301 lines
6.7 KiB
C
301 lines
6.7 KiB
C
/* $NetBSD: msm6258.c,v 1.11 2003/09/07 04:24:07 isaki Exp $ */
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/*
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* Copyright (c) 2001 Tetsuya Isaki. 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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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* OKI MSM6258 ADPCM voice synthesizer codec.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: msm6258.c,v 1.11 2003/09/07 04:24:07 isaki Exp $");
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/select.h>
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#include <sys/audioio.h>
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#include <dev/audio_if.h>
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#include <dev/auconv.h>
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#include <dev/audiovar.h>
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#include <dev/mulaw.h>
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#include <dev/ic/msm6258var.h>
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struct msm6258_codecvar {
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/* ADPCM stream must be converted in order. */
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u_char mc_buf[AU_RING_SIZE]; /* XXX */
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short mc_amp;
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char mc_estim;
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};
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struct msm6258_softc {
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struct device sc_dev;
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struct msm6258_codecvar *sc_mc;
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/* MD vars follow */
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};
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static inline u_char pcm2adpcm_step(struct msm6258_codecvar *, short);
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static inline short adpcm2pcm_step(struct msm6258_codecvar *, u_char);
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static int adpcm_estimindex[16] = {
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2, 6, 10, 14, 18, 22, 26, 30,
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-2, -6, -10, -14, -18, -22, -26, -30
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};
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static int adpcm_estim[49] = {
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16, 17, 19, 21, 23, 25, 28, 31, 34, 37,
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41, 45, 50, 55, 60, 66, 73, 80, 88, 97,
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107, 118, 130, 143, 157, 173, 190, 209, 230, 253,
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279, 307, 337, 371, 408, 449, 494, 544, 598, 658,
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724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552
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};
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static int adpcm_estimstep[16] = {
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-1, -1, -1, -1, 2, 4, 6, 8,
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-1, -1, -1, -1, 2, 4, 6, 8
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};
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void *
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msm6258_codec_init (void)
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{
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struct msm6258_codecvar *r;
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r = malloc (sizeof(*r), M_DEVBUF, M_NOWAIT);
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if (r == 0)
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return 0;
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r->mc_amp = r->mc_estim = 0;
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return r;
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}
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int
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msm6258_codec_open(void *hdl)
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{
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struct msm6258_softc *sc = hdl;
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struct msm6258_codecvar *mc = sc->sc_mc;
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mc->mc_amp = 0;
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mc->mc_estim = 0;
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return 0;
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}
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/*
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* signed 16bit linear PCM -> OkiADPCM
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*/
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static inline u_char
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pcm2adpcm_step(struct msm6258_codecvar *mc, short a)
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{
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int estim = (int)mc->mc_estim;
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int df;
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short dl, c;
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unsigned char b;
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unsigned char s;
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df = a - mc->mc_amp;
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dl = adpcm_estim[estim];
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c = (df / 16) * 8 / dl;
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if (df < 0) {
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b = (unsigned char)(-c) / 2;
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s = 0x08;
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} else {
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b = (unsigned char)(c) / 2;
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s = 0;
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}
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if (b > 7)
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b = 7;
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s |= b;
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mc->mc_amp += (short)(adpcm_estimindex[(int)s] * dl);
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estim += adpcm_estimstep[b];
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if (estim < 0)
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estim = 0;
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else if (estim > 48)
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estim = 48;
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mc->mc_estim = estim;
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return s;
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}
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void
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msm6258_slinear16_host_to_adpcm(void *hdl, u_char *p, int cc)
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{
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struct msm6258_softc *sc = hdl;
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struct msm6258_codecvar *mc = sc->sc_mc;
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short *s = (short *)p;
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int i;
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u_char f;
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for (i = 0; i < cc; i += 4) {
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f = pcm2adpcm_step(mc, *s++);
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f |= pcm2adpcm_step(mc, *s++) << 4;
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*p++ = f;
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}
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}
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void
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msm6258_slinear16_le_to_adpcm(void *hdl, u_char *p, int cc)
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{
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#if BYTE_ORDER == BIG_ENDIAN
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swap_bytes(hdl, p, cc);
