* Copyright (c) 2002-2006 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
* see http://joe.hotchkiss.com/programming/eval/eval.html
*/
-#include "libavutil/avutil.h"
+#include "avutil.h"
+#include "common.h"
#include "eval.h"
+#include "log.h"
+#include "mathematics.h"
typedef struct Parser {
const AVClass *class;
return d;
}
+#define IS_IDENTIFIER_CHAR(c) ((c) - '0' <= 9U || (c) - 'a' <= 25U || (c) - 'A' <= 25U || (c) == '_')
+
static int strmatch(const char *s, const char *prefix)
{
int i;
for (i=0; prefix[i]; i++) {
if (prefix[i] != s[i]) return 0;
}
- return 1;
+ /* return 1 only if the s identifier is terminated */
+ return !IS_IDENTIFIER_CHAR(s[i]);
}
struct AVExpr {
enum {
e_value, e_const, e_func0, e_func1, e_func2,
- e_squish, e_gauss, e_ld,
+ e_squish, e_gauss, e_ld, e_isnan, e_isinf,
e_mod, e_max, e_min, e_eq, e_gt, e_gte,
e_pow, e_mul, e_div, e_add,
- e_last, e_st, e_while,
+ e_last, e_st, e_while, e_floor, e_ceil, e_trunc,
+ e_sqrt, e_not,
} type;
double value; // is sign in other types
union {
case e_squish: return 1/(1+exp(4*eval_expr(p, e->param[0])));
case e_gauss: { double d = eval_expr(p, e->param[0]); return exp(-d*d/2)/sqrt(2*M_PI); }
case e_ld: return e->value * p->var[av_clip(eval_expr(p, e->param[0]), 0, VARS-1)];
+ case e_isnan: return e->value * !!isnan(eval_expr(p, e->param[0]));
+ case e_isinf: return e->value * !!isinf(eval_expr(p, e->param[0]));
+ case e_floor: return e->value * floor(eval_expr(p, e->param[0]));
+ case e_ceil : return e->value * ceil (eval_expr(p, e->param[0]));
+ case e_trunc: return e->value * trunc(eval_expr(p, e->param[0]));
+ case e_sqrt: return e->value * sqrt (eval_expr(p, e->param[0]));
+ case e_not: return e->value * eval_expr(p, e->param[0]) == 0;
case e_while: {
double d = NAN;
while (eval_expr(p, e->param[0]))
static int parse_expr(AVExpr **e, Parser *p);
-void av_free_expr(AVExpr *e)
+void av_expr_free(AVExpr *e)
{
if (!e) return;
- av_free_expr(e->param[0]);
- av_free_expr(e->param[1]);
+ av_expr_free(e->param[0]);
+ av_expr_free(e->param[1]);
av_freep(&e);
}
if (p->s==NULL) {
av_log(p, AV_LOG_ERROR, "Undefined constant or missing '(' in '%s'\n", s0);
p->s= next;
- av_free_expr(d);
+ av_expr_free(d);
return AVERROR(EINVAL);
}
p->s++; // "("
return ret;
if (p->s[0] != ')') {
av_log(p, AV_LOG_ERROR, "Missing ')' in '%s'\n", s0);
- av_free_expr(d);
+ av_expr_free(d);
return AVERROR(EINVAL);
}
p->s++; // ")"
return 0;
}
if ((ret = parse_expr(&(d->param[0]), p)) < 0) {
- av_free_expr(d);
+ av_expr_free(d);
return ret;
}
if (p->s[0]== ',') {
}
if (p->s[0] != ')') {
av_log(p, AV_LOG_ERROR, "Missing ')' or too many args in '%s'\n", s0);
- av_free_expr(d);
+ av_expr_free(d);
return AVERROR(EINVAL);
}
p->s++; // ")"
else if (strmatch(next, "eq" )) d->type = e_eq;
else if (strmatch(next, "gte" )) d->type = e_gte;
else if (strmatch(next, "gt" )) d->type = e_gt;
- else if (strmatch(next, "lte" )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gt; }
- else if (strmatch(next, "lt" )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gte; }
+ else if (strmatch(next, "lte" )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gte; }
+ else if (strmatch(next, "lt" )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gt; }
else if (strmatch(next, "ld" )) d->type = e_ld;
+ else if (strmatch(next, "isnan" )) d->type = e_isnan;
+ else if (strmatch(next, "isinf" )) d->type = e_isinf;
