2 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
31 uint64_t exp16_table[21]={
55 // 16.16 fixpoint log()
56 static int64_t log16(uint64_t a){
61 return -log16((1LL<<32) / a);
65 int64_t b= exp16_table[i];
66 if(a<(b<<16)) continue;
68 a = ((a/b)<<16) + (((a%b)<<16) + b/2)/b;
73 static uint64_t int_sqrt(uint64_t a)
80 uint64_t b= ret_sq + (1ULL<<(s*2)) + (ret<<s)*2;
89 int main(int argc,char* argv[]){
96 int len= argc<4 ? 1 : atoi(argv[3]);
97 int64_t max= (1<<(8*len))-1;
98 int shift= argc<5 ? 0 : atoi(argv[4]);
99 int skip_bytes = argc<6 ? 0 : atoi(argv[5]);
105 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
106 printf("WAV headers are skipped automatically.\n");
110 f[0]= fopen(argv[1], "rb");
111 f[1]= fopen(argv[2], "rb");
113 fprintf(stderr, "Could not open input files.\n");
117 for (i = 0; i < 2; i++) {
119 if (fread(p, 1, 12, f[i]) != 12)
121 if (!memcmp(p, "RIFF", 4) &&
122 !memcmp(p+8, "WAVE", 4)) {
123 if (fread(p, 1, 8, f[i]) != 8)
125 while (memcmp(p, "data", 4)) {
126 int s = p[4] | p[5]<<8 | p[6]<<16 | p[7]<<24;
127 fseek(f[i], s, SEEK_CUR);
128 if (fread(p, 1, 8, f[i]) != 8)
132 fseek(f[i], -12, SEEK_CUR);
136 fseek(f[shift<0], abs(shift), SEEK_CUR);
138 fseek(f[0],skip_bytes,SEEK_CUR);
139 fseek(f[1],skip_bytes,SEEK_CUR);
142 int s0= fread(buf[0], 1, SIZE, f[0]);
143 int s1= fread(buf[1], 1, SIZE, f[1]);
145 for(j=0; j<FFMIN(s0,s1); j++){
146 int64_t a= buf[0][j];
147 int64_t b= buf[1][j];
150 a= (int16_t)(a | (buf[0][++j]<<8));
151 b= (int16_t)(b | (buf[1][ j]<<8));
153 sse += (a-b) * (a-b);
155 if (dist > maxdist) maxdist = dist;
163 i= FFMIN(size0,size1)/len;
165 dev= int_sqrt( ((sse/i)*F*F) + (((sse%i)*F*F) + i/2)/i );
167 psnr= ((2*log16(max<<16) + log16(i) - log16(sse))*284619LL*F + (1LL<<31)) / (1LL<<32);
169 psnr= 1000*F-1; //floating point free infinity :)
171 printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5d bytes:%9d/%9d\n",
172 (int)(dev/F), (int)(dev%F),
173 (int)(psnr/F), (int)(psnr%F),