70 lines
2.1 KiB
JavaScript
70 lines
2.1 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.ReplayGain = void 0;
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const common = require("../common/Util");
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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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var NameCode;
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(function (NameCode) {
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/**
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* not set
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*/
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NameCode[NameCode["not_set"] = 0] = "not_set";
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/**
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* Radio Gain Adjustment
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*/
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NameCode[NameCode["radio"] = 1] = "radio";
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/**
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* Audiophile Gain Adjustment
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*/
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NameCode[NameCode["audiophile"] = 2] = "audiophile";
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})(NameCode || (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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var ReplayGainOriginator;
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(function (ReplayGainOriginator) {
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/**
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* Replay Gain unspecified
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*/
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ReplayGainOriginator[ReplayGainOriginator["unspecified"] = 0] = "unspecified";
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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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ReplayGainOriginator[ReplayGainOriginator["engineer"] = 1] = "engineer";
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/**
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* Replay Gain set by user
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*/
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ReplayGainOriginator[ReplayGainOriginator["user"] = 2] = "user";
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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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ReplayGainOriginator[ReplayGainOriginator["automatic"] = 3] = "automatic";
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/**
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* Set by simple RMS average
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*/
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ReplayGainOriginator[ReplayGainOriginator["rms_average"] = 4] = "rms_average";
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})(ReplayGainOriginator || (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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exports.ReplayGain = {
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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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