudioManagerOpenBSD::GetPreferredOutputStreamParameters(
-    const std::string& output_device_id,
-    const AudioParameters& input_params) {
-  // TODO(tommi): Support |output_device_id|.
-  DLOG_IF(ERROR, !output_device_id.empty()) << "Not implemented!";
-  static const int kDefaultOutputBufferSize = 512;
-
-  ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
-  int sample_rate = kDefaultSampleRate;
-  int buffer_size = kDefaultOutputBufferSize;
-  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();
-  if (user_buffer_size)
-    buffer_size = user_buffer_size;
-
-  return AudioParameters(
-      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
-      sample_rate, bits_per_sample, buffer_size, AudioParameters::NO_EFFECTS);
-}
-
-AudioOutputStream* AudioManagerOpenBSD::MakeOutputStream(
-    const AudioParameters& params) {
-  if (pulse_library_is_initialized_)
-    return new PulseAudioOutputStream(params, this);
-
-  return NULL;
-}
-
-// TODO(xians): Merge AudioManagerOpenBSD with AudioManagerPulse;
-// static
-AudioManager* CreateAudioManager(AudioLogFactory* audio_log_factory) {
-  return new AudioManagerOpenBSD(audio_log_factory);
-}
-
-}  // namespace media