lv2: extract helper code into lv2utils

This is a preparaton for adding lv2-sources and -sinks.

4 files changed, 608 insertions, 421 deletions

diff --git a/ext/lv2/Makefile.am b/ext/lv2/Makefile.am
index 0c320e3cd..3903c8d0f 100644
--- a/ext/lv2/Makefile.am
+++ b/ext/lv2/Makefile.am
@@ -1,6 +1,6 @@
 plugin_LTLIBRARIES = libgstlv2.la
 
-libgstlv2_la_SOURCES = gstlv2.c gstlv2filter.c
+libgstlv2_la_SOURCES = gstlv2.c gstlv2utils.c gstlv2filter.c
 libgstlv2_la_CFLAGS = \
 	-I$(top_srcdir)/gst-libs \
 	$(GST_AUDIO_CFLAGS) \
@@ -15,4 +15,4 @@ libgstlv2_la_LIBADD = \
 libgstlv2_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 libgstlv2_la_LIBTOOLFLAGS = $(GST_PLUGIN_LIBTOOLFLAGS)
 
-noinst_HEADERS = gstlv2.h
+noinst_HEADERS = gstlv2.h gstlv2utils.h
diff --git a/ext/lv2/gstlv2filter.c b/ext/lv2/gstlv2filter.c
index 5e8c1128c..4dcc7ad28 100644
--- a/ext/lv2/gstlv2filter.c
+++ b/ext/lv2/gstlv2filter.c
@@ -24,6 +24,7 @@
 #include "config.h"
 #endif
 #include "gstlv2.h"
+#include "gstlv2utils.h"
 
 #include <string.h>
 #include <math.h>
@@ -51,58 +52,20 @@ typedef struct _lv2_control_info
 
 typedef struct _GstLV2Filter GstLV2Filter;
 typedef struct _GstLV2FilterClass GstLV2FilterClass;
-typedef struct _GstLV2FilterGroup GstLV2FilterGroup;
-typedef struct _GstLV2FilterPort GstLV2FilterPort;
 
 
 struct _GstLV2Filter
 {
   GstAudioFilter parent;
 
-  LilvPlugin *plugin;
-  LilvInstance *instance;
-
-  gboolean activated;
-
-  /* TODO refactor in the same way as LADSPA plugin */
-  struct
-  {
-    struct
-    {
-      gfloat *in;
-      gfloat *out;
-    } control;
-  } ports;
-};
-
-struct _GstLV2FilterGroup
-{
-  gchar *uri; /**< RDF resource (URI or blank node) */
-  guint pad; /**< Gst pad index */
-  gchar *symbol; /**< Gst pad name / LV2 group symbol */
-  GArray *ports; /**< Array of GstLV2FilterPort */
-  gboolean has_roles; /**< TRUE iff all ports have a known role */
-};
-
-struct _GstLV2FilterPort
-{
-  gint index; /**< LV2 port index (on LV2 plugin) */
-  gint pad; /**< Gst pad index (iff not part of a group) */
-  LilvNode *role; /**< Channel position / port role */
-  GstAudioChannelPosition position; /**< Channel position */
+  GstLV2 lv2;
 };
 
 struct _GstLV2FilterClass
 {
   GstAudioFilterClass parent_class;
 
-  LilvPlugin *plugin;
-
-  GstLV2FilterGroup in_group; /**< Array of GstLV2FilterGroup */
-  GstLV2FilterGroup out_group; /**< Array of GstLV2FilterGroup */
-  GArray *control_in_ports; /**< Array of GstLV2FilterPort */
-  GArray *control_out_ports; /**< Array of GstLV2FilterPort */
-
+  GstLV2Class lv2;
 };
 
 static GstAudioFilter *parent_class = NULL;
@@ -112,70 +75,28 @@ static void
 gst_lv2_filter_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
 {
-  GstLV2Filter *self = (GstLV2Filter *) (object);
-  GstLV2FilterClass *klass =
-      (GstLV2FilterClass *) GST_AUDIO_FILTER_GET_CLASS (object);
-
-  /* remember, properties have an offset of 1 */
-  prop_id--;
-
-  /* only input ports */
-  g_return_if_fail (prop_id < klass->control_in_ports->len);
-
-  /* now see what type it is */
-  switch (pspec->value_type) {
-    case G_TYPE_BOOLEAN:
-      self->ports.control.in[prop_id] =
-          g_value_get_boolean (value) ? 0.0f : 1.0f;
-      break;
-    case G_TYPE_INT:
-      self->ports.control.in[prop_id] = g_value_get_int (value);
-      break;
-    case G_TYPE_FLOAT:
-      self->ports.control.in[prop_id] = g_value_get_float (value);
-      break;
-    default:
-      g_assert_not_reached ();
-  }
+  GstLV2Filter *self = (GstLV2Filter *) object;
+
+  gst_lv2_object_set_property (&self->lv2, object, prop_id, value, pspec);
 }
 
 static void
 gst_lv2_filter_get_property (GObject * object, guint prop_id, GValue * value,
     GParamSpec * pspec)
 {
-  GstLV2Filter *self = (GstLV2Filter *) (object);
-  GstLV2FilterClass *klass =
-      (GstLV2FilterClass *) GST_AUDIO_FILTER_GET_CLASS (object);
-
-  gfloat *controls;
-
-  /* remember, properties have an offset of 1 */
-  prop_id--;
-
-  if (prop_id < klass->control_in_ports->len) {
-    controls = self->ports.control.in;
-  } else if (prop_id < klass->control_in_ports->len +
-      klass->control_out_ports->len) {
-    controls = self->ports.control.out;
-    prop_id -= klass->control_in_ports->len;
-  } else {
-    g_return_if_reached ();
-  }
+  GstLV2Filter *self = (GstLV2Filter *) object;
 
