3 # Copyright (c) 2007-2009 Ariff Abdullah <ariff@FreeBSD.org>
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions
9 # 1. Redistributions of source code must retain the above copyright
10 # notice, this list of conditions and the following disclaimer.
11 # 2. Redistributions in binary form must reproduce the above copyright
12 # notice, this list of conditions and the following disclaimer in the
13 # documentation and/or other materials provided with the distribution.
15 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 # FIR filter design by windowing method. This might become one of the
32 # funniest joke I've ever written due to too many tricks being applied to
33 # ensure maximum precision (well, in fact this is already have the same
34 # precision granularity compared to its C counterpart). Nevertheless, it's
35 # working, precise, dynamically tunable based on "presets".
37 # XXX EXPECT TOTAL REWRITE! DON'T ARGUE!
39 # TODO: Using ultraspherical window might be a good idea.
43 # "Digital Audio Resampling" by Julius O. Smith III
45 # - http://ccrma.stanford.edu/~jos/resample/
49 # Some basic Math functions.
53 return (((x < 0) ? -x : x) + 0);
58 return (((x < 0.0) ? -x : x) + 0.0);
79 return (exp(1.0 * y * log(1.0 * x)));
96 while (y > 0 && x != 0) {
103 function fx_floor(v, o, r)
105 if (fabs(v) < fabs(smallest))
107 if (fabs(v) > fabs(largest))
110 r = floor((v * o) + 0.5);
111 if (r < INT32_MIN || r > INT32_MAX)
112 printf("\n#error overflow v=%f, please reduce %d\n", v, o);
118 # Kaiser linear piecewise functions.
120 function kaiserAttn2Beta(attn, beta)
123 return (Z_KAISER_BETA_DEFAULT);
126 beta = 0.1102 * ((1.0 * attn) - 8.7);
127 else if (attn > 21.0)
128 beta = (0.5842 * pow((1.0 * attn) - 21.0, 0.4)) + \
129 (0.07886 * ((1.0 * attn) - 21.0));
136 function kaiserBeta2Attn(beta, x, y, i, attn, xbeta)
138 if (beta < Z_WINDOW_KAISER)
139 return (Z_KAISER_ATTN_DEFAULT);
141 if (beta > kaiserAttn2Beta(50.0))
142 attn = ((1.0 * beta) / 0.1102) + 8.7;
146 attn = 0.5 * (x + y);
147 for (i = 0; i < 128; i++) {
148 xbeta = kaiserAttn2Beta(attn)
149 if (beta == xbeta || \
151 fabs(beta - xbeta) < Z_KAISER_EPSILON))
157 attn = 0.5 * (x + y);
164 function kaiserRolloff(len, attn)
166 return (1.0 - (((1.0 * attn) - 7.95) / (((1.0 * len) - 1.0) * 14.36)));
170 # 0th order modified Bessel function of the first kind.
172 function I0(x, s, u, n, h, t)
183 } while (u >= (I0_EPSILON * s));
190 if (beta >= Z_WINDOW_KAISER)
192 else if (beta == Z_WINDOW_BLACKMAN_NUTTALL)
193 return ("Blackman - Nuttall");
194 else if (beta == Z_WINDOW_NUTTALL)
196 else if (beta == Z_WINDOW_BLACKMAN_HARRIS)
197 return ("Blackman - Harris");
198 else if (beta == Z_WINDOW_BLACKMAN)
200 else if (beta == Z_WINDOW_HAMMING)
202 else if (beta == Z_WINDOW_HANN)
205 return ("What The Hell !?!?");
208 function rolloff_round(x)
218 function tap_round(x, y)
225 function lpf(imp, n, rolloff, beta, num, i, j, x, nm, ibeta, w)
227 rolloff = rolloff_round(rolloff + (Z_NYQUIST_HOVER * (1.0 - rolloff)));
231 # Generate ideal sinc impulses, locate the last zero-crossing and pad
232 # the remaining with 0.
