analyticsmeta: Make the GstAnalyticsRelatableMtdData struct private

Only ask the subclass about how much space they need, this way we can keep
the allocation details more private.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5863>

girs/GstAnalytics-1.0.gir

@@ -284,42 +284,6 @@ Quark of the class of object associated with this location.</doc>
         <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h">Only use for criteria.</doc>
       </member>
     </bitfield>
-    <record name="RelatableMtdData" c:type="GstAnalyticsRelatableMtdData" version="1.24">
-      <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h">Base structure for analysis-metadata that can be placed in relation. Only
-other analysis-metadata based on GstAnalyticsRelatableMtdData should
-directly use this structure.</doc>
-      <source-position filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h"/>
-      <field name="analysis_type" writable="1">
-        <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h">Identify the type of analysis-metadata</doc>
-        <type name="MtdType" c:type="GstAnalyticsMtdType"/>
-      </field>
-      <field name="id" writable="1">
-        <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h">Instance identifier.</doc>
-        <type name="guint" c:type="guint"/>
-      </field>
-      <field name="size" writable="1">
-        <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h">Size in bytes of the instance</doc>
-        <type name="gsize" c:type="gsize"/>
-      </field>
-      <field name="free">
-        <callback name="free">
-          <source-position filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h"/>
-          <return-value transfer-ownership="none">
-            <type name="none" c:type="void"/>
-          </return-value>
-          <parameters>
-            <parameter name="mtd_data" transfer-ownership="none">
-              <type name="RelatableMtdData" c:type="GstAnalyticsRelatableMtdData*"/>
-            </parameter>
-          </parameters>
-        </callback>
-      </field>
-      <field name="_gst_reserved" writable="1">
-        <array zero-terminated="0" fixed-size="4">
-          <type name="gpointer" c:type="gpointer"/>
-        </array>
-      </field>
-    </record>
     <record name="RelationMeta" c:type="GstAnalyticsRelationMeta" disguised="1">
       <source-position filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h"/>
       <method name="add_cls_mtd" c:identifier="gst_analytics_relation_meta_add_cls_mtd" version="1.24">
@@ -362,11 +326,11 @@ directly use this structure.</doc>
         <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.c">Add a relatable metadata to @meta. This method is meant to be used by
 new struct sub-classing GstAnalyticsRelatableMtd.</doc>
         <source-position filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h"/>
-        <return-value>
+        <return-value transfer-ownership="none" nullable="1">
-          <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.c">New GstAnalyticsRelatableMtdData instance.
+          <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.c">A pointer to a memory area of size @size where to put the data
 
 Since 1.24</doc>
-          <type name="RelatableMtdData" c:type="GstAnalyticsRelatableMtdData*"/>
+          <type name="gpointer" c:type="gpointer"/>
         </return-value>
         <parameters>
           <instance-parameter name="meta" transfer-ownership="none">
@@ -631,11 +595,11 @@ Since 1.24</doc>
       </method>
       <method name="get_mtd_data" c:identifier="gst_analytics_relation_meta_get_mtd_data" introspectable="0">
         <source-position filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h"/>
-        <return-value nullable="1">
+        <return-value transfer-ownership="none" nullable="1">
-          <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.c">Instance of GstAnalyticsRelatableMtdData
+          <doc xml:space="preserve" filename="../subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.c">Analytics data pointer
 
 Since 1.24</doc>
-          <type name="RelatableMtdData" c:type="GstAnalyticsRelatableMtdData*"/>
+          <type name="gpointer" c:type="gpointer"/>
         </return-value>
         <parameters>
           <instance-parameter name="meta" transfer-ownership="none">

subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsclassificationmtd.c

@@ -39,7 +39,6 @@ struct _GstAnalyticsClsConfLvlAndClass
 
 /*
  * GstAnalyticsClsMtd:
- * @parent: parent
  * @length: classes and confidence levels count
  * @class_quarks: (array length=length): Array of quark representing a class
  * @confidence_levels: (array length=length): Array of confidence levels for
@@ -49,25 +48,10 @@ struct _GstAnalyticsClsConfLvlAndClass
  */
 struct _GstAnalyticsClsMtdData
 {
-  GstAnalyticsRelatableMtdData parent;
   gsize length;
   GstAnalyticsClsConfLvlAndClass confidence_levels_and_classes[];       // Must be last
 };
 
