tests/examples/dynamic/addstream.c - imx-gst-plugins-base - Git at Google

 /* 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., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #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 void
 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;
     case GST_STATE_CHANGE_FAILURE:
       /* fall through to return */
     default:
       return;
   }

   if (seconds)
     g_usleep (seconds * G_USEC_PER_SEC);

   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);
 }

 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 ! videoconvert ! timeoverlay ! queue ! xvimagesink name=v4llive )");
       pause_play_stream (bin1, 0);
       g_timeout_add_seconds (1, (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_seconds (1, (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_seconds (1, (GSourceFunc) perform_step,
           GINT_TO_POINTER (3));
       break;
     case 3:
       g_print ("creating bin4\n");
       bin4 =
           create_stream
           ("( videotestsrc ! timeoverlay ! videoconvert ! ximagesink name=vtnonlive )");
       pause_play_stream (bin4, 0);
       g_timeout_add_seconds (1, (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 ! videoconvert ! ximagesink name=vtlive )");
       pause_play_stream (bin5, 0);
       g_timeout_add_seconds (1, (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_seconds (5, (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;
 }
	/* 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., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#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 void
	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;
	case GST_STATE_CHANGE_FAILURE:
	/* fall through to return */
	default:
	return;
	}

	if (seconds)
	g_usleep (seconds * G_USEC_PER_SEC);

	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);
	}

	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 ! videoconvert ! timeoverlay ! queue ! xvimagesink name=v4llive )");
	pause_play_stream (bin1, 0);
	g_timeout_add_seconds (1, (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_seconds (1, (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_seconds (1, (GSourceFunc) perform_step,
	GINT_TO_POINTER (3));
	break;
	case 3:
	g_print ("creating bin4\n");
	bin4 =
	create_stream
	("( videotestsrc ! timeoverlay ! videoconvert ! ximagesink name=vtnonlive )");
	pause_play_stream (bin4, 0);
	g_timeout_add_seconds (1, (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 ! videoconvert ! ximagesink name=vtlive )");
	pause_play_stream (bin5, 0);
	g_timeout_add_seconds (1, (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_seconds (5, (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;
	}