Borewit
77 lines
2.3 KiB
TypeScript
77 lines
2.3 KiB
TypeScript
import * as Token from 'token-types';
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import type { IGetToken } from 'strtok3';
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import * as util from '../../common/Util.js';
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import { latin1toString } from '@exodus/bytes/single-byte.js';
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/**
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* MusePack stream version 7 format specification
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* http://trac.musepack.net/musepack/wiki/SV7Specification
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*/
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export interface IHeader {
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// word 0
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signature: string;
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streamMinorVersion: number;
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streamMajorVersion: number;
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// word 1
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frameCount: number;
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// word 2
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intensityStereo: boolean;
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midSideStereo: boolean;
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maxBand: number;
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profile: number;
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link: number;
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sampleFrequency: number;
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maxLevel: number;
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// word 3
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titleGain: number;
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titlePeak: number;
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// word 4
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albumGain: number;
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albumPeak: number;
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// word 5
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trueGapless: boolean;
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lastFrameLength: number;
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}
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/**
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* BASIC STRUCTURE
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*/
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export const Header: IGetToken<IHeader> = {
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len: 6 * 4,
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get: (buf, off) => {
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const header = {
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// word 0
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signature: latin1toString(buf.subarray(off, off + 3)),
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// versionIndex number * 1000 (3.81 = 3810) (remember that 4-byte alignment causes this to take 4-bytes)
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streamMinorVersion: util.getBitAllignedNumber(buf, off + 3, 0, 4),
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streamMajorVersion: util.getBitAllignedNumber(buf, off + 3, 4, 4),
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// word 1
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frameCount: Token.UINT32_LE.get(buf, off + 4),
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// word 2
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maxLevel: Token.UINT16_LE.get(buf, off + 8),
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sampleFrequency: [44100, 48000, 37800, 32000][util.getBitAllignedNumber(buf, off + 10, 0, 2)],
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link: util.getBitAllignedNumber(buf, off + 10, 2, 2),
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profile: util.getBitAllignedNumber(buf, off + 10, 4, 4),
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maxBand: util.getBitAllignedNumber(buf, off + 11, 0, 6),
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intensityStereo: util.isBitSet(buf, off + 11, 6),
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midSideStereo: util.isBitSet(buf, off + 11, 7),
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// word 3
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titlePeak: Token.UINT16_LE.get(buf, off + 12),
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titleGain: Token.UINT16_LE.get(buf, off + 14),
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// word 4
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albumPeak: Token.UINT16_LE.get(buf, off + 16),
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albumGain: Token.UINT16_LE.get(buf, off + 18),
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// word
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lastFrameLength: (Token.UINT32_LE.get(buf, off + 20) >>> 20) & 0x7FF,
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trueGapless: util.isBitSet(buf, off + 23, 0)
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};
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header.lastFrameLength = header.trueGapless ? (Token.UINT32_LE.get(buf, 20) >>> 20) & 0x7FF : 0;
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return header;
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}
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};
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