-  /* now see what type it is */
-  switch (pspec->value_type) {
-    case G_TYPE_BOOLEAN:
-      g_value_set_boolean (value, controls[prop_id] > 0.0f);
-      break;
-    case G_TYPE_INT:
-      g_value_set_int (value, CLAMP (controls[prop_id], G_MININT, G_MAXINT));
-      break;
-    case G_TYPE_FLOAT:
-      g_value_set_float (value, controls[prop_id]);
-      break;
-    default:
-      g_return_if_reached ();
-  }
+  gst_lv2_object_get_property (&self->lv2, object, prop_id, value, pspec);
+}
+
+static void
+gst_lv2_filter_finalize (GObject * object)
+{
+  GstLV2Filter *self = (GstLV2Filter *) object;
+
+  gst_lv2_finalize (&self->lv2);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
 }
 
 #if 0
@@ -229,7 +150,7 @@ gst_lv2_filter_role_to_position (LilvNode * role)
 }
 
 static GstAudioChannelPosition *
-gst_lv2_filter_build_positions (GstLV2FilterGroup * group)
+gst_lv2_filter_build_positions (GstLV2Group * group)
 {
   GstAudioChannelPosition *positions = NULL;
 
@@ -239,7 +160,7 @@ gst_lv2_filter_build_positions (GstLV2FilterGroup * group)
 
     positions = g_new (GstAudioChannelPosition, group->ports->len);
     for (i = 0; i < group->ports->len; ++i)
-      positions[i] = g_array_index (group->ports, GstLV2FilterPort, i).position;
+      positions[i] = g_array_index (group->ports, GstLV2Port, i).position;
   }
   return positions;
 }
@@ -255,9 +176,9 @@ gst_lv2_filter_type_class_add_pad_templates (GstLV2FilterClass * klass)
 
   gint in_channels = 1, out_channels = 1;
 
-  in_channels = klass->in_group.ports->len;
+  in_channels = klass->lv2.in_group.ports->len;
 
-  out_channels = klass->out_group.ports->len;
+  out_channels = klass->lv2.out_group.ports->len;
 
   /* FIXME Implement deintereleaved audio support */
   sinkcaps = gst_caps_new_simple ("audio/x-raw",
@@ -289,44 +210,22 @@ gst_lv2_filter_type_class_add_pad_templates (GstLV2FilterClass * klass)
 static gboolean
 gst_lv2_filter_setup (GstAudioFilter * gsp, const GstAudioInfo * info)
 {
-  GstLV2Filter *self;
-  GstLV2FilterClass *oclass;
-  GstAudioFilterClass *audiofilter_class;
-  gint i;
-
-  audiofilter_class = GST_AUDIO_FILTER_GET_CLASS (gsp);
-  self = (GstLV2Filter *) gsp;
-  oclass = (GstLV2FilterClass *) audiofilter_class;
+  GstLV2Filter *self = (GstLV2Filter *) gsp;
 
-  g_return_val_if_fail (self->activated == FALSE, FALSE);
+  g_return_val_if_fail (self->lv2.activated == FALSE, FALSE);
 
   GST_DEBUG_OBJECT (self, "instantiating the plugin at %d Hz",
       GST_AUDIO_INFO_RATE (info));
 
-  if (self->instance)
-    lilv_instance_free (self->instance);
-
-  if (!(self->instance =
-          lilv_plugin_instantiate (oclass->plugin, GST_AUDIO_INFO_RATE (info),
-              NULL)))
+  if (!gst_lv2_setup (&self->lv2, GST_AUDIO_INFO_RATE (info)))
     goto no_instance;
 
-  /* connect the control ports */
-  for (i = 0; i < oclass->control_in_ports->len; i++)
-    lilv_instance_connect_port (self->instance,
-        g_array_index (oclass->control_in_ports, GstLV2FilterPort, i).index,
-        &(self->ports.control.in[i]));
-
-  for (i = 0; i < oclass->control_out_ports->len; i++)
-    lilv_instance_connect_port (self->instance,
-        g_array_index (oclass->control_out_ports, GstLV2FilterPort, i).index,
-        &(self->ports.control.out[i]));
-
   /* FIXME Handle audio channel positionning while negotiating CAPS */
 #if 0
+  gint i;
   /* set input group pad audio channel position */
-  for (i = 0; i < oclass->in_groups->len; ++i) {
-    group = &g_array_index (oclass->in_groups, GstLV2FilterGroup, i);
+  for (i = 0; i < oclass->lv2.in_groups->len; ++i) {
+    group = &g_array_index (oclass->lv2.in_groups, GstLV2Group, i);
     if (group->has_roles) {
       if ((positions = gst_lv2_filter_build_positions (group))) {
         if ((pad = gst_element_get_static_pad (GST_ELEMENT (gsp),
@@ -343,8 +242,8 @@ gst_lv2_filter_setup (GstAudioFilter * gsp, const GstAudioInfo * info)
     }
   }
   /* set output group pad audio channel position */
-  for (i = 0; i < oclass->out_groups->len; ++i) {
-    group = &g_array_index (oclass->out_groups, GstLV2FilterGroup, i);
+  for (i = 0; i < oclass->lv2.out_groups->len; ++i) {
+    group = &g_array_index (oclass->lv2.out_groups, GstLV2Group, i);
     if (group->has_roles) {
       if ((positions = gst_lv2_filter_build_positions (group))) {
         if ((pad = gst_element_get_static_pad (GST_ELEMENT (gsp),
@@ -362,9 +261,6 @@ gst_lv2_filter_setup (GstAudioFilter * gsp, const GstAudioInfo * info)
   }
 #endif
 
-  lilv_instance_activate (self->instance);
-  self->activated = TRUE;
-
   return TRUE;
 
 no_instance:
@@ -379,28 +275,7 @@ gst_lv2_filter_stop (GstBaseTransform * transform)
 {
   GstLV2Filter *lv2 = (GstLV2Filter *) transform;
 
