quakeforge/nq/source/snd_next.c

/*
	snd_next.c

	@description@

	Copyright (C) 1996-1997  Id Software, Inc.

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif


extern int  desired_speed;
extern int  desired_bits;

qboolean
SNDDMA_Init (void)
{
	int         size;

	size = 16384 + sizeof (dma_t);

	shm = malloc (size);
	memset ((void *) shm, 0, size);

	shm->buffer = (char *) shm + sizeof (dma_t);

	shm->channels = 2;
	shm->speed = desired_speed;
	shm->samplebits = desired_bits;
	shm->samples = 16384 / (desired_bits / 8);
	shm->submission_chunk = 1;

	return true;
}

// return the current sample position (in mono samples read)
// inside the recirculating dma buffer
int
SNDDMA_GetDMAPos (void)
{
	shm->samplepos =
		(int) (realtime * shm->speed * shm->channels) & (shm->samples - 1);

	return shm->samplepos;
}

void
SNDDMA_Shutdown (void)
{
}