1 files changed, 56 insertions, 0 deletions
diff --git a/dom/media/webvtt/WebVTTParserWrapper.sys.mjs b/dom/media/webvtt/WebVTTParserWrapper.sys.mjs
new file mode 100644
index 0000000000..19cf08ca55
--- /dev/null
+++ b/dom/media/webvtt/WebVTTParserWrapper.sys.mjs
@@ -0,0 +1,56 @@
+/* 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/. */
+
+import { WebVTT } from "resource://gre/modules/vtt.sys.mjs";
+
+export function WebVTTParserWrapper() {
+  // Nothing
+}
+
+WebVTTParserWrapper.prototype = {
+  loadParser(window) {
+    this.parser = new WebVTT.Parser(window, new TextDecoder("utf8"));
+  },
+
+  parse(data) {
+    // We can safely translate the string data to a Uint8Array as we are
+    // guaranteed character codes only from \u0000 => \u00ff
+    var buffer = new Uint8Array(data.length);
+    for (var i = 0; i < data.length; i++) {
+      buffer[i] = data.charCodeAt(i);
+    }
+
+    this.parser.parse(buffer);
+  },
+
+  flush() {
+    this.parser.flush();
+  },
+
+  watch(callback) {
+    this.parser.oncue = callback.onCue;
+    this.parser.onregion = callback.onRegion;
+    this.parser.onparsingerror = function (e) {
+      // Passing the just the error code back is enough for our needs.
+      callback.onParsingError("code" in e ? e.code : -1);
+    };
+  },
+
+  cancel() {
+    this.parser.oncue = null;
+    this.parser.onregion = null;
+    this.parser.onparsingerror = null;
+  },
+
+  convertCueToDOMTree(window, cue) {
+    return WebVTT.convertCueToDOMTree(window, cue.text);
+  },
+
+  processCues(window, cues, overlay, controls) {
+    WebVTT.processCues(window, cues, overlay, controls);
+  },
+
+  classDescription: "Wrapper for the JS WebVTT implementation (vtt.js)",
+  QueryInterface: ChromeUtils.generateQI(["nsIWebVTTParserWrapper"]),
+};