-
-static GstAnalyticsClsMtdData *
-gst_analytics_cls_mtd_get_data (GstAnalyticsClsMtd * instance)
-{
-  GstAnalyticsRelatableMtdData *rlt_data =
-      gst_analytics_relation_meta_get_mtd_data (instance->meta,
-      instance->id);
-  g_return_val_if_fail (rlt_data, NULL);
-  g_return_val_if_fail (rlt_data->analysis_type ==
-      gst_analytics_cls_mtd_get_type_quark (), NULL);
-
-  return (GstAnalyticsClsMtdData *) rlt_data;
-}
-
 /**
  * gst_analytics_cls_mtd_get_type_quark:
  * Get a quark identifying #GstAnalyticsMtd type.
@@ -113,7 +97,8 @@ gst_analytics_cls_mtd_get_level (GstAnalyticsClsMtd * handle, gint index)
   g_return_val_if_fail (index >= 0, -1.0);
   g_return_val_if_fail (handle->meta != NULL, -1.0);
   GstAnalyticsClsMtdData *cls_mtd_data;
-  cls_mtd_data = gst_analytics_cls_mtd_get_data (handle);
+  cls_mtd_data = gst_analytics_relation_meta_get_mtd_data (handle->meta,
+      handle->id);
   g_return_val_if_fail (cls_mtd_data != NULL, -1.0);
   g_return_val_if_fail (cls_mtd_data->length > index, -1.0);
   return cls_mtd_data->confidence_levels_and_classes[index].confidence_levels;
@@ -136,7 +121,8 @@ gst_analytics_cls_mtd_get_index_by_quark (GstAnalyticsClsMtd * handle,
   g_return_val_if_fail (handle, -1);
 
   GstAnalyticsClsMtdData *cls_mtd_data;
-  cls_mtd_data = gst_analytics_cls_mtd_get_data (handle);
+  cls_mtd_data = gst_analytics_relation_meta_get_mtd_data (handle->meta,
+      handle->id);
   g_return_val_if_fail (cls_mtd_data != NULL, -1);
 
   for (gint i = 0; i < cls_mtd_data->length; i++) {
@@ -159,7 +145,8 @@ gsize
 gst_analytics_cls_mtd_get_length (GstAnalyticsClsMtd * handle)
 {
   GstAnalyticsClsMtdData *cls_mtd_data;
-  cls_mtd_data = gst_analytics_cls_mtd_get_data (handle);
+  cls_mtd_data = gst_analytics_relation_meta_get_mtd_data (handle->meta,
+      handle->id);
   g_return_val_if_fail (cls_mtd_data != NULL, 0);
   return cls_mtd_data->length;
 }
@@ -178,7 +165,8 @@ gst_analytics_cls_mtd_get_quark (GstAnalyticsClsMtd * handle, gint index)
 {
   GstAnalyticsClsMtdData *cls_mtd_data;
   g_return_val_if_fail (handle, 0);
-  cls_mtd_data = gst_analytics_cls_mtd_get_data (handle);
+  cls_mtd_data = gst_analytics_relation_meta_get_mtd_data (handle->meta,
+      handle->id);
   g_return_val_if_fail (cls_mtd_data != NULL, 0);
   return cls_mtd_data->confidence_levels_and_classes[index].class;
 }

subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.c

@@ -27,68 +27,24 @@
 GST_DEBUG_CATEGORY_STATIC (an_relation_meta_debug);
 #define GST_CAT_AN_RELATION an_relation_meta_debug
 
