@@ -692,6 +692,7 @@ static int default_execute(AVFilterContext *ctx, avfilter_action_func *func, voi
AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
{
AVFilterContext *ret;
+ int preinited = 0;
if (!filter)
return NULL;
@@ -708,6 +709,11 @@ AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
if (!ret->priv)
goto err;
}
+ if (filter->preinit) {
+ if (filter->preinit(ret) < 0)
+ goto err;
+ preinited = 1;
+ }
av_opt_set_defaults(ret);
if (filter->priv_class) {
@@ -745,6 +751,8 @@ AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
return ret;
err:
+ if (preinited)
+ filter->uninit(ret);
av_freep(&ret->inputs);
av_freep(&ret->input_pads);
ret->nb_inputs = 0;
@@ -195,6 +195,21 @@ typedef struct AVFilter {
*/
/**
+ * Filter pre-initialization function
+ *
+ * This callback will be called immediately after the filter context is
+ * allocated, to allow allocating and initing sub-objects.
+ *
+ * If this callback is not NULL, the uninit callback will be called on
+ * allocation failure.
+ *
+ * @return 0 on success,
+ * AVERROR code on failure (but the code will be
+ * dropped and treated as ENOMEM by the calling code)
+ */
+ int (*preinit)(AVFilterContext *ctx);
+
+ /**
* Filter initialization function.
*
* This callback will be called only once during the filter lifetime, after
It is necessary for filters with child objects, to set the class and default options values. Signed-off-by: Nicolas George <george@nsup.org> --- libavfilter/avfilter.c | 8 ++++++++ libavfilter/avfilter.h | 15 +++++++++++++++ 2 files changed, 23 insertions(+)