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
28 #include "libavutil/intfloat.h"
29 #include "libavutil/intreadwrite.h"
31 #define FFMIN(a, b) ((a) > (b) ? (b) : (a))
35 uint64_t exp16_table[21] = {
59 // 16.16 fixpoint log()
60 static int64_t log16(uint64_t a)
66 return -log16((1LL << 32) / a);
69 for (i = 20; i >= 0; i--) {
70 int64_t b = exp16_table[i];
74 a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b;
79 static uint64_t int_sqrt(uint64_t a)
85 for (s = 31; s >= 0; s--) {
86 uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2;
95 static int16_t get_s16l(uint8_t *p)
101 v.u = p[0] | p[1] << 8;
105 static float get_f32l(uint8_t *p)
107 union av_intfloat32 v;
108 v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
112 static double get_f64l(uint8_t *p)
114 return av_int2double(AV_RL64(p));
117 int main(int argc, char *argv[])
123 uint8_t buf[2][SIZE];
126 int shift = argc < 5 ? 0 : atoi(argv[4]);
127 int skip_bytes = argc < 6 ? 0 : atoi(argv[5]);
130 uint64_t maxdist = 0;
131 double maxdist_d = 0.0;
134 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
135 printf("WAV headers are skipped automatically.\n");
140 if (!strcmp(argv[3], "u8")) {
142 } else if (!strcmp(argv[3], "s16")) {
144 } else if (!strcmp(argv[3], "f32")) {
146 } else if (!strcmp(argv[3], "f64")) {
150 len = strtol(argv[3], &end, 0);
151 if (*end || len < 1 || len > 2) {
152 fprintf(stderr, "Unsupported sample format: %s\n", argv[3]);
158 max = (1LL << (8 * len)) - 1;
160 f[0] = fopen(argv[1], "rb");
161 f[1] = fopen(argv[2], "rb");
162 if (!f[0] || !f[1]) {
163 fprintf(stderr, "Could not open input files.\n");
167 for (i = 0; i < 2; i++) {
169 if (fread(p, 1, 12, f[i]) != 12)
171 if (!memcmp(p, "RIFF", 4) &&
172 !memcmp(p + 8, "WAVE", 4)) {
173 if (fread(p, 1, 8, f[i]) != 8)
175 while (memcmp(p, "data", 4)) {
176 int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24;
177 fseek(f[i], s, SEEK_CUR);
178 if (fread(p, 1, 8, f[i]) != 8)
182 fseek(f[i], -12, SEEK_CUR);
186 fseek(f[shift < 0], abs(shift), SEEK_CUR);
188 fseek(f[0], skip_bytes, SEEK_CUR);
189 fseek(f[1], skip_bytes, SEEK_CUR);
192 int s0 = fread(buf[0], 1, SIZE, f[0]);
193 int s1 = fread(buf[1], 1, SIZE, f[1]);
195 for (j = 0; j < FFMIN(s0, s1); j += len) {
199 int64_t a = buf[0][j];
200 int64_t b = buf[1][j];
203 a = get_s16l(buf[0] + j);
204 b = get_s16l(buf[1] + j);
209 sse += (a - b) * (a - b);
219 a = get_f64l(buf[0] + j);
220 b = get_f64l(buf[1] + j);
222 a = get_f32l(buf[0] + j);
223 b = get_f32l(buf[1] + j);
226 sse_d += (a - b) * (a - b);
227 if (dist > maxdist_d)
239 i = FFMIN(size0, size1) / len;
246 uint64_t dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i);
248 psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) *
249 284619LL * F + (1LL << 31)) / (1LL << 32);
251 psnr = 1000 * F - 1; // floating point free infinity :)
253 printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5"PRIu64" bytes:%9"PRIu64"/%9"PRIu64"\n",
254 (int)(dev / F), (int)(dev % F),
255 (int)(psnr / F), (int)(psnr % F),
256 maxdist, size0, size1);
262 double dev = sqrt(sse_d / i);
263 uint64_t scale = (len == 4) ? (1ULL << 24) : (1ULL << 32);
266 double psnr = 2 * log(DBL_MAX) - log(i / sse_d);
267 snprintf(psnr_str, sizeof(psnr_str), "%5.02f", psnr);
269 snprintf(psnr_str, sizeof(psnr_str), "inf");
271 maxdist = maxdist_d * scale;
273 printf("stddev:%10.2f PSNR:%s MAXDIFF:%10"PRIu64" bytes:%9"PRIu64"/%9"PRIu64"\n",
274 dev * scale, psnr_str, maxdist, size0, size1);