mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Sandra Lokshina
c70367dc97
Closes #796. Closes #923. Change-Id: Ifc2017b40a0fb570103f0fed7bc130aa24819e9f
695 lines
19 KiB
JavaScript
695 lines
19 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.TtmlTextParser');
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goog.require('goog.asserts');
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goog.require('shaka.text.Cue');
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goog.require('shaka.text.TextEngine');
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goog.require('shaka.util.Error');
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goog.require('shaka.util.StringUtils');
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/**
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* @constructor
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* @implements {shakaExtern.TextParser}
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*/
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shaka.text.TtmlTextParser = function() {};
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/** @override */
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shaka.text.TtmlTextParser.prototype.parseInit = function(data) {
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goog.asserts.assert(false, 'TTML does not have init segments');
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};
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/** @override */
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shaka.text.TtmlTextParser.prototype.parseMedia = function(data, time) {
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var str = shaka.util.StringUtils.fromUTF8(data);
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var ret = [];
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var parser = new DOMParser();
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var xml = null;
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try {
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xml = parser.parseFromString(str, 'text/xml');
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} catch (exception) {
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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_XML);
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}
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if (xml) {
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// Try to get the framerate, subFrameRate and frameRateMultiplier
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// if applicable
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var frameRate = null;
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var subFrameRate = null;
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var frameRateMultiplier = null;
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var tickRate = null;
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var spaceStyle = null;
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var tts = xml.getElementsByTagName('tt');
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var tt = tts[0];
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// TTML should always have tt element
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if (!tt) {
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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_XML);
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} else {
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frameRate = tt.getAttribute('ttp:frameRate');
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subFrameRate = tt.getAttribute('ttp:subFrameRate');
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frameRateMultiplier = tt.getAttribute('ttp:frameRateMultiplier');
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tickRate = tt.getAttribute('ttp:tickRate');
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spaceStyle = tt.getAttribute('xml:space') || 'default';
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}
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if (spaceStyle != 'default' && spaceStyle != 'preserve') {
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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_XML);
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}
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var whitespaceTrim = spaceStyle == 'default';
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var rateInfo = new shaka.text.TtmlTextParser.RateInfo_(
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frameRate, subFrameRate, frameRateMultiplier, tickRate);
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var styles = shaka.text.TtmlTextParser.getLeafNodes_(
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tt.getElementsByTagName('styling')[0]);
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var regions = shaka.text.TtmlTextParser.getLeafNodes_(
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tt.getElementsByTagName('layout')[0]);
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var textNodes = shaka.text.TtmlTextParser.getLeafNodes_(
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tt.getElementsByTagName('body')[0]);
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for (var i = 0; i < textNodes.length; i++) {
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var cue = shaka.text.TtmlTextParser.parseCue_(textNodes[i],
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time.periodStart,
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rateInfo,
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styles,
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regions,
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whitespaceTrim);
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if (cue)
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ret.push(cue);
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}
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}
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return ret;
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};
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/**
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* @const
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* @private {!RegExp}
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* @example 00:00:40:07 (7 frames) or 00:00:40:07.1 (7 frames, 1 subframe)
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*/
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shaka.text.TtmlTextParser.timeColonFormatFrames_ =
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/^(\d{2,}):(\d{2}):(\d{2}):(\d{2})\.?(\d+)?$/;
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/**
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* @const
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* @private {!RegExp}
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* @example 00:00:40 or 00:40
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*/
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shaka.text.TtmlTextParser.timeColonFormat_ =
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/^(?:(\d{2,}):)?(\d{2}):(\d{2})$/;
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/**
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* @const
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* @private {!RegExp}
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* example 01:02:43.0345555 or 02:43.03
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*/
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shaka.text.TtmlTextParser.timeColonFormatMilliseconds_ =
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/^(?:(\d{2,}):)?(\d{2}):(\d{2}\.\d{2,})$/;
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/**
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* @const
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* @private {!RegExp}
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* @example 75f or 75.5f
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*/
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shaka.text.TtmlTextParser.timeFramesFormat_ = /^(\d*\.?\d*)f$/;
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/**
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* @const
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* @private {!RegExp}
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* @example 50t or 50.5t
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*/
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shaka.text.TtmlTextParser.timeTickFormat_ = /^(\d*\.?\d*)t$/;
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/**
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* @const
