Source code

Revision control

Other Tools

/* 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 */
#include "mozilla/dom/MediaControllerBinding.h"
#include "mozilla/dom/MediaMetadata.h"
#include "mozilla/dom/MediaSession.h"
#include "mozilla/dom/MediaSessionBinding.h"
#include "nsISupportsImpl.h"
#include "nsTArray.h"
namespace mozilla {
namespace dom {
// This is used to store seek related properties from MediaSessionActionDetails.
// However, currently we have no plan to support `seekOffset`.
struct SeekDetails {
SeekDetails() = default;
explicit SeekDetails(double aSeekTime) : mSeekTime(aSeekTime) {}
SeekDetails(double aSeekTime, bool aFastSeek)
: mSeekTime(aSeekTime), mFastSeek(aFastSeek) {}
double mSeekTime = 0.0;
bool mFastSeek = false;
struct MediaControlAction {
MediaControlAction() = default;
explicit MediaControlAction(MediaControlKey aKey) : mKey(aKey) {}
MediaControlAction(MediaControlKey aKey, const SeekDetails& aDetails)
: mKey(aKey), mDetails(Some(aDetails)) {}
MediaControlKey mKey = MediaControlKey::EndGuard_;
Maybe<SeekDetails> mDetails;
* MediaControlKeyListener is a pure interface, which is used to monitor
* MediaControlKey, we can add it onto the MediaControlKeySource,
* and then everytime when the media key events occur, `OnActionPerformed` will
* be called so that we can do related handling.
class MediaControlKeyListener {
MediaControlKeyListener() = default;
virtual void OnActionPerformed(const MediaControlAction& aAction) = 0;
virtual ~MediaControlKeyListener() = default;
* MediaControlKeyHandler is used to operate media controller by corresponding
* received media control key events.
class MediaControlKeyHandler final : public MediaControlKeyListener {
NS_INLINE_DECL_REFCOUNTING(MediaControlKeyHandler, override)
void OnActionPerformed(const MediaControlAction& aAction) override;
virtual ~MediaControlKeyHandler() = default;
* MediaControlKeySource is an abstract class which is used to implement
* transporting media control keys event to all its listeners when media keys
* event happens.
class MediaControlKeySource {
using MediaKeysArray = nsTArray<MediaControlKey>;
virtual void AddListener(MediaControlKeyListener* aListener);
virtual void RemoveListener(MediaControlKeyListener* aListener);
size_t GetListenersNum() const;
// Return true if the initialization of the source succeeds, and inherited
// sources should implement this method to handle the initialization fails.
virtual bool Open() = 0;
virtual void Close();
virtual bool IsOpened() const = 0;
* All following `SetXXX()` functions are used to update the playback related
* properties change from a specific tab, which can represent the playback
* status for Firefox instance. Even if we have multiple tabs playing media at
* the same time, we would only update information from one of that tabs that
* would be done by `MediaControlService`.
virtual void SetPlaybackState(MediaSessionPlaybackState aState);
virtual MediaSessionPlaybackState GetPlaybackState() const;
// Override this method if the event source needs to handle the metadata.
virtual void SetMediaMetadata(const MediaMetadataBase& aMetadata) {}
// Set the supported media keys which the event source can use to determine
// what kinds of buttons should be shown on the UI.
virtual void SetSupportedMediaKeys(const MediaKeysArray& aSupportedKeys) = 0;
// Override these methods if the inherited key source want to know the change
// for following attributes. For example, GeckoView would use these methods
// to notify change to the embedded application.
virtual void SetEnableFullScreen(bool aIsEnabled){};
virtual void SetEnablePictureInPictureMode(bool aIsEnabled){};
virtual void SetPositionState(const PositionState& aState){};
virtual ~MediaControlKeySource() = default;
nsTArray<RefPtr<MediaControlKeyListener>> mListeners;
MediaSessionPlaybackState mPlaybackState;
} // namespace dom
} // namespace mozilla