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
26 BOOL InitMP3(struct mpstr *mp)
30 memset(mp,0,sizeof(struct mpstr));
35 mp->head = mp->tail = NULL;
43 make_decode_tables(32767);
51 void ClearMP3Buffer(struct mpstr *mp)
67 static struct buf *addbuf(struct mpstr *mp,const unsigned char *buf,int size)
71 nbuf = malloc( sizeof(struct buf) );
73 fprintf(stderr,"Out of memory!\n");
76 nbuf->pnt = malloc(size);
82 memcpy(nbuf->pnt,buf,size);
84 nbuf->prev = mp->head;
91 mp->head->next = nbuf;
100 static void remove_buf(struct mpstr *mp)
102 struct buf *buf = mp->tail;
104 mp->tail = buf->next;
106 mp->tail->prev = NULL;
108 mp->tail = mp->head = NULL;
116 static int read_buf_byte(struct mpstr *mp)
123 while(pos >= mp->tail->size) {
128 b = mp->tail->pnt[pos];
136 static void read_head(struct mpstr *mp)
140 head = read_buf_byte(mp);
142 head |= read_buf_byte(mp);
144 head |= read_buf_byte(mp);
146 head |= read_buf_byte(mp);
151 int decodeMP3(struct mpstr *mp,const unsigned char *in,int isize,unsigned char *out,
157 fprintf(stderr,"To less out space\n");
162 if(addbuf(mp,in,isize) == NULL) {
167 /* First decode header */
168 if(mp->framesize == 0) {
170 return MP3_NEED_MORE;
173 if (decode_header(&mp->fr,mp->header) == 0) {
176 mp->framesize = mp->fr.framesize;
179 if(mp->fr.framesize > mp->bsize)
180 return MP3_NEED_MORE;
182 wordpointer = mp->bsspace[mp->bsnum] + 512;
183 mp->bsnum = (mp->bsnum + 1) & 0x1;
187 while(len < mp->framesize) {
189 int blen = mp->tail->size - mp->tail->pos;
190 if( (mp->framesize - len) <= blen) {
191 nlen = mp->framesize-len;
196 memcpy(wordpointer+len,mp->tail->pnt+mp->tail->pos,nlen);
198 mp->tail->pos += nlen;
200 if(mp->tail->pos == mp->tail->size) {
206 if(mp->fr.error_protection)
210 do_layer1(&mp->fr,out,done);
213 do_layer2(&mp->fr,out,done);
216 do_layer3(&mp->fr,out,done);
220 mp->fsizeold = mp->framesize;
226 int set_pointer(struct mpstr *mp, long backstep)
228 unsigned char *bsbufold;
229 if(mp->fsizeold < 0 && backstep > 0) {
230 fprintf(stderr,"Can't step back %ld!\n",backstep);
233 bsbufold = mp->bsspace[mp->bsnum] + 512;
234 wordpointer -= backstep;
236 memcpy(wordpointer,bsbufold+mp->fsizeold-backstep,backstep);