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* @private {!RegExp}
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* @example 3.45h, 3m or 4.20s
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*/
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shaka.text.TtmlTextParser.timeHMSFormat_ =
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/^(?:(\d*\.?\d*)h)?(?:(\d*\.?\d*)m)?(?:(\d*\.?\d*)s)?(?:(\d*\.?\d*)ms)?$/;
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/**
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* @const
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* @private {!RegExp}
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* @example 50% 10%
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*/
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shaka.text.TtmlTextParser.percentValues_ = /^(\d{1,2}|100)% (\d{1,2}|100)%$/;
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/**
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* @const
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* @private {!Object}
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*/
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shaka.text.TtmlTextParser.textAlignToLineAlign_ = {
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'left': 'start',
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'center': 'center',
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'right': 'end',
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'start': 'start',
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'end': 'end'
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};
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/**
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* @const
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* @private {!Object}
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*/
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shaka.text.TtmlTextParser.textAlignToPositionAlign_ = {
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'left': 'line-left',
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'center': 'center',
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'right': 'line-right'
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};
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/**
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* Gets leaf nodes of the xml node tree. Ignores the text, br elements
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* and the spans positioned inside paragraphs
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*
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* @param {Element} element
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* @return {!Array.<!Element>}
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* @private
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*/
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shaka.text.TtmlTextParser.getLeafNodes_ = function(element) {
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var result = [];
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if (!element)
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return result;
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var childNodes = element.childNodes;
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for (var i = 0; i < childNodes.length; i++) {
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// Currently we don't support styles applicable to span
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// elements, so they are ignored
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var isSpanChildOfP = childNodes[i].nodeName == 'span' &&
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element.nodeName == 'p';
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if (childNodes[i].nodeType == Node.ELEMENT_NODE &&
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childNodes[i].nodeName != 'br' && !isSpanChildOfP) {
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// Get the leafs the child might contain
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goog.asserts.assert(childNodes[i] instanceof Element,
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'Node should be Element!');
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var leafChildren = shaka.text.TtmlTextParser.getLeafNodes_(
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/** @type {Element} */(childNodes[i]));
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goog.asserts.assert(leafChildren.length > 0,
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'Only a null Element should return no leaves!');
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result = result.concat(leafChildren);
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}
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}
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// if no result at this point, the element itself must be a leaf
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if (!result.length) {
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result.push(element);
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}
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return result;
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};
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/**
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* Insert \n where <br> tags are found
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*
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* @param {!Node} element
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* @param {boolean} whitespaceTrim
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* @private
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*/
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shaka.text.TtmlTextParser.addNewLines_ = function(element, whitespaceTrim) {
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var childNodes = element.childNodes;
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for (var i = 0; i < childNodes.length; i++) {
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if (childNodes[i].nodeName == 'br' && i > 0) {
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childNodes[i - 1].textContent += '\n';
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} else if (childNodes[i].childNodes.length > 0) {
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shaka.text.TtmlTextParser.addNewLines_(childNodes[i], whitespaceTrim);
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} else if (whitespaceTrim) {
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// Trim leading and trailing whitespace.
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var trimmed = childNodes[i].textContent.trim();
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// Collapse multiple spaces into one.
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trimmed = trimmed.replace(/\s+/g, ' ');
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childNodes[i].textContent = trimmed;
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}
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}
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};
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/**
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* Parses an Element into a TextTrackCue or VTTCue.
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*
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* @param {!Element} cueElement
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* @param {number} offset
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* @param {!shaka.text.TtmlTextParser.RateInfo_} rateInfo
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* @param {!Array.<!Element>} styles
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* @param {!Array.<!Element>} regions
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* @param {boolean} whitespaceTrim
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* @return {shaka.text.Cue}
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* @private
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*/
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shaka.text.TtmlTextParser.parseCue_ = function(
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cueElement, offset, rateInfo, styles, regions, whitespaceTrim) {
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// Disregard empty elements:
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// TTML allows for empty elements like <div></div>.
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// If cueElement has neither time attributes, nor
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// non-whitespace text, don't try to make a cue out of it.
