001/* JOrbis 002 * Copyright (C) 2000 ymnk, JCraft,Inc. 003 * 004 * Written by: 2000 ymnk<ymnk@jcaft.com> 005 * 006 * Many thanks to 007 * Monty <monty@xiph.org> and 008 * The XIPHOPHORUS Company http://www.xiph.org/ . 009 * JOrbis has been based on their awesome works, Vorbis codec. 010 * 011 * This program is free software; you can redistribute it and/or 012 * modify it under the terms of the GNU Library General Public License 013 * as published by the Free Software Foundation; either version 2 of 014 * the License, or (at your option) any later version. 015 016 * This program is distributed in the hope that it will be useful, 017 * but WITHOUT ANY WARRANTY; without even the implied warranty of 018 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 019 * GNU Library General Public License for more details. 020 * 021 * You should have received a copy of the GNU Library General Public 022 * License along with this program; if not, write to the Free Software 023 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 024 */ 025 026package com.jcraft.jorbis; 027 028import com.jcraft.jogg.*; 029 030// the comments are not part of vorbis_info so that vorbis_info can be 031// static storage 032public class Comment{ 033 private static byte[] _vorbis="vorbis".getBytes(); 034 035 private static final int OV_EFAULT=-129; 036 private static final int OV_EIMPL=-130; 037 038 // unlimited user comment fields. libvorbis writes 'libvorbis' 039 // whatever vendor is set to in encode 040 public byte[][] user_comments; 041 public int[] comment_lengths; 042 public int comments; 043 public byte[] vendor; 044 045 public void init(){ 046 user_comments=null; 047 comments=0; 048 vendor=null; 049 } 050 051 public void add(String comment){ 052 add(comment.getBytes()); 053 } 054 055 private void add(byte[] comment){ 056 byte[][] foo=new byte[comments+2][]; 057 if(user_comments!=null){ 058 System.arraycopy(user_comments, 0, foo, 0, comments); 059 } 060 user_comments=foo; 061 062 int[] goo=new int[comments+2]; 063 if(comment_lengths!=null){ 064 System.arraycopy(comment_lengths, 0, goo, 0, comments); 065 } 066 comment_lengths=goo; 067 068 byte[] bar=new byte[comment.length+1]; 069 System.arraycopy(comment, 0, bar, 0, comment.length); 070 user_comments[comments]=bar; 071 comment_lengths[comments]=comment.length; 072 comments++; 073 user_comments[comments]=null; 074 } 075 076 public void add_tag(String tag, String contents){ 077 if(contents==null) contents=""; 078 add(tag+"="+contents); 079 } 080 081/* 082 private void add_tag(byte[] tag, byte[] contents){ 083 byte[] foo=new byte[tag.length+contents.length+1]; 084 int j=0; 085 for(int i=0; i<tag.length; i++){foo[j++]=tag[i];} 086 foo[j++]=(byte)'='; j++; 087 for(int i=0; i<contents.length; i++){foo[j++]=tag[i];} 088 add(foo); 089 } 090*/ 091 092 // This is more or less the same as strncasecmp - but that doesn't exist 093 // * everywhere, and this is a fairly trivial function, so we include it 094 static boolean tagcompare(byte[] s1, byte[] s2, int n){ 095 int c=0; 096 byte u1, u2; 097 while(c < n){ 098 u1=s1[c]; u2=s2[c]; 099 if(u1>='A')u1=(byte)(u1-'A'+'a'); 100 if(u2>='A')u2=(byte)(u2-'A'+'a'); 101 if(u1!