-static char invalid_type_name[] = "_invalid";
+/*
-
+ * GstAnalyticsRelatableMtdData:
-static guint
+ * @analysis_type: Identify the type of analysis-metadata
-gst_analytics_relation_meta_get_next_id (GstAnalyticsRelationMeta * meta);
+ * @id: Instance identifier.
-
+ * @size: Size in bytes of the instance
-/**
- * gst_analytics_mtd_get_type_quark:
- * @instance: Instance of #GstAnalyticsMtd
- * Get analysis result type.
  *
- * Returns: quark associated with type.
+ * Base structure for analysis-metadata that can be placed in relation. Only
- *
+ * other analysis-metadata based on GstAnalyticsRelatableMtdDatax should
- * Since: 1.24
+ * directly use this structure.
  */
-GstAnalyticsMtdType
+typedef struct
-gst_analytics_mtd_get_type_quark (GstAnalyticsMtd * handle)
 {
-  GstAnalyticsRelatableMtdData *rlt;
+  GstAnalyticsMtdType analysis_type;
-  rlt = gst_analytics_relation_meta_get_mtd_data (handle->meta, handle->id);
+  guint id;
+  gsize size;
+  gpointer data[];
+} GstAnalyticsRelatableMtdData;
 
-  g_return_val_if_fail (rlt != NULL,
-      g_quark_from_static_string (invalid_type_name));
-
-  return rlt->analysis_type;
-}
-
-/**
- * gst_analytics_mtd_get_id:
- * @instance: Instance of #GstAnalyticsMtd
- * Get instance id
- *
- * Returns: Id of @instance
- *
- * Since: 1.24
- */
-guint
-gst_analytics_mtd_get_id (GstAnalyticsMtd * handle)
-{
-  return handle->id;
-}
-
-/**
- * gst_analytics_mtd_get_size:
- * @instance Instance of #GstAnalyticsRelatableMtd
- * Get instance size
- *
- * Returns: Size (in bytes) of this instance or 0 on failure.
- *
- * Since: 1.24
- */
-gsize
-gst_analytics_mtd_get_size (GstAnalyticsMtd * handle)
-{
-  GstAnalyticsRelatableMtdData *rlt;
-  rlt = gst_analytics_relation_meta_get_mtd_data (handle->meta, handle->id);
-  if (rlt == NULL) {
-    GST_CAT_ERROR (GST_CAT_AN_RELATION, "Invalid parameter");
-    return 0;
-  }
-
-  return rlt->size;
-}
 
 /*
  * GstAnalyticsRelationMeta:
@@ -132,6 +88,89 @@ typedef struct _GstAnalyticsRelationMeta
 
 } GstAnalyticsRelationMeta;
 
