3 #define SWITCH_TIMEOUT 1000
4 #define NUM_VIDEO_BUFFERS 500
6 static GMainLoop *loop;
8 /* Output selector src pads */
9 static GstPad *osel_src1 = NULL;
10 static GstPad *osel_src2 = NULL;
13 my_bus_callback (GstBus * bus, GstMessage * message, gpointer data)
15 g_print ("Got %s message\n", GST_MESSAGE_TYPE_NAME (message));
17 switch (GST_MESSAGE_TYPE (message)) {
18 case GST_MESSAGE_ERROR:{
22 gst_message_parse_error (message, &err, &debug);
23 g_print ("Error: %s\n", err->message);
27 g_main_loop_quit (loop);
32 g_main_loop_quit (loop);
35 /* unhandled message */
38 /* we want to be notified again the next time there is a message
39 * on the bus, so returning TRUE (FALSE means we want to stop watching
40 * for messages on the bus and our callback should not be called again)
46 switch_cb (gpointer user_data)
48 GstElement *sel = GST_ELEMENT (user_data);
49 GstPad *old_pad, *new_pad = NULL;
51 g_object_get (G_OBJECT (sel), "active-pad", &old_pad, NULL);
53 if (old_pad == osel_src1)
58 g_object_set (G_OBJECT (sel), "active-pad", new_pad, NULL);
60 g_print ("switched from %s:%s to %s:%s\n", GST_DEBUG_PAD_NAME (old_pad),
61 GST_DEBUG_PAD_NAME (new_pad));
63 gst_object_unref (old_pad);
70 on_bin_element_added (GstBin * bin, GstElement * element, gpointer user_data)
72 g_object_set (G_OBJECT (element), "sync", FALSE, "async", FALSE, NULL);
76 main (gint argc, gchar * argv[])
78 GstElement *pipeline, *src, *toverlay, *osel, *sink1, *sink2, *c1, *c2, *c0;
83 gst_init (&argc, &argv);
84 loop = g_main_loop_new (NULL, FALSE);
87 pipeline = gst_element_factory_make ("pipeline", "pipeline");
88 src = gst_element_factory_make ("videotestsrc", "src");
89 c0 = gst_element_factory_make ("ffmpegcolorspace", NULL);
90 toverlay = gst_element_factory_make ("timeoverlay", "timeoverlay");
91 osel = gst_element_factory_make ("output-selector", "osel");
92 c1 = gst_element_factory_make ("ffmpegcolorspace", NULL);
93 c2 = gst_element_factory_make ("ffmpegcolorspace", NULL);
94 sink1 = gst_element_factory_make ("autovideosink", "sink1");
95 sink2 = gst_element_factory_make ("autovideosink", "sink2");
97 if (!pipeline || !src || !c0 || !toverlay || !osel || !c1 || !c2 || !sink1 ||
99 g_print ("missing element\n");
103 /* add them to bin */
104 gst_bin_add_many (GST_BIN (pipeline), src, c0, toverlay, osel, c1, sink1, c2,
108 g_object_set (G_OBJECT (src), "is-live", TRUE, NULL);
109 g_object_set (G_OBJECT (src), "do-timestamp", TRUE, NULL);
110 g_object_set (G_OBJECT (src), "num-buffers", NUM_VIDEO_BUFFERS, NULL);
111 g_object_set (G_OBJECT (osel), "resend-latest", TRUE, NULL);
113 /* handle deferred properties */
114 g_signal_connect (G_OBJECT (sink1), "element-added",
115 G_CALLBACK (on_bin_element_added), NULL);
116 g_signal_connect (G_OBJECT (sink2), "element-added",
117 G_CALLBACK (on_bin_element_added), NULL);
119 /* link src ! timeoverlay ! osel */
120 if (!gst_element_link_many (src, c0, toverlay, osel, NULL)) {
121 g_print ("linking failed\n");
126 sinkpad = gst_element_get_static_pad (c1, "sink");
127 osel_src1 = gst_element_get_request_pad (osel, "src%d");
128 if (gst_pad_link (osel_src1, sinkpad) != GST_PAD_LINK_OK) {
129 g_print ("linking output 1 converter failed\n");
132 gst_object_unref (sinkpad);
134 if (!gst_element_link (c1, sink1)) {
135 g_print ("linking output 1 failed\n");
140 sinkpad = gst_element_get_static_pad (c2, "sink");
141 osel_src2 = gst_element_get_request_pad (osel, "src%d");
142 if (gst_pad_link (osel_src2, sinkpad) != GST_PAD_LINK_OK) {
143 g_print ("linking output 2 converter failed\n");
146 gst_object_unref (sinkpad);
148 if (!gst_element_link (c2, sink2)) {
149 g_print ("linking output 2 failed\n");
153 /* add switch callback */
154 g_timeout_add (SWITCH_TIMEOUT, switch_cb, osel);
156 /* change to playing */
157 bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
158 gst_bus_add_watch (bus, my_bus_callback, loop);
159 gst_object_unref (bus);
161 gst_element_set_state (pipeline, GST_STATE_PLAYING);
164 g_main_loop_run (loop);
167 gst_element_set_state (pipeline, GST_STATE_NULL);
168 gst_element_release_request_pad (osel, osel_src1);
169 gst_element_release_request_pad (osel, osel_src2);
170 gst_object_unref (GST_OBJECT (pipeline));