FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/eval.c
Date: 2025-11-27 01:25:54
Exec Total Coverage
Lines: 418 469 89.1%
Functions: 18 20 90.0%
Branches: 378 463 81.6%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2002-2006 Michael Niedermayer <michaelni@gmx.at>
3 * Copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * simple arithmetic expression evaluator.
25 *
26 * see http://joe.hotchkiss.com/programming/eval/eval.html
27 */
28
29 #include <float.h>
30 #include "attributes.h"
31 #include "avutil.h"
32 #include "common.h"
33 #include "eval.h"
34 #include "ffmath.h"
35 #include "log.h"
36 #include "mathematics.h"
37 #include "mem.h"
38 #include "sfc64.h"
39 #include "time.h"
40 #include "avstring.h"
41 #include "reverse.h"
42
43 typedef struct Parser {
44 const AVClass *class;
45 int stack_index;
46 char *s;
47 const double *const_values;
48 const char * const *const_names; // NULL terminated
49 double (* const *funcs1)(void *, double a); // NULL terminated
50 const char * const *func1_names; // NULL terminated
51 double (* const *funcs2)(void *, double a, double b); // NULL terminated
52 const char * const *func2_names; // NULL terminated
53 void *opaque;
54 int log_offset;
55 void *log_ctx;
56 #define VARS 10
57 double *var;
58 FFSFC64 *prng_state;
59 } Parser;
60
61 static const AVClass eval_class = {
62 .class_name = "Eval",
63 .item_name = av_default_item_name,
64 .option = NULL,
65 .version = LIBAVUTIL_VERSION_INT,
66 .log_level_offset_offset = offsetof(Parser, log_offset),
67 .parent_log_context_offset = offsetof(Parser, log_ctx),
68 };
69
70 static const struct {
71 double bin_val;
72 double dec_val;
73 int8_t exp;
74 } si_prefixes['z' - 'E' + 1] = {
75 ['y'-'E']= { 8.271806125530276749e-25, 1e-24, -24 },
76 ['z'-'E']= { 8.4703294725430034e-22, 1e-21, -21 },
77 ['a'-'E']= { 8.6736173798840355e-19, 1e-18, -18 },
78 ['f'-'E']= { 8.8817841970012523e-16, 1e-15, -15 },
79 ['p'-'E']= { 9.0949470177292824e-13, 1e-12, -12 },
80 ['n'-'E']= { 9.3132257461547852e-10, 1e-9, -9 },
81 ['u'-'E']= { 9.5367431640625e-7, 1e-6, -6 },
82 ['m'-'E']= { 9.765625e-4, 1e-3, -3 },
83 ['c'-'E']= { 9.8431332023036951e-3, 1e-2, -2 },
84 ['d'-'E']= { 9.921256574801246e-2, 1e-1, -1 },
85 ['h'-'E']= { 1.0159366732596479e2, 1e2, 2 },
86 ['k'-'E']= { 1.024e3, 1e3, 3 },
87 ['K'-'E']= { 1.024e3, 1e3, 3 },
88 ['M'-'E']= { 1.048576e6, 1e6, 6 },
89 ['G'-'E']= { 1.073741824e9, 1e9, 9 },
90 ['T'-'E']= { 1.099511627776e12, 1e12, 12 },
91 ['P'-'E']= { 1.125899906842624e15, 1e15, 15 },
92 ['E'-'E']= { 1.152921504606847e18, 1e18, 18 },
93 ['Z'-'E']= { 1.1805916207174113e21, 1e21, 21 },
94 ['Y'-'E']= { 1.2089258196146292e24, 1e24, 24 },
95 };
96
97 static const struct {
98 const char *name;
99 double value;
100 } constants[] = {
101 { "E", M_E },
102 { "PI", M_PI },
103 { "PHI", M_PHI },
104 { "QP2LAMBDA", FF_QP2LAMBDA },
105 };
106
107 120991 double av_strtod(const char *numstr, char **tail)
108 {
109 double d;
110 char *next;
111
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 120991 if(numstr[0]=='0' && (numstr[1]|0x20)=='x') {
112 139 d = strtoul(numstr, &next, 16);
113 } else
114 120852 d = strtod(numstr, &next);
115 /* if parsing succeeded, check for and interpret postfixes */
116
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 120991 if (next!=numstr) {
117
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 92137 if (next[0] == 'd' && next[1] == 'B') {
118 /* treat dB as decibels instead of decibytes */
119 6 d = ff_exp10(d / 20);
120 6 next += 2;
121
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 92131 } else if (*next >= 'E' && *next <= 'z') {
122 181 int e= si_prefixes[*next - 'E'].exp;
123
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 181 if (e) {
124
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 179 if (next[1] == 'i') {
125 6 d*= si_prefixes[*next - 'E'].bin_val;
126 6 next+=2;
127 } else {
128 173 d*= si_prefixes[*next - 'E'].dec_val;
129 173 next++;
130 }
131 }
132 }
133
134
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 92137 if (*next=='B') {
135 1 d*=8;
136 1 next++;
137 }
138 }
139 /* if requested, fill in tail with the position after the last parsed
140 character */
141
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 120991 if (tail)
142 120986 *tail = next;
143 120991 return d;
144 }
145
146 #define IS_IDENTIFIER_CHAR(c) ((c) - '0' <= 9U || (c) - 'a' <= 25U || (c) - 'A' <= 25U || (c) == '_')
147
148 410035 static int strmatch(const char *s, const char *prefix)
149 {
150 int i;
151
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 525217 for (i=0; prefix[i]; i++) {
