mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-17 05:46:36 +00:00
95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/*
|
|
* audio-example.c
|
|
*
|
|
* Builds a pipeline with [ audiotestsource ! autoaudiosink ] and sweeps
|
|
* frequency and volume.
|
|
*
|
|
* Needs gst-plugins-base + gst-plugins-good installed.
|
|
*/
|
|
|
|
#include <gst/gst.h>
|
|
#include <gst/controller/gstinterpolationcontrolsource.h>
|
|
#include <gst/controller/gstdirectcontrolbinding.h>
|
|
|
|
gint
|
|
main (gint argc, gchar ** argv)
|
|
{
|
|
gint res = 1;
|
|
GstElement *src, *sink;
|
|
GstElement *bin;
|
|
GstControlSource *cs1, *cs2;
|
|
GstTimedValueControlSource *tvcs;
|
|
GstClock *clock;
|
|
GstClockID clock_id;
|
|
GstClockReturn wait_ret;
|
|
|
|
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", NULL);
|
|
if (!src) {
|
|
GST_WARNING ("need audiotestsrc from gst-plugins-base");
|
|
goto Error;
|
|
}
|
|
sink = gst_element_factory_make ("autoaudiosink", NULL);
|
|
if (!sink) {
|
|
GST_WARNING ("need autoaudiosink from gst-plugins-good");
|
|
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;
|
|
}
|
|
|
|
/* setup control sources */
|
|
cs1 = gst_interpolation_control_source_new ();
|
|
cs2 = gst_interpolation_control_source_new ();
|
|
|
|
gst_object_add_control_binding (GST_OBJECT_CAST (src),
|
|
gst_direct_control_binding_new (GST_OBJECT_CAST (src), "volume", cs1));
|
|
gst_object_add_control_binding (GST_OBJECT_CAST (src),
|
|
gst_direct_control_binding_new (GST_OBJECT_CAST (src), "freq", cs2));
|
|
|
|
/* set interpolation mode */
|
|
|
|
g_object_set (cs1, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
|
|
g_object_set (cs2, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
|
|
|
|
/* set control values */
|
|
tvcs = (GstTimedValueControlSource *) cs1;
|
|
gst_timed_value_control_source_set (tvcs, 0 * GST_SECOND, 0.0);
|
|
gst_timed_value_control_source_set (tvcs, 5 * GST_SECOND, 1.0);
|
|
|
|
gst_object_unref (cs1);
|
|
|
|
tvcs = (GstTimedValueControlSource *) cs2;
|
|
gst_timed_value_control_source_set (tvcs, 0 * GST_SECOND, 220.0 / 20000.0);
|
|
gst_timed_value_control_source_set (tvcs, 3 * GST_SECOND, 3520.0 / 20000.0);
|
|
gst_timed_value_control_source_set (tvcs, 6 * GST_SECOND, 440.0 / 20000.0);
|
|
|
|
gst_object_unref (cs2);
|
|
|
|
/* run for 7 seconds */
|
|
clock_id =
|
|
gst_clock_new_single_shot_id (clock,
|
|
gst_clock_get_time (clock) + (7 * GST_SECOND));
|
|
|
|
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 (clock);
|
|
gst_object_unref (bin);
|
|
res = 0;
|
|
Error:
|
|
return (res);
|
|
}
|