| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset=utf-8> |
| <title>Unknown Track Number in Third Block</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="mediasource-util.js"></script> |
| </head> |
| <body> |
| </body> |
| <script> |
| // Test that an unknown track number in the third webm block triggers the |
| // append error algorithm. |
| // https://w3c.github.io/media-source/#byte-stream-formats |
| // The user agent MUST run the append error algorithm when any combination of |
| // an initialization segment and any contiguous sequence of media segments |
| // satisfies the following conditions: |
| // 1. The number and type (audio, video, text, etc.) of all tracks in the |
| // media segments are not identified. |
| promise_test(async t => { |
| const audio = document.createElement('audio'); |
| audio.controls = true; |
| audio.watcher = new EventWatcher(t, audio, ['error']); |
| document.body.appendChild(audio); |
| |
| const source = new MediaSource(); |
| source.watcher = new EventWatcher(t, source, ['sourceopen']); |
| audio.src = URL.createObjectURL(source); |
| await source.watcher.wait_for('sourceopen'); |
| |
| const resource = await MediaSourceUtil.fetchResourceOfManifest( |
| t, 'webm/test-a-128k-44100Hz-1ch-manifest.json'); |
| assert_implements_optional(MediaSource.isTypeSupported(resource.type), |
| `${resource.type} supported`); |
| |
| const buffer = source.addSourceBuffer(resource.type); |
| buffer.watcher = new EventWatcher(t, buffer, ['error', 'updateend']); |
| // Intentionally append data ending at the end of a cluster having an |
| // invalid track number in a block that is after the second block in the |
| // cluster, because Gecko had a bug that failed to detect some demux errors |
| // in this situation. |
| resource.data = resource.data.subarray(0, resource.cluster_start[1]); |
| // Choose a track number of zero, which is not in the init segment. |
| const track_number = 0; |
| // Set the high bit of an octet, for a single-octet EBML VINT. |
| const track_number_vint = 1 << 7 | track_number; |
| // Skip two bytes for the EBML element ID and data size, and overwrite the |
| // track number. |
| resource.data[Number(resource.block_start[2]) + 2] = track_number_vint; |
| |
| buffer.appendBuffer(resource.data); |
| await Promise.all([ |
| buffer.watcher.wait_for(['error', 'updateend']), |
| audio.watcher.wait_for('error'), |
| ]); |
| }, 'invalid-third-block'); |
| </script> |
| </html> |
