109 lines
2.7 KiB
JavaScript
109 lines
2.7 KiB
JavaScript
var util = require("util");
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var MetaDataBlock = require("./MetaDataBlock");
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var MetaDataBlockVorbisComment = module.exports = function(isLast) {
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MetaDataBlock.call(this, isLast, 4);
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this.vendor = "";
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this.comments = [];
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}
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util.inherits(MetaDataBlockVorbisComment, MetaDataBlock);
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MetaDataBlockVorbisComment.create = function(isLast, vendor, comments) {
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var mdb = new MetaDataBlockVorbisComment(isLast);
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mdb.vendor = vendor;
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mdb.comments = comments;
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mdb.hasData = true;
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return mdb;
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}
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MetaDataBlockVorbisComment.prototype.parse = function(buffer) {
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try {
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var pos = 0;
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var vendorLen = buffer.readUInt32LE(pos);
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var vendor = buffer.toString("utf8", pos + 4, pos + 4 + vendorLen);
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this.vendor = vendor;
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pos += 4 + vendorLen;
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var commentCount = buffer.readUInt32LE(pos);
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pos += 4;
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while (commentCount-- > 0) {
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var commentLen = buffer.readUInt32LE(pos);
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var comment = buffer.toString("utf8", pos + 4, pos + 4 + commentLen);
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this.comments.push(comment);
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pos += 4 + commentLen;
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}
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this.hasData = true;
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}
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catch (e) {
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this.error = e;
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this.hasData = false;
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}
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}
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MetaDataBlockVorbisComment.prototype.publish = function() {
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var pos = 0;
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var size = this.getSize();
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var buffer = new Buffer(4 + size);
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var header = size;
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header |= (this.type << 24);
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header |= (this.isLast ? 0x80000000 : 0);
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buffer.writeUInt32BE(header >>> 0, pos);
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pos += 4;
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var vendorLen = Buffer.byteLength(this.vendor);
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buffer.writeUInt32LE(vendorLen, pos);
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buffer.write(this.vendor, pos + 4);
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pos += 4 + vendorLen;
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var commentCount = this.comments.length;
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buffer.writeUInt32LE(commentCount, pos);
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pos += 4;
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for (var i = 0; i < commentCount; i++) {
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var comment = this.comments[i];
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var commentLen = Buffer.byteLength(comment);
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buffer.writeUInt32LE(commentLen, pos);
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buffer.write(comment, pos + 4);
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pos += 4 + commentLen;
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}
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return buffer;
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}
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MetaDataBlockVorbisComment.prototype.getSize = function() {
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var size = 8 + Buffer.byteLength(this.vendor);
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for (var i = 0; i < this.comments.length; i++) {
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size += 4 + Buffer.byteLength(this.comments[i]);
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}
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return size;
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}
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MetaDataBlockVorbisComment.prototype.toString = function() {
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var str = "[MetaDataBlockVorbisComment]";
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str += " type: " + this.type;
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str += ", isLast: " + this.isLast;
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if (this.error) {
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str += "\n ERROR: " + this.error;
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}
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if (this.hasData) {
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str += "\n vendor: " + this.vendor;
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if (this.comments.length) {
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str += "\n comments:";
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for (var i = 0; i < this.comments.length; i++) {
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str += "\n " + this.comments[i].split("=").join(": ");
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}
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} else {
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str += "\n comments: none";
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}
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}
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return str;
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}
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