The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/feeder_eq.c

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    1 /*-
    2  * Copyright (c) 2008-2009 Ariff Abdullah <ariff@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 /*
   28  * feeder_eq: Parametric (compile time) Software Equalizer. Though accidental,
   29  *            it proves good enough for educational and general consumption.
   30  *
   31  * "Cookbook formulae for audio EQ biquad filter coefficients"
   32  *    by Robert Bristow-Johnson  <rbj@audioimagination.com>
   33  *    -  http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
   34  */
   35 
   36 #ifdef _KERNEL
   37 #ifdef HAVE_KERNEL_OPTION_HEADERS
   38 #include "opt_snd.h"
   39 #endif
   40 #include <dev/sound/pcm/sound.h>
   41 #include <dev/sound/pcm/pcm.h>
   42 #include "feeder_if.h"
   43 
   44 #define SND_USE_FXDIV
   45 #include "snd_fxdiv_gen.h"
   46 
   47 SND_DECLARE_FILE("$FreeBSD: stable/11/sys/dev/sound/pcm/feeder_eq.c 331722 2018-03-29 02:50:57Z eadler $");
   48 #endif
   49 
   50 #include "feeder_eq_gen.h"
   51 
   52 #define FEEDEQ_LEVELS                                                   \
   53         (((FEEDEQ_GAIN_MAX - FEEDEQ_GAIN_MIN) *                         \
   54         (FEEDEQ_GAIN_DIV / FEEDEQ_GAIN_STEP)) + 1)
   55 
   56 #define FEEDEQ_L2GAIN(v)                                                \
   57         ((int)min(((v) * FEEDEQ_LEVELS) / 100, FEEDEQ_LEVELS - 1))
   58 
   59 #define FEEDEQ_PREAMP_IPART(x)          (abs(x) >> FEEDEQ_GAIN_SHIFT)
   60 #define FEEDEQ_PREAMP_FPART(x)          (abs(x) & FEEDEQ_GAIN_FMASK)
   61 #define FEEDEQ_PREAMP_SIGNVAL(x)        ((x) < 0 ? -1 : 1)
   62 #define FEEDEQ_PREAMP_SIGNMARK(x)       (((x) < 0) ? '-' : '+')
   63 
   64 #define FEEDEQ_PREAMP_IMIN      -192
   65 #define FEEDEQ_PREAMP_IMAX      192
   66 #define FEEDEQ_PREAMP_FMIN      0
   67 #define FEEDEQ_PREAMP_FMAX      9
   68 
   69 #define FEEDEQ_PREAMP_INVALID   INT_MAX
   70 
   71 #define FEEDEQ_IF2PREAMP(i, f)                                          \
   72         ((abs(i) << FEEDEQ_GAIN_SHIFT) |                                \
   73         (((abs(f) / FEEDEQ_GAIN_STEP) * FEEDEQ_GAIN_STEP) &             \
   74         FEEDEQ_GAIN_FMASK))
   75 
   76 #define FEEDEQ_PREAMP_MIN                                               \
   77         (FEEDEQ_PREAMP_SIGNVAL(FEEDEQ_GAIN_MIN) *                       \
   78         FEEDEQ_IF2PREAMP(FEEDEQ_GAIN_MIN, 0))
   79 
   80 #define FEEDEQ_PREAMP_MAX                                               \
   81         (FEEDEQ_PREAMP_SIGNVAL(FEEDEQ_GAIN_MAX) *                       \
   82         FEEDEQ_IF2PREAMP(FEEDEQ_GAIN_MAX, 0))
   83 
   84 #define FEEDEQ_PREAMP_DEFAULT   FEEDEQ_IF2PREAMP(0, 0)
   85 
   86 #define FEEDEQ_PREAMP2IDX(v)                                            \
   87         ((int32_t)((FEEDEQ_GAIN_MAX * (FEEDEQ_GAIN_DIV /                \
   88         FEEDEQ_GAIN_STEP)) + (FEEDEQ_PREAMP_SIGNVAL(v) *                \
   89         FEEDEQ_PREAMP_IPART(v) * (FEEDEQ_GAIN_DIV /                     \
   90         FEEDEQ_GAIN_STEP)) + (FEEDEQ_PREAMP_SIGNVAL(v) *                \
   91         (FEEDEQ_PREAMP_FPART(v) / FEEDEQ_GAIN_STEP))))
   92 
   93 static int feeder_eq_exact_rate = 0;
   94 
   95 #ifdef _KERNEL
   96 static char feeder_eq_presets[] = FEEDER_EQ_PRESETS;
   97 SYSCTL_STRING(_hw_snd, OID_AUTO, feeder_eq_presets, CTLFLAG_RD,
   98     &feeder_eq_presets, 0, "compile-time eq presets");
