1#!/usr/bin/awk -f
2#
3# Copyright (c) 2007-2009 Ariff Abdullah <ariff@FreeBSD.org>
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions
8# are met:

--- 10 unchanged lines hidden (view full) ---

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
25# SUCH DAMAGE.
26#
27# $FreeBSD: head/sys/tools/sound/feeder_rate_mkfilter.awk 195283 2009-07-02 10:02:10Z ariff $
28#
29
30#
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".

--- 345 unchanged lines hidden (view full) ---

381
382 if (alen > 0 && a[1] == "OVERSAMPLING_FACTOR") {
383 if (alen != 2)
384 return (-1);
385 init_drift(floor(a[2]));
386 return (-1);
387 }
388
389 if (alen == 1 || alen == 2) {
390 if (a[1] == "NYQUIST_HOVER") {
391 i = 1.0 * a[2];
392 Z_NYQUIST_HOVER = (i > 0.0 && i < 1.0) ? i : 0.0;
393 return (-1);
394 }
395 i = 1;
396 if (alen == 1) {

--- 46 unchanged lines hidden (view full) ---

443 i = 1.0 * a[i];
444 Popts["rolloff"] = rolloff_round(i);
445
446 return (0);
447}
448
449function genscale(bit, s1, s2, scale)
450{
451 s1 = Z_COEFF_SHIFT - (32 - bit);
452 s2 = Z_SHIFT + (32 - bit);
453
454 if (s1 == 0)
455 scale = "v";
456 else if (s1 < 0)
457 scale = sprintf("(v) << %d", abs(s1));
458 else
459 scale = sprintf("(v) >> %d", s1);

--- 62 unchanged lines hidden (view full) ---

522 Z_DRIFT_SHIFT = xdrift;
523 Z_DRIFT_ONE = shl(1, Z_DRIFT_SHIFT);
524
525 Z_SHIFT = Z_FULL_SHIFT - Z_DRIFT_SHIFT;
526 Z_ONE = shl(1, Z_SHIFT);
527 Z_MASK = Z_ONE - 1;
528}
529
530BEGIN {
531 I0_EPSILON = 1e-21;
532 M_PI = atan2(0.0, -1.0);
533
534 INT32_MAX = 1 + ((shl(1, 30) - 1) * 2);
535 INT32_MIN = -1 - INT32_MAX;
536
537 Z_COEFF_OFFSET = 5;
538
539 Z_FULL_SHIFT = 30;
540 Z_FULL_ONE = shl(1, Z_FULL_SHIFT);
541
542 Z_COEFF_SHIFT = 28;
543 Z_COEFF_ONE = shl(1, Z_COEFF_SHIFT);
544
545 Z_INTERP_COEFF_SHIFT = 24;
546 Z_INTERP_COEFF_ONE = shl(1, Z_INTERP_COEFF_SHIFT);
547
548 Z_LINEAR_FULL_SHIFT = Z_FULL_SHIFT;
549 Z_LINEAR_FULL_ONE = shl(1, Z_LINEAR_FULL_SHIFT);
550 Z_LINEAR_SHIFT = 8;
551 Z_LINEAR_UNSHIFT = Z_LINEAR_FULL_SHIFT - Z_LINEAR_SHIFT;
552 Z_LINEAR_ONE = shl(1, Z_LINEAR_SHIFT)

--- 62 unchanged lines hidden (view full) ---

615 imp["quality"] = 2;
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);
625 imp["quality"]++;
626 }
627 }
628
629 printf("\n");
630 #

--- 115 unchanged lines hidden (view full) ---

746 # (Z_SCALE_ONE > INT32_MAX) ? "U" : "");
747 printf("\n");
748 printf("#define Z_SCALE_CAST(s)\t\t((uint32_t)(s))\n");
749 genscale(8);
750 genscale(16);
751 genscale(24);
752 genscale(32);
753 printf("\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);
758 printf("\n");
759 printf("#ifdef SND_PCM_64\n");
760 genlerp(8, 1);
761 genlerp(16, 1);

--- 8 unchanged lines hidden (view full) ---

770 printf("\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);
775 printf("\n");
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", \
779 smallest, largest);
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");
788 printf("#endif\n");
789 }
790
791 printf("\n#endif /* !_FEEDER_RATE_GEN_H_ */\n");
792}