+static char invalid_type_name[] = "_invalid";
+
+static guint
+gst_analytics_relation_meta_get_next_id (GstAnalyticsRelationMeta * meta);
+
+
+static GstAnalyticsRelatableMtdData *
+gst_analytics_relation_meta_get_mtd_data_internal (GstAnalyticsRelationMeta *
+    meta, guint an_meta_id)
+{
+  GstAnalyticsRelatableMtdData *rv;
+  g_return_val_if_fail (meta, NULL);
+  if (an_meta_id >= meta->rel_order) {
+    GST_CAT_ERROR (GST_CAT_AN_RELATION, "Invalid parameter");
+    return NULL;
+  }
+  rv = (GstAnalyticsRelatableMtdData *)
+      (meta->mtd_data_lookup[an_meta_id] + meta->analysis_results);
+
+  return rv;
+}
+
+/**
+ * gst_analytics_mtd_get_type_quark:
+ * @instance: Instance of #GstAnalyticsMtd
+ * Get analysis result type.
+ *
+ * Returns: quark associated with type.
+ *
+ * Since: 1.24
+ */
+GstAnalyticsMtdType
+gst_analytics_mtd_get_type_quark (GstAnalyticsMtd * handle)
+{
+  GstAnalyticsRelatableMtdData *rlt;
+  rlt = gst_analytics_relation_meta_get_mtd_data_internal (handle->meta,
+      handle->id);
+
+  g_return_val_if_fail (rlt != NULL,
+      g_quark_from_static_string (invalid_type_name));
+
+  return rlt->analysis_type;
+}
+
+/**
+ * gst_analytics_mtd_get_id:
+ * @instance: Instance of #GstAnalyticsMtd
+ * Get instance id
+ *
+ * Returns: Id of @instance
+ *
+ * Since: 1.24
+ */
+guint
+gst_analytics_mtd_get_id (GstAnalyticsMtd * handle)
+{
+  return handle->id;
+}
+
+/**
+ * gst_analytics_mtd_get_size:
+ * @instance Instance of #GstAnalyticsRelatableMtd
+ * Get instance size
+ *
+ * Returns: Size (in bytes) of this instance or 0 on failure.
+ *
+ * Since: 1.24
+ */
+gsize
+gst_analytics_mtd_get_size (GstAnalyticsMtd * handle)
+{
+  GstAnalyticsRelatableMtdData *rlt;
+  rlt = gst_analytics_relation_meta_get_mtd_data_internal (handle->meta,
+      handle->id);
+  if (rlt == NULL) {
+    GST_CAT_ERROR (GST_CAT_AN_RELATION, "Invalid parameter");
+    return 0;
+  }
+
+  return rlt->size;
+}
+
+
 /**
  * gst_analytics_relation_get_length:
  * @instance Instance of #GstAnalyticsRelationMeta
@@ -256,21 +295,11 @@ static void
 gst_analytics_relation_meta_free (GstMeta * meta, GstBuffer * buffer)
 {
   GstAnalyticsRelationMeta *rmeta = (GstAnalyticsRelationMeta *) meta;
-  gpointer state = NULL;
+
-  GstAnalyticsMtd mtd;
-  GstAnalyticsRelatableMtdData *data;
   GST_CAT_TRACE (GST_CAT_AN_RELATION,
       "Content analysis meta-data(%p) freed for buffer(%p)",
       (gpointer) rmeta, (gpointer) buffer);
 
-  /* call custom free function if set */
-  while (gst_analytics_relation_meta_iterate (rmeta, &state, 0, &mtd)) {
-    data = gst_analytics_relation_meta_get_mtd_data (mtd.meta, mtd.id);
-    if (data->free != NULL) {
-      data->free (data);
-    }
-  }
-
   g_free (rmeta->analysis_results);
   g_free (rmeta->adj_mat);
   g_free (rmeta->mtd_data_lookup);
@@ -779,15 +808,16 @@ gst_buffer_get_analytics_relation_meta (GstBuffer * buffer)
  * Add a relatable metadata to @meta. This method is meant to be used by
  * new struct sub-classing GstAnalyticsRelatableMtd.
  *
- * Returns: New GstAnalyticsRelatableMtdData instance.
+ * Returns: A pointer to a memory area of size @size where to put the data
  *
  * Since 1.24
  */
-GstAnalyticsRelatableMtdData *
+gpointer
 gst_analytics_relation_meta_add_mtd (GstAnalyticsRelationMeta * meta,
     GstAnalyticsMtdType type, gsize size, GstAnalyticsMtd * rlt_mtd)
 {
-  gsize new_size = size + meta->offset;
+  gsize object_size;
+  gsize new_size;
   GstAnalyticsRelatableMtdData *dest = NULL;
   gpointer mem;
   guint8 **new_adj_mat;
@@ -795,6 +825,12 @@ gst_analytics_relation_meta_add_mtd (GstAnalyticsRelationMeta * meta,
   GST_CAT_TRACE (GST_CAT_AN_RELATION, "Adding relatable metadata to rmeta %p",
       meta);
 
