@svta/common-media-library
Version:
A common library for media playback in JavaScript
76 lines • 2.53 kB
JavaScript
const TOKENS = /\$(RepresentationID|Number|SubNumber|Bandwidth|Time)?(?:%0([0-9]+)([diouxX]))?\$/g;
/**
* Process a URI template used in `SegmentTemplate` nodes.
*
* @param uriTemplate - URI template to process.
* @param representationId - Representation ID.
* @param number - Number.
* @param subNumber - Sub-number.
* @param bandwidth - Bandwidth.
* @param time - Time. Should be passed as a number unless the value is larger than `MAX_SAFE_INTEGER`, then it should be provided as a string. If the value is a string all format tags will be ignored.
*
* @returns Processed URI template.
*
* @group DASH
* @beta
*
* @example
* {@includeCode ../../test/dash/processUriTemplate.test.ts#example}
*/
export function processUriTemplate(uriTemplate, representationId, number, subNumber, bandwidth, time) {
const uri = uriTemplate.replace(TOKENS, (match, name, widthStr, format) => {
let value;
switch (name) {
case undefined: // $$ case
return '$';
case 'RepresentationID':
value = representationId;
break;
case 'Number':
value = number;
break;
case 'SubNumber':
value = subNumber;
break;
case 'Bandwidth':
value = bandwidth;
break;
case 'Time':
if (typeof time === 'string') {
return time;
}
value = time ? Math.round(time) : time;
break;
default:
value = null;
}
if (value == null) {
return match;
}
let valueString;
switch (format) {
case undefined: // Happens if there is no format specifier.
case 'd':
case 'i':
case 'u':
valueString = value.toString();
break;
case 'o':
valueString = value.toString(8);
break;
case 'x':
valueString = value.toString(16);
break;
case 'X':
valueString = value.toString(16).toUpperCase();
break;
default:
valueString = value.toString();
break;
}
const width = parseInt(widthStr, 10) || 1;
return valueString.padStart(width, '0');
});
return uri;
}
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