234 # Note that there are other (faster) ways of calculating this without
235 # the misery of traversing the entire sinc given the fact that the
236 # distance between each zero crossings is actually the bandwidth of
237 # the impulses, but it seems having 0.0001% chances of failure due to
241 for (i = 1; i < n; i++) {
242 x = (M_PI * i) / (1.0 * num);
243 imp[i] = sin(x * rolloff) / x;
244 if (i != 1 && (imp[i] * imp[i - 1]) <= 0.0)
248 for (i = j; i < n; i++)
253 if (beta >= Z_WINDOW_KAISER)
256 for (i = 1; i < j; i++) {
257 if (beta >= Z_WINDOW_KAISER) {
260 w = I0(beta * sqrt(1.0 - (x * x))) / ibeta;
264 if (beta == Z_WINDOW_BLACKMAN_NUTTALL) {
266 w = 0.36335819 + (0.4891775 * cos(x)) + \
267 (0.1365995 * cos(2 * x)) + \
268 (0.0106411 * cos(3 * x));
269 } else if (beta == Z_WINDOW_NUTTALL) {
271 w = 0.355768 + (0.487396 * cos(x)) + \
272 (0.144232 * cos(2 * x)) + \
273 (0.012604 * cos(3 * x));
274 } else if (beta == Z_WINDOW_BLACKMAN_HARRIS) {
276 w = 0.422323 + (0.49755 * cos(x)) + \
277 (0.07922 * cos(2 * x));
278 } else if (beta == Z_WINDOW_BLACKMAN) {
280 w = 0.42 + (0.50 * cos(x)) + \
282 } else if (beta == Z_WINDOW_HAMMING) {
284 w = 0.54 + (0.46 * cos(x));
285 } else if (beta == Z_WINDOW_HANN) {
287 w = 0.50 + (0.50 * cos(x));
296 imp["impulse_length"] = j;
297 imp["rolloff"] = rolloff;
300 function mkfilter(imp, nmult, rolloff, beta, num, \
301 nwing, mwing, nrolloff, i, dcgain, v, quality)
303 nwing = floor((nmult * num) / 2) + 1;
305 lpf(imp, nwing, rolloff, beta, num);
307 mwing = imp["impulse_length"];
308 nrolloff = imp["rolloff"];
309 quality = imp["quality"];
312 for (i = num; i < mwing; i += num)
317 for (i = 0; i < nwing; i++)
323 printf(" * quality = %d\n", quality);
324 printf(" * window = %s\n", wname(beta));
325 if (beta >= Z_WINDOW_KAISER) {
326 printf(" * beta: %.2f\n", beta);
327 printf(" * stop: -%.2f dB\n", \
328 kaiserBeta2Attn(beta));
330 printf(" * length = %d\n", nmult);
331 printf(" * bandwidth = %.2f%%", rolloff * 100.0);
332 if (rolloff != nrolloff) {
333 printf(" + %.2f%% = %.2f%% (nyquist hover: %.2f%%)", \
334 (nrolloff - rolloff) * 100.0, nrolloff * 100.0, \
335 Z_NYQUIST_HOVER * 100.0);
338 printf(" * drift = %d\n", num);
339 printf(" * width = %d\n", mwing);
341 printf("static int32_t z_coeff_q%d[%d] = {", \
