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85c849417d
Original commit message from CVS: * gst/spectrum/demo-audiotest.c: (message_handler): * gst/spectrum/demo-osssrc.c: (message_handler): Remove two obsolete and confusing comments.
134 lines
3.8 KiB
C
134 lines
3.8 KiB
C
/* GStreamer
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* Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <math.h>
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#include <gst/gst.h>
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#include <gtk/gtk.h>
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#define DEFAULT_AUDIOSRC "alsasrc"
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#define SPECT_BANDS 256
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#define SPECT_WIDTH (SPECT_BANDS)
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#define SPECT_HEIGHT 64
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static GtkWidget *drawingarea = NULL;
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static void
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on_window_destroy (GtkObject * object, gpointer user_data)
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{
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drawingarea = NULL;
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gtk_main_quit ();
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}
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/* draw frequency spectrum as a bunch of bars */
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static void
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draw_spectrum (guchar * data)
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{
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gint i;
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GdkRectangle rect = { 0, 0, SPECT_WIDTH, SPECT_HEIGHT };
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if (!drawingarea)
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return;
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gdk_window_begin_paint_rect (drawingarea->window, &rect);
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gdk_draw_rectangle (drawingarea->window, drawingarea->style->black_gc,
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TRUE, 0, 0, SPECT_BANDS, SPECT_HEIGHT);
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for (i = 0; i < SPECT_BANDS; i++) {
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gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
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TRUE, i, SPECT_HEIGHT - data[i], 1, data[i]);
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}
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gdk_window_end_paint (drawingarea->window);
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}
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/* receive spectral data from element message */
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gboolean
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message_handler (GstBus * bus, GstMessage * message, gpointer data)
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{
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if (message->type == GST_MESSAGE_ELEMENT) {
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const GstStructure *s = gst_message_get_structure (message);
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const gchar *name = gst_structure_get_name (s);
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if (strcmp (name, "spectrum") == 0) {
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guchar spect[SPECT_BANDS];
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const GValue *list;
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const GValue *value;
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guint i;
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list = gst_structure_get_value (s, "spectrum");
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for (i = 0; i < SPECT_BANDS; ++i) {
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value = gst_value_list_get_value (list, i);
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spect[i] = g_value_get_uchar (value);
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}
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draw_spectrum (spect);
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}
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}
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return TRUE;
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}
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int
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main (int argc, char *argv[])
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{
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GstElement *bin;
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GstElement *src, *spectrum, *sink;
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GstBus *bus;
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GtkWidget *appwindow;
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gst_init (&argc, &argv);
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gtk_init (&argc, &argv);
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bin = gst_pipeline_new ("bin");
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src = gst_element_factory_make (DEFAULT_AUDIOSRC, "src");
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spectrum = gst_element_factory_make ("spectrum", "spectrum");
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g_object_set (G_OBJECT (spectrum), "bands", SPECT_BANDS, "threshold", -80,
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"message", TRUE, NULL);
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sink = gst_element_factory_make ("fakesink", "sink");
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gst_bin_add_many (GST_BIN (bin), src, spectrum, sink, NULL);
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if (!gst_element_link_many (src, spectrum, sink, NULL)) {
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fprintf (stderr, "cant link elements\n");
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exit (1);
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}
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bus = gst_element_get_bus (bin);
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gst_bus_add_watch (bus, message_handler, NULL);
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gst_object_unref (bus);
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appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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g_signal_connect (G_OBJECT (appwindow), "destroy",
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G_CALLBACK (on_window_destroy), NULL);
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drawingarea = gtk_drawing_area_new ();
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gtk_widget_set_size_request (drawingarea, SPECT_WIDTH, SPECT_HEIGHT);
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gtk_container_add (GTK_CONTAINER (appwindow), drawingarea);
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gtk_widget_show_all (appwindow);
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gst_element_set_state (bin, GST_STATE_PLAYING);
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gtk_main ();
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gst_element_set_state (bin, GST_STATE_NULL);
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gst_object_unref (bin);
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return 0;
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}
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