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209 lines
6.2 KiB
C
209 lines
6.2 KiB
C
/* GStreamer
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*
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* audiomix.c: sample audio mixing application
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*
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* Copyright (C) 2011 Stefan Sauer <ensonic@users.sf.net>
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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 <string.h>
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#include <gst/gst.h>
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#include <gtk/gtk.h>
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/* global items for the interaction */
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static GtkWidget *scale;
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static GObject *volumes[2];
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static gint num_vol = 0;
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static void
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value_changed_callback (GtkWidget * widget, gpointer * user_data)
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{
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gdouble value = gtk_range_get_value (GTK_RANGE (widget));
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g_object_set (volumes[0], "volume", 1.0 - value, NULL);
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g_object_set (volumes[1], "volume", value, NULL);
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}
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static void
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setup_gui (GstElement * volume, gchar * file_name1, gchar * file_name2)
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{
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GtkWidget *window, *layout, *label;
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gchar *name, *ext;
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_title (GTK_WINDOW (window), "audiomix");
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g_signal_connect (window, "destroy", gtk_main_quit, NULL);
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layout = gtk_grid_new ();
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g_object_set (G_OBJECT (layout), "column-spacing", 6, NULL);
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gtk_container_add (GTK_CONTAINER (window), layout);
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/* channel labels */
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name = g_path_get_basename (file_name1);
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if ((ext = strrchr (name, '.')))
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*ext = '\0';
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label = gtk_label_new (name);
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g_free (name);
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gtk_grid_attach (GTK_GRID (layout), label, 0, 0, 1, 1);
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gtk_grid_attach (GTK_GRID (layout), gtk_label_new ("|"), 1, 0, 1, 1);
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name = g_path_get_basename (file_name2);
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if ((ext = strrchr (name, '.')))
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*ext = '\0';
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label = gtk_label_new (name);
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g_free (name);
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gtk_grid_attach (GTK_GRID (layout), label, 2, 0, 1, 1);
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/* mix slider */
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scale =
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gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0.0, 1.0,
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1.0 / 200.0);
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gtk_range_set_value (GTK_RANGE (scale), 0.0);
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gtk_widget_set_size_request (scale, 200, -1);
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gtk_widget_set_hexpand (scale, TRUE);
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gtk_grid_attach (GTK_GRID (layout), scale, 0, 1, 3, 1);
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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 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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static void
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dynamic_link (GstPadTemplate * templ, GstPad * newpad, gpointer user_data)
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{
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GstPad *target = GST_PAD (user_data);
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gst_pad_link (newpad, target);
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gst_object_unref (target);
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}
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static void
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make_mixer_channel (GstElement * pipeline, GstElement * mix, gchar * file_name)
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{
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GstElement *filesrc, *decodebin, *volume, *convert, *format;
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GstCaps *caps;
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/* prepare mixer channel */
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filesrc = gst_element_factory_make ("filesrc", NULL);
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decodebin = gst_element_factory_make ("decodebin", NULL);
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volume = gst_element_factory_make ("volume", NULL);
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convert = gst_element_factory_make ("audioconvert", NULL);
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format = gst_element_factory_make ("capsfilter", NULL);
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gst_bin_add_many (GST_BIN (pipeline), filesrc, decodebin, volume, convert,
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format, NULL);
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gst_element_link (filesrc, decodebin);
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gst_element_link_many (volume, convert, format, mix, NULL);
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/* configure elements */
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g_object_set (filesrc, "location", file_name, NULL);
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g_object_set (volume, "volume", (num_vol == 0) ? 1.0 : 0.0, NULL);
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caps = gst_caps_from_string ("audio/x-raw, "
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"format = (string) S16LE, " "channels = (int) 2");
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g_object_set (format, "caps", caps, NULL);
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gst_caps_unref (caps);
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/* remember volume element */
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volumes[num_vol++] = (GObject *) volume;
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/* handle dynamic pads */
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g_signal_connect (G_OBJECT (decodebin), "pad-added",
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G_CALLBACK (dynamic_link), gst_element_get_static_pad (volume, "sink"));
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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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GstElement *mix, *convert, *sink;
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GstBus *bus;
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if (argc < 3) {
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g_print ("Usage: audiomix <file1> <file2>\n");
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return 1;
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}
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gst_init (&argc, &argv);
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gtk_init (&argc, &argv);
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/* prepare tail of pipeline */
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pipeline = gst_pipeline_new ("audiomix");
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mix = gst_element_factory_make ("adder", NULL);
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convert = gst_element_factory_make ("audioconvert", NULL);
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sink = gst_element_factory_make ("autoaudiosink", NULL);
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gst_bin_add_many (GST_BIN (pipeline), mix, convert, sink, NULL);
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gst_element_link_many (mix, convert, sink, NULL);
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/* prepare mixer channel strips */
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make_mixer_channel (pipeline, mix, argv[1]);
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make_mixer_channel (pipeline, mix, argv[2]);
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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 (pipeline, argv[1], argv[2]);
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/* go to main loop */
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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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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