code.delx.au - pulseaudio/blob - polyp/g711.h

   1 #ifndef foog711hfoo
   2 #define foog711hfoo
   3
   4 /* g711.h - include for G711 u-law and a-law conversion routines
   5 **
   6 ** Copyright (C) 2001 Chris Bagwell
   7 **
   8 ** Permission to use, copy, modify, and distribute this software and its
   9 ** documentation for any purpose and without fee is hereby granted, provided
  10 ** that the above copyright notice appear in all copies and that both that
  11 ** copyright notice and this permission notice appear in supporting
  12 ** documentation.  This software is provided "as is" without express or
  13 ** implied warranty.
  14 */
  15
  16 /** Copied from sox -- Lennart Poettring*/
  17
  18 #include <inttypes.h>
  19
  20 #ifdef FAST_ALAW_CONVERSION
  21 extern uint8_t _st_13linear2alaw[0x2000];
  22 extern int16_t _st_alaw2linear16[256];
  23 #define st_13linear2alaw(sw) (_st_13linear2alaw[(sw + 0x1000)])
  24 #define st_alaw2linear16(uc) (_st_alaw2linear16[uc])
  25 #else
  26 unsigned char st_13linear2alaw(int16_t pcm_val);
  27 int16_t st_alaw2linear16(unsigned char);
  28 #endif
  29
  30 #ifdef FAST_ULAW_CONVERSION
  31 extern uint8_t _st_14linear2ulaw[0x4000];
  32 extern int16_t _st_ulaw2linear16[256];
  33 #define st_14linear2ulaw(sw) (_st_14linear2ulaw[(sw + 0x2000)])
  34 #define st_ulaw2linear16(uc) (_st_ulaw2linear16[uc])
  35 #else
  36 unsigned char st_14linear2ulaw(int16_t pcm_val);
  37 int16_t st_ulaw2linear16(unsigned char);
  38 #endif
  39
  40 #endif