mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-17 16:26:39 +03:00
Muhammad Haris
480d4a801a
This is an MP4 Parser which extracts CEA-708 packets from Fragmented MP4 streams. The Closed Caption Parser (shaka.media.ClosedCaptionParser) will own this MP4 Parser, and will initialize it and call it as shown. As data comes in, the parser will parse this data, and the caption packets data then be returned in a callback (on708Data), as shown. Here, a theoretical decoder (future pull request, mentioned as a Todo comment) will decode and extract the parsed captions from these packets. Issue #2648
59 lines
1.8 KiB
JavaScript
59 lines
1.8 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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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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/** @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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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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