1 /* $NetBSD: msm6258.c,v 1.26 2019/05/08 13:40:18 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * OKI MSM6258 ADPCM voice synthesizer codec. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: msm6258.c,v 1.26 2019/05/08 13:40:18 isaki Exp $"); 34 35 #include <sys/systm.h> 36 #include <sys/device.h> 37 #include <sys/kmem.h> 38 #include <sys/select.h> 39 #include <sys/audioio.h> 40 41 #include <dev/audio/audio_if.h> 42 #include <dev/ic/msm6258var.h> 43 44 static inline uint8_t pcm2adpcm_step(struct msm6258_codecvar *, int16_t); 45 static inline int16_t adpcm2pcm_step(struct msm6258_codecvar *, uint8_t); 46 47 static const int adpcm_estimindex[16] = { 48 2, 6, 10, 14, 18, 22, 26, 30, 49 -2, -6, -10, -14, -18, -22, -26, -30 50 }; 51 52 static const int adpcm_estim[49] = { 53 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 54 41, 45, 50, 55, 60, 66, 73, 80, 88, 97, 55 107, 118, 130, 143, 157, 173, 190, 209, 230, 253, 56 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 57 724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552 58 }; 59 60 static const int adpcm_estimstep[16] = { 61 -1, -1, -1, -1, 2, 4, 6, 8, 62 -1, -1, -1, -1, 2, 4, 6, 8 63 }; 64 65 /* 66 * signed 16bit linear PCM -> OkiADPCM 67 */ 68 static inline uint8_t 69 pcm2adpcm_step(struct msm6258_codecvar *mc, int16_t a) 70 { 71 int estim = (int)mc->mc_estim; 72 int df; 73 short dl, c; 74 uint8_t b; 75 uint8_t s; 76 77 df = a - mc->mc_amp; 78 dl = adpcm_estim[estim]; 79 c = (df / 16) * 8 / dl; 80 if (df < 0) { 81 b = (unsigned char)(-c) / 2; 82 s = 0x08; 83 } else { 84 b = (unsigned char)(c) / 2; 85 s = 0; 86 } 87 if (b > 7) 88 b = 7; 89 s |= b; 90 mc->mc_amp += (short)(adpcm_estimindex[(int)s] * dl); 91 estim += adpcm_estimstep[b]; 92 if (estim < 0) 93 estim = 0; 94 else if (estim > 48) 95 estim = 48; 96 97 mc->mc_estim = estim; 98 return s; 99 } 100 101 void 102 msm6258_internal_to_adpcm(audio_filter_arg_t *arg) 103 { 104 struct msm6258_codecvar *mc; 105 const aint_t *src; 106 uint8_t *dst; 107 u_int sample_count; 108 u_int i; 109 110 KASSERT((arg->count & 1) == 0); 111 112 mc = arg->context; 113 src = arg->src; 114 dst = arg->dst; 115 sample_count = arg->count * arg->srcfmt->channels; 116 for (i = 0; i < sample_count / 2; i++) { 117 aint_t s; 118 uint8_t f; 119 120 s = *src++; 121 s >>= AUDIO_INTERNAL_BITS - 16; 122 f = pcm2adpcm_step(mc, s); 123 124 s = *src++; 125 s >>= AUDIO_INTERNAL_BITS - 16; 126 f |= pcm2adpcm_step(mc, s) << 4; 127 128 *dst++ = (uint8_t)f; 129 } 130 } 131 132 133 /* 134 * OkiADPCM -> signed 16bit linear PCM 135 */ 136 static inline int16_t 137 adpcm2pcm_step(struct msm6258_codecvar *mc, uint8_t b) 138 { 139 int estim = (int)mc->mc_estim; 140 141 mc->mc_amp += adpcm_estim[estim] * adpcm_estimindex[b]; 142 estim += adpcm_estimstep[b]; 143 144 if (estim < 0) 145 estim = 0; 146 else if (estim > 48) 147 estim = 48; 148 149 mc->mc_estim = estim; 150 151 return mc->mc_amp; 152 } 153 154 void 155 msm6258_adpcm_to_internal(audio_filter_arg_t *arg) 156 { 157 struct msm6258_codecvar *mc; 158 const uint8_t *src; 159 aint_t *dst; 160 u_int sample_count; 161 u_int i; 162 163 KASSERT((arg->count & 1) == 0); 164 165 mc = arg->context; 166 src = arg->src; 167 dst = arg->dst; 168 sample_count = arg->count * arg->srcfmt->channels; 169 for (i = 0; i < sample_count / 2; i++) { 170 uint8_t a = *src++; 171 aint_t s; 172 173 s = adpcm2pcm_step(mc, a & 0x0f); 174 s <<= AUDIO_INTERNAL_BITS - 16; 175 *dst++ = s; 176 177 s = adpcm2pcm_step(mc, a >> 4); 178 s <<= AUDIO_INTERNAL_BITS - 16; 179 *dst++ = s; 180 } 181 } 182