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mathematics: K&R formatting cosmetics

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This commit is contained in:
Luca Barbato 2014-05-01 14:54:06 +02:00
parent 3a177a9cca
commit de69aedf99
1 changed files with 53 additions and 42 deletions
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95
libavutil/mathematics.c
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@ -30,7 +30,7 @@
#include "version.h"
#if FF_API_AV_REVERSE
const uint8_t av_reverse[256]={
const uint8_t av_reverse[256] = {
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,
@ -50,47 +50,53 @@ const uint8_t av_reverse[256]={
};
#endif
int64_t av_gcd(int64_t a, int64_t b){
if(b) return av_gcd(b, a%b);
else return a;
int64_t av_gcd(int64_t a, int64_t b)
{
if (b)
return av_gcd(b, a % b);
else
return a;
}
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
int64_t r=0;
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
{
int64_t r = 0;
if (c <= 0 || b < 0 || rnd == 4 || rnd > 5)
return INT64_MIN;
if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1));
if (a < 0 && a != INT64_MIN)
return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd >> 1) & 1));
if(rnd==AV_ROUND_NEAR_INF) r= c/2;
else if(rnd&1) r= c-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;
if (b <= INT_MAX && c <= INT_MAX) {
if (a <= INT_MAX)
return (a * b + r) / c;
else
return a/c*b + (a%c*b + r)/c;
}else{
return a / c * b + (a % c * b + r) / c;
} 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;
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 = a0 * b0 + t1a;
a1 = a1 * b1 + (t1 >> 32) + (a0 < t1a);
a0 += r;
a1 += a0<r;
a1 += a0 < r;
for(i=63; i>=0; i--){
// int o= a1 & 0x8000000000000000ULL;
a1+= a1 + ((a0>>i)&1);
t1+=t1;
if(/*o || */c <= a1){
for (i = 63; i >= 0; i--) {
a1 += a1 + ((a0 >> i) & 1);
t1 += t1;
if (c <= a1) {
a1 -= c;
t1++;
}
@ -99,23 +105,24 @@ int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
}
#else
AVInteger ai;
ai= av_mul_i(av_int2i(a), av_int2i(b));
ai= av_add_i(ai, av_int2i(r));
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){
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;
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);
}
@ -124,17 +131,21 @@ 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 (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;
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 (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;
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;
}