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Viewing file:     MpcSv7Parser.js (2.25 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.MpcSv7Parser = void 0;
const debug_1 = require("debug");
const BasicParser_1 = require("../../common/BasicParser");
const APEv2Parser_1 = require("../../apev2/APEv2Parser");
const BitReader_1 = require("./BitReader");
const SV7 = require("./StreamVersion7");
const debug = (0, debug_1.default)('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;