-  if (lv2->activated == FALSE) {
-      GST_ERROR_OBJECT (transform, "Deactivating but LV2 plugin not activated");
-
-      return TRUE;
-  }
-
-  if (lv2->instance == NULL) {
-      GST_ERROR_OBJECT (transform, "Deactivating but no LV2 plugin set");
-
-      return TRUE;
-  }
-
-  GST_DEBUG_OBJECT (lv2, "deactivating");
-
-  lilv_instance_deactivate (lv2->instance);
-
-  lv2->activated = FALSE;
-
-  lilv_instance_free (lv2->instance);
-  lv2->instance = NULL;
-
-  return TRUE;
+  return gst_lv2_cleanup (&lv2->lv2, (GstObject *) lv2);
 }
 
 static inline void
@@ -430,51 +305,50 @@ static GstFlowReturn
 gst_lv2_filter_transform_data (GstLV2Filter * self,
     GstMapInfo * in_map, GstMapInfo * out_map)
 {
-  GstAudioFilterClass *audiofilter_class;
   GstLV2FilterClass *lv2_class;
-  GstLV2FilterGroup *lv2_group;
-  GstLV2FilterPort *lv2_port;
+  GstLV2Group *lv2_group;
+  GstLV2Port *lv2_port;
   guint j, nframes, samples, out_samples;
-
   gfloat *in = NULL, *out = NULL;
 
   nframes = in_map->size / sizeof (float);
 
-  audiofilter_class = GST_AUDIO_FILTER_GET_CLASS (self);
-  lv2_class = (GstLV2FilterClass *) audiofilter_class;
-
-  samples = nframes / lv2_class->in_group.ports->len;
+  lv2_class = (GstLV2FilterClass *) GST_AUDIO_FILTER_GET_CLASS (self);
 
   /* multi channel inputs */
-  lv2_group = &lv2_class->in_group;
-
+  lv2_group = &lv2_class->lv2.in_group;
+  samples = nframes / lv2_group->ports->len;
   in = g_new0 (gfloat, nframes);
+  GST_INFO ("in : samples=%u, nframes=%u, ports=%d", samples, nframes,
+      lv2_group->ports->len);
 
   if (lv2_group->ports->len > 1)
-      gst_lv2_filter_deinterleave_data (lv2_group->ports->len, in,
-          samples, (gfloat *) in_map->data);
+    gst_lv2_filter_deinterleave_data (lv2_group->ports->len, in,
+        samples, (gfloat *) in_map->data);
 
   for (j = 0; j < lv2_group->ports->len; ++j) {
-    lv2_port = &g_array_index (lv2_group->ports, GstLV2FilterPort, j);
-
-    lilv_instance_connect_port (self->instance, lv2_port->index,
+    lv2_port = &g_array_index (lv2_group->ports, GstLV2Port, j);
+    lilv_instance_connect_port (self->lv2.instance, lv2_port->index,
         in + (j * samples));
   }
 
-  lv2_group = &lv2_class->out_group;
+  /* multi channel outputs */
+  lv2_group = &lv2_class->lv2.out_group;
   out_samples = nframes / lv2_group->ports->len;
   out = g_new0 (gfloat, samples * lv2_group->ports->len);
+  GST_INFO ("out: samples=%u, nframes=%u, ports=%d", out_samples, nframes,
+      lv2_group->ports->len);
   for (j = 0; j < lv2_group->ports->len; ++j) {
-    lv2_port = &g_array_index (lv2_group->ports, GstLV2FilterPort, j);
-    lilv_instance_connect_port (self->instance, lv2_port->index,
+    lv2_port = &g_array_index (lv2_group->ports, GstLV2Port, j);
+    lilv_instance_connect_port (self->lv2.instance, lv2_port->index,
         out + (j * out_samples));
   }
 
-  lilv_instance_run (self->instance, samples);
+  lilv_instance_run (self->lv2.instance, samples);
 
   if (lv2_group->ports->len > 1)
-      gst_lv2_filter_interleave_data (lv2_group->ports->len,
-          (gfloat *) out_map->data, out_samples, out);
+    gst_lv2_filter_interleave_data (lv2_group->ports->len,
+        (gfloat *) out_map->data, out_samples, out);
   g_free (out);
   g_free (in);
 
