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 > 0 && a[1] == "COEFFICIENT_BIT") {
392 init_coeff_bit(floor(a[2]));
396 if (alen > 0 && a[1] == "ACCUMULATOR_BIT") {
399 init_accum_bit(floor(a[2]));
403 if (alen > 0 && a[1] == "INTERPOLATOR") {
406 init_coeff_interpolator(toupper(a[2]));
410 if (alen == 1 || alen == 2) {
411 if (a[1] == "NYQUIST_HOVER") {
413 Z_NYQUIST_HOVER = (i > 0.0 && i < 1.0) ? i : 0.0;
418 attn = Z_KAISER_ATTN_DEFAULT;
419 Popts["beta"] = Z_KAISER_BETA_DEFAULT;
420 } else if (Z_WINDOWS[a[1]] < Z_WINDOW_KAISER) {
421 Popts["beta"] = Z_WINDOWS[a[1]];
426 i = 1.0 - (6.44 / i);
427 Popts["rolloff"] = rolloff_round(i);
431 Popts["beta"] = kaiserAttn2Beta(attn);
437 i = kaiserRolloff(i, attn);
438 Popts["rolloff"] = rolloff_round(i);
443 if (!(alen == 3 || alen == 4))
448 if (a[1] == "kaiser") {
450 Popts["beta"] = 1.0 * a[i++];
452 Popts["beta"] = Z_KAISER_BETA_DEFAULT;
453 } else if (Z_WINDOWS[a[1]] < Z_WINDOW_KAISER)
454 Popts["beta"] = Z_WINDOWS[a[1]];
455 else if (1.0 * a[1] < Z_WINDOW_KAISER)
458 Popts["beta"] = kaiserAttn2Beta(1.0 * a[1]);
459 Popts["nmult"] = tap_round(a[i++]);
460 if (a[1] == "kaiser" && alen == 3)
461 i = kaiserRolloff(Popts["nmult"], \
462 kaiserBeta2Attn(Popts["beta"]));
465 Popts["rolloff"] = rolloff_round(i);
470 function genscale(bit, s1, s2, scale)
472 if ((bit + Z_COEFF_SHIFT) > Z_ACCUMULATOR_BIT)
473 s1 = Z_COEFF_SHIFT - \
474 (32 - (Z_ACCUMULATOR_BIT - Z_COEFF_SHIFT));
476 s1 = Z_COEFF_SHIFT - (32 - bit);
478 s2 = Z_SHIFT + (32 - bit);
483 scale = sprintf("(v) << %d", abs(s1));
485 scale = sprintf("(v) >> %d", s1);
487 scale = sprintf("(%s) * Z_SCALE_CAST(s)", scale);
490 scale = sprintf("(%s) >> %d", scale, s2);
492 printf("#define Z_SCALE_%d(v, s)\t%s(%s)\n", \
493 bit, (bit < 10) ? "\t" : "", scale);
496 function genlerp(bit, use64, lerp)
498 if ((bit + Z_LINEAR_SHIFT) <= 32) {
499 lerp = sprintf("(((y) - (x)) * (z)) >> %d", Z_LINEAR_SHIFT);
500 } else if (use64 != 0) {
501 if ((bit + Z_LINEAR_SHIFT) <= 64) {
503 "(((int64_t)(y) - (x)) * (z)) " \
508 "((int64_t)((y) >> %d) - ((x) >> %d)) * ", \
510 bit + Z_LINEAR_SHIFT - 64, \
511 bit + Z_LINEAR_SHIFT - 64);
513 lerp = sprintf("(%s) >> %d", lerp, 64 - bit);
517 "(((y) >> %d) - ((x) >> %d)) * (z)", \
518 bit + Z_LINEAR_SHIFT - 32, \
519 bit + Z_LINEAR_SHIFT - 32);
521 lerp = sprintf("(%s) >> %d", lerp, 32 - bit);
524 printf("#define Z_LINEAR_INTERPOLATE_%d(z, x, y)" \
525 "\t\t\t\t%s\\\n\t((x) + (%s))\n", \
526 bit, (bit < 10) ? "\t" : "", lerp);
529 function init_drift(drift, xdrift)
531 xdrift = floor(drift);
533 if (Z_DRIFT_SHIFT != -1) {
534 if (xdrift != Z_DRIFT_SHIFT)
535 printf("#error Z_DRIFT_SHIFT reinitialize!\n");
540 # Initialize filter oversampling factor, or in other word
545 else if (xdrift > 31)
548 Z_DRIFT_SHIFT = xdrift;
549 Z_DRIFT_ONE = shl(1, Z_DRIFT_SHIFT);
551 Z_SHIFT = Z_FULL_SHIFT - Z_DRIFT_SHIFT;
552 Z_ONE = shl(1, Z_SHIFT);
556 function init_coeff_bit(cbit, xcbit)
560 if (Z_COEFF_SHIFT != 0) {
561 if (xcbit != Z_COEFF_SHIFT)
562 printf("#error Z_COEFF_SHIFT reinitialize!\n");
567 # Initialize dynamic range of coefficients.
