X-Git-Url: https://git.artsoft.org/?p=rocksndiamonds.git;a=blobdiff_plain;f=src%2Fgame_em%2Fulaw_generate.c;h=64488f6ab275f39d61c3bd763593ec12b7b897e9;hp=7c06c300226d17cfe3792a9f2bc71aa8aeeaba98;hb=3ff2e8a0b5c27b99a9920bdf5ed82bc41bf40181;hpb=7bf1759dc1f54495a7e16b32f08697b00661c32e

diff --git a/src/game_em/ulaw_generate.c b/src/game_em/ulaw_generate.c
index 7c06c300..64488f6a 100644
--- a/src/game_em/ulaw_generate.c
+++ b/src/game_em/ulaw_generate.c
@@ -5,132 +5,3 @@
  */
 
 #include "main_em.h"
-
-
-#if defined(PLATFORM_LINUX) || defined(PLATFORM_BSD)
-
-int calc_ulaw_to_linear(unsigned char);
-unsigned char calc_linear_to_ulaw(int);
-
-int buffer[65536];
-
-/* convert from 8 bit ulaw to signed 16 bit linear */
-short ulaw_to_linear[256];
-
-/* convert from signed 16 bit linear to 8 bit ulaw */
-unsigned char linear_to_ulaw[65536];
-
-void ulaw_generate()
-{
-  int i;
-
-  for(i = 0; i < 256; i++)
-    ulaw_to_linear[i] = calc_ulaw_to_linear(i);
-
-  for(i = -32768; i < 32768; i++)
-    linear_to_ulaw[i + 32768] = calc_linear_to_ulaw(i);
-}
-
-/*
-** This routine converts from ulaw to 16 bit linear.
-**
-** Craig Reese: IDA/Supercomputing Research Center
-** 29 September 1989
-**
-** References:
-** 1) CCITT Recommendation G.711  (very difficult to follow)
-** 2) MIL-STD-188-113,"Interoperability and Performance Standards
-**     for Analog-to_Digital Conversion Techniques,"
-**     17 February 1987
-**
-** Input: 8 bit ulaw sample
-** Output: signed 16 bit linear sample
-*/
-
-int calc_ulaw_to_linear(unsigned char ulawbyte)
-{
-  static int exp_lut[8] = { 0, 132, 396, 924, 1980, 4092, 8316, 16764 };
-  int sign, exponent, mantissa, sample;
-
-  ulawbyte = ~ ulawbyte;
-  sign = ( ulawbyte & 0x80 );
-  exponent = ( ulawbyte >> 4 ) & 0x07;
-  mantissa = ulawbyte & 0x0F;
-  sample = exp_lut[exponent] + ( mantissa << ( exponent + 3 ) );
-  if (sign != 0)
-    sample = -sample;
-
-  return(sample);
-}
-
-/*
-** This routine converts from linear to ulaw.
-**
-** Craig Reese: IDA/Supercomputing Research Center
-** Joe Campbell: Department of Defense
-** 29 September 1989
-**
-** References:
-** 1) CCITT Recommendation G.711  (very difficult to follow)
-** 2) "A New Digital Technique for Implementation of Any
-**     Continuous PCM Companding Law," Villeret, Michel,
-**     et al. 1973 IEEE Int. Conf. on Communications, Vol 1,
-**     1973, pg. 11.12-11.17
-** 3) MIL-STD-188-113,"Interoperability and Performance Standards
-**     for Analog-to_Digital Conversion Techniques,"
-**     17 February 1987
-**
-** Input: Signed 16 bit linear sample
-** Output: 8 bit ulaw sample
-*/
-
-#define ZEROTRAP    /* turn on the trap as per the MIL-STD */
-#define BIAS 0x84   /* define the add-in bias for 16 bit samples */
-#define CLIP 32635
-
-unsigned char calc_linear_to_ulaw(int sample)
-{
-  static int exp_lut[256] =
-  {
-    0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,
-    4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
-    5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
-    5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
-    6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
-    6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
-    6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
-    6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
-    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
-    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
-    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
-    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
-    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
-    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
-    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
-    7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
-  };
-
-  int sign, exponent, mantissa;
-  unsigned char ulawbyte;
-
-/* Get the sample into sign-magnitude. */
-  sign = (sample >> 8) & 0x80; /* set aside the sign */
-  if (sign != 0)
-    sample = -sample; /* get magnitude */
-  if (sample > CLIP)
-    sample = CLIP; /* clip the magnitude */
-
-/* Convert from 16 bit linear to ulaw. */
-  sample = sample + BIAS;
-  exponent = exp_lut[( sample >> 7 ) & 0xFF];
-  mantissa = ( sample >> ( exponent + 3 ) ) & 0x0F;
-  ulawbyte = ~ ( sign | ( exponent << 4 ) | mantissa );
-#ifdef ZEROTRAP
-  if (ulawbyte == 0)
-    ulawbyte = 0x02; /* optional CCITT trap */
-#endif
-
-  return(ulawbyte);
-}
-
-#endif /* defined(PLATFORM_LINUX) || defined(PLATFORM_BSD) */