shaka-player
Version:
DASH/EME video player library
484 lines (408 loc) • 8.46 kB
JavaScript
/**
* @license
* Copyright 2016 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
goog.provide('shaka.text.Cue');
goog.provide('shaka.text.CueRegion');
/**
* Creates a Cue object.
*
* @param {number} startTime
* @param {number} endTime
* @param {string} payload
*
* @implements {shaka.extern.Cue}
* @constructor
* @struct
* @export
*/
shaka.text.Cue = function(startTime, endTime, payload) {
const Cue = shaka.text.Cue;
/**
* @override
* @exportInterface
*/
this.startTime = startTime;
/**
* @override
* @exportInterface
*/
this.direction = Cue.direction.HORIZONTAL_LEFT_TO_RIGHT;
/**
* @override
* @exportInterface
*/
this.endTime = endTime;
/**
* @override
* @exportInterface
*/
this.payload = payload;
/**
* @override
* @exportInterface
*/
this.region = new shaka.text.CueRegion();
/**
* @override
* @exportInterface
*/
this.position = null;
/**
* @override
* @exportInterface
*/
this.positionAlign = Cue.positionAlign.AUTO;
/**
* @override
* @exportInterface
*/
this.size = 0;
/**
* @override
* @exportInterface
*/
this.textAlign = Cue.textAlign.CENTER;
/**
* @override
* @exportInterface
*/
this.writingMode = Cue.writingMode.HORIZONTAL_TOP_TO_BOTTOM;
/**
* @override
* @exportInterface
*/
this.lineInterpretation = Cue.lineInterpretation.LINE_NUMBER;
/**
* @override
* @exportInterface
*/
this.line = null;
/**
* @override
* @exportInterface
*/
this.lineHeight = '';
/**
* Line Alignment is set to start by default.
* @override
* @exportInterface
*/
this.lineAlign = Cue.lineAlign.START;
/**
* Set the captions at the bottom of the text container by default.
* @override
* @exportInterface
*/
this.displayAlign = Cue.displayAlign.AFTER;
/**
* @override
* @exportInterface
*/
this.color = '';
/**
* @override
* @exportInterface
*/
this.backgroundColor = '';
/**
* @override
* @exportInterface
*/
this.backgroundImage = '';
/**
* @override
* @exportInterface
*/
this.fontSize = '';
/**
* @override
* @exportInterface
*/
this.fontWeight = Cue.fontWeight.NORMAL;
/**
* @override
* @exportInterface
*/
this.fontStyle = Cue.fontStyle.NORMAL;
/**
* @override
* @exportInterface
*/
this.fontFamily = '';
/**
* @override
* @exportInterface
*/
this.textDecoration = [];
/**
* @override
* @exportInterface
*/
this.wrapLine = true;
/**
* @override
* @exportInterface
*/
this.id = '';
/**
* @override
* @exportInterface
*/
this.nestedCues = [];
/**
* @override
* @exportInterface
*/
this.spacer = false;
};
/**
* Create a copy of the cue with the same properties.
* @return {!shaka.text.Cue}
* @suppress {checkTypes} since we must use [] and "in" with a struct type.
*/
shaka.text.Cue.prototype.clone = function() {
const clone = new shaka.text.Cue(0, 0, '');
for (const k in this) {
clone[k] = this[k];
// Make copies of array fields, but only one level deep. That way, if we
// change, for instance, textDecoration on the clone, we don't affect the
// original.
if (clone[k] && clone[k].constructor == Array) {
clone[k] = /** @type {!Array} */(clone[k]).slice();
}
}
return clone;
};
/**
* Check if two Cues have all the same values in all properties.
* @param {!shaka.text.Cue} cue1
* @param {!shaka.text.Cue} cue2
* @return {boolean}
* @suppress {checkTypes} since we must use [] and "in" with a struct type.
*/
shaka.text.Cue.equal = function(cue1, cue2) {
// Compare the start time, end time and payload of the cues first for
// performance optimization. We can avoid the more expensive recursive
// checks if the top-level properties don't match.
// See: https://github.com/google/shaka-player/issues/3018
if (cue1.startTime != cue2.startTime || cue1.endTime != cue2.endTime ||
cue1.payload != cue2.payload) {
return false;
}
for (const k in cue1) {
if (k == 'startTime' || k == 'endTime' || k == 'payload') {
// Already compared.
