Justinas Delinda
78 lines
1.7 KiB
TypeScript
78 lines
1.7 KiB
TypeScript
import type { IGetToken } from 'strtok3';
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import * as common from '../common/Util.js';
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export interface IReplayGain {
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type: NameCode;
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origin: ReplayGainOriginator;
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adjustment: number;
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}
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/**
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* https://github.com/Borewit/music-metadata/wiki/Replay-Gain-Data-Format#name-code
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*/
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const NameCode = {
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/**
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* not set
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*/
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not_set: 0,
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/**
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* Radio Gain Adjustment
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*/
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radio: 1,
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/**
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* Audiophile Gain Adjustment
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*/
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audiophile: 2
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};
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type NameCode = typeof NameCode[keyof typeof NameCode];
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/**
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* https://github.com/Borewit/music-metadata/wiki/Replay-Gain-Data-Format#originator-code
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*/
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const ReplayGainOriginator ={
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/**
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* Replay Gain unspecified
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*/
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unspecified: 0,
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/**
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* Replay Gain pre-set by artist/producer/mastering engineer
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*/
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engineer: 1,
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/**
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* Replay Gain set by user
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*/
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user: 2,
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/**
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* Replay Gain determined automatically, as described on this site
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*/
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automatic: 3,
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/**
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* Set by simple RMS average
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*/
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rms_average: 4
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}
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type ReplayGainOriginator = typeof ReplayGainOriginator[keyof typeof ReplayGainOriginator];
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/**
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* Replay Gain Data Format
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*
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* https://github.com/Borewit/music-metadata/wiki/Replay-Gain-Data-Format
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*/
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export const ReplayGain: IGetToken<IReplayGain | undefined> = {
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len: 2,
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get: (buf, off) => {
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const gain_type = common.getBitAllignedNumber(buf, off, 0, 3);
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const sign = common.getBitAllignedNumber(buf, off, 6, 1);
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const gain_adj = common.getBitAllignedNumber(buf, off, 7, 9) / 10.0;
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if (gain_type > 0) {
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return {
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type: common.getBitAllignedNumber(buf, off, 0, 3),
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origin: common.getBitAllignedNumber(buf, off, 3, 3),
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adjustment: (sign ? -gain_adj : gain_adj)
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};
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}
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return undefined;
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}
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};
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