Support (E)AC3 passthrough

media/audio/audio_manager_base.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/audio_manager_base.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 118 matching lines @@
   AudioOutputStream* stream;
   switch (params.format()) {
     case AudioParameters::AUDIO_PCM_LINEAR:
       DCHECK(AudioDeviceDescription::IsDefaultDevice(device_id))
           << "AUDIO_PCM_LINEAR supports only the default device.";
       stream = MakeLinearOutputStream(params, log_callback);
       break;
     case AudioParameters::AUDIO_PCM_LOW_LATENCY:
       stream = MakeLowLatencyOutputStream(params, device_id, log_callback);
       break;
+    case AudioParameters::AUDIO_RAW_AC3:
+    case AudioParameters::AUDIO_RAW_EAC3:
+      stream = MakeRawOutputStream(params, device_id, log_callback);
+      break;
     case AudioParameters::AUDIO_FAKE:
       stream = FakeAudioOutputStream::MakeFakeStream(this, params);
       break;
     default:
       stream = NULL;
       break;
   }
 
   if (stream) {
     ++num_output_streams_;
   }
 
   return stream;
 }
 
+AudioOutputStream* AudioManagerBase::MakeRawOutputStream(
+    const AudioParameters& params,
+    const std::string& device_id,
+    const LogCallback& log_callback) {
+  return nullptr;
+}
+
 AudioInputStream* AudioManagerBase::MakeAudioInputStream(
     const AudioParameters& params,
     const std::string& device_id,
     const LogCallback& log_callback) {
   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
 
   if (!params.IsValid() || (params.channels() > kMaxInputChannels) ||
       device_id.empty()) {
     DLOG(ERROR) << "Audio parameters are invalid for device " << device_id;
     return NULL;
@@ skipping 83 matching lines @@
       std::find_if(output_dispatchers_.begin(), output_dispatchers_.end(),
                    CompareByParams(dispatcher_params));
   if (it != output_dispatchers_.end()) {
     delete dispatcher_params;
     return new AudioOutputProxy((*it)->dispatcher.get());
   }
 
   const base::TimeDelta kCloseDelay =
       base::TimeDelta::FromSeconds(kStreamCloseDelaySeconds);
   scoped_refptr<AudioOutputDispatcher> dispatcher;
-  if (output_params.format() != AudioParameters::AUDIO_FAKE) {
+  if (output_params.format() != AudioParameters::AUDIO_FAKE &&
+      !output_params.IsRawFormat()) {
     dispatcher = new AudioOutputResampler(this, params, output_params,
                                           output_device_id,
                                           kCloseDelay);
   } else {
     dispatcher = new AudioOutputDispatcherImpl(this, output_params,
                                                output_device_id,
                                                kCloseDelay);
   }
 
   dispatcher_params->dispatcher = dispatcher;
@@ skipping 114 matching lines @@
 
   return 0;
 }
 
 std::unique_ptr<AudioLog> AudioManagerBase::CreateAudioLog(
     AudioLogFactory::AudioComponent component) {
   return audio_log_factory_->CreateAudioLog(component);
 }
 
 }  // namespace media