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/* GStreamer
* Copyright (C) 2015 Vanessa Chipirrás <vchipirras6@gmail.com>
*
* gstfacedetect_test: gsteramer facedetect plugin demo application,
* part work of Outreachy 2015 project
*
* 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.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gst/gst.h>
GstElement *playbin, *pipeline;
GstElement *v4l2src, *videoscale, *videoconvert_in, *facedetect,
*videoconvert_out, *autovideosink;
static GstBusSyncReply
bus_sync_handler (GstBus * bus, GstMessage * message, GstPipeline * pipeline)
{
const GstStructure *structure;
const GValue *value;
const GstStructure *faces_structure;
const GValue *faces_value;
gboolean have_mouth_x, have_mouth_y;
gboolean have_nose_x, have_nose_y;
gchar *contents;
gint i;
guint size = 0;
gdouble volume = 0.0;
/* select msg */
if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT ||
!gst_structure_has_name (gst_message_get_structure (message),
"facedetect"))
return GST_BUS_PASS;
/* parse msg structure */
structure = gst_message_get_structure (message);
/* if facedetect is into buffer */
if (structure &&
strcmp (gst_structure_get_name (structure), "facedetect") == 0) {
/* print message type and structure name */
g_print ("Type message, name message: %s{{%s}}\n",
gst_message_type_get_name (message->type),
gst_structure_get_name (structure));
/* print msg structure names&type */
for (i = 0; i < gst_structure_n_fields (structure); i++) {
const gchar *name = gst_structure_nth_field_name (structure, i);
GType type = gst_structure_get_field_type (structure, name);
g_print ("-Name field, type: %s[%s]\n", name, g_type_name (type));
}
g_print ("\n");
/* get structure of faces */
value = gst_structure_get_value (structure, "faces");
/* obtain the contents into the structure */
contents = g_strdup_value_contents (value);
g_print ("Detected objects: %s\n", *(&contents));
/* list size */
size = gst_value_list_get_size (value);
/* if face is detected, obtain the values X and Y of mouth and of nose. */
if (size != 0) {
GstState state;
faces_value = gst_value_list_get_value (value, 0);
faces_structure = gst_value_get_structure (faces_value);
have_mouth_y = gst_structure_has_field (faces_structure, "mouth->y");
have_mouth_x = gst_structure_has_field (faces_structure, "mouth->x");
have_nose_y = gst_structure_has_field (faces_structure, "nose->y");
have_nose_x = gst_structure_has_field (faces_structure, "nose->x");
/* if paused, set to playing */
gst_element_get_state (GST_ELEMENT (playbin), &state, NULL,
GST_CLOCK_TIME_NONE);
if (state != GST_STATE_PLAYING) {
gst_element_set_state (GST_ELEMENT (playbin), GST_STATE_PLAYING);
}
/* get the volume value */
g_object_get (G_OBJECT (playbin), "volume", &volume, NULL);
/* media operation - hide your mouth for down the volume of the video */
if (have_mouth_y == 0 && have_mouth_x == 0) {
volume = volume - 0.5;
if (volume <= 0.5)
volume = 0.0;
g_object_set (G_OBJECT (playbin), "volume", volume, NULL);
}
/* media operation - hide your nose for up the volume of the video */
if (have_nose_y == 0 && have_nose_x == 0) {
volume = volume + 0.5;
if (volume >= 9.5)
volume = 10.0;
g_object_set (G_OBJECT (playbin), "volume", volume, NULL);
}
/* if face is not detected */
} else {
/* media operation - hide your face to stop media play */
gst_element_set_state (playbin, GST_STATE_PAUSED);
}
}
gst_message_unref (message);
return GST_BUS_DROP;
}
int
main (gint argc, gchar ** argv)
{
static GMainLoop *loop;
GstCaps *caps;
GstBus *bus;
gchar *uri;
if (argc < 2) {
fprintf (stderr, "oops, please give a file to play\n");
return -1;
}
uri = g_filename_to_uri (argv[1], NULL, NULL);
if (!uri) {
fprintf (stderr, "failed to create the uri\n");
return -1;
}
/* init gst */
gst_init (&argc, &argv);
loop = g_main_loop_new (NULL, FALSE);
/* init elements */
playbin = gst_element_factory_make ("playbin", "app_playbin");
pipeline = gst_pipeline_new ("app_pipeline");
v4l2src = gst_element_factory_make ("v4l2src", "app_v4l2src");
videoscale = gst_element_factory_make ("videoscale", "app_videoscale");
videoconvert_in =
gst_element_factory_make ("videoconvert", "app_videoconvert_in");
facedetect = gst_element_factory_make ("facedetect", "app_facedetect");
videoconvert_out =
gst_element_factory_make ("videoconvert", "app_videoconvert_out");
autovideosink =
gst_element_factory_make ("autovideosink", "app_autovideosink");
/* check init results */
if (!playbin || !pipeline || !v4l2src || !videoscale || !videoconvert_in
|| !facedetect || !videoconvert_out || !autovideosink)
g_error ("ERROR: element init failed.\n");
/* set values */
g_object_set (G_OBJECT (playbin), "uri", uri, NULL);
/* set caps */
caps =
gst_caps_from_string
("video/x-raw, format=(string)RGB, width=320, height=240, framerate=(fraction)30/1");
/* set bus */
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_set_sync_handler (bus, (GstBusSyncHandler) bus_sync_handler, pipeline,
NULL);
gst_object_unref (bus);
/* add elements to pipeline */
gst_bin_add_many (GST_BIN (pipeline),
v4l2src,
videoscale,
videoconvert_in, facedetect, videoconvert_out, autovideosink, NULL);
/* negotiate caps */
if (!gst_element_link_filtered (v4l2src, videoscale, caps)) {
g_printerr ("ERROR:v4l2src -> videoscale caps\n");
return 0;
}
gst_caps_unref (caps);
/* link elements */
gst_element_link_many (videoscale,
videoconvert_in, facedetect, videoconvert_out, autovideosink, NULL);
/* change states */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* start main loop */
g_main_loop_run (loop);
/* clean all */
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (GST_OBJECT (pipeline));
gst_element_set_state (playbin, GST_STATE_NULL);
gst_object_unref (GST_OBJECT (playbin));
return 0;
}
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