doom3-bfg/neo/libs/timidity/output.cpp

/* 

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
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.

output.c

Audio output (to file / device) functions.
*/

#include "config.h"
#include "output.h"
#include "tables.h"


#ifdef SDL
extern PlayMode sdl_play_mode;
#define DEFAULT_PLAY_MODE &sdl_play_mode
#endif

PlayMode *play_mode_list[] = {
#ifdef DEFAULT_PLAY_MODE
	DEFAULT_PLAY_MODE,
#endif
		0
};

#ifdef DEFAULT_PLAY_MODE
PlayMode *play_mode=DEFAULT_PLAY_MODE;
#endif

/*****************************************************************/
/* Some functions to convert signed 32-bit data to other formats */

void s32tos8(void *dp,  int32_t *lp,  int32_t c)
{
	int8_t *cp=(int8_t *)(dp);
	 int32_t l;
	while (c--)
	{
		l=(*lp++)>>(32-8-GUARD_BITS);
		if (l>127) l=127;
		else if (l<-128) l=-128;
		*cp++ = (int8_t) (l);
	}
}

void s32tou8(void *dp,  int32_t *lp,  int32_t c)
{
	uint8_t *cp=(uint8_t *)(dp);
	 int32_t l;
	while (c--)
	{
		l=(*lp++)>>(32-8-GUARD_BITS);
		if (l>127) l=127;
		else if (l<-128) l=-128;
		*cp++ = 0x80 ^ ((uint8_t) l);
	}
}

void s32tos16(void *dp,  int32_t *lp,  int32_t c)
{
	int16_t *sp=(int16_t *)(dp);
	 int32_t l;
	while (c--)
	{
		l=(*lp++)>>(32-16-GUARD_BITS);
		if (l > 32767) l=32767;
		else if (l<-32768) l=-32768;
		*sp++ = (int16_t)(l);
	}
}

void s32tou16(void *dp,  int32_t *lp,  int32_t c)
{
	uint16_t *sp=(uint16_t *)(dp);
	 int32_t l;
	while (c--)
	{
		l=(*lp++)>>(32-16-GUARD_BITS);
		if (l > 32767) l=32767;
		else if (l<-32768) l=-32768;
		*sp++ = 0x8000 ^ (uint16_t)(l);
	}
}

void s32tos16x(void *dp,  int32_t *lp,  int32_t c)
{
	int16_t *sp=(int16_t *)(dp);
	 int32_t l;
	while (c--)
	{
		l=(*lp++)>>(32-16-GUARD_BITS);
		if (l > 32767) l=32767;
		else if (l<-32768) l=-32768;
		*sp++ = XCHG_SHORT((int16_t)(l));
	}
}

void s32tou16x(void *dp,  int32_t *lp,  int32_t c)
{
	uint16_t *sp=(uint16_t *)(dp);
	 int32_t l;
	while (c--)
	{
		l=(*lp++)>>(32-16-GUARD_BITS);
		if (l > 32767) l=32767;
		else if (l<-32768) l=-32768;
		*sp++ = XCHG_SHORT(0x8000 ^ (uint16_t)(l));
	}
}

void s32toulaw(void *dp,  int32_t *lp,  int32_t c)
{
	uint8_t *up=(uint8_t *)(dp);
	 int32_t l;
	while (c--)
	{
		l=(*lp++)>>(32-13-GUARD_BITS);
		if (l > 4095) l=4095;
		else if (l<-4096) l=-4096;
		*up++ = _l2u[l];
	}
}