Implement #767 for custom media only

docs/custom-media.md

@@ -71,8 +71,11 @@ The following MIME types are accepted for the `contentType` field:
   * `video/webm`
   * `video/ogg`
   * `application/x-mpegURL` (HLS streams)
-    - HLS is only supported for livestreams.  Metadata with HLS sources
+    - HLS is only tested with livestreams.  VODs are accepted, but I do not test
+      this functionality.
       but without `live: true` will be rejected.
+  * `application/dash+xml` (DASH streams)
+    - Support for DASH is experimental
   * ~~`rtmp/flv`~~
     - In light of Adobe phasing out support for Flash, and many browsers
       already dropping support, RTMP is not supported by this feature.

src/custom-media.js

@@ -30,8 +30,7 @@ const SOURCE_CONTENT_TYPES = new Set([
 ]);
 
 const LIVE_ONLY_CONTENT_TYPES = new Set([
-    'application/dash+xml',
+    'application/dash+xml'
-    'application/x-mpegURL'
 ]);
 
 export function lookup(url, opts) {

test/custom-media.js

@@ -90,13 +90,13 @@ describe('custom-media', () => {
             assert.throws(() => validate(invalid), /URL protocol must be HTTPS/);
         });
 
-        it('rejects non-live HLS', () => {
+        it('rejects non-live DASH', () => {
             invalid.live = false;
-            invalid.sources[0].contentType = 'application/x-mpegURL';
+            invalid.sources[0].contentType = 'application/dash+xml';
 
             assert.throws(
                 () => validate(invalid),
-                /contentType "application\/x-mpegURL" requires live: true/
+                /contentType "application\/dash\+xml" requires live: true/
             );
         });
     });