summaryrefslogtreecommitdiffstats
path: root/dom/media/mediacontrol/MediaControlKeyManager.cpp
blob: ba6ed3a524d12651f3f04e94947cb198df104f3b (plain)
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
/* 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/. */

#include "MediaControlKeyManager.h"

#include "MediaControlUtils.h"
#include "MediaControlService.h"
#include "mozilla/AbstractThread.h"
#include "mozilla/Assertions.h"
#include "mozilla/Logging.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPrefs_media.h"
#include "mozilla/widget/MediaKeysEventSourceFactory.h"
#include "nsContentUtils.h"
#include "nsIObserverService.h"

#undef LOG
#define LOG(msg, ...)                        \
  MOZ_LOG(gMediaControlLog, LogLevel::Debug, \
          ("MediaControlKeyManager=%p, " msg, this, ##__VA_ARGS__))

#undef LOG_INFO
#define LOG_INFO(msg, ...)                  \
  MOZ_LOG(gMediaControlLog, LogLevel::Info, \
          ("MediaControlKeyManager=%p, " msg, this, ##__VA_ARGS__))

#define MEDIA_CONTROL_PREF "media.hardwaremediakeys.enabled"

namespace mozilla::dom {

bool MediaControlKeyManager::IsOpened() const {
  return mEventSource && mEventSource->IsOpened();
}

bool MediaControlKeyManager::Open() {
  if (IsOpened()) {
    return true;
  }
  const bool isEnabledMediaControl = StartMonitoringControlKeys();
  if (isEnabledMediaControl) {
    RefPtr<MediaControlService> service = MediaControlService::GetService();
    MOZ_ASSERT(service);
    service->NotifyMediaControlHasEverBeenEnabled();
  }
  return isEnabledMediaControl;
}

void MediaControlKeyManager::Close() {
  // We don't call parent's `Close()` because we want to keep the listener
  // (MediaControlKeyHandler) all the time. It would be manually removed by
  // `MediaControlService` when shutdown.
  StopMonitoringControlKeys();
}

MediaControlKeyManager::MediaControlKeyManager()
    : mObserver(new Observer(this)) {
  nsContentUtils::RegisterShutdownObserver(mObserver);
  Preferences::AddStrongObserver(mObserver, MEDIA_CONTROL_PREF);
}

MediaControlKeyManager::~MediaControlKeyManager() { Shutdown(); }

void MediaControlKeyManager::Shutdown() {
  StopMonitoringControlKeys();
  mEventSource = nullptr;
  if (mObserver) {
    nsContentUtils::UnregisterShutdownObserver(mObserver);
    Preferences::RemoveObserver(mObserver, MEDIA_CONTROL_PREF);
    mObserver = nullptr;
  }
}

bool MediaControlKeyManager::StartMonitoringControlKeys() {
  if (!StaticPrefs::media_hardwaremediakeys_enabled()) {
    return false;
  }

  if (!mEventSource) {
    mEventSource = widget::CreateMediaControlKeySource();
  }
  if (mEventSource && mEventSource->Open()) {
    LOG_INFO("StartMonitoringControlKeys");
    mEventSource->SetPlaybackState(mPlaybackState);
    mEventSource->SetMediaMetadata(mMetadata);
    mEventSource->SetSupportedMediaKeys(mSupportedKeys);
    mEventSource->AddListener(this);
    return true;
  }
  // Fail to open or create event source (eg. when cross-compiling with MinGW,
  // we cannot use the related WinAPI)
  return false;
}

void MediaControlKeyManager::StopMonitoringControlKeys() {
  if (!mEventSource || !mEventSource->IsOpened()) {
    return;
  }

  LOG_INFO("StopMonitoringControlKeys");
  mEventSource->Close();
  if (StaticPrefs::media_mediacontrol_testingevents_enabled()) {
    // Close the source would reset the displayed playback state and metadata.
    if (nsCOMPtr<nsIObserverService> obs = services::GetObserverService()) {
      obs->NotifyObservers(nullptr, "media-displayed-playback-changed",
                           nullptr);
      obs->NotifyObservers(nullptr, "media-displayed-metadata-changed",
                           nullptr);
    }
  }
}

void MediaControlKeyManager::OnActionPerformed(
    const MediaControlAction& aAction) {
  for (auto listener : mListeners) {
    listener->OnActionPerformed(aAction);
  }
}

void MediaControlKeyManager::SetPlaybackState(
    MediaSessionPlaybackState aState) {
  if (mEventSource && mEventSource->IsOpened()) {
    mEventSource->SetPlaybackState(aState);
  }
  mPlaybackState = aState;
  LOG_INFO("playbackState=%s", ToMediaSessionPlaybackStateStr(mPlaybackState));
  if (StaticPrefs::media_mediacontrol_testingevents_enabled()) {
    if (nsCOMPtr<nsIObserverService> obs = services::GetObserverService()) {
      obs->NotifyObservers(nullptr, "media-displayed-playback-changed",
                           nullptr);
    }
  }
}

