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Diffstat (limited to 'examples/level/demo.c')
| -rw-r--r-- | examples/level/demo.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/examples/level/demo.c b/examples/level/demo.c new file mode 100644 index 00000000..502f50f7 --- /dev/null +++ b/examples/level/demo.c @@ -0,0 +1,155 @@ +/* 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. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <gst/gst.h> +#include <gtk/gtk.h> + +/* global array for the scale widgets, we'll assume stereo */ +GtkWidget *elapsed; +GtkWidget *scale[2][3]; + +static void +level_callback (GstElement * element, gdouble time, gint channel, + gdouble rms, gdouble peak, gdouble decay) +{ + gchar *label; + + label = g_strdup_printf ("%.3f", time); + gtk_label_set (GTK_LABEL (elapsed), label); + g_free (label); + 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 ("+"); + if (gst_bin_iterate (GST_BIN (pipeline))) + return TRUE; + gtk_main_quit (); + return FALSE; +} + +static void +setup_gui () +{ + GtkWidget *window; + GtkWidget *vbox; + GtkWidget *label, *hbox; + 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); + + /* elapsed widget */ + hbox = gtk_hbox_new (TRUE, 0); + label = gtk_label_new ("Elapsed"); + elapsed = gtk_label_new ("0.000"); + gtk_container_add (GTK_CONTAINER (hbox), label); + gtk_container_add (GTK_CONTAINER (hbox), elapsed); + gtk_container_add (GTK_CONTAINER (vbox), hbox); + + for (c = 0; c < 2; ++c) { + /* 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 ! %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); + + + /* 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; +} |