mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-25 17:45:03 +03:00
Jacob Trimble
50938a02a4
These are intermittently used and cannot be verified. Most of our methods can throw a shaka.util.Error, so having it doesn't really add anything. Plus, if we change a function to throw, we'd need to update all their callers to ensure they have an accurate description of what they throw; otherwise we can't trust the directive. Change-Id: I520bd0fc4c33443e967bf5b103ca5aa9e3274884
131 lines
3.6 KiB
JavaScript
131 lines
3.6 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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* @implements {shaka.extern.TextParser}
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*/
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shaka.text.Mp4TtmlParser = class {
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constructor() {
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/**
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* @type {!shaka.extern.TextParser}
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* @private
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*/
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this.parser_ = new shaka.text.TtmlTextParser();
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/** @private {boolean} */
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this.supportsPartial_ = false;
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try {
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const parser = new DOMParser();
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const parsed = parser.parseFromString('<tag></t', 'text/xml');
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this.supportsPartial_ = parsed.getElementsByTagName('tag').length > 0;
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} catch (e) {}
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}
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/** @override **/
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parseInit(data) {
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const Mp4Parser = shaka.util.Mp4Parser;
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let 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', (box) => {
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sawSTPP = true;
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box.parser.stop();
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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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parseFirstCue(data, time) {
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return this.parseMediaInternal_(data, time, /* partial= */ true)[0];
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}
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/** @override **/
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parseMedia(data, time) {
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return this.parseMediaInternal_(data, time, /* partial= */ false);
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}
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/** @override */
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supportsPartial() {
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return this.supportsPartial_;
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}
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/**
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* @param {!Uint8Array} data
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* @param {shaka.extern.TextParser.TimeContext} time
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* @param {boolean} partial
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* @return {!Array.<!shaka.extern.Cue>}
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* @private
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*/
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parseMediaInternal_(data, time, partial) {
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const Mp4Parser = shaka.util.Mp4Parser;
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let sawMDAT = false;
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let payload = [];
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const parser = new Mp4Parser()
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.box('mdat', Mp4Parser.allData((data) => {
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sawMDAT = true;
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if (partial) {
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// Ignore any future MDAT boxes, if a cue has been found.
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payload = [this.parser_.parseFirstCue(data, time)];
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parser.stop();
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} else {
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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, time));
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}
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}));
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parser.parse(data, partial);
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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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};
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shaka.text.TextEngine.registerParser(
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'application/mp4; codecs="stpp"', shaka.text.Mp4TtmlParser);
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shaka.text.TextEngine.registerParser(
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'application/mp4; codecs="stpp.TTML.im1t"', shaka.text.Mp4TtmlParser);
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