NetBSD/sys/arch/x68k/dev/adpcm.c

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1996-05-05 16:17:03 +04:00
/*
* Copyright (c) 1991-1993 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Computer Systems
* Engineering Group at Lawrence Berkeley Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
1997-10-13 18:22:22 +04:00
* $NetBSD: adpcm.c,v 1.2 1997/10/13 14:22:47 lukem Exp $
1996-05-05 16:17:03 +04:00
*/
#include "bsdaudio.h"
#if NBSDAUDIO > 0
#include <sys/param.h>
#include <sys/systm.h>
#include <x68k/dev/bsd_audiovar.h>
#include <x68k/dev/bsd_audioreg.h>
#include <x68k/dev/opmreg.h>
#include <machine/bsd_audioio.h>
#include <x68k/x68k/iodevice.h>
#define RATE_15K 15625
#define RATE_10K 10417
#define RATE_7K 7813
#define RATE_5K 5208
#define RATE_3K 3906
struct adpcm_l2r {
u_int low;
u_int rate;
u_char clk;
u_char den;
} l2r[5] = {
{ 13021, RATE_15K, ADPCM_CLOCK_8MHZ, ADPCM_RATE_512},
{ 9115, RATE_10K, ADPCM_CLOCK_8MHZ, ADPCM_RATE_768},
{ 6510, RATE_7K, ADPCM_CLOCK_8MHZ, ADPCM_RATE_1024},
{ 4557, RATE_5K, ADPCM_CLOCK_4MHZ, ADPCM_RATE_768},
{ 0, RATE_3K, ADPCM_CLOCK_4MHZ, ADPCM_RATE_1024}
};
u_int
adpcm_round_sr(rate)
u_int rate;
{
int i;
for (i = 0; i < 5; i++) {
if (rate >= l2r[i].low)
return (l2r[i].rate);
}
/*NOTREACHED*/
}
void
adpcm_set_sr(rate)
u_int rate;
{
int i;
for (i = 0; i < 5; i++) {
if (rate >= l2r[i].low) {
PPI.portc = (PPI.portc & 0xf0) | l2r[i].den;
adpcm_chgclk(l2r[i].clk);
return;
}
}
/*NOTREACHED*/
}
#endif