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_rate.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 /*
   30  * feeder_rate: (Codename: Z Resampler), which means any effort to create
   31  *              future replacement for this resampler are simply absurd unless
   32  *              the world decide to add new alphabet after Z.
   33  *
   34  * FreeBSD bandlimited sinc interpolator, technically based on
   35  * "Digital Audio Resampling" by Julius O. Smith III
   36  *  - http://ccrma.stanford.edu/~jos/resample/
   37  *
   38  * The Good:
   39  * + all out fixed point integer operations, no soft-float or anything like
   40  *   that.
   41  * + classic polyphase converters with high quality coefficient's polynomial
   42  *   interpolators.
   43  * + fast, faster, or the fastest of its kind.
   44  * + compile time configurable.
   45  * + etc etc..
   46  *
   47  * The Bad:
   48  * - The z, z_, and Z_ . Due to mental block (or maybe just 0x7a69), I
   49  *   couldn't think of anything simpler than that (feeder_rate_xxx is just
   50  *   too long). Expect possible clashes with other zitizens (any?).
   51  */
   52 
   53 #ifdef _KERNEL
   54 #ifdef HAVE_KERNEL_OPTION_HEADERS
   55 #include "opt_snd.h"
   56 #endif
   57 #include <dev/sound/pcm/sound.h>
   58 #include <dev/sound/pcm/pcm.h>
   59 #include "feeder_if.h"
   60 
   61 #define SND_USE_FXDIV
   62 #include "snd_fxdiv_gen.h"
   63 
   64 SND_DECLARE_FILE("$FreeBSD: stable/12/sys/dev/sound/pcm/feeder_rate.c 326255 2017-11-27 14:52:40Z pfg $");
   65 #endif
   66 
   67 #include "feeder_rate_gen.h"
   68 
   69 #if !defined(_KERNEL) && defined(SND_DIAGNOSTIC)
   70 #undef Z_DIAGNOSTIC
   71 #define Z_DIAGNOSTIC            1
   72 #elif defined(_KERNEL)
   73 #undef Z_DIAGNOSTIC
   74 #endif
   75 
   76 #ifndef Z_QUALITY_DEFAULT
   77 #define Z_QUALITY_DEFAULT       Z_QUALITY_LINEAR
   78 #endif
   79 
   80 #define Z_RESERVOIR             2048
   81 #define Z_RESERVOIR_MAX         131072
   82 
   83 #define Z_SINC_MAX              0x3fffff
   84 #define Z_SINC_DOWNMAX          48              /* 384000 / 8000 */
   85 
   86 #ifdef _KERNEL
   87 #define Z_POLYPHASE_MAX         183040          /* 286 taps, 640 phases */
   88 #else
   89 #define Z_POLYPHASE_MAX         1464320         /* 286 taps, 5120 phases */
   90 #endif
   91 
   92 #define Z_RATE_DEFAULT          48000
   93 
   94 #define Z_RATE_MIN              FEEDRATE_RATEMIN
   95 #define Z_RATE_MAX              FEEDRATE_RATEMAX
   96 #define Z_ROUNDHZ               FEEDRATE_ROUNDHZ
   97 #define Z_ROUNDHZ_MIN           FEEDRATE_ROUNDHZ_MIN
   98 #define Z_ROUNDHZ_MAX           FEEDRATE_ROUNDHZ_MAX
   99 
  100 #define Z_RATE_SRC              FEEDRATE_SRC
  101 #define Z_RATE_DST              FEEDRATE_DST
  102 #define Z_RATE_QUALITY          FEEDRATE_QUALITY
  103 #define Z_RATE_CHANNELS         FEEDRATE_CHANNELS
  104 
  105 #define Z_PARANOID              1
  106 
  107 #define Z_MULTIFORMAT           1
  108 
  109 #ifdef _KERNEL
  110 #undef Z_USE_ALPHADRIFT
  111 #define Z_USE_ALPHADRIFT        1
  112 #endif
  113 
  114 #define Z_FACTOR_MIN            1
  115 #define Z_FACTOR_MAX            Z_MASK
  116 #define Z_FACTOR_SAFE(v)        (!((v) < Z_FACTOR_MIN || (v) > Z_FACTOR_MAX))
  117 
  118 struct z_info;
  119 
  120 typedef void (*z_resampler_t)(struct z_info *, uint8_t *);
  121 
  122 struct z_info {
  123         int32_t rsrc, rdst;     /* original source / destination rates */
  124         int32_t src, dst;       /* rounded source / destination rates */
  125         int32_t channels;       /* total channels */
  126         int32_t bps;            /* bytes-per-sample */
  127         int32_t quality;        /* resampling quality */
  128 
  129         int32_t z_gx, z_gy;     /* interpolation / decimation ratio */
  130         int32_t z_alpha;        /* output sample time phase / drift */
  131         uint8_t *z_delay;       /* FIR delay line / linear buffer */
  132         int32_t *z_coeff;       /* FIR coefficients */
  133         int32_t *z_dcoeff;      /* FIR coefficients differences */
  134         int32_t *z_pcoeff;      /* FIR polyphase coefficients */
  135         int32_t z_scale;        /* output scaling */
  136         int32_t z_dx;           /* input sample drift increment */
  137         int32_t z_dy;           /* output sample drift increment */
  138 #ifdef Z_USE_ALPHADRIFT
  139         int32_t z_alphadrift;   /* alpha drift rate */
  140         int32_t z_startdrift;   /* buffer start position drift rate */
  141 #endif
  142         int32_t z_mask;         /* delay line full length mask */
  143         int32_t z_size;         /* half width of FIR taps */
  144         int32_t z_full;         /* full size of delay line */
  145         int32_t z_alloc;        /* largest allocated full size of delay line */
  146         int32_t z_start;        /* buffer processing start position */
  147         int32_t z_pos;          /* current position for the next feed */
  148 #ifdef Z_DIAGNOSTIC
  149         uint32_t z_cycle;       /* output cycle, purely for statistical */
  150 #endif
  151         int32_t z_maxfeed;      /* maximum feed to avoid 32bit overflow */
  152 
  153         z_resampler_t z_resample;
  154 };
  155 
  156 int feeder_rate_min = Z_RATE_MIN;
  157 int feeder_rate_max = Z_RATE_MAX;
  158 int feeder_rate_round = Z_ROUNDHZ;
  159 int feeder_rate_quality = Z_QUALITY_DEFAULT;
  160 
  161 static int feeder_rate_polyphase_max = Z_POLYPHASE_MAX;
  162 
  163 #ifdef _KERNEL
  164 static char feeder_rate_presets[] = FEEDER_RATE_PRESETS;
  165 SYSCTL_STRING(_hw_snd, OID_AUTO, feeder_rate_presets, CTLFLAG_RD,
  166     &feeder_rate_presets, 0, "compile-time rate presets");
  167 SYSCTL_INT(_hw_snd, OID_AUTO, feeder_rate_polyphase_max, CTLFLAG_RWTUN,
  168     &feeder_rate_polyphase_max, 0, "maximum allowable polyphase entries");
  169 
  170 static int
  171 sysctl_hw_snd_feeder_rate_min(SYSCTL_HANDLER_ARGS)
  172 {
  173         int err, val;
  174 
  175         val = feeder_rate_min;
  176         err = sysctl_handle_int(oidp, &val, 0, req);
  177 
  178         if (err != 0 || req->newptr == NULL || val == feeder_rate_min)
  179                 return (err);
  180 
  181         if (!(Z_FACTOR_SAFE(val) && val < feeder_rate_max))
  182                 return (EINVAL);
  183 
  184         feeder_rate_min = val;
  185 
  186         return (0);
  187 }
  188 SYSCTL_PROC(_hw_snd, OID_AUTO, feeder_rate_min, CTLTYPE_INT | CTLFLAG_RWTUN,
  189     0, sizeof(int), sysctl_hw_snd_feeder_rate_min, "I",
  190     "minimum allowable rate");
  191 
  192 static int
  193 sysctl_hw_snd_feeder_rate_max(SYSCTL_HANDLER_ARGS)
  194 {
  195         int err, val;
  196 
  197         val = feeder_rate_max;
  198         err = sysctl_handle_int(oidp, &val, 0, req);
  199 
  200         if (err != 0 || req->newptr == NULL || val == feeder_rate_max)
  201                 return (err);
  202 
  203         if (!(Z_FACTOR_SAFE(val) && val > feeder_rate_min))
  204                 return (EINVAL);
  205 
  206         feeder_rate_max = val;
  207 
  208         return (0);
  209 }
  210 SYSCTL_PROC(_hw_snd, OID_AUTO, feeder_rate_max, CTLTYPE_INT | CTLFLAG_RWTUN,
  211     0, sizeof(int), sysctl_hw_snd_feeder_rate_max, "I",
  212     "maximum allowable rate");
  213 
  214 static int
  215 sysctl_hw_snd_feeder_rate_round(SYSCTL_HANDLER_ARGS)
  216 {
  217         int err, val;
  218 
  219         val = feeder_rate_round;
  220         err = sysctl_handle_int(oidp, &val, 0, req);
  221 
  222         if (err != 0 || req->newptr == NULL || val == feeder_rate_round)
  223                 return (err);
  224 
  225         if (val < Z_ROUNDHZ_MIN || val > Z_ROUNDHZ_MAX)
  226                 return (EINVAL);
  227 
  228         feeder_rate_round = val - (val % Z_ROUNDHZ);
  229 
  230         return (0);
  231 }
  232 SYSCTL_PROC(_hw_snd, OID_AUTO, feeder_rate_round, CTLTYPE_INT | CTLFLAG_RWTUN,
  233     0, sizeof(int), sysctl_hw_snd_feeder_rate_round, "I",
  234     "sample rate converter rounding threshold");
  235 
  236 static int
  237 sysctl_hw_snd_feeder_rate_quality(SYSCTL_HANDLER_ARGS)
  238 {
  239         struct snddev_info *d;
  240         struct pcm_channel *c;
  241         struct pcm_feeder *f;
  242         int i, err, val;
  243 
  244         val = feeder_rate_quality;
  245         err = sysctl_handle_int(oidp, &val, 0, req);
  246 
  247         if (err != 0 || req->newptr == NULL || val == feeder_rate_quality)
  248                 return (err);
  249 
  250         if (val < Z_QUALITY_MIN || val > Z_QUALITY_MAX)
  251                 return (EINVAL);
  252 
  253         feeder_rate_quality = val;
  254 
  255         /*
  256          * Traverse all available channels on each device and try to
  257          * set resampler quality if and only if it is exist as
  258          * part of feeder chains and the channel is idle.
