mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-24 18:51:11 +00:00
a214f5bf7b
Original commit message from CVS: 2005-05-09 Andy Wingo <wingo@pobox.com> * gst/volume/Makefile.am: * gst/volume/demo.c * gst/volume/gstvolume.h * gst/volume/gstvolume.c: Port to 0.9 API, derive from basetransform. Probably need an audio filter base class.
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/* GStreamer
|
|
*
|
|
* demo.c: sample application to change the volume of a pipeline
|
|
*
|
|
* Copyright (C) <2004> 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 <math.h>
|
|
|
|
#include <gst/gst.h>
|
|
#include <gtk/gtk.h>
|
|
|
|
/* global pointer for the scale widget */
|
|
GtkWidget *elapsed;
|
|
GtkWidget *scale;
|
|
|
|
#ifndef M_LN10
|
|
#define M_LN10 (log(10.0))
|
|
#endif
|
|
|
|
static void
|
|
value_changed_callback (GtkWidget * widget, GstElement * volume)
|
|
{
|
|
gdouble value;
|
|
gdouble level;
|
|
|
|
value = gtk_range_get_value (GTK_RANGE (widget));
|
|
level = exp (value / 20.0 * M_LN10);
|
|
g_print ("Value: %f dB, level: %f\n", value, level);
|
|
g_object_set (volume, "volume", level, NULL);
|
|
}
|
|
|
|
static void
|
|
setup_gui (GstElement * volume)
|
|
{
|
|
GtkWidget *window;
|
|
GtkWidget *vbox;
|
|
GtkWidget *label, *hbox;
|
|
|
|
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);
|
|
|
|
/* volume */
|
|
hbox = gtk_hbox_new (TRUE, 0);
|
|
label = gtk_label_new ("volume");
|
|
gtk_container_add (GTK_CONTAINER (hbox), label);
|
|
scale = gtk_hscale_new_with_range (-90.0, 10.0, 0.2);
|
|
gtk_range_set_value (GTK_RANGE (scale), 0.0);
|
|
gtk_widget_set_size_request (scale, 100, -1);
|
|
gtk_container_add (GTK_CONTAINER (hbox), scale);
|
|
gtk_container_add (GTK_CONTAINER (vbox), hbox);
|
|
g_signal_connect (scale, "value-changed",
|
|
G_CALLBACK (value_changed_callback), volume);
|
|
|
|
gtk_widget_show_all (GTK_WIDGET (window));
|
|
}
|
|
|
|
int
|
|
main (int argc, char *argv[])
|
|
{
|
|
|
|
GstElement *pipeline = NULL;
|
|
GError *error = NULL;
|
|
GstElement *volume;
|
|
|
|
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 'volume' element.\n");
|
|
g_print ("Example: sinesrc ! volume ! %s\n", DEFAULT_AUDIOSINK);
|
|
g_error_free (error);
|
|
return 1;
|
|
}
|
|
|
|
volume = gst_bin_get_by_name (GST_BIN (pipeline), "volume0");
|
|
if (volume == NULL) {
|
|
g_print ("Please give a pipeline with a 'volume' element in it\n");
|
|
return 1;
|
|
}
|
|
|
|
/* setup GUI */
|
|
setup_gui (volume);
|
|
|
|
/* go to main loop */
|
|
gst_element_set_state (pipeline, GST_STATE_PLAYING);
|
|
gst_bus_poll (gst_element_get_bus (pipeline),
|
|
GST_MESSAGE_EOS | GST_MESSAGE_ERROR, -1);
|
|
gst_element_set_state (pipeline, GST_STATE_NULL);
|
|
|
|
return 0;
|
|
}
|