342 quality, nwing + (Z_COEFF_OFFSET * 2));
343 for (i = 0; i < (nwing + (Z_COEFF_OFFSET * 2)); i++) {
346 if (i < Z_COEFF_OFFSET)
347 v = fx_floor(imp[Z_COEFF_OFFSET - i], Z_COEFF_ONE);
348 else if ((i - Z_COEFF_OFFSET) >= nwing)
350 imp[nwing + nwing - i + Z_COEFF_OFFSET - 1],\
353 v = fx_floor(imp[i - Z_COEFF_OFFSET], Z_COEFF_ONE);
354 printf(" %s0x%08x,", (v < 0) ? "-" : " ", abs(v));
358 printf(" * interpolated q%d differences.\n", quality);
360 printf("static int32_t z_dcoeff_q%d[%d] = {", quality, nwing);
361 for (i = 1; i <= nwing; i++) {
367 v = fx_floor(v, Z_INTERP_COEFF_ONE);
368 if (abs(v) > abs(largest_interp))
370 printf(" %s0x%08x,", (v < 0) ? "-" : " ", abs(v));
377 function filter_parse(s, a, i, attn, alen)
382 if (alen > 0 && a[1] == "OVERSAMPLING_FACTOR") {
385 init_drift(floor(a[2]));
389 if (alen == 1 || alen == 2) {
390 if (a[1] == "NYQUIST_HOVER") {
392 Z_NYQUIST_HOVER = (i > 0.0 && i < 1.0) ? i : 0.0;
397 attn = Z_KAISER_ATTN_DEFAULT;
398 Popts["beta"] = Z_KAISER_BETA_DEFAULT;
399 } else if (Z_WINDOWS[a[1]] < Z_WINDOW_KAISER) {
400 Popts["beta"] = Z_WINDOWS[a[1]];
405 i = 1.0 - (6.44 / i);
406 Popts["rolloff"] = rolloff_round(i);
410 Popts["beta"] = kaiserAttn2Beta(attn);
416 i = kaiserRolloff(i, attn);
417 Popts["rolloff"] = rolloff_round(i);
422 if (!(alen == 3 || alen == 4))
427 if (a[1] == "kaiser") {
429 Popts["beta"] = 1.0 * a[i++];
431 Popts["beta"] = Z_KAISER_BETA_DEFAULT;
432 } else if (Z_WINDOWS[a[1]] < Z_WINDOW_KAISER)
433 Popts["beta"] = Z_WINDOWS[a[1]];
434 else if (1.0 * a[1] < Z_WINDOW_KAISER)
437 Popts["beta"] = kaiserAttn2Beta(1.0 * a[1]);
438 Popts["nmult"] = tap_round(a[i++]);
439 if (a[1] == "kaiser" && alen == 3)
440 i = kaiserRolloff(Popts["nmult"], \
441 kaiserBeta2Attn(Popts["beta"]));
444 Popts["rolloff"] = rolloff_round(i);
449 function genscale(bit, s1, s2, scale)
451 s1 = Z_COEFF_SHIFT - (32 - bit);
452 s2 = Z_SHIFT + (32 - bit);
457 scale = sprintf("(v) << %d", abs(s1));
459 scale = sprintf("(v) >> %d", s1);
461 scale = sprintf("(%s) * Z_SCALE_CAST(s)", scale);
464 scale = sprintf("(%s) >> %d", scale, s2);
466 printf("#define Z_SCALE_%d(v, s)\t%s(%s)\n", \
467 bit, (bit < 10) ? "\t" : "", scale);
470 function genlerp(bit, use64, lerp)
472 if ((bit + Z_LINEAR_SHIFT) <= 32) {
473 lerp = sprintf("(((y) - (x)) * (z)) >> %d", Z_LINEAR_SHIFT);
