ref: 3b89cf7fa3d1548b5b91133a11be2d4d88521bb1
dir: /libst.h/
/* libst.h - include file for portable sound tools library ** ** Copyright (C) 1989 ** ** Permission to use, copy, modify, and distribute this software and its ** documentation for any purpose and without fee is hereby granted, provided ** that the above copyright notice appear in all copies and that both that ** copyright notice and this permission notice appear in supporting ** documentation. This software is provided "as is" without express or ** implied warranty. */ /*******************************************************************/ /* Common function prototypes used internal to Sound Tools library */ /*******************************************************************/ /******************************************************************/ /* Define u-law and a-law functionsto convert to linear PCM data */ /* Can use faster lookup tables by using the appropriate defines. */ /******************************************************************/ #ifdef FAST_ULAW_CONVERSION extern const short ulaw_exp_table[256]; extern const unsigned char ulaw_comp_table[16384]; #define st_ulaw_to_linear(ulawbyte) ulaw_exp_table[ulawbyte] #define st_linear_to_ulaw(linearword) ulaw_comp_table[(unsigned short)linearword >> 2] #else unsigned char st_linear_to_ulaw(short) REGPARM(1); int st_ulaw_to_linear(unsigned char) REGPARM(1); #endif #ifdef FAST_ALAW_CONVERSION extern const short Alaw_exp_table[256]; extern const unsigned char Alaw_comp_table[16384]; #define st_Alaw_to_linear(Alawbyte) Alaw_exp_table[Alawbyte] #define st_linear_to_Alaw(linearword) Alaw_comp_table[(unsigned short)linearword >> 2] #else unsigned char st_linear_to_Alaw(short) REGPARM(1); int st_Alaw_to_linear(unsigned char) REGPARM(1); #endif