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 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::OnOutputVolumeChanged() {}
  39
  40 void ShellAudioController::OnOutputMuteChanged() {}
  41
  42 void ShellAudioController::OnInputGainChanged() {}
  43
  44 void ShellAudioController::OnInputMuteChanged() {}
  45
  46 void ShellAudioController::OnAudioNodesChanged() {
  47   VLOG(1) << "Audio nodes changed";
  48   ActivateDevices();
  49 }
  50
  51 void ShellAudioController::OnActiveOutputNodeChanged() {}
  52
  53 void ShellAudioController::OnActiveInputNodeChanged() {}
  54
  55 void ShellAudioController::ActivateDevices() {
  56   chromeos::CrasAudioHandler* handler = chromeos::CrasAudioHandler::Get();
  57   chromeos::AudioDeviceList devices;
  58   handler->GetAudioDevices(&devices);
  59   sort(devices.begin(), devices.end(), chromeos::AudioDeviceCompare());
  60
  61   uint64 best_input = 0, best_output = 0;
  62   for (chromeos::AudioDeviceList::const_reverse_iterator it = devices.rbegin();
  63        it != devices.rend() && (!best_input || !best_output); ++it) {
  64     // TODO(derat): Need to check |plugged_time|?
  65     if (it->is_input && !best_input)
  66       best_input = it->id;
  67     else if (!it->is_input && !best_output)
  68       best_output = it->id;
  69   }
  70
  71   if (best_input && best_input != handler->GetPrimaryActiveInputNode()) {
  72     const chromeos::AudioDevice* device = GetDevice(devices, best_input);
  73     DCHECK(device);
  74     VLOG(1) << "Activating input device: " << device->ToString();
  75     handler->SwitchToDevice(*device, true);
  76   }
  77   if (best_output && best_output != handler->GetPrimaryActiveOutputNode()) {
  78     const chromeos::AudioDevice* device = GetDevice(devices, best_output);
  79     DCHECK(device);
  80     VLOG(1) << "Activating output device: " << device->ToString();
  81     handler->SwitchToDevice(*device, true);
  82   }
  83 }
  84
  85 }  // namespace extensions