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AVOptions: add new API for enumerating children.

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This will allow the caller to enumerate child contexts in a generic way
and since the API is recursive, it also allows for deeper nesting (e.g.
AVFormatContext->AVIOContext->URLContext)

This will also allow the new setting/reading API to transparently apply
to children contexts.
This commit is contained in:
Anton Khirnov
2011-10-03 19:49:12 +02:00
parent 1bca8f4bc5
commit 641c7afe3c
5 changed files with 141 additions and 41 deletions
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48
libavutil/opt.c
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@ -583,22 +583,60 @@ int av_opt_set_dict(void *obj, AVDictionary **options)
const AVOption *av_opt_find(void *obj, const char *name, const char *unit,
int opt_flags, int search_flags)
{
AVClass *c = *(AVClass**)obj;
return av_opt_find2(obj, name, unit, opt_flags, search_flags, NULL);
}
const AVOption *av_opt_find2(void *obj, const char *name, const char *unit,
int opt_flags, int search_flags, void **target_obj)
{
const AVClass *c = *(AVClass**)obj;
const AVOption *o = NULL;
if (c->opt_find && search_flags & AV_OPT_SEARCH_CHILDREN &&
(o = c->opt_find(obj, name, unit, opt_flags, search_flags)))
return o;
if (search_flags & AV_OPT_SEARCH_CHILDREN) {
if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {
const AVClass *child = NULL;
while (child = av_opt_child_class_next(c, child))
if (o = av_opt_find2(&child, name, unit, opt_flags, search_flags, NULL))
return o;
} else {
void *child = NULL;
while (child = av_opt_child_next(obj, child))
if (o = av_opt_find2(child, name, unit, opt_flags, search_flags, target_obj))
return o;
}
}
while (o = av_next_option(obj, o)) {
if (!strcmp(o->name, name) && (o->flags & opt_flags) == opt_flags &&
((!unit && o->type != FF_OPT_TYPE_CONST) ||
(unit && o->unit && !strcmp(o->unit, unit))))
(unit && o->unit && !strcmp(o->unit, unit)))) {
if (target_obj) {
if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))
*target_obj = obj;
else
*target_obj = NULL;
}
return o;
}
}
return NULL;
}
void *av_opt_child_next(void *obj, void *prev)
{
const AVClass *c = *(AVClass**)obj;
if (c->child_next)
return c->child_next(obj, prev);
return NULL;
}
const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev)
{
if (parent->child_class_next)
return parent->child_class_next(prev);
return NULL;
}
#ifdef TEST
#undef printf