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if (!cueElement.hasAttribute('begin') &&
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!cueElement.hasAttribute('end') &&
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/^\s*$/.test(cueElement.textContent))
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return null;
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shaka.text.TtmlTextParser.addNewLines_(cueElement, whitespaceTrim);
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// Get time
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var start = shaka.text.TtmlTextParser.parseTime_(
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cueElement.getAttribute('begin'), rateInfo);
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var end = shaka.text.TtmlTextParser.parseTime_(
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cueElement.getAttribute('end'), rateInfo);
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var duration = shaka.text.TtmlTextParser.parseTime_(
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cueElement.getAttribute('dur'), rateInfo);
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var payload = cueElement.textContent;
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if (end == null && duration != null)
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end = start + duration;
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if (start == null || end == null) {
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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_TEXT_CUE);
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}
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start += offset;
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end += offset;
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var cue = new shaka.text.Cue(start, end, payload);
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// Get other properties if available
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var region = shaka.text.TtmlTextParser.getElementFromCollection_(
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cueElement, 'region', regions);
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shaka.text.TtmlTextParser.addStyle_(cue, cueElement, region, styles);
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return cue;
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};
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/**
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* Adds applicable style properties to a cue.
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*
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* @param {!shaka.text.Cue} cue
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* @param {!Element} cueElement
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* @param {Element} region
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* @param {!Array.<!Element>} styles
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* @private
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*/
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shaka.text.TtmlTextParser.addStyle_ = function(
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cue, cueElement, region, styles) {
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var TtmlTextParser = shaka.text.TtmlTextParser;
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var Cue = shaka.text.Cue;
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var results = null;
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var extent = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:extent');
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if (extent) {
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results = TtmlTextParser.percentValues_.exec(extent);
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if (results != null) {
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// Use width value of the extent attribute for size.
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// Height value is ignored.
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cue.size = Number(results[1]);
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}
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}
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var writingMode = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:writingMode');
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if (writingMode == 'tb' || writingMode == 'tblr')
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cue.writingDirection = Cue.writingDirection.VERTICAL_LEFT;
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else if (writingMode == 'tbrl')
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cue.writingDirection = Cue.writingDirection.VERTICAL_RIGHT;
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var origin = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:origin');
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if (origin) {
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results = TtmlTextParser.percentValues_.exec(origin);
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if (results != null) {
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// for horizontal text use first coordinate of tts:origin
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// to represent position of the cue and second - for line.
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// Otherwise (vertical), use them the other way around.
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if (cue.writingDirection == Cue.writingDirection.HORIZONTAL) {
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cue.position = Number(results[1]);
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cue.line = Number(results[2]);
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} else {
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cue.position = Number(results[2]);
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cue.line = Number(results[1]);
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}
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cue.lineInterpretation = Cue.lineInterpretation.PERCENTAGE;
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}
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}
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var align = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:textAlign');
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if (align) {
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cue.positionAlign = TtmlTextParser.textAlignToPositionAlign_[align];
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cue.lineAlign = TtmlTextParser.textAlignToLineAlign_[align];
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goog.asserts.assert(align.toUpperCase() in Cue.textAlign,
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align.toUpperCase() +
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' Should be in Cue.textAlign values!');
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cue.textAlign = Cue.textAlign[align.toUpperCase()];
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}
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var displayAlign = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:displayAlign');
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if (displayAlign) {
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goog.asserts.assert(displayAlign.toUpperCase() in Cue.displayAlign,
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displayAlign.toUpperCase() +
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' Should be in Cue.displayAlign values!');
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cue.displayAlign = Cue.displayAlign[displayAlign.toUpperCase()];
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}
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var color = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:color');
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if (color)
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cue.color = color;
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var backgroundColor = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:backgroundColor');
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if (backgroundColor)
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cue.backgroundColor = backgroundColor;
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var fontFamily = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:fontFamily');
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if (fontFamily)
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cue.fontFamily = fontFamily;
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var fontWeight = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:fontWeight');
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if (fontWeight && fontWeight == 'bold')
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cue.fontWeight = Cue.fontWeight.BOLD;
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var wrapOption = TtmlTextParser.getStyleAttribute_(
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cueElement, region, styles, 'tts:wrapOption');
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if (wrapOption && wrapOption == 'noWrap')
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cue.wrapLine = false;
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};
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/**
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* Finds a specified attribute on either the original cue element or its
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* associated region and returns the value if the attribute was found.
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*
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* @param {!Element} cueElement
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* @param {Element} region
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* @param {!Array.<!Element>} styles
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* @param {string} attribute
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* @return {?string}
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* @private
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*/
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shaka.text.TtmlTextParser.getStyleAttribute_ = function(
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cueElement, region, styles, attribute) {
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// An attribute can be specified on region level or in a styling block
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// associated with the region or original element.
