From a57c8255792e8695240dbd629c5ee1bdece409dc Mon Sep 17 00:00:00 2001
From: Roland Warmerdam <rowno@webspirited.com>
Date: Mon, 10 Feb 2020 00:21:39 -0800
Subject: [PATCH] Add Media Session types

---
 baselines/dom.generated.d.ts      | 54 ++++++++++++++++++++++
 inputfiles/idl/Media Session.widl | 76 +++++++++++++++++++++++++++++++
 inputfiles/idlSources.json        |  4 ++
 package-lock.json                 |  6 +--
 4 files changed, 137 insertions(+), 3 deletions(-)
 create mode 100644 inputfiles/idl/Media Session.widl

diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 6d4e376b8..919b73b49 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -669,6 +669,12 @@ interface MediaEncryptedEventInit extends EventInit {
     initDataType?: string;
 }
 
+interface MediaImage {
+    sizes?: string;
+    src: string;
+    type?: string;
+}
+
 interface MediaKeyMessageEventInit extends EventInit {
     message: ArrayBuffer;
     messageType: MediaKeyMessageType;
@@ -689,11 +695,28 @@ interface MediaKeySystemMediaCapability {
     robustness?: string;
 }
 
+interface MediaMetadataInit {
+    album?: string;
+    artist?: string;
+    artwork?: MediaImage[];
+    title?: string;
+}
+
+interface MediaPositionState {
+    duration?: number;
+    playbackRate?: number;
+    position?: number;
+}
+
 interface MediaQueryListEventInit extends EventInit {
     matches?: boolean;
     media?: string;
 }
 
+interface MediaSessionActionDetails {
+    action: MediaSessionAction;
+}
+
 interface MediaStreamAudioSourceOptions {
     mediaStream: MediaStream;
 }
@@ -10419,6 +10442,18 @@ declare var MediaList: {
     new(): MediaList;
 };
 
+interface MediaMetadata {
+    album: string;
+    artist: string;
+    artwork: ReadonlyArray<MediaImage>;
+    title: string;
+}
+
+declare var MediaMetadata: {
+    prototype: MediaMetadata;
+    new(init?: MediaMetadataInit): MediaMetadata;
+};
+
 interface MediaQueryListEventMap {
     "change": MediaQueryListEvent;
 }
@@ -10453,6 +10488,18 @@ declare var MediaQueryListEvent: {
     new(type: string, eventInitDict?: MediaQueryListEventInit): MediaQueryListEvent;
 };
 
+interface MediaSession {
+    metadata: MediaMetadata | null;
+    playbackState: MediaSessionPlaybackState;
+    setActionHandler(action: MediaSessionAction, handler: MediaSessionActionHandler | null): void;
+    setPositionState(state?: MediaPositionState): void;
+}
+
+declare var MediaSession: {
+    prototype: MediaSession;
+    new(): MediaSession;
+};
+
 interface MediaSourceEventMap {
     "sourceclose": Event;
     "sourceended": Event;
@@ -10897,6 +10944,7 @@ interface Navigator extends MSFileSaver, MSNavigatorDoNotTrack, NavigatorAutomat
     readonly geolocation: Geolocation;
     readonly maxTouchPoints: number;
     readonly mediaDevices: MediaDevices;
+    readonly mediaSession: MediaSession;
     readonly msManipulationViewsEnabled: boolean;
     readonly msMaxTouchPoints: number;
     readonly msPointerEnabled: boolean;
@@ -19290,6 +19338,10 @@ interface MSLaunchUriCallback {
     (): void;
 }
 
