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
27 #define FFMIN(a, b) ((a) > (b) ? (b) : (a))
31 uint64_t exp16_table[21] = {
56 // 16.16 fixpoint exp()
57 static unsigned int exp16(unsigned int a){
63 out= (out*exp16_table[i] + (1<<15))>>16;
70 // 16.16 fixpoint log()
71 static int64_t log16(uint64_t a)
77 return -log16((1LL << 32) / a);
80 for (i = 20; i >= 0; i--) {
81 int64_t b = exp16_table[i];
85 a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b;
90 static uint64_t int_sqrt(uint64_t a)
96 for (s = 31; s >= 0; s--) {
97 uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2;
106 int main(int argc, char *argv[])
112 uint8_t buf[2][SIZE];
114 int len = argc < 4 ? 1 : atoi(argv[3]);
115 int64_t max = (1 << (8 * len)) - 1;
116 int shift = argc < 5 ? 0 : atoi(argv[4]);
117 int skip_bytes = argc < 6 ? 0 : atoi(argv[5]);
123 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
124 printf("WAV headers are skipped automatically.\n");
128 f[0] = fopen(argv[1], "rb");
129 f[1] = fopen(argv[2], "rb");
130 if (!f[0] || !f[1]) {
131 fprintf(stderr, "Could not open input files.\n");
135 for (i = 0; i < 2; i++) {
137 if (fread(p, 1, 12, f[i]) != 12)
139 if (!memcmp(p, "RIFF", 4) &&
140 !memcmp(p + 8, "WAVE", 4)) {
141 if (fread(p, 1, 8, f[i]) != 8)
143 while (memcmp(p, "data", 4)) {
144 int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24;
145 fseek(f[i], s, SEEK_CUR);
146 if (fread(p, 1, 8, f[i]) != 8)
150 fseek(f[i], -12, SEEK_CUR);
154 fseek(f[shift < 0], abs(shift), SEEK_CUR);
156 fseek(f[0], skip_bytes, SEEK_CUR);
157 fseek(f[1], skip_bytes, SEEK_CUR);
160 int s0 = fread(buf[0], 1, SIZE, f[0]);
161 int s1 = fread(buf[1], 1, SIZE, f[1]);
163 for (j = 0; j < FFMIN(s0, s1); j++) {
164 int64_t a = buf[0][j];
165 int64_t b = buf[1][j];
168 a = (int16_t)(a | (buf[0][++j] << 8));
169 b = (int16_t)(b | (buf[1][ j] << 8));
171 sse += (a - b) * (a - b);
182 i = FFMIN(size0, size1) / len;
185 dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i);
187 psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) *
188 284619LL * F + (1LL << 31)) / (1LL << 32);
190 psnr = 1000 * F - 1; // floating point free infinity :)
192 printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5d bytes:%9d/%9d\n",
193 (int)(dev / F), (int)(dev % F),
194 (int)(psnr / F), (int)(psnr % F),
195 maxdist, size0, size1);