@@ -520,276 +394,51 @@ gst_lv2_filter_base_init (gpointer g_class)
 {
   GstLV2FilterClass *klass = (GstLV2FilterClass *) g_class;
   GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
-  LilvPlugin *lv2plugin;
-  LilvNode *val;
-  /* FIXME Handle channels positionning
-   * GstAudioChannelPosition position = GST_AUDIO_CHANNEL_POSITION_INVALID; */
-  guint j, in_pad_index = 0, out_pad_index = 0;
-  gchar *longname, *author;
-
-  lv2plugin = (LilvPlugin *) g_type_get_qdata (G_OBJECT_CLASS_TYPE (klass),
-      descriptor_quark);
-
-  g_assert (lv2plugin);
-
-  GST_INFO ("base_init %p, plugin %s", g_class,
-      lilv_node_get_turtle_token (lilv_plugin_get_uri (lv2plugin)));
-
-  klass->in_group.ports = g_array_new (FALSE, TRUE, sizeof (GstLV2FilterPort));
-  klass->out_group.ports = g_array_new (FALSE, TRUE, sizeof (GstLV2FilterPort));
-  klass->control_in_ports =
-      g_array_new (FALSE, TRUE, sizeof (GstLV2FilterPort));
-  klass->control_out_ports =
-      g_array_new (FALSE, TRUE, sizeof (GstLV2FilterPort));
-
-  /* find ports and groups */
-  for (j = 0; j < lilv_plugin_get_num_ports (lv2plugin); j++) {
-    const LilvPort *port = lilv_plugin_get_port_by_index (lv2plugin, j);
-    const gboolean is_input = lilv_port_is_a (lv2plugin, port, input_class);
-    struct _GstLV2FilterPort desc = { j, 0, };
-    LilvNodes *lv2group = lilv_port_get (lv2plugin, port, group_pred);
-
-    if (lv2group) {
-      /* port is part of a group */
-      const gchar *group_uri = lilv_node_as_uri (lv2group);
-      GstLV2FilterGroup *group =
-          is_input ? &klass->in_group : &klass->out_group;
-
-      if (group->uri == NULL) {
-        group->uri = g_strdup (group_uri);
-        group->pad = is_input ? in_pad_index++ : out_pad_index++;
-        group->ports = g_array_new (FALSE, TRUE, sizeof (GstLV2FilterPort));
-      }
-
-      /* FIXME Handle channels positionning
-         position = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
-         sub_values = lilv_port_get_value (lv2plugin, port, has_role_pred);
-         if (lilv_nodes_size (sub_values) > 0) {
-         LilvNode *role = lilv_nodes_get_at (sub_values, 0);
-         position = gst_lv2_filter_role_to_position (role);
-         }
-         lilv_nodes_free (sub_values);
-
-         if (position != GST_AUDIO_CHANNEL_POSITION_INVALID) {
-         desc.position = position;
-         } */
-
-      g_array_append_val (group->ports, desc);
-    } else {
-      /* port is not part of a group, or it is part of a group but that group
-       * is illegal so we just ignore it */
-      if (lilv_port_is_a (lv2plugin, port, audio_class)) {
-
-        desc.pad = is_input ? in_pad_index++ : out_pad_index++;
-        if (is_input)
-          g_array_append_val (klass->in_group.ports, desc);
-        else
-          g_array_append_val (klass->out_group.ports, desc);
-      } else if (lilv_port_is_a (lv2plugin, port, control_class)) {
-        if (is_input)
-          g_array_append_val (klass->control_in_ports, desc);
-        else
-          g_array_append_val (klass->control_out_ports, desc);
-      } else {
-        /* unknown port type */
-        GST_INFO ("unhandled port %d", j);
-        continue;
-      }
-    }
-  }
-  gst_lv2_filter_type_class_add_pad_templates (klass);
-
-  val = lilv_plugin_get_name (lv2plugin);
-  if (val) {
-    longname = g_strdup (lilv_node_as_string (val));
-    lilv_node_free (val);
-  } else {
-    longname = g_strdup ("no description available");
-  }
-  val = lilv_plugin_get_author_name (lv2plugin);
-  if (val) {
-    author = g_strdup (lilv_node_as_string (val));
-    lilv_node_free (val);
-  } else {
-    author = g_strdup ("no author available");
-  }
-
-  gst_element_class_set_metadata (element_class, longname,
-      "Filter/Effect/Audio/LV2", longname, author);
-  g_free (longname);
-  g_free (author);
-
-  klass->plugin = lv2plugin;
-}
-
-static gchar *
-gst_lv2_filter_class_get_param_name (GstLV2FilterClass * klass,
-    const LilvPort * port)
-{
-  LilvPlugin *lv2plugin = klass->plugin;
-  gchar *ret;
-
-  ret = g_strdup (lilv_node_as_string (lilv_port_get_symbol (lv2plugin, port)));
 
-  /* this is the same thing that param_spec_* will do */
-  g_strcanon (ret, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-", '-');
-  /* satisfy glib2 (argname[0] must be [A-Za-z]) */
-  if (!((ret[0] >= 'a' && ret[0] <= 'z') || (ret[0] >= 'A' && ret[0] <= 'Z'))) {
-    gchar *tempstr = ret;
+  gst_lv2_class_init (&klass->lv2, G_TYPE_FROM_CLASS (klass));
 
-    ret = g_strconcat ("param-", ret, NULL);
-    g_free (tempstr);
-  }
-
-  /* check for duplicate property names */
-  if (g_object_class_find_property (G_OBJECT_CLASS (klass), ret)) {
-    gint n = 1;
-    gchar *nret = g_strdup_printf ("%s-%d", ret, n++);
-
-    while (g_object_class_find_property (G_OBJECT_CLASS (klass), nret)) {
-      g_free (nret);
-      nret = g_strdup_printf ("%s-%d", ret, n++);
-    }
-    g_free (ret);
-    ret = nret;
-  }
-
-  GST_DEBUG ("built property name '%s' from port name '%s'", ret,
-      lilv_node_as_string (lilv_port_get_symbol (lv2plugin, port)));
-
-  return ret;
-}
-
-static gchar *
-gst_lv2_filter_class_get_param_nick (GstLV2FilterClass * klass,
-    const LilvPort * port)
-{
-  LilvPlugin *lv2plugin = klass->plugin;
+  gst_lv2_element_class_set_metadata (&klass->lv2, element_class,
+      "Filter/Effect/Audio/LV2");
 
-  return g_strdup (lilv_node_as_string (lilv_port_get_name (lv2plugin, port)));
+  gst_lv2_filter_type_class_add_pad_templates (klass);
 }
 
-static GParamSpec *
-gst_lv2_filter_class_get_param_spec (GstLV2FilterClass * klass, gint portnum)
+static void
+gst_lv2_filter_base_finalize (GstLV2FilterClass * lv2_class)
 {
-  LilvPlugin *lv2plugin = klass->plugin;
-  const LilvPort *port = lilv_plugin_get_port_by_index (lv2plugin, portnum);
-  LilvNode *lv2def, *lv2min, *lv2max;
-  GParamSpec *ret;
-  gchar *name, *nick;
-  gint perms;
-  gfloat lower = 0.0f, upper = 1.0f, def = 0.0f;
-
-  nick = gst_lv2_filter_class_get_param_nick (klass, port);
-  name = gst_lv2_filter_class_get_param_name (klass, port);
-
-  GST_DEBUG ("%s trying port %s : %s",
-      lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), name, nick);
-
-  perms = G_PARAM_READABLE;
-  if (lilv_port_is_a (lv2plugin, port, input_class))
-    perms |= G_PARAM_WRITABLE | G_PARAM_CONSTRUCT;
-  if (lilv_port_is_a (lv2plugin, port, control_class))
-    perms |= GST_PARAM_CONTROLLABLE;
-
-  if (lilv_port_has_property (lv2plugin, port, toggled_prop)) {
-    ret = g_param_spec_boolean (name, nick, nick, FALSE, perms);
-    goto done;
-  }
-
-  lilv_port_get_range (lv2plugin, port, &lv2def, &lv2min, &lv2max);
-
-  if (lv2def)
-    def = lilv_node_as_float (lv2def);
-  if (lv2min)
-    lower = lilv_node_as_float (lv2min);
-  if (lv2max)
-    upper = lilv_node_as_float (lv2max);
-
-  lilv_node_free (lv2def);
-  lilv_node_free (lv2min);
-  lilv_node_free (lv2max);
-
-  if (def < lower) {
-    GST_WARNING ("%s has lower bound %f > default %f",
-        lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), lower, def);
-    lower = def;
-  }
-
-  if (def > upper) {
-    GST_WARNING ("%s has upper bound %f < default %f",
-        lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), upper, def);
-    upper = def;
-  }
-
-  if (lilv_port_has_property (lv2plugin, port, integer_prop))
-    ret = g_param_spec_int (name, nick, nick, lower, upper, def, perms);
-  else
-    ret = g_param_spec_float (name, nick, nick, lower, upper, def, perms);
-
-done:
-  g_free (name);
-  g_free (nick);
-
-  return ret;
+  gst_lv2_class_finalize (&lv2_class->lv2);
 }
 