  259          */
  260         for (i = 0; pcm_devclass != NULL &&
  261             i < devclass_get_maxunit(pcm_devclass); i++) {
  262                 d = devclass_get_softc(pcm_devclass, i);
  263                 if (!PCM_REGISTERED(d))
  264                         continue;
  265                 PCM_LOCK(d);
  266                 PCM_WAIT(d);
  267                 PCM_ACQUIRE(d);
  268                 CHN_FOREACH(c, d, channels.pcm) {
  269                         CHN_LOCK(c);
  270                         f = chn_findfeeder(c, FEEDER_RATE);
  271                         if (f == NULL || f->data == NULL || CHN_STARTED(c)) {
  272                                 CHN_UNLOCK(c);
  273                                 continue;
  274                         }
  275                         (void)FEEDER_SET(f, FEEDRATE_QUALITY, val);
  276                         CHN_UNLOCK(c);
  277                 }
  278                 PCM_RELEASE(d);
  279                 PCM_UNLOCK(d);
  280         }
  281 
  282         return (0);
  283 }
  284 SYSCTL_PROC(_hw_snd, OID_AUTO, feeder_rate_quality, CTLTYPE_INT | CTLFLAG_RWTUN,
  285     0, sizeof(int), sysctl_hw_snd_feeder_rate_quality, "I",
  286     "sample rate converter quality ("__XSTRING(Z_QUALITY_MIN)"=low .. "
  287     __XSTRING(Z_QUALITY_MAX)"=high)");
  288 #endif  /* _KERNEL */
  289 
  290 
  291 /*
  292  * Resampler type.
  293  */
  294 #define Z_IS_ZOH(i)             ((i)->quality == Z_QUALITY_ZOH)
  295 #define Z_IS_LINEAR(i)          ((i)->quality == Z_QUALITY_LINEAR)
  296 #define Z_IS_SINC(i)            ((i)->quality > Z_QUALITY_LINEAR)
  297 
  298 /*
  299  * Macroses for accurate sample time drift calculations.
  300  *
  301  * gy2gx : given the amount of output, return the _exact_ required amount of
  302  *         input.
  303  * gx2gy : given the amount of input, return the _maximum_ amount of output
  304  *         that will be generated.
  305  * drift : given the amount of input and output, return the elapsed
  306  *         sample-time.
  307  */
  308 #define _Z_GCAST(x)             ((uint64_t)(x))
  309 
  310 #if defined(__GNUCLIKE_ASM) && defined(__i386__)
  311 /*
  312  * This is where i386 being beaten to a pulp. Fortunately this function is
  313  * rarely being called and if it is, it will decide the best (hopefully)
  314  * fastest way to do the division. If we can ensure that everything is dword
  315  * aligned, letting the compiler to call udivdi3 to do the division can be
  316  * faster compared to this.
  317  *
  318  * amd64 is the clear winner here, no question about it.
  319  */
  320 static __inline uint32_t
  321 Z_DIV(uint64_t v, uint32_t d)
  322 {
  323         uint32_t hi, lo, quo, rem;
  324 
  325         hi = v >> 32;
  326         lo = v & 0xffffffff;
  327 
  328         /*
  329          * As much as we can, try to avoid long division like a plague.
  330          */
  331         if (hi == 0)
  332                 quo = lo / d;
  333         else
  334                 __asm("divl %2"
  335                     : "=a" (quo), "=d" (rem)
  336                     : "r" (d), "" (lo), "1" (hi));
  337 
  338         return (quo);
  339 }
  340 #else
  341 #define Z_DIV(x, y)             ((x) / (y))
  342 #endif
  343 
  344 #define _Z_GY2GX(i, a, v)                                               \
  345         Z_DIV(((_Z_GCAST((i)->z_gx) * (v)) + ((i)->z_gy - (a) - 1)),    \
  346         (i)->z_gy)
  347 
  348 #define _Z_GX2GY(i, a, v)                                               \
  349         Z_DIV(((_Z_GCAST((i)->z_gy) * (v)) + (a)), (i)->z_gx)
  350 
  351 #define _Z_DRIFT(i, x, y)                                               \
  352         ((_Z_GCAST((i)->z_gy) * (x)) - (_Z_GCAST((i)->z_gx) * (y)))
  353 
  354 #define z_gy2gx(i, v)           _Z_GY2GX(i, (i)->z_alpha, v)
  355 #define z_gx2gy(i, v)           _Z_GX2GY(i, (i)->z_alpha, v)
  356 #define z_drift(i, x, y)        _Z_DRIFT(i, x, y)
  357 
  358 /*
  359  * Macroses for SINC coefficients table manipulations.. whatever.
  360  */
  361 #define Z_SINC_COEFF_IDX(i)     ((i)->quality - Z_QUALITY_LINEAR - 1)
  362 
  363 #define Z_SINC_LEN(i)                                                   \
  364         ((int32_t)(((uint64_t)z_coeff_tab[Z_SINC_COEFF_IDX(i)].len <<   \
  365             Z_SHIFT) / (i)->z_dy))
  366 
  367 #define Z_SINC_BASE_LEN(i)                                              \
  368         ((z_coeff_tab[Z_SINC_COEFF_IDX(i)].len - 1) >> (Z_DRIFT_SHIFT - 1))
  369 
  370 /*
  371  * Macroses for linear delay buffer operations. Alignment is not
  372  * really necessary since we're not using true circular buffer, but it
  373  * will help us guard against possible trespasser. To be honest,
  374  * the linear block operations does not need guarding at all due to
  375  * accurate drifting!
  376  */
  377 #define z_align(i, v)           ((v) & (i)->z_mask)
  378 #define z_next(i, o, v)         z_align(i, (o) + (v))
  379 #define z_prev(i, o, v)         z_align(i, (o) - (v))
  380 #define z_fetched(i)            (z_align(i, (i)->z_pos - (i)->z_start) - 1)
  381 #define z_free(i)               ((i)->z_full - (i)->z_pos)
  382 
  383 /*
  384  * Macroses for Bla Bla .. :)
  385  */
  386 #define z_copy(src, dst, sz)    (void)memcpy(dst, src, sz)
  387 #define z_feed(...)             FEEDER_FEED(__VA_ARGS__)
  388 
  389 static __inline uint32_t
  390 z_min(uint32_t x, uint32_t y)
  391 {
  392 
  393         return ((x < y) ? x : y);
  394 }
  395 
  396 static int32_t
  397 z_gcd(int32_t x, int32_t y)
  398 {
  399         int32_t w;
  400 
  401         while (y != 0) {
  402                 w = x % y;
  403                 x = y;
  404                 y = w;
  405         }
  406 
  407         return (x);
  408 }
  409 
  410 static int32_t
  411 z_roundpow2(int32_t v)
  412 {
  413         int32_t i;
  414 
  415         i = 1;
  416 
  417         /*
  418          * Let it overflow at will..
  419          */
  420         while (i > 0 && i < v)
  421                 i <<= 1;
  422 
  423         return (i);
  424 }
  425 
  426 /*
  427  * Zero Order Hold, the worst of the worst, an insult against quality,
  428  * but super fast.
  429  */
  430 static void
  431 z_feed_zoh(struct z_info *info, uint8_t *dst)
  432 {
  433 #if 0
  434         z_copy(info->z_delay +
  435             (info->z_start * info->channels * info->bps), dst,
  436             info->channels * info->bps);
  437 #else
  438         uint32_t cnt;
  439         uint8_t *src;
  440 
  441         cnt = info->channels * info->bps;
  442         src = info->z_delay + (info->z_start * cnt);
  443 
  444         /*
  445          * This is a bit faster than doing bcopy() since we're dealing
  446          * with possible unaligned samples.
  447          */
  448         do {
  449                 *dst++ = *src++;
  450         } while (--cnt != 0);
  451 #endif
  452 }
  453 
  454 /*
  455  * Linear Interpolation. This at least sounds better (perceptually) and fast,
  456  * but without any proper filtering which means aliasing still exist and
  457  * could become worst with a right sample. Interpolation centered within
  458  * Z_LINEAR_ONE between the present and previous sample and everything is
  459  * done with simple 32bit scaling arithmetic.
  460  */
  461 #define Z_DECLARE_LINEAR(SIGN, BIT, ENDIAN)                                     \
  462 static void                                                                     \
  463 z_feed_linear_##SIGN##BIT##ENDIAN(struct z_info *info, uint8_t *dst)            \
  464 {                                                                               \
  465         int32_t z;                                                              \
  466         intpcm_t x, y;                                                          \
  467         uint32_t ch;                                                            \
  468         uint8_t *sx, *sy;                                                       \
  469                                                                                 \
  470         z = ((uint32_t)info->z_alpha * info->z_dx) >> Z_LINEAR_UNSHIFT;         \
  471                                                                                 \
  472         sx = info->z_delay + (info->z_start * info->channels *                  \
  473             PCM_##BIT##_BPS);                                                   \
  474         sy = sx - (info->channels * PCM_##BIT##_BPS);                           \
  475                                                                                 \
  476         ch = info->channels;                                                    \
  477                                                                                 \
  478         do {                                                                    \
  479                 x = _PCM_READ_##SIGN##BIT##_##ENDIAN(sx);                       \
  480                 y = _PCM_READ_##SIGN##BIT##_##ENDIAN(sy);                       \
  481                 x = Z_LINEAR_INTERPOLATE_##BIT(z, x, y);                        \
  482                 _PCM_WRITE_##SIGN##BIT##_##ENDIAN(dst, x);                      \
  483                 sx += PCM_##BIT##_BPS;                                          \
  484                 sy += PCM_##BIT##_BPS;                                          \
  485                 dst += PCM_##BIT##_BPS;                                         \
  486         } while (--ch != 0);                                                    \
  487 }
  488 
  489 /*
  490  * Userland clipping diagnostic check, not enabled in kernel compilation.
  491  * While doing sinc interpolation, unrealistic samples like full scale sine
  492  * wav will clip, but for other things this will not make any noise at all.
  493  * Everybody should learn how to normalized perceived loudness of their own
  494  * music/sounds/samples (hint: ReplayGain).
