msm6258.c revision 1.8
1 /* $NetBSD: msm6258.c,v 1.8 2002/04/02 15:22:38 isaki Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Tetsuya Isaki. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Tetsuya Isaki. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 27 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * OKI MSM6258 ADPCM voice synthesizer codec. 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: msm6258.c,v 1.8 2002/04/02 15:22:38 isaki Exp $"); 39 40 #include <sys/systm.h> 41 #include <sys/device.h> 42 #include <sys/malloc.h> 43 #include <sys/select.h> 44 #include <sys/audioio.h> 45 46 #include <dev/audio_if.h> 47 #include <dev/auconv.h> 48 #include <dev/audiovar.h> 49 #include <dev/mulaw.h> 50 #include <dev/ic/msm6258var.h> 51 52 53 static inline u_char pcm2adpcm_step(short, short *, char *); 54 static inline void adpcm2pcm_step(u_char, short *, char *); 55 56 57 static int adpcm_estimindex[16] = { 58 1, 3, 5, 7, 9, 11, 13, 15, 59 -1, -3, -5, -7, -9, -11, -13, -15 60 }; 61 62 static int adpcm_estim[49] = { 63 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 64 41, 45, 50, 55, 60, 66, 73, 80, 88, 97, 65 107, 118, 130, 143, 157, 173, 190, 209, 230, 253, 66 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 67 724, 796, 875, 963, 1060, 1166, 1282, 1411, 1552 68 }; 69 70 static u_char adpcm_estimindex_correct[16] = { 71 -1, -1, -1, -1, 2, 4, 6, 8, 72 -1, -1, -1, -1, 2, 4, 6, 8 73 }; 74 75 struct msm6258_codecvar { 76 short mc_amp; 77 char mc_estim; 78 }; 79 80 struct msm6258_softc { 81 struct device sc_dev; 82 struct msm6258_codecvar *sc_mc; 83 /* MD vars follow */ 84 }; 85 86 void * 87 msm6258_codec_init (void) 88 { 89 struct msm6258_codecvar *r; 90 91 r = malloc (sizeof(*r), M_DEVBUF, M_NOWAIT); 92 if (r == 0) 93 return 0; 94 r->mc_amp = r->mc_estim = 0; 95 96 return r; 97 } 98 99 int 100 msm6258_codec_open(void *hdl) 101 { 102 struct msm6258_softc *sc = hdl; 103 struct msm6258_codecvar *mc = sc->sc_mc; 104 105 mc->mc_amp = 0; 106 mc->mc_estim = 0; 107 108 return 0; 109 } 110 111 static inline u_char 112 pcm2adpcm_step(short a, short *y, char *x) 113 { 114 int c, d; 115 register unsigned char b; 116 117 a -= *y; 118 d = adpcm_estim[(int) *x]; 119 c = a * 4 / d; 120 121 if (c < 0) { 122 b = (unsigned char)-c; 123 if (b >= 8) 124 b = 7; 125 b |= 0x08; 126 } else { 127 b = (unsigned char)c; 128 if (b >= 8) 129 b = 7; 130 } 131 132 *y += (short)(adpcm_estimindex[b] * d / 8); 133 *x += adpcm_estimindex_correct[b]; 134 if (*x < 0) 135 *x = 0; 136 else if (*x > 48) 137 *x = 48; 138 return b; 139 } 140 141 void 142 msm6258_ulinear8_to_adpcm(void *hdl, u_char *p, int cc) 143 { 144 struct msm6258_softc *sc = hdl; 145 struct msm6258_codecvar *mc = sc->sc_mc; 146 char *x = &(mc->mc_estim); 147 short *y = &(mc->mc_amp); 148 register int i; 149 u_char *d = p; 150 u_char f; 151 152 for (i = 0; i < cc; ) { 153 f = pcm2adpcm_step(p[i++], y, x); 154 *d++ = f + (pcm2adpcm_step(p[i++], y, x) << 4); 155 } 156 } 157 158 void 159 msm6258_mulaw_to_adpcm(void *hdl, u_char *p, int cc) 160 { 161 mulaw_to_ulinear8(hdl, p, cc); 162 msm6258_ulinear8_to_adpcm(hdl, p, cc); 163 } 164 165 static inline void 166 adpcm2pcm_step(u_char b, short *y, char *x) 167 { 168 short dl; 169 short pcm = *y; 170 int estim = *x; 171 172 dl = adpcm_estim[estim] * adpcm_estimindex[b] / 8; 173 pcm += dl; 174 *y = pcm / 256; 175 176 estim += adpcm_estimindex_correct[b]; 177 if (estim < 0) 178 estim = 0; 179 if (estim > 48) 180 estim = 48; 181 *x = estim; 182 } 183 184 /* ADPCM stream must be converted in order. */ 185 u_char tmpbuf[AU_RING_SIZE]; /* XXX */ 186 187 void 188 msm6258_adpcm_to_ulinear8(void *hdl, u_char *p, int cc) 189 { 190 struct msm6258_softc *sc = hdl; 191 struct msm6258_codecvar *mc = sc->sc_mc; 192 char *x = &(mc->mc_estim); 193 short *y = &(mc->mc_amp); 194 u_char a, b; 195 int i; 196 197 /* cc may be even. XXX alignment? */ 198 memcpy(tmpbuf, p, cc/2); 199 for (i = 0; i < cc/2;) { 200 a = tmpbuf[i++]; 201 b = a & 0x0f; 202 adpcm2pcm_step(b, y, x); 203 *p++ = *y; 204 b = a >> 4; 205 adpcm2pcm_step(b, y, x); 206 *p++ = *y; 207 } 208 } 209 210 void 211 msm6258_adpcm_to_mulaw(void *hdl, u_char *p, int cc) 212 { 213 msm6258_adpcm_to_ulinear8(hdl, p, cc); 214 ulinear8_to_mulaw(hdl, p, cc*2); 215 } 216
Indexes created Mon Sep 29 21:09:56 GMT 2025