155 lines
3.6 KiB
C
155 lines
3.6 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <inttypes.h>
|
|
#include <assert.h>
|
|
|
|
#define F 100
|
|
#define SIZE 2048
|
|
|
|
uint64_t exp16_table[21]={
|
|
65537,
|
|
65538,
|
|
65540,
|
|
65544,
|
|
65552,
|
|
65568,
|
|
65600,
|
|
65664,
|
|
65793,
|
|
66050,
|
|
66568,
|
|
67616,
|
|
69763,
|
|
74262,
|
|
84150,
|
|
108051,
|
|
178145,
|
|
484249,
|
|
3578144,
|
|
195360063,
|
|
582360139072LL,
|
|
};
|
|
#if 1
|
|
// 16.16 fixpoint exp()
|
|
static unsigned int exp16(unsigned int a){
|
|
int i;
|
|
int out= 1<<16;
|
|
|
|
for(i=19;i>=0;i--){
|
|
if(a&(1<<i))
|
|
out= (out*exp16_table[i] + (1<<15))>>16;
|
|
}
|
|
|
|
return out;
|
|
}
|
|
// 16.16 fixpoint log()
|
|
static int64_t log16(uint64_t a){
|
|
int i;
|
|
int out=0;
|
|
|
|
if(a < 1<<16)
|
|
return -log16((1LL<<32) / a);
|
|
a<<=16;
|
|
|
|
for(i=20;i>=0;i--){
|
|
int64_t b= exp16_table[i];
|
|
if(a<(b<<16)) continue;
|
|
out |= 1<<i;
|
|
a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
|
|
}
|
|
return out;
|
|
}
|
|
|
|
#endif
|
|
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];
|
|
uint64_t psnr;
|
|
int len= argc<4 ? 1 : atoi(argv[3]);
|
|
int64_t max= (1<<(8*len))-1;
|
|
int shift= argc<5 ? 0 : atoi(argv[4]);
|
|
int skip_bytes = argc<6 ? 0 : atoi(argv[5]);
|
|
|
|
if(argc<3){
|
|
printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
|
|
printf("for wav files use the following:\n");
|
|
printf("./tiny_psnr file1.wav file2.wav 2 0 44 to skip the header.\n");
|
|
return -1;
|
|
}
|
|
|
|
f[0]= fopen(argv[1], "rb");
|
|
f[1]= fopen(argv[2], "rb");
|
|
fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET);
|
|
|
|
fseek(f[0],skip_bytes,SEEK_CUR);
|
|
fseek(f[1],skip_bytes,SEEK_CUR);
|
|
|
|
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++){
|
|
int64_t a= buf[0][j];
|
|
int64_t b= buf[1][j];
|
|
if(len==2){
|
|
a= (int16_t)(a | (buf[0][++j]<<8));
|
|
b= (int16_t)(b | (buf[1][ j]<<8));
|
|
}
|
|
sse += (a-b) * (a-b);
|
|
}
|
|
}
|
|
|
|
if(!i) i=1;
|
|
dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
|
|
if(sse)
|
|
psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1<<31)) / (1LL<<32);
|
|
else
|
|
psnr= 100*F-1; //floating point free infinity :)
|
|
|
|
printf("stddev:%3d.%02d PSNR:%2d.%02d bytes:%d\n",
|
|
(int)(dev/F), (int)(dev%F),
|
|
(int)(psnr/F), (int)(psnr%F),
|
|
i*len);
|
|
return 0;
|
|
}
|
|
|
|
|