mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-22 16:26:39 +00:00
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
|
|
* text-color-example.c
|
|
*
|
|
* Builds a pipeline with [videotestsrc ! textoverlay ! ximagesink] and
|
|
* moves text
|
|
*
|
|
* Needs gst-plugins-base installed.
|
|
*/
|
|
|
|
#include <gst/gst.h>
|
|
#include <gst/controller/gstinterpolationcontrolsource.h>
|
|
#include <gst/controller/gstlfocontrolsource.h>
|
|
#include <gst/controller/gstargbcontrolbinding.h>
|
|
#include <gst/controller/gstdirectcontrolbinding.h>
|
|
|
|
gint
|
|
main (gint argc, gchar ** argv)
|
|
{
|
|
gint res = 1;
|
|
GstElement *src, *text, *sink;
|
|
GstElement *bin;
|
|
GstControlSource *cs;
|
|
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 ("videotestsrc", NULL);
|
|
if (!src) {
|
|
GST_WARNING ("need videotestsrc from gst-plugins-base");
|
|
goto Error;
|
|
}
|
|
g_object_set (src, "pattern", /* red */ 4,
|
|
NULL);
|
|
text = gst_element_factory_make ("textoverlay", NULL);
|
|
if (!text) {
|
|
GST_WARNING ("need textoverlay from gst-plugins-base");
|
|
goto Error;
|
|
}
|
|
g_object_set (text,
|
|
"text", "GStreamer rocks!",
|
|
"font-desc", "Sans, 30",
|
|
"xpos", 0.0, "wrap-mode", -1, "halignment", /* position */ 4,
|
|
"valignment", /* position */ 3,
|
|
NULL);
|
|
sink = gst_element_factory_make ("ximagesink", NULL);
|
|
if (!sink) {
|
|
GST_WARNING ("need ximagesink from gst-plugins-base");
|
|
goto Error;
|
|
}
|
|
|
|
gst_bin_add_many (GST_BIN (bin), src, text, sink, NULL);
|
|
if (!gst_element_link_many (src, text, sink, NULL)) {
|
|
GST_WARNING ("can't link elements");
|
|
goto Error;
|
|
}
|
|
|
|
/* setup control sources */
|
|
cs = gst_interpolation_control_source_new ();
|
|
gst_object_add_control_binding (GST_OBJECT_CAST (text),
|
|
gst_direct_control_binding_new_absolute (GST_OBJECT_CAST (text), "deltax",
|
|
cs));
|
|
|
|
g_object_set (cs, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
|
|
|
|
// At second 0 the text will be at 0px on the x-axis
|
|
gst_timed_value_control_source_set ((GstTimedValueControlSource *) cs, 0, 0);
|
|
// At second 5 the text will be at 1000px on the x-axis
|
|
gst_timed_value_control_source_set ((GstTimedValueControlSource *) cs,
|
|
GST_SECOND * 5, 1000);
|
|
|
|
gst_object_unref (cs);
|
|
|
|
/* run for 10 seconds */
|
|
clock_id =
|
|
gst_clock_new_single_shot_id (clock,
|
|
gst_clock_get_time (clock) + (10 * 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 (G_OBJECT (clock));
|
|
gst_object_unref (G_OBJECT (bin));
|
|
res = 0;
|
|
Error:
|
|
return (res);
|
|
}
|