   99 
  100 SYSCTL_INT(_hw_snd, OID_AUTO, feeder_eq_exact_rate, CTLFLAG_RWTUN,
  101     &feeder_eq_exact_rate, 0, "force exact rate validation");
  102 #endif
  103 
  104 struct feed_eq_info;
  105 
  106 typedef void (*feed_eq_t)(struct feed_eq_info *, uint8_t *, uint32_t);
  107 
  108 struct feed_eq_tone {
  109         intpcm_t o1[SND_CHN_MAX];
  110         intpcm_t o2[SND_CHN_MAX];
  111         intpcm_t i1[SND_CHN_MAX];
  112         intpcm_t i2[SND_CHN_MAX];
  113         int gain;
  114 };
  115 
  116 struct feed_eq_info {
  117         struct feed_eq_tone treble;
  118         struct feed_eq_tone bass;
  119         struct feed_eq_coeff *coeff;
  120         feed_eq_t biquad;
  121         uint32_t channels;
  122         uint32_t rate;
  123         uint32_t align;
  124         int32_t preamp;
  125         int state;
  126 };
  127 
  128 #if !defined(_KERNEL) && defined(FEEDEQ_ERR_CLIP)
  129 #define FEEDEQ_ERR_CLIP_CHECK(t, v)     do {                            \
  130         if ((v) < PCM_S32_MIN || (v) > PCM_S32_MAX)                     \
  131                 errx(1, "\n\n%s(): ["#t"] Sample clipping: %jd\n",      \
  132                     __func__, (intmax_t)(v));                           \
  133 } while (0)
  134 #else
  135 #define FEEDEQ_ERR_CLIP_CHECK(...)
  136 #endif
  137 
  138 #define FEEDEQ_CLAMP(v)         (((v) > PCM_S32_MAX) ? PCM_S32_MAX :    \
  139                                 (((v) < PCM_S32_MIN) ? PCM_S32_MIN :    \
  140                                   (v)))
  141 
  142 #define FEEDEQ_DECLARE(SIGN, BIT, ENDIAN)                                       \
  143 static void                                                                     \
  144 feed_eq_biquad_##SIGN##BIT##ENDIAN(struct feed_eq_info *info,                   \
  145     uint8_t *dst, uint32_t count)                                               \
  146 {                                                                               \
  147         struct feed_eq_coeff_tone *treble, *bass;                               \
  148         intpcm64_t w;                                                           \
  149         intpcm_t v;                                                             \
  150         uint32_t i, j;                                                          \
  151         int32_t pmul, pshift;                                                   \
  152                                                                                 \
  153         pmul = feed_eq_preamp[info->preamp].mul;                                \
  154         pshift = feed_eq_preamp[info->preamp].shift;                            \
  155                                                                                 \
  156         if (info->state == FEEDEQ_DISABLE) {                                    \
  157                 j = count * info->channels;                                     \
  158                 dst += j * PCM_##BIT##_BPS;                                     \
  159                 do {                                                            \
  160                         dst -= PCM_##BIT##_BPS;                                 \
  161                         v = _PCM_READ_##SIGN##BIT##_##ENDIAN(dst);              \
  162                         v = ((intpcm64_t)pmul * v) >> pshift;                   \
  163                         _PCM_WRITE_##SIGN##BIT##_##ENDIAN(dst, v);              \