474 } else if (use64 != 0) {
475 if ((bit + Z_LINEAR_SHIFT) <= 64) {
477 "(((int64_t)(y) - (x)) * (z)) " \
482 "((int64_t)((y) >> %d) - ((x) >> %d)) * ", \
484 bit + Z_LINEAR_SHIFT - 64, \
485 bit + Z_LINEAR_SHIFT - 64);
487 lerp = sprintf("(%s) >> %d", lerp, 64 - bit);
491 "(((y) >> %d) - ((x) >> %d)) * (z)", \
492 bit + Z_LINEAR_SHIFT - 32, \
493 bit + Z_LINEAR_SHIFT - 32);
495 lerp = sprintf("(%s) >> %d", lerp, 32 - bit);
498 printf("#define Z_LINEAR_INTERPOLATE_%d(z, x, y)" \
499 "\t\t\t\t%s\\\n\t((x) + (%s))\n", \
500 bit, (bit < 10) ? "\t" : "", lerp);
503 function init_drift(drift, xdrift)
505 xdrift = floor(drift);
507 if (Z_DRIFT_SHIFT != -1) {
508 if (xdrift != Z_DRIFT_SHIFT)
509 printf("#error Z_DRIFT_SHIFT reinitialize!\n");
514 # Initialize filter oversampling factor, or in other word
519 else if (xdrift > 31)
522 Z_DRIFT_SHIFT = xdrift;
523 Z_DRIFT_ONE = shl(1, Z_DRIFT_SHIFT);
525 Z_SHIFT = Z_FULL_SHIFT - Z_DRIFT_SHIFT;
526 Z_ONE = shl(1, Z_SHIFT);
532 M_PI = atan2(0.0, -1.0);
534 INT32_MAX = 1 + ((shl(1, 30) - 1) * 2);
535 INT32_MIN = -1 - INT32_MAX;
540 Z_FULL_ONE = shl(1, Z_FULL_SHIFT);
543 Z_COEFF_ONE = shl(1, Z_COEFF_SHIFT);
545 Z_INTERP_COEFF_SHIFT = 24;
546 Z_INTERP_COEFF_ONE = shl(1, Z_INTERP_COEFF_SHIFT);
548 Z_LINEAR_FULL_SHIFT = Z_FULL_SHIFT;
549 Z_LINEAR_FULL_ONE = shl(1, Z_LINEAR_FULL_SHIFT);
551 Z_LINEAR_UNSHIFT = Z_LINEAR_FULL_SHIFT - Z_LINEAR_SHIFT;
552 Z_LINEAR_ONE = shl(1, Z_LINEAR_SHIFT)
554 Z_DRIFT_SHIFT_DEFAULT = 5;
556 # meehhhh... let it overflow...
558 #Z_SCALE_ONE = shl(1, Z_SCALE_SHIFT);
560 Z_WINDOW_KAISER = 0.0;
561 Z_WINDOW_BLACKMAN_NUTTALL = -1.0;
562 Z_WINDOW_NUTTALL = -2.0;
563 Z_WINDOW_BLACKMAN_HARRIS = -3.0;
564 Z_WINDOW_BLACKMAN = -4.0;
565 Z_WINDOW_HAMMING = -5.0;
566 Z_WINDOW_HANN = -6.0;
568 Z_WINDOWS["blackman_nuttall"] = Z_WINDOW_BLACKMAN_NUTTALL;
569 Z_WINDOWS["nuttall"] = Z_WINDOW_NUTTALL;
570 Z_WINDOWS["blackman_harris"] = Z_WINDOW_BLACKMAN_HARRIS;
571 Z_WINDOWS["blackman"] = Z_WINDOW_BLACKMAN;
572 Z_WINDOWS["hamming"] = Z_WINDOW_HAMMING;
573 Z_WINDOWS["hann"] = Z_WINDOW_HANN;
575 Z_KAISER_2_BLACKMAN_BETA = 8.568611;
576 Z_KAISER_2_BLACKMAN_NUTTALL_BETA = 11.98;
578 Z_KAISER_ATTN_DEFAULT = 100;
579 Z_KAISER_BETA_DEFAULT = kaiserAttn2Beta(Z_KAISER_ATTN_DEFAULT);
581 Z_KAISER_EPSILON = 1e-21;
584 # This is practically a joke.
