using input-selector in custom pipeline

[Rohit Chawla]

Hi,
I am trying to use the input-selector element of gstreamer in my
custom pipeline to select the desired media (ogg) file to play.

the pipeline I was using is as below:

filesrc --> queue -
                 |  ----------
                 -->|         |
                    | I/P     |
                    | Selector|--> oggdemux --> theoradec -->
ffmpegcolorspace --> autovideosink
                 -->|         |
                 |  ----------
filesrc -> queue -

I tried to activate sinkpad1 of the input-selector element, but I am
getting following error:
Erplaybin2ror: Internal data flow error.

Please suugest the resolution.

Best Regards,
Rohit

================================
The source code I wrote is as below:


#include <gst/gst.h>
#include <string.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <ctype.h>

/* Global variables */
GstElement *pipeline,*source,*demuxer,*vid_decoder,*vid_convert,*vid_sink,*vid_queue;
GstElement *selector,*source1,*vid_queue1;
GMainLoop *loop;
GstBus *bus;

/* Call back function for the message signal over the bus */
static gboolean bus_call (GstBus * bus, GstMessage * msg, gpointer data)
{
 GMainLoop *loop = (GMainLoop *) data;

 switch (GST_MESSAGE_TYPE (msg)) {
   case GST_MESSAGE_EOS:{
     g_print ("End-of-stream\n");
     g_main_loop_quit (loop);
     break;
   }
   case GST_MESSAGE_ERROR:{
     gchar *debug;
     GError *err;

     gst_message_parse_error (msg, &err, &debug);
     g_free (debug);

     g_print ("Erplaybin2ror: %s\n", err->message);
     g_error_free (err);

     g_main_loop_quit
 (loop);
     break;
   }
   default:
     break;
 }
 return TRUE;
}

/* Callback function for the dynamic pad created */
static void on_pad_added(GstElement *element,GstPad *pad,gpointer a_data)
{
       GstPad *SinkPad;
       GstStructure *str;
       GstCaps *caps;
       caps = gst_pad_get_caps(pad);

       str = gst_caps_get_structure(caps,0);
       /* Audio demuxed pad created */
       if(g_strrstr(gst_structure_get_name(str),"audio"))
       {
#if 0
               g_print("Dynamic pad created,linking the demuxer and
audio decoder \n");
               SinkPad = gst_element_get_static_pad(aud_queue,"sink");
               if(gst_pad_link(pad,SinkPad))
               {
                       g_print("\n Cannot link the demuxer with the
audio decoder \n");
               }
               gst_object_unref(SinkPad);

               if(!gst_element_link_many(aud_queue,aud_decoder,aud_convert,aud_sink,NULL))
               {
                       g_print("Failed to link one or more element \n");
               }
#endif
       }
       else
       { /* Video Demuxed pad created */
               g_print("\n Dynamic pad created,linking the demuxer and
video decoder \n");

               //SinkPad = gst_element_get_static_pad(vid_queue,"sink");
               SinkPad = gst_element_get_static_pad(vid_decoder,"sink");
               if(gst_pad_link(pad,SinkPad))
               {
                       g_print("\n Cannot link the demuxer with the
video decoder \n");
               }
               gst_object_unref(SinkPad);

               if(!gst_element_link_many(/*vid_queue,*/vid_decoder,vid_convert,vid_sink,NULL))
               {
                       g_print("Failed to link one or more element \n");
               }
       }
}

/* Main */
gint main (gint argc, gchar * argv[])
{
       GstPad *sinkpad0, *sinkpad1, *srcpad0, *srcpad1;

       gst_init (&argc, &argv);

       if (argc < 3)
       {
               g_print ("usage: %s <media file or uri> <media file or
uri>\n", argv[0]);
               return 1;
       }

       /* Get all the elements */
       pipeline = gst_pipeline_new("ogg_player");
       source = gst_element_factory_make("filesrc","file-source");
       demuxer = gst_element_factory_make("oggdemux","ogg-demux");
       vid_decoder = gst_element_factory_make("theoradec","theora-decoder");
       vid_convert =
gst_element_factory_make("ffmpegcolorspace","colorspaceconverter");
       vid_sink = gst_element_factory_make("autovideosink","video-output");
       vid_queue = gst_element_factory_make("queue","video-output-queue");

       if (!pipeline || !source || !demuxer || !vid_decoder || !vid_convert
|| !vid_sink || !vid_queue)
       {
               g_print("\n One or more element is not created \n");
       }
       g_object_set (G_OBJECT (source), "location", argv[1], NULL);

   selector = gst_element_factory_make("input-selector","inputselector");
       source1 = gst_element_factory_make("filesrc","file-source-1");
       vid_queue1 = gst_element_factory_make("queue","video-output-queue-1");

       if (!selector || !source1 || !vid_queue1)
       {
               g_print("\n One or more element is not created \n");
       }
       g_object_set (G_OBJECT (source1), "location", argv[2], NULL);

       /* create and event loop and feed gstreamer bus mesages to it */
       loop = g_main_loop_new (NULL, FALSE);

       bus = gst_pipeline_get_bus (GST_PIPELINE(pipeline));

       gst_bus_add_watch (bus, bus_call, loop);

       g_object_unref (bus);

       /* Add the elements into the pipeline */
       gst_bin_add_many (GST_BIN(pipeline), source, demuxer, vid_decoder,
vid_convert, vid_sink, vid_queue, NULL);
       gst_bin_add_many (GST_BIN(pipeline), source1, selector,
vid_queue1, NULL);

       gst_element_link (source, vid_queue);
       gst_element_link (source1, vid_queue1);

       srcpad0 = gst_element_get_static_pad (vid_queue, "src");
       srcpad1 = gst_element_get_static_pad (vid_queue1, "src");

       sinkpad0 = gst_element_get_request_pad (selector, "sink0");
       sinkpad1 = gst_element_get_request_pad (selector, "sink1");

       if (gst_pad_link (srcpad0, sinkpad0))
       {
               g_print("\n Cannot link the vid_queue with the selector \n");
       }

       if (gst_pad_link (srcpad1, sinkpad1))
       {
               g_print("\n Cannot link the vid_queue1 with the selector \n");
       }

       if (!gst_element_link (selector, demuxer))
   {
       g_print("\n Cannot link selector with the demuxer \n");
       return 0;
   }

   gst_element_set_state (selector, GST_STATE_PAUSED);

   g_object_set (G_OBJECT(selector), "active-pad", sinkpad0, NULL);
   g_print ("\n Back to main() outside of
gst_input_selector_set_property()\n");

   g_print("\n selector and demuxer are now connected \n");

       g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added), NULL);

       gst_element_set_state (pipeline, GST_STATE_PLAYING);

       g_main_loop_run (loop);

       gst_element_set_state (pipeline, GST_STATE_NULL);

       gst_object_unref (sinkpad0);
       gst_object_unref (sinkpad1);
       gst_object_unref (srcpad0);
       gst_object_unref (srcpad1);

       g_object_unref (pipeline);

       //g_object_unref (loop);

   return 0;
}
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