  164                 } while (--j != 0);                                             \
  165                                                                                 \
  166                 return;                                                         \
  167         }                                                                       \
  168                                                                                 \
  169         treble = &(info->coeff[info->treble.gain].treble);                      \
  170         bass   = &(info->coeff[info->bass.gain].bass);                          \
  171                                                                                 \
  172         do {                                                                    \
  173                 i = 0;                                                          \
  174                 j = info->channels;                                             \
  175                 do {                                                            \
  176                         v = _PCM_READ_##SIGN##BIT##_##ENDIAN(dst);              \
  177                         v <<= 32 - BIT;                                         \
  178                         v = ((intpcm64_t)pmul * v) >> pshift;                   \
  179                                                                                 \
  180                         w  = (intpcm64_t)v * treble->b0;                        \
  181                         w += (intpcm64_t)info->treble.i1[i] * treble->b1;       \
  182                         w += (intpcm64_t)info->treble.i2[i] * treble->b2;       \
  183                         w -= (intpcm64_t)info->treble.o1[i] * treble->a1;       \
  184                         w -= (intpcm64_t)info->treble.o2[i] * treble->a2;       \
  185                         info->treble.i2[i] = info->treble.i1[i];                \
  186                         info->treble.i1[i] = v;                                 \
  187                         info->treble.o2[i] = info->treble.o1[i];                \
  188                         w >>= FEEDEQ_COEFF_SHIFT;                               \
  189                         FEEDEQ_ERR_CLIP_CHECK(treble, w);                       \
  190                         v = FEEDEQ_CLAMP(w);                                    \
  191                         info->treble.o1[i] = v;                                 \
  192                                                                                 \
  193                         w  = (intpcm64_t)v * bass->b0;                          \
  194                         w += (intpcm64_t)info->bass.i1[i] * bass->b1;           \
  195                         w += (intpcm64_t)info->bass.i2[i] * bass->b2;           \
  196                         w -= (intpcm64_t)info->bass.o1[i] * bass->a1;           \
  197                         w -= (intpcm64_t)info->bass.o2[i] * bass->a2;           \
  198                         info->bass.i2[i] = info->bass.i1[i];                    \
  199                         info->bass.i1[i] = v;                                   \
  200                         info->bass.o2[i] = info->bass.o1[i];                    \
  201                         w >>= FEEDEQ_COEFF_SHIFT;                               \
  202                         FEEDEQ_ERR_CLIP_CHECK(bass, w);                         \
  203                         v = FEEDEQ_CLAMP(w);                                    \