574 Z_COEFF_SHIFT = xcbit;
575 Z_COEFF_ONE = shl(1, Z_COEFF_SHIFT);
578 function init_accum_bit(accbit, xaccbit)
580 xaccbit = floor(accbit);
582 if (Z_ACCUMULATOR_BIT != 0) {
583 if (xaccbit != Z_ACCUMULATOR_BIT)
584 printf("#error Z_ACCUMULATOR_BIT reinitialize!\n");
589 # Initialize dynamic range of accumulator.
593 else if (xaccbit < 32)
596 Z_ACCUMULATOR_BIT = xaccbit;
599 function init_coeff_interpolator(interp)
602 # Validate interpolator type.
604 if (interp == "ZOH" || interp == "LINEAR" || \
605 interp == "QUADRATIC" || interp == "HERMITE" || \
606 interp == "BSPLINE" || interp == "OPT32X" || \
607 interp == "OPT16X" || interp == "OPT8X" || \
608 interp == "OPT4X" || interp == "OPT2X")
609 Z_COEFF_INTERPOLATOR = interp;
614 M_PI = atan2(0.0, -1.0);
616 INT32_MAX = 1 + ((shl(1, 30) - 1) * 2);
617 INT32_MIN = -1 - INT32_MAX;
621 Z_ACCUMULATOR_BIT_DEFAULT = 58;
622 Z_ACCUMULATOR_BIT = 0;
625 Z_FULL_ONE = shl(1, Z_FULL_SHIFT);
627 Z_COEFF_SHIFT_DEFAULT = 30;
631 Z_COEFF_INTERPOLATOR = 0;
633 Z_INTERP_COEFF_SHIFT = 24;
634 Z_INTERP_COEFF_ONE = shl(1, Z_INTERP_COEFF_SHIFT);
636 Z_LINEAR_FULL_SHIFT = Z_FULL_SHIFT;
637 Z_LINEAR_FULL_ONE = shl(1, Z_LINEAR_FULL_SHIFT);
639 Z_LINEAR_UNSHIFT = Z_LINEAR_FULL_SHIFT - Z_LINEAR_SHIFT;
640 Z_LINEAR_ONE = shl(1, Z_LINEAR_SHIFT)
642 Z_DRIFT_SHIFT_DEFAULT = 5;
644 # meehhhh... let it overflow...
