quakeforge-old/common/snd_next.c

/*
	snd_next.c

	(description)

	Copyright (C) 1996-1997  Id Software, Inc.
	Copyright (C) 1999,2000  contributors of the QuakeForge project
	Please see the file "AUTHORS" for a list of contributors

	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

	$Id$
*/

#include <quakedef.h>

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)
{
}