faceoverlay: Revert deletion

https://bugzilla.gnome.org/show_bug.cgi?id=764011

configure.ac

@@ -459,6 +459,11 @@ dnl used in examples
 AG_GST_DEFAULT_ELEMENTS
 
 dnl *** plug-ins to include ***
+dnl Non ported plugins (non-dependant, then dependant)
+dnl Make sure you have a space before and after all plugins
+GST_PLUGINS_NONPORTED="faceoverlay"
+
+AC_SUBST(GST_PLUGINS_NONPORTED)
 
 dnl these are all the gst plug-ins, compilable without additional libs
 AG_GST_CHECK_PLUGIN(accurip)
@@ -480,6 +485,7 @@ AG_GST_CHECK_PLUGIN(coloreffects)
 AG_GST_CHECK_PLUGIN(debugutils)
 AG_GST_CHECK_PLUGIN(dvbsuboverlay)
 AG_GST_CHECK_PLUGIN(dvdspu)
+AG_GST_CHECK_PLUGIN(faceoverlay)
 AG_GST_CHECK_PLUGIN(festival)
 AG_GST_CHECK_PLUGIN(fieldanalysis)
 AG_GST_CHECK_PLUGIN(freeverb)
@@ -3524,6 +3530,7 @@ gst/coloreffects/Makefile
 gst/debugutils/Makefile
 gst/dvbsuboverlay/Makefile
 gst/dvdspu/Makefile
+gst/faceoverlay/Makefile
 gst/festival/Makefile
 gst/fieldanalysis/Makefile
 gst/freeverb/Makefile

gst/faceoverlay/Makefile.am

@@ -0,0 +1,13 @@
+plugin_LTLIBRARIES = libgstfaceoverlay.la
+
+# sources used to compile this plug-in
+libgstfaceoverlay_la_SOURCES = gstfaceoverlay.c
+
+# compiler and linker flags used to compile this plugin, set in configure.ac
+libgstfaceoverlay_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS)
+libgstfaceoverlay_la_LIBADD = $(GST_PLUGINS_BASE_LIBS) -lgstvideo-@GST_API_VERSION@ $(GST_LIBS)
+libgstfaceoverlay_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+libgstfaceoverlay_la_LIBTOOLFLAGS = $(GST_PLUGIN_LIBTOOLFLAGS)
+
+# headers we need but don't want installed
+noinst_HEADERS = gstfaceoverlay.h

