135 lines
4.9 KiB
C
135 lines
4.9 KiB
C
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/*
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* rational numbers
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/rational.c"
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#include "libavutil/integer.h"
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int main(void)
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{
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AVRational a,b,r;
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int i,j,k;
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static const int64_t numlist[] = {
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INT64_MIN, INT64_MIN+1, INT64_MAX, INT32_MIN, INT32_MAX, 1,0,-1,
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123456789, INT32_MAX-1, INT32_MAX+1LL, UINT32_MAX-1, UINT32_MAX, UINT32_MAX+1LL
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};
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for (a.num = -2; a.num <= 2; a.num++) {
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for (a.den = -2; a.den <= 2; a.den++) {
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for (b.num = -2; b.num <= 2; b.num++) {
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for (b.den = -2; b.den <= 2; b.den++) {
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int c = av_cmp_q(a,b);
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double d = av_q2d(a) == av_q2d(b) ?
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0 : (av_q2d(a) - av_q2d(b));
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if (d > 0) d = 1;
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else if (d < 0) d = -1;
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else if (d != d) d = INT_MIN;
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if (c != d)
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av_log(NULL, AV_LOG_ERROR, "%d/%d %d/%d, %d %f\n", a.num,
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a.den, b.num, b.den, c,d);
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r = av_sub_q(av_add_q(b,a), b);
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if(b.den && (r.num*a.den != a.num*r.den || !r.num != !a.num || !r.den != !a.den))
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av_log(NULL, AV_LOG_ERROR, "%d/%d ", r.num, r.den);
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}
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}
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}
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}
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for (i = 0; i < FF_ARRAY_ELEMS(numlist); i++) {
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int64_t a = numlist[i];
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for (j = 0; j < FF_ARRAY_ELEMS(numlist); j++) {
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int64_t b = numlist[j];
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if (b<=0)
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continue;
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for (k = 0; k < FF_ARRAY_ELEMS(numlist); k++) {
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int64_t c = numlist[k];
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int64_t res;
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AVInteger ai;
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if (c<=0)
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continue;
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res = av_rescale_rnd(a,b,c, AV_ROUND_ZERO);
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ai = av_mul_i(av_int2i(a), av_int2i(b));
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ai = av_div_i(ai, av_int2i(c));
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if (av_cmp_i(ai, av_int2i(INT64_MAX)) > 0 && res == INT64_MIN)
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continue;
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if (av_cmp_i(ai, av_int2i(INT64_MIN)) < 0 && res == INT64_MIN)
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continue;
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if (av_cmp_i(ai, av_int2i(res)) == 0)
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continue;
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// Special exception for INT64_MIN, remove this in case INT64_MIN is handled without off by 1 error
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if (av_cmp_i(ai, av_int2i(res-1)) == 0 && a == INT64_MIN)
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continue;
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av_log(NULL, AV_LOG_ERROR, "%"PRId64" * %"PRId64" / %"PRId64" = %"PRId64" or %"PRId64"\n", a,b,c, res, av_i2int(ai));
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}
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}
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}
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for (a.num = 1; a.num <= 10; a.num++) {
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for (a.den = 1; a.den <= 10; a.den++) {
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if (av_gcd(a.num, a.den) > 1)
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continue;
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for (b.num = 1; b.num <= 10; b.num++) {
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for (b.den = 1; b.den <= 10; b.den++) {
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int start;
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if (av_gcd(b.num, b.den) > 1)
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continue;
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if (av_cmp_q(b, a) < 0)
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continue;
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for (start = 0; start < 10 ; start++) {
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int acc= start;
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int i;
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for (i = 0; i<100; i++) {
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int exact = start + av_rescale_q(i+1, b, a);
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acc = av_add_stable(a, acc, b, 1);
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if (FFABS(acc - exact) > 2) {
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av_log(NULL, AV_LOG_ERROR, "%d/%d %d/%d, %d %d\n", a.num,
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a.den, b.num, b.den, acc, exact);
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return 1;
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}
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}
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}
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}
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}
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}
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}
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for (a.den = 1; a.den < 0x100000000U/3; a.den*=3) {
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for (a.num = -1; a.num < (1<<27); a.num += 1 + a.num/100) {
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float f = av_int2float(av_q2intfloat(a));
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float f2 = av_q2d(a);
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if (fabs(f - f2) > fabs(f)/5000000) {
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av_log(NULL, AV_LOG_ERROR, "%d/%d %f %f\n", a.num,
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a.den, f, f2);
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return 1;
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}
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}
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}
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return 0;
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}
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