Samuel Kent
86 lines
3.7 KiB
JavaScript
86 lines
3.7 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.AIFFParser = void 0;
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const Token = require("token-types");
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const initDebug = require("debug");
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const strtok3 = require("strtok3/lib/core");
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const ID3v2Parser_1 = require("../id3v2/ID3v2Parser");
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const FourCC_1 = require("../common/FourCC");
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const BasicParser_1 = require("../common/BasicParser");
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const AiffToken = require("./AiffToken");
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const iff = require("../iff");
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const debug = initDebug('music-metadata:parser:aiff');
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/**
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* AIFF - Audio Interchange File Format
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*
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* Ref:
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* http://www.onicos.com/staff/iz/formats/aiff.html
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* http://muratnkonar.com/aiff/index.html
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* http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/AIFF/AIFF.html
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*/
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class AIFFParser extends BasicParser_1.BasicParser {
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async parse() {
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const header = await this.tokenizer.readToken(iff.Header);
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if (header.chunkID !== 'FORM')
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throw new Error('Invalid Chunk-ID, expected \'FORM\''); // Not AIFF format
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const type = await this.tokenizer.readToken(FourCC_1.FourCcToken);
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switch (type) {
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case 'AIFF':
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this.metadata.setFormat('container', type);
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this.isCompressed = false;
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break;
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case 'AIFC':
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this.metadata.setFormat('container', 'AIFF-C');
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this.isCompressed = true;
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break;
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default:
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throw Error('Unsupported AIFF type: ' + type);
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}
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this.metadata.setFormat('lossless', !this.isCompressed);
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try {
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while (!this.tokenizer.fileInfo.size || this.tokenizer.fileInfo.size - this.tokenizer.position >= iff.Header.len) {
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debug('Reading AIFF chunk at offset=' + this.tokenizer.position);
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const chunkHeader = await this.tokenizer.readToken(iff.Header);
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debug(`Chunk id=${chunkHeader.chunkID}`);
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const nextChunk = 2 * Math.round(chunkHeader.chunkSize / 2);
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const bytesRead = await this.readData(chunkHeader);
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await this.tokenizer.ignore(nextChunk - bytesRead);
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}
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}
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catch (err) {
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if (err instanceof strtok3.EndOfStreamError) {
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debug(`End-of-stream`);
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}
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else {
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throw err;
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}
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}
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}
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async readData(header) {
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switch (header.chunkID) {
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case 'COMM': // The Common Chunk
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const common = await this.tokenizer.readToken(new AiffToken.Common(header, this.isCompressed));
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this.metadata.setFormat('bitsPerSample', common.sampleSize);
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this.metadata.setFormat('sampleRate', common.sampleRate);
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this.metadata.setFormat('numberOfChannels', common.numChannels);
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this.metadata.setFormat('numberOfSamples', common.numSampleFrames);
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this.metadata.setFormat('duration', common.numSampleFrames / common.sampleRate);
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this.metadata.setFormat('codec', common.compressionName);
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return header.chunkSize;
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case 'ID3 ': // ID3-meta-data
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const id3_data = await this.tokenizer.readToken(new Token.Uint8ArrayType(header.chunkSize));
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const rst = strtok3.fromBuffer(id3_data);
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await new ID3v2Parser_1.ID3v2Parser().parse(this.metadata, rst, this.options);
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return header.chunkSize;
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case 'SSND': // Sound Data Chunk
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if (this.metadata.format.duration) {
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this.metadata.setFormat('bitrate', 8 * header.chunkSize / this.metadata.format.duration);
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}
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return 0;
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default:
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return 0;
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}
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}
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}
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exports.AIFFParser = AIFFParser;
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