<html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <div class="moz-cite-prefix">On 17/12/2012 12:13, Tim-Philipp Müller wrote: </div> <blockquote cite="mid:1355746386.28237.4.camel@zingle" type="cite"> <pre wrap="">On Sat, 2012-12-15 at 14:47 +0000, Ian Davidson wrote: Hi, </pre> <blockquote type="cite"> <pre wrap="">I have compiled the helloWorld example from the GStreamer documentation and it worked. </pre> </blockquote> <pre wrap=""> (Our Hello World should really just be a playbin example..) </pre> </blockquote> I have modified my program and it gets a little further - but it still does not work. The program is based on the helloworld example, but I wanted to create two bins with the original pipeline split between the two bins - and then link the bins together. The program is below. When I try to run it, I get a message "Error: Internal data stream error." Question 1. I can see the line(s) which outputs the message, but I don't know what generates the message. I tried to use gst_message_src_name - but I did not get the usage right. I thought it would give me a string, but evidently not. I could not get it to compile. How can I print the source of the message? What line should I write? Question 2 I add source and demuxer into bin1. Then, later, I link source and demuxer. I am assuming that source and demuxer can only be in one place - and that therefore, it is the only copies that are being linked. Question 3 I suspect that I have not linked my Ghost Pads. How/where should I do that? Thanks Ian <div class="moz-text-html" lang="x-western"> <div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"> <div>#include <gst/gst.h> #include <glib.h> 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 *error; gst_message_parse_error (msg, &error, &debug); g_free (debug); g_printerr ("Error: %s\n", error->message); g_error_free (error); g_main_loop_quit (loop); break; } default: break; } return TRUE; } static void on_pad_added (GstElement *element, GstPad *pad, gpointer data) { GstPad *sinkpad; GstElement *decoder = (GstElement *) data; /* We can now link this pad with the vorbis-decoder sink pad */ g_print ("Dynamic pad created, linking demuxer/decoder\n"); sinkpad = gst_element_get_static_pad (decoder, "sink"); gst_pad_link (pad, sinkpad); gst_object_unref (sinkpad); } int main (int argc, char *argv[]) { GMainLoop *loop; GstElement *bin1, *bin2, *pipeline, *pipeline1, *pipeline2, *source, *demuxer, *decoder, *conv, *sink, *ghostsrc, *ghostsink; GstBus *bus; GstPad *pad1, *pad2; guint bus_watch_id; /* Initialisation */ gst_init (&argc, &argv); loop = g_main_loop_new (NULL, FALSE); /* Check input arguments */ if (argc != 2) { g_printerr ("Usage: %s <Ogg/Vorbis filename>\n", argv[0]); return -1; } /* Create gstreamer elements */ pipeline = gst_pipeline_new ("audio-player"); pipeline1 = gst_pipeline_new ("pipe1"); pipeline2 = gst_pipeline_new ("pipe2"); bin1 = gst_bin_new ("bin1"); bin2 = gst_bin_new ("bin2"); source = gst_element_factory_make ("filesrc", "file-source"); demuxer = gst_element_factory_make ("oggdemux", "ogg-demuxer"); decoder = gst_element_factory_make ("vorbisdec", "vorbis-decoder"); conv = gst_element_factory_make ("audioconvert", "converter"); sink = gst_element_factory_make ("autoaudiosink", "audio-output"); ghostsrc = gst_element_factory_make ("fakesrc", "ghostsrc"); ghostsink =gst_element_factory_make ("fakesink", "ghostsink"); if (!pipeline || !pipeline1 || !pipeline2 || !bin1 || !bin2 || !source || !demuxer || !decoder || !conv || !sink) { g_printerr ("One element could not be created. Exiting.\n"); return -1; } /* Set up the pipeline */ /* we set the input filename to the source element */ g_object_set (G_OBJECT (source), "location", argv[1], NULL); /* we add a message handler */ bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline)); bus_watch_id = gst_bus_add_watch (bus, bus_call, loop); gst_object_unref (bus); /* we add all elements into the pipeline */ /* file-source | ogg-demuxer | vorbis-decoder | converter | alsa-output */ g_print ("Step 1...\n"); gst_bin_add_many (GST_BIN (bin1), source, demuxer, decoder, ghostsrc, NULL); g_print ("Step 2...\n"); pad1 = gst_element_get_static_pad (ghostsrc, "src"); g_print ("Step 2a...\n"); gst_element_add_pad (bin1, gst_ghost_pad_new ("ghostsrc", pad1)); g_print ("Step 2b...\n"); gst_object_unref (GST_OBJECT (pad1)); g_print ("Step 3...\n"); gst_bin_add_many (GST_BIN (bin2), ghostsink, conv, sink, NULL); g_print ("Step 4...\n"); pad2 = gst_element_get_static_pad (ghostsink, "sink"); g_print ("Step 4a...\n"); gst_element_add_pad (bin2, gst_ghost_pad_new ("ghostsink", pad2)); g_print ("Step 4b...\n"); gst_object_unref (GST_OBJECT (pad2)); g_print ("Step 5...\n"); gst_bin_add_many (GST_BIN (pipeline), bin1, bin2, NULL); /* we link the elements together */ /* file-source -> ogg-demuxer ~> vorbis-decoder -> converter -> alsa-output */ g_print ("Step 6...\n"); gst_element_link (source, demuxer); g_print ("Step 7...\n"); gst_element_link_many (conv, sink, NULL); g_print ("Step 8...\n"); gst_element_link (bin1, bin2); g_print ("Step 9...\n"); g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added), decoder); /* note that the demuxer will be linked to the decoder dynamically. The reason is that Ogg may contain various streams (for example audio and video). The source pad(s) will be created at run time, by the demuxer when it detects the amount and nature of streams. Therefore we connect a callback function which will be executed when the "pad-added" is emitted.*/ /* Set the pipeline to "playing" state*/ g_print ("Now playing: %s\n", argv[1]); gst_element_set_state (pipeline, GST_STATE_PLAYING); /* Iterate */ g_print ("Running...\n"); g_main_loop_run (loop); /* Out of the main loop, clean up nicely */ g_print ("Returned, stopping playback\n"); gst_element_set_state (pipeline, GST_STATE_NULL); g_print ("Deleting pipeline\n"); gst_object_unref (GST_OBJECT (pipeline)); g_source_remove (bus_watch_id); g_main_loop_unref (loop); return 0; } </div> </div> </div> <div class="moz-signature">-- -- Ian Davidson -- Facts used in this message may or may not reflect an underlying objective reality. Facts are supplied for personal use only. Recipients quoting supplied information do so at their own risk. Facts supplied may vary in whole or part from widely accepted standards. While painstakingly researched, facts may or may not be indicative of actually occurring events or natural phenomena. The author accepts no responsibility for personal loss or injury resulting from memorisation and subsequent use. </div> </body> </html>