tiny_psnr: switch f32 handling to floating point
[libav.git] / tests / tiny_psnr.c
1 /*
2 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of Libav.
5 *
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.
10 *
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.
15 *
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
19 */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <inttypes.h>
25 #include <assert.h>
26 #include <math.h>
27 #include <float.h>
28
29 #include "libavutil/intfloat.h"
30 #include "libavutil/intreadwrite.h"
31
32 #define FFMIN(a, b) ((a) > (b) ? (b) : (a))
33 #define F 100
34 #define SIZE 2048
35
36 uint64_t exp16_table[21] = {
37 65537,
38 65538,
39 65540,
40 65544,
41 65552,
42 65568,
43 65600,
44 65664,
45 65793,
46 66050,
47 66568,
48 67616,
49 69763,
50 74262,
51 84150,
52 108051,
53 178145,
54 484249,
55 3578144,
56 195360063,
57 582360139072LL,
58 };
59
60 // 16.16 fixpoint log()
61 static int64_t log16(uint64_t a)
62 {
63 int i;
64 int out = 0;
65
66 if (a < 1 << 16)
67 return -log16((1LL << 32) / a);
68 a <<= 16;
69
70 for (i = 20; i >= 0; i--) {
71 int64_t b = exp16_table[i];
72 if (a < (b << 16))
73 continue;
74 out |= 1 << i;
75 a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b;
76 }
77 return out;
78 }
79
80 static uint64_t int_sqrt(uint64_t a)
81 {
82 uint64_t ret = 0;
83 uint64_t ret_sq = 0;
84 int s;
85
86 for (s = 31; s >= 0; s--) {
87 uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2;
88 if (b <= a) {
89 ret_sq = b;
90 ret += 1ULL << s;
91 }
92 }
93 return ret;
94 }
95
96 static int16_t get_s16l(uint8_t *p)
97 {
98 union {
99 uint16_t u;
100 int16_t s;
101 } v;
102 v.u = p[0] | p[1] << 8;
103 return v.s;
104 }
105
106 static float get_f32l(uint8_t *p)
107 {
108 union av_intfloat32 v;
109 v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
110 return v.f;
111 }
112
113 static double get_f64l(uint8_t *p)
114 {
115 return av_int2double(AV_RL64(p));
116 }
117
118 int main(int argc, char *argv[])
119 {
120 int i, j;
121 uint64_t sse = 0;
122 double sse_d = 0.0;
123 FILE *f[2];
124 uint8_t buf[2][SIZE];
125 int len = 1;
126 int64_t max;
127 int shift = argc < 5 ? 0 : atoi(argv[4]);
128 int skip_bytes = argc < 6 ? 0 : atoi(argv[5]);
129 int size0 = 0;
130 int size1 = 0;
131 uint64_t maxdist = 0;
132 double maxdist_d = 0.0;
133
134 if (argc < 3) {
135 printf("tiny_psnr <file1> <file2> [<elem size> [<shift> [<skip bytes>]]]\n");
136 printf("WAV headers are skipped automatically.\n");
137 return 1;
138 }
139
140 if (argc > 3) {
141 if (!strcmp(argv[3], "u8")) {
142 len = 1;
143 } else if (!strcmp(argv[3], "s16")) {
144 len = 2;
145 } else if (!strcmp(argv[3], "f32")) {
146 len = 4;
147 } else if (!strcmp(argv[3], "f64")) {
148 len = 8;
149 } else {
150 char *end;
151 len = strtol(argv[3], &end, 0);
152 if (*end || len < 1 || len > 2) {
153 fprintf(stderr, "Unsupported sample format: %s\n", argv[3]);
