32 lines
1.2 KiB
JavaScript
32 lines
1.2 KiB
JavaScript
"use strict";
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/**
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* Extended Lame Header
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.ExtendedLameHeader = void 0;
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const Token = require("token-types");
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const common = require("../common/Util");
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const ReplayGainDataFormat_1 = require("./ReplayGainDataFormat");
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/**
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* Info Tag
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* @link http://gabriel.mp3-tech.org/mp3infotag.html
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* @link https://github.com/quodlibet/mutagen/blob/abd58ee58772224334a18817c3fb31103572f70e/mutagen/mp3/_util.py#L112
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*/
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exports.ExtendedLameHeader = {
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len: 27,
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get: (buf, off) => {
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const track_peak = Token.UINT32_BE.get(buf, off + 2);
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return {
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revision: common.getBitAllignedNumber(buf, off, 0, 4),
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vbr_method: common.getBitAllignedNumber(buf, off, 4, 4),
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lowpass_filter: 100 * Token.UINT8.get(buf, off + 1),
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track_peak: track_peak === 0 ? undefined : track_peak / Math.pow(2, 23),
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track_gain: ReplayGainDataFormat_1.ReplayGain.get(buf, 6),
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album_gain: ReplayGainDataFormat_1.ReplayGain.get(buf, 8),
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music_length: Token.UINT32_BE.get(buf, off + 20),
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music_crc: Token.UINT8.get(buf, off + 24),
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header_crc: Token.UINT16_BE.get(buf, off + 24)
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};
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}
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};
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