NetBSD/sys/dev/ic/msm6258.c

196 lines
4.8 KiB
C

/* $NetBSD: msm6258.c,v 1.5 2001/11/13 13:14:42 lukem Exp $ */
/*
* Copyright (c) 2001 Tetsuya Isaki. 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 Tetsuya Isaki.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* OKI MSM6258 ADPCM voice synthesizer codec.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: msm6258.c,v 1.5 2001/11/13 13:14:42 lukem Exp $");
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/select.h>
#include <sys/audioio.h>
#include <dev/audio_if.h>
#include <dev/audiovar.h>
#include <dev/auconv.h>
#include <dev/mulaw.h>
#include <dev/ic/msm6258var.h>
static inline u_char pcm2adpcm_step(short, short *, char *);
static inline void adpcm2pcm_step(u_char, short *, char *);
static int adpcm_estimindex[16] = {
125, 375, 625, 875, 1125, 1375, 1625, 1875,
-125, -375, -625, -875, -1125, -1375, -1625, -1875
};
static int adpcm_estim[49] = {
16, 17, 19, 21, 23, 25, 28, 31, 34, 37,
41, 45, 50, 55, 60, 66, 73, 80, 88, 97,
107, 118, 130, 143, 157, 173, 190, 209, 230, 253,
279, 307, 337, 371, 408, 449, 494, 544, 598, 658,
724, 796, 875, 963, 1060, 1166, 1282, 1411, 1552
};
static u_char adpcm_estimindex_correct[16] = {
-1, -1, -1, -1, 2, 4, 6, 8,
-1, -1, -1, -1, 2, 4, 6, 8
};
struct msm6258_codecvar {
short mc_amp;
char mc_estim;
};
struct msm6258_softc {
struct device sc_dev;
struct msm6258_codecvar *sc_mc;
/* MD vars follow */
};
void *
msm6258_codec_init (void)
{
struct msm6258_codecvar *r;
r = malloc (sizeof(*r), M_DEVBUF, M_NOWAIT);
if (r == 0)
return 0;
r->mc_amp = r->mc_estim = 0;
return r;
}
static inline u_char
pcm2adpcm_step(short a, short *y, char *x)
{
int c, d;
register unsigned char b;
a -= *y;
d = adpcm_estim[(int) *x];
c = a * 4 * 1000;
c /= d;
if (c < 0) {
b = (unsigned char)(-c/1000);
if (b >= 8)
b = 7;
b |= 0x08;
} else {
b = (unsigned char)(c/1000);
if (b >= 8)
b = 7;
}
*y += (short)(adpcm_estimindex[b] * d / 1000);
*x += adpcm_estimindex_correct[b];
if (*x < 0)
*x = 0;
else if (*x > 48)
*x = 48;
return b;
}
void
msm6258_ulinear8_to_adpcm(void *hdl, u_char *p, int cc)
{
struct msm6258_softc *sc = hdl;
struct msm6258_codecvar *mc = sc->sc_mc;
char *x = &(mc->mc_estim);
short *y = &(mc->mc_amp);
register int i;
u_char f;
for (i = 0; i < cc; i++) {
f = pcm2adpcm_step(p[i], y, x);
p[i] = f + (pcm2adpcm_step(p[i], y, x) << 4);
}
}
void
msm6258_mulaw_to_adpcm(void *hdl, u_char *p, int cc)
{
mulaw_to_ulinear8(hdl, p, cc);
msm6258_ulinear8_to_adpcm(hdl, p, cc);
}
static inline void
adpcm2pcm_step(u_char b, short *y, char *x)
{
*y += (short)(adpcm_estimindex[b] * adpcm_estim[(int) *x]);
*x += adpcm_estimindex_correct[b];
if (*x < 0)
*x = 0;
else if (*x > 48)
*x = 48;
}
/* ADPCM stream must be converted in order. */
u_char tmpbuf[AU_RING_SIZE]; /* XXX */
void
msm6258_adpcm_to_ulinear8(void *hdl, u_char *p, int cc)
{
struct msm6258_softc *sc = hdl;
struct msm6258_codecvar *mc = sc->sc_mc;
char *x = &(mc->mc_estim);
short *y = &(mc->mc_amp);
u_char a, b;
int i;
for (i = 0; i < cc;) {
a = *p;
p++;
b = a & 0x0f;
adpcm2pcm_step(b, y, x);
tmpbuf[i++] = *y;
b = a >> 4;
adpcm2pcm_step(b, y, x);
tmpbuf[i++] = *y;
}
memcpy(p, tmpbuf, cc*2);
}
void
msm6258_adpcm_to_mulaw(void *hdl, u_char *p, int cc)
{
msm6258_adpcm_to_ulinear8(hdl, p, cc);
ulinear8_to_mulaw(hdl, p, cc*2);
}