56 lines
2.5 KiB
JavaScript
56 lines
2.5 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.MpcSv8Parser = void 0;
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const debug_1 = require("debug");
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const BasicParser_1 = require("../../common/BasicParser");
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const APEv2Parser_1 = require("../../apev2/APEv2Parser");
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const FourCC_1 = require("../../common/FourCC");
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const SV8 = require("./StreamVersion8");
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const debug = (0, debug_1.default)('music-metadata:parser:musepack');
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class MpcSv8Parser extends BasicParser_1.BasicParser {
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constructor() {
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super(...arguments);
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this.audioLength = 0;
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}
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async parse() {
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const signature = await this.tokenizer.readToken(FourCC_1.FourCcToken);
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if (signature !== 'MPCK')
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throw new Error('Invalid Magic number');
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this.metadata.setFormat('container', 'Musepack, SV8');
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return this.parsePacket();
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}
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async parsePacket() {
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const sv8reader = new SV8.StreamReader(this.tokenizer);
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do {
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const header = await sv8reader.readPacketHeader();
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debug(`packet-header key=${header.key}, payloadLength=${header.payloadLength}`);
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switch (header.key) {
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case 'SH': // Stream Header
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const sh = await sv8reader.readStreamHeader(header.payloadLength);
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this.metadata.setFormat('numberOfSamples', sh.sampleCount);
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this.metadata.setFormat('sampleRate', sh.sampleFrequency);
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this.metadata.setFormat('duration', sh.sampleCount / sh.sampleFrequency);
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this.metadata.setFormat('numberOfChannels', sh.channelCount);
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break;
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case 'AP': // Audio Packet
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this.audioLength += header.payloadLength;
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await this.tokenizer.ignore(header.payloadLength);
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break;
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case 'RG': // Replaygain
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case 'EI': // Encoder Info
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case 'SO': // Seek Table Offset
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case 'ST': // Seek Table
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case 'CT': // Chapter-Tag
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await this.tokenizer.ignore(header.payloadLength);
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break;
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case 'SE': // Stream End
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this.metadata.setFormat('bitrate', this.audioLength * 8 / this.metadata.format.duration);
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return APEv2Parser_1.APEv2Parser.tryParseApeHeader(this.metadata, this.tokenizer, this.options);
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default:
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throw new Error(`Unexpected header: ${header.key}`);
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}
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} while (true);
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}
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}
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exports.MpcSv8Parser = MpcSv8Parser;
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