MSE test for two SourceBuffers with clashing bytestream track ids

third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-initsegmentreceived-alg.html

Index: third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-initsegmentreceived-alg.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-initsegmentreceived-alg.html b/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-initsegmentreceived-alg.html
index c7aa122d3dcc9124a6c02c93b3ac10fde0918c85..69ff7bc9af5bbc15c81730d6e9247ddd93c90f77 100644
--- a/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-initsegmentreceived-alg.html
+++ b/third_party/WebKit/LayoutTests/http/tests/media/media-source/mediasource-initsegmentreceived-alg.html
@@ -107,6 +107,46 @@
                 loadMediaAndVerifyAddedTracks(test, mediaElement, segmentInfo, sourceBuffer, mediaData, expectedAudioTrackInfo, expectedVideoTrackInfo, test.step_func_done());
             }, "Track defaults processing in the init segment algorithm (no bytestream ids)");
 
+            mediasource_test(function(test, mediaElement, mediaSource)
+            {
+                var subType = MediaSourceUtil.getSubType(MediaSourceUtil.AUDIO_VIDEO_TYPE);
+                var manifestFilenameA = subType + '/test-a-128k-44100Hz-1ch-manifest.json';
+                var manifestFilenameV = subType + '/test-v-128k-320x240-30fps-10kfr-manifest.json';
+
+                MediaSourceUtil.fetchManifestAndData(test, manifestFilenameA, function(typeA, dataA)
+                {
+                    MediaSourceUtil.fetchManifestAndData(test, manifestFilenameV, function(typeV, dataV)
+                    {
+                        var sourceBufferA = mediaSource.addSourceBuffer(typeA);
+                        var sourceBufferV = mediaSource.addSourceBuffer(typeV);
+                        sourceBufferA.trackDefaults = new TrackDefaultList([new TrackDefault("audio", "", "audio-label-for-track-bsid1", ["main"], "1")]);
+                        sourceBufferV.trackDefaults = new TrackDefaultList([new TrackDefault("video", "", "video-label-for-track-bsid1", ["main"], "1")]);
+
+                        test.expectEvent(mediaElement.audioTracks, "addtrack", "mediaElement.audioTracks addtrack event");
+                        test.expectEvent(mediaElement, "loadedmetadata", "loadedmetadata done.");
+                        test.expectEvent(sourceBufferA, "updateend", "initSegment append ended.");
+                        test.expectEvent(sourceBufferV, "updateend", "initSegment append ended.");
+                        sourceBufferA.appendBuffer(dataA);
+                        sourceBufferV.appendBuffer(dataV);
+                        test.waitForExpectedEvents(function()
+                        {
+                            assert_equals(mediaElement.audioTracks.length, 1, "mediaElement.audioTracks.length");
+                            assert_equals(mediaElement.videoTracks.length, 1, "mediaElement.audioTracks.length");
+                            assert_equals(sourceBufferA.audioTracks.length, 1, "sourceBufferA.audioTracks.length");
+                            assert_equals(sourceBufferA.videoTracks.length, 0, "sourceBufferA.videoTracks.length");
+                            assert_equals(sourceBufferV.audioTracks.length, 0, "sourceBufferV.audioTracks.length");
+                            assert_equals(sourceBufferV.videoTracks.length, 1, "sourceBufferV.videoTracks.length");
+                            // Verify that audio track bytestream id == video track bytestream id == "1"
+                            assert_equals(sourceBufferA.audioTracks[0].label, "audio-label-for-track-bsid1", "audio track bytestream id is 1");
+                            assert_equals(sourceBufferV.videoTracks[0].label, "video-label-for-track-bsid1", "video track bytestream id is 1");
+                            // Track ids generated for media tracks must be unique, even though the tracks have identical bytestream ids.
+                            assert_not_equals(sourceBufferA.audioTracks[0].id, sourceBufferV.videoTracks[0].id, "track ids must be unique");
+                            test.done();
+                        });
+                    });
+                });
+            }, "Two source buffers with clashing bytestream track ids");
+
         </script>
     </body>
 </html>