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AVOptions: add functions for evaluating option strings.

This commit is contained in:
Anton Khirnov 2011-08-23 15:02:25 +02:00
parent 059a037fbd
commit dca055be3a
2 changed files with 39 additions and 0 deletions
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15
libavutil/opt.c
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@ -239,6 +239,21 @@ int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
return AVERROR(EINVAL); return AVERROR(EINVAL);
} }
#define OPT_EVAL_NUMBER(name, opttype, vartype)\
int av_opt_eval_ ## name(void *obj, const AVOption *o, const char *val, vartype *name ## _out)\
{\
if (!o || o->type != opttype)\
return AVERROR(EINVAL);\
return set_string_number(obj, o, val, name ## _out);\
}
OPT_EVAL_NUMBER(flags, FF_OPT_TYPE_FLAGS, int)
OPT_EVAL_NUMBER(int, FF_OPT_TYPE_INT, int)
OPT_EVAL_NUMBER(int64, FF_OPT_TYPE_INT64, int64_t)
OPT_EVAL_NUMBER(float, FF_OPT_TYPE_FLOAT, float)
OPT_EVAL_NUMBER(double, FF_OPT_TYPE_DOUBLE, double)
OPT_EVAL_NUMBER(q, FF_OPT_TYPE_RATIONAL, AVRational)
static int set_number(void *obj, const char *name, double num, int den, int64_t intnum, static int set_number(void *obj, const char *name, double num, int den, int64_t intnum,
int search_flags) int search_flags)
{ {

24
libavutil/opt.h
View File

@ -226,6 +226,30 @@ int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name)
*/ */
int av_opt_set_dict(void *obj, struct AVDictionary **options); int av_opt_set_dict(void *obj, struct AVDictionary **options);
/**
* @defgroup opt_eval_funcs Evaluating option strings
* @{
* This group of functions can be used to evaluate option strings
* and get numbers out of them. They do the same thing as av_opt_set(),
* except the result is written into the caller-supplied pointer.
*
* @param obj a struct whose first element is a pointer to AVClass.
* @param o an option for which the string is to be evaluated.
* @param val string to be evaluated.
* @param *_out value of the string will be written here.
*
* @return 0 on success, a negative number on failure.
*/
int av_opt_eval_flags (void *obj, const AVOption *o, const char *val, int *flags_out);
int av_opt_eval_int (void *obj, const AVOption *o, const char *val, int *int_out);
int av_opt_eval_int64 (void *obj, const AVOption *o, const char *val, int64_t *int64_out);
int av_opt_eval_float (void *obj, const AVOption *o, const char *val, float *float_out);
int av_opt_eval_double(void *obj, const AVOption *o, const char *val, double *double_out);
int av_opt_eval_q (void *obj, const AVOption *o, const char *val, AVRational *q_out);
/**
* @}
*/
#define AV_OPT_SEARCH_CHILDREN 0x0001 /**< Search in possible children of the #define AV_OPT_SEARCH_CHILDREN 0x0001 /**< Search in possible children of the
given object first. */ given object first. */
/** /**