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      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 // Default output and input volume.
     16 const double kOutputVolumePercent = 100.0;
     17 const double kInputGainPercent = 100.0;
     18 
     19 // Returns a pointer to the device in |devices| with ID |node_id|, or NULL if it
     20 // isn't present.
     21 const chromeos::AudioDevice* GetDevice(const chromeos::AudioDeviceList& devices,
     22                                        uint64 node_id) {
     23   for (chromeos::AudioDeviceList::const_iterator it = devices.begin();
     24        it != devices.end(); ++it) {
     25     if (it->id == node_id)
     26       return &(*it);
     27   }
     28   return NULL;
     29 }
     30 
     31 }  // namespace
     32 
     33 ShellAudioController::PrefHandler::PrefHandler() {}
     34 
     35 double ShellAudioController::PrefHandler::GetOutputVolumeValue(
     36     const chromeos::AudioDevice* device) {
     37   return kOutputVolumePercent;
     38 }
     39 
     40 double ShellAudioController::PrefHandler::GetInputGainValue(
     41     const chromeos::AudioDevice* device) {
     42   return kInputGainPercent;
     43 }
     44 
     45 void ShellAudioController::PrefHandler::SetVolumeGainValue(
     46     const chromeos::AudioDevice& device,
     47     double value) {
     48   // TODO(derat): Shove volume and mute prefs into a map so we can at least
     49   // honor changes that are made at runtime.
     50 }
     51 
     52 bool ShellAudioController::PrefHandler::GetMuteValue(
     53     const chromeos::AudioDevice& device) {
     54   return false;
     55 }
     56 
     57 void ShellAudioController::PrefHandler::SetMuteValue(
     58     const chromeos::AudioDevice& device,
     59     bool mute_on) {}
     60 
     61 bool ShellAudioController::PrefHandler::GetAudioCaptureAllowedValue() {
     62   return true;
     63 }
     64 
     65 bool ShellAudioController::PrefHandler::GetAudioOutputAllowedValue() {
     66   return true;
     67 }
     68 
     69 void ShellAudioController::PrefHandler::AddAudioPrefObserver(
     70     chromeos::AudioPrefObserver* observer) {}
     71 
     72 void ShellAudioController::PrefHandler::RemoveAudioPrefObserver(
     73     chromeos::AudioPrefObserver* observer) {}
     74 
     75 ShellAudioController::PrefHandler::~PrefHandler() {}
     76 
     77 ShellAudioController::ShellAudioController() {
     78   chromeos::CrasAudioHandler::Get()->AddAudioObserver(this);
     79   ActivateDevices();
     80 }
     81 
     82 ShellAudioController::~ShellAudioController() {
     83   chromeos::CrasAudioHandler::Get()->RemoveAudioObserver(this);
     84 }
     85 
     86 void ShellAudioController::OnOutputVolumeChanged() {}
     87 
     88 void ShellAudioController::OnOutputMuteChanged() {}
     89 
     90 void ShellAudioController::OnInputGainChanged() {}
     91 
     92 void ShellAudioController::OnInputMuteChanged() {}
     93 
     94 void ShellAudioController::OnAudioNodesChanged() {
     95   VLOG(1) << "Audio nodes changed";
     96   ActivateDevices();
     97 }
     98 
     99 void ShellAudioController::OnActiveOutputNodeChanged() {}
    100 
    101 void ShellAudioController::OnActiveInputNodeChanged() {}
    102 
    103 void ShellAudioController::ActivateDevices() {
    104   chromeos::CrasAudioHandler* handler = chromeos::CrasAudioHandler::Get();
    105   chromeos::AudioDeviceList devices;
    106   handler->GetAudioDevices(&devices);
    107   sort(devices.begin(), devices.end(), chromeos::AudioDeviceCompare());
    108 
    109   uint64 best_input = 0, best_output = 0;
    110   for (chromeos::AudioDeviceList::const_reverse_iterator it = devices.rbegin();
    111        it != devices.rend() && (!best_input || !best_output); ++it) {
    112     // TODO(derat): Need to check |plugged_time|?
    113     if (it->is_input && !best_input)
    114       best_input = it->id;
    115     else if (!it->is_input && !best_output)
    116       best_output = it->id;
    117   }
    118 
    119   if (best_input && best_input != handler->GetPrimaryActiveInputNode()) {
    120     const chromeos::AudioDevice* device = GetDevice(devices, best_input);
    121     DCHECK(device);
    122     VLOG(1) << "Activating input device: " << device->ToString();
    123     handler->SwitchToDevice(*device, true);
    124   }
    125   if (best_output && best_output != handler->GetPrimaryActiveOutputNode()) {
    126     const chromeos::AudioDevice* device = GetDevice(devices, best_output);
    127     DCHECK(device);
    128     VLOG(1) << "Activating output device: " << device->ToString();
    129     handler->SwitchToDevice(*device, true);
    130   }
    131 }
    132 
    133 }  // namespace extensions
    134