586 Z_NYQUIST_HOVER = 0.0;
588 smallest = 10.000000;
594 ARGV[ARGC++] = "100:8:0.85";
595 ARGV[ARGC++] = "100:36:0.92";
596 ARGV[ARGC++] = "100:164:0.97";
597 #ARGV[ARGC++] = "100:8";
598 #ARGV[ARGC++] = "100:16";
599 #ARGV[ARGC++] = "100:32:0.7929";
600 #ARGV[ARGC++] = "100:64:0.8990";
601 #ARGV[ARGC++] = "100:128:0.9499";
604 printf("#ifndef _FEEDER_RATE_GEN_H_\n");
605 printf("#define _FEEDER_RATE_GEN_H_\n\n");
607 printf(" * Generated using feeder_rate_mkfilter.awk, heaven, wind and awesome.\n");
609 printf(" * DO NOT EDIT!\n");
611 printf("#define FEEDER_RATE_PRESETS\t\"");
612 for (i = 1; i < ARGC; i++)
613 printf("%s%s", (i == 1) ? "" : " ", ARGV[i]);
616 for (i = 1; i < ARGC; i++) {
617 if (filter_parse(ARGV[i]) == 0) {
618 beta = Popts["beta"];
619 nmult = Popts["nmult"];
620 rolloff = Popts["rolloff"];
621 if (Z_DRIFT_SHIFT == -1)
622 init_drift(Z_DRIFT_SHIFT_DEFAULT);
623 ztab[imp["quality"] - 2] = \
624 mkfilter(imp, nmult, rolloff, beta, Z_DRIFT_ONE);
633 #if (length(ztab) > 0) {
635 # for (i = 0; i < length(ztab); i++) {
639 # printf("static int32_t z_coeff_zero[%d] = {", j);
640 # for (i = 0; i < j; i++) {
645 # printf("\n};\n\n");
650 printf("static const struct {\n");
651 printf("\tint32_t len;\n");
652 printf("\tint32_t *coeff;\n");
653 printf("\tint32_t *dcoeff;\n");
654 printf("} z_coeff_tab[] = {\n");
655 if (length(ztab) > 0) {
657 for (i = 0; i < length(ztab); i++) {
661 j = length(sprintf("%d", j));
662 lfmt = sprintf("%%%dd", j);
663 j = length(sprintf("z_coeff_q%d", length(ztab) + 1));
664 zcfmt = sprintf("%%-%ds", j);
665 zdcfmt = sprintf("%%-%ds", j + 1);
667 for (i = 0; i < length(ztab); i++) {
668 l = sprintf(lfmt, ztab[i]);
669 zc = sprintf("z_coeff_q%d", i + 2);
670 zc = sprintf(zcfmt, zc);
671 zdc = sprintf("z_dcoeff_q%d", i + 2);
672 zdc = sprintf(zdcfmt, zdc);
673 printf("\t{ %s, %s, %s },\n", l, zc, zdc);
676 printf("\t{ 0, NULL, NULL }\n");
680 #v = shr(Z_ONE - 1, Z_UNSHIFT) * abs(largest_interp);
681 #while (v < 0 || v > INT32_MAX) {
683 # v = shr(Z_ONE - 1, Z_UNSHIFT) * abs(largest_interp);
685 v = ((Z_ONE - 1) * abs(largest_interp)) / INT32_MAX;
686 Z_UNSHIFT = ceil(log(v) / log(2.0));
687 Z_INTERP_SHIFT = Z_SHIFT - Z_UNSHIFT + Z_INTERP_COEFF_SHIFT;
689 Z_INTERP_UNSHIFT = (Z_SHIFT - Z_UNSHIFT) + Z_INTERP_COEFF_SHIFT \
692 printf("#define Z_COEFF_TAB_SIZE\t\t\t\t\t\t\\\n");
693 printf("\t((int32_t)(sizeof(z_coeff_tab) /");
694 printf(" sizeof(z_coeff_tab[0])))\n\n");
695 printf("#define Z_COEFF_OFFSET\t\t%d\n\n", Z_COEFF_OFFSET);
696 printf("#define Z_RSHIFT(x, y)\t\t(((x) + " \
697 "(1 << ((y) - 1))) >> (y))\n");
698 printf("#define Z_RSHIFT_L(x, y)\t(((x) + " \
699 "(1LL << ((y) - 1))) >> (y))\n\n");
700 printf("#define Z_FULL_SHIFT\t\t%d\n", Z_FULL_SHIFT);
701 printf("#define Z_FULL_ONE\t\t0x%08x%s\n", Z_FULL_ONE, \
702 (Z_FULL_ONE > INT32_MAX) ? "U" : "");
