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/*
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/
#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <inttypes.h> |
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#include <assert.h> |
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|
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#define FFMIN(a,b) ((a) > (b) ? (b) : (a)) |
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#define F 100
#define SIZE 2048
|
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uint64_t exp16_table[21]={ |
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65537,
65538,
65540,
65544,
65552,
65568,
65600,
65664,
65793,
66050,
66568,
67616,
69763,
74262,
84150,
108051,
178145,
484249,
3578144,
195360063, |
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582360139072LL, |
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}; |
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#if 0 |
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// 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;
} |
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|
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return out;
} |
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#endif
|
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// 16.16 fixpoint log() |
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static int64_t log16(uint64_t a){ |
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int i;
int out=0; |
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if(a < 1<<16)
return -log16((1LL<<32) / a); |
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a<<=16; |
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|
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for(i=20;i>=0;i--){ |
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int64_t b= exp16_table[i];
if(a<(b<<16)) continue; |
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out |= 1<<i; |
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a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b; |
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}
return out;
}
|
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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]; |
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uint64_t psnr; |
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int len= argc<4 ? 1 : atoi(argv[3]); |
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int64_t max= (1<<(8*len))-1; |
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int shift= argc<5 ? 0 : atoi(argv[4]); |
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int skip_bytes = argc<6 ? 0 : atoi(argv[5]); |
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int size0=0;
int size1=0; |
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int maxdist = 0; |
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|
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if(argc<3){ |
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printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n"); |
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printf("WAV headers are skipped automatically.\n"); |
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return 1; |
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} |
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|
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f[0]= fopen(argv[1], "rb");
f[1]= fopen(argv[2], "rb"); |
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if(!f[0] || !f[1]){ |
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fprintf(stderr, "Could not open input files.\n"); |
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return 1; |
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} |
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for (i = 0; i < 2; i++) {
uint8_t *p = buf[i]; |
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if (fread(p, 1, 12, f[i]) != 12)
return 1; |
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if (!memcmp(p, "RIFF", 4) &&
!memcmp(p+8, "WAVE", 4)) { |
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if (fread(p, 1, 8, f[i]) != 8)
return 1; |
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while (memcmp(p, "data", 4)) {
int s = p[4] | p[5]<<8 | p[6]<<16 | p[7]<<24;
fseek(f[i], s, SEEK_CUR); |
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if (fread(p, 1, 8, f[i]) != 8)
return 1; |
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}
} else {
fseek(f[i], -12, SEEK_CUR);
}
}
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fseek(f[shift<0], abs(shift), SEEK_CUR); |
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|
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fseek(f[0],skip_bytes,SEEK_CUR);
fseek(f[1],skip_bytes,SEEK_CUR);
|
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for(;;){
int s0= fread(buf[0], 1, SIZE, f[0]);
int s1= fread(buf[1], 1, SIZE, f[1]); |
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|
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for(j=0; j<FFMIN(s0,s1); j++){ |
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int64_t a= buf[0][j];
int64_t b= buf[1][j]; |
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int dist; |
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if(len==2){
a= (int16_t)(a | (buf[0][++j]<<8));
b= (int16_t)(b | (buf[1][ j]<<8));
} |
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sse += (a-b) * (a-b); |
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dist = abs(a-b);
if (dist > maxdist) maxdist = dist; |
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} |
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size0 += s0;
size1 += s1;
if(s0+s1<=0)
break; |
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} |
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|
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i= FFMIN(size0,size1)/len; |
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if(!i) i=1; |
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dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i ); |
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if(sse) |
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psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1LL<<31)) / (1LL<<32); |
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else |
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psnr= 1000*F-1; //floating point free infinity :) |
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|
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printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5d bytes:%9d/%9d\n", |
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(int)(dev/F), (int)(dev%F), |
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(int)(psnr/F), (int)(psnr%F), |
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maxdist, |
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size0, size1); |
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return 0;
} |
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|