/* 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; }