Ignore trick mode tracks

Issue #538

Change-Id: I47393ccdc189cf55b90e3a8e4239541e817618f9

Author: joeyparrish

lib/dash/dash_parser.js

@@ -695,8 +695,9 @@ shaka.dash.DashParser.prototype.parsePeriod_ = function(
 
   var adaptationSetNodes =
       XmlUtils.findChildren(periodInfo.node, 'AdaptationSet');
-  var adaptationSets =
-      adaptationSetNodes.map(this.parseAdaptationSet_.bind(this, context));
+  var adaptationSets = adaptationSetNodes
+      .map(this.parseAdaptationSet_.bind(this, context))
+      .filter(shaka.util.Functional.isNotNull);
 
   if (adaptationSets.length == 0) {
     throw new shaka.util.Error(
@@ -722,7 +723,7 @@ shaka.dash.DashParser.prototype.parsePeriod_ = function(
  *
  * @param {shaka.dash.DashParser.Context} context
  * @param {!Element} elem The AdaptationSet element.
- * @return {shaka.dash.DashParser.AdaptationInfo}
+ * @return {?shaka.dash.DashParser.AdaptationInfo}
  * @throws shaka.util.Error When there is a parsing error.
  * @private
  */
@@ -773,6 +774,20 @@ shaka.dash.DashParser.prototype.parseAdaptationSet_ = function(context, elem) {
     }
   });
 
+  var essentialProperties = XmlUtils.findChildren(elem, 'EssentialProperty');
+  // ID of real AdaptationSet if this is a trick mode set:
+  var trickModeFor = null;
+  essentialProperties.forEach(function(prop) {
+    var schemeId = prop.getAttribute('schemeIdUri');
+    if (schemeId == 'http://dashif.org/guidelines/trickmode') {
+      trickModeFor = prop.getAttribute('value');
+    }
+  });
+  if (trickModeFor != null) {
+    // Ignore trick mode tracks until we support them fully.
+    return null;
+  }
+
   var contentProtectionElems = XmlUtils.findChildren(elem, 'ContentProtection');
   var contentProtection = shaka.dash.ContentProtection.parseFromAdaptationSet(
       contentProtectionElems, this.config_.dash.customScheme);

test/dash/dash_parser_manifest_unit.js

@@ -906,4 +906,33 @@ describe('DashParser.Manifest', function() {
           }).catch(fail).then(done);
     });
   });
+
+  it('ignores trickmode tracks', function(done) {
+    var manifestText = [
+      '<MPD minBufferTime="PT75S">',
+      '  <Period id="1" duration="PT30S">',
+      '    <AdaptationSet id="1">',
+      '      <Representation>',
+      '        <SegmentTemplate media="1.mp4" duration="1" />',
+      '      </Representation>',
+      '    </AdaptationSet>',
+      '    <AdaptationSet id="2">',
+      '      <EssentialProperty value="1" ',
+      '        schemeIdUri="http://dashif.org/guidelines/trickmode" />',
+      '      <Representation>',
+      '        <SegmentTemplate media="2.mp4" duration="1" />',
+      '      </Representation>',
+      '    </AdaptationSet>',
+      '  </Period>',
+      '</MPD>'
+    ].join('\n');
+
+    fakeNetEngine.setResponseMapAsText({'dummy://foo': manifestText});
+    parser.start('dummy://foo', fakeNetEngine, filterPeriod, fail, onEventSpy)
+        .then(function(manifest) {
+          expect(manifest.periods.length).toBe(1);
+          expect(manifest.periods[0].streamSets.length).toBe(1);
+          expect(manifest.periods[0].streamSets[0].streams.length).toBe(1);
+        }).catch(fail).then(done);
+  });
 });