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1 | /* |
2 | * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | */ | |
20 | ||
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <inttypes.h> | |
25 | #include <math.h> | |
26 | #include <float.h> | |
27 | #include <limits.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 | #if 0 | |
61 | // 16.16 fixpoint exp() | |
62 | static unsigned int exp16(unsigned int a){ | |
63 | int i; | |
64 | int out= 1<<16; | |
65 | ||
66 | for(i=19;i>=0;i--){ | |
67 | if(a&(1<<i)) | |
68 | out= (out*exp16_table[i] + (1<<15))>>16; | |
69 | } | |
70 | ||
71 | return out; | |
72 | } | |
73 | #endif | |
74 | ||
75 | // 16.16 fixpoint log() | |
76 | static int64_t log16(uint64_t a) | |
77 | { | |
78 | int i; | |
79 | int out = 0; | |
80 | ||
81 | if (a < 1 << 16) | |
82 | return -log16((1LL << 32) / a); | |
83 | a <<= 16; | |
84 | ||
85 | for (i = 20; i >= 0; i--) { | |
86 | int64_t b = exp16_table[i]; | |
87 | if (a < (b << 16)) | |
88 | continue; | |
89 | out |= 1 << i; | |
90 | a = ((a / b) << 16) + (((a % b) << 16) + b / 2) / b; | |
91 | } | |
92 | return out; | |
93 | } | |
94 | ||
95 | static uint64_t int_sqrt(uint64_t a) | |
96 | { | |
97 | uint64_t ret = 0; | |
98 | uint64_t ret_sq = 0; | |
99 | int s; | |
100 | ||
101 | for (s = 31; s >= 0; s--) { | |
102 | uint64_t b = ret_sq + (1ULL << (s * 2)) + (ret << s) * 2; | |
103 | if (b <= a) { | |
104 | ret_sq = b; | |
105 | ret += 1ULL << s; | |
106 | } | |
107 | } | |
108 | return ret; | |
109 | } | |
110 | ||
111 | static int16_t get_s16l(uint8_t *p) | |
112 | { | |
113 | union { | |
114 | uint16_t u; | |
115 | int16_t s; | |
116 | } v; | |
117 | v.u = p[0] | p[1] << 8; | |
118 | return v.s; | |
119 | } | |
120 | ||
121 | static float get_f32l(uint8_t *p) | |
122 | { | |
123 | union av_intfloat32 v; | |
124 | v.i = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24; | |
125 | return v.f; | |
126 | } | |
127 | ||
128 | static double get_f64l(uint8_t *p) | |
129 | { | |
130 | return av_int2double(AV_RL64(p)); | |
131 | } | |
132 | ||
133 | static int run_psnr(FILE *f[2], int len, int shift, int skip_bytes) | |
134 | { | |
135 | int i, j; | |
136 | uint64_t sse = 0; | |
137 | double sse_d = 0.0; | |
138 | uint8_t buf[2][SIZE]; | |
139 | int64_t max = (1LL << (8 * len)) - 1; | |
140 | int size0 = 0; | |
141 | int size1 = 0; | |
142 | uint64_t maxdist = 0; | |
143 | double maxdist_d = 0.0; | |
144 | int noseek; | |
145 | ||
146 | noseek = fseek(f[0], 0, SEEK_SET) || | |
147 | fseek(f[1], 0, SEEK_SET); | |
148 | ||
149 | if (!noseek) { | |
150 | for (i = 0; i < 2; i++) { | |
151 | uint8_t *p = buf[i]; | |
152 | if (fread(p, 1, 12, f[i]) != 12) | |
153 | return 1; | |
154 | if (!memcmp(p, "RIFF", 4) && | |
155 | !memcmp(p + 8, "WAVE", 4)) { | |
156 | if (fread(p, 1, 8, f[i]) != 8) | |
157 | return 1; | |
158 | while (memcmp(p, "data", 4)) { | |
159 | int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24; | |
160 | fseek(f[i], s, SEEK_CUR); | |
161 | if (fread(p, 1, 8, f[i]) != 8) | |
162 | return 1; | |
163 | } | |
164 | } else { | |
165 | fseek(f[i], -12, SEEK_CUR); | |
166 | } | |
167 | } | |
168 | ||
169 | fseek(f[shift < 0], abs(shift), SEEK_CUR); | |
170 | ||
171 | fseek(f[0], skip_bytes, SEEK_CUR); | |
172 | fseek(f[1], skip_bytes, SEEK_CUR); | |
173 | } | |
174 | ||
175 | for (;;) { | |
176 | int s0 = fread(buf[0], 1, SIZE, f[0]); | |
177 | int s1 = fread(buf[1], 1, SIZE, f[1]); | |
178 | ||
179 | for (j = 0; j < FFMIN(s0, s1); j += len) { | |
180 | switch (len) { | |
181 | case 1: | |
182 | case 2: { | |
f6fa7814 | 183 | int64_t a, b; |
2ba45a60 DM |
184 | int dist; |
185 | if (len == 2) { | |
186 | a = get_s16l(buf[0] + j); | |
187 | b = get_s16l(buf[1] + j); | |
188 | } else { | |
189 | a = buf[0][j]; | |
190 | b = buf[1][j]; | |
191 | } | |
192 | sse += (a - b) * (a - b); | |
193 | dist = abs(a - b); | |
194 | if (dist > maxdist) | |
