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
26 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
30 uint64_t exp16_table[21]={
55 // 16.16 fixpoint exp()
56 static unsigned int exp16(unsigned int a){
62 out= (out*exp16_table[i] + (1<<15))>>16;
69 // 16.16 fixpoint log()
70 static int64_t log16(uint64_t a){
75 return -log16((1LL<<32) / a);
79 int64_t b= exp16_table[i];
80 if(a<(b<<16)) continue;
82 a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
87 static uint64_t int_sqrt(uint64_t a)
94 uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
103 int main(int argc,char* argv[]){
108 uint8_t buf[2][SIZE];
110 int len= argc<4 ? 1 : atoi(argv[3]);
111 int64_t max= (1<<(8*len))-1;
112 int shift= argc<5 ? 0 : atoi(argv[4]);
113 int skip_bytes = argc<6 ? 0 : atoi(argv[5]);
118 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
119 printf("For WAV files use the following:\n");
120 printf("./tiny_psnr file1.wav file2.wav 2 0 44 to skip the header.\n");
124 f[0]= fopen(argv[1], "rb");
125 f[1]= fopen(argv[2], "rb");
127 fprintf(stderr, "Could not open input files.\n");
130 fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET);
132 fseek(f[0],skip_bytes,SEEK_CUR);
133 fseek(f[1],skip_bytes,SEEK_CUR);
136 int s0= fread(buf[0], 1, SIZE, f[0]);
137 int s1= fread(buf[1], 1, SIZE, f[1]);
139 for(j=0; j<FFMIN(s0,s1); j++){
140 int64_t a= buf[0][j];
141 int64_t b= buf[1][j];
143 a= (int16_t)(a | (buf[0][++j]<<8));
144 b= (int16_t)(b | (buf[1][ j]<<8));
146 sse += (a-b) * (a-b);
154 i= FFMIN(size0,size1)/len;
156 dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
158 psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1LL<<31)) / (1LL<<32);
160 psnr= 1000*F-1; //floating point free infinity :)
162 printf("stddev:%5d.%02d PSNR:%3d.%02d bytes:%9d/%9d\n",
163 (int)(dev/F), (int)(dev%F),
164 (int)(psnr/F), (int)(psnr%F),