  495  */
  496 #ifdef Z_DIAGNOSTIC
  497 #define Z_CLIP_CHECK(v, BIT)    do {                                    \
  498         if ((v) > PCM_S##BIT##_MAX) {                                   \
  499                 fprintf(stderr, "Overflow: v=%jd, max=%jd\n",           \
  500                     (intmax_t)(v), (intmax_t)PCM_S##BIT##_MAX);         \
  501         } else if ((v) < PCM_S##BIT##_MIN) {                            \
  502                 fprintf(stderr, "Underflow: v=%jd, min=%jd\n",          \
  503                     (intmax_t)(v), (intmax_t)PCM_S##BIT##_MIN);         \
  504         }                                                               \
  505 } while (0)
  506 #else
  507 #define Z_CLIP_CHECK(...)
  508 #endif
  509 
  510 #define Z_CLAMP(v, BIT)                                                 \
  511         (((v) > PCM_S##BIT##_MAX) ? PCM_S##BIT##_MAX :                  \
  512         (((v) < PCM_S##BIT##_MIN) ? PCM_S##BIT##_MIN : (v)))
  513 
  514 /*
  515  * Sine Cardinal (SINC) Interpolation. Scaling is done in 64 bit, so
  516  * there's no point to hold the plate any longer. All samples will be
  517  * shifted to a full 32 bit, scaled and restored during write for
  518  * maximum dynamic range (only for downsampling).
  519  */
  520 #define _Z_SINC_ACCUMULATE(SIGN, BIT, ENDIAN, adv)                      \
  521         c += z >> Z_SHIFT;                                              \
  522         z &= Z_MASK;                                                    \
  523         coeff = Z_COEFF_INTERPOLATE(z, z_coeff[c], z_dcoeff[c]);        \
  524         x = _PCM_READ_##SIGN##BIT##_##ENDIAN(p);                        \
  525         v += Z_NORM_##BIT((intpcm64_t)x * coeff);                       \
  526         z += info->z_dy;                                                \
  527         p adv##= info->channels * PCM_##BIT##_BPS
  528 
  529 /* 
  530  * XXX GCC4 optimization is such a !@#$%, need manual unrolling.
  531  */
  532 #if defined(__GNUC__) && __GNUC__ >= 4
  533 #define Z_SINC_ACCUMULATE(...)  do {                                    \
  534         _Z_SINC_ACCUMULATE(__VA_ARGS__);                                \
  535         _Z_SINC_ACCUMULATE(__VA_ARGS__);                                \
  536 } while (0)
  537 #define Z_SINC_ACCUMULATE_DECR          2
  538 #else
  539 #define Z_SINC_ACCUMULATE(...)  do {                                    \
  540         _Z_SINC_ACCUMULATE(__VA_ARGS__);                                \
  541 } while (0)
  542 #define Z_SINC_ACCUMULATE_DECR          1
  543 #endif
  544 
  545 #define Z_DECLARE_SINC(SIGN, BIT, ENDIAN)                                       \
  546 static void                                                                     \
  547 z_feed_sinc_##SIGN##BIT##ENDIAN(struct z_info *info, uint8_t *dst)              \
  548 {                                                                               \
  549         intpcm64_t v;                                                           \
  550         intpcm_t x;                                                             \
  551         uint8_t *p;                                                             \
  552         int32_t coeff, z, *z_coeff, *z_dcoeff;                                  \
  553         uint32_t c, center, ch, i;                                              \
  554                                                                                 \
  555         z_coeff = info->z_coeff;                                                \
  556         z_dcoeff = info->z_dcoeff;                                              \
  557         center = z_prev(info, info->z_start, info->z_size);                     \
  558         ch = info->channels * PCM_##BIT##_BPS;                                  \
  559         dst += ch;                                                              \
  560                                                                                 \
  561         do {                                                                    \
  562                 dst -= PCM_##BIT##_BPS;                                         \
  563                 ch -= PCM_##BIT##_BPS;                                          \
  564                 v = 0;                                                          \
  565                 z = info->z_alpha * info->z_dx;                                 \
  566                 c = 0;                                                          \
  567                 p = info->z_delay + (z_next(info, center, 1) *                  \
  568                     info->channels * PCM_##BIT##_BPS) + ch;                     \
  569                 for (i = info->z_size; i != 0; i -= Z_SINC_ACCUMULATE_DECR)     \
  570                         Z_SINC_ACCUMULATE(SIGN, BIT, ENDIAN, +);                \
  571                 z = info->z_dy - (info->z_alpha * info->z_dx);                  \
  572                 c = 0;                                                          \
  573                 p = info->z_delay + (center * info->channels *                  \
  574                     PCM_##BIT##_BPS) + ch;                                      \
  575                 for (i = info->z_size; i != 0; i -= Z_SINC_ACCUMULATE_DECR)     \
  576                         Z_SINC_ACCUMULATE(SIGN, BIT, ENDIAN, -);                \
  577                 if (info->z_scale != Z_ONE)                                     \
  578                         v = Z_SCALE_##BIT(v, info->z_scale);                    \
  579                 else                                                            \
  580                         v >>= Z_COEFF_SHIFT - Z_GUARD_BIT_##BIT;                \
  581                 Z_CLIP_CHECK(v, BIT);                                           \
  582                 _PCM_WRITE_##SIGN##BIT##_##ENDIAN(dst, Z_CLAMP(v, BIT));        \
  583         } while (ch != 0);                                                      \
  584 }
  585 
  586 #define Z_DECLARE_SINC_POLYPHASE(SIGN, BIT, ENDIAN)                             \
  587 static void                                                                     \
  588 z_feed_sinc_polyphase_##SIGN##BIT##ENDIAN(struct z_info *info, uint8_t *dst)    \
  589 {                                                                               \
  590         intpcm64_t v;                                                           \
  591         intpcm_t x;                                                             \
  592         uint8_t *p;                                                             \
  593         int32_t ch, i, start, *z_pcoeff;                                        \
  594                                                                                 \
  595         ch = info->channels * PCM_##BIT##_BPS;                                  \
  596         dst += ch;                                                              \
  597         start = z_prev(info, info->z_start, (info->z_size << 1) - 1) * ch;      \
  598                                                                                 \
  599         do {                                                                    \
  600                 dst -= PCM_##BIT##_BPS;                                         \
  601                 ch -= PCM_##BIT##_BPS;                                          \
  602                 v = 0;                                                          \
  603                 p = info->z_delay + start + ch;                                 \
  604                 z_pcoeff = info->z_pcoeff +                                     \
  605                     ((info->z_alpha * info->z_size) << 1);                      \
  606                 for (i = info->z_size; i != 0; i--) {                           \
  607                         x = _PCM_READ_##SIGN##BIT##_##ENDIAN(p);                \
  608                         v += Z_NORM_##BIT((intpcm64_t)x * *z_pcoeff);           \
  609                         z_pcoeff++;                                             \
  610                         p += info->channels * PCM_##BIT##_BPS;                  \
  611                         x = _PCM_READ_##SIGN##BIT##_##ENDIAN(p);                \
  612                         v += Z_NORM_##BIT((intpcm64_t)x * *z_pcoeff);           \
  613                         z_pcoeff++;                                             \
  614                         p += info->channels * PCM_##BIT##_BPS;                  \
  615                 }                                                               \
  616                 if (info->z_scale != Z_ONE)                                     \
  617                         v = Z_SCALE_##BIT(v, info->z_scale);                    \
  618                 else                                                            \
  619                         v >>= Z_COEFF_SHIFT - Z_GUARD_BIT_##BIT;                \
