tests/examples/equalizer/demo.c - imx-gst-plugins-good - Git at Google

 /* GStreamer
  * Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
  *
  * 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.
  */

 /* TODO: We use gdk_cairo_create() and others, which are deprecated */
 #define GDK_DISABLE_DEPRECATION_WARNINGS

 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include <gst/gst.h>
 #include <gtk/gtk.h>

 #define NBANDS 10

 static GtkWidget *drawingarea = NULL;
 static guint spect_height = 128;
 static guint spect_bands = 256;
 static gfloat height_scale = 2.0;

 static void
 on_window_destroy (GObject * object, gpointer user_data)
 {
   drawingarea = NULL;
   gtk_main_quit ();
 }

 static gboolean
 on_configure_event (GtkWidget * widget, GdkEventConfigure * event,
     gpointer user_data)
 {
   GstElement *spectrum = GST_ELEMENT (user_data);

   /*GST_INFO ("%d x %d", event->width, event->height); */
   spect_height = event->height;
   height_scale = event->height / 64.0;
   spect_bands = event->width;

   g_object_set (G_OBJECT (spectrum), "bands", spect_bands, NULL);
   return FALSE;
 }

 /* control gains */
 static void
 on_gain_changed (GtkRange * range, gpointer user_data)
 {
   GstObject *band = GST_OBJECT (user_data);
   gdouble value = gtk_range_get_value (range);

   g_object_set (band, "gain", value, NULL);
 }

 /* control bandwidths */
 static void
 on_bandwidth_changed (GtkRange * range, gpointer user_data)
 {
   GstObject *band = GST_OBJECT (user_data);
   gdouble value = gtk_range_get_value (range);

   g_object_set (band, "bandwidth", value, NULL);
 }

 /* control frequency */
 static void
 on_freq_changed (GtkRange * range, gpointer user_data)
 {
   GstObject *band = GST_OBJECT (user_data);
   gdouble value = gtk_range_get_value (range);

   /* hbox */
   GtkWidget *parent = gtk_widget_get_parent (GTK_WIDGET (range));

   /* frame */
   GtkWidget *parent_parent = gtk_widget_get_parent (parent);
   gchar *label = g_strdup_printf ("%d Hz", (int) (value + 0.5));

   gtk_frame_set_label (GTK_FRAME (parent_parent), label);
   g_free (label);

   g_object_set (band, "freq", value, NULL);
 }

 /* draw frequency spectrum as a bunch of bars */
 static void
 draw_spectrum (gfloat * data)
 {
   gint i;
   GdkRectangle rect = { 0, 0, spect_bands, spect_height };
   cairo_t *cr;

   if (!drawingarea)
     return;

   gdk_window_begin_paint_rect (gtk_widget_get_window (drawingarea), &rect);
   cr = gdk_cairo_create (gtk_widget_get_window (drawingarea));

   cairo_set_source_rgb (cr, 0, 0, 0);
   cairo_rectangle (cr, 0, 0, spect_bands, spect_height);
   cairo_fill (cr);
   for (i = 0; i < spect_bands; i++) {
     cairo_set_source_rgb (cr, 1, 1, 1);
     cairo_rectangle (cr, i, -data[i], 1, spect_height + data[i]);
     cairo_fill (cr);
   }
   cairo_destroy (cr);

   gdk_window_end_paint (gtk_widget_get_window (drawingarea));
 }

 static void
 dynamic_link (GstPadTemplate * templ, GstPad * newpad, gpointer user_data)
 {
   GstPad *target = GST_PAD (user_data);

   gst_pad_link (newpad, target);
   gst_object_unref (target);
 }

 /* receive spectral data from element message */
 static gboolean
 message_handler (GstBus * bus, GstMessage * message, gpointer data)
 {
   if (message->type == GST_MESSAGE_ELEMENT) {
     const GstStructure *s = gst_message_get_structure (message);
     const gchar *name = gst_structure_get_name (s);

     if (strcmp (name, "spectrum") == 0) {
       gfloat *spect = g_new (gfloat, spect_bands);
       const GValue *list;
       const GValue *value;
       guint i;

       list = gst_structure_get_value (s, "magnitude");
       for (i = 0; i < spect_bands; ++i) {
         value = gst_value_list_get_value (list, i);
         spect[i] = height_scale * g_value_get_float (value);
       }
       draw_spectrum (spect);
       g_free (spect);
     }
   }
   return TRUE;
 }

 int
 main (int argc, char *argv[])
 {
   GstElement *bin;
   GstElement *decodebin, *decconvert;
   GstElement *capsfilter, *equalizer, *spectrum, *sinkconvert, *sink;
   GstCaps *caps;
   GstBus *bus;
   GtkWidget *appwindow, *vbox, *hbox, *scale;
   int i, num_bands = NBANDS;