  204                         info->bass.o1[i] = v;                                   \
  205                                                                                 \
  206                         v >>= 32 - BIT;                                         \
  207                         _PCM_WRITE_##SIGN##BIT##_##ENDIAN(dst, v);              \
  208                         dst += PCM_##BIT##_BPS;                                 \
  209                         i++;                                                    \
  210                 } while (--j != 0);                                             \
  211         } while (--count != 0);                                                 \
  212 }
  213 
  214 #if BYTE_ORDER == LITTLE_ENDIAN || defined(SND_FEEDER_MULTIFORMAT)
  215 FEEDEQ_DECLARE(S, 16, LE)
  216 FEEDEQ_DECLARE(S, 32, LE)
  217 #endif
  218 #if BYTE_ORDER == BIG_ENDIAN || defined(SND_FEEDER_MULTIFORMAT)
  219 FEEDEQ_DECLARE(S, 16, BE)
  220 FEEDEQ_DECLARE(S, 32, BE)
  221 #endif
  222 #ifdef SND_FEEDER_MULTIFORMAT
  223 FEEDEQ_DECLARE(S,  8, NE)
  224 FEEDEQ_DECLARE(S, 24, LE)
  225 FEEDEQ_DECLARE(S, 24, BE)
  226 FEEDEQ_DECLARE(U,  8, NE)
  227 FEEDEQ_DECLARE(U, 16, LE)
  228 FEEDEQ_DECLARE(U, 24, LE)
  229 FEEDEQ_DECLARE(U, 32, LE)
  230 FEEDEQ_DECLARE(U, 16, BE)
  231 FEEDEQ_DECLARE(U, 24, BE)
  232 FEEDEQ_DECLARE(U, 32, BE)
  233 #endif
  234 
  235 #define FEEDEQ_ENTRY(SIGN, BIT, ENDIAN)                                 \
  236         {                                                               \
  237                 AFMT_##SIGN##BIT##_##ENDIAN,                            \
  238                 feed_eq_biquad_##SIGN##BIT##ENDIAN                      \
  239         }
  240 
  241 
  242 static const struct {
  243         uint32_t format;
  244         feed_eq_t biquad;
  245 } feed_eq_biquad_tab[] = {
  246 #if BYTE_ORDER == LITTLE_ENDIAN || defined(SND_FEEDER_MULTIFORMAT)
  247         FEEDEQ_ENTRY(S, 16, LE),
  248         FEEDEQ_ENTRY(S, 32, LE),
  249 #endif
  250 #if BYTE_ORDER == BIG_ENDIAN || defined(SND_FEEDER_MULTIFORMAT)
  251         FEEDEQ_ENTRY(S, 16, BE),
  252         FEEDEQ_ENTRY(S, 32, BE),
  253 #endif
  254 #ifdef SND_FEEDER_MULTIFORMAT
  255         FEEDEQ_ENTRY(S,  8, NE),
  256         FEEDEQ_ENTRY(S, 24, LE),
  257         FEEDEQ_ENTRY(S, 24, BE),
  258         FEEDEQ_ENTRY(U,  8, NE),
  259         FEEDEQ_ENTRY(U, 16, LE),
  260         FEEDEQ_ENTRY(U, 24, LE),
  261         FEEDEQ_ENTRY(U, 32, LE),
  262         FEEDEQ_ENTRY(U, 16, BE),
  263         FEEDEQ_ENTRY(U, 24, BE),
  264         FEEDEQ_ENTRY(U, 32, BE)
  265 #endif
  266 };
  267 
  268 #define FEEDEQ_BIQUAD_TAB_SIZE                                          \
  269         ((int32_t)(sizeof(feed_eq_biquad_tab) / sizeof(feed_eq_biquad_tab[0])))
  270 
  271 static struct feed_eq_coeff *
  272 feed_eq_coeff_rate(uint32_t rate)
  273 {
  274         uint32_t spd, threshold;
  275         int i;
  276 
  277         if (rate < FEEDEQ_RATE_MIN || rate > FEEDEQ_RATE_MAX)
  278                 return (NULL);
  279 
  280         /*
  281          * Not all rates are supported. Choose the best rate that we can to
  282          * allow 'sloppy' conversion. Good enough for naive listeners.
  283          */
  284         for (i = 0; i < FEEDEQ_TAB_SIZE; i++) {
  285                 spd = feed_eq_tab[i].rate;
  286                 threshold = spd + ((i < (FEEDEQ_TAB_SIZE - 1) &&
  287                     feed_eq_tab[i + 1].rate > spd) ?
