fix: output-restricted event handling for unplayable streams (#1305)

Author: alex-barstow

src/videojs-http-streaming.js

@@ -1017,15 +1017,40 @@ class VhsHandler extends Component {
     });
 
     this.player_.tech_.on('keystatuschange', (e) => {
-      if (e.status === 'output-restricted') {
-        this.playlistController_.excludePlaylist({
-          playlistToExclude: this.playlistController_.media(),
-          error: {
-            message: `DRM keystatus changed to ${e.status}. Playlist will fail to play. ` +
-              'Check for HDCP content.'
-          },
-          playlistExclusionDuration: Infinity
-        });
+      if (e.status !== 'output-restricted') {
+        return;
+      }
+
+      const mainPlaylist = this.playlistController_.main();
+
+      if (!mainPlaylist || !mainPlaylist.playlists) {
+        return;
+      }
+
+      const excludedHDPlaylists = [];
+
+      // Assume all HD streams are unplayable and exclude them from ABR selection
+      mainPlaylist.playlists.forEach(playlist => {
+        if (playlist && playlist.attributes && playlist.attributes.RESOLUTION &&
+            playlist.attributes.RESOLUTION.height >= 720) {
+          if (!playlist.excludeUntil || playlist.excludeUntil < Infinity) {
+
+            playlist.excludeUntil = Infinity;
+            excludedHDPlaylists.push(playlist);
+          }
+        }
+      });
+
+      if (excludedHDPlaylists.length) {
+        videojs.log.warn(
+          'DRM keystatus changed to "output-restricted." Removing the following HD playlists ' +
+          'that will most likely fail to play and clearing the buffer. ' +
+          'This may be due to HDCP restrictions on the stream and the capabilities of the current device.',
+          ...excludedHDPlaylists
+        );
+
+        // Clear the buffer before switching playlists, since it may already contain unplayable segments
+        this.playlistController_.fastQualityChange_();
       }
     });
 

test/videojs-http-streaming.test.js

@@ -4278,11 +4278,20 @@ QUnit.test('configures eme for HLS on source buffer creation', function(assert)
 });
 
 QUnit.test('eme handles keystatuschange where status is output-restricted', function(assert) {
+  const originalWarn = videojs.log.warn;
+  let warning = '';
+  let qualitySwitches = 0;
+
+  videojs.log.warn = (...text) => {
+    warning += [...text].join('');
+  };
+
   this.player.eme = {
     options: {
       previousSetting: 1
     }
   };
+
   this.player.src({
     src: 'manifest/main.m3u8',
     type: 'application/x-mpegURL',
@@ -4295,39 +4304,64 @@ QUnit.test('eme handles keystatuschange where status is output-restricted', func
 
   this.clock.tick(1);
 
-  const media = {
-    attributes: {
-      CODECS: 'avc1.420015, mp4a.40.2c'
+  const playlists = [
+    {
+      attributes: {
+        RESOLUTION: {
+          width: 1280,
+          height: 720
+        }
+      }
     },
-    contentProtection: {
-      keySystem1: {
-        pssh: 'test'
+    {
+      attributes: {
+        RESOLUTION: {
+          width: 1920,
+          height: 1080
+        }
+      }
+    },
+    {
+      attributes: {
+        RESOLUTION: {
+          width: 848,
+          height: 480
+        }
       }
     }
-  };
+  ];
 
   this.player.tech_.vhs.playlists = {
-    main: { playlists: [media] },
-    media: () => media
+    main: { playlists },
+    media: () => playlists[0]
   };
 
-  const excludes = [];
+  this.player.tech_.vhs.playlistController_.main = () => {
+    return {
+      playlists
+    };
+  };
 
-  this.player.tech_.vhs.playlistController_.excludePlaylist = (exclude) => {
-    excludes.push(exclude);
+  this.player.tech_.vhs.playlistController_.fastQualityChange_ = () => {
+    qualitySwitches++;
   };
 
   this.player.tech_.vhs.playlistController_.sourceUpdater_.trigger('createdsourcebuffers');
   this.player.tech_.trigger({type: 'keystatuschange', status: 'output-restricted'});
 
-  assert.deepEqual(excludes, [{
-    playlistExclusionDuration: Infinity,
-    error: {
-      message: 'DRM keystatus changed to output-restricted. Playlist will fail to play. ' +
-        'Check for HDCP content.'
-    },
-    playlistToExclude: undefined
-  }], 'excluded playlist');
+  assert.equal(playlists[0].excludeUntil, Infinity, 'first HD playlist excluded');
+  assert.equal(playlists[1].excludeUntil, Infinity, 'second HD playlist excluded');
+  assert.equal(playlists[2].excludeUntil, undefined, 'non-HD playlist not excluded');
+  assert.equal(qualitySwitches, 1, 'fastQualityChange_ called once');
+  assert.equal(
+    warning,
+    'DRM keystatus changed to "output-restricted." Removing the following HD playlists ' +
+    'that will most likely fail to play and clearing the buffer. ' +
+    'This may be due to HDCP restrictions on the stream and the capabilities of the current device.' +
+    [playlists[0], playlists[1]].join('')
+  );
+
+  videojs.log.warn = originalWarn;
 });
 
 QUnit.test('eme handles keystatuschange where status is usable', function(assert) {