--- /dev/null
+/* GStreamer
+ *
+ * addstream.c: sample application to dynamically add streams to a running
+ * pipeline
+ *
+ * Copyright (C) <2007> Wim Taymans <wim dot taymans at gmail dot com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <unistd.h>
+
+#include <gst/gst.h>
+
+static GstElement *pipeline;
+static GstClock *theclock;
+static GMainLoop *loop;
+static GstElement *bin1, *bin2, *bin3, *bin4, *bin5;
+
+/* start a bin with the given description */
+static GstElement *
+create_stream (const gchar * descr)
+{
+ GstElement *bin;
+ GError *error = NULL;
+
+ bin = gst_parse_launch (descr, &error);
+ if (error) {
+ g_print ("pipeline could not be constructed: %s\n", error->message);
+ g_error_free (error);
+ return NULL;
+ }
+
+ /* add the bin to the pipeline now, this will set the current base_time of the
+ * pipeline on the new bin. */
+ gst_bin_add (GST_BIN_CAST (pipeline), bin);
+
+ return bin;
+}
+
+static gboolean
+pause_play_stream (GstElement * bin, gint seconds)
+{
+ gboolean punch_in;
+ GstStateChangeReturn ret;
+ GstClockTime now, base_time, running_time;
+
+ /* get current running time, we need this value to continue playback of
+ * non-live pipelines. */
+ now = gst_clock_get_time (theclock);
+ base_time = gst_element_get_base_time (bin);
+
+ running_time = now - base_time;
+
+ /* set the new bin to PAUSED, the parent bin will notice (because of the ASYNC
+ * message and will perform latency calculations again when going to PLAYING
+ * later. */
+ ret = gst_element_set_state (bin, GST_STATE_PAUSED);
+
+ switch (ret) {
+ case GST_STATE_CHANGE_NO_PREROLL:
+ /* live source, timestamps are running_time of the pipeline clock. */
+ punch_in = FALSE;
+ break;
+ case GST_STATE_CHANGE_SUCCESS:
+ /* success, no async state changes, same as async, timestamps start
+ * from 0 */
+ case GST_STATE_CHANGE_ASYNC:
+ /* no live source, bin will preroll. We have to punch it in because in
+ * this situation timestamps start from 0. */
+ punch_in = TRUE;
+ break;
+ default:
+ case GST_STATE_CHANGE_FAILURE:
+ return FALSE;
+ }
+
+ if (seconds)
+ sleep (seconds);
+
+ if (punch_in) {
+ /* new bin has to be aligned with previous running_time. We do this by taking
+ * the current absolute clock time and calculating the base time that would
+ * give the previous running_time. We set this base_time on the bin before
+ * setting it to PLAYING. */
+ now = gst_clock_get_time (theclock);
+ base_time = now - running_time;
+
+ gst_element_set_base_time (bin, base_time);
+ }
+
+ /* now set the pipeline to PLAYING */
+ gst_element_set_state (bin, GST_STATE_PLAYING);
+
+ return TRUE;
+}
+
+static void
+message_received (GstBus * bus, GstMessage * message, GstPipeline * pipeline)
+{
+ const GstStructure *s;
+
+ s = gst_message_get_structure (message);
+ g_print ("message from \"%s\" (%s): ",
+ GST_STR_NULL (GST_ELEMENT_NAME (GST_MESSAGE_SRC (message))),
+ gst_message_type_get_name (GST_MESSAGE_TYPE (message)));
+ if (s) {
+ gchar *sstr;
+
+ sstr = gst_structure_to_string (s);
+ g_print ("%s\n", sstr);
+ g_free (sstr);
+ } else {
+ g_print ("no message details\n");
+ }
+}
+
+static void
+eos_message_received (GstBus * bus, GstMessage * message,
+ GstPipeline * pipeline)
+{
+ message_received (bus, message, pipeline);
+ g_main_loop_quit (loop);
+}
+
+static gboolean
+perform_step (gpointer pstep)
+{
+ gint step = GPOINTER_TO_INT (pstep);
+
+ switch (step) {
+ case 0:
+ /* live stream locks on to running_time, pipeline configures latency. */
+ g_print ("creating bin1\n");