152
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 496385 if (prefix[i] != s[i]) return 0;
153 }
154 /* return 1 only if the s identifier is terminated */
155
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 28832 return !IS_IDENTIFIER_CHAR(s[i]);
156 }
157
158 struct AVExpr {
159 enum {
160 e_value, e_const, e_func0, e_func1, e_func2,
161 e_squish, e_gauss, e_ld, e_isnan, e_isinf,
162 e_mod, e_max, e_min, e_eq, e_gt, e_gte, e_lte, e_lt,
163 e_pow, e_mul, e_div, e_add,
164 e_last, e_st, e_while, e_taylor, e_root, e_floor, e_ceil, e_trunc, e_round,
165 e_sqrt, e_not, e_random, e_hypot, e_gcd,
166 e_if, e_ifnot, e_print, e_bitand, e_bitor, e_between, e_clip, e_atan2, e_lerp,
167 e_sgn, e_randomi
168 } type;
169 double value; // is sign in other types
170 int const_index;
171 union {
172 double (*func0)(double);
173 double (*func1)(void *, double);
174 double (*func2)(void *, double, double);
175 } a;
176 struct AVExpr *param[3];
177 double *var;
178 FFSFC64 *prng_state;
179 };
180
181 ✗ static double etime(double v)
182 {
183 ✗ return av_gettime() * 0.000001;
184 }
185
186 207071948 static double eval_expr(Parser *p, AVExpr *e)
187 {
188
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 207071948 switch (e->type) {
189 66649758 case e_value: return e->value;
190 38799845 case e_const: return e->value * p->const_values[e->const_index];
191 17334500 case e_func0: return e->value * e->a.func0(eval_expr(p, e->param[0]));
192 280986 case e_func1: return e->value * e->a.func1(p->opaque, eval_expr(p, e->param[0]));
193 6 case e_func2: return e->value * e->a.func2(p->opaque, eval_expr(p, e->param[0]), eval_expr(p, e->param[1]));
194 1 case e_squish: return 1/(1+exp(4*eval_expr(p, e->param[0])));
195 1 case e_gauss: { double d = eval_expr(p, e->param[0]); return exp(-d*d/2)/sqrt(2*M_PI); }
196 1695 case e_ld: return e->value * p->var[av_clip(eval_expr(p, e->param[0]), 0, VARS-1)];
197
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 4 case e_isnan: return e->value * !!isnan(eval_expr(p, e->param[0]));
198
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 3 case e_isinf: return e->value * !!isinf(eval_expr(p, e->param[0]));
199 20 case e_floor: return e->value * floor(eval_expr(p, e->param[0]));
200 2 case e_ceil : return e->value * ceil (eval_expr(p, e->param[0]));
201 2 case e_trunc: return e->value * trunc(eval_expr(p, e->param[0]));
202 ✗ case e_round: return e->value * round(eval_expr(p, e->param[0]));
203 ✗ case e_sgn: return e->value * FFDIFFSIGN(eval_expr(p, e->param[0]), 0);
204 2 case e_sqrt: return e->value * sqrt (eval_expr(p, e->param[0]));
205
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 301 case e_not: return e->value * (eval_expr(p, e->param[0]) == 0);
206
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 49379 case e_if: return e->value * (eval_expr(p, e->param[0]) ? eval_expr(p, e->param[1]) :
207
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 16494 e->param[2] ? eval_expr(p, e->param[2]) : 0);
208
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 6 case e_ifnot: return e->value * (!eval_expr(p, e->param[0]) ? eval_expr(p, e->param[1]) :
209
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 2 e->param[2] ? eval_expr(p, e->param[2]) : 0);
210 3 case e_clip: {
211 3 double x = eval_expr(p, e->param[0]);
212 3 double min = eval_expr(p, e->param[1]), max = eval_expr(p, e->param[2]);
213
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 3 if (isnan(min) || isnan(max) || isnan(x) || min > max)
214 3 return NAN;
215 ✗ return e->value * av_clipd(eval_expr(p, e->param[0]), min, max);
216 }
217 1323200 case e_between: {
218 1323200 double d = eval_expr(p, e->param[0]);
219
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 2117095 return e->value * (d >= eval_expr(p, e->param[1]) &&
220 793895 d <= eval_expr(p, e->param[2]));
221 }
222 ✗ case e_lerp: {
223 ✗ double v0 = eval_expr(p, e->param[0]);
224 ✗ double v1 = eval_expr(p, e->param[1]);
225 ✗ double f = eval_expr(p, e->param[2]);
226 ✗ return v0 + (v1 - v0) * f;
227 }
228 1 case e_print: {
229 1 double x = eval_expr(p, e->param[0]);
230
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 1 int level = e->param[1] ? av_clip(eval_expr(p, e->param[1]), INT_MIN, INT_MAX) : AV_LOG_INFO;
231 1 av_log(p, level, "%f\n", x);
232 1 return x;
233 }
234
235 #define COMPUTE_NEXT_RANDOM() \
236 int idx = av_clip(eval_expr(p, e->param[0]), 0, VARS-1); \
237 FFSFC64 *s = p->prng_state + idx; \
238 uint64_t r; \
239 \
240 if (!s->counter) { \
241 r = isnan(p->var[idx]) ? 0 : p->var[idx]; \
