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#include <gst/gst.h>
#define SWITCH_TIMEOUT 1
#define NUM_VIDEO_BUFFERS 500
static GMainLoop *loop;
/* Output selector src pads */
static GstPad *osel_src1 = NULL;
static GstPad *osel_src2 = NULL;
static gboolean
my_bus_callback (GstBus * bus, GstMessage * message, gpointer data)
{
g_print ("Got %s message\n", GST_MESSAGE_TYPE_NAME (message));
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:{
GError *err;
gchar *debug;
gst_message_parse_error (message, &err, &debug);
g_print ("Error: %s\n", err->message);
g_error_free (err);
g_free (debug);
g_main_loop_quit (loop);
break;
}
case GST_MESSAGE_EOS:
/* end-of-stream */
g_main_loop_quit (loop);
break;
default:
/* unhandled message */
break;
}
/* we want to be notified again the next time there is a message
* on the bus, so returning TRUE (FALSE means we want to stop watching
* for messages on the bus and our callback should not be called again)
*/
return TRUE;
}
static gboolean
switch_cb (gpointer user_data)
{
GstElement *sel = GST_ELEMENT (user_data);
GstPad *old_pad, *new_pad = NULL;
g_object_get (G_OBJECT (sel), "active-pad", &old_pad, NULL);
if (old_pad == osel_src1)
new_pad = osel_src2;
else
new_pad = osel_src1;
g_object_set (G_OBJECT (sel), "active-pad", new_pad, NULL);
g_print ("switched from %s:%s to %s:%s\n", GST_DEBUG_PAD_NAME (old_pad),
GST_DEBUG_PAD_NAME (new_pad));
gst_object_unref (old_pad);
return TRUE;
}
static void
on_bin_element_added (GstBin * bin, GstElement * element, gpointer user_data)
{
g_object_set (G_OBJECT (element), "sync", FALSE, "async", FALSE, NULL);
}
gint
main (gint argc, gchar * argv[])
{
GstElement *pipeline, *src, *toverlay, *osel, *sink1, *sink2, *c1, *c2, *c0;
GstPad *sinkpad;
GstBus *bus;
/* init GStreamer */
gst_init (&argc, &argv);
loop = g_main_loop_new (NULL, FALSE);
/* create elements */
pipeline = gst_element_factory_make ("pipeline", "pipeline");
src = gst_element_factory_make ("videotestsrc", "src");
c0 = gst_element_factory_make ("videoconvert", NULL);
toverlay = gst_element_factory_make ("timeoverlay", "timeoverlay");
osel = gst_element_factory_make ("output-selector", "osel");
c1 = gst_element_factory_make ("videoconvert", NULL);
c2 = gst_element_factory_make ("videoconvert", NULL);
sink1 = gst_element_factory_make ("autovideosink", "sink1");
sink2 = gst_element_factory_make ("autovideosink", "sink2");
if (!pipeline || !src || !c0 || !toverlay || !osel || !c1 || !c2 || !sink1 ||
!sink2) {
g_print ("missing element\n");
return -1;
}
/* add them to bin */
gst_bin_add_many (GST_BIN (pipeline), src, c0, toverlay, osel, c1, sink1, c2,
sink2, NULL);
/* set properties */
g_object_set (G_OBJECT (src), "is-live", TRUE, NULL);
g_object_set (G_OBJECT (src), "do-timestamp", TRUE, NULL);
g_object_set (G_OBJECT (src), "num-buffers", NUM_VIDEO_BUFFERS, NULL);
g_object_set (G_OBJECT (osel), "resend-latest", TRUE, NULL);
/* handle deferred properties */
g_signal_connect (G_OBJECT (sink1), "element-added",
G_CALLBACK (on_bin_element_added), NULL);
g_signal_connect (G_OBJECT (sink2), "element-added",
G_CALLBACK (on_bin_element_added), NULL);
/* link src ! timeoverlay ! osel */
if (!gst_element_link_many (src, c0, toverlay, osel, NULL)) {
g_print ("linking failed\n");
return -1;
}
/* link output 1 */
sinkpad = gst_element_get_static_pad (c1, "sink");
osel_src1 = gst_element_request_pad_simple (osel, "src_%u");
if (gst_pad_link (osel_src1, sinkpad) != GST_PAD_LINK_OK) {
g_print ("linking output 1 converter failed\n");
return -1;
}
gst_object_unref (sinkpad);
if (!gst_element_link (c1, sink1)) {
g_print ("linking output 1 failed\n");
return -1;
}
/* link output 2 */
sinkpad = gst_element_get_static_pad (c2, "sink");
osel_src2 = gst_element_request_pad_simple (osel, "src_%u");
if (gst_pad_link (osel_src2, sinkpad) != GST_PAD_LINK_OK) {
g_print ("linking output 2 converter failed\n");
return -1;
}
gst_object_unref (sinkpad);
if (!gst_element_link (c2, sink2)) {
g_print ("linking output 2 failed\n");
return -1;
}
/* add switch callback */
g_timeout_add_seconds (SWITCH_TIMEOUT, switch_cb, osel);
/* change to playing */
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_add_watch (bus, my_bus_callback, loop);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* now run */
g_main_loop_run (loop);
/* also clean up */
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_element_release_request_pad (osel, osel_src1);
gst_element_release_request_pad (osel, osel_src2);
gst_object_unref (GST_OBJECT (pipeline));
return 0;
}
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