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()
log16(uint64_t a)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
int_sqrt(uint64_t a)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
get_s16l(uint8_t * p)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
get_f32l(uint8_t * p)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
get_f64l(uint8_t * p)128 static double get_f64l(uint8_t *p)
129 {
130 return av_int2double(AV_RL64(p));
131 }
132
run_psnr(FILE * f[2],int len,int shift,int skip_bytes)133 static int run_psnr(FILE *f[2], int len, int shift, int skip_bytes)
134 {
135 uint64_t 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 uint64_t size0 = 0;
141 uint64_t 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: {
183 int64_t a, b;
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 = llabs(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:%9"PRIu64"/%9"PRIu64"\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:%9"PRIu64"/%9"PRIu64"\n",
258 dev * scale, psnr_str, maxdist, size0, size1);
259 return psnr;
260 }
261 }
262 return -1;
263 }
264
main(int argc,char * argv[])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 (shift_last > shift_first)
277 shift_first -= shift_last - shift_first;
278
279 if (argc > 3) {
280 if (!strcmp(argv[3], "u8")) {
281 len = 1;
282 } else if (!strcmp(argv[3], "s16")) {
283 len = 2;
284 } else if (!strcmp(argv[3], "f32")) {
285 len = 4;
286 } else if (!strcmp(argv[3], "f64")) {
287 len = 8;
288 } else {
289 char *end;
290 len = strtol(argv[3], &end, 0);
291 if (*end || len < 1 || len > 2) {
292 fprintf(stderr, "Unsupported sample format: %s\nSupported: u8, s16, f32, f64\n", argv[3]);
293 return 1;
294 }
295 }
296 }
297
298 if (argc < 3) {
299 printf("tiny_psnr <file1> <file2> [<elem size>|u8|s16|f32|f64 [<shift> [<skip bytes> [<shift search range>]]]]\n");
300 printf("WAV headers are skipped automatically.\n");
301 return 1;
302 }
303
304 f[0] = fopen(argv[1], "rb");
305 f[1] = fopen(argv[2], "rb");
306 if (!f[0] || !f[1]) {
307 fprintf(stderr, "Could not open input files.\n");
308 return 1;
309 }
310
311 for (shift = shift_first; shift <= shift_last; shift++) {
312 int psnr = run_psnr(f, len, shift, skip_bytes);
313 if (psnr > max_psnr || (shift < 0 && psnr == max_psnr)) {
314 max_psnr = psnr;
315 max_psnr_shift = shift;
316 }
317 }
318 if (max_psnr < 0)
319 return 2;
320
321 if (shift_last > shift_first)
322 printf("Best PSNR is %3d.%02d for shift %i\n", (int)(max_psnr / F), (int)(max_psnr % F), max_psnr_shift);
323 return 0;
324 }
325