Combine init datas across Representations

When computing common DRM schemes among representations, we were not
previously combining the init datas.  Because of this, if different
Representations with different PSSHs had their PSSHs in the manifest,
we would only request a license for one of them.

b/25596430

Closes #229

Change-Id: I150f67174df9dc0dbe1c7b32ab7b1a6dea633328

lib/dash/mpd_processor.js

@@ -598,6 +598,7 @@ shaka.dash.MpdProcessor.prototype.updateCommonDrmInfos_ = function(
     for (var j = 0; j < drmInfos.length; ++j) {
       if (commonDrmInfos[i].isCompatible(drmInfos[j])) {
         found = true;
+        commonDrmInfos[i].addInitDatas(drmInfos[j].initDatas);
         break;
       }
     }

spec/mpd_processor_spec.js

@@ -305,6 +305,101 @@ describe('MpdProcessor', function() {
       });
     });
 
+    describe('PSSHs in the manifest', function() {
+      var m;
+      var p;
+      var as;
+      var r1;
+      var r2;
+      var st1;
+      var st2;
+      var cp1;
+      var cp2;
+      var pssh1;
+      var pssh2;
+      var initData1;
+      var initData2;
+
+      beforeEach(function() {
+        m = new mpd.Mpd();
+        p = new mpd.Period();
+        as = new mpd.AdaptationSet();
+        r1 = new mpd.Representation();
+        r2 = new mpd.Representation();
+        st1 = new mpd.SegmentTemplate();
+        st2 = new mpd.SegmentTemplate();
+        cp1 = new mpd.ContentProtection();
+        cp2 = new mpd.ContentProtection();
+        pssh1 = new mpd.CencPssh();
+        pssh2 = new mpd.CencPssh();
+        initData1 = new Uint8Array([0, 1, 2, 3, 4]);
+        initData2 = new Uint8Array([5, 6, 7, 8, 9]);
+
+        pssh1.psshBox = initData1;
+        pssh2.psshBox = initData2;
+
+        cp1.pssh = pssh1;
+        cp2.pssh = pssh2;
+
+        st1.segmentDuration = 5;
+        st1.mediaUrlTemplate = 'asdf';
+
+        st2.segmentDuration = 5;
+        st2.mediaUrlTemplate = 'asdf';
+
+        r1.segmentTemplate = st1;
+        r1.baseUrl = [new goog.Uri('http://example.com')];
+        r1.bandwidth = 250000;
+        r1.mimeType = 'video/mp4';
+        r1.contentProtections = [cp1];
+
+        r2.segmentTemplate = st2;
+        r2.baseUrl = [new goog.Uri('http://example.com')];
+        r2.bandwidth = 500000;
+        r2.mimeType = 'video/mp4';
+        r2.contentProtections = [cp2];
+
+        as.contentType = 'video';
+        as.representations.push(r1);
+        as.representations.push(r2);
+
+        p.start = 0;
+        p.duration = 10;
+        p.adaptationSets.push(as);
+
+        m.periods.push(p);
+        m.url = [new goog.Uri('http://example.com/mpd')];
+
+        processor.interpretContentProtection_ = function(schemeIdUri, cp) {
+          return [{ 'keySystem': 'com.foo', 'licenseServerUrl': 'http://foo' }];
+        };
+      });
+
+      it('are preserved when different', function() {
+        var periodInfo = processor.process(m).periodInfos[0];
+        expect(periodInfo.streamSetInfos.length).toBe(1);
+
+        var ssi = periodInfo.streamSetInfos[0];
+        expect(ssi.drmInfos.length).toBe(1);
+        expect(ssi.drmInfos[0].initDatas.length).toBe(2);
+        expect(ssi.drmInfos[0].initDatas[0].initData).toEqual(initData1);
+        expect(ssi.drmInfos[0].initDatas[1].initData).toEqual(initData2);
+      });
+
+      it('are not duplicated when the same', function() {
+        // Both init datas are now the same.
+        pssh2.psshBox = initData1.slice(0);
+
+        var periodInfo = processor.process(m).periodInfos[0];
+        expect(periodInfo.streamSetInfos.length).toBe(1);
+
+        var ssi = periodInfo.streamSetInfos[0];
+        expect(ssi.drmInfos.length).toBe(1);
+        expect(ssi.drmInfos[0].initDatas.length).toBe(1);
+        expect(ssi.drmInfos[0].initDatas[0].initData).toEqual(initData1);
+      });
+    });
+
     describe('SegmentBase', function() {
       var m;
       var p;