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Change the order of parameters for ff_eval_expr() and

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ff_parse_and_eval_expr(), place the names for constants/functions
before the corresponding values.

This looks more readable, as the user is expected to know the names
before the values.

Originally committed as revision 23149 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2010-05-16 23:00:22 +00:00
parent ec1d1afc09
commit edd259f92f
5 changed files with 30 additions and 26 deletions
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2
libavcodec/avcodec.h
View File

@ -31,7 +31,7 @@
#define LIBAVCODEC_VERSION_MAJOR 52
#define LIBAVCODEC_VERSION_MINOR 67
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_MICRO 1
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \

22
libavcodec/eval.c
View File

@ -369,9 +369,10 @@ static int verify_expr(AVExpr * e) {
}
}
AVExpr *ff_parse_expr(const char *s, const char * const *const_name,
double (* const *func1)(void *, double), const char * const *func1_name,
double (* const *func2)(void *, double, double), const char * const *func2_name,
AVExpr *ff_parse_expr(const char *s,
const char * const *const_name,
const char * const *func1_name, double (* const *func1)(void *, double),
const char * const *func2_name, double (* const *func2)(void *, double, double),
const char **error){
Parser p;
AVExpr *e = NULL;
@ -412,11 +413,12 @@ double ff_eval_expr(AVExpr * e, const double *const_value, void *opaque) {
return eval_expr(&p, e);
}
double ff_parse_and_eval_expr(const char *s, const double *const_value, const char * const *const_name,
double (* const *func1)(void *, double), const char * const *func1_name,
double (* const *func2)(void *, double, double), const char * const *func2_name,
double ff_parse_and_eval_expr(const char *s,
const char * const *const_name, const double *const_value,
const char * const *func1_name, double (* const *func1)(void *, double),
const char * const *func2_name, double (* const *func2)(void *, double, double),
void *opaque, const char **error){
AVExpr * e = ff_parse_expr(s, const_name, func1, func1_name, func2, func2_name, error);
AVExpr *e = ff_parse_expr(s, const_name, func1_name, func1, func2_name, func2, error);
double d;
if (!e) return NAN;
d = ff_eval_expr(e, const_value, opaque);
@ -438,12 +440,12 @@ static const char *const_names[]={
};
int main(void){
int i;
printf("%f == 12.7\n", ff_parse_and_eval_expr("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_values, const_names, NULL, NULL, NULL, NULL, NULL, NULL));
printf("%f == 0.931322575\n", ff_parse_and_eval_expr("80G/80Gi", const_values, const_names, NULL, NULL, NULL, NULL, NULL, NULL));
printf("%f == 12.7\n", ff_parse_and_eval_expr("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_names, const_values, NULL, NULL, NULL, NULL, NULL, NULL));
printf("%f == 0.931322575\n", ff_parse_and_eval_expr("80G/80Gi", const_names, const_values, NULL, NULL, NULL, NULL, NULL, NULL));
for(i=0; i<1050; i++){
START_TIMER
ff_parse_and_eval_expr("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_values, const_names, NULL, NULL, NULL, NULL, NULL, NULL);
ff_parse_and_eval_expr("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_names, const_values, NULL, NULL, NULL, NULL, NULL, NULL);
STOP_TIMER("ff_parse_and_eval_expr")
}
return 0;

28
libavcodec/eval.h
View File

@ -33,37 +33,39 @@ typedef struct AVExpr AVExpr;
* Note, this is significantly slower than ff_eval_expr().
*
* @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
* @param func1 NULL terminated array of function pointers for functions which take 1 argument
* @param func2 NULL terminated array of function pointers for functions which take 2 arguments
* @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
* @param func1_name NULL terminated array of zero terminated strings of func1 identifers
* @param func2_name NULL terminated array of zero terminated strings of func2 identifers
* @param error pointer to a char* which is set to an error message if something goes wrong
* @param const_value a zero terminated array of values for the identifers from const_name
* @param func1_name NULL terminated array of zero terminated strings of func1 identifers
* @param func1 NULL terminated array of function pointers for functions which take 1 argument
* @param func2_name NULL terminated array of zero terminated strings of func2 identifers
* @param func2 NULL terminated array of function pointers for functions which take 2 arguments
* @param error pointer to a char* which is set to an error message if something goes wrong
* @param opaque a pointer which will be passed to all functions from func1 and func2
* @return the value of the expression
*/
double ff_parse_and_eval_expr(const char *s, const double *const_value, const char * const *const_name,
double (* const *func1)(void *, double), const char * const *func1_name,
double (* const *func2)(void *, double, double), const char * const *func2_name,
double ff_parse_and_eval_expr(const char *s,
const char * const *const_name, const double *const_value,
const char * const *func1_name, double (* const *func1)(void *, double),
const char * const *func2_name, double (* const *func2)(void *, double, double),
void *opaque, const char **error);
/**
* Parses an expression.
*
* @param s expression as a zero terminated string for example "1+2^3+5*5+sin(2/3)"
* @param func1 NULL terminated array of function pointers for functions which take 1 argument
* @param func2 NULL terminated array of function pointers for functions which take 2 arguments
* @param const_name NULL terminated array of zero terminated strings of constant identifers for example {"PI", "E", 0}
* @param func1_name NULL terminated array of zero terminated strings of func1 identifers
* @param func1 NULL terminated array of function pointers for functions which take 1 argument
* @param func2_name NULL terminated array of zero terminated strings of func2 identifers
* @param func2 NULL terminated array of function pointers for functions which take 2 arguments
* @param error pointer to a char* which is set to an error message if something goes wrong
* @return AVExpr which must be freed with ff_free_expr() by the user when it is not needed anymore
* NULL if anything went wrong
*/
AVExpr *ff_parse_expr(const char *s, const char * const *const_name,
double (* const *func1)(void *, double), const char * const *func1_name,
double (* const *func2)(void *, double, double), const char * const *func2_name,
AVExpr *ff_parse_expr(const char *s,
const char * const *const_name,
const char * const *func1_name, double (* const *func1)(void *, double),
const char * const *func2_name, double (* const *func2)(void *, double, double),
const char **error);
/**

2
libavcodec/opt.c
View File

@ -156,7 +156,7 @@ int av_set_string3(void *obj, const char *name, const char *val, int alloc, cons
buf[i]= val[i];
buf[i]=0;
d = ff_parse_and_eval_expr(buf, const_values, const_names, NULL, NULL, NULL, NULL, NULL, &error);
d = ff_parse_and_eval_expr(buf, const_names, const_values, NULL, NULL, NULL, NULL, NULL, &error);
if(isnan(d)) {
const AVOption *o_named= av_find_opt(obj, buf, o->unit, 0, 0);
if(o_named && o_named->type == FF_OPT_TYPE_CONST)

2
libavcodec/ratecontrol.c
View File

@ -107,7 +107,7 @@ int ff_rate_control_init(MpegEncContext *s)
};
emms_c();
rcc->rc_eq_eval = ff_parse_expr(s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp", const_names, func1, func1_names, NULL, NULL, &error);
rcc->rc_eq_eval = ff_parse_expr(s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp", const_names, func1_names, func1, NULL, NULL, &error);
if (!rcc->rc_eq_eval) {
av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\": %s\n", s->avctx->rc_eq, error? error : "");
return -1;