2 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 uint64_t exp16_table[21]={
54 // 16.16 fixpoint exp()
55 static unsigned int exp16(unsigned int a){
61 out= (out*exp16_table[i] + (1<<15))>>16;
68 // 16.16 fixpoint log()
69 static int64_t log16(uint64_t a){
74 return -log16((1LL<<32) / a);
78 int64_t b= exp16_table[i];
79 if(a<(b<<16)) continue;
81 a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
86 static uint64_t int_sqrt(uint64_t a)
93 uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
102 int main(int argc,char* argv[]){
107 uint8_t buf[2][SIZE];
109 int len= argc<4 ? 1 : atoi(argv[3]);
110 int64_t max= (1<<(8*len))-1;
111 int shift= argc<5 ? 0 : atoi(argv[4]);
112 int skip_bytes = argc<6 ? 0 : atoi(argv[5]);
115 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
116 printf("for wav files use the following:\n");
117 printf("./tiny_psnr file1.wav file2.wav 2 0 44 to skip the header.\n");
121 f[0]= fopen(argv[1], "rb");
122 f[1]= fopen(argv[2], "rb");
123 fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET);
125 fseek(f[0],skip_bytes,SEEK_CUR);
126 fseek(f[1],skip_bytes,SEEK_CUR);
129 if( fread(buf[0], SIZE, 1, f[0]) != 1) break;
130 if( fread(buf[1], SIZE, 1, f[1]) != 1) break;
132 for(j=0; j<SIZE; i++,j++){
133 int64_t a= buf[0][j];
134 int64_t b= buf[1][j];
136 a= (int16_t)(a | (buf[0][++j]<<8));
137 b= (int16_t)(b | (buf[1][ j]<<8));
139 sse += (a-b) * (a-b);
144 dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
146 psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1<<31)) / (1LL<<32);
148 psnr= 100*F-1; //floating point free infinity :)
150 printf("stddev:%3d.%02d PSNR:%2d.%02d bytes:%d\n",
151 (int)(dev/F), (int)(dev%F),
152 (int)(psnr/F), (int)(psnr%F),