Implement HasInputDevices in CrasAudioManager

chromeos/audio/audio_device.h

 // 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.
 
 #ifndef CHROMEOS_AUDIO_AUDIO_DEVICE_H_
 #define CHROMEOS_AUDIO_AUDIO_DEVICE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 23 matching lines @@
 struct CHROMEOS_EXPORT AudioDevice {
   AudioDevice();
   explicit AudioDevice(const AudioNode& node);
   std::string ToString() const;
 
   // Converts between the string type sent via D-Bus and AudioDeviceType.
   // Static so they can be used by tests.
   static std::string GetTypeString(chromeos::AudioDeviceType type);
   static chromeos::AudioDeviceType GetAudioType(const std::string& node_type);
 
+  // Indicates that an input or output audio device is for simple usage like
+  // playback or recording for user. In contrast, audio device such as
+  // loopback, always on keyword recognition (AOKR), and keyboard mic are
+  // not for simple usage.
+  inline bool IsForSimpleUsage() {

[Daniel Erat, 2015/06/23 14:15:49]

you don't need 'inline' here, and you should use lowercase_with_underscore style
(https://www.chromium.org/developers/coding-style/cpp-dos-and-donts#TOC-Stop-i...):

bool is_for_simple_usage() {
  return ...
}

[cychiang, 2015/06/24 08:11:29]

Done.

+    return (type == AUDIO_TYPE_HEADPHONE ||
+            type == AUDIO_TYPE_INTERNAL_MIC ||
+            type == AUDIO_TYPE_MIC ||
+            type == AUDIO_TYPE_USB ||
+            type == AUDIO_TYPE_BLUETOOTH ||
+            type == AUDIO_TYPE_HDMI ||
+            type == AUDIO_TYPE_INTERNAL_SPEAKER);
+  }
+
   bool is_input;
   uint64 id;
   std::string display_name;
   std::string device_name;
   AudioDeviceType type;
   uint8 priority;
   bool active;
   uint64 plugged_time;
 };
 
@@ skipping 17 matching lines @@
       return true;
     } else {
       return false;
     }
   }
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_AUDIO_AUDIO_DEVICE_H_