gstreamer/gst/faceoverlay/gstfaceoverlay.c

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/* 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-1.0 autovideosrc ! videoconvert ! faceoverlay location=/path/to/gnome-video-effects/pixmaps/bow.svg x=0.5 y=0.5 w=0.7 h=0.7 ! 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 (GST_VIDEO_CAPS_MAKE ("{RGB}")));
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{BGRA}")));
#define gst_face_overlay_parent_class parent_class
G_DEFINE_TYPE (GstFaceOverlay, gst_face_overlay, 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_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));
gst_element_class_set_static_metadata (gstelement_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_pad_template (gstelement_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_factory));
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)
{
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)