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Code Issues Releases Activity

use AVInteger in av_rescale() so it can finally do 64*64/64 instead of just 64*32/32

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Originally committed as revision 3106 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-05-04 02:58:30 +00:00
parent 29adde838c
commit 4c263142c5
2 changed files with 17 additions and 13 deletions
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4
libavcodec/avcodec.h
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@ -17,7 +17,7 @@ extern "C" {
#define FFMPEG_VERSION_INT 0x000408
#define FFMPEG_VERSION "0.4.8"
#define LIBAVCODEC_BUILD 4711
#define LIBAVCODEC_BUILD 4712
#define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
#define LIBAVCODEC_VERSION FFMPEG_VERSION
@ -1986,7 +1986,7 @@ int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max)
* rescale a 64bit integer.
* a simple a*b/c isnt possible as it can overflow
*/
int64_t av_rescale(int64_t a, int b, int c);
int64_t av_rescale(int64_t a, int64_t b, int64_t c);
/**

24
libavcodec/utils.c
View File

@ -27,7 +27,9 @@
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "integer.h"
#include <stdarg.h>
#include <limits.h>
static void avcodec_default_free_buffers(AVCodecContext *s);
@ -816,23 +818,25 @@ int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max)
return exact;
}
int64_t av_rescale(int64_t a, int b, int c){
uint64_t h, l;
int64_t av_rescale(int64_t a, int64_t b, int64_t c){
AVInteger ai, ci;
assert(c > 0);
assert(b >=0);
if(a<0) return -av_rescale(-a, b, c);
h= a>>32;
if(h==0) return a*b/c;
if(b<=INT_MAX && c<=INT_MAX){
if(a<=INT_MAX)
return (a * b + c/2)/c;
else
return a/c*b + (a%c*b + c/2)/c;
}
l= a&0xFFFFFFFF;
l *= b;
h *= b;
ai= av_mul_i(av_int2i(a), av_int2i(b));
ci= av_int2i(c);
ai= av_add_i(ai, av_shr_i(ci,1));
l += (h%c)<<32;
return ((h/c)<<32) + l/c;
return av_i2int(av_div_i(ai, ci));
}
/* av_log API */