   GOptionEntry options[] = {
     {"bands", 'b', 0, G_OPTION_ARG_INT, &num_bands,
         "Number of bands", NULL},
     {NULL}
   };
   GOptionContext *ctx;
   GError *err = NULL;

   ctx = g_option_context_new ("- demo of audio equalizer");
   g_option_context_add_main_entries (ctx, options, NULL);
   g_option_context_add_group (ctx, gst_init_get_option_group ());
   g_option_context_add_group (ctx, gtk_get_option_group (TRUE));

   if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
     g_print ("Error initializing: %s\n", err->message);
     g_option_context_free (ctx);
     g_clear_error (&err);
     exit (1);
   }
   g_option_context_free (ctx);

   if (argc < 2) {
     g_print ("Usage: %s <uri to play>\n", argv[0]);
     g_print ("    For optional arguments: --help\n");
     exit (-1);
   }

   gst_init (&argc, &argv);
   gtk_init (&argc, &argv);

   bin = gst_pipeline_new ("bin");

   /* Uri decoding */
   decodebin = gst_element_factory_make ("uridecodebin", "decoder");
   g_object_set (G_OBJECT (decodebin), "uri", argv[1], NULL);

   /* Force float32 samples */
   decconvert = gst_element_factory_make ("audioconvert", "decconvert");
   capsfilter = gst_element_factory_make ("capsfilter", "capsfilter");
   caps =
       gst_caps_new_simple ("audio/x-raw", "format", G_TYPE_STRING, "F32LE",
       NULL);
   g_object_set (capsfilter, "caps", caps, NULL);

   equalizer = gst_element_factory_make ("equalizer-nbands", "equalizer");
   g_object_set (G_OBJECT (equalizer), "num-bands", num_bands, NULL);

   spectrum = gst_element_factory_make ("spectrum", "spectrum");
   g_object_set (G_OBJECT (spectrum), "bands", spect_bands, "threshold", -80,
       "post-messages", TRUE, "interval", 500 * GST_MSECOND, NULL);

   sinkconvert = gst_element_factory_make ("audioconvert", "sinkconvert");

   sink = gst_element_factory_make ("autoaudiosink", "sink");

   gst_bin_add_many (GST_BIN (bin), decodebin, decconvert, capsfilter, equalizer,
       spectrum, sinkconvert, sink, NULL);
   if (!gst_element_link_many (decconvert, capsfilter, equalizer, spectrum,
           sinkconvert, sink, NULL)) {
     fprintf (stderr, "can't link elements\n");
     exit (1);
   }

   /* Handle dynamic pads */
   g_signal_connect (G_OBJECT (decodebin), "pad-added",
       G_CALLBACK (dynamic_link), gst_element_get_static_pad (decconvert,
           "sink"));

   bus = gst_element_get_bus (bin);
   gst_bus_add_watch (bus, message_handler, NULL);
   gst_object_unref (bus);

   appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   gtk_window_set_title (GTK_WINDOW (appwindow), "Equalizer Demo");
   g_signal_connect (G_OBJECT (appwindow), "destroy",
       G_CALLBACK (on_window_destroy), NULL);
   vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);

   drawingarea = gtk_drawing_area_new ();
   gtk_widget_set_size_request (drawingarea, spect_bands, spect_height);
   g_signal_connect (G_OBJECT (drawingarea), "configure-event",
       G_CALLBACK (on_configure_event), (gpointer) spectrum);
   gtk_box_pack_start (GTK_BOX (vbox), drawingarea, TRUE, TRUE, 0);

   hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 20);

   for (i = 0; i < num_bands; i++) {
     GObject *band;
     gdouble freq;
     gdouble bw;
     gdouble gain;
     gchar *label;
     GtkWidget *frame, *scales_hbox;

     band = gst_child_proxy_get_child_by_index (GST_CHILD_PROXY (equalizer), i);
     g_assert (band != NULL);
     g_object_get (band, "freq", &freq, NULL);
     g_object_get (band, "bandwidth", &bw, NULL);
     g_object_get (band, "gain", &gain, NULL);

     label = g_strdup_printf ("%d Hz", (int) (freq + 0.5));
     frame = gtk_frame_new (label);
     g_free (label);

     scales_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);

