1 files changed, 123 insertions, 0 deletions
diff --git a/examples/level/plot.c b/examples/level/plot.c
new file mode 100644
index 00000000..6df01065
--- /dev/null
+++ b/examples/level/plot.c
@@ -0,0 +1,123 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * plot.c: output data points to be graphed with gnuplot
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include <gtk/gtk.h>
+
+gboolean got_channel[2] = { FALSE, FALSE };     /* to see if we got the signal for this one yet */
+gint channels = 0;              /* guess at how many channels there are */
+gdouble last_time = 0.0;        /* time of last signal */
+gdouble values[2][3];           /* array of levels from which to print */
+
+static void
+level_callback (GstElement * element, gdouble time, gint channel,
+    gdouble rms, gdouble peak, gdouble decay)
+{
+  int i = 0, j = 0;
+  gboolean got_all = FALSE;
+
+  if (channel + 1 > channels)
+    channels = channel + 1;
+
+  /* reset got_channel if this is a new time point */
+  if (time > last_time) {
+    for (i = 0; i < channels; ++i)
+      got_channel[i] = FALSE;
+    last_time = time;
+  }
+
+  /* store values */
+  got_channel[channel] = TRUE;
+  values[channel][0] = rms;
+  values[channel][1] = peak;
+  values[channel][2] = decay;
+
+  /* check if we have all channels, and output if we do */
+  /* FIXME: this fails on the first, no ? */
+  got_all = TRUE;
+  for (i = 0; i < channels; ++i)
+    if (!got_channel[i])
+      got_all = FALSE;
+  if (got_all) {
+    g_print ("%f ", time);
+    for (i = 0; i < channels; ++i)
+      for (j = 0; j < 3; ++j)
+        g_print ("%f ", values[i][j]);
+    g_print ("\n");
+  }
+}
+
+static gboolean
+idler (gpointer data)
+{
+  GstElement *pipeline = GST_ELEMENT (data);
+
+  if (gst_bin_iterate (GST_BIN (pipeline)))
+    return TRUE;
+
+  gtk_main_quit ();
+  return FALSE;
+}
+
+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 ! %s\n", DEFAULT_AUDIOSINK);
+    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);
+
+
+  /* go to main loop */
+  gst_element_set_state (pipeline, GST_STATE_PLAYING);
+  g_idle_add (idler, pipeline);
+
+  gtk_main ();
+
+  return 0;
+}