+  object_size = sizeof (GstAnalyticsRelatableMtdData);
+  object_size += sizeof (gpointer) * (size / sizeof (gpointer));
+  if (size % sizeof (gpointer))
+    object_size += sizeof (gpointer);
+  new_size = meta->offset + object_size;
+
   if (new_size > meta->max_size) {
 
     if (new_size > meta->max_size_increment + meta->offset) {
@@ -827,9 +863,8 @@ gst_analytics_relation_meta_add_mtd (GstAnalyticsRelationMeta * meta,
     dest->analysis_type = type;
     dest->id = gst_analytics_relation_meta_get_next_id (meta);
     dest->size = size;
-    dest->free = NULL;
     meta->mtd_data_lookup[dest->id] = meta->offset;
-    meta->offset += dest->size;
+    meta->offset += object_size;
     meta->length++;
     rlt_mtd->id = dest->id;
     rlt_mtd->meta = meta;
@@ -841,7 +876,7 @@ gst_analytics_relation_meta_add_mtd (GstAnalyticsRelationMeta * meta,
         "Failed to add relatable, out-of-space (%" G_GSIZE_FORMAT " / %"
         G_GSIZE_FORMAT ").", new_size, meta->max_size);
   }
-  return dest;
+  return &dest->data[0];
 }
 
 /**
@@ -876,7 +911,7 @@ gst_analytics_relation_meta_get_mtd (GstAnalyticsRelationMeta * meta,
     return FALSE;
   }
 
-  d = gst_analytics_relation_meta_get_mtd_data (meta, an_meta_id);
+  d = gst_analytics_relation_meta_get_mtd_data_internal (meta, an_meta_id);
   if (d == NULL)
     return FALSE;
 
@@ -899,23 +934,17 @@ gst_analytics_relation_meta_get_mtd (GstAnalyticsRelationMeta * meta,
  * @meta: Instance of GstAnalyticsRelationMeta
  * @an_meta_id: Id of GstAnalyticsMtd instance to retrieve
  *
- * Returns:(nullable): Instance of GstAnalyticsRelatableMtdData
+ * Returns:(nullable): Analytics data pointer
  *
  * Since 1.24
  */
-GstAnalyticsRelatableMtdData *
+gpointer
 gst_analytics_relation_meta_get_mtd_data (GstAnalyticsRelationMeta *
     meta, guint an_meta_id)
 {
-  GstAnalyticsRelatableMtdData *rv;
+  GstAnalyticsRelatableMtdData *rv =
-  g_return_val_if_fail (meta, NULL);
+      gst_analytics_relation_meta_get_mtd_data_internal (meta, an_meta_id);
-  if (an_meta_id >= meta->rel_order) {
+  return &rv->data[0];
-    GST_CAT_ERROR (GST_CAT_AN_RELATION, "Invalid parameter");
-    return NULL;
-  }
-  rv = (GstAnalyticsRelatableMtdData *)
-      (meta->mtd_data_lookup[an_meta_id] + meta->analysis_results);
-  return rv;
 }
 
 

subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsmeta.h

@@ -56,7 +56,6 @@ typedef guint32 GstAnalyticsMtdType;
 #define GST_ANALYTICS_MTD_CAST(mtd) \
     ((GstAnalyticsMtd *)(mtd))
 
-typedef struct _GstAnalyticsRelatableMtdData GstAnalyticsRelatableMtdData;
 typedef struct _GstAnalyticsRelationMeta GstAnalyticsRelationMeta;
 
 /**
@@ -76,29 +75,6 @@ struct _GstAnalyticsMtd
   GstAnalyticsRelationMeta *meta;
 };
 
-/**
- * GstAnalyticsRelatableMtdData:
- * @analysis_type: Identify the type of analysis-metadata
- * @id: Instance identifier.
- * @size: Size in bytes of the instance
- *
- * Base structure for analysis-metadata that can be placed in relation. Only
- * other analysis-metadata based on GstAnalyticsRelatableMtdData should
- * directly use this structure.
- *
- * Since: 1.24
- */
-struct _GstAnalyticsRelatableMtdData
-{
-  GstAnalyticsMtdType analysis_type;
-  guint id;
-  gsize size;
-
-  void (*free) (GstAnalyticsRelatableMtdData * mtd_data);
-
-  gpointer _gst_reserved[GST_PADDING];
-};
-
 GST_ANALYTICS_META_API
 GstAnalyticsMtdType gst_analytics_mtd_get_type_quark (GstAnalyticsMtd * instance);
 
