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musix-oss/node_modules/m3u8stream/dist/m3u8-parser.js

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2020-03-03 20:30:50 +00:00
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const stream_1 = require("stream");
/**
* A very simple m3u8 playlist file parser that detects tags and segments.
*/
class m3u8Parser extends stream_1.Writable {
constructor() {
super();
this._lastLine = '';
this._seq = 0;
this._nextItemDuration = null;
this.on('finish', () => {
this._parseLine(this._lastLine);
this.emit('end');
});
}
_parseLine(line) {
let match = line.match(/^#(EXT[A-Z0-9-]+)(?::(.*))?/);
if (match) {
// This is a tag.
const tag = match[1];
const value = match[2] || '';
switch (tag) {
case 'EXT-X-PROGRAM-DATE-TIME':
this.emit('starttime', new Date(value).getTime());
break;
case 'EXT-X-MEDIA-SEQUENCE':
this._seq = parseInt(value);
break;
case 'EXTINF':
this._nextItemDuration =
Math.round(parseFloat(value.split(',')[0]) * 1000);
break;
case 'EXT-X-ENDLIST':
this.emit('endlist');
break;
}
}
else if (!/^#/.test(line) && line.trim()) {
// This is a segment
this.emit('item', {
url: line.trim(),
seq: this._seq++,
duration: this._nextItemDuration,
});
}
}
_write(chunk, encoding, callback) {
let lines = chunk.toString('utf8').split('\n');
if (this._lastLine) {
lines[0] = this._lastLine + lines[0];
}
lines.forEach((line, i) => {
if (i < lines.length - 1) {
this._parseLine(line);
}
else {
// Save the last line in case it has been broken up.
this._lastLine = line;
}
});
callback();
}
}
exports.default = m3u8Parser;
//# sourceMappingURL=m3u8-parser.js.map