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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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193 lines
5.4 KiB
C
193 lines
5.4 KiB
C
/* GStreamer
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*
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* volume.c: sample application to change the volume of a pipeline
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*
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* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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 <math.h>
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#include <gst/gst.h>
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#include <gtk/gtk.h>
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/* global pointer for the scale widget */
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static GtkWidget *elapsed;
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static GtkWidget *scale;
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#ifndef M_LN10
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#define M_LN10 (log(10.0))
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#endif
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static void
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value_changed_callback (GtkWidget * widget, GstElement * volume)
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{
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gdouble value;
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gdouble level;
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value = gtk_range_get_value (GTK_RANGE (widget));
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level = exp (value / 20.0 * M_LN10);
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g_print ("Value: %f dB, level: %f\n", value, level);
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g_object_set (volume, "volume", level, NULL);
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}
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static void
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setup_gui (GstElement * volume)
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{
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GtkWidget *window;
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GtkWidget *vbox;
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GtkWidget *label, *hbox;
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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g_signal_connect (window, "destroy", gtk_main_quit, NULL);
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vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_container_add (GTK_CONTAINER (window), vbox);
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/* elapsed widget */
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hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
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label = gtk_label_new ("Elapsed: ");
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elapsed = gtk_label_new ("0.0");
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gtk_container_add (GTK_CONTAINER (hbox), label);
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gtk_container_add (GTK_CONTAINER (hbox), elapsed);
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gtk_container_add (GTK_CONTAINER (vbox), hbox);
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/* volume */
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hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
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label = gtk_label_new ("volume");
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gtk_container_add (GTK_CONTAINER (hbox), label);
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scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, -90.0, 10.0,
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0.2);
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gtk_range_set_value (GTK_RANGE (scale), 0.0);
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gtk_widget_set_size_request (scale, 100, -1);
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gtk_container_add (GTK_CONTAINER (hbox), scale);
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gtk_container_add (GTK_CONTAINER (vbox), hbox);
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g_signal_connect (scale, "value-changed",
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G_CALLBACK (value_changed_callback), volume);
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gtk_widget_show_all (GTK_WIDGET (window));
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}
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static gboolean
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progress_update (gpointer data)
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{
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GstElement *pipeline = (GstElement *) data;
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gint64 position;
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gchar *position_str;
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if (gst_element_query_position (pipeline, GST_FORMAT_TIME, &position))
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position_str = g_strdup_printf ("%.1f", (gfloat) position / GST_SECOND);
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else
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position_str = g_strdup_printf ("n/a");
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gtk_label_set_text (GTK_LABEL (elapsed), position_str);
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g_free (position_str);
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return TRUE;
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}
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static void
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message_received (GstBus * bus, GstMessage * message, GstPipeline * pipeline)
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{
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const GstStructure *s;
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s = gst_message_get_structure (message);
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g_print ("message from \"%s\" (%s): ",
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GST_STR_NULL (GST_ELEMENT_NAME (GST_MESSAGE_SRC (message))),
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gst_message_type_get_name (GST_MESSAGE_TYPE (message)));
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if (s) {
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gchar *sstr;
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sstr = gst_structure_to_string (s);
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g_print ("%s\n", sstr);
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g_free (sstr);
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} else {
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g_print ("no message details\n");
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}
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}
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static void
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eos_message_received (GstBus * bus, GstMessage * message,
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GstPipeline * pipeline)
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{
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message_received (bus, message, pipeline);
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gtk_main_quit ();
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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 *pipeline = NULL;
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#ifndef GST_DISABLE_PARSE
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GError *error = NULL;
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#endif
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GstElement *volume;
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GstBus *bus;
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#ifdef GST_DISABLE_PARSE
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g_print ("GStreamer was built without pipeline parsing capabilities.\n");
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g_print
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("Please rebuild GStreamer with pipeline parsing capabilities activated to use this example.\n");
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return 1;
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#else
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gst_init (&argc, &argv);
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gtk_init (&argc, &argv);
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pipeline = gst_parse_launchv ((const gchar **) &argv[1], &error);
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if (error) {
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g_print ("pipeline could not be constructed: %s\n", error->message);
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g_print ("Please give a complete pipeline with a 'volume' element.\n");
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g_print ("Example: audiotestsrc ! volume ! %s\n", DEFAULT_AUDIOSINK);
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g_error_free (error);
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return 1;
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}
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#endif
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volume = gst_bin_get_by_name (GST_BIN (pipeline), "volume0");
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if (volume == NULL) {
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g_print ("Please give a pipeline with a 'volume' element in it\n");
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return 1;
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}
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/* setup message handling */
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bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
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gst_bus_add_signal_watch_full (bus, G_PRIORITY_HIGH);
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g_signal_connect (bus, "message::error", (GCallback) message_received,
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pipeline);
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g_signal_connect (bus, "message::warning", (GCallback) message_received,
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pipeline);
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g_signal_connect (bus, "message::eos", (GCallback) eos_message_received,
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pipeline);
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/* setup GUI */
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setup_gui (volume);
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/* go to main loop */
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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g_timeout_add (100, progress_update, pipeline);
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gtk_main ();
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (pipeline);
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gst_object_unref (bus);
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return 0;
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}
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