} else if (k == 'nestedCues') {
if (!shaka.util.ArrayUtils.equal(
cue1.nestedCues, cue2.nestedCues, shaka.text.Cue.equal)) {
return false;
}
} else if (k == 'region' || k == 'cellResolution') {
for (const k2 in cue1[k]) {
if (cue1[k][k2] != cue2[k][k2]) {
return false;
}
}
} else if (Array.isArray(cue1[k])) {
if (!shaka.util.ArrayUtils.equal(cue1[k], cue2[k])) {
return false;
}
} else {
if (cue1[k] != cue2[k]) {
return false;
}
}
}
return true;
};
/**
* @enum {string}
* @export
*/
shaka.text.Cue.positionAlign = {
'LEFT': 'line-left',
'RIGHT': 'line-right',
'CENTER': 'center',
'AUTO': 'auto',
};
/**
* @enum {string}
* @export
*/
shaka.text.Cue.textAlign = {
'LEFT': 'left',
'RIGHT': 'right',
'CENTER': 'center',
'START': 'start',
'END': 'end',
};
/**
* Vertical alignments of the cues within their extents.
* 'BEFORE' means displaying at the top of the captions container box, 'CENTER'
* means in the middle, 'BOTTOM' means at the bottom.
* @enum {string}
* @export
*/
shaka.text.Cue.displayAlign = {
'BEFORE': 'before',
'CENTER': 'center',
'AFTER': 'after',
};
/**
* @enum {string}
* @export
*/
shaka.text.Cue.direction = {
'HORIZONTAL_LEFT_TO_RIGHT': 'ltr',
'HORIZONTAL_RIGHT_TO_LEFT': 'rtl',
};
/**
* @enum {string}
* @export
*/
shaka.text.Cue.writingMode = {
'HORIZONTAL_TOP_TO_BOTTOM': 'horizontal-tb',
'VERTICAL_LEFT_TO_RIGHT': 'vertical-lr',
'VERTICAL_RIGHT_TO_LEFT': 'vertical-rl',
};
/**
* @enum {number}
* @export
*/
shaka.text.Cue.lineInterpretation = {
'LINE_NUMBER': 0,
'PERCENTAGE': 1,
};
/**
* @enum {string}
* @export
*/
shaka.text.Cue.lineAlign = {
'CENTER': 'center',
'START': 'start',
'END': 'end',
};
/**
* In CSS font weight can be a number, where 400 is normal and 700 is bold.
* Use these values for the enum for consistency.
* @enum {number}
* @export
*/
shaka.text.Cue.fontWeight = {
'NORMAL': 400,
'BOLD': 700,
};
/**
* @enum {string}
* @export
*/
shaka.text.Cue.fontStyle = {
'NORMAL': 'normal',
'ITALIC': 'italic',
'OBLIQUE': 'oblique',
};
/**
* @enum {string}
* @export
*/
shaka.text.Cue.textDecoration = {
'UNDERLINE': 'underline',
'LINE_THROUGH': 'lineThrough',
'OVERLINE': 'overline',
};
/**
* Creates a CueRegion object.
*
* @implements {shaka.extern.CueRegion}
* @constructor
* @struct
* @export
*/
shaka.text.CueRegion = function() {
const CueRegion = shaka.text.CueRegion;
/**
* @override
* @exportInterface
*/
this.id = '';
/**
* @override
* @exportInterface
*/
this.viewportAnchorX = 0;
/**
* @override
* @exportInterface
*/
this.viewportAnchorY = 0;
/**
* @override
* @exportInterface
*/
this.regionAnchorX = 0;
/**
* @override
* @exportInterface
*/
this.regionAnchorY = 0;
/**
* @override
* @exportInterface
*/
this.width = 100;
/**
* @override
* @exportInterface
*/
this.height = 100;
/**
* @override
* @exportInterface
*/
this.heightUnits = CueRegion.units.PERCENTAGE;
/**
* @override
* @exportInterface
*/
this.widthUnits = CueRegion.units.PERCENTAGE;
/**
* @override
* @exportInterface
*/
this.viewportAnchorUnits = CueRegion.units.PERCENTAGE;
/**
* @override
* @exportInterface
*/
this.scroll = CueRegion.scrollMode.NONE;
};
/**
* @enum {number}
* @export
*/
shaka.text.CueRegion.units = {
'PX': 0,
'PERCENTAGE': 1,
'LINES': 2,
};
/**
* @enum {string}
* @export
*/
shaka.text.CueRegion.scrollMode = {
'NONE': '',
'UP': 'up',
};