gst/faceoverlay/gstfaceoverlay.c

@@ -0,0 +1,452 @@
+/* GStreamer faceoverlay plugin
+ * Copyright (C) 2011 Laura Lucas Alday <lauralucas@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
+ * which case the following provisions apply instead of the ones
+ * mentioned above:
+ *
+ * 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.
+ */
+
+/**
+ * SECTION:element-faceoverlay
+ *
+ * Overlays a SVG image over a detected face in a video stream.
+ * x, y, w, and h properties are optional, and change the image position and
+ * size relative to the detected face position and size.
+ *
+ * <refsect2>
+ * <title>Example launch line</title>
+ * |[
+ * gst-launch autovideosrc ! videoconvert ! faceoverlay location=/path/to/gnome-video-effects/pixmaps/bow.svg x=-5 y=-15 w=0.3 h=0.1 ! videoconvert ! autovideosink
+ * ]|
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <gst/gst.h>
+#include <gst/video/video.h>
+#include <string.h>
+
+#include "gstfaceoverlay.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_face_overlay_debug);
+#define GST_CAT_DEFAULT gst_face_overlay_debug
+
+enum
+{
+  PROP_0,
+  PROP_LOCATION,
+  PROP_X,
+  PROP_Y,
+  PROP_W,
+  PROP_H
+};
+
+static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-raw-rgb; video/x-raw-yuv")
+    );
+
+static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("video/x-raw-rgb; video/x-raw-yuv")
+    );
+
+GST_BOILERPLATE (GstFaceOverlay, gst_face_overlay, GstBin, GST_TYPE_BIN);
+
+static void gst_face_overlay_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_face_overlay_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+static void gst_face_overlay_message_handler (GstBin * bin,
+    GstMessage * message);
+static GstStateChangeReturn gst_face_overlay_change_state (GstElement * element,
+    GstStateChange transition);
+static gboolean gst_face_overlay_create_children (GstFaceOverlay * filter);
+
+static gboolean
+gst_face_overlay_create_children (GstFaceOverlay * filter)
+{
+  GstElement *csp, *face_detect, *overlay;
+  GstPad *pad;
+
+  csp = gst_element_factory_make ("videoconvert", NULL);
+  face_detect = gst_element_factory_make ("facedetect", NULL);
+  overlay = gst_element_factory_make ("rsvgoverlay", NULL);
+
+  /* FIXME: post missing-plugin messages on NULL->READY if needed */
+  if (csp == NULL || face_detect == NULL || overlay == NULL)
+    goto missing_element;
+
+  g_object_set (face_detect, "display", FALSE, NULL);
+
+  gst_bin_add_many (GST_BIN (filter), face_detect, csp, overlay, NULL);
+  filter->svg_overlay = overlay;
+
+  if (!gst_element_link_many (face_detect, csp, overlay, NULL))
+    GST_ERROR_OBJECT (filter, "couldn't link elements");
+
+  pad = gst_element_get_static_pad (face_detect, "sink");
+  if (!gst_ghost_pad_set_target (GST_GHOST_PAD (filter->sinkpad), pad))
+    GST_ERROR_OBJECT (filter->sinkpad, "couldn't set sinkpad target");
+  gst_object_unref (pad);
+
+  pad = gst_element_get_static_pad (overlay, "src");
+  if (!gst_ghost_pad_set_target (GST_GHOST_PAD (filter->srcpad), pad))
+    GST_ERROR_OBJECT (filter->srcpad, "couldn't set srcpad target");
+  gst_object_unref (pad);
+
+  return TRUE;
+
+/* ERRORS */
+missing_element:
+  {
+    /* clean up */
+    if (csp == NULL)
+      GST_ERROR_OBJECT (filter, "videoconvert element not found");
+    else
+      gst_object_unref (csp);
+
+    if (face_detect == NULL)
+      GST_ERROR_OBJECT (filter, "facedetect element not found (opencv plugin)");
+    else
+      gst_object_unref (face_detect);
+
+    if (overlay == NULL)
+      GST_ERROR_OBJECT (filter, "rsvgoverlay element not found (rsvg plugin)");
+    else
+      gst_object_unref (overlay);
+
+    return FALSE;
+  }
+}
+
+static GstStateChangeReturn
+gst_face_overlay_change_state (GstElement * element, GstStateChange transition)
+{
+  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+  GstFaceOverlay *filter = GST_FACEOVERLAY (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      if (filter->svg_overlay == NULL) {
+        GST_ELEMENT_ERROR (filter, CORE, MISSING_PLUGIN, (NULL),
+            ("Some required plugins are missing, probably either the opencv "
+                "facedetect element or rsvgoverlay"));
+        return GST_STATE_CHANGE_FAILURE;
+      }
+      filter->update_svg = TRUE;
+      break;
+    default:
+      break;
+  }
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+  switch (transition) {
+    default:
+      break;
+  }
+
+  return ret;
+}
+
+static void
+gst_face_overlay_handle_faces (GstFaceOverlay * filter, const GstStructure * s)
+{
+  guint x, y, width, height;
+  gint svg_x, svg_y, svg_width, svg_height;
+  const GstStructure *face;
+  const GValue *faces_list, *face_val;
+  gchar *new_location = NULL;
+  gint face_count;
+
+#if 0
+  /* optionally draw the image once every two messages for better performance */
+  filter->process_message = !filter->process_message;
+  if (!filter->process_message)
+    return;
+#endif
+
+  faces_list = gst_structure_get_value (s, "faces");
+  face_count = gst_value_list_get_size (faces_list);
+  GST_LOG_OBJECT (filter, "face count: %d", face_count);
+
+  if (face_count == 0) {
+    GST_DEBUG_OBJECT (filter, "no face, clearing overlay");
+    g_object_set (filter->svg_overlay, "location", NULL, NULL);
+    GST_OBJECT_LOCK (filter);
+    filter->update_svg = TRUE;
+    GST_OBJECT_UNLOCK (filter);
+    return;
+  }
+
+  /* The last face in the list seems to be the right one, objects mistakenly
+   * detected as faces for a couple of frames seem to be in the list
+   * beginning. TODO: needs confirmation. */
+  face_val = gst_value_list_get_value (faces_list, face_count - 1);
+  face = gst_value_get_structure (face_val);
+  gst_structure_get_uint (face, "x", &x);
+  gst_structure_get_uint (face, "y", &y);
+  gst_structure_get_uint (face, "width", &width);
+  gst_structure_get_uint (face, "height", &height);
+
+  /* Apply x and y offsets relative to face position and size.
+   * Set image width and height as a fraction of face width and height.
+   * Cast to int since face position and size will never be bigger than
+   * G_MAX_INT and we may have negative values as svg_x or svg_y */
+
+  GST_OBJECT_LOCK (filter);
+
+  svg_x = (gint) x + (gint) (filter->x * width);
+  svg_y = (gint) y + (gint) (filter->y * height);
+
+  svg_width = (gint) (filter->w * width);