 static void
 gst_lv2_filter_class_init (GstLV2FilterClass * klass, LilvPlugin * lv2plugin)
 {
-  GObjectClass *gobject_class;
-  GstBaseTransformClass *transform_class;
-  GstAudioFilterClass *audiofilter_class;
-  GParamSpec *p;
-  gint i, ix;
+  GObjectClass *gobject_class = (GObjectClass *) klass;
+  GstBaseTransformClass *transform_class = GST_BASE_TRANSFORM_CLASS (klass);
+  GstAudioFilterClass *audiofilter_class = GST_AUDIO_FILTER_CLASS (klass);
 
   GST_DEBUG ("class_init %p", klass);
 
-  gobject_class = (GObjectClass *) klass;
   gobject_class->set_property = gst_lv2_filter_set_property;
   gobject_class->get_property = gst_lv2_filter_get_property;
+  gobject_class->finalize = gst_lv2_filter_finalize;
 
-  audiofilter_class = GST_AUDIO_FILTER_CLASS (klass);
   audiofilter_class->setup = gst_lv2_filter_setup;
 
-  transform_class = GST_BASE_TRANSFORM_CLASS (klass);
   transform_class->stop = gst_lv2_filter_stop;
   transform_class->transform = gst_lv2_filter_transform;
   transform_class->transform_ip = gst_lv2_filter_transform_ip;
 
-  klass->plugin = lv2plugin;
-
-  /* properties have an offset of 1 */
-  ix = 1;
+  klass->lv2.plugin = lv2plugin;
 
-  /* register properties */
-
-  for (i = 0; i < klass->control_in_ports->len; i++, ix++) {
-    p = gst_lv2_filter_class_get_param_spec (klass,
-        g_array_index (klass->control_in_ports, GstLV2FilterPort, i).index);
-
-    g_object_class_install_property (gobject_class, ix, p);
-  }
-
-  for (i = 0; i < klass->control_out_ports->len; i++, ix++) {
-    p = gst_lv2_filter_class_get_param_spec (klass,
-        g_array_index (klass->control_out_ports, GstLV2FilterPort, i).index);
-
-    g_object_class_install_property (gobject_class, ix, p);
-  }
+  gst_lv2_class_install_properties (&klass->lv2, gobject_class, 1);
 }
 
 static void
 gst_lv2_filter_init (GstLV2Filter * self, GstLV2FilterClass * klass)
 {
-  self->plugin = klass->plugin;
-  self->instance = NULL;
-  self->activated = FALSE;
+  gst_lv2_init (&self->lv2, &klass->lv2);
 
-  self->ports.control.in = g_new0 (gfloat, klass->control_in_ports->len);
-  self->ports.control.out = g_new0 (gfloat, klass->control_out_ports->len);
-
-  if (!lilv_plugin_has_feature (self->plugin, in_place_broken_pred))
+  if (!lilv_plugin_has_feature (klass->lv2.plugin, in_place_broken_pred))
     gst_base_transform_set_in_place (GST_BASE_TRANSFORM (self), TRUE);
 }
 
@@ -801,7 +450,7 @@ gst_lv2_filter_register_element (GstPlugin * plugin, const gchar * type_name,
   GTypeInfo typeinfo = {
     sizeof (GstLV2FilterClass),
     (GBaseInitFunc) gst_lv2_filter_base_init,
-    NULL,
+    (GBaseFinalizeFunc) gst_lv2_filter_base_finalize,
     (GClassInitFunc) gst_lv2_filter_class_init,
     NULL,
     lv2plugin,
@@ -819,7 +468,7 @@ gst_lv2_filter_register_element (GstPlugin * plugin, const gchar * type_name,
 
 
   /* FIXME: not needed anymore when we can add pad templates, etc in class_init
-   * as class_data contains the LADSPA_Descriptor too */
+   * as class_data contains the Descriptor too */
   g_type_set_qdata (type, descriptor_quark, lv2plugin);
 