  288                     ((feed_eq_tab[i + 1].rate - spd) >> 1) : 0);
  289                 if (rate == spd ||
  290                     (feeder_eq_exact_rate == 0 && rate <= threshold))
  291                         return (feed_eq_tab[i].coeff);
  292         }
  293 
  294         return (NULL);
  295 }
  296 
  297 int
  298 feeder_eq_validrate(uint32_t rate)
  299 {
  300 
  301         if (feed_eq_coeff_rate(rate) != NULL)
  302                 return (1);
  303 
  304         return (0);
  305 }
  306 
  307 static void
  308 feed_eq_reset(struct feed_eq_info *info)
  309 {
  310         uint32_t i;
  311 
  312         for (i = 0; i < info->channels; i++) {
  313                 info->treble.i1[i] = 0;
  314                 info->treble.i2[i] = 0;
  315                 info->treble.o1[i] = 0;
  316                 info->treble.o2[i] = 0;
  317                 info->bass.i1[i] = 0;
  318                 info->bass.i2[i] = 0;
  319                 info->bass.o1[i] = 0;
  320                 info->bass.o2[i] = 0;
  321         }
  322 }
  323 
  324 static int
  325 feed_eq_setup(struct feed_eq_info *info)
  326 {
  327 
  328         info->coeff = feed_eq_coeff_rate(info->rate);
  329         if (info->coeff == NULL)
  330                 return (EINVAL);
  331 
  332         feed_eq_reset(info);
  333 
  334         return (0);
  335 }
  336 
  337 static int
  338 feed_eq_init(struct pcm_feeder *f)
  339 {
  340         struct feed_eq_info *info;
  341         feed_eq_t biquad_op;
  342         int i;
  343 
  344         if (f->desc->in != f->desc->out)
  345                 return (EINVAL);
  346 
  347         biquad_op = NULL;
  348 
  349         for (i = 0; i < FEEDEQ_BIQUAD_TAB_SIZE && biquad_op == NULL; i++) {
  350                 if (AFMT_ENCODING(f->desc->in) == feed_eq_biquad_tab[i].format)
  351                         biquad_op = feed_eq_biquad_tab[i].biquad;
  352         }
  353 
  354         if (biquad_op == NULL)
  355                 return (EINVAL);
  356 
  357         info = malloc(sizeof(*info), M_DEVBUF, M_NOWAIT | M_ZERO);
  358         if (info == NULL)
  359                 return (ENOMEM);
  360 
  361         info->channels = AFMT_CHANNEL(f->desc->in);
  362         info->align = info->channels * AFMT_BPS(f->desc->in);
  363 
  364         info->rate = FEEDEQ_RATE_MIN;
  365         info->treble.gain = FEEDEQ_L2GAIN(50);
  366         info->bass.gain = FEEDEQ_L2GAIN(50);
  367         info->preamp = FEEDEQ_PREAMP2IDX(FEEDEQ_PREAMP_DEFAULT);
  368         info->state = FEEDEQ_UNKNOWN;
  369 
  370         info->biquad = biquad_op;
  371 
  372         f->data = info;
  373 
  374         return (feed_eq_setup(info));
  375 }
  376 
  377 static int
  378 feed_eq_set(struct pcm_feeder *f, int what, int value)
  379 {
  380         struct feed_eq_info *info;
  381 
  382         info = f->data;
  383 
  384         switch (what) {
  385         case FEEDEQ_CHANNELS:
  386                 if (value < SND_CHN_MIN || value > SND_CHN_MAX)
  387                         return (EINVAL);
  388                 info->channels = (uint32_t)value;
  389                 info->align = info->channels * AFMT_BPS(f->desc->in);
  390                 feed_eq_reset(info);
  391                 break;
  392         case FEEDEQ_RATE:
  393                 if (feeder_eq_validrate(value) == 0)
  394                         return (EINVAL);
  395                 info->rate = (uint32_t)value;
  396                 if (info->state == FEEDEQ_UNKNOWN)
  397                         info->state = FEEDEQ_ENABLE;
  398                 return (feed_eq_setup(info));