+interface MediaSessionActionHandler {
+    (details: MediaSessionActionDetails): void;
+}
+
 interface MutationCallback {
     (mutations: MutationRecord[], observer: MutationObserver): void;
 }
@@ -20126,6 +20178,8 @@ type MediaKeyMessageType = "individualization-request" | "license-release" | "li
 type MediaKeySessionType = "persistent-license" | "temporary";
 type MediaKeyStatus = "expired" | "internal-error" | "output-downscaled" | "output-restricted" | "released" | "status-pending" | "usable";
 type MediaKeysRequirement = "not-allowed" | "optional" | "required";
+type MediaSessionAction = "nexttrack" | "pause" | "play" | "previoustrack" | "seekbackward" | "seekforward" | "seekto" | "skipad" | "stop";
+type MediaSessionPlaybackState = "none" | "paused" | "playing";
 type MediaStreamTrackState = "ended" | "live";
 type NavigationReason = "down" | "left" | "right" | "up";
 type NavigationType = "back_forward" | "navigate" | "prerender" | "reload";
diff --git a/inputfiles/idl/Media Session.widl b/inputfiles/idl/Media Session.widl
new file mode 100644
index 000000000..478a88a59
--- /dev/null
+++ b/inputfiles/idl/Media Session.widl	
@@ -0,0 +1,76 @@
+[Exposed=Window]
+partial interface Navigator {
+  [SameObject] readonly attribute MediaSession mediaSession;
+};
+
+enum MediaSessionPlaybackState {
+  "none",
+  "paused",
+  "playing"
+};
+
+enum MediaSessionAction {
+  "play",
+  "pause",
+  "seekbackward",
+  "seekforward",
+  "previoustrack",
+  "nexttrack",
+  "skipad",
+  "stop",
+  "seekto"
+};
+
+callback MediaSessionActionHandler = void(MediaSessionActionDetails details);
+
+[Exposed=Window]
+interface MediaSession {
+  attribute MediaMetadata? metadata;
+
+  attribute MediaSessionPlaybackState playbackState;
+
+  void setActionHandler(MediaSessionAction action, MediaSessionActionHandler? handler);
+
+  void setPositionState(optional MediaPositionState state = {});
+};
+
+[Exposed=Window]
+interface MediaMetadata {
+  constructor(optional MediaMetadataInit init = {});
+  attribute DOMString title;
+  attribute DOMString artist;
+  attribute DOMString album;
+  attribute FrozenArray<MediaImage> artwork;
+};
+
+dictionary MediaMetadataInit {
+  DOMString title = "";
+  DOMString artist = "";
+  DOMString album = "";
+  sequence<MediaImage> artwork = [];
+};
+
+dictionary MediaImage {
+  required USVString src;
+  DOMString sizes = "";
+  DOMString type = "";
+};
+
+dictionary MediaPositionState {
+  double duration;
+  double playbackRate;
+  double position;
+};
+
+dictionary MediaSessionActionDetails {
+  required MediaSessionAction action;
+};
+
+dictionary MediaSessionSeekActionDetails : MediaSessionActionDetails {
+  double? seekOffset;
+};
+
+dictionary MediaSessionSeekToActionDetails : MediaSessionActionDetails {
+  required double seekTime;
+  boolean? fastSeek;
+};
diff --git a/inputfiles/idlSources.json b/inputfiles/idlSources.json
index bdaec1a19..30aaf98af 100644
--- a/inputfiles/idlSources.json
+++ b/inputfiles/idlSources.json
@@ -358,6 +358,10 @@
         "url": "https://w3c.github.io/mediacapture-main/",
         "title": "Media Capture and Streams"
     },
+    {
+        "url": "https://www.w3.org/TR/mediasession/",
+        "title": "Media Session"
+    },
     {
         "url": "https://www.w3.org/TR/media-source/",
         "title": "Media Source Extensions"
diff --git a/package-lock.json b/package-lock.json
index 7b3424bbb..8482863b8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -877,9 +877,9 @@
       }
     },
     "typescript": {
-      "version": "3.8.0-dev.20191123",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.8.0-dev.20191123.tgz",
-      "integrity": "sha512-1Cz/SejVZuU8F8aYlOS7wfXaBxwQ11iARAkZvwbdHVkFjYiaI3E1f//QKsBiP7IYKZp+J5EEDcUoZxYihw2IqA=="
+      "version": "3.8.0-dev.20200208",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.8.0-dev.20200208.tgz",
+      "integrity": "sha512-/n4f+RIfoHvEmXprHjE7dHzGlDzD0wpqpvHBXBtwaCi1wp8zsGqA07v1UPijR1xBqumO5FFDMEPIuu7fEDJemA=="
     },
     "universalify": {
       "version": "0.1.2",