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lavfi: add avfilter_get_class() and iteration callbacks

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Allow iteration over filter options.
This commit is contained in:
Stefano Sabatini
2012-08-09 14:59:10 +02:00
parent a25346e65c
commit 5c0d8bc4ce
4 changed files with 46 additions and 1 deletions
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35
libavfilter/avfilter.c
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@@ -432,13 +432,48 @@ static const char *default_filter_name(void *filter_ctx)
return ctx->name ? ctx->name : ctx->filter->name;
}
static void *filter_child_next(void *obj, void *prev)
{
AVFilterContext *ctx = obj;
if (!prev && ctx->filter && ctx->filter->priv_class)
return ctx->priv;
return NULL;
}
static const AVClass *filter_child_class_next(const AVClass *prev)
{
AVFilter **filter_ptr = NULL;
/* find the filter that corresponds to prev */
while (prev && *(filter_ptr = av_filter_next(filter_ptr)))
if ((*filter_ptr)->priv_class == prev)
break;
/* could not find filter corresponding to prev */
if (prev && !(*filter_ptr))
return NULL;
/* find next filter with specific options */
while (*(filter_ptr = av_filter_next(filter_ptr)))
if ((*filter_ptr)->priv_class)
return (*filter_ptr)->priv_class;
return NULL;
}
static const AVClass avfilter_class = {
.class_name = "AVFilter",
.item_name = default_filter_name,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_FILTER,
.child_next = filter_child_next,
.child_class_next = filter_child_class_next,
};
const AVClass *avfilter_get_class(void)
{
return &avfilter_class;
}
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
{
AVFilterContext *ret;