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240 lines
7.8 KiB
C
240 lines
7.8 KiB
C
/* GStreamer
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* Copyright (C) 2015 Vanessa Chipirrás <vchipirras6@gmail.com>
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*
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* gstfacedetect_test: gstreamer facedetect plugin demo application,
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* part work of Outreachy 2015 project
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <gst/gst.h>
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GstElement *playbin, *pipeline;
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GstElement *v4l2src, *videoscale, *videoconvert_in, *facedetect,
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*videoconvert_out, *autovideosink;
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static gboolean ctrlvol = FALSE;
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static gboolean silent = FALSE;
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static GstBusSyncReply
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bus_sync_handler (GstBus * bus, GstMessage * message, GstPipeline * pipeline)
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{
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const GstStructure *structure;
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const GValue *value;
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gchar *contents;
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gint i;
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guint size = 0;
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/* select msg */
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if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT ||
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!gst_structure_has_name (gst_message_get_structure (message),
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"facedetect"))
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return GST_BUS_PASS;
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/* parse msg structure */
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structure = gst_message_get_structure (message);
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/* if facedetect is into buffer */
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if (structure &&
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strcmp (gst_structure_get_name (structure), "facedetect") == 0) {
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if (!silent) {
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/* print message type and structure name */
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g_print ("Type message, name message: %s{{%s}}\n",
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gst_message_type_get_name (message->type),
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gst_structure_get_name (structure));
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/* print msg structure names and type */
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for (i = 0; i < gst_structure_n_fields (structure); i++) {
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const gchar *name = gst_structure_nth_field_name (structure, i);
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GType type = gst_structure_get_field_type (structure, name);
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g_print ("-Name field, type: %s[%s]\n", name, g_type_name (type));
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}
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}
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/* get structure of faces */
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value = gst_structure_get_value (structure, "faces");
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/* obtain the contents into the structure */
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contents = g_strdup_value_contents (value);
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if (!silent)
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g_print ("Detected objects: %s\n\n", *(&contents));
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/* list size */
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size = gst_value_list_get_size (value);
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/* if face is detected, obtain the values X and Y of mouth and of nose. */
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if (size != 0) {
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GstState state;
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/* if paused, set to playing */
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gst_element_get_state (GST_ELEMENT (playbin), &state, NULL,
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GST_CLOCK_TIME_NONE);
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if (state != GST_STATE_PLAYING) {
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gst_element_set_state (GST_ELEMENT (playbin), GST_STATE_PLAYING);
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}
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if (ctrlvol) {
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gdouble volume;
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const GValue *faces_value = gst_value_list_get_value (value, 0);
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const GstStructure *faces_structure =
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gst_value_get_structure (faces_value);
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gboolean have_mouth_y =
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gst_structure_has_field (faces_structure, "mouth->y");
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gboolean have_mouth_x =
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gst_structure_has_field (faces_structure, "mouth->x");
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gboolean have_nose_y =
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gst_structure_has_field (faces_structure, "nose->y");
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gboolean have_nose_x =
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gst_structure_has_field (faces_structure, "nose->x");
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/* get the volume value */
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g_object_get (G_OBJECT (playbin), "volume", &volume, NULL);
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/* media operation - hide your mouth for down the volume of the video */
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if (have_mouth_y == 0 && have_mouth_x == 0) {
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volume = volume - 0.5;
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if (volume <= 0.5)
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volume = 0.0;
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g_object_set (G_OBJECT (playbin), "volume", volume, NULL);
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}
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/* media operation - hide your nose for up the volume of the video */
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if (have_nose_y == 0 && have_nose_x == 0) {
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volume = volume + 0.5;
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if (volume >= 9.5)
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volume = 10.0;
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g_object_set (G_OBJECT (playbin), "volume", volume, NULL);
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}
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}
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/* if face is not detected */
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} else {
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/* media operation - hide your face to stop media play */
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gst_element_set_state (playbin, GST_STATE_PAUSED);
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}
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}
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gst_message_unref (message);
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return GST_BUS_DROP;
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}
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int
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main (gint argc, gchar ** argv)
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{
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static GMainLoop *loop;
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GstCaps *caps;
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GstBus *bus;
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gchar *uri;
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GOptionEntry options[] = {
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{"control-volume", 'c', 0, G_OPTION_ARG_NONE, &ctrlvol,
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"Control the volume by hiding the nose or mouth", NULL},
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{"silent", 's', 0, G_OPTION_ARG_NONE, &silent,
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"Don't output the messages and detected faces structure", NULL},
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{NULL}
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};
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GOptionContext *ctx;
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GError *err = NULL;
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ctx = g_option_context_new ("<video file>\n\nfacedetect test application.");
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g_option_context_add_main_entries (ctx, options, NULL);
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g_option_context_add_group (ctx, gst_init_get_option_group ());
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if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
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g_print ("Error initializing: %s\n", err->message);
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g_option_context_free (ctx);
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g_clear_error (&err);
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exit (1);
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}
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g_option_context_free (ctx);
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if (argc < 2) {
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fprintf (stderr, "oops, please give a file to play\n");
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return -1;
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}
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uri = g_filename_to_uri (argv[1], NULL, NULL);
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if (!uri) {
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fprintf (stderr, "failed to create the uri\n");
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return -1;
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}
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/* init gst */
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gst_init (&argc, &argv);
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loop = g_main_loop_new (NULL, FALSE);
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/* init elements */
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playbin = gst_element_factory_make ("playbin", "app_playbin");
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pipeline = gst_pipeline_new ("app_pipeline");
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v4l2src = gst_element_factory_make ("v4l2src", "app_v4l2src");
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videoscale = gst_element_factory_make ("videoscale", "app_videoscale");
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videoconvert_in =
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gst_element_factory_make ("videoconvert", "app_videoconvert_in");
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facedetect = gst_element_factory_make ("facedetect", "app_facedetect");
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videoconvert_out =
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gst_element_factory_make ("videoconvert", "app_videoconvert_out");
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autovideosink =
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gst_element_factory_make ("autovideosink", "app_autovideosink");
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/* check init results */
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if (!playbin || !pipeline || !v4l2src || !videoscale || !videoconvert_in
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|| !facedetect || !videoconvert_out || !autovideosink)
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g_error ("ERROR: element init failed.\n");
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/* set values */
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g_object_set (G_OBJECT (playbin), "uri", uri, NULL);
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/* set caps */
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caps =
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gst_caps_from_string
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("video/x-raw, format=(string)RGB, width=320, height=240, framerate=(fraction)30/1");
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/* set bus */
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bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
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gst_bus_set_sync_handler (bus, (GstBusSyncHandler) bus_sync_handler, pipeline,
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NULL);
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gst_object_unref (bus);
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/* add elements to pipeline */
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gst_bin_add_many (GST_BIN (pipeline),
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v4l2src,
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videoscale,
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videoconvert_in, facedetect, videoconvert_out, autovideosink, NULL);
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/* negotiate caps */
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if (!gst_element_link_filtered (v4l2src, videoscale, caps)) {
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g_printerr ("ERROR:v4l2src -> videoscale caps\n");
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return 0;
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}
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gst_caps_unref (caps);
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/* link elements */
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gst_element_link_many (videoscale,
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videoconvert_in, facedetect, videoconvert_out, autovideosink, NULL);
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/* change states */
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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/* start main loop */
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g_main_loop_run (loop);
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/* clean all */
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (GST_OBJECT (pipeline));
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gst_element_set_state (playbin, GST_STATE_NULL);
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gst_object_unref (GST_OBJECT (playbin));
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return 0;
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}
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