242 ff_sfc64_init(s, r, r, r, 12); \
243 } \
244 r = ff_sfc64_get(s); \
245 p->var[idx] = r; \
246
247 264913 case e_random: {
248
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 264913 COMPUTE_NEXT_RANDOM();
249 264913 return r * (1.0/UINT64_MAX);
250 }
251 ✗ case e_randomi: {
252 ✗ double min = eval_expr(p, e->param[1]);
253 ✗ double max = eval_expr(p, e->param[2]);
254 ✗ COMPUTE_NEXT_RANDOM();
255 ✗ return min + (max - min) * r / UINT64_MAX;
256 }
257 4 case e_while: {
258 4 double d = NAN;
259
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 214 while (eval_expr(p, e->param[0]))
260 210 d=eval_expr(p, e->param[1]);
261 4 return d;
262 }
263 2 case e_taylor: {
264 2 double t = 1, d = 0, v;
265 2 double x = eval_expr(p, e->param[1]);
266
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 2 int id = e->param[2] ? av_clip(eval_expr(p, e->param[2]), 0, VARS-1) : 0;
267 int i;
268 2 double var0 = p->var[id];
269
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 43 for(i=0; i<1000; i++) {
270 43 double ld = d;
271 43 p->var[id] = i;
272 43 v = eval_expr(p, e->param[0]);
273 43 d += t*v;
274
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 43 if(ld==d && v)
275 2 break;
276 41 t *= x / (i+1);
277 }
278 2 p->var[id] = var0;
279 2 return d;
280 }
281 2 case e_root: {
282 int i, j;
283 2 double low = -1, high = -1, v, low_v = -DBL_MAX, high_v = DBL_MAX;
284 2 double var0 = p->var[0];
285 2 double x_max = eval_expr(p, e->param[1]);
286
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 491 for(i=-1; i<1024; i++) {
287
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 491 if(i<255) {
288 315 p->var[0] = ff_reverse[i&255]*x_max/255;
289 } else {
290 176 p->var[0] = x_max*pow(0.9, i-255);
291
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 176 if (i&1) p->var[0] *= -1;
292
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 176 if (i&2) p->var[0] += low;
293 88 else p->var[0] += high;
294 }
295 491 v = eval_expr(p, e->param[0]);
296
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 491 if (v<=0 && v>low_v) {
297 30 low = p->var[0];
298 30 low_v = v;
299 }
300
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 491 if (v>=0 && v<high_v) {
301 6 high = p->var[0];
302 6 high_v = v;
303 }
304
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 491 if (low>=0 && high>=0){
305
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 48 for (j=0; j<1000; j++) {
306 48 p->var[0] = (low+high)*0.5;
307
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 48 if (low == p->var[0] || high == p->var[0])
308 break;
309 46 v = eval_expr(p, e->param[0]);
310
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 46 if (v<=0) low = p->var[0];
311
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 46 if (v>=0) high= p->var[0];
312
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 46 if (isnan(v)) {
313 ✗ low = high = v;
314 ✗ break;
315 }
316 }
317 2 break;
318 }
319 }
320 2 p->var[0] = var0;
321
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 2 return -low_v<high_v ? low : high;
322 }
323 82383808 default: {
324 82383808 double d = eval_expr(p, e->param[0]);
325 82383808 double d2 = eval_expr(p, e->param[1]);
326
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 82383808 switch (e->type) {
327
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 198 case e_mod: return e->value * (d - floor(d2 ? d / d2 : d * INFINITY) * d2);
328 1 case e_gcd: return e->value * av_gcd(d,d2);
329
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 2 case e_max: return e->value * (d > d2 ? d : d2);
330
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 1 case e_min: return e->value * (d < d2 ? d : d2);
331
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 234 case e_eq: return e->value * (d == d2 ? 1.0 : 0.0);
332
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 1333 case e_gt: return e->value * (d > d2 ? 1.0 : 0.0);
333
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 1116 case e_gte: return e->value * (d >= d2 ? 1.0 : 0.0);
334
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 1117 case e_lt: return e->value * (d < d2 ? 1.0 : 0.0);
335
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 216 case e_lte: return e->value * (d <= d2 ? 1.0 : 0.0);
336 4634 case e_pow: return e->value * pow(d, d2);
337 67677547 case e_mul: return e->value * (d * d2);
338
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 3611103 case e_div: return e->value * (d2 ? (d / d2) : d * INFINITY);
339 11085595 case e_add: return e->value * (d + d2);
340 243 case e_last:return e->value * d2;
341 464 case e_st : {