+ bin1 =
+ create_stream
+ ("( v4l2src ! ffmpegcolorspace ! timeoverlay ! queue ! xvimagesink name=v4llive )");
+ pause_play_stream (bin1, 0);
+ g_timeout_add (1000, (GSourceFunc) perform_step, GINT_TO_POINTER (1));
+ break;
+ case 1:
+ /* live stream locks on to running_time, pipeline reconfigures latency
+ * together with the previously added bin so that they run synchronized. */
+ g_print ("creating bin2\n");
+ bin2 = create_stream ("( alsasrc ! queue ! alsasink name=alsalive )");
+ pause_play_stream (bin2, 0);
+ g_timeout_add (1000, (GSourceFunc) perform_step, GINT_TO_POINTER (2));
+ break;
+ case 2:
+ /* non-live stream, need base_time to align with current running live sources. */
+ g_print ("creating bin3\n");
+ bin3 = create_stream ("( audiotestsrc ! alsasink name=atnonlive )");
+ pause_play_stream (bin3, 0);
+ g_timeout_add (1000, (GSourceFunc) perform_step, GINT_TO_POINTER (3));
+ break;
+ case 3:
+ g_print ("creating bin4\n");
+ bin4 =
+ create_stream
+ ("( videotestsrc ! timeoverlay ! ffmpegcolorspace ! ximagesink name=vtnonlive )");
+ pause_play_stream (bin4, 0);
+ g_timeout_add (1000, (GSourceFunc) perform_step, GINT_TO_POINTER (4));
+ break;
+ case 4:
+ /* live stream locks on to running_time */
+ g_print ("creating bin5\n");
+ bin5 =
+ create_stream
+ ("( videotestsrc is-live=1 ! timeoverlay ! ffmpegcolorspace ! ximagesink name=vtlive )");
+ pause_play_stream (bin5, 0);
+ g_timeout_add (1000, (GSourceFunc) perform_step, GINT_TO_POINTER (5));
+ break;
+ case 5:
+ /* pause the fist live stream for 2 seconds */
+ g_print ("PAUSE bin1 for 2 seconds\n");
+ pause_play_stream (bin1, 2);
+ /* pause the non-live stream for 2 seconds */
+ g_print ("PAUSE bin4 for 2 seconds\n");
+ pause_play_stream (bin4, 2);
+ /* pause the pseudo live stream for 2 seconds */
+ g_print ("PAUSE bin5 for 2 seconds\n");
+ pause_play_stream (bin5, 2);
+ g_print ("Waiting 5 seconds\n");
+ g_timeout_add (5000, (GSourceFunc) perform_step, GINT_TO_POINTER (6));
+ break;
+ case 6:
+ g_print ("quiting\n");
+ g_main_loop_quit (loop);
+ break;
+ default:
+ break;
+ }
+ return FALSE;
+}
+
+int
+main (int argc, char *argv[])
+{
+ GstBus *bus;
+
+ gst_init (&argc, &argv);
+
+ loop = g_main_loop_new (NULL, TRUE);
+
+ pipeline = gst_pipeline_new ("pipeline");
+
+ /* setup message handling */
+ bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
+ gst_bus_add_signal_watch_full (bus, G_PRIORITY_HIGH);
+ g_signal_connect (bus, "message::error", (GCallback) message_received,
+ pipeline);
+ g_signal_connect (bus, "message::warning", (GCallback) message_received,
+ pipeline);
+ g_signal_connect (bus, "message::eos", (GCallback) eos_message_received,
+ pipeline);
+
+ /* we set the pipeline to PLAYING, this will distribute a default clock and
+ * start running. no preroll is needed */
+ gst_element_set_state (pipeline, GST_STATE_PLAYING);
+
+ /* get the clock now. Since we never set the pipeline to PAUSED again, the
+ * clock will not change, even when we add new clock providers later. */
+ theclock = gst_element_get_clock (pipeline);
+
+ /* start our actions while we are in the mainloop so that we can catch errors
+ * and other messages. */
+ g_idle_add ((GSourceFunc) perform_step, GINT_TO_POINTER (0)),
+ /* go to main loop */
+ g_main_loop_run (loop);
+
+ gst_element_set_state (pipeline, GST_STATE_NULL);
+
+ gst_object_unref (bus);
+ gst_object_unref (pipeline);
+ gst_object_unref (theclock);
+
+ return 0;
+}
projects / platform / upstream / gst-plugins-base.git / commitdiff