@@ -196,7 +172,7 @@ GstAnalyticsRelationMeta *
 gst_buffer_get_analytics_relation_meta (GstBuffer * buffer);
 
 GST_ANALYTICS_META_API
-GstAnalyticsRelatableMtdData *
+gpointer
 gst_analytics_relation_meta_add_mtd (GstAnalyticsRelationMeta * meta,
     GstAnalyticsMtdType type, gsize size, GstAnalyticsMtd * rlt_mtd);
 
@@ -206,7 +182,7 @@ gst_analytics_relation_meta_get_mtd (GstAnalyticsRelationMeta *
     meta, guint an_meta_id, GstAnalyticsMtdType type, GstAnalyticsMtd * rlt);
 
 GST_ANALYTICS_META_API
-GstAnalyticsRelatableMtdData *
+gpointer
 gst_analytics_relation_meta_get_mtd_data (GstAnalyticsRelationMeta * meta,
     guint an_meta_id);
 

subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsobjectdetectionmtd.c

@@ -32,7 +32,6 @@ typedef struct _GstAnalyticsODMtdData GstAnalyticsODMtdData;
 
 /**
  * GstAnalyticsODMtdData:
- * @parent: parent #GstAnalyticsMtd
  * @object_type: Type of object
  * @x: x component of upper-left corner
  * @y: y component of upper-left corner
@@ -46,7 +45,6 @@ typedef struct _GstAnalyticsODMtdData GstAnalyticsODMtdData;
  */
 struct _GstAnalyticsODMtdData
 {
-  GstAnalyticsRelatableMtdData parent;
   GQuark object_type;
   gint x;
   gint y;
@@ -84,19 +82,6 @@ gst_analytics_od_mtd_get_type_name (void)
   return GST_RELATABLE_MTD_OD_TYPE_NAME;
 }
 
-static GstAnalyticsODMtdData *
-gst_analytics_od_mtd_get_data (GstAnalyticsODMtd * instance)
-{
-  GstAnalyticsRelatableMtdData *rlt_data =
-      gst_analytics_relation_meta_get_mtd_data (instance->meta,
-      instance->id);
-  g_return_val_if_fail (rlt_data, NULL);
-  g_return_val_if_fail (rlt_data->analysis_type ==
-      gst_analytics_od_mtd_get_type_quark (), NULL);
-
-  return (GstAnalyticsODMtdData *) rlt_data;
-}
-
 /**
  * gst_analytics_od_mtd_get_location:
  * @instance: instance
@@ -117,21 +102,20 @@ gboolean
 gst_analytics_od_mtd_get_location (GstAnalyticsODMtd * instance,
     gint * x, gint * y, gint * w, gint * h, gfloat * loc_conf_lvl)
 {
-  g_return_val_if_fail (instance && x && y && w && h, FALSE);
   GstAnalyticsODMtdData *data;
-  data = gst_analytics_od_mtd_get_data (instance);
+
+  g_return_val_if_fail (instance && x && y && w && h, FALSE);
+  data = gst_analytics_relation_meta_get_mtd_data (instance->meta,
+      instance->id);
   g_return_val_if_fail (data != NULL, FALSE);
 
-  if (data) {
   *x = data->x;
   *y = data->y;
   *w = data->w;
   *h = data->h;
 