342 464 int index = av_clip(d, 0, VARS-1);
343 464 p->prng_state[index].counter = 0;
344 464 return e->value * (p->var[index]= d2);
345 }
346 1 case e_hypot:return e->value * hypot(d, d2);
347 ✗ case e_atan2:return e->value * atan2(d, d2);
348
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 2 case e_bitand: return isnan(d) || isnan(d2) ? NAN : e->value * ((long int)d & (long int)d2);
349
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 1 case e_bitor: return isnan(d) || isnan(d2) ? NAN : e->value * ((long int)d | (long int)d2);
350 }
351 }
352 }
353 ✗ return NAN;
354 }
355
356 static int parse_expr(AVExpr **e, Parser *p);
357
358 508254 void av_expr_free(AVExpr *e)
359 {
360
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 508254 if (!e) return;
361 83776 av_expr_free(e->param[0]);
362 83776 av_expr_free(e->param[1]);
363 83776 av_expr_free(e->param[2]);
364 83776 av_freep(&e->var);
365 83776 av_freep(&e->prng_state);
366 83776 av_freep(&e);
367 }
368
369 82296 static int parse_primary(AVExpr **e, Parser *p)
370 {
371 82296 AVExpr *d = av_mallocz(sizeof(AVExpr));
372 82296 char *next = p->s, *s0 = p->s;
373 int ret, i;
374
375
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 82296 if (!d)
376 ✗ return AVERROR(ENOMEM);
377
378 /* number */
379 82296 d->value = av_strtod(p->s, &next);
380
2/2
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✓ Branch 1 taken 28854 times.
 82296 if (next != p->s) {
381 53442 d->type = e_value;
382 53442 p->s= next;
383 53442 *e = d;
384 53442 return 0;
385 }
386 28854 d->value = 1;
387
388 /* named constants */
389
4/4
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✓ Branch 2 taken 398417 times.
✓ Branch 3 taken 434 times.
 398866 for (i=0; p->const_names && p->const_names[i]; i++) {
390
2/2
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✓ Branch 2 taken 370012 times.
 398417 if (strmatch(p->s, p->const_names[i])) {
391 28405 p->s+= strlen(p->const_names[i]);
392 28405 d->type = e_const;
393 28405 d->const_index = i;
394 28405 *e = d;
395 28405 return 0;
396 }
397 }
398
2/2
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✓ Branch 1 taken 388 times.
 2062 for (i = 0; i < FF_ARRAY_ELEMS(constants); i++) {
399
2/2
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✓ Branch 2 taken 1613 times.
 1674 if (strmatch(p->s, constants[i].name)) {
400 61 p->s += strlen(constants[i].name);
401 61 d->type = e_value;
402 61 d->value = constants[i].value;
403 61 *e = d;
404 61 return 0;
405 }
406 }
407
408 388 p->s= strchr(p->s, '(');
409
2/2
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✓ Branch 1 taken 360 times.
 388 if (!p->s) {
410 28 av_log(p, AV_LOG_ERROR, "Undefined constant or missing '(' in '%s'\n", s0);
411 28 p->s= next;
412 28 av_expr_free(d);
413 28 return AVERROR(EINVAL);
414 }
415 360 p->s++; // "("
416
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✓ Branch 1 taken 332 times.
 360 if (*next == '(') { // special case do-nothing
417 28 av_freep(&d);
418
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 28 if ((ret = parse_expr(&d, p)) < 0)
419 ✗ return ret;
420
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 28 if (p->s[0] != ')') {
421 ✗ av_log(p, AV_LOG_ERROR, "Missing ')' in '%s'\n", s0);
422 ✗ av_expr_free(d);
423 ✗ return AVERROR(EINVAL);
424 }
425 28 p->s++; // ")"
426 28 *e = d;
427 28 return 0;
428 }
429
2/2
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✓ Branch 2 taken 328 times.
 332 if ((ret = parse_expr(&(d->param[0]), p)) < 0) {
430 4 av_expr_free(d);
431 4 return ret;
432 }
433
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✓ Branch 1 taken 208 times.
 328 if (p->s[0]== ',') {
434 120 p->s++; // ","
435 120 parse_expr(&d->param[1], p);
436 }
437
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✓ Branch 1 taken 299 times.
 328 if (p->s[0]== ',') {
438 29 p->s++; // ","
439 29 parse_expr(&d->param[2], p);
440 }
441
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 328 if (p->s[0] != ')') {
442 ✗ av_log(p, AV_LOG_ERROR, "Missing ')' or too many args in '%s'\n", s0);
443 ✗ av_expr_free(d);
444 ✗ return AVERROR(EINVAL);
445 }
446 328 p->s++; // ")"
447
448 328 d->type = e_func0;
449
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 328 if (strmatch(next, "sinh" )) d->a.func0 = sinh;
450
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 328 else if (strmatch(next, "cosh" )) d->a.func0 = cosh;
451
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 328 else if (strmatch(next, "tanh" )) d->a.func0 = tanh;
452
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✓ Branch 2 taken 300 times.
