2 * Copyright (c) Michael Hipp and other authors of the mpglib project.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
25 /* Global mp .. it's a hack */
29 BOOL InitMP3(struct mpstr *mp)
33 memset(mp,0,sizeof(struct mpstr));
38 mp->head = mp->tail = NULL;
45 make_decode_tables(32767);
53 void ExitMP3(struct mpstr *mp)
66 static struct buf *addbuf(struct mpstr *mp,const unsigned char *buf,int size)
70 nbuf = malloc( sizeof(struct buf) );
72 fprintf(stderr,"Out of memory!\n");
75 nbuf->pnt = malloc(size);
81 memcpy(nbuf->pnt,buf,size);
83 nbuf->prev = mp->head;
90 mp->head->next = nbuf;
99 static void remove_buf(struct mpstr *mp)
101 struct buf *buf = mp->tail;
103 mp->tail = buf->next;
105 mp->tail->prev = NULL;
107 mp->tail = mp->head = NULL;
115 static int read_buf_byte(struct mpstr *mp)
122 while(pos >= mp->tail->size) {
127 b = mp->tail->pnt[pos];
135 static void read_head(struct mpstr *mp)
139 head = read_buf_byte(mp);
141 head |= read_buf_byte(mp);
143 head |= read_buf_byte(mp);
145 head |= read_buf_byte(mp);
150 int decodeMP3(struct mpstr *mp,const unsigned char *in,int isize,unsigned char *out,
158 fprintf(stderr,"To less out space\n");
163 if(addbuf(mp,in,isize) == NULL) {
168 /* First decode header */
169 if(mp->framesize == 0) {
171 return MP3_NEED_MORE;
174 if (decode_header(&mp->fr,mp->header) == 0) {
177 mp->framesize = mp->fr.framesize;
180 if(mp->fr.framesize > mp->bsize)
181 return MP3_NEED_MORE;
183 wordpointer = mp->bsspace[mp->bsnum] + 512;
184 mp->bsnum = (mp->bsnum + 1) & 0x1;
188 while(len < mp->framesize) {
190 int blen = mp->tail->size - mp->tail->pos;
191 if( (mp->framesize - len) <= blen) {
192 nlen = mp->framesize-len;
197 memcpy(wordpointer+len,mp->tail->pnt+mp->tail->pos,nlen);
199 mp->tail->pos += nlen;
201 if(mp->tail->pos == mp->tail->size) {
207 if(mp->fr.error_protection)
211 do_layer1(&mp->fr,(unsigned char *) out,done);
214 do_layer2(&mp->fr,(unsigned char *) out,done);
217 do_layer3(&mp->fr,(unsigned char *) out,done);
221 mp->fsizeold = mp->framesize;
227 int set_pointer(long backstep)
229 unsigned char *bsbufold;
230 if(gmp->fsizeold < 0 && backstep > 0) {
231 fprintf(stderr,"Can't step back %ld!\n",backstep);
234 bsbufold = gmp->bsspace[gmp->bsnum] + 512;
235 wordpointer -= backstep;
237 memcpy(wordpointer,bsbufold+gmp->fsizeold-backstep,backstep);