   return gst_element_register (plugin, type_name, GST_RANK_NONE, type);
diff --git a/ext/lv2/gstlv2utils.c b/ext/lv2/gstlv2utils.c
new file mode 100644
index 000000000..fca3a1c59
--- /dev/null
+++ b/ext/lv2/gstlv2utils.c
@@ -0,0 +1,427 @@
+/* GStreamer
+ * Copyright (C) 2016 Thibault Saunier <thibault.saunier@collabora.com>
+ *               2016 Stefan Sauer <ensonic@users.sf.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstlv2.h"
+#include "gstlv2utils.h"
+
+GST_DEBUG_CATEGORY_EXTERN (lv2_debug);
+#define GST_CAT_DEFAULT lv2_debug
+
+void
+gst_lv2_init (GstLV2 * lv2, GstLV2Class * lv2_class)
+{
+  lv2->klass = lv2_class;
+
+  lv2->instance = NULL;
+  lv2->activated = FALSE;
+
+  lv2->ports.control.in = g_new0 (gfloat, lv2_class->control_in_ports->len);
+  lv2->ports.control.out = g_new0 (gfloat, lv2_class->control_out_ports->len);
+}
+
+void
+gst_lv2_finalize (GstLV2 * lv2)
+{
+  g_free (lv2->ports.control.in);
+  g_free (lv2->ports.control.out);
+}
+
+gboolean
+gst_lv2_setup (GstLV2 * lv2, unsigned long rate)
+{
+  GstLV2Class *lv2_class = lv2->klass;
+  gint i;
+
+  if (lv2->instance)
+    lilv_instance_free (lv2->instance);
+
+  if (!(lv2->instance =
+          lilv_plugin_instantiate (lv2_class->plugin, rate, NULL)))
+    return FALSE;
+
+  /* connect the control ports */
+  for (i = 0; i < lv2_class->control_in_ports->len; i++)
+    lilv_instance_connect_port (lv2->instance,
+        g_array_index (lv2_class->control_in_ports, GstLV2Port, i).index,
+        &(lv2->ports.control.in[i]));
+
+  for (i = 0; i < lv2_class->control_out_ports->len; i++)
+    lilv_instance_connect_port (lv2->instance,
+        g_array_index (lv2_class->control_out_ports, GstLV2Port, i).index,
+        &(lv2->ports.control.out[i]));
+
+  lilv_instance_activate (lv2->instance);
+  lv2->activated = TRUE;
+
+  return TRUE;
+}
+
+gboolean
+gst_lv2_cleanup (GstLV2 * lv2, GstObject * obj)
+{
+  if (lv2->activated == FALSE) {
+    GST_ERROR_OBJECT (obj, "Deactivating but LV2 plugin not activated");
+    return TRUE;
+  }
+
+  if (lv2->instance == NULL) {
+    GST_ERROR_OBJECT (obj, "Deactivating but no LV2 plugin set");
+    return TRUE;
+  }
+
+  GST_DEBUG_OBJECT (obj, "deactivating");
+
+  lilv_instance_deactivate (lv2->instance);
+
+  lv2->activated = FALSE;
+
+  lilv_instance_free (lv2->instance);
+  lv2->instance = NULL;
+
+  return TRUE;
+}
+
+void
+gst_lv2_object_set_property (GstLV2 * lv2, GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  /* remember, properties have an offset */
+  prop_id -= lv2->klass->properties;
+
+  /* only input ports */
+  g_return_if_fail (prop_id < lv2->klass->control_in_ports->len);
+
+  /* now see what type it is */
+  switch (pspec->value_type) {
+    case G_TYPE_BOOLEAN:
+      lv2->ports.control.in[prop_id] =
+          g_value_get_boolean (value) ? 0.0f : 1.0f;
+      break;
+    case G_TYPE_INT:
+      lv2->ports.control.in[prop_id] = g_value_get_int (value);
+      break;
+    case G_TYPE_FLOAT:
+      lv2->ports.control.in[prop_id] = g_value_get_float (value);
+      break;
+    default:
+      GST_WARNING_OBJECT (object, "unhandled type: %s",
+          g_type_name (pspec->value_type));
+      g_assert_not_reached ();
+  }
+}
+
+void
+gst_lv2_object_get_property (GstLV2 * lv2, GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  gfloat *controls;
+
+  /* remember, properties have an offset */
+  prop_id -= lv2->klass->properties;
+
+  if (prop_id < lv2->klass->control_in_ports->len) {
+    controls = lv2->ports.control.in;
+  } else if (prop_id < lv2->klass->control_in_ports->len +
+      lv2->klass->control_out_ports->len) {
+    controls = lv2->ports.control.out;
+    prop_id -= lv2->klass->control_in_ports->len;
+  } else {
+    g_return_if_reached ();
+  }
+
+  /* now see what type it is */
+  switch (pspec->value_type) {
+    case G_TYPE_BOOLEAN:
+      g_value_set_boolean (value, controls[prop_id] > 0.0f);
+      break;
+    case G_TYPE_INT:
+      g_value_set_int (value, CLAMP (controls[prop_id], G_MININT, G_MAXINT));
+      break;
+    case G_TYPE_FLOAT:
+      g_value_set_float (value, controls[prop_id]);
+      break;
+    default:
+      GST_WARNING_OBJECT (object, "unhandled type: %s",
+          g_type_name (pspec->value_type));
+      g_return_if_reached ();
+  }
+}
+
+
+static gchar *
+gst_lv2_class_get_param_name (GstLV2Class * klass, GObjectClass * object_class,
+    const LilvPort * port)
+{
+  LilvPlugin *lv2plugin = klass->plugin;
+  gchar *ret;
+
+  ret = g_strdup (lilv_node_as_string (lilv_port_get_symbol (lv2plugin, port)));
+
+  /* this is the same thing that param_spec_* will do */
+  g_strcanon (ret, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-", '-');
+  /* satisfy glib2 (argname[0] must be [A-Za-z]) */
+  if (!((ret[0] >= 'a' && ret[0] <= 'z') || (ret[0] >= 'A' && ret[0] <= 'Z'))) {
+    gchar *tempstr = ret;
+
+    ret = g_strconcat ("param-", ret, NULL);
+    g_free (tempstr);
+  }
+
+  /* check for duplicate property names */
+  if (g_object_class_find_property (object_class, ret)) {
+    gint n = 1;
+    gchar *nret = g_strdup_printf ("%s-%d", ret, n++);
+
