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/**
* AAC demuxer
*/
import BaseAudioDemuxer from './base-audio-demuxer';
import * as ADTS from './adts';
import { logger } from '../utils/logger';
import * as ID3 from '../demux/id3';
import type { HlsEventEmitter } from '../events';
import type { HlsConfig } from '../config';
class AACDemuxer extends BaseAudioDemuxer {
private readonly observer: HlsEventEmitter;
private readonly config: HlsConfig;
constructor(observer, config) {
super();
this.observer = observer;
this.config = config;
}
resetInitSegment(
initSegment: Uint8Array | undefined,
audioCodec: string | undefined,
videoCodec: string | undefined,
trackDuration: number
) {
super.resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration);
this._audioTrack = {
container: 'audio/adts',
type: 'audio',
id: 2,
pid: -1,
sequenceNumber: 0,
segmentCodec: 'aac',
samples: [],
manifestCodec: audioCodec,
duration: trackDuration,
inputTimeScale: 90000,
dropped: 0,
};
}
// Source for probe info - https://wiki.multimedia.cx/index.php?title=ADTS
static probe(data): boolean {
if (!data) {
return false;
}
// Check for the ADTS sync word
// Look for ADTS header | 1111 1111 | 1111 X00X | where X can be either 0 or 1
// Layer bits (position 14 and 15) in header should be always 0 for ADTS
// More info https://wiki.multimedia.cx/index.php?title=ADTS
const id3Data = ID3.getID3Data(data, 0) || [];
let offset = id3Data.length;
for (let length = data.length; offset < length; offset++) {
if (ADTS.probe(data, offset)) {
logger.log('ADTS sync word found !');
return true;
}
}
return false;
}
canParse(data, offset) {
return ADTS.canParse(data, offset);
}
appendFrame(track, data, offset) {
ADTS.initTrackConfig(
track,
this.observer,
data,
offset,
track.manifestCodec
);
const frame = ADTS.appendFrame(
track,
data,
offset,
this.basePTS as number,
this.frameIndex
);
if (frame && frame.missing === 0) {
return frame;
}
}
}
export default AACDemuxer;