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