Share one thread between all AudioOutputControllers instead of creating one per stream.

media/audio/linux/audio_manager_linux.cc

Index: media/audio/linux/audio_manager_linux.cc
diff --git a/media/audio/linux/audio_manager_linux.cc b/media/audio/linux/audio_manager_linux.cc
index 17a1f743cc4f62281dc772ed6a4491e1a99339da..713a753eb39f6768e835f2a0b9d3a55be012cc05 100644
--- a/media/audio/linux/audio_manager_linux.cc
+++ b/media/audio/linux/audio_manager_linux.cc
@@ -4,7 +4,6 @@
 
 #include "media/audio/linux/audio_manager_linux.h"
 
-#include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "media/audio/fake_audio_input_stream.h"
@@ -13,12 +12,6 @@
 #include "media/audio/linux/alsa_wrapper.h"
 #include "media/base/media_switches.h"
 
-
-namespace {
-
-AudioManagerLinux* g_audio_manager = NULL;
-}  // namespace
-
 // Implementation of AudioManager.
 bool AudioManagerLinux::HasAudioOutputDevices() {
   // TODO(ajwong): Make this actually query audio devices.
@@ -56,7 +49,7 @@ AudioOutputStream* AudioManagerLinux::MakeAudioOutputStream(
     return FakeAudioOutputStream::MakeFakeStream();
   }
 
-  if (!initialized_) {
+  if (!initialized()) {
     return NULL;
   }
 
@@ -68,16 +61,14 @@ AudioOutputStream* AudioManagerLinux::MakeAudioOutputStream(
   AlsaPcmOutputStream* stream =
       new AlsaPcmOutputStream(device_name, format, channels, sample_rate,
                               bits_per_sample, wrapper_.get(), this,
-                              audio_thread_.message_loop());
+                              GetMessageLoop());
 
   AutoLock l(lock_);
   active_streams_[stream] = scoped_refptr<AlsaPcmOutputStream>(stream);
   return stream;
 }
 
-AudioManagerLinux::AudioManagerLinux()
-    : audio_thread_("AudioThread"),
-      initialized_(false) {
+AudioManagerLinux::AudioManagerLinux() {
 }
 
 AudioManagerLinux::~AudioManagerLinux() {
@@ -91,7 +82,7 @@ AudioManagerLinux::~AudioManagerLinux() {
 }
 
 void AudioManagerLinux::Init() {
-  initialized_ = audio_thread_.Start();
+  AudioManagerBase::Init();
   wrapper_.reset(new AlsaWrapper());
 }
 
@@ -110,17 +101,7 @@ void AudioManagerLinux::ReleaseOutputStream(AlsaPcmOutputStream* stream) {
   }
 }
 
-// TODO(ajwong): Collapse this with the windows version.
-void DestroyAudioManagerLinux(void* not_used) {
-  delete g_audio_manager;
-  g_audio_manager = NULL;
-}
-
-AudioManager* AudioManager::GetAudioManager() {
-  if (!g_audio_manager) {
-    g_audio_manager = new AudioManagerLinux();
-    g_audio_manager->Init();
-    base::AtExitManager::RegisterCallback(&DestroyAudioManagerLinux, NULL);
-  }
-  return g_audio_manager;
+// static
+AudioManager* AudioManager::CreateAudioManager() {
+  return new AudioManagerLinux();
 }