Scilab [trunk]: scilab/modules/sound/src/c/libst.h Source File

00001 #ifndef __LIBST_H__
00002 #define __LIBST_H__
00003 
00004 /* libst.h - include file for portable sound tools library
00005 **
00006 ** Copyright (C) 1989 by Jef Poskanzer.
00007 **
00008 ** Permission to use, copy, modify, and distribute this software and its
00009 ** documentation for any purpose and without fee is hereby granted, provided
00010 ** that the above copyright notice appear in all copies and that both that
00011 ** copyright notice and this permission notice appear in supporting
00012 ** documentation.  This software is provided "as is" without express or
00013 ** implied warranty.
00014 */
00015 
00016 
00017 #define MINLIN -32768
00018 #define MAXLIN 32767
00019 #define LINCLIP(x) do { if ( x < MINLIN ) x = MINLIN ; else if ( x > MAXLIN ) x = MAXLIN; } while ( 0 )
00020 
00021 /* These do not round data.  Caller must round appropriately. */
00022 
00023 #ifdef FAST_ULAW_CONVERSION
00024 extern int ulaw_exp_table[256];
00025 extern unsigned char ulaw_comp_table[16384];
00026 #define st_ulaw_to_linear(ulawbyte) ulaw_exp_table[ulawbyte]
00027 #define st_linear_to_ulaw(linearword) ulaw_comp_table[(linearword / 4) & 0x3fff]
00028 #else
00029 unsigned char st_linear_to_ulaw(  int sample  );
00030 int st_ulaw_to_linear(  unsigned char ulawbyte  );
00031 #endif
00032 
00033 #ifdef FAST_ALAW_CONVERSION
00034 extern int Alaw_exp_table[256];
00035 extern unsigned char Alaw_comp_table[16384];
00036 #define st_Alaw_to_linear(Alawbyte) Alaw_exp_table[Alawbyte]
00037 #define st_linear_to_Alaw(linearword) Alaw_comp_table[(linearword / 4) & 0x3fff]
00038 #else
00039 unsigned char st_linear_to_Alaw(  int sample  );
00040 int st_Alaw_to_linear(  unsigned char ulawbyte  );
00041 #endif
00042 
00043 #ifdef  USG
00044 #define setbuffer(x,y,z)
00045 #endif
00046 
00047 #endif /*  __LIBST_H__ */