 328 else if (strmatch(next, "sin" )) d->a.func0 = sin;
453
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✓ Branch 2 taken 289 times.
 300 else if (strmatch(next, "cos" )) d->a.func0 = cos;
454
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 289 else if (strmatch(next, "tan" )) d->a.func0 = tan;
455
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 289 else if (strmatch(next, "atan" )) d->a.func0 = atan;
456
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 289 else if (strmatch(next, "asin" )) d->a.func0 = asin;
457
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 289 else if (strmatch(next, "acos" )) d->a.func0 = acos;
458
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 289 else if (strmatch(next, "exp" )) d->a.func0 = exp;
459
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 289 else if (strmatch(next, "log" )) d->a.func0 = log;
460
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 288 else if (strmatch(next, "abs" )) d->a.func0 = fabs;
461
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 288 else if (strmatch(next, "time" )) d->a.func0 = etime;
462
2/2
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✓ Branch 2 taken 287 times.
 288 else if (strmatch(next, "squish")) d->type = e_squish;
463
2/2
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✓ Branch 2 taken 286 times.
 287 else if (strmatch(next, "gauss" )) d->type = e_gauss;
464
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✓ Branch 2 taken 278 times.
 286 else if (strmatch(next, "mod" )) d->type = e_mod;
465
2/2
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✓ Branch 2 taken 276 times.
 278 else if (strmatch(next, "max" )) d->type = e_max;
466
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✓ Branch 2 taken 275 times.
 276 else if (strmatch(next, "min" )) d->type = e_min;
467
2/2
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✓ Branch 2 taken 264 times.
 275 else if (strmatch(next, "eq" )) d->type = e_eq;
468
2/2
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✓ Branch 2 taken 257 times.
 264 else if (strmatch(next, "gte" )) d->type = e_gte;
469
2/2
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✓ Branch 2 taken 252 times.
 257 else if (strmatch(next, "gt" )) d->type = e_gt;
470
2/2
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✓ Branch 2 taken 246 times.
 252 else if (strmatch(next, "lte" )) d->type = e_lte;
471
2/2
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✓ Branch 2 taken 238 times.
 246 else if (strmatch(next, "lt" )) d->type = e_lt;
472
2/2
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✓ Branch 2 taken 213 times.
 238 else if (strmatch(next, "ld" )) d->type = e_ld;
473
2/2
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✓ Branch 2 taken 209 times.
 213 else if (strmatch(next, "isnan" )) d->type = e_isnan;
474
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✓ Branch 2 taken 206 times.
 209 else if (strmatch(next, "isinf" )) d->type = e_isinf;
475
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✓ Branch 2 taken 190 times.
 206 else if (strmatch(next, "st" )) d->type = e_st;
476
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✓ Branch 2 taken 186 times.
 190 else if (strmatch(next, "while" )) d->type = e_while;
477
2/2
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✓ Branch 2 taken 184 times.
 186 else if (strmatch(next, "taylor")) d->type = e_taylor;
478
2/2
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✓ Branch 2 taken 182 times.
 184 else if (strmatch(next, "root" )) d->type = e_root;
479
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✓ Branch 2 taken 178 times.
 182 else if (strmatch(next, "floor" )) d->type = e_floor;
480
2/2
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✓ Branch 2 taken 176 times.
 178 else if (strmatch(next, "ceil" )) d->type = e_ceil;
481
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✓ Branch 2 taken 174 times.
 176 else if (strmatch(next, "trunc" )) d->type = e_trunc;
482
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 174 else if (strmatch(next, "round" )) d->type = e_round;
483
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✓ Branch 2 taken 172 times.
 174 else if (strmatch(next, "sqrt" )) d->type = e_sqrt;
484
2/2
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✓ Branch 2 taken 159 times.
 172 else if (strmatch(next, "not" )) d->type = e_not;
485
2/2
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✓ Branch 2 taken 156 times.
 159 else if (strmatch(next, "pow" )) d->type = e_pow;
486
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✓ Branch 2 taken 155 times.
 156 else if (strmatch(next, "print" )) d->type = e_print;
487
2/2
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✓ Branch 2 taken 48 times.
 155 else if (strmatch(next, "random")) d->type = e_random;
488
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 48 else if (strmatch(next, "randomi")) d->type = e_randomi;
489
2/2
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✓ Branch 2 taken 47 times.
 48 else if (strmatch(next, "hypot" )) d->type = e_hypot;
490
2/2
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✓ Branch 2 taken 46 times.
 47 else if (strmatch(next, "gcd" )) d->type = e_gcd;
491
2/2
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✓ Branch 2 taken 33 times.
 46 else if (strmatch(next, "if" )) d->type = e_if;
492
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✓ Branch 2 taken 29 times.
