extensions/shell/browser/shell_audio_controller_chromeos.cc

   1 // Copyright 2014 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 #include "extensions/shell/browser/shell_audio_controller_chromeos.h"
   6
   7 #include <algorithm>
   8
   9 #include "chromeos/audio/audio_device.h"
  10
  11 namespace extensions {
  12
  13 namespace {
  14
  15 // Returns a pointer to the device in |devices| with ID |node_id|, or NULL if it
  16 // isn't present.
  17 const chromeos::AudioDevice* GetDevice(const chromeos::AudioDeviceList& devices,
  18                                        uint64_t node_id) {
  19   for (chromeos::AudioDeviceList::const_iterator it = devices.begin();
  20        it != devices.end(); ++it) {
  21     if (it->id == node_id)
  22       return &(*it);
  23   }
  24   return NULL;
  25 }
  26
  27 }  // namespace
  28
  29 ShellAudioController::ShellAudioController() {
  30   chromeos::CrasAudioHandler::Get()->AddAudioObserver(this);
  31   ActivateDevices();
  32 }
  33
  34 ShellAudioController::~ShellAudioController() {
  35   chromeos::CrasAudioHandler::Get()->RemoveAudioObserver(this);
  36 }
  37
  38 void ShellAudioController::OnOutputNodeVolumeChanged(uint64_t /* node_id */,
  39                                                      int /* volume */) {
  40 }
  41
  42 void ShellAudioController::OnOutputMuteChanged(bool /* mute_on */,
  43                                                bool /* system_adjust */) {}
  44
  45 void ShellAudioController::OnInputNodeGainChanged(uint64_t /* node_id */,
  46                                                   int /* gain */) {
  47 }
  48
  49 void ShellAudioController::OnInputMuteChanged(bool /* mute_on */) {
  50 }
  51
  52 void ShellAudioController::OnAudioNodesChanged() {
  53   VLOG(1) << "Audio nodes changed";
  54   ActivateDevices();
  55 }
  56
  57 void ShellAudioController::OnActiveOutputNodeChanged() {}
  58
  59 void ShellAudioController::OnActiveInputNodeChanged() {}
  60
  61 void ShellAudioController::ActivateDevices() {
  62   chromeos::CrasAudioHandler* handler = chromeos::CrasAudioHandler::Get();
  63   chromeos::AudioDeviceList devices;
  64   handler->GetAudioDevices(&devices);
  65   sort(devices.begin(), devices.end(), chromeos::AudioDeviceCompare());
  66
  67   uint64_t best_input = 0, best_output = 0;
  68   for (chromeos::AudioDeviceList::const_reverse_iterator it = devices.rbegin();
  69        it != devices.rend() && (!best_input || !best_output); ++it) {
  70     // TODO(derat): Need to check |plugged_time|?
  71     if (it->is_input && !best_input)
  72       best_input = it->id;
  73     else if (!it->is_input && !best_output)
  74       best_output = it->id;
  75   }
  76
  77   if (best_input && best_input != handler->GetPrimaryActiveInputNode()) {
  78     const chromeos::AudioDevice* device = GetDevice(devices, best_input);
  79     DCHECK(device);
  80     VLOG(1) << "Activating input device: " << device->ToString();
  81     handler->SwitchToDevice(*device, true);
  82   }
  83   if (best_output && best_output != handler->GetPrimaryActiveOutputNode()) {
  84     const chromeos::AudioDevice* device = GetDevice(devices, best_output);
  85     DCHECK(device);
  86     VLOG(1) << "Activating output device: " << device->ToString();
  87     handler->SwitchToDevice(*device, true);
  88   }
  89 }
  90
  91 }  // namespace extensions