mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-18 16:36:56 +03:00
Theodore Abshire
3af3a2caec
Beforehand, if we were parsing a ttml subtitles stored in an mp4, we did not account for the possibility that there would be multiple mdat boxes, each with its own ttml data. In such a case, we would only use the payload from the final mdat. I don't know if having multiple mdat like that is really in the spec, but at least one user has had this problem, and it's a straightforward change to make that doesn't really slow down the text parser at all (since we parse every mdat anyway). Closes #1028 Change-Id: Id782695548cb92f7aa7278843695b670d8c15ff0
99 lines
2.6 KiB
JavaScript
99 lines
2.6 KiB
JavaScript
/**
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* @license
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* Copyright 2016 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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goog.provide('shaka.text.Mp4TtmlParser');
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goog.require('shaka.text.TextEngine');
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goog.require('shaka.text.TtmlTextParser');
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goog.require('shaka.util.Error');
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goog.require('shaka.util.Mp4Parser');
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/**
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* @struct
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* @constructor
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* @implements {shakaExtern.TextParser}
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*/
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shaka.text.Mp4TtmlParser = function() {
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/**
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* @type {!shakaExtern.TextParser}
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* @private
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*/
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this.parser_ = new shaka.text.TtmlTextParser();
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};
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/** @override **/
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shaka.text.Mp4TtmlParser.prototype.parseInit = function(data) {
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var Mp4Parser = shaka.util.Mp4Parser;
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var sawSTPP = false;
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new Mp4Parser()
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.box('moov', Mp4Parser.children)
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.box('trak', Mp4Parser.children)
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.box('mdia', Mp4Parser.children)
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.box('minf', Mp4Parser.children)
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.box('stbl', Mp4Parser.children)
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.fullBox('stsd', Mp4Parser.sampleDescription)
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.box('stpp', function(box) {
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sawSTPP = true;
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}).parse(data);
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if (!sawSTPP) {
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throw 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_TTML);
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}
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};
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/** @override **/
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shaka.text.Mp4TtmlParser.prototype.parseMedia = function(data, time) {
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var Mp4Parser = shaka.util.Mp4Parser;
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var sawMDAT = false;
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var payload = [];
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new Mp4Parser()
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.box('mdat', Mp4Parser.allData(function(data) {
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sawMDAT = true;
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// Join this to any previous payload, in case the mp4 has multiple
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// mdats.
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payload = payload.concat(this.parser_.parseMedia(data.buffer, time));
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}.bind(this))).parse(data);
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if (!sawMDAT) {
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throw 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_TTML);
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}
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return payload;
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};
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shaka.text.TextEngine.registerParser(
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'application/mp4; codecs="stpp"',
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shaka.text.Mp4TtmlParser);
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shaka.text.TextEngine.registerParser(
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'application/mp4; codecs="stpp.TTML.im1t"',
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shaka.text.Mp4TtmlParser);
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