  620                 Z_CLIP_CHECK(v, BIT);                                           \
  621                 _PCM_WRITE_##SIGN##BIT##_##ENDIAN(dst, Z_CLAMP(v, BIT));        \
  622         } while (ch != 0);                                                      \
  623 }
  624 
  625 #define Z_DECLARE(SIGN, BIT, ENDIAN)                                    \
  626         Z_DECLARE_LINEAR(SIGN, BIT, ENDIAN)                             \
  627         Z_DECLARE_SINC(SIGN, BIT, ENDIAN)                               \
  628         Z_DECLARE_SINC_POLYPHASE(SIGN, BIT, ENDIAN)
  629 
  630 #if BYTE_ORDER == LITTLE_ENDIAN || defined(SND_FEEDER_MULTIFORMAT)
  631 Z_DECLARE(S, 16, LE)
  632 Z_DECLARE(S, 32, LE)
  633 #endif
  634 #if BYTE_ORDER == BIG_ENDIAN || defined(SND_FEEDER_MULTIFORMAT)
  635 Z_DECLARE(S, 16, BE)
  636 Z_DECLARE(S, 32, BE)
  637 #endif
  638 #ifdef SND_FEEDER_MULTIFORMAT
  639 Z_DECLARE(S,  8, NE)
  640 Z_DECLARE(S, 24, LE)
  641 Z_DECLARE(S, 24, BE)
  642 Z_DECLARE(U,  8, NE)
  643 Z_DECLARE(U, 16, LE)
  644 Z_DECLARE(U, 24, LE)
  645 Z_DECLARE(U, 32, LE)
  646 Z_DECLARE(U, 16, BE)
  647 Z_DECLARE(U, 24, BE)
  648 Z_DECLARE(U, 32, BE)
  649 #endif
  650 
  651 enum {
  652         Z_RESAMPLER_ZOH,
  653         Z_RESAMPLER_LINEAR,
  654         Z_RESAMPLER_SINC,
  655         Z_RESAMPLER_SINC_POLYPHASE,
  656         Z_RESAMPLER_LAST
  657 };
  658 
  659 #define Z_RESAMPLER_IDX(i)                                              \
  660         (Z_IS_SINC(i) ? Z_RESAMPLER_SINC : (i)->quality)
  661 
  662 #define Z_RESAMPLER_ENTRY(SIGN, BIT, ENDIAN)                                    \
  663         {                                                                       \
  664             AFMT_##SIGN##BIT##_##ENDIAN,                                        \
  665             {                                                                   \
  666                 [Z_RESAMPLER_ZOH]    = z_feed_zoh,                              \
  667                 [Z_RESAMPLER_LINEAR] = z_feed_linear_##SIGN##BIT##ENDIAN,       \
  668                 [Z_RESAMPLER_SINC]   = z_feed_sinc_##SIGN##BIT##ENDIAN,         \
  669                 [Z_RESAMPLER_SINC_POLYPHASE]   =                                \
  670                     z_feed_sinc_polyphase_##SIGN##BIT##ENDIAN                   \
  671             }                                                                   \
  672         }
  673 
  674 static const struct {
  675         uint32_t format;
  676         z_resampler_t resampler[Z_RESAMPLER_LAST];
  677 } z_resampler_tab[] = {
  678 #if BYTE_ORDER == LITTLE_ENDIAN || defined(SND_FEEDER_MULTIFORMAT)
  679         Z_RESAMPLER_ENTRY(S, 16, LE),
  680         Z_RESAMPLER_ENTRY(S, 32, LE),
  681 #endif
  682 #if BYTE_ORDER == BIG_ENDIAN || defined(SND_FEEDER_MULTIFORMAT)
  683         Z_RESAMPLER_ENTRY(S, 16, BE),
  684         Z_RESAMPLER_ENTRY(S, 32, BE),
  685 #endif
  686 #ifdef SND_FEEDER_MULTIFORMAT
  687         Z_RESAMPLER_ENTRY(S,  8, NE),
  688         Z_RESAMPLER_ENTRY(S, 24, LE),
  689         Z_RESAMPLER_ENTRY(S, 24, BE),
  690         Z_RESAMPLER_ENTRY(U,  8, NE),
  691         Z_RESAMPLER_ENTRY(U, 16, LE),
  692         Z_RESAMPLER_ENTRY(U, 24, LE),
  693         Z_RESAMPLER_ENTRY(U, 32, LE),
  694         Z_RESAMPLER_ENTRY(U, 16, BE),
  695         Z_RESAMPLER_ENTRY(U, 24, BE),
  696         Z_RESAMPLER_ENTRY(U, 32, BE),
  697 #endif
  698 };
  699 
  700 #define Z_RESAMPLER_TAB_SIZE                                            \
  701         ((int32_t)(sizeof(z_resampler_tab) / sizeof(z_resampler_tab[0])))
  702 
  703 static void
  704 z_resampler_reset(struct z_info *info)
  705 {
  706 
  707         info->src = info->rsrc - (info->rsrc % ((feeder_rate_round > 0 &&
  708             info->rsrc > feeder_rate_round) ? feeder_rate_round : 1));
  709         info->dst = info->rdst - (info->rdst % ((feeder_rate_round > 0 &&
  710             info->rdst > feeder_rate_round) ? feeder_rate_round : 1));
  711         info->z_gx = 1;
  712         info->z_gy = 1;
  713         info->z_alpha = 0;
  714         info->z_resample = NULL;
  715         info->z_size = 1;
  716         info->z_coeff = NULL;
  717         info->z_dcoeff = NULL;
  718         if (info->z_pcoeff != NULL) {
  719                 free(info->z_pcoeff, M_DEVBUF);
  720                 info->z_pcoeff = NULL;
  721         }
  722         info->z_scale = Z_ONE;
  723         info->z_dx = Z_FULL_ONE;
  724         info->z_dy = Z_FULL_ONE;
  725 #ifdef Z_DIAGNOSTIC
  726         info->z_cycle = 0;
  727 #endif
  728         if (info->quality < Z_QUALITY_MIN)
  729                 info->quality = Z_QUALITY_MIN;
  730         else if (info->quality > Z_QUALITY_MAX)
  731                 info->quality = Z_QUALITY_MAX;
  732 }
  733 
  734 #ifdef Z_PARANOID
  735 static int32_t
  736 z_resampler_sinc_len(struct z_info *info)
  737 {
  738         int32_t c, z, len, lmax;
  739 
  740         if (!Z_IS_SINC(info))
  741                 return (1);
  742 
  743         /*
  744          * A rather careful (or useless) way to calculate filter length.
  745          * Z_SINC_LEN() itself is accurate enough to do its job. Extra
  746          * sanity checking is not going to hurt though..
  747          */
  748         c = 0;
  749         z = info->z_dy;
  750         len = 0;
  751         lmax = z_coeff_tab[Z_SINC_COEFF_IDX(info)].len;
  752 
  753         do {
  754                 c += z >> Z_SHIFT;
  755                 z &= Z_MASK;
  756                 z += info->z_dy;
  757         } while (c < lmax && ++len > 0);
  758 
  759         if (len != Z_SINC_LEN(info)) {
  760 #ifdef _KERNEL
  761                 printf("%s(): sinc l=%d != Z_SINC_LEN=%d\n",
  762                     __func__, len, Z_SINC_LEN(info));
  763 #else
  764                 fprintf(stderr, "%s(): sinc l=%d != Z_SINC_LEN=%d\n",
  765                     __func__, len, Z_SINC_LEN(info));
  766                 return (-1);
  767 #endif
  768         }
  769 
  770         return (len);
  771 }
  772 #else
  773 #define z_resampler_sinc_len(i)         (Z_IS_SINC(i) ? Z_SINC_LEN(i) : 1)
  774 #endif
  775 
  776 #define Z_POLYPHASE_COEFF_SHIFT         0
  777 
  778 /*
  779  * Pick suitable polynomial interpolators based on filter oversampled ratio
  780  * (2 ^ Z_DRIFT_SHIFT).
  781  */
  782 #if !(defined(Z_COEFF_INTERP_ZOH) || defined(Z_COEFF_INTERP_LINEAR) ||          \
  783     defined(Z_COEFF_INTERP_QUADRATIC) || defined(Z_COEFF_INTERP_HERMITE) ||     \
  784     defined(Z_COEFF_INTER_BSPLINE) || defined(Z_COEFF_INTERP_OPT32X) ||         \
  785     defined(Z_COEFF_INTERP_OPT16X) || defined(Z_COEFF_INTERP_OPT8X) ||          \
  786     defined(Z_COEFF_INTERP_OPT4X) || defined(Z_COEFF_INTERP_OPT2X))
  787 #if Z_DRIFT_SHIFT >= 6
  788 #define Z_COEFF_INTERP_BSPLINE          1
  789 #elif Z_DRIFT_SHIFT >= 5
  790 #define Z_COEFF_INTERP_OPT32X           1
  791 #elif Z_DRIFT_SHIFT == 4
  792 #define Z_COEFF_INTERP_OPT16X           1
  793 #elif Z_DRIFT_SHIFT == 3
  794 #define Z_COEFF_INTERP_OPT8X            1
  795 #elif Z_DRIFT_SHIFT == 2
  796 #define Z_COEFF_INTERP_OPT4X            1
  797 #elif Z_DRIFT_SHIFT == 1
  798 #define Z_COEFF_INTERP_OPT2X            1
  799 #else
  800 #error "Z_DRIFT_SHIFT screwed!"
  801 #endif
  802 #endif
  803 
  804 /*
  805  * In classic polyphase mode, the actual coefficients for each phases need to
  806  * be calculated based on default prototype filters. For highly oversampled
  807  * filter, linear or quadradatic interpolator should be enough. Anything less
  808  * than that require 'special' interpolators to reduce interpolation errors.
  809  *
  810  * "Polynomial Interpolators for High-Quality Resampling of Oversampled Audio"
  811  *    by Olli Niemitalo
  812  *    - http://www.student.oulu.fi/~oniemita/dsp/deip.pdf
  813  *
  814  */
  815 static int32_t
  816 z_coeff_interpolate(int32_t z, int32_t *z_coeff)
  817 {
  818         int32_t coeff;
  819 #if defined(Z_COEFF_INTERP_ZOH)
  820 
  821         /* 1-point, 0th-order (Zero Order Hold) */
  822         z = z;
  823         coeff = z_coeff[0];
  824 #elif defined(Z_COEFF_INTERP_LINEAR)
  825         int32_t zl0, zl1;
  826 
  827         /* 2-point, 1st-order Linear */
  828         zl0 = z_coeff[0];
  829         zl1 = z_coeff[1] - z_coeff[0];
  830 
  831         coeff = Z_RSHIFT((int64_t)zl1 * z, Z_SHIFT) + zl0;
  832 #elif defined(Z_COEFF_INTERP_QUADRATIC)
  833         int32_t zq0, zq1, zq2;
  834 
  835         /* 3-point, 2nd-order Quadratic */
  836         zq0 = z_coeff[0];
  837         zq1 = z_coeff[1] - z_coeff[-1];
  838         zq2 = z_coeff[1] + z_coeff[-1] - (z_coeff[0] << 1);
  839 
  840         coeff = Z_RSHIFT((Z_RSHIFT((int64_t)zq2 * z, Z_SHIFT) +
  841             zq1) * z, Z_SHIFT + 1) + zq0;
  842 #elif defined(Z_COEFF_INTERP_HERMITE)
  843         int32_t zh0, zh1, zh2, zh3;
  844 
  845         /* 4-point, 3rd-order Hermite */
