dlls/winemp3.acm/interface.c

   1 /*
   2  * Copyright (c) Michael Hipp and other authors of the mpglib project.
   3  *
   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.
   8  *
   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.
  13  *
  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
  17  */
  18
  19 #include "config.h"
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22
  23 #include "wine/debug.h"
  24 #include "mpg123.h"
  25 #include "mpglib.h"
  26
  27 WINE_DEFAULT_DEBUG_CHANNEL(mpeg3);
  28
  29 BOOL InitMP3(struct mpstr *mp)
  30 {
  31         static int init = 0;
  32
  33         memset(mp,0,sizeof(struct mpstr));
  34
  35         mp->framesize = 0;
  36         mp->fsizeold = -1;
  37         mp->bsize = 0;
  38         mp->head = mp->tail = NULL;
  39         mp->fr.single = -1;
  40         mp->bsnum = 0;
  41         mp->synth_bo = 1;
  42         mp->fr.mp = mp;
  43
  44         if(!init) {
  45                 init = 1;
  46                 make_decode_tables(32767);
  47                 init_layer2();
  48                 init_layer3(SBLIMIT);
  49         }
  50
  51         return !0;
  52 }
  53
  54 void ClearMP3Buffer(struct mpstr *mp)
  55 {
  56         struct buf *b,*bn;
  57
  58         b = mp->tail;
  59         while(b) {
  60                 free(b->pnt);
  61                 bn = b->next;
  62                 free(b);
  63                 b = bn;
  64         }
  65         mp->tail = NULL;
  66         mp->head = NULL;
  67         mp->bsize = 0;
  68 }
  69
  70 static struct buf *addbuf(struct mpstr *mp,const unsigned char *buf,int size)
  71 {
  72         struct buf *nbuf;
  73
  74         nbuf = malloc( sizeof(struct buf) );
  75         if(!nbuf) {
  76                 WARN("Out of memory!\n");
  77                 return NULL;
  78         }
  79         nbuf->pnt = malloc(size);
  80         if(!nbuf->pnt) {
  81                 free(nbuf);
  82                 WARN("Out of memory!\n");
  83                 return NULL;
  84         }
  85         nbuf->size = size;
  86         memcpy(nbuf->pnt,buf,size);
  87         nbuf->next = NULL;
  88         nbuf->prev = mp->head;
  89         nbuf->pos = 0;
  90
  91         if(!mp->tail) {
  92                 mp->tail = nbuf;
  93         }
  94         else {
  95           mp->head->next = nbuf;
  96         }
  97
  98         mp->head = nbuf;
  99         mp->bsize += size;
 100
 101         return nbuf;
 102 }
 103
 104 static void remove_buf(struct mpstr *mp)
 105 {
 106   struct buf *buf = mp->tail;
 107
 108   mp->tail = buf->next;
 109   if(mp->tail)
 110     mp->tail->prev = NULL;
 111   else {
 112     mp->tail = mp->head = NULL;
 113   }
 114
 115   free(buf->pnt);
 116   free(buf);
 117
 118 }
 119
 120 static int read_buf_byte(struct mpstr *mp)
 121 {
 122         unsigned int b;
 123
 124         int pos;
 125
 126         pos = mp->tail->pos;
 127         while(pos >= mp->tail->size) {
 128                 remove_buf(mp);
 129                 pos = mp->tail->pos;
 130         }
 131
 132         b = mp->tail->pnt[pos];
 133         mp->bsize--;
 134         mp->tail->pos++;
 135
 136
 137         return b;
 138 }
 139
 140 static void read_head(struct mpstr *mp)
 141 {
 142         unsigned long head;
 143
 144         head = read_buf_byte(mp);
 145         head <<= 8;
 146         head |= read_buf_byte(mp);
 147         head <<= 8;
 148         head |= read_buf_byte(mp);
 149         head <<= 8;
 150         head |= read_buf_byte(mp);
 151
 152         mp->header = head;
 153 }
 154
 155 int decodeMP3(struct mpstr *mp,const unsigned char *in,int isize,unsigned char *out,
 156                 int osize,int *done)
 157 {
 158         int len;
 159
 160         if(osize < 4608) {
 161                 ERR("Output buffer too small\n");
 162                 return MP3_ERR;
 163         }
 164
 165         if(in) {
 166                 if(addbuf(mp,in,isize) == NULL) {
 167                         return MP3_ERR;
 168                 }
 169         }
 170
 171         /* First decode header */
 172         if(mp->framesize == 0) {
 173                 if(mp->bsize < 4) {
 174                         return MP3_NEED_MORE;
 175                 }
 176                 read_head(mp);
 177                 if (decode_header(&mp->fr,mp->header) == 0) {
 178                         return MP3_ERR;
 179                 }
 180                 mp->framesize = mp->fr.framesize;
 181         }
 182
 183         if(mp->fr.framesize > mp->bsize)
 184                 return MP3_NEED_MORE;
 185
 186         wordpointer = mp->bsspace[mp->bsnum] + 512;
 187         mp->bsnum = (mp->bsnum + 1) & 0x1;
 188         bitindex = 0;
 189
 190         len = 0;
 191         while(len < mp->framesize) {
 192                 int nlen;
 193                 int blen = mp->tail->size - mp->tail->pos;
 194                 if( (mp->framesize - len) <= blen) {
 195                   nlen = mp->framesize-len;
 196                 }
 197                 else {
 198                   nlen = blen;
 199                 }
 200                 memcpy(wordpointer+len,mp->tail->pnt+mp->tail->pos,nlen);
 201                 len += nlen;
 202                 mp->tail->pos += nlen;
 203                 mp->bsize -= nlen;
 204                 if(mp->tail->pos == mp->tail->size) {
 205                    remove_buf(mp);
 206                 }
 207         }
 208
 209         *done = 0;
 210         if(mp->fr.error_protection)
 211            getbits(16);
 212         switch(mp->fr.lay) {
 213           case 1:
 214             do_layer1(&mp->fr,out,done);
 215             break;
 216           case 2:
 217             do_layer2(&mp->fr,out,done);
 218             break;
 219           case 3:
 220             do_layer3(&mp->fr,out,done);
 221             break;
 222         }
 223
 224         mp->fsizeold = mp->framesize;
 225         mp->framesize = 0;
 226
 227         return MP3_OK;
 228 }
 229
 230 int set_pointer(struct mpstr *mp, long backstep)
 231 {
 232   unsigned char *bsbufold;
 233   if(mp->fsizeold < 0 && backstep > 0) {
 234     /* This is not a bug if we just did seeking, the first frame is dropped then */
 235     WARN("Can't step back %ld!\n",backstep);
 236     return MP3_ERR;
 237   }
 238   bsbufold = mp->bsspace[mp->bsnum] + 512;
 239   wordpointer -= backstep;
 240   if (backstep)
 241     memcpy(wordpointer,bsbufold+mp->fsizeold-backstep,backstep);
 242   bitindex = 0;
 243   return MP3_OK;
 244 }