Initial working version

node_modules/music-metadata/lib/musepack/sv7/BitReader.d.ts

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+import { ITokenizer } from 'strtok3/lib/core';
+export declare class BitReader {
+    private tokenizer;
+    pos: number;
+    private dword;
+    constructor(tokenizer: ITokenizer);
+    /**
+     *
+     * @param bits 1..30 bits
+     */
+    read(bits: number): Promise<number>;
+    ignore(bits: number): Promise<number>;
+}

node_modules/music-metadata/lib/musepack/sv7/BitReader.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.BitReader = void 0;
+const Token = require("token-types");
+class BitReader {
+    constructor(tokenizer) {
+        this.tokenizer = tokenizer;
+        this.pos = 0;
+        this.dword = undefined;
+    }
+    /**
+     *
+     * @param bits 1..30 bits
+     */
+    async read(bits) {
+        while (this.dword === undefined) {
+            this.dword = await this.tokenizer.readToken(Token.UINT32_LE);
+        }
+        let out = this.dword;
+        this.pos += bits;
+        if (this.pos < 32) {
+            out >>>= (32 - this.pos);
+            return out & ((1 << bits) - 1);
+        }
+        else {
+            this.pos -= 32;
+            if (this.pos === 0) {
+                this.dword = undefined;
+                return out & ((1 << bits) - 1);
+            }
+            else {
+                this.dword = await this.tokenizer.readToken(Token.UINT32_LE);
+                if (this.pos) {
+                    out <<= this.pos;
+                    out |= this.dword >>> (32 - this.pos);
+                }
+                return out & ((1 << bits) - 1);
+            }
+        }
+    }
+    async ignore(bits) {
+        if (this.pos > 0) {
+            const remaining = 32 - this.pos;
+            this.dword = undefined;
+            bits -= remaining;
+            this.pos = 0;
+        }
+        const remainder = bits % 32;
+        const numOfWords = (bits - remainder) / 32;
+        await this.tokenizer.ignore(numOfWords * 4);
+        return this.read(remainder);
+    }
+}
+exports.BitReader = BitReader;

node_modules/music-metadata/lib/musepack/sv7/MpcSv7Parser.d.ts

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+import { BasicParser } from '../../common/BasicParser';
+export declare class MpcSv7Parser extends BasicParser {
+    private bitreader;
+    private audioLength;
+    private duration;
+    parse(): Promise<void>;
+    private skipAudioData;
+}

node_modules/music-metadata/lib/musepack/sv7/MpcSv7Parser.js

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+'use strict';
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.MpcSv7Parser = void 0;
+const initDebug = require("debug");
+const BasicParser_1 = require("../../common/BasicParser");
+const SV7 = require("./StreamVersion7");
+const APEv2Parser_1 = require("../../apev2/APEv2Parser");
+const BitReader_1 = require("./BitReader");
+const debug = initDebug('music-metadata:parser:musepack');
+class MpcSv7Parser extends BasicParser_1.BasicParser {
+    constructor() {
+        super(...arguments);
+        this.audioLength = 0;
+    }
+    async parse() {
+        const header = await this.tokenizer.readToken(SV7.Header);
+        if (header.signature !== 'MP+')
+            throw new Error('Unexpected magic number');
+        debug(`stream-version=${header.streamMajorVersion}.${header.streamMinorVersion}`);
+        this.metadata.setFormat('container', 'Musepack, SV7');
+        this.metadata.setFormat('sampleRate', header.sampleFrequency);
+        const numberOfSamples = 1152 * (header.frameCount - 1) + header.lastFrameLength;
+        this.metadata.setFormat('numberOfSamples', numberOfSamples);
+        this.duration = numberOfSamples / header.sampleFrequency;
+        this.metadata.setFormat('duration', this.duration);
+        this.bitreader = new BitReader_1.BitReader(this.tokenizer);
+        this.metadata.setFormat('numberOfChannels', header.midSideStereo || header.intensityStereo ? 2 : 1);
+        const version = await this.bitreader.read(8);
+        this.metadata.setFormat('codec', (version / 100).toFixed(2));
+        await this.skipAudioData(header.frameCount);
+        debug(`End of audio stream, switching to APEv2, offset=${this.tokenizer.position}`);
+        return APEv2Parser_1.APEv2Parser.tryParseApeHeader(this.metadata, this.tokenizer, this.options);
+    }
+    async skipAudioData(frameCount) {
+        while (frameCount-- > 0) {
+            const frameLength = await this.bitreader.read(20);
+            this.audioLength += 20 + frameLength;
+            await this.bitreader.ignore(frameLength);
+        }
+        // last frame
+        const lastFrameLength = await this.bitreader.read(11);
+        this.audioLength += lastFrameLength;
+        this.metadata.setFormat('bitrate', this.audioLength / this.duration);
+    }
+}
+exports.MpcSv7Parser = MpcSv7Parser;