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#endif
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msm6258_slinear16_host_to_adpcm(hdl, p, cc);
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}
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void
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msm6258_slinear16_be_to_adpcm(void *hdl, u_char *p, int cc)
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{
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#if BYTE_ORDER == LITTLE_ENDIAN
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swap_bytes(hdl, p, cc);
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#endif
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msm6258_slinear16_host_to_adpcm(hdl, p, cc);
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}
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void
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msm6258_slinear8_to_adpcm(void *hdl, u_char *p, int cc)
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{
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struct msm6258_softc *sc = hdl;
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struct msm6258_codecvar *mc = sc->sc_mc;
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u_char *s = p;
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int i;
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u_char f;
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for (i = 0; i < cc; i += 2) {
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f = pcm2adpcm_step(mc, (short)(*s++) * 256);
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f |= pcm2adpcm_step(mc, (short)(*s++) * 256) << 4;
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*p++ = f;
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}
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}
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void
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msm6258_ulinear8_to_adpcm(void *hdl, u_char *p, int cc)
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{
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change_sign8(hdl, p, cc);
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msm6258_slinear8_to_adpcm(hdl, p, cc);
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}
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void
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msm6258_mulaw_to_adpcm(void *hdl, u_char *p, int cc)
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{
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mulaw_to_slinear8(hdl, p, cc);
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msm6258_slinear8_to_adpcm(hdl, p, cc);
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}
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/*
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* OkiADPCM -> signed 16bit linear PCM
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*/
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static inline short
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adpcm2pcm_step(struct msm6258_codecvar *mc, u_char b)
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{
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int estim = (int)mc->mc_estim;
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mc->mc_amp += adpcm_estim[estim] * adpcm_estimindex[b];
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estim += adpcm_estimstep[b];
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if (estim < 0)
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estim = 0;
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else if (estim > 48)
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estim = 48;
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mc->mc_estim = estim;
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return mc->mc_amp;
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}
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void
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msm6258_adpcm_to_slinear16_host(void *hdl, u_char *p, int cc)
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{
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struct msm6258_softc *sc = hdl;
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struct msm6258_codecvar *mc = sc->sc_mc;
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short *d = (short *)p;
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int i;
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u_char a;
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/* XXX alignment ? */
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memcpy(mc->mc_buf, p, cc / 4);
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for (i = 0; i < cc / 4;) {
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a = mc->mc_buf[i++];
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*d++ = adpcm2pcm_step(mc, a & 0x0f);
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*d++ = adpcm2pcm_step(mc, (a >> 4) & 0x0f);
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}
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}
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void
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msm6258_adpcm_to_slinear16_le(void *hdl, u_char *p, int cc)
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{
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msm6258_adpcm_to_slinear16_host(hdl, p, cc);
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#if BYTE_ORDER == BIG_ENDIAN
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swap_bytes(hdl, p, cc);
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#endif
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}
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void
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msm6258_adpcm_to_slinear16_be(void *hdl, u_char *p, int cc)
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{
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msm6258_adpcm_to_slinear16_host(hdl, p, cc);
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#if BYTE_ORDER == LITTLE_ENDIAN
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swap_bytes(hdl, p, cc);
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#endif
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}
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void
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msm6258_adpcm_to_slinear8(void *hdl, u_char *p, int cc)
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{
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struct msm6258_softc *sc = hdl;
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struct msm6258_codecvar *mc = sc->sc_mc;
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char *d = (char *)p;
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int i;
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u_char a;
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/* cc may be even. XXX alignment ? */
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memcpy(mc->mc_buf, p, cc / 2);
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for (i = 0; i < cc / 2;) {
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a = mc->mc_buf[i++];
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*d++ = adpcm2pcm_step(mc, a & 0x0f) / 256;
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*d++ = adpcm2pcm_step(mc, (a >> 4) & 0x0f) / 256;
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}
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}
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void
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msm6258_adpcm_to_ulinear8(void *hdl, u_char *p, int cc)
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{
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msm6258_adpcm_to_slinear8(hdl, p, cc);
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change_sign8(hdl, p, cc);
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}
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void
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msm6258_adpcm_to_mulaw(void *hdl, u_char *p, int cc)
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{
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msm6258_adpcm_to_slinear8(hdl, p, cc);
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slinear8_to_mulaw(hdl, p, cc);
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}
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