vf: add function to remove a filter from the chain

2 files changed, 14 insertions, 0 deletions

diff --git a/video/filter/vf.c b/video/filter/vf.c
index 001363b5fb..ecfccedbcd 100644
--- a/video/filter/vf.c
+++ b/video/filter/vf.c
@@ -115,6 +115,8 @@ static const vf_info_t *const filter_list[] = {
     NULL
 };
 
+static void vf_uninit_filter(vf_instance_t *vf);
+
 static bool get_desc(struct m_obj_desc *dst, int index)
 {
     if (index >= MP_ARRAY_SIZE(filter_list) - 1)
@@ -270,6 +272,17 @@ static vf_instance_t *vf_open_filter(struct vf_chain *c, const char *name,
     return vf_open(c, name, args);
 }
 
+void vf_remove_filter(struct vf_chain *c, struct vf_instance *vf)
+{
+    assert(vf != c->first && vf != c->last); // these are sentinels
+    struct vf_instance *prev = c->first;
+    while (prev && prev->next != vf)
+        prev = prev->next;
+    assert(prev); // not inserted
+    prev->next = vf->next;
+    vf_uninit_filter(vf);
+}
+
 struct vf_instance *vf_append_filter(struct vf_chain *c, const char *name,
                                      char **args)
 {
diff --git a/video/filter/vf.h b/video/filter/vf.h
index 4e7832a6e8..a65492134e 100644
--- a/video/filter/vf.h
+++ b/video/filter/vf.h
@@ -134,6 +134,7 @@ struct mp_image *vf_output_queued_frame(struct vf_chain *c);
 void vf_seek_reset(struct vf_chain *c);
 struct vf_instance *vf_append_filter(struct vf_chain *c, const char *name,
                                      char **args);
+void vf_remove_filter(struct vf_chain *c, struct vf_instance *vf);
 int vf_append_filter_list(struct vf_chain *c, struct m_obj_settings *list);
 struct vf_instance *vf_find_by_label(struct vf_chain *c, const char *label);
 void vf_print_filter_chain(struct vf_chain *c, int msglevel);