     /* Create gain scale */
     scale = gtk_scale_new_with_range (GTK_ORIENTATION_VERTICAL,
         -24.0, 12.0, 0.5);
     gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
     gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
     gtk_range_set_value (GTK_RANGE (scale), gain);
     gtk_widget_set_size_request (scale, 35, 150);
     g_signal_connect (G_OBJECT (scale), "value-changed",
         G_CALLBACK (on_gain_changed), (gpointer) band);
     gtk_box_pack_start (GTK_BOX (scales_hbox), scale, FALSE, FALSE, 0);

     /* Create bandwidth scale */
     scale = gtk_scale_new_with_range (GTK_ORIENTATION_VERTICAL,
         0.0, 20000.0, 5.0);
     gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
     gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
     gtk_range_set_value (GTK_RANGE (scale), bw);
     gtk_widget_set_size_request (scale, 45, 150);
     g_signal_connect (G_OBJECT (scale), "value-changed",
         G_CALLBACK (on_bandwidth_changed), (gpointer) band);
     gtk_box_pack_start (GTK_BOX (scales_hbox), scale, TRUE, TRUE, 0);

     /* Create frequency scale */
     scale = gtk_scale_new_with_range (GTK_ORIENTATION_VERTICAL,
         20.0, 20000.0, 5.0);
     gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
     gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
     gtk_range_set_value (GTK_RANGE (scale), freq);
     gtk_widget_set_size_request (scale, 45, 150);
     g_signal_connect (G_OBJECT (scale), "value-changed",
         G_CALLBACK (on_freq_changed), (gpointer) band);
     gtk_box_pack_start (GTK_BOX (scales_hbox), scale, TRUE, TRUE, 0);

     gtk_container_add (GTK_CONTAINER (frame), scales_hbox);

     gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, TRUE, 0);
   }

   gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);

   gtk_container_add (GTK_CONTAINER (appwindow), vbox);
   gtk_widget_show_all (appwindow);

   gst_element_set_state (bin, GST_STATE_PLAYING);
   gtk_main ();
   gst_element_set_state (bin, GST_STATE_NULL);

   gst_object_unref (bin);

   return 0;
 }
	/* GStreamer
	* Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
	*
	* 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.
	*/

	/* TODO: We use gdk_cairo_create() and others, which are deprecated */
	#define GDK_DISABLE_DEPRECATION_WARNINGS

	#include <stdlib.h>
	#include <string.h>
	#include <math.h>
	#include <gst/gst.h>
	#include <gtk/gtk.h>

	#define NBANDS 10

	static GtkWidget *drawingarea = NULL;
	static guint spect_height = 128;
	static guint spect_bands = 256;
	static gfloat height_scale = 2.0;

	static void
	on_window_destroy (GObject * object, gpointer user_data)
	{
	drawingarea = NULL;
	gtk_main_quit ();
	}

	static gboolean
	on_configure_event (GtkWidget * widget, GdkEventConfigure * event,
	gpointer user_data)
	{
	GstElement *spectrum = GST_ELEMENT (user_data);

	/GST_INFO ("%d x %d", event->width, event->height); /
	spect_height = event->height;
	height_scale = event->height / 64.0;
	spect_bands = event->width;

	g_object_set (G_OBJECT (spectrum), "bands", spect_bands, NULL);
	return FALSE;
	}

	/* control gains */
	static void
	on_gain_changed (GtkRange * range, gpointer user_data)
	{
	GstObject *band = GST_OBJECT (user_data);
	gdouble value = gtk_range_get_value (range);

	g_object_set (band, "gain", value, NULL);
	}

	/* control bandwidths */
	static void
	on_bandwidth_changed (GtkRange * range, gpointer user_data)
	{
	GstObject *band = GST_OBJECT (user_data);
	gdouble value = gtk_range_get_value (range);

	g_object_set (band, "bandwidth", value, NULL);
	}

	/* control frequency */
	static void
	on_freq_changed (GtkRange * range, gpointer user_data)
	{
	GstObject *band = GST_OBJECT (user_data);
	gdouble value = gtk_range_get_value (range);

	/* hbox */
	GtkWidget *parent = gtk_widget_get_parent (GTK_WIDGET (range));