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var regionChildren = shaka.text.TtmlTextParser.getLeafNodes_(region);
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for (var i = 0; i < regionChildren.length; i++) {
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var attr = regionChildren[i].getAttribute(attribute);
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if (attr)
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return attr;
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}
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var getElementFromCollection_ =
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shaka.text.TtmlTextParser.getElementFromCollection_;
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var style = getElementFromCollection_(region, 'style', styles) ||
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getElementFromCollection_(cueElement, 'style', styles);
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if (style)
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return style.getAttribute(attribute);
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return null;
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};
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/**
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* Selects an item from |collection| whose id matches |attributeName|
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* from |element|.
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*
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* @param {Element} element
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* @param {string} attributeName
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* @param {!Array.<Element>} collection
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* @return {Element}
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* @private
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*/
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shaka.text.TtmlTextParser.getElementFromCollection_ = function(
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element, attributeName, collection) {
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if (!element || collection.length < 1) {
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return null;
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}
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var item = null;
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var itemName = shaka.text.TtmlTextParser.getInheritedAttribute_(
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element, attributeName);
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if (itemName) {
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for (var i = 0; i < collection.length; i++) {
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if (collection[i].getAttribute('xml:id') == itemName) {
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item = collection[i];
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break;
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}
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}
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}
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return item;
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};
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/**
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* Traverses upwards from a given node until a given attribute is found.
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*
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* @param {!Element} element
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* @param {string} attributeName
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* @return {?string}
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* @private
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*/
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shaka.text.TtmlTextParser.getInheritedAttribute_ = function(
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element, attributeName) {
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var ret = null;
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while (element) {
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ret = element.getAttribute(attributeName);
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if (ret) {
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break;
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}
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// Element.parentNode can lead to XMLDocument, which is not an Element and
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// has no getAttribute().
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var parentNode = element.parentNode;
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if (parentNode instanceof Element) {
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element = parentNode;
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} else {
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break;
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}
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}
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return ret;
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};
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/**
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* Parses a TTML time from the given word.
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*
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* @param {string} text
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* @param {!shaka.text.TtmlTextParser.RateInfo_} rateInfo
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* @return {?number}
