m_config: allow not allocating option struct, and use it

In cases we're just listing options or checking their values (as it
happens with -vo/-vf etc. suboption parsing), we don't need to allocate
abd initialize the actual option struct. All we're interested in is
the list of options.

1 files changed, 4 insertions, 0 deletions

diff --git a/mpvcore/m_config.h b/mpvcore/m_config.h
index c5d1d35e49..3d82d8cd24 100644
--- a/mpvcore/m_config.h
+++ b/mpvcore/m_config.h
@@ -73,6 +73,7 @@ typedef struct m_config {
 // Create a new config object.
 //  talloc_parent: talloc parent context for the m_config allocation
 //  size: size of the optstruct (where option values are stored)
+//        size==0 creates a config object with no option struct allocated
 //  defaults: if not NULL, points to a struct of same type as optstruct, which
 //            contains default values for all options
 //  options: list of options. Each option defines a member of the optstruct
@@ -86,6 +87,9 @@ struct m_config *m_config_new(void *talloc_parent, size_t size,
 struct m_config *m_config_from_obj_desc(void *talloc_parent,
                                         struct m_obj_desc *desc);
 
+struct m_config *m_config_from_obj_desc_noalloc(void *talloc_parent,
+                                                struct m_obj_desc *desc);
+
 int m_config_set_obj_params(struct m_config *conf, char **args);
 
 // Initialize an object (VO/VF/...) in one go, including legacy handling.