make pulseaudio available for all posix platforms because it's not linux only

media/audio/openbsd/audio_manager_openbsd.cc

 // Copyright (c) 2011 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 "base/command_line.h"
+#include "base/stl_util.h"
+#include "media/audio/audio_output_dispatcher.h"
+#include "media/audio/fake_audio_input_stream.h"
+#include "media/audio/fake_audio_output_stream.h"
+#if defined(USE_PULSEAUDIO)
+#include "media/audio/pulse/pulse_output.h"
+#endif
+#include "media/base/limits.h"
+#include "media/base/media_switches.h"
+
+#include <fcntl.h>
+
+// Maximum number of output streams that can be open simultaneously.
+static const size_t kMaxOutputStreams = 50;
+
 // 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() {
-  NOTIMPLEMENTED();
-  return false;
+  return HasAudioHardware();
 }
 
 bool AudioManagerOpenBSD::HasAudioInputDevices() {
-  NOTIMPLEMENTED();
-  return false;
+  return HasAudioHardware();
 }
 
 AudioOutputStream* AudioManagerOpenBSD::MakeAudioOutputStream(
     const AudioParameters& params) {
+  // Early return for testing hook.  Do this before checking for
+  // |initialized_|.
+  if (params.format == AudioParameters::AUDIO_MOCK) {
+    return FakeAudioOutputStream::MakeFakeStream(params);
+  }
+
+  if (!initialized()) {
+    return NULL;
+  }
+
+  // Don't allow opening more than |kMaxOutputStreams| streams.
+  if (active_streams_.size() >= kMaxOutputStreams) {
+    return NULL;
+  }
+
+  AudioOutputStream* stream;
+#if defined(USE_PULSEAUDIO)
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUsePulseAudio)) {
+    stream = new PulseAudioOutputStream(params, this, GetMessageLoop());
+    active_streams_.insert(stream);
+    return stream;
+  }
+#endif
+
   NOTIMPLEMENTED();
   return NULL;
 }
 
 AudioInputStream* AudioManagerOpenBSD::MakeAudioInputStream(
     const AudioParameters& params) {
   NOTIMPLEMENTED();
   return NULL;
 }
 
 AudioManagerOpenBSD::AudioManagerOpenBSD() {
 }
 
 AudioManagerOpenBSD::~AudioManagerOpenBSD() {
+  // Make sure we stop the thread first. If we allow the default destructor to
+  // destroy the members, we may destroy audio streams before stopping the
+  // thread, resulting an unexpected behavior.
+  // This way we make sure activities of the audio streams are all stopped
+  // before we destroy them.
+  audio_thread_.Stop();
+
+  // Free output dispatchers, closing all remaining open streams.
+  output_dispatchers_.clear();
+
+  // Delete all the streams. Have to do it manually, we don't have ScopedSet<>,
+  // and we are not using ScopedVector<> because search there is slow.
+  STLDeleteElements(&active_streams_);
+}
+
+void AudioManagerOpenBSD::Init() {
+  AudioManagerBase::Init();
 }
 
 void AudioManagerOpenBSD::MuteAll() {
   NOTIMPLEMENTED();
 }
 
 void AudioManagerOpenBSD::UnMuteAll() {
   NOTIMPLEMENTED();
 }
 
-bool AudioManagerOpenBSD::IsRecordingInProgress() {
-  NOTIMPLEMENTED();
-  return false;
+void AudioManagerOpenBSD::ReleaseOutputStream(AudioOutputStream* stream) {
+  if (stream) {
+    active_streams_.erase(stream);
+    delete stream;
+  }
 }
 
 // static
 AudioManager* AudioManager::CreateAudioManager() {
   return new AudioManagerOpenBSD();
 }