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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /media/ffvpx/libavutil/mathematics.c
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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diff --git a/media/ffvpx/libavutil/mathematics.c b/media/ffvpx/libavutil/mathematics.c
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+/*
+ * Copyright (c) 2005-2012 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * miscellaneous math routines and tables
+ */
+
+#include <stdint.h>
+#include <limits.h>
+
+#include "mathematics.h"
+#include "libavutil/intmath.h"
+#include "libavutil/common.h"
+#include "avassert.h"
+#include "version.h"
+
+/* Stein's binary GCD algorithm:
+ * https://en.wikipedia.org/wiki/Binary_GCD_algorithm */
+int64_t av_gcd(int64_t a, int64_t b) {
+ int za, zb, k;
+ int64_t u, v;
+ if (a == 0)
+ return b;
+ if (b == 0)
+ return a;
+ za = ff_ctzll(a);
+ zb = ff_ctzll(b);
+ k = FFMIN(za, zb);
+ u = llabs(a >> za);
+ v = llabs(b >> zb);
+ while (u != v) {
+ if (u > v)
+ FFSWAP(int64_t, v, u);
+ v -= u;
+ v >>= ff_ctzll(v);
+ }
+ return (uint64_t)u << k;
+}
+
+int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
+{
+ int64_t r = 0;
+ av_assert2(c > 0);
+ av_assert2(b >=0);
+ av_assert2((unsigned)(rnd&~AV_ROUND_PASS_MINMAX)<=5 && (rnd&~AV_ROUND_PASS_MINMAX)!=4);
+
+ if (c <= 0 || b < 0 || !((unsigned)(rnd&~AV_ROUND_PASS_MINMAX)<=5 && (rnd&~AV_ROUND_PASS_MINMAX)!=4))
+ return INT64_MIN;
+
+ if (rnd & AV_ROUND_PASS_MINMAX) {
+ if (a == INT64_MIN || a == INT64_MAX)
+ return a;
+ rnd -= AV_ROUND_PASS_MINMAX;
+ }
+
+ if (a < 0)
+ return -(uint64_t)av_rescale_rnd(-FFMAX(a, -INT64_MAX), b, c, rnd ^ ((rnd >> 1) & 1));
+
+ if (rnd == AV_ROUND_NEAR_INF)
+ r = c / 2;
+ else if (rnd & 1)
+ r = c - 1;
+
+ if (b <= INT_MAX && c <= INT_MAX) {
+ if (a <= INT_MAX)
+ return (a * b + r) / c;
+ else {
+ int64_t ad = a / c;
+ int64_t a2 = (a % c * b + r) / c;
+ if (ad >= INT32_MAX && b && ad > (INT64_MAX - a2) / b)
+ return INT64_MIN;
+ return ad * b + a2;
+ }
+ } else {
+#if 1
+ uint64_t a0 = a & 0xFFFFFFFF;
+ uint64_t a1 = a >> 32;
+ uint64_t b0 = b & 0xFFFFFFFF;
+ uint64_t b1 = b >> 32;
+ uint64_t t1 = a0 * b1 + a1 * b0;
+ uint64_t t1a = t1 << 32;
+ int i;
+
+ a0 = a0 * b0 + t1a;
+ a1 = a1 * b1 + (t1 >> 32) + (a0 < t1a);
+ a0 += r;
+ a1 += a0 < r;
+
+ for (i = 63; i >= 0; i--) {
+ a1 += a1 + ((a0 >> i) & 1);
+ t1 += t1;
+ if (c <= a1) {
+ a1 -= c;
+ t1++;
+ }
+ }
+ if (t1 > INT64_MAX)
+ return INT64_MIN;
+ return t1;
+ }
+#else
+ AVInteger ai;
+ ai = av_mul_i(av_int2i(a), av_int2i(b));
+ ai = av_add_i(ai, av_int2i(r));
+
+ return av_i2int(av_div_i(ai, av_int2i(c)));
+ }
+#endif
+}
+
+int64_t av_rescale(int64_t a, int64_t b, int64_t c)
+{
+ return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
+}
+
+int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq,
+ enum AVRounding rnd)
+{
+ int64_t b = bq.num * (int64_t)cq.den;
+ int64_t c = cq.num * (int64_t)bq.den;
+ return av_rescale_rnd(a, b, c, rnd);
+}
+
+int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
+{
+ return av_rescale_q_rnd(a, bq, cq, AV_ROUND_NEAR_INF);
+}
+
+int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
+{
+ int64_t a = tb_a.num * (int64_t)tb_b.den;
+ int64_t b = tb_b.num * (int64_t)tb_a.den;
+ if ((FFABS(ts_a)|a|FFABS(ts_b)|b) <= INT_MAX)
+ return (ts_a*a > ts_b*b) - (ts_a*a < ts_b*b);
+ if (av_rescale_rnd(ts_a, a, b, AV_ROUND_DOWN) < ts_b)
+ return -1;
+ if (av_rescale_rnd(ts_b, b, a, AV_ROUND_DOWN) < ts_a)
+ return 1;
+ return 0;
+}
+
+int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod)
+{
+ int64_t c = (a - b) & (mod - 1);
+ if (c > (mod >> 1))
+ c -= mod;
+ return c;
+}
+
+int64_t av_rescale_delta(AVRational in_tb, int64_t in_ts, AVRational fs_tb, int duration, int64_t *last, AVRational out_tb){
+ int64_t a, b, this;
+
+ av_assert0(in_ts != AV_NOPTS_VALUE);
+ av_assert0(duration >= 0);
+
+ if (*last == AV_NOPTS_VALUE || !duration || in_tb.num*(int64_t)out_tb.den <= out_tb.num*(int64_t)in_tb.den) {
+simple_round:
+ *last = av_rescale_q(in_ts, in_tb, fs_tb) + duration;
+ return av_rescale_q(in_ts, in_tb, out_tb);
+ }
+
+ a = av_rescale_q_rnd(2*in_ts-1, in_tb, fs_tb, AV_ROUND_DOWN) >>1;
+ b = (av_rescale_q_rnd(2*in_ts+1, in_tb, fs_tb, AV_ROUND_UP )+1)>>1;
+ if (*last < 2*a - b || *last > 2*b - a)
+ goto simple_round;
+
+ this = av_clip64(*last, a, b);
+ *last = this + duration;
+
+ return av_rescale_q(this, fs_tb, out_tb);
+}
+
+int64_t av_add_stable(AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t inc)
+{
+ int64_t m, d;
+
+ if (inc != 1)
+ inc_tb = av_mul_q(inc_tb, (AVRational) {inc, 1});
+
+ m = inc_tb.num * (int64_t)ts_tb.den;
+ d = inc_tb.den * (int64_t)ts_tb.num;
+
+ if (m % d == 0)
+ return ts + m / d;
+ if (m < d)
+ return ts;
+
+ {
+ int64_t old = av_rescale_q(ts, ts_tb, inc_tb);
+ int64_t old_ts = av_rescale_q(old, inc_tb, ts_tb);
+ return av_rescale_q(old + 1, inc_tb, ts_tb) + (ts - old_ts);
+ }
+}