else if (strmatch(next, "st" )) d->type = e_st;
else if (strmatch(next, "while" )) d->type = e_while;
+ else if (strmatch(next, "floor" )) d->type = e_floor;
+ else if (strmatch(next, "ceil" )) d->type = e_ceil;
+ else if (strmatch(next, "trunc" )) d->type = e_trunc;
+ else if (strmatch(next, "sqrt" )) d->type = e_sqrt;
+ else if (strmatch(next, "not" )) d->type = e_not;
else {
for (i=0; p->func1_names && p->func1_names[i]; i++) {
if (strmatch(next, p->func1_names[i])) {
}
av_log(p, AV_LOG_ERROR, "Unknown function in '%s'\n", s0);
- av_free_expr(d);
+ av_expr_free(d);
return AVERROR(EINVAL);
}
e1 = e0;
p->s++;
if ((ret = parse_pow(&e2, p, &sign2)) < 0) {
- av_free_expr(e1);
+ av_expr_free(e1);
return ret;
}
e0 = new_eval_expr(e_pow, 1, e1, e2);
if (!e0) {
- av_free_expr(e1);
- av_free_expr(e2);
+ av_expr_free(e1);
+ av_expr_free(e2);
return AVERROR(ENOMEM);
}
if (e0->param[1]) e0->param[1]->value *= (sign2|1);
int c= *p->s++;
e1 = e0;
if ((ret = parse_factor(&e2, p)) < 0) {
- av_free_expr(e1);
+ av_expr_free(e1);
return ret;
}
e0 = new_eval_expr(c == '*' ? e_mul : e_div, 1, e1, e2);
if (!e0) {
- av_free_expr(e1);
- av_free_expr(e2);
+ av_expr_free(e1);
+ av_expr_free(e2);
return AVERROR(ENOMEM);
}
}
while (*p->s == '+' || *p->s == '-') {
e1 = e0;
if ((ret = parse_term(&e2, p)) < 0) {
- av_free_expr(e1);
+ av_expr_free(e1);
return ret;
}
e0 = new_eval_expr(e_add, 1, e1, e2);
if (!e0) {
- av_free_expr(e1);
- av_free_expr(e2);
+ av_expr_free(e1);
+ av_expr_free(e2);
return AVERROR(ENOMEM);
}
};
if ((ret = parse_subexpr(&e0, p)) < 0)
return ret;
while (*p->s == ';') {
+ p->s++;
e1 = e0;
if ((ret = parse_subexpr(&e2, p)) < 0) {
- av_free_expr(e1);
+ av_expr_free(e1);
return ret;
}
- p->s++;
e0 = new_eval_expr(e_last, 1, e1, e2);
if (!e0) {
- av_free_expr(e1);
- av_free_expr(e2);
+ av_expr_free(e1);
+ av_expr_free(e2);
return AVERROR(ENOMEM);
}
};
case e_func1:
case e_squish:
case e_ld:
- case e_gauss: return verify_expr(e->param[0]);
+ case e_gauss:
+ case e_isnan:
+ case e_isinf:
+ case e_floor:
+ case e_ceil:
+ case e_trunc:
+ case e_sqrt:
+ case e_not:
+ return verify_expr(e->param[0]);
default: return verify_expr(e->param[0]) && verify_expr(e->param[1]);
}
}
-int av_parse_expr(AVExpr **expr, const char *s,
+int av_expr_parse(AVExpr **expr, const char *s,
const char * const *const_names,
const char * const *func1_names, double (* const *funcs1)(void *, double),
const char * const *func2_names, double (* const *funcs2)(void *, double, double),
int log_offset, void *log_ctx)
{
- Parser p;
+ Parser p = { 0 };
AVExpr *e = NULL;
char *w = av_malloc(strlen(s) + 1);
char *wp = w;
if ((ret = parse_expr(&e, &p)) < 0)
goto end;
if (*p.s) {
+ av_expr_free(e);
av_log(&p, AV_LOG_ERROR, "Invalid chars '%s' at the end of expression '%s'\n", p.s, s0);
ret = AVERROR(EINVAL);
goto end;
}
if (!verify_expr(e)) {
- av_free_expr(e);
+ av_expr_free(e);
ret = AVERROR(EINVAL);
goto end;
}
return ret;
}
-double av_eval_expr(AVExpr *e, const double *const_values, void *opaque)
+double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
{
- Parser p;
+ Parser p = { 0 };
p.const_values = const_values;
p.opaque = opaque;
return eval_expr(&p, e);
}
-int av_parse_and_eval_expr(double *d, const char *s,
+int av_expr_parse_and_eval(double *d, const char *s,
const char * const *const_names, const double *const_values,
const char * const *func1_names, double (* const *funcs1)(void *, double),
