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