Initial working version

2022-12-22 20:22:22 +11:00
parent ce9675a1cc
commit ced7fa5092
902 changed files with 150252 additions and 0 deletions
@@ -0,0 +1,140 @@
+#!/usr/bin/env node
+
+var fs = require('fs'),
+	audioMetadata = require('../'),
+	util = require('util'),
+	args = process.argv.slice(2),
+	type = 'id3v2',
+	chunkSize = 512,
+	quitAfter = chunkSize,
+	colorize = true,
+	files = [],
+	i;
+
+function usage() {
+	console.log('Extract metadata from audio files');
+	console.log();
+	console.log('USAGE');
+	console.log('audio-metadata --type <type> [options] file1 [file2...]');
+	console.log();
+	console.log('OPTIONS');
+	console.log('--help,-h');
+	console.log('  This help');
+	console.log('--type,-t <type>');
+	console.log('  One of "id3v1", "id3v2" or "ogg"');
+	console.log('--chunk-size,-c <size>');
+	console.log('  Read the file in chunks of <size>; default is 512');
+	console.log('--quit-after,-q <length>');
+	console.log('  Stop searching for metadata if nothing is found after ');
+	console.log('  <length> bytes; default is 512');
+	console.log('--no-colors,-z');
+	console.log('  Don\'t colorize the output');
+	console.log();
+	console.log('EXAMPLE');
+	console.log('Search for metadata in the first 300 bytes in 100 byte increments');
+	console.log(' audio-metadata -t id3v2 -c 100 -q 300 keepitoffmy.wav');
+}
+
+for (i = 0; i < args.length; i++) {
+	switch (args[i]) {
+		case '-t':
+		case '--type':
+			type = args[++i];
+			break;
+		case '-h':
+		case '--help':
+			usage();
+			process.exit(0);
+			break;
+		case '-c':
+		case '--chunk-size':
+			chunkSize = parseInt(args[++i]);
+			break;
+		case '-q':
+		case '--quit-after':
+			quitAfter = parseInt(args[++i]);
+			break;
+		case '-z':
+		case '--no-colors':
+			colorize = false;
+			break;
+		default:
+			files.push(args[i]);
+			break;
+	}
+}
+
+if (!type) {
+	console.error('--type is required');
+	process.exit(1);
+}
+if (!(type in { ogg: 1, id3v1: 1, id3v2: 1 })) {
+	console.error('Unrecognized type: ' + type);
+	process.exit(1);
+}
+
+if (!files.length) {
+	console.error('At least one file must be specified');
+	process.exit(1);
+}
+if (isNaN(chunkSize) || chunkSize < 64) {
+	console.error('Invalid chunk size');
+	process.exit(1);
+}
+if (isNaN(quitAfter)) {
+	console.error('Invalid --quit-after value');
+	process.exit(1);
+}
+if (chunkSize > quitAfter) {
+	console.error('chunk size cannot be greater than quit after value');
+	process.exit(1);
+}
+
+try {
+	for (i = 0; i < files.length; i++) {
+		//everything's done synchronously so things are printed in the expected order
+		var fd = fs.openSync(files[i], 'r'),
+			buffer = new Buffer(quitAfter),
+			metadata = null,
+			offset = 0;
+
+		while (!metadata) {
+			var toRead = offset + chunkSize > quitAfter ? quitAfter - offset : chunkSize;
+			if (!toRead) {
+				break;
+			}
+
+			var bytesRead = fs.readSync(fd, buffer, offset, toRead, offset);
+			if (bytesRead === 0) {
+				//EOF
+				break;
+			}
+
+			offset += bytesRead;
+			metadata = audioMetadata[type](buffer);
+		}
+
+		fs.closeSync(fd);
+
+		if (files.length > 1) {
+			console.log(files[i] + ':');
+		}
+		if (metadata) {
+			if (colorize) {
+				console.log(util.inspect(metadata, false, null, true));
+			} else {
+				console.log(JSON.stringify(metadata, null, '  '));
+			}
+		} else {
+			console.log('no metadata found');
+		}
+
+		console.log();
+	}
+
+	process.exit(0);
+} catch (e) {
+	console.error('An error occurred trying to read from a file');
+	console.error('  ' + e.message);
+	process.exit(1);
+}