Enable pulse as the default IO handling in Chrome

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/metrics/histogram.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_parameters.h"
 #include "media/audio/audio_util.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",
 };
 
+enum LinuxAudioIO {
+  kPulse,
+  kAlsa,
+  kCras,
+  kAudioIOMax  // Must always be last!
+};
+
 // static
 void AudioManagerLinux::ShowLinuxAudioInputSettings() {
   scoped_ptr<base::Environment> env(base::Environment::Create());
   CommandLine command_line(CommandLine::NO_PROGRAM);
   switch (base::nix::GetDesktopEnvironment(env.get())) {
     case base::nix::DESKTOP_ENVIRONMENT_GNOME:
       command_line.SetProgram(base::FilePath("gnome-volume-control"));
       break;
     case base::nix::DESKTOP_ENVIRONMENT_KDE3:
     case base::nix::DESKTOP_ENVIRONMENT_KDE4:
@@ skipping 255 matching lines @@
     device_name = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
         switches::kAlsaInputDevice);
   }
 
   return new AlsaPcmInputStream(this, device_name, params, wrapper_.get());
 }
 
 AudioManager* CreateAudioManager() {
 #if defined(USE_CRAS)
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUseCras)) {
+    UMA_HISTOGRAM_ENUMERATION("Media.LinuxAudioIO", kCras, kAudioIOMax);
     return new AudioManagerCras();
   }
 #endif
 
-#if defined(USE_PULSEAUDIO)
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUsePulseAudio)) {
-    AudioManager* manager = AudioManagerPulse::Create();
-    if (manager)
-      return manager;
+  AudioManager* manager = AudioManagerPulse::Create();
+  if (manager) {
+    UMA_HISTOGRAM_ENUMERATION("Media.LinuxAudioIO", kPulse, kAudioIOMax);
+    return manager;
   }
-#endif
 
+  UMA_HISTOGRAM_ENUMERATION("Media.LinuxAudioIO", kAlsa, kAudioIOMax);
   return new AudioManagerLinux();
 }
 
 }  // namespace media