  399                 break;
  400         case FEEDEQ_TREBLE:
  401         case FEEDEQ_BASS:
  402                 if (value < 0 || value > 100)
  403                         return (EINVAL);
  404                 if (what == FEEDEQ_TREBLE)
  405                         info->treble.gain = FEEDEQ_L2GAIN(value);
  406                 else
  407                         info->bass.gain = FEEDEQ_L2GAIN(value);
  408                 break;
  409         case FEEDEQ_PREAMP:
  410                 if (value < FEEDEQ_PREAMP_MIN || value > FEEDEQ_PREAMP_MAX)
  411                         return (EINVAL);
  412                 info->preamp = FEEDEQ_PREAMP2IDX(value);
  413                 break;
  414         case FEEDEQ_STATE:
  415                 if (!(value == FEEDEQ_BYPASS || value == FEEDEQ_ENABLE ||
  416                     value == FEEDEQ_DISABLE))
  417                         return (EINVAL);
  418                 info->state = value;
  419                 feed_eq_reset(info);
  420                 break;
  421         default:
  422                 return (EINVAL);
  423                 break;
  424         }
  425 
  426         return (0);
  427 }
  428 
  429 static int
  430 feed_eq_free(struct pcm_feeder *f)
  431 {
  432         struct feed_eq_info *info;
  433 
  434         info = f->data;
  435         if (info != NULL)
  436                 free(info, M_DEVBUF);
  437 
  438         f->data = NULL;
  439 
  440         return (0);
  441 }
  442 
  443 static int
  444 feed_eq_feed(struct pcm_feeder *f, struct pcm_channel *c, uint8_t *b,
  445     uint32_t count, void *source)
  446 {
  447         struct feed_eq_info *info;
  448         uint32_t j;
  449         uint8_t *dst;
  450 
  451         info = f->data;
  452 
  453         /*
  454          * 3 major states:
  455          *      FEEDEQ_BYPASS  - Bypass entirely, nothing happened.
  456          *      FEEDEQ_ENABLE  - Preamp+biquad filtering.
  457          *      FEEDEQ_DISABLE - Preamp only.
  458          */
  459         if (info->state == FEEDEQ_BYPASS)
  460                 return (FEEDER_FEED(f->source, c, b, count, source));
  461 
  462         dst = b;
  463         count = SND_FXROUND(count, info->align);
  464 
  465         do {
  466                 if (count < info->align)
  467                         break;
  468 
  469                 j = SND_FXDIV(FEEDER_FEED(f->source, c, dst, count, source),
  470                     info->align);
  471                 if (j == 0)
  472                         break;
  473 
  474                 info->biquad(info, dst, j);
  475 
  476                 j *= info->align;
  477                 dst += j;
  478                 count -= j;
  479 
  480         } while (count != 0);
  481 
  482         return (dst - b);
  483 }
  484 
  485 static struct pcm_feederdesc feeder_eq_desc[] = {
  486         { FEEDER_EQ, 0, 0, 0, 0 },
  487         { 0, 0, 0, 0, 0 }
  488 };
  489 
  490 static kobj_method_t feeder_eq_methods[] = {
  491         KOBJMETHOD(feeder_init,         feed_eq_init),
  492         KOBJMETHOD(feeder_free,         feed_eq_free),
  493         KOBJMETHOD(feeder_set,          feed_eq_set),
  494         KOBJMETHOD(feeder_feed,         feed_eq_feed),
  495         KOBJMETHOD_END
  496 };
  497 
  498 FEEDER_DECLARE(feeder_eq, NULL);
  499 
  500 static int32_t
  501 feed_eq_scan_preamp_arg(const char *s)
  502 {
  503         int r, i, f;
  504         size_t len;
  505         char buf[32];
  506 
  507         bzero(buf, sizeof(buf));
  508 
  509         /* XXX kind of ugly, but works for now.. */
  510 