  846         zh0 = z_coeff[0];
  847         zh1 = z_coeff[1] - z_coeff[-1];
  848         zh2 = (z_coeff[-1] << 1) - (z_coeff[0] * 5) + (z_coeff[1] << 2) -
  849             z_coeff[2];
  850         zh3 = z_coeff[2] - z_coeff[-1] + ((z_coeff[0] - z_coeff[1]) * 3);
  851 
  852         coeff = Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((int64_t)zh3 * z, Z_SHIFT) +
  853             zh2) * z, Z_SHIFT) + zh1) * z, Z_SHIFT + 1) + zh0;
  854 #elif defined(Z_COEFF_INTERP_BSPLINE)
  855         int32_t zb0, zb1, zb2, zb3;
  856 
  857         /* 4-point, 3rd-order B-Spline */
  858         zb0 = Z_RSHIFT(0x15555555LL * (((int64_t)z_coeff[0] << 2) +
  859             z_coeff[-1] + z_coeff[1]), 30);
  860         zb1 = z_coeff[1] - z_coeff[-1];
  861         zb2 = z_coeff[-1] + z_coeff[1] - (z_coeff[0] << 1);
  862         zb3 = Z_RSHIFT(0x15555555LL * (((z_coeff[0] - z_coeff[1]) * 3) +
  863             z_coeff[2] - z_coeff[-1]), 30);
  864 
  865         coeff = (Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((int64_t)zb3 * z, Z_SHIFT) +
  866             zb2) * z, Z_SHIFT) + zb1) * z, Z_SHIFT) + zb0 + 1) >> 1;
  867 #elif defined(Z_COEFF_INTERP_OPT32X)
  868         int32_t zoz, zoe1, zoe2, zoe3, zoo1, zoo2, zoo3;
  869         int32_t zoc0, zoc1, zoc2, zoc3, zoc4, zoc5;
  870 
  871         /* 6-point, 5th-order Optimal 32x */
  872         zoz = z - (Z_ONE >> 1);
  873         zoe1 = z_coeff[1] + z_coeff[0];
  874         zoe2 = z_coeff[2] + z_coeff[-1];
  875         zoe3 = z_coeff[3] + z_coeff[-2];
  876         zoo1 = z_coeff[1] - z_coeff[0];
  877         zoo2 = z_coeff[2] - z_coeff[-1];
  878         zoo3 = z_coeff[3] - z_coeff[-2];
  879 
  880         zoc0 = Z_RSHIFT((0x1ac2260dLL * zoe1) + (0x0526cdcaLL * zoe2) +
  881             (0x00170c29LL * zoe3), 30);
  882         zoc1 = Z_RSHIFT((0x14f8a49aLL * zoo1) + (0x0d6d1109LL * zoo2) +
  883             (0x008cd4dcLL * zoo3), 30);
  884         zoc2 = Z_RSHIFT((-0x0d3e94a4LL * zoe1) + (0x0bddded4LL * zoe2) +
  885             (0x0160b5d0LL * zoe3), 30);
  886         zoc3 = Z_RSHIFT((-0x0de10cc4LL * zoo1) + (0x019b2a7dLL * zoo2) +
  887             (0x01cfe914LL * zoo3), 30);
  888         zoc4 = Z_RSHIFT((0x02aa12d7LL * zoe1) + (-0x03ff1bb3LL * zoe2) +
  889             (0x015508ddLL * zoe3), 30);
  890         zoc5 = Z_RSHIFT((0x051d29e5LL * zoo1) + (-0x028e7647LL * zoo2) +
  891             (0x0082d81aLL * zoo3), 30);
  892 
  893         coeff = Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT(
  894             (int64_t)zoc5 * zoz, Z_SHIFT) +
  895             zoc4) * zoz, Z_SHIFT) + zoc3) * zoz, Z_SHIFT) +
  896             zoc2) * zoz, Z_SHIFT) + zoc1) * zoz, Z_SHIFT) + zoc0;
  897 #elif defined(Z_COEFF_INTERP_OPT16X)
  898         int32_t zoz, zoe1, zoe2, zoe3, zoo1, zoo2, zoo3;
  899         int32_t zoc0, zoc1, zoc2, zoc3, zoc4, zoc5;
  900 
  901         /* 6-point, 5th-order Optimal 16x */
  902         zoz = z - (Z_ONE >> 1);
  903         zoe1 = z_coeff[1] + z_coeff[0];
  904         zoe2 = z_coeff[2] + z_coeff[-1];
  905         zoe3 = z_coeff[3] + z_coeff[-2];
  906         zoo1 = z_coeff[1] - z_coeff[0];
  907         zoo2 = z_coeff[2] - z_coeff[-1];
  908         zoo3 = z_coeff[3] - z_coeff[-2];
  909 
  910         zoc0 = Z_RSHIFT((0x1ac2260dLL * zoe1) + (0x0526cdcaLL * zoe2) +
  911             (0x00170c29LL * zoe3), 30);
  912         zoc1 = Z_RSHIFT((0x14f8a49aLL * zoo1) + (0x0d6d1109LL * zoo2) +
  913             (0x008cd4dcLL * zoo3), 30);
  914         zoc2 = Z_RSHIFT((-0x0d3e94a4LL * zoe1) + (0x0bddded4LL * zoe2) +
  915             (0x0160b5d0LL * zoe3), 30);
  916         zoc3 = Z_RSHIFT((-0x0de10cc4LL * zoo1) + (0x019b2a7dLL * zoo2) +
  917             (0x01cfe914LL * zoo3), 30);
  918         zoc4 = Z_RSHIFT((0x02aa12d7LL * zoe1) + (-0x03ff1bb3LL * zoe2) +
  919             (0x015508ddLL * zoe3), 30);
  920         zoc5 = Z_RSHIFT((0x051d29e5LL * zoo1) + (-0x028e7647LL * zoo2) +
  921             (0x0082d81aLL * zoo3), 30);
  922 
  923         coeff = Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT(
  924             (int64_t)zoc5 * zoz, Z_SHIFT) +
  925             zoc4) * zoz, Z_SHIFT) + zoc3) * zoz, Z_SHIFT) +
  926             zoc2) * zoz, Z_SHIFT) + zoc1) * zoz, Z_SHIFT) + zoc0;
  927 #elif defined(Z_COEFF_INTERP_OPT8X)
  928         int32_t zoz, zoe1, zoe2, zoe3, zoo1, zoo2, zoo3;
  929         int32_t zoc0, zoc1, zoc2, zoc3, zoc4, zoc5;
  930 
  931         /* 6-point, 5th-order Optimal 8x */
  932         zoz = z - (Z_ONE >> 1);
  933         zoe1 = z_coeff[1] + z_coeff[0];
  934         zoe2 = z_coeff[2] + z_coeff[-1];
  935         zoe3 = z_coeff[3] + z_coeff[-2];
  936         zoo1 = z_coeff[1] - z_coeff[0];
  937         zoo2 = z_coeff[2] - z_coeff[-1];
  938         zoo3 = z_coeff[3] - z_coeff[-2];
  939 
  940         zoc0 = Z_RSHIFT((0x1aa9b47dLL * zoe1) + (0x053d9944LL * zoe2) +
  941             (0x0018b23fLL * zoe3), 30);
  942         zoc1 = Z_RSHIFT((0x14a104d1LL * zoo1) + (0x0d7d2504LL * zoo2) +
  943             (0x0094b599LL * zoo3), 30);
  944         zoc2 = Z_RSHIFT((-0x0d22530bLL * zoe1) + (0x0bb37a2cLL * zoe2) +
  945             (0x016ed8e0LL * zoe3), 30);
  946         zoc3 = Z_RSHIFT((-0x0d744b1cLL * zoo1) + (0x01649591LL * zoo2) +
  947             (0x01dae93aLL * zoo3), 30);
  948         zoc4 = Z_RSHIFT((0x02a7ee1bLL * zoe1) + (-0x03fbdb24LL * zoe2) +
  949             (0x0153ed07LL * zoe3), 30);
  950         zoc5 = Z_RSHIFT((0x04cf9b6cLL * zoo1) + (-0x0266b378LL * zoo2) +
  951             (0x007a7c26LL * zoo3), 30);
  952 
  953         coeff = Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT(
  954             (int64_t)zoc5 * zoz, Z_SHIFT) +
  955             zoc4) * zoz, Z_SHIFT) + zoc3) * zoz, Z_SHIFT) +
  956             zoc2) * zoz, Z_SHIFT) + zoc1) * zoz, Z_SHIFT) + zoc0;
  957 #elif defined(Z_COEFF_INTERP_OPT4X)
  958         int32_t zoz, zoe1, zoe2, zoe3, zoo1, zoo2, zoo3;
  959         int32_t zoc0, zoc1, zoc2, zoc3, zoc4, zoc5;
  960 
  961         /* 6-point, 5th-order Optimal 4x */
  962         zoz = z - (Z_ONE >> 1);
  963         zoe1 = z_coeff[1] + z_coeff[0];
  964         zoe2 = z_coeff[2] + z_coeff[-1];
  965         zoe3 = z_coeff[3] + z_coeff[-2];
  966         zoo1 = z_coeff[1] - z_coeff[0];
  967         zoo2 = z_coeff[2] - z_coeff[-1];
  968         zoo3 = z_coeff[3] - z_coeff[-2];
  969 
  970         zoc0 = Z_RSHIFT((0x1a8eda43LL * zoe1) + (0x0556ee38LL * zoe2) +
  971             (0x001a3784LL * zoe3), 30);
  972         zoc1 = Z_RSHIFT((0x143d863eLL * zoo1) + (0x0d910e36LL * zoo2) +
  973             (0x009ca889LL * zoo3), 30);
  974         zoc2 = Z_RSHIFT((-0x0d026821LL * zoe1) + (0x0b837773LL * zoe2) +
  975             (0x017ef0c6LL * zoe3), 30);
  976         zoc3 = Z_RSHIFT((-0x0cef1502LL * zoo1) + (0x01207a8eLL * zoo2) +
  977             (0x01e936dbLL * zoo3), 30);
  978         zoc4 = Z_RSHIFT((0x029fe643LL * zoe1) + (-0x03ef3fc8LL * zoe2) +
  979             (0x014f5923LL * zoe3), 30);
  980         zoc5 = Z_RSHIFT((0x043a9d08LL * zoo1) + (-0x02154febLL * zoo2) +
  981             (0x00670dbdLL * zoo3), 30);
  982 
  983         coeff = Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT(
  984             (int64_t)zoc5 * zoz, Z_SHIFT) +
  985             zoc4) * zoz, Z_SHIFT) + zoc3) * zoz, Z_SHIFT) +
  986             zoc2) * zoz, Z_SHIFT) + zoc1) * zoz, Z_SHIFT) + zoc0;
  987 #elif defined(Z_COEFF_INTERP_OPT2X)
  988         int32_t zoz, zoe1, zoe2, zoe3, zoo1, zoo2, zoo3;
  989         int32_t zoc0, zoc1, zoc2, zoc3, zoc4, zoc5;
  990 
  991         /* 6-point, 5th-order Optimal 2x */
  992         zoz = z - (Z_ONE >> 1);
  993         zoe1 = z_coeff[1] + z_coeff[0];
  994         zoe2 = z_coeff[2] + z_coeff[-1];
  995         zoe3 = z_coeff[3] + z_coeff[-2];
  996         zoo1 = z_coeff[1] - z_coeff[0];
  997         zoo2 = z_coeff[2] - z_coeff[-1];
  998         zoo3 = z_coeff[3] - z_coeff[-2];
  999 
 1000         zoc0 = Z_RSHIFT((0x19edb6fdLL * zoe1) + (0x05ebd062LL * zoe2) +
 1001             (0x00267881LL * zoe3), 30);
 1002         zoc1 = Z_RSHIFT((0x1223af76LL * zoo1) + (0x0de3dd6bLL * zoo2) +
 1003             (0x00d683cdLL * zoo3), 30);
 1004         zoc2 = Z_RSHIFT((-0x0c3ee068LL * zoe1) + (0x0a5c3769LL * zoe2) +
 1005             (0x01e2aceaLL * zoe3), 30);
 1006         zoc3 = Z_RSHIFT((-0x0a8ab614LL * zoo1) + (-0x0019522eLL * zoo2) +
 1007             (0x022cefc7LL * zoo3), 30);
 1008         zoc4 = Z_RSHIFT((0x0276187dLL * zoe1) + (-0x03a801e8LL * zoe2) +
 1009             (0x0131d935LL * zoe3), 30);
 1010         zoc5 = Z_RSHIFT((0x02c373f5LL * zoo1) + (-0x01275f83LL * zoo2) +
 1011             (0x0018ee79LL * zoo3), 30);
 1012 
 1013         coeff = Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT((Z_RSHIFT(
 1014             (int64_t)zoc5 * zoz, Z_SHIFT) +
 1015             zoc4) * zoz, Z_SHIFT) + zoc3) * zoz, Z_SHIFT) +
 1016             zoc2) * zoz, Z_SHIFT) + zoc1) * zoz, Z_SHIFT) + zoc0;
 1017 #else
 1018 #error "Interpolation type screwed!"