const char * const *func2_names, double (* const *funcs2)(void *, double, double),
void *opaque, int log_offset, void *log_ctx)
{
AVExpr *e = NULL;
- int ret = av_parse_expr(&e, s, const_names, func1_names, funcs1, func2_names, funcs2, log_offset, log_ctx);
+ int ret = av_expr_parse(&e, s, const_names, func1_names, funcs1, func2_names, funcs2, log_offset, log_ctx);
if (ret < 0) {
*d = NAN;
return ret;
}
- *d = av_eval_expr(e, const_values, opaque);
- av_free_expr(e);
+ *d = av_expr_eval(e, const_values, opaque);
+ av_expr_free(e);
return isnan(*d) ? AVERROR(EINVAL) : 0;
}
#ifdef TEST
#undef printf
-static double const_values[] = {
+#include <string.h>
+
+static const double const_values[] = {
M_PI,
M_E,
0
};
-static const char *const_names[] = {
+static const char *const const_names[] = {
"PI",
"E",
0
};
-int main(void)
+int main(int argc, char **argv)
{
int i;
double d;
- av_parse_and_eval_expr(&d, "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
+ const char **expr, *exprs[] = {
+ "",
+ "1;2",
+ "-20",
+ "-PI",
+ "+PI",
+ "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
+ "80G/80Gi",
+ "1k",
+ "1Gi",
+ "1gi",
+ "1GiFoo",
+ "1k+1k",
+ "1Gi*3foo",
+ "foo",
+ "foo(",
+ "foo()",
+ "foo)",
+ "sin",
+ "sin(",
+ "sin()",
+ "sin)",
+ "sin 10",
+ "sin(1,2,3)",
+ "sin(1 )",
+ "1",
+ "1foo",
+ "bar + PI + E + 100f*2 + foo",
+ "13k + 12f - foo(1, 2)",
+ "1gi",
+ "1Gi",
+ "st(0, 123)",
+ "st(1, 123); ld(1)",
+ "lte(0, 1)",
+ "lte(1, 1)",
+ "lte(1, 0)",
+ "lt(0, 1)",
+ "lt(1, 1)",
+ "gt(1, 0)",
+ "gt(2, 7)",
+ "gte(122, 122)",
+ /* compute 1+2+...+N */
+ "st(0, 1); while(lte(ld(0), 100), st(1, ld(1)+ld(0));st(0, ld(0)+1)); ld(1)",
+ /* compute Fib(N) */
+ "st(1, 1); st(2, 2); st(0, 1); while(lte(ld(0),10), st(3, ld(1)+ld(2)); st(1, ld(2)); st(2, ld(3)); st(0, ld(0)+1)); ld(3)",
+ "while(0, 10)",
+ "st(0, 1); while(lte(ld(0),100), st(1, ld(1)+ld(0)); st(0, ld(0)+1))",
+ "isnan(1)",
+ "isnan(NAN)",
+ "isnan(INF)",
+ "isinf(1)",
+ "isinf(NAN)",
+ "isinf(INF)",
+ "floor(NAN)",
+ "floor(123.123)",
+ "floor(-123.123)",
+ "trunc(123.123)",
+ "trunc(-123.123)",
+ "ceil(123.123)",
+ "ceil(-123.123)",
+ "sqrt(1764)",
+ "isnan(sqrt(-1))",
+ "not(1)",
+ "not(NAN)",
+ "not(0)",
+ NULL
+ };
+
+ for (expr = exprs; *expr; expr++) {
+ printf("Evaluating '%s'\n", *expr);
+ av_expr_parse_and_eval(&d, *expr,
+ const_names, const_values,
+ NULL, NULL, NULL, NULL, NULL, 0, NULL);
+ if (isnan(d))
+ printf("'%s' -> nan\n\n", *expr);
+ else
+ printf("'%s' -> %f\n\n", *expr, d);
+ }
+
+ av_expr_parse_and_eval(&d, "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
const_names, const_values,
NULL, NULL, NULL, NULL, NULL, 0, NULL);
printf("%f == 12.7\n", d);
- av_parse_and_eval_expr(&d, "80G/80Gi",
+ av_expr_parse_and_eval(&d, "80G/80Gi",
const_names, const_values,
NULL, NULL, NULL, NULL, NULL, 0, NULL);
printf("%f == 0.931322575\n", d);
- for (i=0; i<1050; i++) {
- START_TIMER
- av_parse_and_eval_expr(&d, "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
+ if (argc > 1 && !strcmp(argv[1], "-t")) {
+ for (i = 0; i < 1050; i++) {
+ START_TIMER;
+ av_expr_parse_and_eval(&d, "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
const_names, const_values,
NULL, NULL, NULL, NULL, NULL, 0, NULL);
- STOP_TIMER("av_parse_and_eval_expr")
+ STOP_TIMER("av_expr_parse_and_eval");
+ }
}
+
return 0;
}
#endif
projects / ffmpeg / blobdiff