output.c
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TiMidity -- Experimental MIDI to WAVE converter
Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
This program is free software; you can redistribute it and/or modify
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it under the terms of the Perl Artistic License, available in COPYING.
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output.c
Audio output (to file / device) functions.
*/
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#if HAVE_CONFIG_H
# include <config.h>
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#endif
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#include "SDL.h"
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#include "options.h"
#include "output.h"
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/*****************************************************************/
/* Some functions to convert signed 32-bit data to other formats */
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void s32tos8(void *dp, Sint32 *lp, Sint32 c)
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Sint8 *cp=(Sint8 *)(dp);
Sint32 l;
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while (c--)
{
l=(*lp++)>>(32-8-GUARD_BITS);
if (l>127) l=127;
else if (l<-128) l=-128;
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*cp++ = (Sint8) (l);
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}
}
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void s32tou8(void *dp, Sint32 *lp, Sint32 c)
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Uint8 *cp=(Uint8 *)(dp);
Sint32 l;
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while (c--)
{
l=(*lp++)>>(32-8-GUARD_BITS);
if (l>127) l=127;
else if (l<-128) l=-128;
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*cp++ = 0x80 ^ ((Uint8) l);
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}
}
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void s32tos16(void *dp, Sint32 *lp, Sint32 c)
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Sint16 *sp=(Sint16 *)(dp);
Sint32 l;
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while (c--)
{
l=(*lp++)>>(32-16-GUARD_BITS);
if (l > 32767) l=32767;
else if (l<-32768) l=-32768;
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*sp++ = (Sint16)(l);
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}
}
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void s32tou16(void *dp, Sint32 *lp, Sint32 c)
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Uint16 *sp=(Uint16 *)(dp);
Sint32 l;
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while (c--)
{
l=(*lp++)>>(32-16-GUARD_BITS);
if (l > 32767) l=32767;
else if (l<-32768) l=-32768;
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*sp++ = 0x8000 ^ (Uint16)(l);
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}
}
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void s32tos16x(void *dp, Sint32 *lp, Sint32 c)
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Sint16 *sp=(Sint16 *)(dp);
Sint32 l;
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while (c--)
{
l=(*lp++)>>(32-16-GUARD_BITS);
if (l > 32767) l=32767;
else if (l<-32768) l=-32768;
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*sp++ = SDL_Swap16((Sint16)(l));
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}
}
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void s32tou16x(void *dp, Sint32 *lp, Sint32 c)
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Uint16 *sp=(Uint16 *)(dp);
Sint32 l;
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while (c--)
{
l=(*lp++)>>(32-16-GUARD_BITS);
if (l > 32767) l=32767;
else if (l<-32768) l=-32768;
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*sp++ = SDL_Swap16(0x8000 ^ (Uint16)(l));
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}
}
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void s32tof32(void *dp, Sint32 *lp, Sint32 c)
{
float *sp=(float *)(dp);
while (c--)
{
*sp++ = (float)(*lp++) / 2147483647.0f;
}
}
void s32tos32(void *dp, Sint32 *lp, Sint32 c)
{
Sint32 *sp=(Sint32 *)(dp);
while (c--)
{
*sp++ = (*lp++);
}
}
void s32tos32x(void *dp, Sint32 *lp, Sint32 c)
{
Sint32 *sp=(Sint32 *)(dp);
while (c--)
{
*sp++ = SDL_Swap32(*lp++);
}
}