You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
1.7 KiB
JavaScript
68 lines
1.7 KiB
JavaScript
const Writable = require('stream').Writable;
|
|
|
|
|
|
/**
|
|
* A very simple m3u8 playlist file parser that detects tags and segments.
|
|
*
|
|
* @extends WritableStream
|
|
* @constructor
|
|
*/
|
|
module.exports = class m3u8Parser extends 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] || null;
|
|
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, 10);
|
|
break;
|
|
case 'EXTINF':
|
|
this._nextItemDuration =
|
|
Math.round(parseFloat(value.split(',')[0], 10) * 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();
|
|
}
|
|
};
|