704 printf("#define Z_DRIFT_SHIFT\t\t%d\n", Z_DRIFT_SHIFT);
705 #printf("#define Z_DRIFT_ONE\t\t0x%08x\n", Z_DRIFT_ONE);
707 printf("#define Z_SHIFT\t\t\t%d\n", Z_SHIFT);
708 printf("#define Z_ONE\t\t\t0x%08x\n", Z_ONE);
709 printf("#define Z_MASK\t\t\t0x%08x\n", Z_MASK);
711 printf("#define Z_COEFF_SHIFT\t\t%d\n", Z_COEFF_SHIFT);
712 zinterphp = "(z) * (d)";
713 zinterpunshift = Z_SHIFT + Z_INTERP_COEFF_SHIFT - Z_COEFF_SHIFT;
714 if (zinterpunshift > 0) {
715 v = (Z_ONE - 1) * abs(largest_interp);
716 if (v < INT32_MIN || v > INT32_MAX)
717 zinterphp = sprintf("(int64_t)%s", zinterphp);
718 zinterphp = sprintf("(%s) >> %d", zinterphp, zinterpunshift);
719 } else if (zinterpunshift < 0)
720 zinterphp = sprintf("(%s) << %d", zinterphp, \
721 abs(zinterpunshift));
725 zinterp = sprintf("(z) >> %d", Z_UNSHIFT);
726 zinterp = sprintf("(%s) * (d)", zinterp);
727 if (Z_INTERP_UNSHIFT < 0)
728 zinterp = sprintf("(%s) << %d", zinterp, \
729 abs(Z_INTERP_UNSHIFT));
730 else if (Z_INTERP_UNSHIFT > 0)
731 zinterp = sprintf("(%s) >> %d", zinterp, Z_INTERP_UNSHIFT);
732 if (zinterphp != zinterp) {
733 printf("\n#ifdef SND_FEEDER_RATE_HP\n");
734 printf("#define Z_COEFF_INTERPOLATE(z, c, d)" \
735 "\t\t\t\t\t\\\n\t((c) + (%s))\n", zinterphp);
737 printf("#define Z_COEFF_INTERPOLATE(z, c, d)" \
738 "\t\t\t\t\t\\\n\t((c) + (%s))\n", zinterp);
741 printf("#define Z_COEFF_INTERPOLATE(z, c, d)" \
742 "\t\t\t\t\t\\\n\t((c) + (%s))\n", zinterp);
744 #printf("#define Z_SCALE_SHIFT\t\t%d\n", Z_SCALE_SHIFT);
745 #printf("#define Z_SCALE_ONE\t\t0x%08x%s\n", Z_SCALE_ONE, \
746 # (Z_SCALE_ONE > INT32_MAX) ? "U" : "");
748 printf("#define Z_SCALE_CAST(s)\t\t((uint32_t)(s))\n");
754 printf("#define Z_LINEAR_FULL_ONE\t0x%08xU\n", Z_LINEAR_FULL_ONE);
755 printf("#define Z_LINEAR_SHIFT\t\t%d\n", Z_LINEAR_SHIFT);
756 printf("#define Z_LINEAR_UNSHIFT\t%d\n", Z_LINEAR_UNSHIFT);
757 printf("#define Z_LINEAR_ONE\t\t0x%08x\n", Z_LINEAR_ONE);
759 printf("#ifdef SND_PCM_64\n");
764 printf("#else\t/* !SND_PCM_64 */\n");
769 printf("#endif\t/* SND_PCM_64 */\n");
771 printf("#define Z_QUALITY_ZOH\t\t0\n");
772 printf("#define Z_QUALITY_LINEAR\t1\n");
773 printf("#define Z_QUALITY_SINC\t\t%d\n", \
774 floor((length(ztab) - 1) / 2) + 2);
776 printf("#define Z_QUALITY_MIN\t\t0\n");
777 printf("#define Z_QUALITY_MAX\t\t%d\n", length(ztab) + 1);
778 printf("\n/*\n * smallest: %.32f\n * largest: %.32f\n *\n", \
780 printf(" * z_unshift=%d, z_interp_shift=%d\n *\n", \
781 Z_UNSHIFT, Z_INTERP_SHIFT);
782 v = shr(Z_ONE - 1, Z_UNSHIFT) * abs(largest_interp);
783 printf(" * largest interpolation multiplication: %d\n */\n", v);
784 if (v < INT32_MIN || v > INT32_MAX) {
785 printf("\n#ifndef SND_FEEDER_RATE_HP\n");
786 printf("#error interpolation overflow, please reduce" \
787 " Z_INTERP_SHIFT\n");
791 printf("\n#endif /* !_FEEDER_RATE_GEN_H_ */\n");