1 files changed, 61 insertions, 0 deletions
diff --git a/testing/web-platform/tests/common/media.js b/testing/web-platform/tests/common/media.js
new file mode 100644
index 0000000000..800593f534
--- /dev/null
+++ b/testing/web-platform/tests/common/media.js
@@ -0,0 +1,61 @@
+/**
+ * Returns the URL of a supported video source based on the user agent
+ * @param {string} base - media URL without file extension
+ * @returns {string}
+ */
+function getVideoURI(base)
+{
+    var extension = '.mp4';
+
+    var videotag = document.createElement("video");
+
+    if ( videotag.canPlayType )
+    {
+      if (videotag.canPlayType('video/webm; codecs="vp9, opus"') )
+      {
+          extension = '.webm';
+      } else if ( videotag.canPlayType('video/ogg; codecs="theora, vorbis"') )
+      {
+          extension = '.ogv';
+      }
+    }
+
+    return base + extension;
+}
+
+/**
+ * Returns the URL of a supported audio source based on the user agent
+ * @param {string} base - media URL without file extension
+ * @returns {string}
+ */
+function getAudioURI(base)
+{
+    var extension = '.mp3';
+
+    var audiotag = document.createElement("audio");
+
+    if ( audiotag.canPlayType &&
+         audiotag.canPlayType('audio/ogg') )
+    {
+        extension = '.oga';
+    }
+
+    return base + extension;
+}
+
+/**
+ * Returns the MIME type for a media URL based on the file extension.
+ * @param {string} url
+ * @returns {string}
+ */
+function getMediaContentType(url) {
+    var extension = new URL(url, location).pathname.split(".").pop();
+    var map = {
+        "mp4" : "video/mp4",
+        "ogv" : "application/ogg",
+        "webm": "video/webm",
+        "mp3" : "audio/mp3",
+        "oga" : "application/ogg",
+    };
+    return map[extension];
+}