mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-07-07 07:05:52 +00:00
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/* GStreamer
|
|
*
|
|
* Copyright (C) 2006 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.
|
|
*/
|
|
|
|
/* compile with :
|
|
* gcc -Wall $(pkg-config --cflags --libs gstreamer-0.10 gstreamer-controller-0.10) pitch.c -o pitch
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <gst/gst.h>
|
|
#include <gst/controller/gstcontroller.h>
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
GMainLoop *loop;
|
|
gint i;
|
|
|
|
GstElement *audiotestsrc;
|
|
GstElement *audioconvert1, *audioconvert2;
|
|
GstElement *pitch;
|
|
GstElement *sink;
|
|
GstElement *pipeline;
|
|
GstController *ctl;
|
|
GstInterpolationControlSource *csource;
|
|
GValue val = { 0, };
|
|
|
|
if (argc != 2) {
|
|
g_printerr ("Usage: %s <audiosink>\n", argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
/* initialize GStreamer */
|
|
gst_init (&argc, &argv);
|
|
gst_controller_init (&argc, &argv);
|
|
|
|
loop = g_main_loop_new (NULL, FALSE);
|
|
|
|
pipeline = gst_pipeline_new ("audio-player");
|
|
audiotestsrc = gst_element_factory_make ("audiotestsrc", "audiotestsrc");
|
|
g_assert (audiotestsrc != NULL);
|
|
audioconvert1 = gst_element_factory_make ("audioconvert", "audioconvert1");
|
|
g_assert (audioconvert1 != NULL);
|
|
audioconvert2 = gst_element_factory_make ("audioconvert", "audioconvert2");
|
|
g_assert (audioconvert2 != NULL);
|
|
pitch = gst_element_factory_make ("pitch", "pitch");
|
|
g_assert (pitch != NULL);
|
|
sink = gst_element_factory_make (argv[1], "sink");
|
|
g_assert (sink != NULL);
|
|
|
|
gst_bin_add_many (GST_BIN (pipeline),
|
|
audiotestsrc, audioconvert1, pitch, audioconvert2, sink, NULL);
|
|
gst_element_link_many (audiotestsrc, audioconvert1, pitch, audioconvert2,
|
|
sink, NULL);
|
|
|
|
if (!(ctl = gst_controller_new (G_OBJECT (pitch), "pitch", NULL))) {
|
|
g_print ("can't control pitch element\n");
|
|
return -1;
|
|
}
|
|
|
|
csource = gst_interpolation_control_source_new ();
|
|
gst_interpolation_control_source_set_interpolation_mode (csource,
|
|
GST_INTERPOLATE_LINEAR);
|
|
|
|
gst_controller_set_control_source (ctl, "pitch",
|
|
GST_CONTROL_SOURCE (csource));
|
|
|
|
|
|
g_value_init (&val, G_TYPE_FLOAT);
|
|
|
|
for (i = 0; i < 100; ++i) {
|
|
if (i % 2)
|
|
g_value_set_float (&val, 0.5);
|
|
else
|
|
g_value_set_float (&val, 1.5);
|
|
|
|
gst_interpolation_control_source_set (csource, i * GST_SECOND, &val);
|
|
}
|
|
|
|
g_value_unset (&val);
|
|
|
|
gst_element_set_state (pipeline, GST_STATE_PLAYING);
|
|
g_print ("Running\n");
|
|
g_main_loop_run (loop);
|
|
|
|
/* set up a controller */
|
|
|
|
/* clean up nicely */
|
|
g_print ("Returned, stopping playback\n");
|
|
gst_element_set_state (pipeline, GST_STATE_NULL);
|
|
g_print ("Deleting pipeline\n");
|
|
gst_object_unref (GST_OBJECT (pipeline));
|
|
|
|
g_object_unref (csource);
|
|
g_object_unref (ctl);
|
|
|
|
return 0;
|
|
}
|