src/chrome/browser/extensions/api/audio/audio_service_linux.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 "chrome/browser/extensions/api/audio/audio_service.h"
   6
   7 #include "base/callback.h"
   8 #include "base/memory/weak_ptr.h"
   9 #include "base/observer_list.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/threading/thread_checker.h"
  12 #include "content/public/browser/browser_thread.h"
  13
  14 using content::BrowserThread;
  15
  16 namespace extensions {
  17
  18 using api::audio::OutputDeviceInfo;
  19 using api::audio::InputDeviceInfo;
  20
  21 class AudioServiceImpl : public AudioService {
  22  public:
  23   AudioServiceImpl();
  24   virtual ~AudioServiceImpl();
  25
  26  private:
  27   // Called by listeners to this service to add/remove themselves as observers.
  28   virtual void AddObserver(AudioService::Observer* observer) OVERRIDE;
  29   virtual void RemoveObserver(AudioService::Observer* observer) OVERRIDE;
  30
  31   // Start to query audio device information.
  32   virtual void StartGetInfo(const GetInfoCallback& callback) OVERRIDE;
  33   virtual void SetActiveDevices(const DeviceIdList& device_list) OVERRIDE;
  34   virtual bool SetDeviceProperties(const std::string& device_id,
  35                                    bool muted,
  36                                    int volume,
  37                                    int gain) OVERRIDE;
  38
  39   // List of observers.
  40   ObserverList<AudioService::Observer> observer_list_;
  41
  42   base::ThreadChecker thread_checker_;
  43
  44   // Note: This should remain the last member so it'll be destroyed and
  45   // invalidate the weak pointers before any other members are destroyed.
  46   base::WeakPtrFactory<AudioServiceImpl> weak_ptr_factory_;
  47
  48   DISALLOW_COPY_AND_ASSIGN(AudioServiceImpl);
  49 };
  50
  51 AudioServiceImpl::AudioServiceImpl() : weak_ptr_factory_(this) {
  52   DCHECK(thread_checker_.CalledOnValidThread());
  53 }
  54
  55 AudioServiceImpl::~AudioServiceImpl() {
  56   DCHECK(thread_checker_.CalledOnValidThread());
  57 }
  58
  59 void AudioServiceImpl::AddObserver(AudioService::Observer* observer) {
  60   DCHECK(thread_checker_.CalledOnValidThread());
  61   observer_list_.AddObserver(observer);
  62 }
  63
  64 void AudioServiceImpl::RemoveObserver(AudioService::Observer* observer) {
  65   DCHECK(thread_checker_.CalledOnValidThread());
  66   observer_list_.RemoveObserver(observer);
  67 }
  68
  69 void AudioServiceImpl::StartGetInfo(const GetInfoCallback& callback) {
  70   DCHECK(thread_checker_.CalledOnValidThread());
  71   if (!callback.is_null())
  72     callback.Run(OutputInfo(), InputInfo(), false);
  73 }
  74
  75 void AudioServiceImpl::SetActiveDevices(const DeviceIdList& device_list) {
  76   DCHECK(thread_checker_.CalledOnValidThread());
  77 }
  78
  79 bool AudioServiceImpl::SetDeviceProperties(const std::string& device_id,
  80                                            bool muted,
  81                                            int volume,
  82                                            int gain) {
  83   DCHECK(thread_checker_.CalledOnValidThread());
  84   return false;
  85 }
  86
  87 AudioService* AudioService::CreateInstance() {
  88   return new AudioServiceImpl;
  89 }
  90
  91 }  // namespace extensions