-    if (loc_conf_lvl) {
+  if (loc_conf_lvl)
     *loc_conf_lvl = data->location_confidence_lvl;
-    }
-  }
 
   return TRUE;
 }
@@ -149,7 +133,8 @@ gst_analytics_od_mtd_get_type (GstAnalyticsODMtd * handle)
 {
   GstAnalyticsODMtdData *data;
   g_return_val_if_fail (handle != NULL, 0);
-  data = gst_analytics_od_mtd_get_data (handle);
+  data = gst_analytics_relation_meta_get_mtd_data (handle->meta,
+      handle->id);
   g_return_val_if_fail (data != NULL, 0);
   return data->object_type;
 }

subprojects/gst-plugins-bad/gst-libs/gst/analytics/gstanalyticsobjecttrackingmtd.c

@@ -30,7 +30,6 @@ typedef struct _GstAnalyticsTrackingMtdData GstAnalyticsTrackingMtdData;
 
 /**
  * GstAnalyticsTrackingMtd:
- * @parent: parent #GstAnalyticsMtd
  * @tracking_id: Tracking identifier
  * @tracking_first_seen: Tracking creation time
  * @tracking_last_seen: Tracking last observation
@@ -42,7 +41,6 @@ typedef struct _GstAnalyticsTrackingMtdData GstAnalyticsTrackingMtdData;
  */
 struct _GstAnalyticsTrackingMtdData
 {
-  GstAnalyticsRelatableMtdData parent;
   guint64 tracking_id;
   GstClockTime tracking_first_seen;
   GstClockTime tracking_last_seen;
@@ -52,20 +50,6 @@ struct _GstAnalyticsTrackingMtdData
 
 static char type[] = GST_RELATABLE_MTD_TRACKING_TYPE_NAME;
 
-static GstAnalyticsTrackingMtdData *
-gst_analytics_tracking_mtd_get_data (GstAnalyticsTrackingMtd * instance)
-{
-  GstAnalyticsRelatableMtdData *rlt_data =
-      gst_analytics_relation_meta_get_mtd_data (instance->meta,
-      instance->id);
-  g_return_val_if_fail (rlt_data, NULL);
-
-  g_return_val_if_fail (rlt_data->analysis_type ==
-      gst_analytics_tracking_mtd_get_type_quark (), NULL);
-
-  return (GstAnalyticsTrackingMtdData *) rlt_data;
-}
-
 /**
  * gst_analytics_tracking_mtd_get_type_quark:
  * Returns: Quark representing the type of GstAnalyticsRelatableMtd
@@ -107,7 +91,8 @@ gst_analytics_tracking_mtd_update_last_seen (GstAnalyticsTrackingMtd * instance,
 {
   GstAnalyticsTrackingMtdData *trk_mtd_data;
   g_return_val_if_fail (instance, FALSE);
-  trk_mtd_data = gst_analytics_tracking_mtd_get_data (instance);
+  trk_mtd_data = gst_analytics_relation_meta_get_mtd_data (instance->meta,
+      instance->id);
   g_return_val_if_fail (trk_mtd_data != NULL, FALSE);
 
   trk_mtd_data->tracking_last_seen = last_seen;
@@ -128,7 +113,8 @@ gst_analytics_tracking_mtd_set_lost (GstAnalyticsTrackingMtd * instance)
 {
   GstAnalyticsTrackingMtdData *trk_mtd_data;
   g_return_val_if_fail (instance, FALSE);
-  trk_mtd_data = gst_analytics_tracking_mtd_get_data (instance);
+  trk_mtd_data = gst_analytics_relation_meta_get_mtd_data (instance->meta,
+      instance->id);
   g_return_val_if_fail (trk_mtd_data != NULL, FALSE);
   trk_mtd_data->tracking_lost = TRUE;
   return TRUE;
@@ -154,7 +140,8 @@ gst_analytics_tracking_mtd_get_info (GstAnalyticsTrackingMtd * instance,
 {
   GstAnalyticsTrackingMtdData *trk_mtd_data;
   g_return_val_if_fail (instance, FALSE);
-  trk_mtd_data = gst_analytics_tracking_mtd_get_data (instance);
+  trk_mtd_data = gst_analytics_relation_meta_get_mtd_data (instance->meta,
+      instance->id);
 
   g_return_val_if_fail (trk_mtd_data != NULL, FALSE);