1 files changed, 210 insertions, 0 deletions
diff --git a/dom/media/mediacontrol/ContentPlaybackController.cpp b/dom/media/mediacontrol/ContentPlaybackController.cpp
new file mode 100644
index 0000000000..ba48c0a5ce
--- /dev/null
+++ b/dom/media/mediacontrol/ContentPlaybackController.cpp
@@ -0,0 +1,210 @@
+/* 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 "ContentPlaybackController.h"
+
+#include "MediaControlUtils.h"
+#include "mozilla/dom/ContentMediaController.h"
+#include "mozilla/dom/MediaSession.h"
+#include "mozilla/dom/Navigator.h"
+#include "mozilla/dom/WindowContext.h"
+#include "mozilla/Telemetry.h"
+#include "nsFocusManager.h"
+
+// avoid redefined macro in unified build
+#undef LOG
+#define LOG(msg, ...)                        \
+  MOZ_LOG(gMediaControlLog, LogLevel::Debug, \
+          ("ContentPlaybackController=%p, " msg, this, ##__VA_ARGS__))
+
+namespace mozilla::dom {
+
+ContentPlaybackController::ContentPlaybackController(
+    BrowsingContext* aContext) {
+  MOZ_ASSERT(aContext);
+  mBC = aContext;
+}
+
+MediaSession* ContentPlaybackController::GetMediaSession() const {
+  RefPtr<nsPIDOMWindowOuter> window = mBC->GetDOMWindow();
+  if (!window) {
+    return nullptr;
+  }
+
+  RefPtr<Navigator> navigator = window->GetNavigator();
+  if (!navigator) {
+    return nullptr;
+  }
+
+  return navigator->HasCreatedMediaSession() ? navigator->MediaSession()
+                                             : nullptr;
+}
+
+void ContentPlaybackController::NotifyContentMediaControlKeyReceiver(
+    MediaControlKey aKey) {
+  if (RefPtr<ContentMediaControlKeyReceiver> receiver =
+          ContentMediaControlKeyReceiver::Get(mBC)) {
+    LOG("Handle '%s' in default behavior for BC %" PRIu64,
+        ToMediaControlKeyStr(aKey), mBC->Id());
+    receiver->HandleMediaKey(aKey);
+  }
+}
+
+void ContentPlaybackController::NotifyMediaSession(MediaSessionAction aAction) {
+  MediaSessionActionDetails details;
+  details.mAction = aAction;
+  NotifyMediaSession(details);
+}
+
+void ContentPlaybackController::NotifyMediaSession(
+    const MediaSessionActionDetails& aDetails) {
+  if (RefPtr<MediaSession> session = GetMediaSession()) {
+    LOG("Handle '%s' in media session behavior for BC %" PRIu64,
+        ToMediaSessionActionStr(aDetails.mAction), mBC->Id());
+    MOZ_ASSERT(session->IsActive(), "Notify inactive media session!");
+    session->NotifyHandler(aDetails);
+  }
+}
+
+void ContentPlaybackController::NotifyMediaSessionWhenActionIsSupported(
+    MediaSessionAction aAction) {
+  if (IsMediaSessionActionSupported(aAction)) {
+    NotifyMediaSession(aAction);
+  }
+}
+
+bool ContentPlaybackController::IsMediaSessionActionSupported(
+    MediaSessionAction aAction) const {
+  RefPtr<MediaSession> session = GetMediaSession();
+  return session ? session->IsActive() && session->IsSupportedAction(aAction)
+                 : false;
+}
+
+Maybe<uint64_t> ContentPlaybackController::GetActiveMediaSessionId() const {
+  RefPtr<WindowContext> wc = mBC->GetTopWindowContext();
+  return wc ? wc->GetActiveMediaSessionContextId() : Nothing();
+}
+
+void ContentPlaybackController::Focus() {
+  // Focus is not part of the MediaSession standard, so always use the
+  // default behavior and focus the window currently playing media.
