mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-21 17:07:09 +03:00
enson-choy
6a775e29a4
When unboxing TKHD, the reader read int64 as trackId instead of int32. Thus unable to find matching timescale when doing TFHD unboxing. Therefore when parsing MDAT, the default timescale will be used which is 90000. All CC timestamps will then be incorrect. This also fixes "Shaka Error MEDIA.VIDEO_ERROR (3,,PIPELINE_ERROR_DECODE: Failed to parse H.264 stream)" error when playing DASH MP4 H.264 streams with CEA-608 CC embedded. It's likely that the VDA bundled in Chromium-based browsers have already included EPB detection & prevention. If we let the player to remove the byte, VDA will complain about stream conformance. Closes #3502
90 lines
2.8 KiB
JavaScript
90 lines
2.8 KiB
JavaScript
/*! @license
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* Shaka Player
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* Copyright 2016 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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goog.require('shaka.cea.Mp4CeaParser');
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goog.require('shaka.test.Util');
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goog.require('shaka.util.Error');
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describe('Mp4CeaParser', () => {
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const ceaInitSegmentUri = '/base/test/test/assets/cea-init.mp4';
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const ceaSegmentUri = '/base/test/test/assets/cea-segment.mp4';
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const Util = shaka.test.Util;
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/** @type {!ArrayBuffer} */
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let ceaInitSegment;
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/** @type {!ArrayBuffer} */
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let ceaSegment;
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beforeAll(async () => {
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const responses = await Promise.all([
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shaka.test.Util.fetch(ceaInitSegmentUri),
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shaka.test.Util.fetch(ceaSegmentUri),
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]);
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ceaInitSegment = responses[0];
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ceaSegment = responses[1];
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});
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/**
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* Test only the functionality of removing EPB
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* Expect removeEmu() to return the NALU with correct length
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*
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* Chromium VDA has a strict standard on NALU length
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* It will complain about conformance if the array is malformed
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*
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* If EPB is removed by shifting bytes, it will return the original NALU
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* length, which will fail this test
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*
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* Note that the CEA-608 packet in this test is incomplete
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*/
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it('parses CEA-608 SEI data from MP4 H.264 stream', () => {
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const seiProcessor = new shaka.cea.SeiProcessor();
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const cea608Packet = new Uint8Array([
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0x00, 0x00, 0x03, // Emulation prevention byte
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]);
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const naluData = seiProcessor.removeEmu(cea608Packet);
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expect(naluData).toBeDefined();
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// EPB should be removed by returning new array, not by shifting bytes
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expect(naluData.length).toBe(2);
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});
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it('parses cea data from mp4 stream', () => {
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const cea708Parser = new shaka.cea.Mp4CeaParser();
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const expectedCea708Packet = new Uint8Array([
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0xb5, 0x00, 0x31, 0x47, 0x41, 0x39, 0x34, 0x03,
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0xce, 0xff, 0xfd, 0x94, 0x20, 0xfd, 0x94, 0xae,
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0xfd, 0x91, 0x62, 0xfd, 0x73, 0xf7, 0xfd, 0xe5,
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0xba, 0xfd, 0x91, 0xb9, 0xfd, 0xb0, 0xb0, 0xfd,
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0xba, 0xb0, 0xfd, 0xb0, 0xba, 0xfd, 0xb0, 0x31,
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0xfd, 0xba, 0xb0, 0xfd, 0xb0, 0x80, 0xfd, 0x94,
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0x2c, 0xfd, 0x94, 0x2f, 0xff,
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]);
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cea708Parser.init(ceaInitSegment);
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const cea708Packets = cea708Parser.parse(ceaSegment);
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expect(cea708Packets).toBeDefined();
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expect(cea708Packets.length).toBe(4);
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expect(cea708Packets[cea708Packets.length - 1].packet)
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.toEqual(expectedCea708Packet);
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});
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it('parses an invalid init segment', () => {
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const cea708Parser = new shaka.cea.Mp4CeaParser();
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const expected = Util.jasmineError(new shaka.util.Error(
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shaka.util.Error.Severity.CRITICAL,
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shaka.util.Error.Category.TEXT,
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shaka.util.Error.Code.INVALID_MP4_CEA));
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expect(() => {
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cea708Parser.init(ceaSegment);
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}).toThrow(expected);
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});
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});
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