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/* GStreamer
* Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include <gtk/gtk.h>
#define DEFAULT_AUDIOSRC "alsasrc"
#define SPECT_BANDS 256
static GtkWidget *drawingarea = NULL;
static void
on_window_destroy (GtkObject * object, gpointer user_data)
{
drawingarea = NULL;
gtk_main_quit ();
}
/* draw frequency spectrum as a bunch of bars */
static void
draw_spectrum (guchar * data)
{
gint i;
GdkRectangle rect = { 0, 0, SPECT_BANDS, 50 };
if (!drawingarea)
return;
gdk_window_begin_paint_rect (drawingarea->window, &rect);
gdk_draw_rectangle (drawingarea->window, drawingarea->style->black_gc,
TRUE, 0, 0, SPECT_BANDS, 50);
for (i = 0; i < SPECT_BANDS; i++) {
gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
TRUE, i, 64 - data[i], 1, data[i]);
}
gdk_window_end_paint (drawingarea->window);
}
/* receive spectral data from element message */
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) {
guchar spect[SPECT_BANDS];
const GValue *list;
const GValue *value;
guint i;
list = gst_structure_get_value (s, "spectrum");
for (i = 0; i < SPECT_BANDS; ++i) {
value = gst_value_list_get_value (list, i);
spect[i] = g_value_get_uchar (value);
}
draw_spectrum (spect);
}
}
/* we handled the message we want, and ignored the ones we didn't want.
* so the core can unref the message for us */
return TRUE;
}
int
main (int argc, char *argv[])
{
GstElement *bin;
GstElement *src, *spectrum, *sink;
GstBus *bus;
GtkWidget *appwindow;
gst_init (&argc, &argv);
gtk_init (&argc, &argv);
bin = gst_pipeline_new ("bin");
src = gst_element_factory_make (DEFAULT_AUDIOSRC, "src");
spectrum = gst_element_factory_make ("spectrum", "spectrum");
g_object_set (G_OBJECT (spectrum), "bands", SPECT_BANDS, "threshold", -80,
"message", TRUE, NULL);
sink = gst_element_factory_make ("fakesink", "sink");
gst_bin_add_many (GST_BIN (bin), src, spectrum, sink, NULL);
if (!gst_element_link_many (src, spectrum, sink, NULL)) {
fprintf (stderr, "cant link elements\n");
exit (1);
}
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);
g_signal_connect (G_OBJECT (appwindow), "destroy",
G_CALLBACK (on_window_destroy), NULL);
drawingarea = gtk_drawing_area_new ();
gtk_widget_set_size_request (drawingarea, SPECT_BANDS, 64);
gtk_container_add (GTK_CONTAINER (appwindow), drawingarea);
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;
}
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