Properly set loopback device ID for system audio capture.

content/browser/renderer_host/media/audio_input_renderer_host.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 "content/browser/renderer_host/media/audio_input_renderer_host.h"
 
 #include "base/bind.h"
 #include "base/memory/shared_memory.h"
 #include "base/metrics/histogram.h"
 #include "base/process/process.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
 #include "content/browser/renderer_host/media/audio_input_sync_writer.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/renderer_host/media/web_contents_audio_input_stream.h"
 #include "content/browser/renderer_host/media/web_contents_capture_util.h"
 #include "media/audio/audio_manager_base.h"
 
-#if defined(USE_CRAS)
-#include "media/audio/cras/audio_manager_cras.h"
-#endif
-
 namespace content {
 
 struct AudioInputRendererHost::AudioEntry {
   AudioEntry();
   ~AudioEntry();
 
   // The AudioInputController that manages the audio input stream.
   scoped_refptr<media::AudioInputController> controller;
 
   // The audio input stream ID in the render view.
@@ skipping 202 matching lines @@
   if (audio_params.format() != media::AudioParameters::AUDIO_FAKE) {
     const StreamDeviceInfo* info = media_stream_manager_->
         audio_input_device_manager()->GetOpenedDeviceInfoById(session_id);
     if (!info) {
       SendErrorMessage(stream_id);
       DLOG(WARNING) << "No permission has been granted to input stream with "
                     << "session_id=" << session_id;
       return;
     }
 
-    if (info->device.type == content::MEDIA_SYSTEM_AUDIO_CAPTURE) {
-#if defined(USE_CRAS)
-      // Use the special loopback device ID for system audio capture.
-      device_id = media::AudioManagerCras::kLoopbackDeviceId;
-#else
-      SendErrorMessage(stream_id);
-      DLOG(WARNING) << "Loopback device is not supported on this platform";
-      return;
-#endif
-    } else {
-      device_id = info->device.id;
-    }
+    device_id = info->device.id;
   }
 
   // Create a new AudioEntry structure.
   scoped_ptr<AudioEntry> entry(new AudioEntry());
 
   const uint32 segment_size = (sizeof(media::AudioInputBufferParameters) +
                                audio_params.GetBytesPerBuffer());
   entry->shared_memory_segment_count = config.shared_memory_count;
 
   // Create the shared memory and share it with the renderer process
@@ skipping 147 matching lines @@
   // TODO(hclam): Implement a faster look up method.
   for (AudioEntryMap::iterator i = audio_entries_.begin();
        i != audio_entries_.end(); ++i) {
     if (controller == i->second->controller.get())
       return i->second;
   }
   return NULL;
 }
 
 }  // namespace content