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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gtk/gtk.h>
#define DEFAULT_AUDIOSRC "alsasrc"
#define SPECT_BANDS 256
static GtkWidget *drawingarea = NULL;
static void
spectrum_chain (GstElement * sink, GstBuffer * buf, GstPad * pad,
gpointer unused)
{
gint i;
guchar *data = buf->data;
gint width = GST_BUFFER_SIZE (buf);
GdkRectangle rect = { 0, 0, width, 50 };
gdk_window_begin_paint_rect (drawingarea->window, &rect);
gdk_draw_rectangle (drawingarea->window, drawingarea->style->black_gc,
TRUE, 0, 0, width, 50);
for (i = 0; i < width; i++) {
gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
TRUE, i, 64 - data[i], 1, data[i]);
}
gdk_window_end_paint (drawingarea->window);
}
int
main (int argc, char *argv[])
{
GstElement *bin;
GstElement *src, *spectrum, *sink;
GtkWidget *appwindow;
gst_init (&argc, &argv);
gtk_init (&argc, &argv);
bin = gst_pipeline_new ("bin");
src = gst_element_factory_make (DEFAULT_AUDIOSRC, "src");
g_object_set (G_OBJECT (src), "blocksize", (gulong) 1024 * 2, NULL);
spectrum = gst_element_factory_make ("spectrum", "spectrum");
g_object_set (G_OBJECT (spectrum), "width", SPECT_BANDS, "threshold", -80,
NULL);
sink = gst_element_factory_make ("fakesink", "sink");
g_object_set (G_OBJECT (sink), "signal-handoffs", TRUE, NULL);
g_signal_connect (sink, "handoff", G_CALLBACK (spectrum_chain), NULL);
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);
}
appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
drawingarea = gtk_drawing_area_new ();
gtk_drawing_area_size (GTK_DRAWING_AREA (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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