=u2){ return false; } 102 c++; 103 } 104 return true; 105 } 106 107 public String query(String tag){ 108 return query(tag, 0); 109 } 110 111 public String query(String tag, int count){ 112 int foo=query(tag.getBytes(), count); 113 if(foo==-1)return null; 114 byte[] comment=user_comments[foo]; 115 for(int i=0; i<comment_lengths[foo]; i++){ 116 if(comment[i]=='='){ 117 return new String(comment, i+1, comment_lengths[foo]-(i+1)); 118 } 119 } 120 return null; 121 } 122 123 private int query(byte[] tag, int count){ 124 int i=0; 125 int found = 0; 126 int taglen = tag.length; 127 byte[] fulltag = new byte[taglen+2]; 128 System.arraycopy(tag, 0, fulltag, 0, tag.length); 129 fulltag[tag.length]=(byte)'='; 130 131 for(i=0;i<comments;i++){ 132 if(tagcompare(user_comments[i], fulltag, taglen)){ 133 if(count==found){ 134 // We return a pointer to the data, not a copy 135 //return user_comments[i] + taglen + 1; 136 return i; 137 } 138 else{ found++; } 139 } 140 } 141 return -1; 142 } 143 144 int unpack(Buffer opb){ 145 int vendorlen=opb.read(32); 146 if(vendorlen<0){ 147 //goto err_out; 148 clear(); 149 return(-1); 150 } 151 vendor=new byte[vendorlen+1]; 152 opb.read(vendor,vendorlen); 153 comments=opb.read(32); 154 if(comments<0){ 155 //goto err_out; 156 clear(); 157 return(-1); 158 } 159 user_comments=new byte[comments+1][]; 160 comment_lengths=new int[comments+1]; 161 162 for(int i=0;i<comments;i++){ 163 int len=opb.read(32); 164 if(len<0){ 165 //goto err_out; 166 clear(); 167 return(-1); 168 } 169 comment_lengths[i]=len; 170 user_comments[i]=new byte[len+1]; 171 opb.read(user_comments[i], len); 172 } 173 if(opb.read(1)!=1){ 174 //goto err_out; // EOP check 175 clear(); 176 return(-1); 177 178 } 179 return(0); 180// err_out: 181// comment_clear(vc); 182// return(-1); 183 } 184 185 int pack(Buffer opb){ 186 byte[] temp="Xiphophorus libVorbis I 20000508".getBytes(); 187 188 // preamble 189 opb.write(0x03,8); 190 opb.write(_vorbis); 191 192 // vendor 193 opb.write(temp.length,32); 194 opb.write(temp); 195 196 // comments 197 198 opb.write(comments,32); 199 if(comments!=0){ 200 for(int i=0;i<comments;i++){ 201 if(user_comments[i]!=null){ 202 opb.write(comment_lengths[i],32); 203 opb.write(user_comments[i]); 204 } 205 else{ 206 opb.write(0,32); 207 } 208 } 209 } 210 opb.write(1,1); 211 return(0); 212 } 213 214 public int header_out(Packet op){ 215 Buffer opb=new Buffer(); 216 opb.writeinit(); 217 218 if(pack(opb)!=0) return OV_EIMPL; 219 220 op.packet_base = new byte[opb.bytes()]; 221 op.packet=0; 222 op.bytes=opb.bytes(); 223 System.arraycopy(opb.buffer(), 0, op.packet_base, 0, op.bytes); 224 op.b_o_s=0; 225 op.e_o_s=0; 226 op.granulepos=0; 227 return 0; 228 } 229 230 void clear(){ 231 for(int i=0;i<comments;i++) 232 user_comments[i]=null; 233 user_comments=null; 234 vendor=null; 235 } 236 237 public String getVendor(){ 238 return new String(vendor, 0, vendor.length-1); 239 } 240 public String getComment(int i){ 241 if(comments<=i)return null; 242 return new String(user_comments[i], 0, user_comments[i].length-1); 243 } 244 public String toString(){ 245 String foo="Vendor: "+new String(vendor, 0, vendor.length-1); 246 for(int i=0; i<comments; i++){ 247 foo=foo+"\nComment: "+new String(user_comments[i], 0, user_comments[i].length-1); 248 } 249 foo=foo+"\n"; 250 return foo; 251 } 252}