94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* $NetBSD: adpcm.c,v 1.2 1997/10/13 14:22:47 lukem Exp $
|
|
*/
|
|
|
|
#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
|