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 #include "wine/debug.h"
30 WINE_DEFAULT_DEBUG_CHANNEL(mpeg3);
32 BOOL InitMP3(struct mpstr *mp)
36 memset(mp,0,sizeof(struct mpstr));
41 mp->head = mp->tail = NULL;
49 make_decode_tables(32767);
57 void ClearMP3Buffer(struct mpstr *mp)
63 HeapFree(GetProcessHeap(), 0, b->pnt);
65 HeapFree(GetProcessHeap(), 0, b);
73 static struct buf *addbuf(struct mpstr *mp,const unsigned char *buf,int size)
77 nbuf = HeapAlloc(GetProcessHeap(), 0, sizeof(struct buf));
79 WARN("Out of memory!\n");
82 nbuf->pnt = HeapAlloc(GetProcessHeap(), 0, size);
84 HeapFree(GetProcessHeap(), 0, nbuf);
85 WARN("Out of memory!\n");
89 memcpy(nbuf->pnt,buf,size);
91 nbuf->prev = mp->head;
98 mp->head->next = nbuf;
107 static void remove_buf(struct mpstr *mp)
109 struct buf *buf = mp->tail;
111 mp->tail = buf->next;
113 mp->tail->prev = NULL;
115 mp->tail = mp->head = NULL;
118 HeapFree(GetProcessHeap(), 0, buf->pnt);
119 HeapFree(GetProcessHeap(), 0, buf);
123 static int read_buf_byte(struct mpstr *mp)
130 while(pos >= mp->tail->size) {
135 b = mp->tail->pnt[pos];
143 static void read_head(struct mpstr *mp)
147 head = read_buf_byte(mp);
149 head |= read_buf_byte(mp);
151 head |= read_buf_byte(mp);
153 head |= read_buf_byte(mp);
158 int decodeMP3(struct mpstr *mp,const unsigned char *in,int isize,unsigned char *out,
164 ERR("Output buffer too small\n");
169 if(addbuf(mp,in,isize) == NULL) {
174 /* First decode header */
175 if(mp->framesize == 0) {
178 return MP3_NEED_MORE;
181 while (!(ret = decode_header(&mp->fr,mp->header)) && mp->bsize)
183 mp->header = mp->header << 8;
184 mp->header |= read_buf_byte(mp);
188 return MP3_NEED_MORE;
190 mp->framesize = mp->fr.framesize;
193 if(mp->fr.framesize > mp->bsize)
194 return MP3_NEED_MORE;
196 wordpointer = mp->bsspace[mp->bsnum] + 512;
197 mp->bsnum = (mp->bsnum + 1) & 0x1;
201 while(len < mp->framesize) {
203 int blen = mp->tail->size - mp->tail->pos;
204 if( (mp->framesize - len) <= blen) {
205 nlen = mp->framesize-len;
210 memcpy(wordpointer+len,mp->tail->pnt+mp->tail->pos,nlen);
212 mp->tail->pos += nlen;
214 if(mp->tail->pos == mp->tail->size) {
220 if(mp->fr.error_protection)
224 do_layer1(&mp->fr,out,done);
227 do_layer2(&mp->fr,out,done);
230 do_layer3(&mp->fr,out,done);
234 mp->fsizeold = mp->framesize;
240 int set_pointer(struct mpstr *mp, long backstep)
242 unsigned char *bsbufold;
243 if(mp->fsizeold < 0 && backstep > 0) {
244 /* This is not a bug if we just did seeking, the first frame is dropped then */
245 WARN("Can't step back %ld!\n",backstep);
248 bsbufold = mp->bsspace[mp->bsnum] + 512;
249 wordpointer -= backstep;
251 memcpy(wordpointer,bsbufold+mp->fsizeold-backstep,backstep);