+    while (g_object_class_find_property (object_class, nret)) {
+      g_free (nret);
+      nret = g_strdup_printf ("%s-%d", ret, n++);
+    }
+    g_free (ret);
+    ret = nret;
+  }
+
+  GST_DEBUG ("built property name '%s' from port name '%s'", ret,
+      lilv_node_as_string (lilv_port_get_symbol (lv2plugin, port)));
+
+  return ret;
+}
+
+static gchar *
+gst_lv2_class_get_param_nick (GstLV2Class * klass, const LilvPort * port)
+{
+  LilvPlugin *lv2plugin = klass->plugin;
+
+  return g_strdup (lilv_node_as_string (lilv_port_get_name (lv2plugin, port)));
+}
+
+static GParamSpec *
+gst_lv2_class_get_param_spec (GstLV2Class * klass, GObjectClass * object_class,
+    gint portnum)
+{
+  LilvPlugin *lv2plugin = klass->plugin;
+  const LilvPort *port = lilv_plugin_get_port_by_index (lv2plugin, portnum);
+  LilvNode *lv2def, *lv2min, *lv2max;
+  GParamSpec *ret;
+  gchar *name, *nick;
+  gint perms;
+  gfloat lower = 0.0f, upper = 1.0f, def = 0.0f;
+
+  nick = gst_lv2_class_get_param_nick (klass, port);
+  name = gst_lv2_class_get_param_name (klass, object_class, port);
+
+  GST_DEBUG ("%s trying port %s : %s",
+      lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), name, nick);
+
+  perms = G_PARAM_READABLE;
+  if (lilv_port_is_a (lv2plugin, port, input_class))
+    perms |= G_PARAM_WRITABLE | G_PARAM_CONSTRUCT;
+  if (lilv_port_is_a (lv2plugin, port, control_class))
+    perms |= GST_PARAM_CONTROLLABLE;
+
+  if (lilv_port_has_property (lv2plugin, port, toggled_prop)) {
+    ret = g_param_spec_boolean (name, nick, nick, FALSE, perms);
+    goto done;
+  }
+
+  lilv_port_get_range (lv2plugin, port, &lv2def, &lv2min, &lv2max);
+
+  if (lv2def)
+    def = lilv_node_as_float (lv2def);
+  if (lv2min)
+    lower = lilv_node_as_float (lv2min);
+  if (lv2max)
+    upper = lilv_node_as_float (lv2max);
+
+  lilv_node_free (lv2def);
+  lilv_node_free (lv2min);
+  lilv_node_free (lv2max);
+
+  if (def < lower) {
+    GST_WARNING ("%s has lower bound %f > default %f",
+        lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), lower, def);
+    lower = def;
+  }
+
+  if (def > upper) {
+    GST_WARNING ("%s has upper bound %f < default %f",
+        lilv_node_as_string (lilv_plugin_get_uri (lv2plugin)), upper, def);
+    upper = def;
+  }
+
+  if (lilv_port_has_property (lv2plugin, port, integer_prop))
+    ret = g_param_spec_int (name, nick, nick, lower, upper, def, perms);
+  else
+    ret = g_param_spec_float (name, nick, nick, lower, upper, def, perms);
+
+done:
+  g_free (name);
+  g_free (nick);
+
+  return ret;
+}
+
+void
+gst_lv2_class_install_properties (GstLV2Class * lv2_class,
+    GObjectClass * object_class, guint offset)
+{
+  GParamSpec *p;
+  guint i;
+
+  lv2_class->properties = offset;
+
+  for (i = 0; i < lv2_class->control_in_ports->len; i++, offset++) {
+    p = gst_lv2_class_get_param_spec (lv2_class, object_class,
+        g_array_index (lv2_class->control_in_ports, GstLV2Port, i).index);
+
+    g_object_class_install_property (object_class, offset, p);
+  }
+
+  for (i = 0; i < lv2_class->control_out_ports->len; i++, offset++) {
+    p = gst_lv2_class_get_param_spec (lv2_class, object_class,
+        g_array_index (lv2_class->control_out_ports, GstLV2Port, i).index);
+
+    g_object_class_install_property (object_class, offset, p);
+  }
+}
+
+void
+gst_lv2_element_class_set_metadata (GstLV2Class * lv2_class,
+    GstElementClass * elem_class, const gchar * lv2_class_tags)
+{
+  LilvPlugin *lv2plugin = lv2_class->plugin;
+  LilvNode *val;
+  gchar *longname, *author;
+
+  val = lilv_plugin_get_name (lv2plugin);
+  if (val) {
+    longname = g_strdup (lilv_node_as_string (val));
+    lilv_node_free (val);
+  } else {
+    longname = g_strdup ("no description available");
+  }
+  val = lilv_plugin_get_author_name (lv2plugin);
+  if (val) {
+    author = g_strdup (lilv_node_as_string (val));
+    lilv_node_free (val);
+  } else {
+    author = g_strdup ("no author available");
+  }
+
+  gst_element_class_set_metadata (elem_class, longname, lv2_class_tags,
+      longname, author);
+  g_free (longname);
+  g_free (author);
+}
+
+
+void
+gst_lv2_class_init (GstLV2Class * lv2_class, GType type)
+{
+  LilvPlugin *lv2plugin;
+  /* FIXME Handle channels positionning
+   * GstAudioChannelPosition position = GST_AUDIO_CHANNEL_POSITION_INVALID; */
+  guint j, in_pad_index = 0, out_pad_index = 0;
+
+  GST_DEBUG ("LV2 initializing class");
+
+  lv2plugin = (LilvPlugin *) g_type_get_qdata (type, descriptor_quark);
+  g_assert (lv2plugin);
+  lv2_class->plugin = lv2plugin;
+
+  lv2_class->in_group.ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
+  lv2_class->out_group.ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
+  lv2_class->control_in_ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
+  lv2_class->control_out_ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
+
+  /* find ports and groups */
+  for (j = 0; j < lilv_plugin_get_num_ports (lv2plugin); j++) {
+    const LilvPort *port = lilv_plugin_get_port_by_index (lv2plugin, j);
+    const gboolean is_input = lilv_port_is_a (lv2plugin, port, input_class);
+    struct _GstLV2Port desc = { j, 0, };
