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/* GStreamer
* Copyright (C) 2012 Andol Li <andol@andol.info>
*
* gsthanddetect_test: gstreamer handdetect plugin demo application,
* part work of GSoc 2012 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, *handdetect,
*videoconvert_out, *xvimagesink;
static GstBusSyncReply
bus_sync_handler (GstBus * bus, GstMessage * message, GstPipeline * pipeline)
{
const GstStructure *structure;
gint64 position, length;
GstFormat format = GST_FORMAT_TIME;
const GValue *x_value, *y_value;
gint x, i, y;
/* select msg */
if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT ||
!gst_structure_has_name (gst_message_get_structure (message),
"hand-gesture"))
return GST_BUS_PASS;
/* parse msg structure */
structure = gst_message_get_structure (message);
/* if PALM gesture detected */
if (structure &&
strcmp (gst_structure_get_name (structure), "hand-gesture") == 0 &&
strcmp (gst_structure_get_string (structure, "gesture"), "palm") == 0) {
/* media operation - closed palm to stop media play */
gst_element_set_state (playbin, GST_STATE_PAUSED);
}
/* if FIST gesture detected */
if (structure &&
strcmp (gst_structure_get_name (structure), "hand-gesture") == 0 &&
strcmp (gst_structure_get_string (structure, "gesture"), "fist") == 0) {
/* print message type and structure name */
g_print ("%s{{%s}}\n", gst_message_type_get_name (message->type),
gst_structure_get_name (structure));
/* print msg structure names&values */
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);
const GValue *value = gst_structure_get_value (structure, name);
type == G_TYPE_STRING ?
g_print ("-%s[%s]{%s}\n", name, g_type_name (type),
g_value_get_string (value)) : g_print ("-%s[%s]{%d}\n", name,
g_type_name (type), g_value_get_uint (value));
}
g_print ("\n");
/* get X,Y positions in frame */
x_value = gst_structure_get_value (structure, "x");
x = g_value_get_uint (x_value);
y_value = gst_structure_get_value (structure, "y");
y = g_value_get_uint (y_value);
/* set object volumes [0-10] based on Y */
g_object_set (G_OBJECT (playbin), "volume", (gdouble) (10 - y / 24), NULL);
/* seek playback positions */
gst_element_query_duration (playbin, format, &length);
/* Width = 320 is specified in caps */
position = (gint64) length *x / 320;
gst_element_set_state (playbin, GST_STATE_PAUSED);
gst_element_seek (GST_ELEMENT (playbin),
1.0,
format,
GST_SEEK_FLAG_FLUSH,
GST_SEEK_TYPE_SET, position, GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE);
gst_element_set_state (GST_ELEMENT (playbin), GST_STATE_PLAYING);
}
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");
handdetect = gst_element_factory_make ("handdetect", "app_handdetect");
videoconvert_out =
gst_element_factory_make ("videoconvert", "app_videoconvert_out");
xvimagesink = gst_element_factory_make ("xvimagesink", "app_xvimagesink");
/* check init results */
if (!playbin || !pipeline || !v4l2src || !videoscale || !videoconvert_in
|| !handdetect || !videoconvert_out || !xvimagesink)
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, handdetect, videoconvert_out, xvimagesink, 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, handdetect, videoconvert_out, xvimagesink, 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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