75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
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/*
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <inttypes.h>
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#define F 100
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#define SIZE 2048
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static uint64_t int_sqrt(uint64_t a)
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{
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uint64_t ret=0;
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int s;
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uint64_t ret_sq=0;
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for(s=31; s>=0; s--){
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uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
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if(b<=a){
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ret_sq=b;
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ret+= 1ULL<<s;
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}
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}
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return ret;
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}
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int main(int argc,char* argv[]){
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int i, j;
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uint64_t sse=0;
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uint64_t dev;
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FILE *f[2];
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uint8_t buf[2][SIZE];
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if(argc!=3){
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printf("tiny_psnr <file1> <file2>\n");
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return -1;
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}
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f[0]= fopen(argv[1], "r");
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f[1]= fopen(argv[2], "r");
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for(i=0;;){
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if( fread(buf[0], SIZE, 1, f[0]) != 1) break;
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if( fread(buf[1], SIZE, 1, f[1]) != 1) break;
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for(j=0; j<SIZE; i++,j++){
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const int a= buf[0][j];
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const int b= buf[1][j];
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sse += (a-b) * (a-b);
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}
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}
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dev= int_sqrt((sse*F*F)/i);
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//FIXME someone should write a integer fixpoint log() function for bitexact PSNR scores ...
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printf("stddev:%3d.%02d bytes:%d\n", (int)(dev/F), (int)(dev%F), i);
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return 0;
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}
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