  511         r = sscanf(s, "%d.%d", &i, &f);
  512 
  513         if (r == 1 && !(i < FEEDEQ_PREAMP_IMIN || i > FEEDEQ_PREAMP_IMAX)) {
  514                 snprintf(buf, sizeof(buf), "%c%d",
  515                     FEEDEQ_PREAMP_SIGNMARK(i), abs(i));
  516                 f = 0;
  517         } else if (r == 2 &&
  518             !(i < FEEDEQ_PREAMP_IMIN || i > FEEDEQ_PREAMP_IMAX ||
  519             f < FEEDEQ_PREAMP_FMIN || f > FEEDEQ_PREAMP_FMAX))
  520                 snprintf(buf, sizeof(buf), "%c%d.%d",
  521                     FEEDEQ_PREAMP_SIGNMARK(i), abs(i), f);
  522         else
  523                 return (FEEDEQ_PREAMP_INVALID);
  524 
  525         len = strlen(s);
  526         if (len > 2 && strcasecmp(s + len - 2, "dB") == 0)
  527                 strlcat(buf, "dB", sizeof(buf));
  528 
  529         if (i == 0 && *s == '-')
  530                 *buf = '-';
  531 
  532         if (strcasecmp(buf + ((*s >= '' && *s <= '9') ? 1 : 0), s) != 0)
  533                 return (FEEDEQ_PREAMP_INVALID);
  534 
  535         while ((f / FEEDEQ_GAIN_DIV) > 0)
  536                 f /= FEEDEQ_GAIN_DIV;
  537 
  538         return (((i < 0 || *buf == '-') ? -1 : 1) * FEEDEQ_IF2PREAMP(i, f));
  539 }
  540 
  541 #ifdef _KERNEL
  542 static int
  543 sysctl_dev_pcm_eq(SYSCTL_HANDLER_ARGS)
  544 {
  545         struct snddev_info *d;
  546         struct pcm_channel *c;
  547         struct pcm_feeder *f;
  548         int err, val, oval;
  549 
  550         d = oidp->oid_arg1;
  551         if (!PCM_REGISTERED(d))
  552                 return (ENODEV);
  553 
  554         PCM_LOCK(d);
  555         PCM_WAIT(d);
  556         if (d->flags & SD_F_EQ_BYPASSED)
  557                 val = 2;
  558         else if (d->flags & SD_F_EQ_ENABLED)
  559                 val = 1;
  560         else
  561                 val = 0;
  562         PCM_ACQUIRE(d);
  563         PCM_UNLOCK(d);
  564 
  565         oval = val;
  566         err = sysctl_handle_int(oidp, &val, 0, req);
  567 
  568         if (err == 0 && req->newptr != NULL && val != oval) {
  569                 if (!(val == 0 || val == 1 || val == 2)) {
  570                         PCM_RELEASE_QUICK(d);
  571                         return (EINVAL);
  572                 }
  573 
  574                 PCM_LOCK(d);
  575 
  576                 d->flags &= ~(SD_F_EQ_ENABLED | SD_F_EQ_BYPASSED);
  577                 if (val == 2) {
  578                         val = FEEDEQ_BYPASS;
  579                         d->flags |= SD_F_EQ_BYPASSED;
  580                 } else if (val == 1) {
  581                         val = FEEDEQ_ENABLE;
  582                         d->flags |= SD_F_EQ_ENABLED;
  583                 } else
  584                         val = FEEDEQ_DISABLE;
  585 
  586                 CHN_FOREACH(c, d, channels.pcm.busy) {
  587                         CHN_LOCK(c);
  588                         f = chn_findfeeder(c, FEEDER_EQ);
  589                         if (f != NULL)
  590                                 (void)FEEDER_SET(f, FEEDEQ_STATE, val);
  591                         CHN_UNLOCK(c);
  592                 }
  593 
  594                 PCM_RELEASE(d);
  595                 PCM_UNLOCK(d);
  596         } else
  597                 PCM_RELEASE_QUICK(d);
  598 
  599         return (err);
  600 }
  601 
  602 static int
  603 sysctl_dev_pcm_eq_preamp(SYSCTL_HANDLER_ARGS)
  604 {
  605         struct snddev_info *d;
  606         struct pcm_channel *c;
  607         struct pcm_feeder *f;
  608         int err, val, oval;
  609         char buf[32];
  610 
  611         d = oidp->oid_arg1;
