c11c2bc2 | /* |
90d4b070 | * Copyright (c) 2005-2012 Michael Niedermayer <michaelni@gmx.at> |
c11c2bc2 | * |
b78e7197 | * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or |
c11c2bc2 | * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either |
b78e7197 | * version 2.1 of the License, or (at your option) any later version. |
c11c2bc2 | * |
b78e7197 | * FFmpeg is distributed in the hope that it will be useful, |
c11c2bc2 | * 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 |
b78e7197 | * License along with FFmpeg; if not, write to the Free Software |
5509bffa | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
c11c2bc2 | */ |
115329f1 | |
c11c2bc2 | /** |
ba87f080 | * @file |
89c9ff50 | * miscellaneous math routines and tables |
c11c2bc2 | */ |
2ed6f399 | #include <stdint.h> #include <limits.h> |
d5c62122 | |
c11c2bc2 | #include "mathematics.h" |
a18eff49 | #include "libavutil/common.h" |
2f23a8ab | #include "avassert.h" |
d5c62122 | #include "version.h" |
c11c2bc2 | |
d5c62122 | #if FF_API_AV_REVERSE |
de69aedf | const uint8_t av_reverse[256] = { |
91cc5d37 | 0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0, 0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8, 0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4, 0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC, 0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2, 0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA, 0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6, 0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE, 0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1, 0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9, 0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5, 0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD, 0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3, 0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB, 0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7, 0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF, }; |
d5c62122 | #endif |
91cc5d37 | |
de69aedf | int64_t av_gcd(int64_t a, int64_t b) { if (b) return av_gcd(b, a % b); else return a; |
c11c2bc2 | } |
de69aedf | int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd) { int64_t r = 0; |
2f23a8ab | av_assert2(c > 0); av_assert2(b >=0); |
740e7408 | av_assert2((unsigned)(rnd&~AV_ROUND_PASS_MINMAX)<=5 && (rnd&~AV_ROUND_PASS_MINMAX)!=4); |
3929c174 | if (c <= 0 || b < 0 || !((unsigned)(rnd&~AV_ROUND_PASS_MINMAX)<=5 && (rnd&~AV_ROUND_PASS_MINMAX)!=4)) |
94a417ac | return INT64_MIN; |
115329f1 | |
740e7408 | if (rnd & AV_ROUND_PASS_MINMAX) { if (a == INT64_MIN || a == INT64_MAX) return a; rnd -= AV_ROUND_PASS_MINMAX; } |
115329f1 | |
de69aedf | if (a < 0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd >> 1) & 1)); |
115329f1 | |
de69aedf | if (rnd == AV_ROUND_NEAR_INF) r = c / 2; else if (rnd & 1) r = c - 1; |
c11c2bc2 | |
de69aedf | if (b <= INT_MAX && c <= INT_MAX) { if (a <= INT_MAX) return (a * b + r) / c; |
c11c2bc2 | else |
de69aedf | return a / c * b + (a % c * b + r) / c; } else { |
fdb3a341 | #if 1 |
de69aedf | 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; |
fdb3a341 | int i; |
de69aedf | a0 = a0 * b0 + t1a; a1 = a1 * b1 + (t1 >> 32) + (a0 < t1a); |
fdb3a341 | a0 += r; |
de69aedf | a1 += a0 < r; |
115329f1 | |
de69aedf | for (i = 63; i >= 0; i--) { a1 += a1 + ((a0 >> i) & 1); t1 += t1; if (c <= a1) { |
fdb3a341 | a1 -= c; t1++; } } return t1; } #else AVInteger ai; |
de69aedf | ai = av_mul_i(av_int2i(a), av_int2i(b)); ai = av_add_i(ai, av_int2i(r)); |
115329f1 | |
fdb3a341 | return av_i2int(av_div_i(ai, av_int2i(c))); } #endif |
c11c2bc2 | } |
de69aedf | int64_t av_rescale(int64_t a, int64_t b, int64_t c) { |
c11c2bc2 | return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF); } |
0b42a938 | int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq, enum AVRounding rnd) { |
de69aedf | int64_t b = bq.num * (int64_t)cq.den; int64_t c = cq.num * (int64_t)bq.den; |
0b42a938 | 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); |
c11c2bc2 | } |
f0cb505a | |
de69aedf | 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; |
bc4b424d | if ((FFABS(ts_a)|a|FFABS(ts_b)|b) <= INT_MAX) |
a18eff49 | return (ts_a*a > ts_b*b) - (ts_a*a < ts_b*b); |
de69aedf | 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; |
78b01823 | return 0; } |
de69aedf | 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; |
65db0587 | return c; } |
8766ad9e | 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); } |
b317f945 | int64_t av_add_stable(AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t inc) { |
e9add0d8 | int64_t m, d; |
4956d0e5 | if (inc != 1) inc_tb = av_mul_q(inc_tb, (AVRational) {inc, 1}); |
b317f945 | |
e9add0d8 | 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; |
666e29fe | if (m < d) |
b317f945 | return ts; |
666e29fe | { |
5b7519fb | 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); |
b317f945 | } } |