646 #Z_SCALE_ONE = shl(1, Z_SCALE_SHIFT);
648 Z_WINDOW_KAISER = 0.0;
649 Z_WINDOW_BLACKMAN_NUTTALL = -1.0;
650 Z_WINDOW_NUTTALL = -2.0;
651 Z_WINDOW_BLACKMAN_HARRIS = -3.0;
652 Z_WINDOW_BLACKMAN = -4.0;
653 Z_WINDOW_HAMMING = -5.0;
654 Z_WINDOW_HANN = -6.0;
656 Z_WINDOWS["blackman_nuttall"] = Z_WINDOW_BLACKMAN_NUTTALL;
657 Z_WINDOWS["nuttall"] = Z_WINDOW_NUTTALL;
658 Z_WINDOWS["blackman_harris"] = Z_WINDOW_BLACKMAN_HARRIS;
659 Z_WINDOWS["blackman"] = Z_WINDOW_BLACKMAN;
660 Z_WINDOWS["hamming"] = Z_WINDOW_HAMMING;
661 Z_WINDOWS["hann"] = Z_WINDOW_HANN;
663 Z_KAISER_2_BLACKMAN_BETA = 8.568611;
664 Z_KAISER_2_BLACKMAN_NUTTALL_BETA = 11.98;
666 Z_KAISER_ATTN_DEFAULT = 100;
667 Z_KAISER_BETA_DEFAULT = kaiserAttn2Beta(Z_KAISER_ATTN_DEFAULT);
669 Z_KAISER_EPSILON = 1e-21;
672 # This is practically a joke.
674 Z_NYQUIST_HOVER = 0.0;
676 smallest = 10.000000;
682 ARGV[ARGC++] = "100:8:0.85";
683 ARGV[ARGC++] = "100:36:0.92";
684 ARGV[ARGC++] = "100:164:0.97";
685 #ARGV[ARGC++] = "100:8";
686 #ARGV[ARGC++] = "100:16";
687 #ARGV[ARGC++] = "100:32:0.7929";
688 #ARGV[ARGC++] = "100:64:0.8990";
689 #ARGV[ARGC++] = "100:128:0.9499";
692 printf("#ifndef _FEEDER_RATE_GEN_H_\n");
693 printf("#define _FEEDER_RATE_GEN_H_\n\n");
695 printf(" * Generated using feeder_rate_mkfilter.awk, heaven, wind and awesome.\n");
697 printf(" * DO NOT EDIT!\n");
699 printf("#define FEEDER_RATE_PRESETS\t\"");
700 for (i = 1; i < ARGC; i++)
701 printf("%s%s", (i == 1) ? "" : " ", ARGV[i]);
704 for (i = 1; i < ARGC; i++) {
705 if (filter_parse(ARGV[i]) == 0) {
706 beta = Popts["beta"];
707 nmult = Popts["nmult"];
708 rolloff = Popts["rolloff"];
709 if (Z_DRIFT_SHIFT == -1)
710 init_drift(Z_DRIFT_SHIFT_DEFAULT);
711 if (Z_COEFF_SHIFT == 0)
712 init_coeff_bit(Z_COEFF_SHIFT_DEFAULT);
713 if (Z_ACCUMULATOR_BIT == 0)
714 init_accum_bit(Z_ACCUMULATOR_BIT_DEFAULT);
715 ztab[imp["quality"] - 2] = \
716 mkfilter(imp, nmult, rolloff, beta, Z_DRIFT_ONE);
725 #if (length(ztab) > 0) {
727 # for (i = 0; i < length(ztab); i++) {
731 # printf("static int32_t z_coeff_zero[%d] = {", j);
732 # for (i = 0; i < j; i++) {
737 # printf("\n};\n\n");
742 printf("static const struct {\n");
743 printf("\tint32_t len;\n");
744 printf("\tint32_t *coeff;\n");
745 printf("\tint32_t *dcoeff;\n");
746 printf("} z_coeff_tab[] = {\n");
747 if (length(ztab) > 0) {
749 for (i = 0; i < length(ztab); i++) {