 1019 #endif
 1020 
 1021 #if Z_POLYPHASE_COEFF_SHIFT > 0
 1022         coeff = Z_RSHIFT(coeff, Z_POLYPHASE_COEFF_SHIFT);
 1023 #endif
 1024         return (coeff);
 1025 }
 1026 
 1027 static int
 1028 z_resampler_build_polyphase(struct z_info *info)
 1029 {
 1030         int32_t alpha, c, i, z, idx;
 1031 
 1032         /* Let this be here first. */
 1033         if (info->z_pcoeff != NULL) {
 1034                 free(info->z_pcoeff, M_DEVBUF);
 1035                 info->z_pcoeff = NULL;
 1036         }
 1037 
 1038         if (feeder_rate_polyphase_max < 1)
 1039                 return (ENOTSUP);
 1040 
 1041         if (((int64_t)info->z_size * info->z_gy * 2) >
 1042             feeder_rate_polyphase_max) {
 1043 #ifndef _KERNEL
 1044                 fprintf(stderr, "Polyphase entries exceed: [%d/%d] %jd > %d\n",
 1045                     info->z_gx, info->z_gy,
 1046                     (intmax_t)info->z_size * info->z_gy * 2,
 1047                     feeder_rate_polyphase_max);
 1048 #endif
 1049                 return (E2BIG);
 1050         }
 1051 
 1052         info->z_pcoeff = malloc(sizeof(int32_t) *
 1053             info->z_size * info->z_gy * 2, M_DEVBUF, M_NOWAIT | M_ZERO);
 1054         if (info->z_pcoeff == NULL)
 1055                 return (ENOMEM);
 1056 
 1057         for (alpha = 0; alpha < info->z_gy; alpha++) {
 1058                 z = alpha * info->z_dx;
 1059                 c = 0;
 1060                 for (i = info->z_size; i != 0; i--) {
 1061                         c += z >> Z_SHIFT;
 1062                         z &= Z_MASK;
 1063                         idx = (alpha * info->z_size * 2) +
 1064                             (info->z_size * 2) - i;
 1065                         info->z_pcoeff[idx] =
 1066                             z_coeff_interpolate(z, info->z_coeff + c);
 1067                         z += info->z_dy;
 1068                 }
 1069                 z = info->z_dy - (alpha * info->z_dx);
 1070                 c = 0;
 1071                 for (i = info->z_size; i != 0; i--) {
 1072                         c += z >> Z_SHIFT;
 1073                         z &= Z_MASK;
 1074                         idx = (alpha * info->z_size * 2) + i - 1;
 1075                         info->z_pcoeff[idx] =
 1076                             z_coeff_interpolate(z, info->z_coeff + c);
 1077                         z += info->z_dy;
 1078                 }
 1079         }
 1080         
 1081 #ifndef _KERNEL
 1082         fprintf(stderr, "Polyphase: [%d/%d] %d entries\n",
 1083             info->z_gx, info->z_gy, info->z_size * info->z_gy * 2);
 1084 #endif
 1085 
 1086         return (0);
 1087 }
 1088 
 1089 static int
 1090 z_resampler_setup(struct pcm_feeder *f)
 1091 {
 1092         struct z_info *info;
 1093         int64_t gy2gx_max, gx2gy_max;
 1094         uint32_t format;
 1095         int32_t align, i, z_scale;
 1096         int adaptive;
 1097 
 1098         info = f->data;
 1099         z_resampler_reset(info);
 1100 
 1101         if (info->src == info->dst)
 1102                 return (0);
 1103 
 1104         /* Shrink by greatest common divisor. */
 1105         i = z_gcd(info->src, info->dst);
 1106         info->z_gx = info->src / i;
 1107         info->z_gy = info->dst / i;
 1108 
 1109         /* Too big, or too small. Bail out. */
 1110         if (!(Z_FACTOR_SAFE(info->z_gx) && Z_FACTOR_SAFE(info->z_gy)))
 1111                 return (EINVAL);
 1112 
 1113         format = f->desc->in;
 1114         adaptive = 0;
 1115         z_scale = 0;
 1116 
 1117         /*
 1118          * Setup everything: filter length, conversion factor, etc.
 1119          */
 1120         if (Z_IS_SINC(info)) {
 1121                 /*
 1122                  * Downsampling, or upsampling scaling factor. As long as the
 1123                  * factor can be represented by a fraction of 1 << Z_SHIFT,
 1124                  * we're pretty much in business. Scaling is not needed for
 1125                  * upsampling, so we just slap Z_ONE there.
 1126                  */
 1127                 if (info->z_gx > info->z_gy)
 1128                         /*
 1129                          * If the downsampling ratio is beyond sanity,
 1130                          * enable semi-adaptive mode. Although handling
 1131                          * extreme ratio is possible, the result of the
 1132                          * conversion is just pointless, unworthy,
 1133                          * nonsensical noises, etc.
 1134                          */
 1135                         if ((info->z_gx / info->z_gy) > Z_SINC_DOWNMAX)
 1136                                 z_scale = Z_ONE / Z_SINC_DOWNMAX;
 1137                         else
 1138                                 z_scale = ((uint64_t)info->z_gy << Z_SHIFT) /
 1139                                     info->z_gx;
 1140                 else
 1141                         z_scale = Z_ONE;
 1142 
 1143                 /*
 1144                  * This is actually impossible, unless anything above
 1145                  * overflow.
 1146                  */
 1147                 if (z_scale < 1)
 1148                         return (E2BIG);
 1149 
 1150                 /*
 1151                  * Calculate sample time/coefficients index drift. It is
 1152                  * a constant for upsampling, but downsampling require
 1153                  * heavy duty filtering with possible too long filters.
 1154                  * If anything goes wrong, revisit again and enable
 1155                  * adaptive mode.
 1156                  */
 1157 z_setup_adaptive_sinc:
 1158                 if (info->z_pcoeff != NULL) {
 1159                         free(info->z_pcoeff, M_DEVBUF);
 1160                         info->z_pcoeff = NULL;
 1161                 }
 1162 
 1163                 if (adaptive == 0) {
 1164                         info->z_dy = z_scale << Z_DRIFT_SHIFT;
 1165                         if (info->z_dy < 1)
 1166                                 return (E2BIG);
 1167                         info->z_scale = z_scale;
 1168                 } else {
 1169                         info->z_dy = Z_FULL_ONE;
 1170                         info->z_scale = Z_ONE;
 1171                 }
 1172 
 1173 #if 0
 1174 #define Z_SCALE_DIV     10000
 1175 #define Z_SCALE_LIMIT(s, v)                                             \
 1176         ((((uint64_t)(s) * (v)) + (Z_SCALE_DIV >> 1)) / Z_SCALE_DIV)
 1177 
 1178                 info->z_scale = Z_SCALE_LIMIT(info->z_scale, 9780);
 1179 #endif
 1180 
 1181                 /* Smallest drift increment. */
 1182                 info->z_dx = info->z_dy / info->z_gy;
 1183 
 1184                 /*
 1185                  * Overflow or underflow. Try adaptive, let it continue and
 1186                  * retry.
 1187                  */
 1188                 if (info->z_dx < 1) {
 1189                         if (adaptive == 0) {
 1190                                 adaptive = 1;
 1191                                 goto z_setup_adaptive_sinc;
 1192                         }
 1193                         return (E2BIG);
 1194                 }
 1195 
 1196                 /*
 1197                  * Round back output drift.
 1198                  */
 1199                 info->z_dy = info->z_dx * info->z_gy;
 1200 
 1201                 for (i = 0; i < Z_COEFF_TAB_SIZE; i++) {
 1202                         if (Z_SINC_COEFF_IDX(info) != i)
 1203                                 continue;
 1204                         /*
 1205                          * Calculate required filter length and guard
 1206                          * against possible abusive result. Note that
 1207                          * this represents only 1/2 of the entire filter
 1208                          * length.
 1209                          */
 1210                         info->z_size = z_resampler_sinc_len(info);
 1211 
 1212                         /*
 1213                          * Multiple of 2 rounding, for better accumulator
 1214                          * performance.
 1215                          */
 1216                         info->z_size &= ~1;
 1217 
 1218                         if (info->z_size < 2 || info->z_size > Z_SINC_MAX) {
 1219                                 if (adaptive == 0) {
 1220                                         adaptive = 1;
 1221                                         goto z_setup_adaptive_sinc;
 1222                                 }
 1223                                 return (E2BIG);
 1224                         }
 1225                         info->z_coeff = z_coeff_tab[i].coeff + Z_COEFF_OFFSET;
 1226                         info->z_dcoeff = z_coeff_tab[i].dcoeff;
 1227                         break;
 1228                 }
 1229 
 1230                 if (info->z_coeff == NULL || info->z_dcoeff == NULL)
 1231                         return (EINVAL);
 1232         } else if (Z_IS_LINEAR(info)) {
 1233                 /*
 1234                  * Don't put much effort if we're doing linear interpolation.
 1235                  * Just center the interpolation distance within Z_LINEAR_ONE,
 1236                  * and be happy about it.
 1237                  */
 1238                 info->z_dx = Z_LINEAR_FULL_ONE / info->z_gy;
 1239         }
 1240 
 1241         /*
 1242          * We're safe for now, lets continue.. Look for our resampler
 1243          * depending on configured format and quality.