 33 else if (strmatch(next, "ifnot" )) d->type = e_ifnot;
493
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✓ Branch 2 taken 27 times.
 29 else if (strmatch(next, "bitand")) d->type = e_bitand;
494
2/2
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✓ Branch 2 taken 26 times.
 27 else if (strmatch(next, "bitor" )) d->type = e_bitor;
495
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✓ Branch 2 taken 14 times.
 26 else if (strmatch(next, "between"))d->type = e_between;
496
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✓ Branch 2 taken 11 times.
 14 else if (strmatch(next, "clip" )) d->type = e_clip;
497
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 11 else if (strmatch(next, "atan2" )) d->type = e_atan2;
498
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 11 else if (strmatch(next, "lerp" )) d->type = e_lerp;
499
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 11 else if (strmatch(next, "sgn" )) d->type = e_sgn;
500 else {
501
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✓ Branch 2 taken 4 times.
✗ Branch 3 not taken.
 11 for (i=0; p->func1_names && p->func1_names[i]; i++) {
502
1/2
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✗ Branch 2 not taken.
 4 if (strmatch(next, p->func1_names[i])) {
503 4 d->a.func1 = p->funcs1[i];
504 4 d->type = e_func1;
505 4 d->const_index = i;
506 4 *e = d;
507 4 return 0;
508 }
509 }
510
511
3/4
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✓ Branch 2 taken 6 times.
✗ Branch 3 not taken.
 7 for (i=0; p->func2_names && p->func2_names[i]; i++) {
512
1/2
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✗ Branch 2 not taken.
 6 if (strmatch(next, p->func2_names[i])) {
513 6 d->a.func2 = p->funcs2[i];
514 6 d->type = e_func2;
515 6 d->const_index = i;
516 6 *e = d;
517 6 return 0;
518 }
519 }
520
521 1 av_log(p, AV_LOG_ERROR, "Unknown function in '%s'\n", s0);
522 1 av_expr_free(d);
523 1 return AVERROR(EINVAL);
524 }
525
526 317 *e = d;
527 317 return 0;
528 }
529
530 1508 static AVExpr *make_eval_expr(int type, int value, AVExpr *p0, AVExpr *p1)
531 {
532 1508 AVExpr *e = av_mallocz(sizeof(AVExpr));
533
1/2
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✓ Branch 1 taken 1508 times.
 1508 if (!e)
534 ✗ return NULL;
535 1508 e->type =type ;
536 1508 e->value =value ;
537 1508 e->param[0] =p0 ;
538 1508 e->param[1] =p1 ;
539 1508 return e;
540 }
541
542 82293 static int parse_pow(AVExpr **e, Parser *p, int *sign)
543 {
544 82293 *sign= (*p->s == '+') - (*p->s == '-');
545 82293 p->s += *sign&1;
546 82293 return parse_primary(e, p);
547 }
548
549 82296 static int parse_dB(AVExpr **e, Parser *p, int *sign)
550 {
551 /* do not filter out the negative sign when parsing a dB value.
552 for example, -3dB is not the same as -(3dB) */
553
2/2
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✓ Branch 1 taken 81851 times.
 82296 if (*p->s == '-') {
554 char *next;
555 445 av_unused double ignored = strtod(p->s, &next);
556
5/6
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✓ Branch 2 taken 3 times.
✓ Branch 3 taken 425 times.
✓ Branch 4 taken 3 times.
✗ Branch 5 not taken.
 445 if (next != p->s && next[0] == 'd' && next[1] == 'B') {
557 3 *sign = 0;
558 3 return parse_primary(e, p);
559 }
560 }
561 82293 return parse_pow(e, p, sign);
562 }
563
564 82087 static int parse_factor(AVExpr **e, Parser *p)
565 {
566 int sign, sign2, ret;
567 AVExpr *e0, *e1, *e2;
568
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✓ Branch 2 taken 82054 times.
 82087 if ((ret = parse_dB(&e0, p, &sign)) < 0)
569 33 return ret;
570
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✓ Branch 1 taken 82054 times.
 164317 while(p->s[0]=='^'){
571 209 e1 = e0;
572 209 p->s++;
573
1/2
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✓ Branch 2 taken 209 times.
 209 if ((ret = parse_dB(&e2, p, &sign2)) < 0) {
574 ✗ av_expr_free(e1);
575 ✗ return ret;
576 }
577 209 e0 = make_eval_expr(e_pow, 1, e1, e2);
578
1/2
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✓ Branch 1 taken 209 times.
 209 if (!e0) {
579 ✗ av_expr_free(e1);
580 ✗ av_expr_free(e2);
581 ✗ return AVERROR(ENOMEM);
582 }
583
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✓ Branch 1 taken 209 times.
 209 if (e0->param[1]) e0->param[1]->value *= (sign2|1);
584 }
585
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✗ Branch 1 not taken.
 82054 if (e0) e0->value *= (sign|1);
586
587 82054 *e = e0;
588 82054 return 0;
589 }
590
591 81180 static int parse_term(AVExpr **e, Parser *p)
592 {
593 int ret;
594 AVExpr *e0, *e1, *e2;
595
2/2
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✓ Branch 2 taken 81149 times.