753 j = length(sprintf("%d", j));
754 lfmt = sprintf("%%%dd", j);
755 j = length(sprintf("z_coeff_q%d", length(ztab) + 1));
756 zcfmt = sprintf("%%-%ds", j);
757 zdcfmt = sprintf("%%-%ds", j + 1);
759 for (i = 0; i < length(ztab); i++) {
760 l = sprintf(lfmt, ztab[i]);
761 zc = sprintf("z_coeff_q%d", i + 2);
762 zc = sprintf(zcfmt, zc);
763 zdc = sprintf("z_dcoeff_q%d", i + 2);
764 zdc = sprintf(zdcfmt, zdc);
765 printf("\t{ %s, %s, %s },\n", l, zc, zdc);
768 printf("\t{ 0, NULL, NULL }\n");
772 #v = shr(Z_ONE - 1, Z_UNSHIFT) * abs(largest_interp);
773 #while (v < 0 || v > INT32_MAX) {
775 # v = shr(Z_ONE - 1, Z_UNSHIFT) * abs(largest_interp);
777 v = ((Z_ONE - 1) * abs(largest_interp)) / INT32_MAX;
778 Z_UNSHIFT = ceil(log(v) / log(2.0));
779 Z_INTERP_SHIFT = Z_SHIFT - Z_UNSHIFT + Z_INTERP_COEFF_SHIFT;
781 Z_INTERP_UNSHIFT = (Z_SHIFT - Z_UNSHIFT) + Z_INTERP_COEFF_SHIFT \
784 printf("#define Z_COEFF_TAB_SIZE\t\t\t\t\t\t\\\n");
785 printf("\t((int32_t)(sizeof(z_coeff_tab) /");
786 printf(" sizeof(z_coeff_tab[0])))\n\n");
787 printf("#define Z_COEFF_OFFSET\t\t%d\n\n", Z_COEFF_OFFSET);
788 printf("#define Z_RSHIFT(x, y)\t\t(((x) + " \
789 "(1 << ((y) - 1))) >> (y))\n");
790 printf("#define Z_RSHIFT_L(x, y)\t(((x) + " \
791 "(1LL << ((y) - 1))) >> (y))\n\n");
792 printf("#define Z_FULL_SHIFT\t\t%d\n", Z_FULL_SHIFT);
793 printf("#define Z_FULL_ONE\t\t0x%08x%s\n", Z_FULL_ONE, \
794 (Z_FULL_ONE > INT32_MAX) ? "U" : "");
796 printf("#define Z_DRIFT_SHIFT\t\t%d\n", Z_DRIFT_SHIFT);
797 #printf("#define Z_DRIFT_ONE\t\t0x%08x\n", Z_DRIFT_ONE);
799 printf("#define Z_SHIFT\t\t\t%d\n", Z_SHIFT);
800 printf("#define Z_ONE\t\t\t0x%08x\n", Z_ONE);
801 printf("#define Z_MASK\t\t\t0x%08x\n", Z_MASK);
803 printf("#define Z_COEFF_SHIFT\t\t%d\n", Z_COEFF_SHIFT);
804 zinterphp = "(z) * (d)";
805 zinterpunshift = Z_SHIFT + Z_INTERP_COEFF_SHIFT - Z_COEFF_SHIFT;
806 if (zinterpunshift > 0) {
807 v = (Z_ONE - 1) * abs(largest_interp);
808 if (v < INT32_MIN || v > INT32_MAX)
809 zinterphp = sprintf("(int64_t)%s", zinterphp);
810 zinterphp = sprintf("(%s) >> %d", zinterphp, zinterpunshift);
811 } else if (zinterpunshift < 0)
812 zinterphp = sprintf("(%s) << %d", zinterphp, \
813 abs(zinterpunshift));
817 zinterp = sprintf("(z) >> %d", Z_UNSHIFT);
818 zinterp = sprintf("(%s) * (d)", zinterp);
819 if (Z_INTERP_UNSHIFT < 0)
820 zinterp = sprintf("(%s) << %d", zinterp, \
821 abs(Z_INTERP_UNSHIFT));