 1244          */
 1245         for (i = 0; i < Z_RESAMPLER_TAB_SIZE; i++) {
 1246                 int ridx;
 1247 
 1248                 if (AFMT_ENCODING(format) != z_resampler_tab[i].format)
 1249                         continue;
 1250                 if (Z_IS_SINC(info) && adaptive == 0 &&
 1251                     z_resampler_build_polyphase(info) == 0)
 1252                         ridx = Z_RESAMPLER_SINC_POLYPHASE;
 1253                 else
 1254                         ridx = Z_RESAMPLER_IDX(info);
 1255                 info->z_resample = z_resampler_tab[i].resampler[ridx];
 1256                 break;
 1257         }
 1258 
 1259         if (info->z_resample == NULL)
 1260                 return (EINVAL);
 1261 
 1262         info->bps = AFMT_BPS(format);
 1263         align = info->channels * info->bps;
 1264 
 1265         /*
 1266          * Calculate largest value that can be fed into z_gy2gx() and
 1267          * z_gx2gy() without causing (signed) 32bit overflow. z_gy2gx() will
 1268          * be called early during feeding process to determine how much input
 1269          * samples that is required to generate requested output, while
 1270          * z_gx2gy() will be called just before samples filtering /
 1271          * accumulation process based on available samples that has been
 1272          * calculated using z_gx2gy().
 1273          *
 1274          * Now that is damn confusing, I guess ;-) .
 1275          */
 1276         gy2gx_max = (((uint64_t)info->z_gy * INT32_MAX) - info->z_gy + 1) /
 1277             info->z_gx;
 1278 
 1279         if ((gy2gx_max * align) > SND_FXDIV_MAX)
 1280                 gy2gx_max = SND_FXDIV_MAX / align;
 1281 
 1282         if (gy2gx_max < 1)
 1283                 return (E2BIG);
 1284 
 1285         gx2gy_max = (((uint64_t)info->z_gx * INT32_MAX) - info->z_gy) /
 1286             info->z_gy;
 1287 
 1288         if (gx2gy_max > INT32_MAX)
 1289                 gx2gy_max = INT32_MAX;
 1290 
 1291         if (gx2gy_max < 1)
 1292                 return (E2BIG);
 1293 
 1294         /*
 1295          * Ensure that z_gy2gx() at its largest possible calculated value
 1296          * (alpha = 0) will not cause overflow further late during z_gx2gy()
 1297          * stage.
 1298          */
 1299         if (z_gy2gx(info, gy2gx_max) > _Z_GCAST(gx2gy_max))
 1300                 return (E2BIG);
 1301 
 1302         info->z_maxfeed = gy2gx_max * align;
 1303 
 1304 #ifdef Z_USE_ALPHADRIFT
 1305         info->z_startdrift = z_gy2gx(info, 1);
 1306         info->z_alphadrift = z_drift(info, info->z_startdrift, 1);
 1307 #endif
 1308 
 1309         i = z_gy2gx(info, 1);
 1310         info->z_full = z_roundpow2((info->z_size << 1) + i);
 1311 
 1312         /*
 1313          * Too big to be true, and overflowing left and right like mad ..
 1314          */
 1315         if ((info->z_full * align) < 1) {
 1316                 if (adaptive == 0 && Z_IS_SINC(info)) {
 1317                         adaptive = 1;
 1318                         goto z_setup_adaptive_sinc;
 1319                 }
 1320                 return (E2BIG);
 1321         }
 1322 
 1323         /*
 1324          * Increase full buffer size if its too small to reduce cyclic
 1325          * buffer shifting in main conversion/feeder loop.
 1326          */
 1327         while (info->z_full < Z_RESERVOIR_MAX &&
 1328             (info->z_full - (info->z_size << 1)) < Z_RESERVOIR)
 1329                 info->z_full <<= 1;
 1330 
 1331         /* Initialize buffer position. */
 1332         info->z_mask = info->z_full - 1;
 1333         info->z_start = z_prev(info, info->z_size << 1, 1);
 1334         info->z_pos = z_next(info, info->z_start, 1);
 1335 
 1336         /*
 1337          * Allocate or reuse delay line buffer, whichever makes sense.
 1338          */
 1339         i = info->z_full * align;
 1340         if (i < 1)
 1341                 return (E2BIG);
 1342 
 1343         if (info->z_delay == NULL || info->z_alloc < i ||
 1344             i <= (info->z_alloc >> 1)) {
 1345                 if (info->z_delay != NULL)
 1346                         free(info->z_delay, M_DEVBUF);
 1347                 info->z_delay = malloc(i, M_DEVBUF, M_NOWAIT | M_ZERO);
 1348                 if (info->z_delay == NULL)
 1349                         return (ENOMEM);
 1350                 info->z_alloc = i;
 1351         }
 1352 
 1353         /*
 1354          * Zero out head of buffer to avoid pops and clicks.
 1355          */
 1356         memset(info->z_delay, sndbuf_zerodata(f->desc->out),
 1357             info->z_pos * align);
 1358 
 1359 #ifdef Z_DIAGNOSTIC
 1360         /*
 1361          * XXX Debuging mess !@#$%^
 1362          */
 1363 #define dumpz(x)        fprintf(stderr, "\t%12s = %10u : %-11d\n",      \
 1364                             "z_"__STRING(x), (uint32_t)info->z_##x,     \
 1365                             (int32_t)info->z_##x)
 1366         fprintf(stderr, "\n%s():\n", __func__);
 1367         fprintf(stderr, "\tchannels=%d, bps=%d, format=0x%08x, quality=%d\n",
 1368             info->channels, info->bps, format, info->quality);
 1369         fprintf(stderr, "\t%d (%d) -> %d (%d), ",
 1370             info->src, info->rsrc, info->dst, info->rdst);
 1371         fprintf(stderr, "[%d/%d]\n", info->z_gx, info->z_gy);
 1372         fprintf(stderr, "\tminreq=%d, ", z_gy2gx(info, 1));
 1373         if (adaptive != 0)
 1374                 z_scale = Z_ONE;
 1375         fprintf(stderr, "factor=0x%08x/0x%08x (%f)\n",
 1376             z_scale, Z_ONE, (double)z_scale / Z_ONE);
 1377         fprintf(stderr, "\tbase_length=%d, ", Z_SINC_BASE_LEN(info));
 1378         fprintf(stderr, "adaptive=%s\n", (adaptive != 0) ? "YES" : "NO");
 1379         dumpz(size);
 1380         dumpz(alloc);
 1381         if (info->z_alloc < 1024)
 1382                 fprintf(stderr, "\t%15s%10d Bytes\n",
 1383                     "", info->z_alloc);
 1384         else if (info->z_alloc < (1024 << 10))
 1385                 fprintf(stderr, "\t%15s%10d KBytes\n",
 1386                     "", info->z_alloc >> 10);
 1387         else if (info->z_alloc < (1024 << 20))
 1388                 fprintf(stderr, "\t%15s%10d MBytes\n",
 1389                     "", info->z_alloc >> 20);
 1390         else
 1391                 fprintf(stderr, "\t%15s%10d GBytes\n",
 1392                     "", info->z_alloc >> 30);
 1393         fprintf(stderr, "\t%12s   %10d (min output samples)\n",
 1394             "",
 1395             (int32_t)z_gx2gy(info, info->z_full - (info->z_size << 1)));
 1396         fprintf(stderr, "\t%12s   %10d (min allocated output samples)\n",
 1397             "",
 1398             (int32_t)z_gx2gy(info, (info->z_alloc / align) -
 1399             (info->z_size << 1)));
 1400         fprintf(stderr, "\t%12s = %10d\n",
 1401             "z_gy2gx()", (int32_t)z_gy2gx(info, 1));
 1402         fprintf(stderr, "\t%12s = %10d -> z_gy2gx() -> %d\n",
 1403             "Max", (int32_t)gy2gx_max, (int32_t)z_gy2gx(info, gy2gx_max));
 1404         fprintf(stderr, "\t%12s = %10d\n",
 1405             "z_gx2gy()", (int32_t)z_gx2gy(info, 1));
 1406         fprintf(stderr, "\t%12s = %10d -> z_gx2gy() -> %d\n",
 1407             "Max", (int32_t)gx2gy_max, (int32_t)z_gx2gy(info, gx2gy_max));
 1408         dumpz(maxfeed);
 1409         dumpz(full);
 1410         dumpz(start);
 1411         dumpz(pos);
 1412         dumpz(scale);
 1413         fprintf(stderr, "\t%12s   %10f\n", "",
 1414             (double)info->z_scale / Z_ONE);
 1415         dumpz(dx);
 1416         fprintf(stderr, "\t%12s   %10f\n", "",
 1417             (double)info->z_dx / info->z_dy);
 1418         dumpz(dy);
 1419         fprintf(stderr, "\t%12s   %10d (drift step)\n", "",
 1420             info->z_dy >> Z_SHIFT);
 1421         fprintf(stderr, "\t%12s   %10d (scaling differences)\n", "",
 1422             (z_scale << Z_DRIFT_SHIFT) - info->z_dy);
 1423         fprintf(stderr, "\t%12s = %u bytes\n",
 1424             "intpcm32_t", sizeof(intpcm32_t));
 1425         fprintf(stderr, "\t%12s = 0x%08x, smallest=%.16lf\n",
 1426             "Z_ONE", Z_ONE, (double)1.0 / (double)Z_ONE);
 1427 #endif
 1428 
 1429         return (0);
 1430 }
 1431 
 1432 static int
 1433 z_resampler_set(struct pcm_feeder *f, int what, int32_t value)
 1434 {
 1435         struct z_info *info;
 1436         int32_t oquality;
 1437 
 1438         info = f->data;
 1439 
 1440         switch (what) {
 1441         case Z_RATE_SRC:
 1442                 if (value < feeder_rate_min || value > feeder_rate_max)
 1443                         return (E2BIG);
 1444                 if (value == info->rsrc)
 1445                         return (0);
 1446                 info->rsrc = value;
 1447                 break;
 1448         case Z_RATE_DST:
 1449                 if (value < feeder_rate_min || value > feeder_rate_max)
 1450                         return (E2BIG);
 1451                 if (value == info->rdst)
 1452                         return (0);
 1453                 info->rdst = value;
 1454                 break;
 1455         case Z_RATE_QUALITY:
 1456                 if (value < Z_QUALITY_MIN || value > Z_QUALITY_MAX)
 1457                         return (EINVAL);
 1458                 if (value == info->quality)
 1459                         return (0);
 1460                 /*
 1461                  * If we failed to set the requested quality, restore
 1462                  * the old one. We cannot afford leaving it broken since
 1463                  * passive feeder chains like vchans never reinitialize
 1464                  * itself.
