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7faa44057e
The handdetect plugin is for detecting hand gestures using opencv. It was created in the course of the Google Summer of Code. https://bugzilla.gnome.org/show_bug.cgi?id=685655
174 lines
5.8 KiB
C
174 lines
5.8 KiB
C
/*
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*============================================================================
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*Name : gsthanddetect_app.c
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*Author : Andol Li, andol@andol.info
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*Version : 0.1
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*Copyright : @2012, gstreamer
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*Description : gsteramer handdetect plugin demo application in C, part work of GSoc 2012 project
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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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#include <glib.h>
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#include <glib-object.h>
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#define PROFILE_FIST "/usr/local/share/opencv/haarcascades/fist.xml"
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#define PROFILE_PALM "/usr/local/share/opencv/haarcascades/palm.xml"
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GstElement *playbin,
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*pipeline,
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*v4l2src, *videoscale, *ffmpegcolorspace_in, *handdetect, *ffmpegcolorspace_out, *xvimagesink;
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static GstBusSyncHandler
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bus_sync_handler(GstBus *bus, GstMessage *message, GstPipeline *pipeline)
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{
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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(message->structure, "hand-gesture") )
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return GST_BUS_PASS;
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/* parse msg structure */
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const GstStructure *structure = message->structure;
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/* if PALM gesture detected */
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if (structure &&
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strcmp (gst_structure_get_name (structure), "hand-gesture") == 0 &&
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strcmp (gst_structure_get_string (structure, "gesture"), "palm") == 0) {
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/* media operation - closed palm to stop media play*/
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gst_element_set_state (playbin, GST_STATE_PAUSED);
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}
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/* if FIST gesture detected */
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if (structure &&
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strcmp (gst_structure_get_name (structure), "hand-gesture") == 0 &&
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strcmp (gst_structure_get_string (structure, "gesture"), "fist") == 0){
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/* print message type and structure name */
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g_print("%s{{%s}}\n", gst_message_type_get_name(message->type), gst_structure_get_name(structure));
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/* print msg structure names&values */
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int i;
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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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const GValue *value = gst_structure_get_value(structure, name);
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type == G_TYPE_STRING ?
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g_print("-%s[%s]{%s}\n", name, g_type_name(type), g_value_get_string(value)) :
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g_print("-%s[%s]{%d}\n", name, g_type_name(type), g_value_get_uint(value));
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}
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g_print("\n");
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/* get X,Y positions in frame */
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const GValue *x_value = gst_structure_get_value(structure, "x");
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gint x = g_value_get_uint(x_value);
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const GValue *y_value = gst_structure_get_value(structure, "y");
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gint y = g_value_get_uint(y_value);
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/* set object volumes [0-10] based on Y */
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g_object_set(G_OBJECT(playbin), "volume", (gdouble)(10 - y/24 ), NULL);
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/* seek playback positions */
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gint64 position, length;
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GstFormat format = GST_FORMAT_TIME;
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gst_element_query_duration(playbin, &format, &length);
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/* Width = 320 is specified in caps */
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position = (gint64) length * x / 320;
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gst_element_set_state(playbin, GST_STATE_PAUSED);
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gst_element_seek(GST_ELEMENT(playbin),
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1.0,
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format,
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GST_SEEK_FLAG_FLUSH,
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GST_SEEK_TYPE_SET,
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position,
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GST_SEEK_TYPE_NONE,
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GST_CLOCK_TIME_NONE );
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gst_element_set_state(GST_ELEMENT(playbin), GST_STATE_PLAYING);
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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 main(gint argc, gchar **argv) {
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static GMainLoop *loop;
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loop = g_main_loop_new(NULL, FALSE);
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/* video source */
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gchar *video_device = "/dev/video0";
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gchar *video_file = "file:///home/javauser/workspace/gitfiles/gsthanddetect_app/video.avi";
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/* bus */
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GstBus *bus;
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/* caps */
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GstCaps *caps;
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/* init gst */
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gst_init(&argc, &argv);
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/* init elements */
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playbin = gst_element_factory_make("playbin2", "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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ffmpegcolorspace_in = gst_element_factory_make("ffmpegcolorspace", "app_ffmpegcolorspace_in");
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handdetect = gst_element_factory_make("handdetect", "app_handdetect");
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ffmpegcolorspace_out = gst_element_factory_make("ffmpegcolorspace", "app_ffmpegcolorspace_out");
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xvimagesink = gst_element_factory_make("xvimagesink", "app_xvimagesink");
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/* check init results */
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if(!playbin || !pipeline || !v4l2src || !videoscale || !ffmpegcolorspace_in
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|| !handdetect || !ffmpegcolorspace_out || !xvimagesink)
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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", video_file, NULL);
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g_object_set (G_OBJECT(v4l2src), "device", video_device, NULL);
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g_object_set (G_OBJECT (handdetect), "profile_fist", PROFILE_FIST, NULL);
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g_object_set (G_OBJECT (handdetect), "profile_palm", PROFILE_PALM, NULL);
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/* set caps */
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caps = gst_caps_from_string("video/x-raw-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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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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ffmpegcolorspace_in,
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handdetect,
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ffmpegcolorspace_out,
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xvimagesink,
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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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gst_caps_unref(caps);
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/* link elements */
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gst_element_link_many(
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videoscale,
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ffmpegcolorspace_in,
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handdetect,
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ffmpegcolorspace_out,
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xvimagesink,
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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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