node_modules/music-metadata/lib/musepack/sv7/StreamVersion7.d.ts

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+import { IGetToken } from 'strtok3/lib/core';
+/**
+ * MusePack stream version 7 format specification
+ * http://trac.musepack.net/musepack/wiki/SV7Specification
+ */
+export interface IHeader {
+    signature: string;
+    streamMinorVersion: number;
+    streamMajorVersion: number;
+    frameCount: number;
+    intensityStereo: boolean;
+    midSideStereo: boolean;
+    maxBand: number;
+    profile: number;
+    link: number;
+    sampleFrequency: number;
+    maxLevel: number;
+    titleGain: number;
+    titlePeak: number;
+    albumGain: number;
+    albumPeak: number;
+    trueGapless: boolean;
+    lastFrameLength: number;
+}
+/**
+ * BASIC STRUCTURE
+ */
+export declare const Header: IGetToken<IHeader>;

node_modules/music-metadata/lib/musepack/sv7/StreamVersion7.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Header = void 0;
+const Token = require("token-types");
+const util = require("../../common/Util");
+/**
+ * BASIC STRUCTURE
+ */
+exports.Header = {
+    len: 6 * 4,
+    get: (buf, off) => {
+        const header = {
+            // word 0
+            signature: Buffer.from(buf).toString('latin1', off, off + 3),
+            // versionIndex number * 1000 (3.81 = 3810) (remember that 4-byte alignment causes this to take 4-bytes)
+            streamMinorVersion: util.getBitAllignedNumber(buf, off + 3, 0, 4),
+            streamMajorVersion: util.getBitAllignedNumber(buf, off + 3, 4, 4),
+            // word 1
+            frameCount: Token.UINT32_LE.get(buf, off + 4),
+            // word 2
+            maxLevel: Token.UINT16_LE.get(buf, off + 8),
+            sampleFrequency: [44100, 48000, 37800, 32000][util.getBitAllignedNumber(buf, off + 10, 0, 2)],
+            link: util.getBitAllignedNumber(buf, off + 10, 2, 2),
+            profile: util.getBitAllignedNumber(buf, off + 10, 4, 4),
+            maxBand: util.getBitAllignedNumber(buf, off + 11, 0, 6),
+            intensityStereo: util.isBitSet(buf, off + 11, 6),
+            midSideStereo: util.isBitSet(buf, off + 11, 7),
+            // word 3
+            titlePeak: Token.UINT16_LE.get(buf, off + 12),
+            titleGain: Token.UINT16_LE.get(buf, off + 14),
+            // word 4
+            albumPeak: Token.UINT16_LE.get(buf, off + 16),
+            albumGain: Token.UINT16_LE.get(buf, off + 18),
+            // word
+            lastFrameLength: (Token.UINT32_LE.get(buf, off + 20) >>> 20) & 0x7FF,
+            trueGapless: util.isBitSet(buf, off + 23, 0)
+        };
+        header.lastFrameLength = header.trueGapless ? (Token.UINT32_LE.get(buf, 20) >>> 20) & 0x7FF : 0;
+        return header;
+    }
+};