 1465                  */
 1466                 oquality = info->quality;
 1467                 info->quality = value;
 1468                 if (z_resampler_setup(f) == 0)
 1469                         return (0);
 1470                 info->quality = oquality;
 1471                 break;
 1472         case Z_RATE_CHANNELS:
 1473                 if (value < SND_CHN_MIN || value > SND_CHN_MAX)
 1474                         return (EINVAL);
 1475                 if (value == info->channels)
 1476                         return (0);
 1477                 info->channels = value;
 1478                 break;
 1479         default:
 1480                 return (EINVAL);
 1481                 break;
 1482         }
 1483 
 1484         return (z_resampler_setup(f));
 1485 }
 1486 
 1487 static int
 1488 z_resampler_get(struct pcm_feeder *f, int what)
 1489 {
 1490         struct z_info *info;
 1491 
 1492         info = f->data;
 1493 
 1494         switch (what) {
 1495         case Z_RATE_SRC:
 1496                 return (info->rsrc);
 1497                 break;
 1498         case Z_RATE_DST:
 1499                 return (info->rdst);
 1500                 break;
 1501         case Z_RATE_QUALITY:
 1502                 return (info->quality);
 1503                 break;
 1504         case Z_RATE_CHANNELS:
 1505                 return (info->channels);
 1506                 break;
 1507         default:
 1508                 break;
 1509         }
 1510 
 1511         return (-1);
 1512 }
 1513 
 1514 static int
 1515 z_resampler_init(struct pcm_feeder *f)
 1516 {
 1517         struct z_info *info;
 1518         int ret;
 1519 
 1520         if (f->desc->in != f->desc->out)
 1521                 return (EINVAL);
 1522 
 1523         info = malloc(sizeof(*info), M_DEVBUF, M_NOWAIT | M_ZERO);
 1524         if (info == NULL)
 1525                 return (ENOMEM);
 1526 
 1527         info->rsrc = Z_RATE_DEFAULT;
 1528         info->rdst = Z_RATE_DEFAULT;
 1529         info->quality = feeder_rate_quality;
 1530         info->channels = AFMT_CHANNEL(f->desc->in);
 1531 
 1532         f->data = info;
 1533 
 1534         ret = z_resampler_setup(f);
 1535         if (ret != 0) {
 1536                 if (info->z_pcoeff != NULL)
 1537                         free(info->z_pcoeff, M_DEVBUF);
 1538                 if (info->z_delay != NULL)
 1539                         free(info->z_delay, M_DEVBUF);
 1540                 free(info, M_DEVBUF);
 1541                 f->data = NULL;
 1542         }
 1543 
 1544         return (ret);
 1545 }
 1546 
 1547 static int
 1548 z_resampler_free(struct pcm_feeder *f)
 1549 {
 1550         struct z_info *info;
 1551 
 1552         info = f->data;
 1553         if (info != NULL) {
 1554                 if (info->z_pcoeff != NULL)
 1555                         free(info->z_pcoeff, M_DEVBUF);
 1556                 if (info->z_delay != NULL)
 1557                         free(info->z_delay, M_DEVBUF);
 1558                 free(info, M_DEVBUF);
 1559         }
 1560 
 1561         f->data = NULL;
 1562 
 1563         return (0);
 1564 }
 1565 
 1566 static uint32_t
 1567 z_resampler_feed_internal(struct pcm_feeder *f, struct pcm_channel *c,
 1568     uint8_t *b, uint32_t count, void *source)
 1569 {
 1570         struct z_info *info;
 1571         int32_t alphadrift, startdrift, reqout, ocount, reqin, align;
 1572         int32_t fetch, fetched, start, cp;
 1573         uint8_t *dst;
 1574 
 1575         info = f->data;
 1576         if (info->z_resample == NULL)
 1577                 return (z_feed(f->source, c, b, count, source));
 1578 
 1579         /*
 1580          * Calculate sample size alignment and amount of sample output.
 1581          * We will do everything in sample domain, but at the end we
 1582          * will jump back to byte domain.
 1583          */
 1584         align = info->channels * info->bps;
 1585         ocount = SND_FXDIV(count, align);
 1586         if (ocount == 0)
 1587                 return (0);
 1588 
 1589         /*
 1590          * Calculate amount of input samples that is needed to generate
 1591          * exact amount of output.
 1592          */
 1593         reqin = z_gy2gx(info, ocount) - z_fetched(info);
 1594 
 1595 #ifdef Z_USE_ALPHADRIFT
 1596         startdrift = info->z_startdrift;
 1597         alphadrift = info->z_alphadrift;
 1598 #else
 1599         startdrift = _Z_GY2GX(info, 0, 1);
 1600         alphadrift = z_drift(info, startdrift, 1);
 1601 #endif
 1602 
 1603         dst = b;
 1604 
 1605         do {
 1606                 if (reqin != 0) {
 1607                         fetch = z_min(z_free(info), reqin);
 1608                         if (fetch == 0) {
 1609                                 /*
 1610                                  * No more free spaces, so wind enough
 1611                                  * samples back to the head of delay line
 1612                                  * in byte domain.
 1613                                  */
 1614                                 fetched = z_fetched(info);
 1615                                 start = z_prev(info, info->z_start,
 1616                                     (info->z_size << 1) - 1);
 1617                                 cp = (info->z_size << 1) + fetched;
 1618                                 z_copy(info->z_delay + (start * align),
 1619                                     info->z_delay, cp * align);
 1620                                 info->z_start =
 1621                                     z_prev(info, info->z_size << 1, 1);
 1622                                 info->z_pos =
 1623                                     z_next(info, info->z_start, fetched + 1);
 1624                                 fetch = z_min(z_free(info), reqin);
 1625 #ifdef Z_DIAGNOSTIC
 1626                                 if (1) {
 1627                                         static uint32_t kk = 0;
 1628                                         fprintf(stderr,
 1629                                             "Buffer Move: "
 1630                                             "start=%d fetched=%d cp=%d "
 1631                                             "cycle=%u [%u]\r",
 1632                                             start, fetched, cp, info->z_cycle,
 1633                                             ++kk);
 1634                                 }
 1635                                 info->z_cycle = 0;
 1636 #endif
 1637                         }
 1638                         if (fetch != 0) {
 1639                                 /*
 1640                                  * Fetch in byte domain and jump back
 1641                                  * to sample domain.
 1642                                  */
 1643                                 fetched = SND_FXDIV(z_feed(f->source, c,
 1644                                     info->z_delay + (info->z_pos * align),
 1645                                     fetch * align, source), align);
 1646                                 /*
 1647                                  * Prepare to convert fetched buffer,
 1648                                  * or mark us done if we cannot fulfill
 1649                                  * the request.
 1650                                  */
 1651                                 reqin -= fetched;
 1652                                 info->z_pos += fetched;
 1653                                 if (fetched != fetch)
 1654                                         reqin = 0;
 1655                         }
 1656                 }
 1657 
 1658                 reqout = z_min(z_gx2gy(info, z_fetched(info)), ocount);
 1659                 if (reqout != 0) {
 1660                         ocount -= reqout;
 1661 
 1662                         /*
 1663                          * Drift.. drift.. drift..
 1664                          *
 1665                          * Notice that there are 2 methods of doing the drift
 1666                          * operations: The former is much cleaner (in a sense
 1667                          * of mathematical readings of my eyes), but slower
 1668                          * due to integer division in z_gy2gx(). Nevertheless,
 1669                          * both should give the same exact accurate drifting
 1670                          * results, so the later is favourable.
 1671                          */
 1672                         do {
 1673                                 info->z_resample(info, dst);
 1674 #if 0
 1675                                 startdrift = z_gy2gx(info, 1);
 1676                                 alphadrift = z_drift(info, startdrift, 1);
 1677                                 info->z_start += startdrift;
 1678                                 info->z_alpha += alphadrift;
 1679 #else
 1680                                 info->z_alpha += alphadrift;
 1681                                 if (info->z_alpha < info->z_gy)
 1682                                         info->z_start += startdrift;
 1683                                 else {
 1684                                         info->z_start += startdrift - 1;
 1685                                         info->z_alpha -= info->z_gy;
 1686                                 }
 1687 #endif
 1688                                 dst += align;
 1689 #ifdef Z_DIAGNOSTIC
 1690                                 info->z_cycle++;
 1691 #endif
 1692                         } while (--reqout != 0);
 1693                 }
 1694         } while (reqin != 0 && ocount != 0);
 1695 
 1696         /*
 1697          * Back to byte domain..
 1698          */
 1699         return (dst - b);
 1700 }
 1701 
 1702 static int
 1703 z_resampler_feed(struct pcm_feeder *f, struct pcm_channel *c, uint8_t *b,
 1704     uint32_t count, void *source)
 1705 {
 1706         uint32_t feed, maxfeed, left;
 1707 
 1708         /*
 1709          * Split count to smaller chunks to avoid possible 32bit overflow.
 1710          */
 1711         maxfeed = ((struct z_info *)(f->data))->z_maxfeed;
 1712         left = count;
 1713 
 1714         do {
 1715                 feed = z_resampler_feed_internal(f, c, b,
 1716                     z_min(maxfeed, left), source);
 1717                 b += feed;
 1718                 left -= feed;
 1719         } while (left != 0 && feed != 0);
 1720 
 1721         return (count - left);
 1722 }
 1723 
 1724 static struct pcm_feederdesc feeder_rate_desc[] = {
 1725         { FEEDER_RATE, 0, 0, 0, 0 },
 1726         { 0, 0, 0, 0, 0 },
 1727 };
 1728 
 1729 static kobj_method_t feeder_rate_methods[] = {
 1730         KOBJMETHOD(feeder_init,         z_resampler_init),
 1731         KOBJMETHOD(feeder_free,         z_resampler_free),
 1732         KOBJMETHOD(feeder_set,          z_resampler_set),
 1733         KOBJMETHOD(feeder_get,          z_resampler_get),
 1734         KOBJMETHOD(feeder_feed,         z_resampler_feed),
 1735         KOBJMETHOD_END
 1736 };
 1737 
 1738 FEEDER_DECLARE(feeder_rate, NULL);

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