195 | maxdist = dist; | |
196 | break; | |
197 | } | |
198 | case 4: | |
199 | case 8: { | |
200 | double dist, a, b; | |
201 | if (len == 8) { | |
202 | a = get_f64l(buf[0] + j); | |
203 | b = get_f64l(buf[1] + j); | |
204 | } else { | |
205 | a = get_f32l(buf[0] + j); | |
206 | b = get_f32l(buf[1] + j); | |
207 | } | |
208 | dist = fabs(a - b); | |
209 | sse_d += (a - b) * (a - b); | |
210 | if (dist > maxdist_d) | |
211 | maxdist_d = dist; | |
212 | break; | |
213 | } | |
214 | } | |
215 | } | |
216 | size0 += s0; | |
217 | size1 += s1; | |
218 | if (s0 + s1 <= 0) | |
219 | break; | |
220 | } | |
221 | ||
222 | i = FFMIN(size0, size1) / len; | |
223 | if (!i) | |
224 | i = 1; | |
225 | switch (len) { | |
226 | case 1: | |
227 | case 2: { | |
228 | uint64_t psnr; | |
229 | uint64_t dev = int_sqrt(((sse / i) * F * F) + (((sse % i) * F * F) + i / 2) / i); | |
230 | if (sse) | |
231 | psnr = ((2 * log16(max << 16) + log16(i) - log16(sse)) * | |
232 | 284619LL * F + (1LL << 31)) / (1LL << 32); | |
233 | else | |
234 | psnr = 1000 * F - 1; // floating point free infinity :) | |
235 | ||
236 | printf("stddev:%5d.%02d PSNR:%3d.%02d MAXDIFF:%5"PRIu64" bytes:%9d/%9d\n", | |
237 | (int)(dev / F), (int)(dev % F), | |
238 | (int)(psnr / F), (int)(psnr % F), | |
239 | maxdist, size0, size1); | |
240 | return psnr; | |
241 | } | |
242 | case 4: | |
243 | case 8: { | |
244 | char psnr_str[64]; | |
245 | double psnr = INT_MAX; | |
246 | double dev = sqrt(sse_d / i); | |
247 | uint64_t scale = (len == 4) ? (1ULL << 24) : (1ULL << 32); | |
248 | ||
249 | if (sse_d) { | |
250 | psnr = 2 * log(DBL_MAX) - log(i / sse_d); | |
251 | snprintf(psnr_str, sizeof(psnr_str), "%5.02f", psnr); | |
252 | } else | |
253 | snprintf(psnr_str, sizeof(psnr_str), "inf"); | |
254 | ||
255 | maxdist = maxdist_d * scale; | |
256 | ||
257 | printf("stddev:%10.2f PSNR:%s MAXDIFF:%10"PRIu64" bytes:%9d/%9d\n", | |
258 | dev * scale, psnr_str, maxdist, size0, size1); | |
259 | return psnr; | |
260 | } | |
261 | } | |
262 | return -1; | |
263 | } | |
264 | ||
265 | int main(int argc, char *argv[]) | |
266 | { | |
267 | FILE *f[2]; | |
268 | int len = 1; | |
269 | int shift_first= argc < 5 ? 0 : atoi(argv[4]); | |
270 | int skip_bytes = argc < 6 ? 0 : atoi(argv[5]); | |
271 | int shift_last = shift_first + (argc < 7 ? 0 : atoi(argv[6])); | |
272 | int shift; | |
273 | int max_psnr = -1; | |
274 | int max_psnr_shift = 0; | |
275 | ||
276 | if (argc > 3) { | |
277 | if (!strcmp(argv[3], "u8")) { | |
278 | len = 1; | |
279 | } else if (!strcmp(argv[3], "s16")) { | |
280 | len = 2; | |
281 | } else if (!strcmp(argv[3], "f32")) { | |
282 | len = 4; | |
283 | } else if (!strcmp(argv[3], "f64")) { | |
284 | len = 8; | |
285 | } else { | |
286 | char *end; | |
287 | len = strtol(argv[3], &end, 0); | |
288 | if (*end || len < 1 || len > 2) { | |
289 | fprintf(stderr, "Unsupported sample format: %s\nSupported: u8, s16, f32, f64\n", argv[3]); | |
290 | return 1; | |
291 | } | |
292 | } | |
293 | } | |
294 | ||
295 | if (argc < 3) { | |
296 | printf("tiny_psnr <file1> <file2> [<elem size>|u8|s16|f32|f64 [<shift> [<skip bytes> [<shift search range>]]]]\n"); | |
297 | printf("WAV headers are skipped automatically.\n"); | |
298 | return 1; | |
299 | } | |
300 | ||
301 | f[0] = fopen(argv[1], "rb"); | |
302 | f[1] = fopen(argv[2], "rb"); | |
303 | if (!f[0] || !f[1]) { | |
304 | fprintf(stderr, "Could not open input files.\n"); | |
305 | return 1; | |
306 | } | |
307 | ||
308 | for (shift = shift_first; shift <= shift_last; shift++) { | |
309 | int psnr = run_psnr(f, len, shift, skip_bytes); | |
310 | if (psnr > max_psnr || (shift < 0 && psnr == max_psnr)) { | |
311 | max_psnr = psnr; | |
312 | max_psnr_shift = shift; | |
313 | } | |
314 | } | |
315 | if (shift_last > shift_first) | |
316 | printf("Best PSNR is %3d.%02d for shift %i\n", (int)(max_psnr / F), (int)(max_psnr % F), max_psnr_shift); | |
317 | return 0; | |
318 | } |