build demo app

Original commit message from CVS:
build demo app

diff --git a/gst/level/Makefile.am b/gst/level/Makefile.am
index 27ba3e3..cb3ee73 100644 (file)
--- a/gst/level/Makefile.am
+++ b/gst/level/Makefile.am
@@ -8,10 +8,12 @@ libgstlevel_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 
 noinst_HEADERS = gstlevel.h filter.func
 
+if HAVE_GTK
 noinst_PROGRAMS = demo
 demo_SOURCES = demo.c
 demo_CFLAGS = $(GTK_CFLAGS) $(GST_CFLAGS)
 demo_LDFLAGS = $(GTK_LIBS) $(GST_LIBS)
+endif
 
 EXTRA_libgstlevel_la_SOURCES = gstlevel-marshal.list
 

diff --git a/gst/level/demo.c b/gst/level/demo.c
new file mode 100644 (file)
index 0000000..d1c6905
--- /dev/null
+++ b/gst/level/demo.c
@@ -0,0 +1,137 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * demo.c: sample application to display VU meter-like output of level
+ * Copyright (C) 2003
+ *           Thomas Vander Stichele <thomas at apestaart dot 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <gst/gst.h>
+#include <gtk/gtk.h>
+
+/* global array for the scale widgets, we'll assume stereo */
+GtkWidget *scale[2][3];
+
+static void
+level_callback (GstElement *element, gint channel,
+                gdouble rms, gdouble peak, gdouble decay)
+{
+  gtk_range_set_value (GTK_RANGE (scale[channel][0]), rms);
+  gtk_range_set_value (GTK_RANGE (scale[channel][1]), peak);
+  gtk_range_set_value (GTK_RANGE (scale[channel][2]), decay);
+}
+
+static gboolean
+idler (gpointer data)
+{
+  GstElement *pipeline = GST_ELEMENT (data);
+  g_print ("+");
+  return gst_bin_iterate (GST_BIN (pipeline));
+}
+
+static void
+setup_gui ()
+{
+  GtkWidget *window;
+  GtkWidget *vbox;
+  int c;
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  g_signal_connect (window, "destroy", gtk_main_quit, NULL);
+
+  vbox = gtk_vbox_new (TRUE, 0);
+  gtk_container_add (GTK_CONTAINER (window), vbox);
+  for (c = 0; c < 2; ++c)
+  {
+    GtkWidget *label, *hbox;
+
+    /* RMS */
+    hbox = gtk_hbox_new (TRUE, 0);
+    label = gtk_label_new ("RMS");
+    gtk_container_add (GTK_CONTAINER (hbox), label);
+    scale[c][0] = gtk_hscale_new_with_range (-90.0, 0.0, 0.2);
+    gtk_widget_set_size_request (scale[c][0], 100, -1);
+    gtk_container_add (GTK_CONTAINER (hbox), scale[c][0]);
+    gtk_container_add (GTK_CONTAINER (vbox), hbox);
+    /* peak */
+    hbox = gtk_hbox_new (TRUE, 0);
+    label = gtk_label_new ("peak");
+    gtk_container_add (GTK_CONTAINER (hbox), label);
+    scale[c][1] = gtk_hscale_new_with_range (-90.0, 0.0, 0.2);
+    gtk_widget_set_size_request (scale[c][1], 100, -1);
+    gtk_container_add (GTK_CONTAINER (hbox), scale[c][1]);
+    gtk_container_add (GTK_CONTAINER (vbox), hbox);
+    /* decay */
+    hbox = gtk_hbox_new (TRUE, 0);
+    label = gtk_label_new ("decaying peek");
+    gtk_container_add (GTK_CONTAINER (hbox), label);
+    scale[c][2] = gtk_hscale_new_with_range (-90.0, 0.0, 0.2);
+    gtk_widget_set_size_request (scale[c][2], 100, -1);
+    gtk_container_add (GTK_CONTAINER (hbox), scale[c][2]);
+    gtk_container_add (GTK_CONTAINER (vbox), hbox);
+  }
+
+  gtk_widget_show_all (GTK_WIDGET (window));
+}
+
+int main
+(int argc, char *argv[])
+{
+
+  GstElement *pipeline = NULL;
+  GError *error = NULL;
+  GstElement *level;
+
+  gst_init (&argc, &argv);
+  gtk_init (&argc, &argv);
+
+  pipeline = gst_parse_launchv ((const gchar **) &argv[1], &error);
+  if (error)
+  {
+    g_print ("pipeline could not be constructed: %s\n", error->message);
+    g_print ("Please give a complete pipeline  with a 'level' element.\n");
+    g_print ("Example: sinesrc ! level ! osssink\n");
+    g_error_free (error);
+    return 1;
+  }
+
+  level = gst_bin_get_by_name (GST_BIN (pipeline), "level0");
+  if (level == NULL)
+  {
+    g_print ("Please give a pipeline with a 'level' element in it\n");
+    return 1;
+  }
+
+  g_object_set (level, "signal", TRUE, NULL);
+  g_signal_connect (level, "level", G_CALLBACK (level_callback), NULL);
+
+  
+  /* setup GUI */
+  setup_gui ();
+
+  /* connect level signal */
+
+  /* go to main loop */
+  gst_element_set_state (pipeline, GST_STATE_PLAYING);
+  g_idle_add (idler, pipeline);
+
+  gtk_main ();
+
+  return 0;
+}
+