+  svg_height = (gint) (filter->h * height);
+
+  if (filter->update_svg) {
+    new_location = g_strdup (filter->location);
+    filter->update_svg = FALSE;
+  }
+  GST_OBJECT_UNLOCK (filter);
+
+  if (new_location != NULL) {
+    GST_DEBUG_OBJECT (filter, "set rsvgoverlay location=%s", new_location);
+    g_object_set (filter->svg_overlay, "location", new_location, NULL);
+    g_free (new_location);
+  }
+
+  GST_LOG_OBJECT (filter, "overlay dimensions: %d x %d @ %d,%d",
+      svg_width, svg_height, svg_x, svg_y);
+
+  g_object_set (filter->svg_overlay,
+      "x", svg_x, "y", svg_y, "width", svg_width, "height", svg_height, NULL);
+}
+
+static void
+gst_face_overlay_message_handler (GstBin * bin, GstMessage * message)
+{
+  if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ELEMENT) {
+    const GstStructure *s = gst_message_get_structure (message);
+
+    if (gst_structure_has_name (s, "facedetect")) {
+      gst_face_overlay_handle_faces (GST_FACEOVERLAY (bin), s);
+    }
+  }
+
+  GST_BIN_CLASS (parent_class)->handle_message (bin, message);
+}
+
+static void
+gst_face_overlay_base_init (gpointer gclass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
+
+  gst_element_class_set_static_metadata (element_class,
+      "faceoverlay",
+      "Filter/Editor/Video",
+      "Overlays SVG graphics over a detected face in a video stream",
+      "Laura Lucas Alday <lauralucas@gmail.com>");
+
+  gst_element_class_add_static_pad_template (element_class, &src_factory);
+  gst_element_class_add_static_pad_template (element_class, &sink_factory);
+}
+
+static void
+gst_face_overlay_class_init (GstFaceOverlayClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstBinClass *gstbin_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = G_OBJECT_CLASS (klass);
+  gstbin_class = GST_BIN_CLASS (klass);
+  gstelement_class = GST_ELEMENT_CLASS (klass);
+
+  gobject_class->set_property = gst_face_overlay_set_property;
+  gobject_class->get_property = gst_face_overlay_get_property;
+
+  g_object_class_install_property (gobject_class, PROP_LOCATION,
+      g_param_spec_string ("location", "Location",
+          "Location of SVG file to use for face overlay",
+          "", G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_X,
+      g_param_spec_float ("x", "face x offset",
+          "Specify image x relative to detected face x.", -G_MAXFLOAT,
+          G_MAXFLOAT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_Y,
+      g_param_spec_float ("y", "face y offset",
+          "Specify image y relative to detected face y.", -G_MAXFLOAT,
+          G_MAXFLOAT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_W,
+      g_param_spec_float ("w", "face width percent",
+          "Specify image width relative to face width.", 0, G_MAXFLOAT, 1,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_H,
+      g_param_spec_float ("h", "face height percent",
+          "Specify image height relative to face height.", 0, G_MAXFLOAT, 1,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  gstbin_class->handle_message =
+      GST_DEBUG_FUNCPTR (gst_face_overlay_message_handler);
+  gstelement_class->change_state =
+      GST_DEBUG_FUNCPTR (gst_face_overlay_change_state);
+}
+
+static void
+gst_face_overlay_init (GstFaceOverlay * filter, GstFaceOverlayClass * gclass)
+{
+  GstPadTemplate *tmpl;
+
+  filter->x = 0;
+  filter->y = 0;
+  filter->w = 1;
+  filter->h = 1;
+  filter->svg_overlay = NULL;
+  filter->location = NULL;
+  filter->process_message = TRUE;
+
+  tmpl = gst_static_pad_template_get (&sink_factory);
+  filter->sinkpad = gst_ghost_pad_new_no_target_from_template ("sink", tmpl);
+  gst_object_unref (tmpl);
+  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
+
+  tmpl = gst_static_pad_template_get (&src_factory);
+  filter->srcpad = gst_ghost_pad_new_no_target_from_template ("src", tmpl);
+  gst_object_unref (tmpl);
+  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
+
+  gst_face_overlay_create_children (filter);
+}
+
+static void
+gst_face_overlay_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstFaceOverlay *filter = GST_FACEOVERLAY (object);
+
+  switch (prop_id) {
+    case PROP_LOCATION:
+      GST_OBJECT_LOCK (filter);
+      g_free (filter->location);
+      filter->location = g_value_dup_string (value);
+      filter->update_svg = TRUE;
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    case PROP_X:
+      GST_OBJECT_LOCK (filter);
+      filter->x = g_value_get_float (value);
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    case PROP_Y:
+      GST_OBJECT_LOCK (filter);
+      filter->y = g_value_get_float (value);
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    case PROP_W:
+      GST_OBJECT_LOCK (filter);
+      filter->w = g_value_get_float (value);
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    case PROP_H:
+      GST_OBJECT_LOCK (filter);
+      filter->h = g_value_get_float (value);
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_face_overlay_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstFaceOverlay *filter = GST_FACEOVERLAY (object);
+
+  switch (prop_id) {
+    case PROP_LOCATION:
+      GST_OBJECT_LOCK (filter);
+      g_value_set_string (value, filter->location);
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    case PROP_X:
+      GST_OBJECT_LOCK (filter);
+      g_value_set_float (value, filter->x);
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    case PROP_Y:
+      GST_OBJECT_LOCK (filter);
+      g_value_set_float (value, filter->y);
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    case PROP_W:
+      GST_OBJECT_LOCK (filter);
+      g_value_set_float (value, filter->w);
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    case PROP_H:
+      GST_OBJECT_LOCK (filter);
+      g_value_set_float (value, filter->h);
+      GST_OBJECT_UNLOCK (filter);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static gboolean
+faceoverlay_init (GstPlugin * faceoverlay)
+{
+  GST_DEBUG_CATEGORY_INIT (gst_face_overlay_debug, "faceoverlay",
+      0, "SVG Face Overlay");
+
+  return gst_element_register (faceoverlay, "faceoverlay", GST_RANK_NONE,
+      GST_TYPE_FACEOVERLAY);
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    faceoverlay,
+    "SVG Face Overlay",
+    faceoverlay_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)

