mirror of https://git.ffmpeg.org/ffmpeg.git
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
|
|
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <inttypes.h>
|
|
|
|
#define F 100
|
|
#define SIZE 2048
|
|
|
|
static uint64_t int_sqrt(uint64_t a)
|
|
{
|
|
uint64_t ret=0;
|
|
int s;
|
|
uint64_t ret_sq=0;
|
|
|
|
for(s=31; s>=0; s--){
|
|
uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
|
|
if(b<=a){
|
|
ret_sq=b;
|
|
ret+= 1ULL<<s;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int main(int argc,char* argv[]){
|
|
int i, j;
|
|
uint64_t sse=0;
|
|
uint64_t dev;
|
|
FILE *f[2];
|
|
uint8_t buf[2][SIZE];
|
|
|
|
if(argc!=3){
|
|
printf("tiny_psnr <file1> <file2>\n");
|
|
return -1;
|
|
}
|
|
|
|
f[0]= fopen(argv[1], "r");
|
|
f[1]= fopen(argv[2], "r");
|
|
|
|
for(i=0;;){
|
|
if( fread(buf[0], SIZE, 1, f[0]) != 1) break;
|
|
if( fread(buf[1], SIZE, 1, f[1]) != 1) break;
|
|
|
|
for(j=0; j<SIZE; i++,j++){
|
|
const int a= buf[0][j];
|
|
const int b= buf[1][j];
|
|
sse += (a-b) * (a-b);
|
|
}
|
|
}
|
|
|
|
dev= int_sqrt((sse*F*F)/i);
|
|
|
|
//FIXME someone should write a integer fixpoint log() function for bitexact PSNR scores ...
|
|
printf("stddev:%3d.%02d bytes:%d\n", (int)(dev/F), (int)(dev%F), i);
|
|
|
|
return 0;
|
|
}
|