Fix the issue where the active output device is lost after the device suspend/resume without any ac…

chromeos/audio/cras_audio_handler.cc

 // Copyright (c) 2013 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 "chromeos/audio/cras_audio_handler.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/bind.h"
@@ skipping 834 matching lines @@
     if (device.is_input) {
       input_devices_pq_.push(device);
       ++new_input_device_size;
     } else {
       output_devices_pq_.push(device);
       ++new_output_device_size;
     }
   }
 
   // If the previous active device is removed from the new node list,
-  // reset active_output_node_id_.
-  if (!GetDeviceFromId(active_output_node_id_))
+  // or changed to inactive by cras, reset active_output_node_id_.
+  // See crbug.com/478968.
+  const AudioDevice* active_output = GetDeviceFromId(active_output_node_id_);
+  if (!active_output || !active_output->active)
     active_output_node_id_ = 0;
-  if (!GetDeviceFromId(active_input_node_id_))
+  const AudioDevice* active_input = GetDeviceFromId(active_input_node_id_);
+  if (!active_input || !active_input->active)
     active_input_node_id_ = 0;
 
   // If audio nodes change is caused by unplugging some non-active audio
   // devices, the previously set active audio device will stay active.
   // Otherwise, switch to a new active audio device according to their priority.
   if (input_devices_changed &&
       !NonActiveDeviceUnplugged(old_input_device_size,
                                 new_input_device_size,
                                 active_input_node_id_)) {
     // Some devices like chromeboxes don't have the internal audio input. In
@@ skipping 98 matching lines @@
       active_output_node_id_ = 0;
     chromeos::DBusThreadManager::Get()
         ->GetCrasAudioClient()
         ->RemoveActiveOutputNode(node_id);
     if (notify)
       NotifyActiveNodeChanged(false);
   }
 }
 
 }  // namespace chromeos