	/* frame */
	GtkWidget *parent_parent = gtk_widget_get_parent (parent);
	gchar *label = g_strdup_printf ("%d Hz", (int) (value + 0.5));

	gtk_frame_set_label (GTK_FRAME (parent_parent), label);
	g_free (label);

	g_object_set (band, "freq", value, NULL);
	}

	/* draw frequency spectrum as a bunch of bars */
	static void
	draw_spectrum (gfloat * data)
	{
	gint i;
	GdkRectangle rect = { 0, 0, spect_bands, spect_height };
	cairo_t *cr;

	if (!drawingarea)
	return;

	gdk_window_begin_paint_rect (gtk_widget_get_window (drawingarea), &rect);
	cr = gdk_cairo_create (gtk_widget_get_window (drawingarea));

	cairo_set_source_rgb (cr, 0, 0, 0);
	cairo_rectangle (cr, 0, 0, spect_bands, spect_height);
	cairo_fill (cr);
	for (i = 0; i < spect_bands; i++) {
	cairo_set_source_rgb (cr, 1, 1, 1);
	cairo_rectangle (cr, i, -data[i], 1, spect_height + data[i]);
	cairo_fill (cr);
	}
	cairo_destroy (cr);

	gdk_window_end_paint (gtk_widget_get_window (drawingarea));
	}

	static void
	dynamic_link (GstPadTemplate * templ, GstPad * newpad, gpointer user_data)
	{
	GstPad *target = GST_PAD (user_data);

	gst_pad_link (newpad, target);
	gst_object_unref (target);
	}

	/* receive spectral data from element message */
	static gboolean
	message_handler (GstBus * bus, GstMessage * message, gpointer data)
	{
	if (message->type == GST_MESSAGE_ELEMENT) {
	const GstStructure *s = gst_message_get_structure (message);
	const gchar *name = gst_structure_get_name (s);

	if (strcmp (name, "spectrum") == 0) {
	gfloat *spect = g_new (gfloat, spect_bands);
	const GValue *list;
	const GValue *value;
	guint i;

	list = gst_structure_get_value (s, "magnitude");
	for (i = 0; i < spect_bands; ++i) {
	value = gst_value_list_get_value (list, i);
	spect[i] = height_scale * g_value_get_float (value);
	}
	draw_spectrum (spect);
	g_free (spect);
	}
	}
	return TRUE;
	}

	int
	main (int argc, char *argv[])
	{
	GstElement *bin;
	GstElement decodebin, decconvert;
	GstElement capsfilter, equalizer, spectrum, sinkconvert, *sink;
	GstCaps *caps;
	GstBus *bus;
	GtkWidget appwindow, vbox, hbox, scale;
	int i, num_bands = NBANDS;

	GOptionEntry options[] = {
	{"bands", 'b', 0, G_OPTION_ARG_INT, &num_bands,
	"Number of bands", NULL},
	{NULL}
	};
	GOptionContext *ctx;
	GError *err = NULL;

	ctx = g_option_context_new ("- demo of audio equalizer");
	g_option_context_add_main_entries (ctx, options, NULL);
	g_option_context_add_group (ctx, gst_init_get_option_group ());
	g_option_context_add_group (ctx, gtk_get_option_group (TRUE));

	if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
	g_print ("Error initializing: %s\n", err->message);
	g_option_context_free (ctx);
	g_clear_error (&err);
	exit (1);
	}
	g_option_context_free (ctx);

	if (argc < 2) {
	g_print ("Usage: %s <uri to play>\n", argv[0]);
	g_print (" For optional arguments: --help\n");
	exit (-1);
	}

	gst_init (&argc, &argv);
	gtk_init (&argc, &argv);

	bin = gst_pipeline_new ("bin");

	/* Uri decoding */
	decodebin = gst_element_factory_make ("uridecodebin", "decoder");
	g_object_set (G_OBJECT (decodebin), "uri", argv[1], NULL);

	/* Force float32 samples */
	decconvert = gst_element_factory_make ("audioconvert", "decconvert");
	capsfilter = gst_element_factory_make ("capsfilter", "capsfilter");
	caps =
	gst_caps_new_simple ("audio/x-raw", "format", G_TYPE_STRING, "F32LE",
	NULL);
	g_object_set (capsfilter, "caps", caps, NULL);

	equalizer = gst_element_factory_make ("equalizer-nbands", "equalizer");
	g_object_set (G_OBJECT (equalizer), "num-bands", num_bands, NULL);

	spectrum = gst_element_factory_make ("spectrum", "spectrum");
	g_object_set (G_OBJECT (spectrum), "bands", spect_bands, "threshold", -80,
	"post-messages", TRUE, "interval", 500 * GST_MSECOND, NULL);

	sinkconvert = gst_element_factory_make ("audioconvert", "sinkconvert");

	sink = gst_element_factory_make ("autoaudiosink", "sink");

	gst_bin_add_many (GST_BIN (bin), decodebin, decconvert, capsfilter, equalizer,
	spectrum, sinkconvert, sink, NULL);
	if (!gst_element_link_many (decconvert, capsfilter, equalizer, spectrum,
	sinkconvert, sink, NULL)) {
	fprintf (stderr, "can't link elements\n");
	exit (1);
	}