+    LilvNodes *lv2group = lilv_port_get (lv2plugin, port, group_pred);
+
+    if (lv2group) {
+      /* port is part of a group */
+      const gchar *group_uri = lilv_node_as_uri (lv2group);
+      GstLV2Group *group = is_input
+          ? &lv2_class->in_group : &lv2_class->out_group;
+
+      if (group->uri == NULL) {
+        group->uri = g_strdup (group_uri);
+        group->pad = is_input ? in_pad_index++ : out_pad_index++;
+        group->ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
+      }
+
+      /* FIXME Handle channels positionning
+         position = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
+         sub_values = lilv_port_get_value (lv2plugin, port, has_role_pred);
+         if (lilv_nodes_size (sub_values) > 0) {
+         LilvNode *role = lilv_nodes_get_at (sub_values, 0);
+         position = gst_lv2_filter_role_to_position (role);
+         }
+         lilv_nodes_free (sub_values);
+
+         if (position != GST_AUDIO_CHANNEL_POSITION_INVALID) {
+         desc.position = position;
+         } */
+
+      g_array_append_val (group->ports, desc);
+    } else {
+      /* port is not part of a group, or it is part of a group but that group
+       * is illegal so we just ignore it */
+      if (lilv_port_is_a (lv2plugin, port, audio_class)) {
+        desc.pad = is_input ? in_pad_index++ : out_pad_index++;
+        if (is_input)
+          g_array_append_val (lv2_class->in_group.ports, desc);
+        else
+          g_array_append_val (lv2_class->out_group.ports, desc);
+      } else if (lilv_port_is_a (lv2plugin, port, control_class)) {
+        if (is_input)
+          g_array_append_val (lv2_class->control_in_ports, desc);
+        else
+          g_array_append_val (lv2_class->control_out_ports, desc);
+      } else {
+        /* unknown port type */
+        GST_INFO ("unhandled port %d: %s", j,
+            lilv_node_as_string (lilv_port_get_symbol (lv2plugin, port)));
+        continue;
+      }
+    }
+  }
+}
+
+void
+gst_lv2_class_finalize (GstLV2Class * lv2_class)
+{
+  GST_DEBUG ("LV2 finalizing class");
+
+  g_array_free (lv2_class->in_group.ports, TRUE);
+  lv2_class->in_group.ports = NULL;
+  g_array_free (lv2_class->out_group.ports, TRUE);
+  lv2_class->out_group.ports = NULL;
+  g_array_free (lv2_class->control_in_ports, TRUE);
+  lv2_class->control_in_ports = NULL;
+  g_array_free (lv2_class->control_out_ports, TRUE);
+  lv2_class->control_out_ports = NULL;
+}
diff --git a/ext/lv2/gstlv2utils.h b/ext/lv2/gstlv2utils.h
new file mode 100644
index 000000000..c23e115bc
--- /dev/null
+++ b/ext/lv2/gstlv2utils.h
@@ -0,0 +1,111 @@
+/* GStreamer
+ * Copyright (C) 2016 Thibault Saunier <thibault.saunier@collabora.com>
+ *               2016 Stefan Sauer <ensonic@users.sf.net>
+ *
+ * gstlv2utils.h: Header for LV2 plugin utils
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_LV2_UTILS_H__
+#define __GST_LV2_UTILS_H__
+
+#include <gst/gst.h>
+#include <gst/audio/audio.h>
+#include <gst/audio/audio-channels.h>
+
+#include <lilv/lilv.h>
+
+G_BEGIN_DECLS
+
+typedef struct _GstLV2Group GstLV2Group;
+typedef struct _GstLV2Port GstLV2Port;
+
+typedef struct _GstLV2 GstLV2;
+typedef struct _GstLV2Class GstLV2Class;
+
+struct _GstLV2Group
+{
+  gchar *uri; /**< RDF resource (URI or blank node) */
+  guint pad; /**< Gst pad index */
+  gchar *symbol; /**< Gst pad name / LV2 group symbol */
+  GArray *ports; /**< Array of GstLV2Port */
+  gboolean has_roles; /**< TRUE iff all ports have a known role */
+};
+
+struct _GstLV2Port
+{
+  gint index; /**< LV2 port index (on LV2 plugin) */
+  gint pad; /**< Gst pad index (iff not part of a group) */
+  LilvNode *role; /**< Channel position / port role */
+  GstAudioChannelPosition position; /**< Channel position */
+};
+
+struct _GstLV2
+{
+  GstLV2Class *klass;
+
+  LilvInstance *instance;
+
+  gboolean activated;
+  unsigned long rate;
+
+  struct
+  {
+    struct
+    {
+      gfloat *in;
+      gfloat *out;
+    } control;
+  } ports;
+};
+
+struct _GstLV2Class
+{
+  guint properties;
+
+  LilvPlugin *plugin;
+
+  GstLV2Group in_group; /**< Array of GstLV2Group */
+  GstLV2Group out_group; /**< Array of GstLV2Group */
+  GArray *control_in_ports; /**< Array of GstLV2Port */
+  GArray *control_out_ports; /**< Array of GstLV2Port */
+};
+
+
+void gst_lv2_init (GstLV2 * lv2, GstLV2Class * lv2_class);
+void gst_lv2_finalize (GstLV2 * lv2);
+
+gboolean gst_lv2_setup (GstLV2 * lv2, unsigned long rate);
+gboolean gst_lv2_cleanup (GstLV2 * lv2, GstObject *obj);
+
+
+void gst_lv2_object_set_property (GstLV2 * lv2, GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec);
+void gst_lv2_object_get_property (GstLV2 * lv2, GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec);
+
+void gst_lv2_class_install_properties (GstLV2Class * lv2_class,
+    GObjectClass * object_class, guint offset);
+void gst_lv2_element_class_set_metadata (GstLV2Class * lv2_class,
+    GstElementClass * elem_class, const gchar * lv2_class_tags);
+
+void gst_lv2_class_init (GstLV2Class * lv2_class, GType type);
+void gst_lv2_class_finalize (GstLV2Class * lv2_class);
+
+G_END_DECLS
+
+#endif /* __GST_LV2_UTILS_H__ */