253 lines
6.2 KiB
Java
253 lines
6.2 KiB
Java
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/* JOrbis
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* Copyright (C) 2000 ymnk, JCraft,Inc.
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*
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* Written by: 2000 ymnk<ymnk@jcraft.com>
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*
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* Many thanks to
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* Monty <monty@xiph.org> and
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* The XIPHOPHORUS Company http://www.xiph.org/ .
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* JOrbis has been based on their awesome works, Vorbis codec.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License
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* as published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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package com.jcraft.jorbis;
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import com.jcraft.jogg.*;
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// the comments are not part of vorbis_info so that vorbis_info can be
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// static storage
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public class Comment{
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private static byte[] _vorbis="vorbis".getBytes();
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private static final int OV_EFAULT=-129;
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private static final int OV_EIMPL=-130;
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// unlimited user comment fields. libvorbis writes 'libvorbis'
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// whatever vendor is set to in encode
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public byte[][] user_comments;
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public int[] comment_lengths;
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public int comments;
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public byte[] vendor;
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public void init(){
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user_comments=null;
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comments=0;
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vendor=null;
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}
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public void add(String comment){
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add(comment.getBytes());
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}
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private void add(byte[] comment){
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byte[][] foo=new byte[comments+2][];
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if(user_comments!=null){
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System.arraycopy(user_comments, 0, foo, 0, comments);
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}
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user_comments=foo;
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int[] goo=new int[comments+2];
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if(comment_lengths!=null){
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System.arraycopy(comment_lengths, 0, goo, 0, comments);
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}
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comment_lengths=goo;
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byte[] bar=new byte[comment.length+1];
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System.arraycopy(comment, 0, bar, 0, comment.length);
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user_comments[comments]=bar;
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comment_lengths[comments]=comment.length;
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comments++;
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user_comments[comments]=null;
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}
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public void add_tag(String tag, String contents){
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if(contents==null) contents="";
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add(tag+"="+contents);
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}
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/*
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private void add_tag(byte[] tag, byte[] contents){
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byte[] foo=new byte[tag.length+contents.length+1];
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int j=0;
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for(int i=0; i<tag.length; i++){foo[j++]=tag[i];}
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foo[j++]=(byte)'='; j++;
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for(int i=0; i<contents.length; i++){foo[j++]=tag[i];}
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add(foo);
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}
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*/
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// This is more or less the same as strncasecmp - but that doesn't exist
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// * everywhere, and this is a fairly trivial function, so we include it
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static boolean tagcompare(byte[] s1, byte[] s2, int n){
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int c=0;
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byte u1, u2;
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while(c < n){
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u1=s1[c]; u2=s2[c];
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if('Z'>=u1 && u1>='A')u1=(byte)(u1-'A'+'a');
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if('Z'>=u2 && u2>='A')u2=(byte)(u2-'A'+'a');
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if(u1!=u2){ return false; }
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c++;
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}
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return true;
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}
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public String query(String tag){
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return query(tag, 0);
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}
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public String query(String tag, int count){
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int foo=query(tag.getBytes(), count);
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if(foo==-1)return null;
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byte[] comment=user_comments[foo];
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for(int i=0; i<comment_lengths[foo]; i++){
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if(comment[i]=='='){
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return new String(comment, i+1, comment_lengths[foo]-(i+1));
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}
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}
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return null;
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}
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private int query(byte[] tag, int count){
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int i=0;
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int found = 0;
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int fulltaglen = tag.length + 1;
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byte[] fulltag = new byte[fulltaglen];
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System.arraycopy(tag, 0, fulltag, 0, tag.length);
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fulltag[tag.length]=(byte)'=';
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for(i=0;i<comments;i++){
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if(tagcompare(user_comments[i], fulltag, fulltaglen)){
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if(count==found){
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// We return a pointer to the data, not a copy
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//return user_comments[i] + taglen + 1;
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return i;
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}
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else{ found++; }
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}
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}
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return -1;
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}
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int unpack(Buffer opb){
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int vendorlen=opb.read(32);
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if(vendorlen<0){
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//goto err_out;
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clear();
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return(-1);
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}
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vendor=new byte[vendorlen+1];
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opb.read(vendor,vendorlen);
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comments=opb.read(32);
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if(comments<0){
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//goto err_out;
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clear();
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return(-1);
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}
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user_comments=new byte[comments+1][];
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comment_lengths=new int[comments+1];
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for(int i=0;i<comments;i++){
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int len=opb.read(32);
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if(len<0){
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//goto err_out;
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clear();
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return(-1);
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}
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comment_lengths[i]=len;
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user_comments[i]=new byte[len+1];
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opb.read(user_comments[i], len);
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}
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if(opb.read(1)!=1){
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//goto err_out; // EOP check
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clear();
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return(-1);
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}
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return(0);
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// err_out:
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// comment_clear(vc);
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// return(-1);
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}
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int pack(Buffer opb){
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byte[] temp="Xiphophorus libVorbis I 20000508".getBytes();
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// preamble
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opb.write(0x03,8);
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opb.write(_vorbis);
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// vendor
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opb.write(temp.length,32);
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opb.write(temp);
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// comments
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opb.write(comments,32);
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if(comments!=0){
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for(int i=0;i<comments;i++){
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if(user_comments[i]!=null){
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opb.write(comment_lengths[i],32);
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opb.write(user_comments[i]);
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}
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else{
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opb.write(0,32);
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}
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}
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}
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opb.write(1,1);
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return(0);
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}
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public int header_out(Packet op){
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Buffer opb=new Buffer();
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opb.writeinit();
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if(pack(opb)!=0) return OV_EIMPL;
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op.packet_base = new byte[opb.bytes()];
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op.packet=0;
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op.bytes=opb.bytes();
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System.arraycopy(opb.buffer(), 0, op.packet_base, 0, op.bytes);
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op.b_o_s=0;
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op.e_o_s=0;
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op.granulepos=0;
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return 0;
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}
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void clear(){
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for(int i=0;i<comments;i++)
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user_comments[i]=null;
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user_comments=null;
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vendor=null;
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}
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public String getVendor(){
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return new String(vendor, 0, vendor.length-1);
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}
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public String getComment(int i){
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if(comments<=i)return null;
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return new String(user_comments[i], 0, user_comments[i].length-1);
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}
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public String toString(){
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String foo="Vendor: "+new String(vendor, 0, vendor.length-1);
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for(int i=0; i<comments; i++){
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foo=foo+"\nComment: "+new String(user_comments[i], 0, user_comments[i].length-1);
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}
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foo=foo+"\n";
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return foo;
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}
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}
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