Add a unified audio I/O backend for ChromeOS.

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/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/pulse_output.h"
 #endif
 #if defined(USE_CRAS)
 #include "media/audio/linux/cras_input.h"
 #include "media/audio/linux/cras_output.h"
+#include "media/audio/linux/cras_unified.h"
 #endif
 #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;
 
 // Since "default", "pulse" and "dmix" devices are virtual devices mapped to
@@ skipping 258 matching lines @@
 AudioInputStream* AudioManagerLinux::MakeLowLatencyInputStream(
     const AudioParameters& params, const std::string& device_id) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
   return MakeInputStream(params, device_id);
 }
 
 AudioOutputStream* AudioManagerLinux::MakeOutputStream(
     const AudioParameters& params) {
 #if defined(USE_CRAS)
   if (UseCras()) {
+    // TODO(dgreid): remove once we properly handle input device selection.
+    if (CommandLine::ForCurrentProcess()->HasSwitch(
+        switches::kEnableWebAudioInput)) {
+      return new CrasUnifiedStream(params, this);
+    }
+
     return new CrasOutputStream(params, this);
   }
 #endif
 
 #if defined(USE_PULSEAUDIO)
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUsePulseAudio)) {
     return new PulseAudioOutputStream(params, this);
   }
 #endif
 
@@ skipping 45 matching lines @@
     sample_rate = input_params.sample_rate();
 
   // TODO(dalecurtis): This should include bits per channel and channel layout
   // eventually.
   return AudioParameters(
       AudioParameters::AUDIO_PCM_LOW_LATENCY, input_params.channel_layout(),
       sample_rate, 16, buffer_size);
 }
 
 }  // namespace media