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avutil/opt: add full support for AV_OPT_TYPE_DICT

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Now it is possible to set them from a string, to serialize them and to use a
default value.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint
2019-12-24 00:19:47 +01:00
parent 6c883e214a
commit 5edacc4609
2 changed files with 53 additions and 8 deletions
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10
libavutil/opt.h
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@@ -670,6 +670,9 @@ const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *pre
* scalars or named flags separated by '+' or '-'. Prefixing a flag
* with '+' causes it to be set without affecting the other flags;
* similarly, '-' unsets a flag.
* If the field is of a dictionary type, it has to be a ':' separated list of
* key=value parameters. Values containing ':' special characters must be
* escaped.
* @param search_flags flags passed to av_opt_find2. I.e. if AV_OPT_SEARCH_CHILDREN
* is passed here, then the option may be set on a child of obj.
*
@@ -730,9 +733,10 @@ int av_opt_set_dict_val(void *obj, const char *name, const AVDictionary *val, in
/**
* @note the returned string will be av_malloc()ed and must be av_free()ed by the caller
*
* @note if AV_OPT_ALLOW_NULL is set in search_flags in av_opt_get, and the option has
* AV_OPT_TYPE_STRING or AV_OPT_TYPE_BINARY and is set to NULL, *out_val will be set
* to NULL instead of an allocated empty string.
* @note if AV_OPT_ALLOW_NULL is set in search_flags in av_opt_get, and the
* option is of type AV_OPT_TYPE_STRING, AV_OPT_TYPE_BINARY or AV_OPT_TYPE_DICT
* and is set to NULL, *out_val will be set to NULL instead of an allocated
* empty string.
*/
int av_opt_get (void *obj, const char *name, int search_flags, uint8_t **out_val);
int av_opt_get_int (void *obj, const char *name, int search_flags, int64_t *out_val);