 81180 if ((ret = parse_factor(&e0, p)) < 0)
596 31 return ret;
597
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✓ Branch 2 taken 353 times.
✓ Branch 3 taken 81147 times.
 82054 while (p->s[0]=='*' || p->s[0]=='/') {
598 907 int c= *p->s++;
599 907 e1 = e0;
600
2/2
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✓ Branch 2 taken 905 times.
 907 if ((ret = parse_factor(&e2, p)) < 0) {
601 2 av_expr_free(e1);
602 2 return ret;
603 }
604
2/2
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✓ Branch 1 taken 351 times.
 905 e0 = make_eval_expr(c == '*' ? e_mul : e_div, 1, e1, e2);
605
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✓ Branch 1 taken 905 times.
 905 if (!e0) {
606 ✗ av_expr_free(e1);
607 ✗ av_expr_free(e2);
608 ✗ return AVERROR(ENOMEM);
609 }
610 }
611 81147 *e = e0;
612 81147 return 0;
613 }
614
615 80803 static int parse_subexpr(AVExpr **e, Parser *p)
616 {
617 int ret;
618 AVExpr *e0, *e1, *e2;
619
2/2
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✓ Branch 2 taken 80771 times.
 80803 if ((ret = parse_term(&e0, p)) < 0)
620 32 return ret;
621
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✓ Branch 2 taken 210 times.
✓ Branch 3 taken 80770 times.
 81147 while (*p->s == '+' || *p->s == '-') {
622 377 e1 = e0;
623
2/2
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✓ Branch 2 taken 376 times.
 377 if ((ret = parse_term(&e2, p)) < 0) {
624 1 av_expr_free(e1);
625 1 return ret;
626 }
627 376 e0 = make_eval_expr(e_add, 1, e1, e2);
628
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✓ Branch 1 taken 376 times.
 376 if (!e0) {
629 ✗ av_expr_free(e1);
630 ✗ av_expr_free(e2);
631 ✗ return AVERROR(ENOMEM);
632 }
633 };
634
635 80770 *e = e0;
636 80770 return 0;
637 }
638
639 80785 static int parse_expr(AVExpr **e, Parser *p)
640 {
641 int ret;
642 AVExpr *e0, *e1, *e2;
643
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✓ Branch 1 taken 80785 times.
 80785 if (p->stack_index <= 0) //protect against stack overflows
644 ✗ return AVERROR(EINVAL);
645 80785 p->stack_index--;
646
647
2/2
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✓ Branch 2 taken 80752 times.
 80785 if ((ret = parse_subexpr(&e0, p)) < 0)
648 33 return ret;
649
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✓ Branch 1 taken 80752 times.
 80770 while (*p->s == ';') {
650 18 p->s++;
651 18 e1 = e0;
652
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✓ Branch 2 taken 18 times.
 18 if ((ret = parse_subexpr(&e2, p)) < 0) {
653 ✗ av_expr_free(e1);
654 ✗ return ret;
655 }
656 18 e0 = make_eval_expr(e_last, 1, e1, e2);
657
1/2
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✓ Branch 1 taken 18 times.
 18 if (!e0) {
658 ✗ av_expr_free(e1);
659 ✗ av_expr_free(e2);
660 ✗ return AVERROR(ENOMEM);
661 }
662 };
663
664 80752 p->stack_index++;
665 80752 *e = e0;
666 80752 return 0;
667 }
668
669 83728 static int verify_expr(AVExpr *e)
670 {
671
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✓ Branch 1 taken 83727 times.
 83728 if (!e) return 0;
672
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✓ Branch 2 taken 1 times.
✓ Branch 3 taken 19 times.
✓ Branch 4 taken 15 times.
✓ Branch 5 taken 1590 times.
 83727 switch (e->type) {
673 81894 case e_value:
674 81894 case e_const: return 1;
675 208 case e_func0:
676 case e_func1:
677 case e_squish:
678 case e_ld:
679 case e_gauss:
680 case e_isnan:
681 case e_isinf:
682 case e_floor:
683 case e_ceil:
684 case e_trunc:
685 case e_round:
686 case e_sqrt:
687 case e_not:
688 case e_random:
689 case e_sgn:
690
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✗ Branch 2 not taken.
✓ Branch 3 taken 207 times.
✓ Branch 4 taken 1 times.
 208 return verify_expr(e->param[0]) && !e->param[1];
691 1 case e_print:
692 1 return verify_expr(e->param[0])
693
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 1 && (!e->param[1] || verify_expr(e->param[1]));
694 19 case e_if:
695 case e_ifnot:
696 case e_taylor:
697
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✗ Branch 3 not taken.
 38 return verify_expr(e->param[0]) && verify_expr(e->param[1])
698
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✓ Branch 3 taken 5 times.
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✗ Branch 6 not taken.
