Samuel Kent
140 lines
3.2 KiB
JavaScript
140 lines
3.2 KiB
JavaScript
#!/usr/bin/env node
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var fs = require('fs'),
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audioMetadata = require('../'),
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util = require('util'),
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args = process.argv.slice(2),
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type = 'id3v2',
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chunkSize = 512,
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quitAfter = chunkSize,
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colorize = true,
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files = [],
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i;
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function usage() {
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console.log('Extract metadata from audio files');
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console.log();
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console.log('USAGE');
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console.log('audio-metadata --type <type> [options] file1 [file2...]');
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console.log();
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console.log('OPTIONS');
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console.log('--help,-h');
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console.log(' This help');
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console.log('--type,-t <type>');
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console.log(' One of "id3v1", "id3v2" or "ogg"');
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console.log('--chunk-size,-c <size>');
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console.log(' Read the file in chunks of <size>; default is 512');
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console.log('--quit-after,-q <length>');
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console.log(' Stop searching for metadata if nothing is found after ');
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console.log(' <length> bytes; default is 512');
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console.log('--no-colors,-z');
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console.log(' Don\'t colorize the output');
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console.log();
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console.log('EXAMPLE');
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console.log('Search for metadata in the first 300 bytes in 100 byte increments');
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console.log(' audio-metadata -t id3v2 -c 100 -q 300 keepitoffmy.wav');
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}
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for (i = 0; i < args.length; i++) {
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switch (args[i]) {
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case '-t':
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case '--type':
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type = args[++i];
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break;
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case '-h':
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case '--help':
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usage();
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process.exit(0);
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break;
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case '-c':
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case '--chunk-size':
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chunkSize = parseInt(args[++i]);
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break;
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case '-q':
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case '--quit-after':
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quitAfter = parseInt(args[++i]);
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break;
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case '-z':
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case '--no-colors':
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colorize = false;
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break;
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default:
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files.push(args[i]);
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break;
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}
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}
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if (!type) {
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console.error('--type is required');
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process.exit(1);
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}
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if (!(type in { ogg: 1, id3v1: 1, id3v2: 1 })) {
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console.error('Unrecognized type: ' + type);
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process.exit(1);
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}
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if (!files.length) {
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console.error('At least one file must be specified');
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process.exit(1);
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}
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if (isNaN(chunkSize) || chunkSize < 64) {
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console.error('Invalid chunk size');
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process.exit(1);
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}
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if (isNaN(quitAfter)) {
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console.error('Invalid --quit-after value');
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process.exit(1);
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}
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if (chunkSize > quitAfter) {
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console.error('chunk size cannot be greater than quit after value');
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process.exit(1);
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}
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try {
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for (i = 0; i < files.length; i++) {
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//everything's done synchronously so things are printed in the expected order
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var fd = fs.openSync(files[i], 'r'),
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buffer = new Buffer(quitAfter),
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metadata = null,
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offset = 0;
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while (!metadata) {
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var toRead = offset + chunkSize > quitAfter ? quitAfter - offset : chunkSize;
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if (!toRead) {
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break;
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}
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var bytesRead = fs.readSync(fd, buffer, offset, toRead, offset);
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if (bytesRead === 0) {
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//EOF
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break;
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}
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offset += bytesRead;
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metadata = audioMetadata[type](buffer);
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}
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fs.closeSync(fd);
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if (files.length > 1) {
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console.log(files[i] + ':');
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}
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if (metadata) {
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if (colorize) {
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console.log(util.inspect(metadata, false, null, true));
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} else {
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console.log(JSON.stringify(metadata, null, ' '));
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}
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} else {
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console.log('no metadata found');
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}
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console.log();
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}
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process.exit(0);
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} catch (e) {
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console.error('An error occurred trying to read from a file');
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console.error(' ' + e.message);
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process.exit(1);
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} |