1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* PluginUtilsWin.cpp - top-level Windows plugin management code */
#include <mmdeviceapi.h>
#include "PluginUtilsWin.h"
#include "PluginModuleParent.h"
#include "mozilla/StaticMutex.h"
namespace mozilla {
namespace plugins {
namespace PluginUtilsWin {
typedef nsTHashtable<nsPtrHashKey<PluginModuleParent>> PluginModuleSet;
StaticMutex sMutex;
class AudioDeviceChangedRunnable : public Runnable
{
public:
explicit AudioDeviceChangedRunnable(const PluginModuleSet* aAudioNotificationSet,
NPAudioDeviceChangeDetailsIPC aChangeDetails) :
mChangeDetails(aChangeDetails)
, mAudioNotificationSet(aAudioNotificationSet)
{}
NS_IMETHOD Run() override
{
StaticMutexAutoLock lock(sMutex);
PLUGIN_LOG_DEBUG(("Notifying %d plugins of audio device change.",
mAudioNotificationSet->Count()));
for (auto iter = mAudioNotificationSet->ConstIter(); !iter.Done(); iter.Next()) {
PluginModuleParent* pluginModule = iter.Get()->GetKey();
pluginModule->SendNPP_SetValue_NPNVaudioDeviceChangeDetails(mChangeDetails);
}
return NS_OK;
}
protected:
NPAudioDeviceChangeDetailsIPC mChangeDetails;
const PluginModuleSet* mAudioNotificationSet;
};
class AudioNotification : public IMMNotificationClient
{
public:
AudioNotification() :
mRefCt(1)
, mIsRegistered(false)
{
HRESULT hr = CoCreateInstance(__uuidof(MMDeviceEnumerator),
NULL, CLSCTX_INPROC_SERVER,
IID_PPV_ARGS(&mDeviceEnum));
if (FAILED(hr)) {
mDeviceEnum = nullptr;
return;
}
hr = mDeviceEnum->RegisterEndpointNotificationCallback(this);
if (FAILED(hr)) {
mDeviceEnum->Release();
mDeviceEnum = nullptr;
return;
}
mIsRegistered = true;
}
~AudioNotification()
{
MOZ_ASSERT(!mIsRegistered,
"Destroying AudioNotification without first calling Unregister");
if (mDeviceEnum) {
mDeviceEnum->Release();
}
}
// IMMNotificationClient Implementation
HRESULT STDMETHODCALLTYPE
OnDefaultDeviceChanged(EDataFlow flow, ERole role, LPCWSTR device_id) override
{
NPAudioDeviceChangeDetailsIPC changeDetails;
changeDetails.flow = (int32_t)flow;
changeDetails.role = (int32_t)role;
changeDetails.defaultDevice = device_id ? std::wstring(device_id) : L"";
// Make sure that plugin is notified on the main thread.
RefPtr<AudioDeviceChangedRunnable> runnable =
new AudioDeviceChangedRunnable(&mAudioNotificationSet, changeDetails);
NS_DispatchToMainThread(runnable);
return S_OK;
}
HRESULT STDMETHODCALLTYPE
OnDeviceAdded(LPCWSTR device_id) override
{
return S_OK;
};
HRESULT STDMETHODCALLTYPE
OnDeviceRemoved(LPCWSTR device_id) override
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE
OnDeviceStateChanged(LPCWSTR device_id, DWORD new_state) override
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE
OnPropertyValueChanged(LPCWSTR device_id, const PROPERTYKEY key) override
{
return S_OK;
}
// IUnknown Implementation
ULONG STDMETHODCALLTYPE
AddRef() override
{
return InterlockedIncrement(&mRefCt);
}
ULONG STDMETHODCALLTYPE
Release() override
{
ULONG ulRef = InterlockedDecrement(&mRefCt);
if (0 == ulRef) {
delete this;
}
return ulRef;
}
HRESULT STDMETHODCALLTYPE
QueryInterface(REFIID riid, VOID **ppvInterface) override
{
if (__uuidof(IUnknown) == riid) {
AddRef();
*ppvInterface = (IUnknown*)this;
} else if (__uuidof(IMMNotificationClient) == riid) {
AddRef();
*ppvInterface = (IMMNotificationClient*)this;
} else {
*ppvInterface = NULL;
return E_NOINTERFACE;
}
return S_OK;
}
/*
* A Valid instance must be Unregistered before Releasing it.
*/
void Unregister()
{
if (mDeviceEnum) {
mDeviceEnum->UnregisterEndpointNotificationCallback(this);
}
mIsRegistered = false;
}
/*
* True whenever the notification server is set to report events to this object.
*/
bool IsRegistered() {
return mIsRegistered;
}
void AddModule(PluginModuleParent* aModule) {
StaticMutexAutoLock lock(sMutex);
mAudioNotificationSet.PutEntry(aModule);
}
void RemoveModule(PluginModuleParent* aModule) {
StaticMutexAutoLock lock(sMutex);
mAudioNotificationSet.RemoveEntry(aModule);
}
/*
* Are any modules registered for audio notifications?
*/
bool HasModules() {
return !mAudioNotificationSet.IsEmpty();
}
private:
bool mIsRegistered; // only used to make sure that Unregister is called before destroying a Valid instance.
LONG mRefCt;
IMMDeviceEnumerator* mDeviceEnum;
// Set of plugin modules that have registered to be notified when the audio device
// changes.
PluginModuleSet mAudioNotificationSet;
}; // class AudioNotification
// callback that gets notified of audio device events, or NULL
AudioNotification* sAudioNotification = nullptr;
nsresult
RegisterForAudioDeviceChanges(PluginModuleParent* aModuleParent, bool aShouldRegister)
{
// Hold the AudioNotification singleton iff there are PluginModuleParents
// that are subscribed to it.
if (aShouldRegister) {
if (!sAudioNotification) {
// We are registering the first module. Create the singleton.
sAudioNotification = new AudioNotification();
if (!sAudioNotification->IsRegistered()) {
PLUGIN_LOG_DEBUG(("Registered for plugin audio device notification failed."));
sAudioNotification->Release();
sAudioNotification = nullptr;
return NS_ERROR_FAILURE;
}
PLUGIN_LOG_DEBUG(("Registered for plugin audio device notification."));
}
sAudioNotification->AddModule(aModuleParent);
}
else if (!aShouldRegister && sAudioNotification) {
sAudioNotification->RemoveModule(aModuleParent);
if (!sAudioNotification->HasModules()) {
// We have removed the last module from the notification mechanism
// so we can destroy the singleton.
PLUGIN_LOG_DEBUG(("Unregistering for plugin audio device notification."));
sAudioNotification->Unregister();
sAudioNotification->Release();
sAudioNotification = nullptr;
}
}
return NS_OK;
}
} // namespace PluginUtilsWin
} // namespace plugins
} // namespace mozilla
|