	/* Handle dynamic pads */
	g_signal_connect (G_OBJECT (decodebin), "pad-added",
	G_CALLBACK (dynamic_link), gst_element_get_static_pad (decconvert,
	"sink"));

	bus = gst_element_get_bus (bin);
	gst_bus_add_watch (bus, message_handler, NULL);
	gst_object_unref (bus);

	appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	gtk_window_set_title (GTK_WINDOW (appwindow), "Equalizer Demo");
	g_signal_connect (G_OBJECT (appwindow), "destroy",
	G_CALLBACK (on_window_destroy), NULL);
	vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);

	drawingarea = gtk_drawing_area_new ();
	gtk_widget_set_size_request (drawingarea, spect_bands, spect_height);
	g_signal_connect (G_OBJECT (drawingarea), "configure-event",
	G_CALLBACK (on_configure_event), (gpointer) spectrum);
	gtk_box_pack_start (GTK_BOX (vbox), drawingarea, TRUE, TRUE, 0);

	hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 20);

	for (i = 0; i < num_bands; i++) {
	GObject *band;
	gdouble freq;
	gdouble bw;
	gdouble gain;
	gchar *label;
	GtkWidget frame, scales_hbox;

	band = gst_child_proxy_get_child_by_index (GST_CHILD_PROXY (equalizer), i);
	g_assert (band != NULL);
	g_object_get (band, "freq", &freq, NULL);
	g_object_get (band, "bandwidth", &bw, NULL);
	g_object_get (band, "gain", &gain, NULL);

	label = g_strdup_printf ("%d Hz", (int) (freq + 0.5));
	frame = gtk_frame_new (label);
	g_free (label);

	scales_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);

	/* Create gain scale */
	scale = gtk_scale_new_with_range (GTK_ORIENTATION_VERTICAL,
	-24.0, 12.0, 0.5);
	gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
	gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
	gtk_range_set_value (GTK_RANGE (scale), gain);
	gtk_widget_set_size_request (scale, 35, 150);
	g_signal_connect (G_OBJECT (scale), "value-changed",
	G_CALLBACK (on_gain_changed), (gpointer) band);
	gtk_box_pack_start (GTK_BOX (scales_hbox), scale, FALSE, FALSE, 0);

	/* Create bandwidth scale */
	scale = gtk_scale_new_with_range (GTK_ORIENTATION_VERTICAL,
	0.0, 20000.0, 5.0);
	gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
	gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
	gtk_range_set_value (GTK_RANGE (scale), bw);
	gtk_widget_set_size_request (scale, 45, 150);
	g_signal_connect (G_OBJECT (scale), "value-changed",
	G_CALLBACK (on_bandwidth_changed), (gpointer) band);
	gtk_box_pack_start (GTK_BOX (scales_hbox), scale, TRUE, TRUE, 0);

	/* Create frequency scale */
	scale = gtk_scale_new_with_range (GTK_ORIENTATION_VERTICAL,
	20.0, 20000.0, 5.0);
	gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
	gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
	gtk_range_set_value (GTK_RANGE (scale), freq);
	gtk_widget_set_size_request (scale, 45, 150);
	g_signal_connect (G_OBJECT (scale), "value-changed",
	G_CALLBACK (on_freq_changed), (gpointer) band);
	gtk_box_pack_start (GTK_BOX (scales_hbox), scale, TRUE, TRUE, 0);

	gtk_container_add (GTK_CONTAINER (frame), scales_hbox);

	gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, TRUE, 0);
	}

	gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);

	gtk_container_add (GTK_CONTAINER (appwindow), vbox);
	gtk_widget_show_all (appwindow);

	gst_element_set_state (bin, GST_STATE_PLAYING);
	gtk_main ();
	gst_element_set_state (bin, GST_STATE_NULL);

	gst_object_unref (bin);

	return 0;
	}