diff --git a/spa/include/spa/port.h b/spa/include/spa/port.h
index c6f896a1f..a78969d4a 100644
--- a/spa/include/spa/port.h
+++ b/spa/include/spa/port.h
@@ -28,6 +28,7 @@ typedef struct _SpaAllocParam SpaAllocParam;
 
 #include <spa/defs.h>
 #include <spa/buffer.h>
+#include <spa/dict.h>
 
 #define SPA_ALLOC_PARAM_URI             "http://spaplug.in/ns/alloc-param"
 #define SPA_ALLOC_PARAM_PREFIX          SPA_ALLOC_PARAM_URI "#"
@@ -110,7 +111,7 @@ typedef enum {
  * @latency: latency on this port in nanoseconds
  * @params: extra allocation parameters
  * @n_params: number of elements in @params;
- * @features: NULL terminated array of extra port features
+ * @extra: a dictionary of extra port info
  *
  */
 typedef struct {
@@ -119,7 +120,7 @@ typedef struct {
   uint64_t            latency;
   SpaAllocParam     **params;
   unsigned int        n_params;
-  const char        **features;
+  SpaDict            *extra;
 } SpaPortInfo;
 
 
diff --git a/spa/include/spa/props.h b/spa/include/spa/props.h
index 71be620dd..5b4622fbc 100644
--- a/spa/include/spa/props.h
+++ b/spa/include/spa/props.h
@@ -136,7 +136,7 @@ typedef struct {
  * @range_type: type of the range values
  * @n_range_values: number of elements in @range_values
  * @range_values: array of possible values
- * @info: extra info
+ * @extra: extra info
  */
 typedef struct {
   uint32_t                  id;
@@ -148,7 +148,7 @@ typedef struct {
   SpaPropRangeType          range_type;
   unsigned int              n_range_values;
   const SpaPropRangeInfo   *range_values;
-  SpaDict                  *info;
+  SpaDict                  *extra;
 } SpaPropInfo;
 
 /**
diff --git a/spa/lib/debug.c b/spa/lib/debug.c
index 2cad5ac31..dc5b10d99 100644
--- a/spa/lib/debug.c
+++ b/spa/lib/debug.c
@@ -432,9 +432,9 @@ spa_debug_props (const SpaProps *props, bool print_ranges)
         fprintf (stderr, "\t: %-12s\n", rinfo->name);
       }
     }
-    if (info->info) {
-      fprintf (stderr, "Info:  \n");
-      spa_debug_dict (info->info);
+    if (info->extra) {
+      fprintf (stderr, "Extra info:  \n");
+      spa_debug_dict (info->extra);
     }
   }
   return SPA_RESULT_OK;
diff --git a/spa/lib/port.c b/spa/lib/port.c
index 2687c5d18..a1d0a0273 100644
--- a/spa/lib/port.c
+++ b/spa/lib/port.c
@@ -62,7 +62,7 @@ spa_port_info_serialize (void *p, const SpaPortInfo *info)
     pi->params = SPA_INT_TO_PTR (SPA_PTRDIFF (ap, pi));
   else
     pi->params = 0;
-  pi->features = 0;
+  pi->extra = 0;
 
   p = SPA_MEMBER (ap, sizeof (SpaAllocParam*) * info->n_params, void);
 
diff --git a/spa/plugins/alsa/alsa-sink.c b/spa/plugins/alsa/alsa-sink.c
index 9daf3585c..0e22b6943 100644
--- a/spa/plugins/alsa/alsa-sink.c
+++ b/spa/plugins/alsa/alsa-sink.c
@@ -341,7 +341,7 @@ spa_alsa_sink_node_port_set_format (SpaNode            *node,
   this->param_buffers.min_buffers = 1;
   this->param_buffers.max_buffers = 8;
   this->param_buffers.align = 16;
-  this->info.features = NULL;
+  this->info.extra = NULL;
 
   this->have_format = true;
   update_state (this, SPA_NODE_STATE_READY);
diff --git a/spa/plugins/alsa/alsa-source.c b/spa/plugins/alsa/alsa-source.c
index 418aada09..a9e1d80e2 100644
--- a/spa/plugins/alsa/alsa-source.c
+++ b/spa/plugins/alsa/alsa-source.c
@@ -375,7 +375,7 @@ spa_alsa_source_node_port_set_format (SpaNode            *node,
   this->param_meta.param.type = SPA_ALLOC_PARAM_TYPE_META_ENABLE;
   this->param_meta.param.size = sizeof (this->param_meta);
   this->param_meta.type = SPA_META_TYPE_HEADER;
-  this->info.features = NULL;
+  this->info.extra = NULL;
 
   this->have_format = true;
 
diff --git a/spa/plugins/audiotestsrc/audiotestsrc.c b/spa/plugins/audiotestsrc/audiotestsrc.c
index d43fa9ee3..047d6cb87 100644
--- a/spa/plugins/audiotestsrc/audiotestsrc.c
+++ b/spa/plugins/audiotestsrc/audiotestsrc.c
@@ -583,7 +583,7 @@ spa_audiotestsrc_node_port_set_format (SpaNode            *node,
     this->param_meta.param.type = SPA_ALLOC_PARAM_TYPE_META_ENABLE;
     this->param_meta.param.size = sizeof (this->param_meta);
     this->param_meta.type = SPA_META_TYPE_HEADER;
-    this->info.features = NULL;
+    this->info.extra = NULL;
     update_state (this, SPA_NODE_STATE_READY);
   }
   else
diff --git a/spa/plugins/v4l2/v4l2-utils.c b/spa/plugins/v4l2/v4l2-utils.c
index c9d251a81..722c3c3f1 100644
--- a/spa/plugins/v4l2/v4l2-utils.c
+++ b/spa/plugins/v4l2/v4l2-utils.c
@@ -816,7 +816,7 @@ spa_v4l2_set_format (SpaV4l2Source *this, V4l2Format *f, bool try_only)
   state->param_meta.param.size = sizeof (state->param_meta);
   state->param_meta.type = SPA_META_TYPE_HEADER;
 
-  state->info.features = NULL;
+  state->info.extra = NULL;
 
   return 0;
 }
diff --git a/spa/plugins/videotestsrc/videotestsrc.c b/spa/plugins/videotestsrc/videotestsrc.c
index 4583568f1..5eb6afb65 100644
--- a/spa/plugins/videotestsrc/videotestsrc.c
+++ b/spa/plugins/videotestsrc/videotestsrc.c
@@ -532,7 +532,7 @@ spa_videotestsrc_node_port_set_format (SpaNode            *node,
     this->param_meta.param.type = SPA_ALLOC_PARAM_TYPE_META_ENABLE;
     this->param_meta.param.size = sizeof (this->param_meta);
     this->param_meta.type = SPA_META_TYPE_HEADER;
-    this->info.features = NULL;
+    this->info.extra = NULL;
     update_state (this, SPA_NODE_STATE_READY);
   }
   else