dlls/winemp3.acm/common.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 <ctype.h>
  21 #include <stdlib.h>
  22 #include <signal.h>
  23
  24 #include <sys/types.h>
  25 #ifdef HAVE_SYS_STAT_H
  26 # include <sys/stat.h>
  27 #endif
  28 #include <fcntl.h>
  29
  30 #include "mpg123.h"
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(mpeg3);
  34
  35 static const struct parameter param = { 1 , 1 , 0 , 0 };
  36
  37 static const int tabsel_123[2][3][16] = {
  38    { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
  39      {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
  40      {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },
  41
  42    { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
  43      {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
  44      {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
  45 };
  46
  47 static const long freqs[9] = { 44100, 48000, 32000,
  48                   22050, 24000, 16000 ,
  49                   11025 , 12000 , 8000 };
  50
  51 int bitindex;
  52 unsigned char *wordpointer;
  53 unsigned char *pcm_sample;
  54 int pcm_point = 0;
  55
  56
  57 #define HDRCMPMASK 0xfffffd00
  58
  59 static int head_check(unsigned long head)
  60 {
  61     if( (head & 0xffe00000) != 0xffe00000)
  62         return FALSE;
  63     if(!((head>>17)&3))
  64         return FALSE;
  65     if( ((head>>12)&0xf) == 0xf)
  66         return FALSE;
  67     if( ((head>>10)&0x3) == 0x3 )
  68         return FALSE;
  69     return TRUE;
  70 }
  71
  72
  73 /*
  74  * decode a header and write the information
  75  * into the frame structure
  76  */
  77 int decode_header(struct frame *fr,unsigned long newhead)
  78 {
  79     if(head_check(newhead) == FALSE)
  80       return (0);
  81
  82     if( newhead & (1<<20) ) {
  83       fr->lsf = (newhead & (1<<19)) ? 0x0 : 0x1;
  84       fr->mpeg25 = 0;
  85     }
  86     else {
  87       fr->lsf = 1;
  88       fr->mpeg25 = 1;
  89     }
  90
  91     fr->lay = 4-((newhead>>17)&3);
  92     if(fr->mpeg25) {
  93       fr->sampling_frequency = 6 + ((newhead>>10)&0x3);
  94     }
  95     else
  96       fr->sampling_frequency = ((newhead>>10)&0x3) + (fr->lsf*3);
  97     fr->error_protection = ((newhead>>16)&0x1)^0x1;
  98
  99     if(fr->mpeg25) /* allow Bitrate change for 2.5 ... */
 100       fr->bitrate_index = ((newhead>>12)&0xf);
 101
 102     fr->bitrate_index = ((newhead>>12)&0xf);
 103     fr->padding   = ((newhead>>9)&0x1);
 104     fr->extension = ((newhead>>8)&0x1);
 105     fr->mode      = ((newhead>>6)&0x3);
 106     fr->mode_ext  = ((newhead>>4)&0x3);
 107     fr->copyright = ((newhead>>3)&0x1);
 108     fr->original  = ((newhead>>2)&0x1);
 109     fr->emphasis  = newhead & 0x3;
 110
 111     fr->stereo    = (fr->mode == MPG_MD_MONO) ? 1 : 2;
 112
 113     if(!fr->bitrate_index)
 114     {
 115       FIXME("Free format not supported.\n");
 116       return (0);
 117     }
 118
 119     switch(fr->lay)
 120     {
 121       case 1:
 122 #ifdef LAYER1
 123 #if 0
 124         fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
 125                          (fr->mode_ext<<2)+4 : 32;
 126 #endif
 127         fr->framesize  = (long) tabsel_123[fr->lsf][0][fr->bitrate_index] * 12000;
 128         fr->framesize /= freqs[fr->sampling_frequency];
 129         fr->framesize  = ((fr->framesize+fr->padding)<<2)-4;
 130         break;
 131 #else
 132         FIXME("Layer 1 not supported!\n");
 133         return 0;
 134 #endif
 135       case 2:
 136 #ifdef LAYER2
 137 #if 0
 138         fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
 139                          (fr->mode_ext<<2)+4 : fr->II_sblimit;
 140 #endif
 141         fr->framesize = (long) tabsel_123[fr->lsf][1][fr->bitrate_index] * 144000;