154 return 1;
155 }
156 }
157 }
158
159 max = (1LL << (8 * len)) - 1;
160
161 f[0] = fopen(argv[1], "rb");
162 f[1] = fopen(argv[2], "rb");
163 if (!f[0] || !f[1]) {
164 fprintf(stderr, "Could not open input files.\n");
165 return 1;
166 }
167
168 for (i = 0; i < 2; i++) {
169 uint8_t *p = buf[i];
170 if (fread(p, 1, 12, f[i]) != 12)
171 return 1;
172 if (!memcmp(p, "RIFF", 4) &&
173 !memcmp(p + 8, "WAVE", 4)) {
174 if (fread(p, 1, 8, f[i]) != 8)
175 return 1;
176 while (memcmp(p, "data", 4)) {
177 int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24;
178 fseek(f[i], s, SEEK_CUR);
179 if (fread(p, 1, 8, f[i]) != 8)
180 return 1;
181 }
182 } else {
183 fseek(f[i], -12, SEEK_CUR);
184 }
185 }
186
187 fseek(f[shift < 0], abs(shift), SEEK_CUR);
188
189 fseek(f[0], skip_bytes, SEEK_CUR);
190 fseek(f[1], skip_bytes, SEEK_CUR);
191
192 for (;;) {
193 int s0 = fread(buf[0], 1, SIZE, f[0]);
194 int s1 = fread(buf[1], 1, SIZE, f[1]);
195
196 for (j = 0; j < FFMIN(s0, s1); j += len) {
197 switch (len) {
198 case 1:
199 case 2: {
200 int64_t a = buf[0][j];
201 int64_t b = buf[1][j];
202 int dist;
203 if (len == 2) {
204 a = get_s16l(buf[0] + j);
205 b = get_s16l(buf[1] + j);
206 } else {
207 a = buf[0][j];
208 b = buf[1][j];
209 }
210 sse += (a - b) * (a - b);
211 dist = abs(a - b);
212 if (dist > maxdist)
213 maxdist = dist;
214 break;
215 }
216 case 4:
217 case 8: {
218 double dist, a, b;
219 if (len == 8) {
220 a = get_f64l(buf[0] + j);
221 b = get_f64l(buf[1] + j);
222 } else {
223 a = get_f32l(buf[0] + j);
224 b = get_f32l(buf[1] + j);
225 }
226 dist = fabs(a - b);
227 sse_d += (a - b) * (a - b);
228 if (dist > maxdist_d)
229 maxdist_d = dist;
230 break;
231 }
232 }
233 }
234 size0 += s0;
235 size1 += s1;
236 if (s0 + s1 <= 0)
237 break;
238 }
239
240 i = FFMIN(size0, size1) / len;
241 if (!i)
242 i = 1;
243 switch (len) {
244 case 1:
245 case 2: {
246 uint64_t psnr;
247 uint64_t dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i);
248 if (sse)
249 psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) *
250 284619LL * F + (1LL << 31)) / (1LL << 32);
251 else
252 psnr = 1000 * F - 1; // floating point free infinity :)
253
254 printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5"PRIu64" bytes:%9d/%9d\n",
255 (int)(dev / F), (int)(dev % F),
256 (int)(psnr / F), (int)(psnr % F),
257 maxdist, size0, size1);
258 break;
259 }
260 case 4:
261 case 8: {
262 char psnr_str[64];
263 double dev = sqrt(sse_d / i);
264 uint64_t scale = (len == 4) ? (1ULL << 24) : (1ULL << 32);
265
266 if (sse_d) {
267 double psnr = 2 * log(DBL_MAX) - log(i / sse_d);
268 snprintf(psnr_str, sizeof(psnr_str), "%5.02f", psnr);
269 } else
270 snprintf(psnr_str, sizeof(psnr_str), "inf");
271
272 maxdist = maxdist_d * scale;
273
274 printf("stddev:%10.2f PSNR:%s MAXDIFF:%10"PRIu64" bytes:%9d/%9d\n",
275 dev * scale, psnr_str, maxdist, size0, size1);
276 break;
277 }
278 }
279 return 0;
280 }