gst/faceoverlay/gstfaceoverlay.h

@@ -0,0 +1,94 @@
+/* GStreamer faceoverlay plugin
+ * Copyright (C) 2011 Laura Lucas Alday <lauralucas@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
+ * which case the following provisions apply instead of the ones
+ * mentioned above:
+ *
+ * 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_FACEOVERLAY_H__
+#define __GST_FACEOVERLAY_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_FACEOVERLAY \
+  (gst_face_overlay_get_type())
+#define GST_FACEOVERLAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FACEOVERLAY,GstFaceOverlay))
+#define GST_FACEOVERLAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_FACEOVERLAY,GstFaceOverlayClass))
+#define GST_IS_FACEOVERLAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FACEOVERLAY))
+#define GST_IS_FACEOVERLAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FACEOVERLAY))
+
+typedef struct _GstFaceOverlay GstFaceOverlay;
+typedef struct _GstFaceOverlayClass GstFaceOverlayClass;
+
+struct _GstFaceOverlay
+{
+  GstBin parent;
+
+  GstPad *sinkpad, *srcpad;
+
+  GstElement *face_detect;
+  GstElement *colorspace;
+  GstElement *svg_overlay;
+
+  gboolean process_message;
+
+  gboolean update_svg;
+
+  gchar *location;
+  gfloat x;
+  gfloat y;
+  gfloat w;
+  gfloat h;
+};
+
+struct _GstFaceOverlayClass
+{
+  GstBinClass parent_class;
+};
+
+GType gst_face_overlay_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_FACEOVERLAY_H__ */

gst/faceoverlay/meson.build

@@ -0,0 +1,12 @@
+fover_sources = [
+  'gstfaceoverlay.c',
+]
+
+gstfaceoverlay = library('gstfaceoverlay',
+  fover_sources,
+  c_args : gst_plugins_bad_args,
+  include_directories : [configinc],
+  dependencies : [gstbase_dep, gstvideo_dep],
+  install : true,
+  install_dir : plugins_install_dir,
+)

gst/meson.build

@@ -16,6 +16,8 @@ subdir('compositor')
 subdir('debugutils')
 subdir('dvbsuboverlay')
 subdir('dvdspu')
+# did not work
+#subdir('faceoverlay')
 subdir('festival')
 subdir('fieldanalysis')
 subdir('freeverb')