MediaSessionPlaybackState MediaControlKeyManager::GetPlaybackState() const {
  return (mEventSource && mEventSource->IsOpened())
             ? mEventSource->GetPlaybackState()
             : mPlaybackState;
}

void MediaControlKeyManager::SetMediaMetadata(
    const MediaMetadataBase& aMetadata) {
  if (mEventSource && mEventSource->IsOpened()) {
    mEventSource->SetMediaMetadata(aMetadata);
  }
  mMetadata = aMetadata;
  LOG_INFO("title=%s, artist=%s album=%s",
           NS_ConvertUTF16toUTF8(mMetadata.mTitle).get(),
           NS_ConvertUTF16toUTF8(mMetadata.mArtist).get(),
           NS_ConvertUTF16toUTF8(mMetadata.mAlbum).get());
  if (StaticPrefs::media_mediacontrol_testingevents_enabled()) {
    if (nsCOMPtr<nsIObserverService> obs = services::GetObserverService()) {
      obs->NotifyObservers(nullptr, "media-displayed-metadata-changed",
                           nullptr);
    }
  }
}

void MediaControlKeyManager::SetSupportedMediaKeys(
    const MediaKeysArray& aSupportedKeys) {
  mSupportedKeys.Clear();
  for (const auto& key : aSupportedKeys) {
    LOG_INFO("Supported keys=%s", ToMediaControlKeyStr(key));
    mSupportedKeys.AppendElement(key);
  }
  if (mEventSource && mEventSource->IsOpened()) {
    mEventSource->SetSupportedMediaKeys(mSupportedKeys);
  }
}

void MediaControlKeyManager::SetEnableFullScreen(bool aIsEnabled) {
  LOG_INFO("Set fullscreen %s", aIsEnabled ? "enabled" : "disabled");
  if (mEventSource && mEventSource->IsOpened()) {
    mEventSource->SetEnableFullScreen(aIsEnabled);
  }
}

void MediaControlKeyManager::SetEnablePictureInPictureMode(bool aIsEnabled) {
  LOG_INFO("Set Picture-In-Picture mode %s",
           aIsEnabled ? "enabled" : "disabled");
  if (mEventSource && mEventSource->IsOpened()) {
    mEventSource->SetEnablePictureInPictureMode(aIsEnabled);
  }
}

void MediaControlKeyManager::SetPositionState(
    const Maybe<PositionState>& aState) {
  if (aState) {
    LOG_INFO("Set PositionState, duration=%f, playbackRate=%f, position=%f",
             aState->mDuration, aState->mPlaybackRate,
             aState->mLastReportedPlaybackPosition);
  } else {
    LOG_INFO("Set PositionState, Nothing");
  }

  if (mEventSource && mEventSource->IsOpened()) {
    mEventSource->SetPositionState(aState);
  }
}

void MediaControlKeyManager::OnPreferenceChange() {
  const bool isPrefEnabled = StaticPrefs::media_hardwaremediakeys_enabled();
  // Only start monitoring control keys when the pref is on and having a main
  // controller that means already having media which need to be controlled.
  const bool shouldMonitorKeys =
      isPrefEnabled && MediaControlService::GetService()->GetMainController();
  LOG_INFO("Preference change : %s media control",
           isPrefEnabled ? "enable" : "disable");
  if (shouldMonitorKeys) {
    Unused << StartMonitoringControlKeys();
  } else {
    StopMonitoringControlKeys();
  }
}

NS_IMPL_ISUPPORTS(MediaControlKeyManager::Observer, nsIObserver);

MediaControlKeyManager::Observer::Observer(MediaControlKeyManager* aManager)
    : mManager(aManager) {}

NS_IMETHODIMP
MediaControlKeyManager::Observer::Observe(nsISupports* aSubject,
                                          const char* aTopic,
                                          const char16_t* aData) {
  if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
    mManager->Shutdown();
  } else if (!strcmp(aTopic, "nsPref:changed")) {
    mManager->OnPreferenceChange();
  }
  return NS_OK;
}

}  // namespace mozilla::dom