yading@11: /* yading@11: * Copyright (c) 2005-2012 Michael Niedermayer yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: /** yading@11: * @file yading@11: * miscellaneous math routines and tables yading@11: */ yading@11: yading@11: #include yading@11: #include yading@11: yading@11: #include "mathematics.h" yading@11: #include "libavutil/common.h" yading@11: #include "avassert.h" yading@11: #include "version.h" yading@11: yading@11: #if FF_API_AV_REVERSE yading@11: const uint8_t av_reverse[256]={ yading@11: 0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0, yading@11: 0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8, yading@11: 0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4, yading@11: 0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC, yading@11: 0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2, yading@11: 0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA, yading@11: 0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6, yading@11: 0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE, yading@11: 0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1, yading@11: 0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9, yading@11: 0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5, yading@11: 0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD, yading@11: 0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3, yading@11: 0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB, yading@11: 0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7, yading@11: 0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF, yading@11: }; yading@11: #endif yading@11: yading@11: int64_t av_gcd(int64_t a, int64_t b){ yading@11: if(b) return av_gcd(b, a%b); yading@11: else return a; yading@11: } yading@11: yading@11: int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){ yading@11: int64_t r=0; yading@11: av_assert2(c > 0); yading@11: av_assert2(b >=0); yading@11: av_assert2((unsigned)(rnd&~AV_ROUND_PASS_MINMAX)<=5 && (rnd&~AV_ROUND_PASS_MINMAX)!=4); yading@11: yading@11: if (rnd & AV_ROUND_PASS_MINMAX) { yading@11: if (a == INT64_MIN || a == INT64_MAX) yading@11: return a; yading@11: rnd -= AV_ROUND_PASS_MINMAX; yading@11: } yading@11: yading@11: if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1)); yading@11: yading@11: if(rnd==AV_ROUND_NEAR_INF) r= c/2; yading@11: else if(rnd&1) r= c-1; yading@11: yading@11: if(b<=INT_MAX && c<=INT_MAX){ yading@11: if(a<=INT_MAX) yading@11: return (a * b + r)/c; yading@11: else yading@11: return a/c*b + (a%c*b + r)/c; yading@11: }else{ yading@11: #if 1 yading@11: uint64_t a0= a&0xFFFFFFFF; yading@11: uint64_t a1= a>>32; yading@11: uint64_t b0= b&0xFFFFFFFF; yading@11: uint64_t b1= b>>32; yading@11: uint64_t t1= a0*b1 + a1*b0; yading@11: uint64_t t1a= t1<<32; yading@11: int i; yading@11: yading@11: a0 = a0*b0 + t1a; yading@11: a1 = a1*b1 + (t1>>32) + (a0=0; i--){ yading@11: // int o= a1 & 0x8000000000000000ULL; yading@11: a1+= a1 + ((a0>>i)&1); yading@11: t1+=t1; yading@11: if(/*o || */c <= a1){ yading@11: a1 -= c; yading@11: t1++; yading@11: } yading@11: } yading@11: return t1; yading@11: } yading@11: #else yading@11: AVInteger ai; yading@11: ai= av_mul_i(av_int2i(a), av_int2i(b)); yading@11: ai= av_add_i(ai, av_int2i(r)); yading@11: yading@11: return av_i2int(av_div_i(ai, av_int2i(c))); yading@11: } yading@11: #endif yading@11: } yading@11: yading@11: int64_t av_rescale(int64_t a, int64_t b, int64_t c){ yading@11: return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF); yading@11: } yading@11: yading@11: int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq, yading@11: enum AVRounding rnd) yading@11: { yading@11: int64_t b= bq.num * (int64_t)cq.den; yading@11: int64_t c= cq.num * (int64_t)bq.den; yading@11: return av_rescale_rnd(a, b, c, rnd); yading@11: } yading@11: yading@11: int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) yading@11: { yading@11: return av_rescale_q_rnd(a, bq, cq, AV_ROUND_NEAR_INF); yading@11: } yading@11: yading@11: int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b){ yading@11: int64_t a= tb_a.num * (int64_t)tb_b.den; yading@11: int64_t b= tb_b.num * (int64_t)tb_a.den; yading@11: if((FFABS(ts_a)|a|FFABS(ts_b)|b)<=INT_MAX) yading@11: return (ts_a*a > ts_b*b) - (ts_a*a < ts_b*b); yading@11: if (av_rescale_rnd(ts_a, a, b, AV_ROUND_DOWN) < ts_b) return -1; yading@11: if (av_rescale_rnd(ts_b, b, a, AV_ROUND_DOWN) < ts_a) return 1; yading@11: return 0; yading@11: } yading@11: yading@11: int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod){ yading@11: int64_t c= (a-b) & (mod-1); yading@11: if(c > (mod>>1)) yading@11: c-= mod; yading@11: return c; yading@11: } yading@11: yading@11: int64_t av_rescale_delta(AVRational in_tb, int64_t in_ts, AVRational fs_tb, int duration, int64_t *last, AVRational out_tb){ yading@11: int64_t a, b, this; yading@11: yading@11: av_assert0(in_ts != AV_NOPTS_VALUE); yading@11: av_assert0(duration >= 0); yading@11: yading@11: if (*last == AV_NOPTS_VALUE || !duration || in_tb.num*(int64_t)out_tb.den <= out_tb.num*(int64_t)in_tb.den) { yading@11: simple_round: yading@11: *last = av_rescale_q(in_ts, in_tb, fs_tb) + duration; yading@11: return av_rescale_q(in_ts, in_tb, out_tb); yading@11: } yading@11: yading@11: a = av_rescale_q_rnd(2*in_ts-1, in_tb, fs_tb, AV_ROUND_DOWN) >>1; yading@11: b = (av_rescale_q_rnd(2*in_ts+1, in_tb, fs_tb, AV_ROUND_UP )+1)>>1; yading@11: if (*last < 2*a - b || *last > 2*b - a) yading@11: goto simple_round; yading@11: yading@11: this = av_clip64(*last, a, b); yading@11: *last = this + duration; yading@11: yading@11: return av_rescale_q(this, fs_tb, out_tb); yading@11: }