*/
int ff_framesync_dualinput_get_writable(FFFrameSync *fs, AVFrame **f0, AVFrame **f1);
+const AVClass *ff_framesync_child_class_iterate(void **iter);
+
#define FRAMESYNC_DEFINE_CLASS(name, context, field) \
static int name##_framesync_preinit(AVFilterContext *ctx) { \
context *s = ctx->priv; \
.version = LIBAVUTIL_VERSION_INT, \
.category = AV_CLASS_CATEGORY_FILTER, \
.child_class_next = name##_child_class_next, \
+ .child_class_iterate = ff_framesync_child_class_iterate, \
.child_next = name##_child_next, \
}