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/**
* MP3 demuxer
*/
import BaseAudioDemuxer from './base-audio-demuxer';
import * as ID3 from '../demux/id3';
import { logger } from '../utils/logger';
import * as MpegAudio from './mpegaudio';
class MP3Demuxer extends BaseAudioDemuxer {
resetInitSegment(
initSegment: Uint8Array | undefined,
audioCodec: string | undefined,
videoCodec: string | undefined,
trackDuration: number
) {
super.resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration);
this._audioTrack = {
container: 'audio/mpeg',
type: 'audio',
id: 2,
pid: -1,
sequenceNumber: 0,
segmentCodec: 'mp3',
samples: [],
manifestCodec: audioCodec,
duration: trackDuration,
inputTimeScale: 90000,
dropped: 0,
};
}
static probe(data): boolean {
if (!data) {
return false;
}
// check if data contains ID3 timestamp and MPEG sync word
// Look for MPEG header | 1111 1111 | 111X XYZX | where X can be either 0 or 1 and Y or Z should be 1
// Layer bits (position 14 and 15) in header should be always different from 0 (Layer I or Layer II or Layer III)
// More info http://www.mp3-tech.org/programmer/frame_header.html
const id3Data = ID3.getID3Data(data, 0) || [];
let offset = id3Data.length;
for (let length = data.length; offset < length; offset++) {
if (MpegAudio.probe(data, offset)) {
logger.log('MPEG Audio sync word found !');
return true;
}
}
return false;
}
canParse(data, offset) {
return MpegAudio.canParse(data, offset);
}
appendFrame(track, data, offset) {
if (this.basePTS === null) {
return;
}
return MpegAudio.appendFrame(
track,
data,
offset,
this.basePTS,
this.frameIndex
);
}
}
export default MP3Demuxer;