+  if (nsCOMPtr<nsPIDOMWindowOuter> win = mBC->GetDOMWindow()) {
+    nsFocusManager::FocusWindow(win, CallerType::System);
+  }
+}
+
+void ContentPlaybackController::Play() {
+  const MediaSessionAction action = MediaSessionAction::Play;
+  RefPtr<MediaSession> session = GetMediaSession();
+  if (IsMediaSessionActionSupported(action)) {
+    NotifyMediaSession(action);
+  }
+  // We don't want to arbitrarily call play default handler, because we want to
+  // resume the frame which a user really gets interest in, not all media in the
+  // same page. Therefore, we would only call default handler for `play` when
+  // (1) We don't have an active media session (If we have one, the play action
+  // handler should only be triggered on that session)
+  // (2) Active media session without setting action handler for `play`
+  else if (!GetActiveMediaSessionId() || (session && session->IsActive())) {
+    NotifyContentMediaControlKeyReceiver(MediaControlKey::Play);
+  }
+}
+
+void ContentPlaybackController::Pause() {
+  const MediaSessionAction action = MediaSessionAction::Pause;
+  if (IsMediaSessionActionSupported(action)) {
+    NotifyMediaSession(action);
+  } else {
+    NotifyContentMediaControlKeyReceiver(MediaControlKey::Pause);
+  }
+}
+
+void ContentPlaybackController::SeekBackward() {
+  NotifyMediaSessionWhenActionIsSupported(MediaSessionAction::Seekbackward);
+}
+
+void ContentPlaybackController::SeekForward() {
+  NotifyMediaSessionWhenActionIsSupported(MediaSessionAction::Seekforward);
+}
+
+void ContentPlaybackController::PreviousTrack() {
+  NotifyMediaSessionWhenActionIsSupported(MediaSessionAction::Previoustrack);
+}
+
+void ContentPlaybackController::NextTrack() {
+  NotifyMediaSessionWhenActionIsSupported(MediaSessionAction::Nexttrack);
+}
+
+void ContentPlaybackController::SkipAd() {
+  NotifyMediaSessionWhenActionIsSupported(MediaSessionAction::Skipad);
+}
+
+void ContentPlaybackController::Stop() {
+  const MediaSessionAction action = MediaSessionAction::Stop;
+  if (IsMediaSessionActionSupported(action)) {
+    NotifyMediaSession(action);
+  } else {
+    NotifyContentMediaControlKeyReceiver(MediaControlKey::Stop);
+  }
+}
+
+void ContentPlaybackController::SeekTo(double aSeekTime, bool aFastSeek) {
+  MediaSessionActionDetails details;
+  details.mAction = MediaSessionAction::Seekto;
+  details.mSeekTime.Construct(aSeekTime);
+  if (aFastSeek) {
+    details.mFastSeek.Construct(aFastSeek);
+  }
+  if (IsMediaSessionActionSupported(details.mAction)) {
+    NotifyMediaSession(details);
+  }
+}
+
+void ContentMediaControlKeyHandler::HandleMediaControlAction(
+    BrowsingContext* aContext, const MediaControlAction& aAction) {
+  MOZ_ASSERT(aContext);
+  // The web content doesn't exist in this browsing context.
+  if (!aContext->GetDocShell()) {
+    return;
+  }
+  ContentPlaybackController controller(aContext);
+  switch (aAction.mKey) {
+    case MediaControlKey::Focus:
+      controller.Focus();
+      return;
+    case MediaControlKey::Play:
+      controller.Play();
+      return;
+    case MediaControlKey::Pause:
+      controller.Pause();
+      return;
+    case MediaControlKey::Stop:
+      controller.Stop();
+      return;
+    case MediaControlKey::Previoustrack:
+      controller.PreviousTrack();
+      return;
+    case MediaControlKey::Nexttrack:
+      controller.NextTrack();
+      return;
+    case MediaControlKey::Seekbackward:
+      controller.SeekBackward();
+      return;
+    case MediaControlKey::Seekforward:
+      controller.SeekForward();
+      return;
+    case MediaControlKey::Skipad:
+      controller.SkipAd();
+      return;
+    case MediaControlKey::Seekto: {
+      const SeekDetails& details = *aAction.mDetails;
+      controller.SeekTo(details.mSeekTime, details.mFastSeek);
+      return;
+    }
+    default:
+      MOZ_ASSERT_UNREACHABLE("Invalid media control key.");
+  };
+}
+
+}  // namespace mozilla::dom