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