822 else if (Z_INTERP_UNSHIFT > 0)
823 zinterp = sprintf("(%s) >> %d", zinterp, Z_INTERP_UNSHIFT);
824 if (zinterphp != zinterp) {
825 printf("\n#ifdef SND_FEEDER_RATE_HP\n");
826 printf("#define Z_COEFF_INTERPOLATE(z, c, d)" \
827 "\t\t\t\t\t\\\n\t((c) + (%s))\n", zinterphp);
829 printf("#define Z_COEFF_INTERPOLATE(z, c, d)" \
830 "\t\t\t\t\t\\\n\t((c) + (%s))\n", zinterp);
833 printf("#define Z_COEFF_INTERPOLATE(z, c, d)" \
834 "\t\t\t\t\t\\\n\t((c) + (%s))\n", zinterp);
836 #printf("#define Z_SCALE_SHIFT\t\t%d\n", Z_SCALE_SHIFT);
837 #printf("#define Z_SCALE_ONE\t\t0x%08x%s\n", Z_SCALE_ONE, \
838 # (Z_SCALE_ONE > INT32_MAX) ? "U" : "");
840 printf("#define Z_SCALE_CAST(s)\t\t((uint32_t)(s))\n");
846 printf("#define Z_ACCUMULATOR_BIT\t%d\n\n", Z_ACCUMULATOR_BIT)
847 for (i = 8; i <= 32; i += 8) {
848 gbit = ((i + Z_COEFF_SHIFT) > Z_ACCUMULATOR_BIT) ? \
849 (i - (Z_ACCUMULATOR_BIT - Z_COEFF_SHIFT)) : 0;
850 printf("#define Z_GUARD_BIT_%d\t\t%d\n", i, gbit);
852 printf("#define Z_NORM_%d(v)\t\t(v)\n\n", i);
854 printf("#define Z_NORM_%d(v)\t\t" \
855 "((v) >> Z_GUARD_BIT_%d)\n\n", i, i);
858 printf("#define Z_LINEAR_FULL_ONE\t0x%08xU\n", Z_LINEAR_FULL_ONE);
859 printf("#define Z_LINEAR_SHIFT\t\t%d\n", Z_LINEAR_SHIFT);
860 printf("#define Z_LINEAR_UNSHIFT\t%d\n", Z_LINEAR_UNSHIFT);
861 printf("#define Z_LINEAR_ONE\t\t0x%08x\n", Z_LINEAR_ONE);
863 printf("#ifdef SND_PCM_64\n");
868 printf("#else\t/* !SND_PCM_64 */\n");
873 printf("#endif\t/* SND_PCM_64 */\n");
875 printf("#define Z_QUALITY_ZOH\t\t0\n");
876 printf("#define Z_QUALITY_LINEAR\t1\n");
877 printf("#define Z_QUALITY_SINC\t\t%d\n", \
878 floor((length(ztab) - 1) / 2) + 2);
880 printf("#define Z_QUALITY_MIN\t\t0\n");
881 printf("#define Z_QUALITY_MAX\t\t%d\n", length(ztab) + 1);
882 if (Z_COEFF_INTERPOLATOR != 0)
883 printf("\n#define Z_COEFF_INTERP_%s\t1\n", \
884 Z_COEFF_INTERPOLATOR);
885 printf("\n/*\n * smallest: %.32f\n * largest: %.32f\n *\n", \
887 printf(" * z_unshift=%d, z_interp_shift=%d\n *\n", \
888 Z_UNSHIFT, Z_INTERP_SHIFT);
889 v = shr(Z_ONE - 1, Z_UNSHIFT) * abs(largest_interp);
890 printf(" * largest interpolation multiplication: %d\n */\n", v);
891 if (v < INT32_MIN || v > INT32_MAX) {
892 printf("\n#ifndef SND_FEEDER_RATE_HP\n");
893 printf("#error interpolation overflow, please reduce" \
894 " Z_INTERP_SHIFT\n");
898 printf("\n#endif /* !_FEEDER_RATE_GEN_H_ */\n");