 142         fr->framesize /= freqs[fr->sampling_frequency];
 143         fr->framesize += fr->padding - 4;
 144         break;
 145 #else
 146         FIXME("Layer 2 not supported!\n");
 147         return 0;
 148 #endif
 149       case 3:
 150 #if 0
 151         fr->do_layer = do_layer3;
 152         if(fr->lsf)
 153           ssize = (fr->stereo == 1) ? 9 : 17;
 154         else
 155           ssize = (fr->stereo == 1) ? 17 : 32;
 156 #endif
 157
 158 #if 0
 159         if(fr->error_protection)
 160           ssize += 2;
 161 #endif
 162           fr->framesize  = (long) tabsel_123[fr->lsf][2][fr->bitrate_index] * 144000;
 163           fr->framesize /= freqs[fr->sampling_frequency]<<(fr->lsf);
 164           fr->framesize = fr->framesize + fr->padding - 4;
 165         break;
 166       default:
 167         FIXME("Unknown layer type: %d\n", fr->lay);
 168         return (0);
 169     }
 170     return 1;
 171 }
 172
 173 #if 0
 174 void print_header(struct frame *fr)
 175 {
 176         static const char * const modes[4] = { "Stereo", "Joint-Stereo", "Dual-Channel", "Single-Channel" };
 177         static const char * const layers[4] = { "Unknown" , "I", "II", "III" };
 178
 179         FIXME("MPEG %s, Layer: %s, Freq: %ld, mode: %s, modext: %d, BPF : %d\n",
 180                 fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"),
 181                 layers[fr->lay],freqs[fr->sampling_frequency],
 182                 modes[fr->mode],fr->mode_ext,fr->framesize+4);
 183         FIXME("Channels: %d, copyright: %s, original: %s, CRC: %s, emphasis: %d.\n",
 184                 fr->stereo,fr->copyright?"Yes":"No",
 185                 fr->original?"Yes":"No",fr->error_protection?"Yes":"No",
 186                 fr->emphasis);
 187         FIXME("Bitrate: %d Kbits/s, Extension value: %d\n",
 188                 tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index],fr->extension);
 189 }
 190
 191 void print_header_compact(struct frame *fr)
 192 {
 193         static const char * const modes[4] = { "stereo", "joint-stereo", "dual-channel", "mono" };
 194         static const char * const layers[4] = { "Unknown" , "I", "II", "III" };
 195
 196         FIXME("MPEG %s layer %s, %d kbit/s, %ld Hz %s\n",
 197                 fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"),
 198                 layers[fr->lay],
 199                 tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index],
 200                 freqs[fr->sampling_frequency], modes[fr->mode]);
 201 }
 202
 203 #endif
 204
 205 unsigned int getbits(int number_of_bits)
 206 {
 207   unsigned long rval;
 208
 209   if(!number_of_bits)
 210     return 0;
 211
 212   {
 213     rval = wordpointer[0];
 214     rval <<= 8;
 215     rval |= wordpointer[1];
 216     rval <<= 8;
 217     rval |= wordpointer[2];
 218     rval <<= bitindex;
 219     rval &= 0xffffff;
 220
 221     bitindex += number_of_bits;
 222
 223     rval >>= (24-number_of_bits);
 224
 225     wordpointer += (bitindex>>3);
 226     bitindex &= 7;
 227   }
 228   return rval;
 229 }
 230
 231 unsigned int getbits_fast(int number_of_bits)
 232 {
 233   unsigned long rval;
 234
 235   {
 236     rval = wordpointer[0];
 237     rval <<= 8;
 238     rval |= wordpointer[1];
 239     rval <<= bitindex;
 240     rval &= 0xffff;
 241     bitindex += number_of_bits;
 242
 243     rval >>= (16-number_of_bits);
 244
 245     wordpointer += (bitindex>>3);
 246     bitindex &= 7;
 247   }
 248   return rval;
 249 }
 250
 251 unsigned int get1bit(void)
 252 {
 253   unsigned char rval;
 254   rval = *wordpointer << bitindex;
 255
 256   bitindex++;
 257   wordpointer += (bitindex>>3);
 258   bitindex &= 7;
 259
 260   return rval>>7;
 261 }