gstreamer/subprojects/gst-plugins-bad/tests/examples/opencv/gstmotioncells_dynamic_test.c

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/* GStreamer
* Copyright (C) 2011 Robert Jobbagy <jobbagy.robert@gmail.com>
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* Copyright (C) 2014 Tim-Philipp Müller <tim centricular com>
*
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* motioncells_dynamic_test: test to show effect of property changes at runtime
*
* 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 <gst/gst.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
static void
print_element_properties (GstElement * element)
{
GParamSpec **pspecs, *pspec;
guint num, i;
g_print ("\tProperty : value (type)\n");
pspecs = g_object_class_list_properties (G_OBJECT_GET_CLASS (element), &num);
for (i = 0; i < num; ++i) {
GValue val = G_VALUE_INIT;
const gchar *type_name;
gchar *s;
pspec = pspecs[i];
/* only care about properties we can read and write */
if ((pspec->flags & G_PARAM_READWRITE) != G_PARAM_READWRITE)
continue;
/* and which can be changed after construction */
if ((pspec->flags & G_PARAM_CONSTRUCT_ONLY))
continue;
/* ignore some GstObject properties which are not interesting */
if (!strcmp (pspec->name, "name") || !strcmp (pspec->name, "parent"))
continue;
/* ignore properties we can't change in a meaningful way */
if (G_IS_PARAM_SPEC_BOXED (pspec) || G_IS_PARAM_SPEC_OBJECT (pspec)
|| G_IS_PARAM_SPEC_POINTER (pspec))
continue;
g_value_init (&val, G_PARAM_SPEC_VALUE_TYPE (pspec));
g_object_get_property (G_OBJECT (element), pspec->name, &val);
s = gst_value_serialize (&val);
if (G_PARAM_SPEC_VALUE_TYPE (pspec) == G_TYPE_STRING) {
type_name = "string";
g_free (s);
g_object_get (G_OBJECT (element), pspec->name, &s, NULL);
if (s == NULL)
s = g_strdup ("(null)");
} else {
type_name = g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec));
}
g_print ("\t%s: %s (%s)\n", pspec->name, s, type_name);
g_free (s);
g_value_unset (&val);
}
g_free (pspecs);
}
int
main (int argc, char *argv[])
{
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GstElement *pipeline, *source, *videor, *capsf;
GstElement *colorsp0, *colorsp1, *mcells, *sink;
GstCaps *caps;
gst_init (&argc, &argv);
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pipeline = gst_pipeline_new ("motioncells-pipeline");
if (argc == 2 && strcmp (argv[1], "test") == 0) {
source = gst_element_factory_make ("videotestsrc", NULL);
gst_util_set_object_arg (G_OBJECT (source), "pattern", "ball");
} else if (argc == 1 || strncmp (argv[1], "v4l", 3) == 0) {
source = gst_element_factory_make ("v4l2src", NULL);
} else {
g_printerr ("Usage: %s [v4l2|test]\n", argv[0]);
exit (-1);
}
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videor = gst_element_factory_make ("videorate", NULL);
capsf = gst_element_factory_make ("capsfilter", NULL);
colorsp0 = gst_element_factory_make ("videoconvert", NULL);
mcells = gst_element_factory_make ("motioncells", NULL);
colorsp1 = gst_element_factory_make ("videoconvert", NULL);
sink = gst_element_factory_make ("autovideosink", "videosink");
if (!pipeline || !source || !videor || !capsf || !colorsp0
|| !mcells || !colorsp1 || !sink) {
g_printerr ("One element could not be created. Exiting.\n");
return -1;
}
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caps = gst_caps_from_string ("video/x-raw,framerate=10/1");
g_object_set (G_OBJECT (capsf), "caps", caps, NULL);
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gst_bin_add_many (GST_BIN (pipeline), source, videor, capsf, colorsp0, mcells,
colorsp1, sink, NULL);
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gst_element_link_many (source, videor, capsf, colorsp0, mcells, colorsp1,
sink, NULL);
g_print ("Going to playing..\n");
gst_element_set_state (pipeline, GST_STATE_PLAYING);
g_print ("You can use these properties: \n\n");
print_element_properties (mcells);
g_print ("\nSee 'gst-inspect-1.0 motioncells' for all the details.\n");
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g_print ("Change properties like this: propertyname=value\n");
g_print ("Quit with 'q'\n");
/* Read command line input */
while (TRUE) {
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gchar *prop_name, *prop_value;
gchar input_buf[1024];
memset (input_buf, 0, sizeof (input_buf));
if (fgets (input_buf, sizeof (input_buf), stdin) == NULL)
break;
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/* strip off trailing newline */
g_strdelimit (input_buf, "\n", '\0');
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if (strcmp (input_buf, "q") == 0 || strcmp (input_buf, "quit") == 0)
break;
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prop_value = strchr (input_buf, '=');
if (prop_value == NULL) {
g_printerr ("Please enter either 'property=value' or 'quit'.\n");
continue;
}
*prop_value++ = '\0';
prop_name = input_buf;
gst_util_set_object_arg (G_OBJECT (mcells), prop_name, prop_value);
}
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}