tables.h

SDL_mixer 是一个基于 SDL 的混音器

/* 

    TiMidity -- Experimental MIDI to WAVE converter
    Copyright (C) 1995 Tuukka Toivonen <[e-mail]>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    tables.h
*/

#ifdef LOOKUP_SINE
extern FLOAT_T sine(int x);
#else
#include <math.h>
#define sine(x) (sin((2*PI/1024.0) * (x)))
#endif

#define SINE_CYCLE_LENGTH 1024
extern int32 freq_table[];
extern double vol_table[];
extern double expr_table[];
extern double bend_fine[];
extern double bend_coarse[];
extern uint8 *_l2u; /* 13-bit PCM to 8-bit u-law */
extern uint8 _l2u_[]; /* used in LOOKUP_HACK */
#ifdef LOOKUP_HACK
extern int16 _u2l[];
extern int32 *mixup;
#ifdef LOOKUP_INTERPOLATION
extern int8 *iplookup;
#endif
#endif

extern void init_tables(void);

#define XMAPMAX 800
extern int xmap[XMAPMAX][5];