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