 38 && (!e->param[2] || verify_expr(e->param[2]));
699 15 case e_between:
700 case e_clip:
701 case e_lerp:
702 case e_randomi:
703
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✗ Branch 2 not taken.
 30 return verify_expr(e->param[0]) &&
704
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✓ Branch 3 taken 14 times.
✓ Branch 4 taken 1 times.
 30 verify_expr(e->param[1]) &&
705 15 verify_expr(e->param[2]);
706
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 1590 default: return verify_expr(e->param[0]) && verify_expr(e->param[1]) && !e->param[2];
707 }
708 }
709
710 80276 int av_expr_parse(AVExpr **expr, const char *s,
711 const char * const *const_names,
712 const char * const *func1_names, double (* const *funcs1)(void *, double),
713 const char * const *func2_names, double (* const *funcs2)(void *, double, double),
714 int log_offset, void *log_ctx)
715 {
716 80276 Parser p = { 0 };
717 80276 AVExpr *e = NULL;
718 80276 char *w = av_malloc(strlen(s) + 1);
719 80276 char *wp = w;
720 80276 const char *s0 = s;
721 80276 int ret = 0;
722
723
1/2
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✓ Branch 1 taken 80276 times.
 80276 if (!w)
724 ✗ return AVERROR(ENOMEM);
725
726
2/2
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✓ Branch 1 taken 80276 times.
 252534 while (*s)
727
2/2
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✓ Branch 1 taken 443 times.
 172258 if (!av_isspace(*s++)) *wp++ = s[-1];
728 80276 *wp++ = 0;
729
730 80276 p.class = &eval_class;
731 80276 p.stack_index=100;
732 80276 p.s= w;
733 80276 p.const_names = const_names;
734 80276 p.funcs1 = funcs1;
735 80276 p.func1_names = func1_names;
736 80276 p.funcs2 = funcs2;
737 80276 p.func2_names = func2_names;
738 80276 p.log_offset = log_offset;
739 80276 p.log_ctx = log_ctx;
740
741
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 80276 if ((ret = parse_expr(&e, &p)) < 0)
742 29 goto end;
743
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 80247 if (*p.s) {
744 5 av_log(&p, AV_LOG_ERROR, "Invalid chars '%s' at the end of expression '%s'\n", p.s, s0);
745 5 ret = AVERROR(EINVAL);
746 5 goto end;
747 }
748
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 80242 if (!verify_expr(e)) {
749 2 ret = AVERROR(EINVAL);
750 2 goto end;
751 }
752 80240 e->var= av_mallocz(sizeof(double) *VARS);
753 80240 e->prng_state = av_mallocz(sizeof(*e->prng_state) *VARS);
754
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 80240 if (!e->var || !e->prng_state) {
755 ✗ ret = AVERROR(ENOMEM);
756 ✗ goto end;
757 }
758 80240 *expr = e;
759 80240 e = NULL;
760 80276 end:
761 80276 av_expr_free(e);
762 80276 av_free(w);
763 80276 return ret;
764 }
765
766 33777 static int expr_count(AVExpr *e, unsigned *counter, int size, int type)
767 {
768 int i;
769
770
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 33777 if (!e || !counter || !size)
771 ✗ return AVERROR(EINVAL);
772
773
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 33789 for (i = 0; e->type != type && i < 3 && e->param[i]; i++)
774 12 expr_count(e->param[i], counter, size, type);
775
776
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 33777 if (e->type == type && e->const_index < size)
777 28112 counter[e->const_index]++;
778
779 33777 return 0;
780 }
781
782 33765 int av_expr_count_vars(AVExpr *e, unsigned *counter, int size)
783 {
784 33765 return expr_count(e, counter, size, e_const);
785 }
786
787 ✗ int av_expr_count_func(AVExpr *e, unsigned *counter, int size, int arg)
788 {
789 ✗ return expr_count(e, counter, size, ((int[]){e_const, e_func1, e_func2})[arg]);
790 }
791
792 20914800 double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
793 {
794 20914800 Parser p = {
795 .class = &eval_class,
796 .const_values = const_values,
797 .opaque = opaque,
798 20914800 .var = e->var,
799 20914800 .prng_state = e->prng_state,
800 };
801
802 20914800 return eval_expr(&p, e);
803 }
804
805 56541 int av_expr_parse_and_eval(double *d, const char *s,
806 const char * const *const_names, const double *const_values,
807 const char * const *func1_names, double (* const *funcs1)(void *, double),
808 const char * const *func2_names, double (* const *funcs2)(void *, double, double),
809 void *opaque, int log_offset, void *log_ctx)
810 {
811 56541 AVExpr *e = NULL;
812 56541 int ret = av_expr_parse(&e, s, const_names, func1_names, funcs1, func2_names, funcs2, log_offset, log_ctx);
813
814
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 56541 if (ret < 0) {
815 36 *d = NAN;
816 36 return ret;
817 }
818 56505 *d = av_expr_eval(e, const_values, opaque);
819 56505 av_expr_free(e);
820
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 56505 return isnan(*d) ? AVERROR(EINVAL) : 0;
821 }
822