release/src/router/libvorbis/lib/lookups.pl

   1 #!/usr/bin/perl
   2 print <<'EOD';
   3 /********************************************************************
   4  *                                                                  *
   5  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
   6  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   7  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   8  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   9  *                                                                  *
  10  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
  11  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  12  *                                                                  *
  13  ********************************************************************
  14
  15   function: lookup data; generated by lookups.pl; edit there
  16   last mod: $Id: lookups.pl 13293 2007-07-24 00:09:47Z xiphmont $
  17
  18  ********************************************************************/
  19
  20 #ifndef _V_LOOKUP_DATA_H_
  21
  22 #ifdef FLOAT_LOOKUP
  23 EOD
  24
  25 $cos_sz=128;
  26 $invsq_sz=32;
  27 $invsq2exp_min=-32;
  28 $invsq2exp_max=32;
  29
  30 $fromdB_sz=35;
  31 $fromdB_shift=5;
  32 $fromdB2_shift=3;
  33
  34 $invsq_i_shift=10;
  35 $cos_i_shift=9;
  36 $delta_shift=6;
  37
  38 print "#define COS_LOOKUP_SZ $cos_sz\n";
  39 print "static float COS_LOOKUP[COS_LOOKUP_SZ+1]={\n";
  40
  41 for($i=0;$i<=$cos_sz;){
  42     print "\t";
  43     for($j=0;$j<4 && $i<=$cos_sz;$j++){
  44         printf "%+.13f,", cos(3.14159265358979323846*($i++)/$cos_sz) ;
  45     }
  46     print "\n";
  47 }
  48 print "};\n\n";
  49
  50 print "#define INVSQ_LOOKUP_SZ $invsq_sz\n";
  51 print "static float INVSQ_LOOKUP[INVSQ_LOOKUP_SZ+1]={\n";
  52
  53 for($i=0;$i<=$invsq_sz;){
  54     print "\t";
  55     for($j=0;$j<4 && $i<=$invsq_sz;$j++){
  56         my$indexmap=$i++/$invsq_sz*.5+.5;
  57         printf "%.12f,", 1./sqrt($indexmap);
  58     }
  59     print "\n";
  60 }
  61 print "};\n\n";
  62
  63 print "#define INVSQ2EXP_LOOKUP_MIN $invsq2exp_min\n";
  64 print "#define INVSQ2EXP_LOOKUP_MAX $invsq2exp_max\n";
  65 print "static float INVSQ2EXP_LOOKUP[INVSQ2EXP_LOOKUP_MAX-\\\n".
  66       "                              INVSQ2EXP_LOOKUP_MIN+1]={\n";
  67
  68 for($i=$invsq2exp_min;$i<=$invsq2exp_max;){
  69     print "\t";
  70     for($j=0;$j<4 && $i<=$invsq2exp_max;$j++){
  71         printf "%15.10g,", 2**($i++*-.5);
  72     }
  73     print "\n";
  74 }
  75 print "};\n\n#endif\n\n";
  76
  77
  78 # 0 to -140 dB
  79 $fromdB2_sz=1<<$fromdB_shift;
  80 $fromdB_gran=1<<($fromdB_shift-$fromdB2_shift);
  81 print "#define FROMdB_LOOKUP_SZ $fromdB_sz\n";
  82 print "#define FROMdB2_LOOKUP_SZ $fromdB2_sz\n";
  83 print "#define FROMdB_SHIFT $fromdB_shift\n";
  84 print "#define FROMdB2_SHIFT $fromdB2_shift\n";
  85 print "#define FROMdB2_MASK ".((1<<$fromdB_shift)-1)."\n";
  86
  87 print "static float FROMdB_LOOKUP[FROMdB_LOOKUP_SZ]={\n";
  88
  89 for($i=0;$i<$fromdB_sz;){
  90     print "\t";
  91     for($j=0;$j<4 && $i<$fromdB_sz;$j++){
  92         printf "%15.10g,", 10**(.05*(-$fromdB_gran*$i++));
  93     }
  94     print "\n";
  95 }
  96 print "};\n\n";
  97
  98 print "static float FROMdB2_LOOKUP[FROMdB2_LOOKUP_SZ]={\n";
  99
 100 for($i=0;$i<$fromdB2_sz;){
 101     print "\t";
 102     for($j=0;$j<4 && $i<$fromdB_sz;$j++){
 103         printf "%15.10g,", 10**(.05*(-$fromdB_gran/$fromdB2_sz*(.5+$i++)));
 104     }
 105     print "\n";
 106 }
 107 print "};\n\n#ifdef INT_LOOKUP\n\n";
 108
 109
 110 $iisz=0x10000>>$invsq_i_shift;
 111 print "#define INVSQ_LOOKUP_I_SHIFT $invsq_i_shift\n";
 112 print "#define INVSQ_LOOKUP_I_MASK ".(0x0ffff>>(16-$invsq_i_shift))."\n";
 113 print "static long INVSQ_LOOKUP_I[$iisz+1]={\n";
 114 for($i=0;$i<=$iisz;){
 115     print "\t";
 116     for($j=0;$j<4 && $i<=$iisz;$j++){
 117         my$indexmap=$i++/$iisz*.5+.5;
 118         printf "%8d,", int(1./sqrt($indexmap)*65536.+.5);
 119     }
 120     print "\n";
 121 }
 122 print "};\n\n";
 123
 124 $cisz=0x10000>>$cos_i_shift;
 125 print "#define COS_LOOKUP_I_SHIFT $cos_i_shift\n";
 126 print "#define COS_LOOKUP_I_MASK ".(0x0ffff>>(16-$cos_i_shift))."\n";
 127 print "#define COS_LOOKUP_I_SZ $cisz\n";
 128 print "static long COS_LOOKUP_I[COS_LOOKUP_I_SZ+1]={\n";
 129
 130 for($i=0;$i<=$cisz;){
 131     print "\t";
 132     for($j=0;$j<4 && $i<=$cisz;$j++){
 133         printf "%8d,", int(cos(3.14159265358979323846*($i++)/$cos_sz)*16384.+.5) ;
 134     }
 135     print "\n";
 136 }
 137 print "};\n\n";
 138
 139
 140 print "#endif\n\n#endif\n";
 141
 142