diff options
Diffstat (limited to 'libavutil/rational.c')
| -rw-r--r-- | libavutil/rational.c | 73 |
1 files changed, 67 insertions, 6 deletions
diff --git a/libavutil/rational.c b/libavutil/rational.c index 4053936194..55a8dd5897 100644 --- a/libavutil/rational.c +++ b/libavutil/rational.c @@ -2,20 +2,20 @@ * rational numbers * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -110,11 +110,14 @@ AVRational av_d2q(double d, int max) int64_t den; if (isnan(d)) return (AVRational) { 0,0 }; - if (isinf(d)) + if (fabs(d) > INT_MAX + 3LL) return (AVRational) { d < 0 ? -1 : 1, 0 }; exponent = FFMAX( (int)(log(fabs(d) + 1e-20)/LOG2), 0); den = 1LL << (61 - exponent); - av_reduce(&a.num, &a.den, (int64_t)(d * den + 0.5), den, max); + // (int64_t)rint() and llrint() do not work with gcc on ia64 and sparc64 + av_reduce(&a.num, &a.den, floor(d * den + 0.5), den, max); + if ((!a.num || !a.den) && d && max>0 && max<INT_MAX) + av_reduce(&a.num, &a.den, floor(d * den + 0.5), den, INT_MAX); return a; } @@ -143,3 +146,61 @@ int av_find_nearest_q_idx(AVRational q, const AVRational* q_list) return nearest_q_idx; } + +#ifdef TEST +int main(void) +{ + AVRational a,b,r; + for (a.num = -2; a.num <= 2; a.num++) { + for (a.den = -2; a.den <= 2; a.den++) { + for (b.num = -2; b.num <= 2; b.num++) { + for (b.den = -2; b.den <= 2; b.den++) { + int c = av_cmp_q(a,b); + double d = av_q2d(a) == av_q2d(b) ? + 0 : (av_q2d(a) - av_q2d(b)); + if (d > 0) d = 1; + else if (d < 0) d = -1; + else if (d != d) d = INT_MIN; + if (c != d) + av_log(NULL, AV_LOG_ERROR, "%d/%d %d/%d, %d %f\n", a.num, + a.den, b.num, b.den, c,d); + r = av_sub_q(av_add_q(b,a), b); + if(b.den && (r.num*a.den != a.num*r.den || !r.num != !a.num || !r.den != !a.den)) + av_log(NULL, AV_LOG_ERROR, "%d/%d ", r.num, r.den); + } + } + } + } + + for (a.num = 1; a.num <= 10; a.num++) { + for (a.den = 1; a.den <= 10; a.den++) { + if (av_gcd(a.num, a.den) > 1) + continue; + for (b.num = 1; b.num <= 10; b.num++) { + for (b.den = 1; b.den <= 10; b.den++) { + int start; + if (av_gcd(b.num, b.den) > 1) + continue; + if (av_cmp_q(b, a) < 0) + continue; + for (start = 0; start < 10 ; start++) { + int acc= start; + int i; + + for (i = 0; i<100; i++) { + int exact = start + av_rescale_q(i+1, b, a); + acc = av_add_stable(a, acc, b, 1); + if (FFABS(acc - exact) > 2) { + av_log(NULL, AV_LOG_ERROR, "%d/%d %d/%d, %d %d\n", a.num, + a.den, b.num, b.den, acc, exact); + return 1; + } + } + } + } + } + } + } + return 0; +} +#endif |