chromeos/audio/audio_device.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROMEOS_AUDIO_AUDIO_DEVICE_H_
   6 #define CHROMEOS_AUDIO_AUDIO_DEVICE_H_
   7
   8 #include <map>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "chromeos/chromeos_export.h"
  14 #include "chromeos/dbus/audio_node.h"
  15
  16 namespace chromeos {
  17
  18 // Ordered from the highest priority to the lowest.
  19 enum AudioDeviceType {
  20   AUDIO_TYPE_HEADPHONE,
  21   AUDIO_TYPE_MIC,
  22   AUDIO_TYPE_USB,
  23   AUDIO_TYPE_BLUETOOTH,
  24   AUDIO_TYPE_HDMI,
  25   AUDIO_TYPE_INTERNAL_SPEAKER,
  26   AUDIO_TYPE_INTERNAL_MIC,
  27   AUDIO_TYPE_OTHER,
  28 };
  29
  30 struct CHROMEOS_EXPORT AudioDevice {
  31   bool is_input;
  32   uint64 id;
  33   std::string display_name;
  34   std::string device_name;
  35   AudioDeviceType type;
  36   uint8 priority;
  37   bool active;
  38   uint64 plugged_time;
  39
  40   AudioDevice();
  41   explicit AudioDevice(const AudioNode& node);
  42   std::string ToString() const;
  43 };
  44
  45 typedef std::vector<AudioDevice> AudioDeviceList;
  46 typedef std::map<uint64, AudioDevice> AudioDeviceMap;
  47
  48 struct AudioDeviceCompare {
  49   // Rules used to discern which device is higher,
  50   // 1.) Device Type:
  51   //       [Headphones/USB/Bluetooh > HDMI > Internal Speakers]
  52   //       [External Mic/USB Mic/Bluetooth > Internal Mic]
  53   // 2.) Device Plugged in Time:
  54   //       [Later > Earlier]
  55   bool operator()(const chromeos::AudioDevice& a,
  56                   const chromeos::AudioDevice& b) const {
  57     if (a.priority < b.priority) {
  58       return true;
  59     } else if (b.priority < a.priority) {
  60       return false;
  61     } else if (a.plugged_time < b.plugged_time) {
  62       return true;
  63     } else {
  64       return false;
  65     }
  66   }
  67 };
  68
  69 }  // namespace chromeos
  70
  71 #endif  // CHROMEOS_AUDIO_AUDIO_DEVICE_H_