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