152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
/* $NetBSD: auconv.c,v 1.2 1997/08/24 22:20:24 augustss Exp $ */
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/*
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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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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*/
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#include <sys/types.h>
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#include <sys/audioio.h>
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#include <machine/endian.h>
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#include <dev/auconv.h>
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define LO 0
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#define HI 1
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#else
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#define LO 1
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#define HI 0
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#endif
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void
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change_sign8(v, p, cc)
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void *v;
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u_char *p;
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int cc;
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{
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while (--cc >= 0) {
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*p ^= 0x80;
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++p;
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}
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}
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void
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change_sign16(v, p, cc)
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void *v;
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u_char *p;
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int cc;
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{
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while ((cc -= 2) >= 0) {
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p[HI] ^= 0x80;
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p += 2;
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}
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}
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void
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swap_bytes(v, p, cc)
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void *v;
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u_char *p;
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int cc;
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{
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u_char t;
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while ((cc -= 2) >= 0) {
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t = p[0];
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p[0] = p[1];
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p[1] = t;
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p += 2;
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}
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}
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void
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swap_bytes_change_sign16(v, p, cc)
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void *v;
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u_char *p;
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int cc;
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{
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u_char t;
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while ((cc -= 2) >= 0) {
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t = p[HI];
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p[HI] = p[LO] ^ 0x80;
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p[LO] = t;
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p += 2;
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}
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}
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void
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change_sign16_swap_bytes(v, p, cc)
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void *v;
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u_char *p;
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int cc;
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{
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u_char t;
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while ((cc -= 2) >= 0) {
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t = p[LO];
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p[LO] = p[HI] ^ 0x80;
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p[HI] = t;
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p += 2;
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}
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}
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void
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linear8_to_linear16(v, p, cc)
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void *v;
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u_char *p;
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int cc;
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{
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u_char *q = p;
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p += cc;
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q += cc * 2;
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while (--cc >= 0) {
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q -= 2;
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q[HI] = *--p;
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q[LO] = 0;
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}
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}
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void
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linear16_to_linear8(v, p, cc)
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void *v;
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u_char *p;
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int cc;
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{
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u_char *q = p;
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while ((cc -= 2) >= 0) {
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*q++ = p[HI];
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p += 2;
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}
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}
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