mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-19 08:11:16 +00:00
faf31366ab
Make that implizit with attaching/detaching controlsources. This is a lot easier and has less invalid state (controlled property without control source).
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
|
|
* audio-example.c
|
|
*
|
|
* Builds a pipeline with audiotestsource->alsasink and sweeps frequency and
|
|
* volume.
|
|
*
|
|
* Needs gst-plugin-base installed.
|
|
*/
|
|
|
|
#include <gst/gst.h>
|
|
#include <gst/controller/gstinterpolationcontrolsource.h>
|
|
|
|
gint
|
|
main (gint argc, gchar ** argv)
|
|
{
|
|
gint res = 1;
|
|
GstElement *src, *sink;
|
|
GstElement *bin;
|
|
GstInterpolationControlSource *csource1, *csource2;
|
|
GstClock *clock;
|
|
GstClockID clock_id;
|
|
GstClockReturn wait_ret;
|
|
GValue vol = { 0, };
|
|
|
|
gst_init (&argc, &argv);
|
|
|
|
/* build pipeline */
|
|
bin = gst_pipeline_new ("pipeline");
|
|
clock = gst_pipeline_get_clock (GST_PIPELINE (bin));
|
|
src = gst_element_factory_make ("audiotestsrc", "gen_audio");
|
|
if (!src) {
|
|
GST_WARNING ("need audiotestsrc from gst-plugins-base");
|
|
goto Error;
|
|
}
|
|
sink = gst_element_factory_make ("autoaudiosink", "play_audio");
|
|
if (!sink) {
|
|
GST_WARNING ("need autoaudiosink from gst-plugins-base");
|
|
goto Error;
|
|
}
|
|
|
|
gst_bin_add_many (GST_BIN (bin), src, sink, NULL);
|
|
if (!gst_element_link (src, sink)) {
|
|
GST_WARNING ("can't link elements");
|
|
goto Error;
|
|
}
|
|
|
|
/* square wave
|
|
g_object_set (G_OBJECT(src), "wave", 1, NULL);
|
|
*/
|
|
|
|
csource1 = gst_interpolation_control_source_new ();
|
|
csource2 = gst_interpolation_control_source_new ();
|
|
|
|
gst_object_set_control_source (GST_OBJECT (src), "volume",
|
|
GST_CONTROL_SOURCE (csource1));
|
|
gst_object_set_control_source (GST_OBJECT (src), "freq",
|
|
GST_CONTROL_SOURCE (csource2));
|
|
|
|
/* Set interpolation mode */
|
|
|
|
gst_interpolation_control_source_set_interpolation_mode (csource1,
|
|
GST_INTERPOLATE_LINEAR);
|
|
gst_interpolation_control_source_set_interpolation_mode (csource2,
|
|
GST_INTERPOLATE_LINEAR);
|
|
|
|
/* set control values */
|
|
g_value_init (&vol, G_TYPE_DOUBLE);
|
|
g_value_set_double (&vol, 0.0);
|
|
gst_interpolation_control_source_set (csource1, 0 * GST_SECOND, &vol);
|
|
g_value_set_double (&vol, 1.0);
|
|
gst_interpolation_control_source_set (csource1, 5 * GST_SECOND, &vol);
|
|
|
|
g_object_unref (csource1);
|
|
|
|
g_value_set_double (&vol, 220.0);
|
|
gst_interpolation_control_source_set (csource2, 0 * GST_SECOND, &vol);
|
|
g_value_set_double (&vol, 3520.0);
|
|
gst_interpolation_control_source_set (csource2, 3 * GST_SECOND, &vol);
|
|
g_value_set_double (&vol, 440.0);
|
|
gst_interpolation_control_source_set (csource2, 6 * GST_SECOND, &vol);
|
|
|
|
g_object_unref (csource2);
|
|
|
|
clock_id =
|
|
gst_clock_new_single_shot_id (clock,
|
|
gst_clock_get_time (clock) + (7 * GST_SECOND));
|
|
|
|
/* run for 7 seconds */
|
|
if (gst_element_set_state (bin, GST_STATE_PLAYING)) {
|
|
if ((wait_ret = gst_clock_id_wait (clock_id, NULL)) != GST_CLOCK_OK) {
|
|
GST_WARNING ("clock_id_wait returned: %d", wait_ret);
|
|
}
|
|
gst_element_set_state (bin, GST_STATE_NULL);
|
|
}
|
|
|
|
/* cleanup */
|
|
gst_clock_id_unref (clock_id);
|
|
gst_object_unref (G_OBJECT (clock));
|
|
gst_object_unref (G_OBJECT (bin));
|
|
res = 0;
|
|
Error:
|
|
return (res);
|
|
}
|