  612         if (!PCM_REGISTERED(d))
  613                 return (ENODEV);
  614 
  615         PCM_LOCK(d);
  616         PCM_WAIT(d);
  617         val = d->eqpreamp;
  618         bzero(buf, sizeof(buf));
  619         (void)snprintf(buf, sizeof(buf), "%c%d.%ddB",
  620             FEEDEQ_PREAMP_SIGNMARK(val), FEEDEQ_PREAMP_IPART(val),
  621             FEEDEQ_PREAMP_FPART(val));
  622         PCM_ACQUIRE(d);
  623         PCM_UNLOCK(d);
  624 
  625         oval = val;
  626         err = sysctl_handle_string(oidp, buf, sizeof(buf), req);
  627 
  628         if (err == 0 && req->newptr != NULL) {
  629                 val = feed_eq_scan_preamp_arg(buf);
  630                 if (val == FEEDEQ_PREAMP_INVALID) {
  631                         PCM_RELEASE_QUICK(d);
  632                         return (EINVAL);
  633                 }
  634 
  635                 PCM_LOCK(d);
  636 
  637                 if (val != oval) {
  638                         if (val < FEEDEQ_PREAMP_MIN)
  639                                 val = FEEDEQ_PREAMP_MIN;
  640                         else if (val > FEEDEQ_PREAMP_MAX)
  641                                 val = FEEDEQ_PREAMP_MAX;
  642 
  643                         d->eqpreamp = val;
  644 
  645                         CHN_FOREACH(c, d, channels.pcm.busy) {
  646                                 CHN_LOCK(c);
  647                                 f = chn_findfeeder(c, FEEDER_EQ);
  648                                 if (f != NULL)
  649                                         (void)FEEDER_SET(f, FEEDEQ_PREAMP, val);
  650                                 CHN_UNLOCK(c);
  651                         }
  652 
  653                 }
  654 
  655                 PCM_RELEASE(d);
  656                 PCM_UNLOCK(d);
  657         } else
  658                 PCM_RELEASE_QUICK(d);
  659 
  660         return (err);
  661 }
  662 
  663 void
  664 feeder_eq_initsys(device_t dev)
  665 {
  666         struct snddev_info *d;
  667         const char *preamp;
  668         char buf[64];
  669 
  670         d = device_get_softc(dev);
  671 
  672         if (!(resource_string_value(device_get_name(dev), device_get_unit(dev),
  673             "eq_preamp", &preamp) == 0 &&
  674             (d->eqpreamp = feed_eq_scan_preamp_arg(preamp)) !=
  675             FEEDEQ_PREAMP_INVALID))
  676                 d->eqpreamp = FEEDEQ_PREAMP_DEFAULT;
  677 
  678         if (d->eqpreamp < FEEDEQ_PREAMP_MIN)
  679                 d->eqpreamp = FEEDEQ_PREAMP_MIN;
  680         else if (d->eqpreamp > FEEDEQ_PREAMP_MAX)
  681                 d->eqpreamp = FEEDEQ_PREAMP_MAX;
  682 
  683         SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
  684             SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
  685             "eq", CTLTYPE_INT | CTLFLAG_RWTUN, d, sizeof(d),
  686             sysctl_dev_pcm_eq, "I",
  687             "Bass/Treble Equalizer (0=disable, 1=enable, 2=bypass)");
  688 
  689         (void)snprintf(buf, sizeof(buf), "Bass/Treble Equalizer Preamp "
  690             "(-/+ %d.0dB , %d.%ddB step)",
  691             FEEDEQ_GAIN_MAX, FEEDEQ_GAIN_STEP / FEEDEQ_GAIN_DIV,
  692             FEEDEQ_GAIN_STEP - ((FEEDEQ_GAIN_STEP / FEEDEQ_GAIN_DIV) *
  693             FEEDEQ_GAIN_DIV));
  694 
  695         SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
  696             SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
  697             "eq_preamp", CTLTYPE_STRING | CTLFLAG_RWTUN, d, sizeof(d),
  698             sysctl_dev_pcm_eq_preamp, "A", buf);
  699 }
  700 #endif

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