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* @private
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*/
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shaka.text.TtmlTextParser.parseTime_ = function(text, rateInfo) {
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var ret = null;
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var TtmlTextParser = shaka.text.TtmlTextParser;
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|
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if (TtmlTextParser.timeColonFormatFrames_.test(text)) {
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ret = TtmlTextParser.parseColonTimeWithFrames_(rateInfo, text);
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} else if (TtmlTextParser.timeColonFormat_.test(text)) {
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ret = TtmlTextParser.parseTimeFromRegex_(
|
|
TtmlTextParser.timeColonFormat_, text);
|
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} else if (TtmlTextParser.timeColonFormatMilliseconds_.test(text)) {
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ret = TtmlTextParser.parseTimeFromRegex_(
|
|
TtmlTextParser.timeColonFormatMilliseconds_, text);
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} else if (TtmlTextParser.timeFramesFormat_.test(text)) {
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ret = TtmlTextParser.parseFramesTime_(rateInfo, text);
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|
} else if (TtmlTextParser.timeTickFormat_.test(text)) {
|
|
ret = TtmlTextParser.parseTickTime_(rateInfo, text);
|
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} else if (TtmlTextParser.timeHMSFormat_.test(text)) {
|
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ret = TtmlTextParser.parseTimeFromRegex_(
|
|
TtmlTextParser.timeHMSFormat_, text);
|
|
}
|
|
|
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return ret;
|
|
};
|
|
|
|
|
|
/**
|
|
* Parses a TTML time in frame format
|
|
*
|
|
* @param {!shaka.text.TtmlTextParser.RateInfo_} rateInfo
|
|
* @param {string} text
|
|
* @return {?number}
|
|
* @private
|
|
*/
|
|
shaka.text.TtmlTextParser.parseFramesTime_ = function(rateInfo, text) {
|
|
|
|
// 75f or 75.5f
|
|
var results = shaka.text.TtmlTextParser.timeFramesFormat_.exec(text);
|
|
var frames = Number(results[1]);
|
|
|
|
return frames / rateInfo.frameRate;
|
|
};
|
|
|
|
|
|
/**
|
|
* Parses a TTML time in tick format
|
|
*
|
|
* @param {!shaka.text.TtmlTextParser.RateInfo_} rateInfo
|
|
* @param {string} text
|
|
* @return {?number}
|
|
* @private
|
|
*/
|
|
shaka.text.TtmlTextParser.parseTickTime_ = function(rateInfo, text) {
|
|
|
|
// 50t or 50.5t
|
|
var results = shaka.text.TtmlTextParser.timeTickFormat_.exec(text);
|
|
var ticks = Number(results[1]);
|
|
|
|
return ticks / rateInfo.tickRate;
|
|
};
|
|
|
|
|
|
/**
|
|
* Parses a TTML colon formatted time containing frames
|
|
*
|
|
* @param {!shaka.text.TtmlTextParser.RateInfo_} rateInfo
|
|
* @param {string} text
|
|
* @return {?number}
|
|
* @private
|
|
*/
|
|
shaka.text.TtmlTextParser.parseColonTimeWithFrames_ = function(
|
|
rateInfo, text) {
|
|
|
|
// 01:02:43:07 ('07' is frames) or 01:02:43:07.1 (subframes)
|
|
var results = shaka.text.TtmlTextParser.timeColonFormatFrames_.exec(text);
|
|
|
|
var hours = Number(results[1]);
|
|
var minutes = Number(results[2]);
|
|
var seconds = Number(results[3]);
|
|
var frames = Number(results[4]);
|
|
var subframes = Number(results[5]) || 0;
|
|
|
|
frames += subframes / rateInfo.subFrameRate;
|
|
seconds += frames / rateInfo.frameRate;
|
|
|
|
return seconds + (minutes * 60) + (hours * 3600);
|
|
};
|
|
|
|
|
|
/**
|
|
* Parses a TTML time with a given regex. Expects regex to be some
|
|
* sort of a time-matcher to match hours, minutes, seconds and milliseconds
|
|
*
|
|
* @param {!RegExp} regex
|
|
* @param {string} text
|
|
* @return {?number}
|
|
* @private
|
|
*/
|
|
shaka.text.TtmlTextParser.parseTimeFromRegex_ = function(regex, text) {
|
|
var results = regex.exec(text);
|
|
if (results == null || results[0] == '')
|
|
return null;
|
|
// This capture is optional, but will still be in the array as undefined,
|
|
// default to 0.
|
|
var hours = Number(results[1]) || 0;
|
|
var minutes = Number(results[2]) || 0;
|
|
var seconds = Number(results[3]) || 0;
|
|
var miliseconds = Number(results[4]) || 0;
|
|
|
|
return (miliseconds / 1000) + seconds + (minutes * 60) + (hours * 3600);
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
* Contains information about frame/subframe rate
|
|
* and frame rate multiplier for time in frame format.
|
|
* ex. 01:02:03:04(4 frames) or 01:02:03:04.1(4 frames, 1 subframe)
|
|
*
|
|
* @param {?string} frameRate
|
|
* @param {?string} subFrameRate
|
|
* @param {?string} frameRateMultiplier
|
|
* @param {?string} tickRate
|
|
* @constructor
|
|
* @struct
|
|
* @private
|
|
*/
|
|
shaka.text.TtmlTextParser.RateInfo_ = function(
|
|
frameRate, subFrameRate, frameRateMultiplier, tickRate) {
|
|
|
|
/**
|
|
* @type {number}
|
|
*/
|
|
this.frameRate = Number(frameRate) || 30;
|
|
|
|
/**
|
|
* @type {number}
|
|
*/
|
|
this.subFrameRate = Number(subFrameRate) || 1;
|
|
|
|
/**
|
|
* @type {number}
|
|
*/
|
|
this.tickRate = Number(tickRate);
|
|
if (this.tickRate == 0) {
|
|
if (frameRate)
|
|
this.tickRate = this.frameRate * this.subFrameRate;
|
|
else
|
|
this.tickRate = 1;
|
|
}
|
|
|
|
if (frameRateMultiplier) {
|
|
var multiplierResults = /^(\d+) (\d+)$/g.exec(frameRateMultiplier);
|
|
if (multiplierResults) {
|
|
var numerator = multiplierResults[1];
|
|
var denominator = multiplierResults[2];
|
|
var multiplierNum = numerator / denominator;
|
|
this.frameRate *= multiplierNum;
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
shaka.text.TextEngine.registerParser(
|
|
'application/ttml+xml',
|
|
shaka.text.TtmlTextParser);
|