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/* 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
* This enum lists all supported behaviors on the media controller.
enum MediaControlKey {
* MediaController is used to control media playback for a tab, and each tab
* would only have one media controller, which can be accessed from the
* canonical browsing context.
[Exposed=Window, ChromeOnly]
interface MediaController : EventTarget {
readonly attribute unsigned long long id;
readonly attribute boolean isActive;
readonly attribute boolean isAudible;
readonly attribute boolean isPlaying;
readonly attribute MediaSessionPlaybackState playbackState;
MediaMetadataInit getMetadata();
[Frozen, Cached, Pure]
readonly attribute sequence<MediaControlKey> supportedKeys;
attribute EventHandler onactivated;
attribute EventHandler ondeactivated;
// Following events would only be dispatched after controller is active.
attribute EventHandler onmetadatachange;
attribute EventHandler onplaybackstatechange;
attribute EventHandler onpositionstatechange;
attribute EventHandler onsupportedkeyschange;
void focus();
void play();
void pause();
void stop();
void prevTrack();
void nextTrack();
void seekBackward();
void seekForward();
void skipAd();
void seekTo(double seekTime, optional boolean fastSeek = false);
namespace MediaControlService {
// This is used to generate fake media control keys event in testing.
void generateMediaControlKey(MediaControlKey aKey);
// This is used to get the media metadata from the current main controller in
// testing.
MediaMetadataInit getCurrentActiveMediaMetadata();
// This is used to get the actual media playback state from the current main
// controller in testing.
MediaSessionPlaybackState getCurrentMediaSessionPlaybackState();