AW: Re: dvbbasebin and tcpserversink
Bernhard Graaf
bernhard.graaf at gmx.de
Mon Apr 11 23:18:23 PDT 2011
Is there anybody, who can help me?
-----Ursprüngliche Nachricht-----
Von: gstreamer-devel-bounces+bernhard.graaf=gmx.de at lists.freedesktop.org
[mailto:gstreamer-devel-bounces+bernhard.graaf=gmx.de at lists.freedesktop.org]
Im Auftrag von Bernhard Graaf
Gesendet: Freitag, 8. April 2011 11:32
An: bernhard.graaf at gmx.de; 'Discussion of the development of and with
GStreamer'
Betreff: AW: Re: dvbbasebin and tcpserversink
Hi Zaheer,
Sorry for late answering!
I tried to understand your proposal, but I don't understand that.
I take a lock with the gst-inspect command at dvbbasebin, but I couldn't see
anything about the pad (pad: none).
But I had tried to follow the docs. That's my code, but it doesn't work
(that the problem if I should do something without any understanding):
----------------------
#include <stdio.h>
#include <unistd.h>
#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 *sourcepad;
GstElement *source = (GstElement *) data;
gchar *name;
name = gst_pad_get_name (pad);
g_print ("A new pad %s was created\n", name);
g_free (name);
sourcepad = gst_element_get_static_pad (source, "program_17501");
gst_pad_link (pad, sourcepad);
gst_object_unref (sourcepad);
}
int
main ()
{
GMainLoop *loop;
GstElement *pipeline, *source, *sink;
GstBus *bus;
gst_init (0, NULL);
loop = g_main_loop_new (NULL, FALSE);
pipeline = gst_pipeline_new ("DVB-Streamer");
source = gst_element_factory_make ("dvbbasebin", "dvb-source");
sink = gst_element_factory_make ("tcpserversink", "tcp-output");
if (!pipeline || !source || !sink) {
g_printerr ("One element could not be created. Exiting.\n");
if(!pipeline) g_printerr("Pipeline not created\n");
else if(!source) g_printerr("Source not created\n");
else if(!sink) g_printerr("Sink not created\n");
return -1;
}
g_object_set (G_OBJECT (source), "adapter", 1, NULL);
g_object_set (G_OBJECT (source), "frequency", 12544000, NULL);
g_object_set (G_OBJECT (source), "program-numbers", "17501", NULL);
g_object_set (G_OBJECT (source), "polarity", "h", NULL);
g_object_set (G_OBJECT (source), "symbol-rate", 22000, NULL);
g_object_set (G_OBJECT (sink), "port", 8080, NULL);
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
gst_bus_add_watch (bus, bus_call, loop);
gst_object_unref (bus);
gst_bin_add_many (GST_BIN (pipeline),
source, sink, NULL);
gst_element_link (source, sink);
gst_element_link_pads (source, "src", sink, "sink");
g_signal_connect (source, "program_17501", G_CALLBACK (on_pad_added),
source);
g_print ("Now playing: ");
gst_element_set_state (pipeline, GST_STATE_PLAYING);
g_print ("Running...\n");
g_main_loop_run (loop);
return 0;
}
---------------------
(Sorry for that big mail)
Hop you can help me!!!!!!
Regards
Bernhard
-----Ursprüngliche Nachricht-----
Von: gstreamer-devel-bounces+bernhard.graaf=gmx.de at lists.freedesktop.org
[mailto:gstreamer-devel-bounces+bernhard.graaf=gmx.de at lists.freedesktop.org]
Im Auftrag von Bernhard Graaf
Gesendet: Dienstag, 22. Februar 2011 14:43
An: Discussion of the development of and with GStreamer
Betreff: AW: Re: dvbbasebin and tcpserversink
Hi Zaheer,
Thats sounds good!
I will try it this evening and replay it to you
Thanks a Lot for help!
Gesendet mit BlackBerry von Vodafone
-----Original Message-----
From: Zaheer Merali <zaheerabbas at merali.org>
Sender: gstreamer-devel-bounces+bernhard.graaf=gmx.de at lists.freedesktop.org
Date: Tue, 22 Feb 2011 13:35:08
To: Discussion of the development of and with
GStreamer<gstreamer-devel at lists.freedesktop.org>
Reply-To: Discussion of the development of and with GStreamer
<gstreamer-devel at lists.freedesktop.org>
Cc: Bernhard Graaf<bernhard.graaf at gmx.de>
Subject: Re: dvbbasebin and tcpserversink
On Fri, Feb 18, 2011 at 12:22 PM, Bernhard Graaf <bernhard.graaf at gmx.de>
wrote:
> Hi,
>
> I'm a new gstreamer developer and have a small problem with a simple pipe.
> If I'm use the pipe:
> "gst-launch-0.10 -m dvbbasebin adapter=1 frequency=12544000
> program-numbers=17501 polarity=h symbol-rate=22000 ! tcpserversink
> port=8080"
>
> Then I can see the program (for e.g. with vlc tcp://192.168.1.102:8080)
>
> If I try to do the same in C-code
> --------
> int
> main ()
> {
> GMainLoop *loop;
>
> GstElement *pipeline, *source, *sink;
> GstBus *bus;
>
> gst_init (NULL, NULL);
>
> loop = g_main_loop_new (NULL, FALSE);
>
> pipeline = gst_pipeline_new ("DVB-Streamer");
> source = gst_element_factory_make ("dvbbasebin", "dvb-source");
> sink = gst_element_factory_make ("tcpserversink", "tcp-output");
>
> if (!pipeline || !source || !sink) {
> g_printerr ("One element could not be created. Exiting.\n");
> if(!pipeline) g_printerr("Pipeline not created\n");
> else if(!source) g_printerr("Source not created\n");
> else if(!sink) g_printerr("Sink not created\n");
> return -1;
> }
>
> g_object_set (G_OBJECT (source), "adapter", 1, NULL);
> g_object_set (G_OBJECT (source), "frequency", 12544000, NULL);
> g_object_set (G_OBJECT (source), "program-numbers", "17501", NULL);
> g_object_set (G_OBJECT (source), "polarity", "h", NULL);
> g_object_set (G_OBJECT (source), "symbol-rate", 22000, NULL);
> g_object_set (G_OBJECT (sink), "port", 8080, NULL);
>
> bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
> gst_bus_add_watch (bus, bus_call, loop);
> gst_object_unref (bus);
>
> gst_bin_add_many (GST_BIN (pipeline),
> source, sink, NULL);
>
> gst_element_link (source, sink);
>
> g_print ("Now playing: ");
> gst_element_set_state (pipeline, GST_STATE_PLAYING);
>
> g_print ("Running...\n");
> g_main_loop_run (loop);
>
> return 0;
> }
>
> ----
>
> I got the error:
>
> Now playing: Running...
> Error: Interner Fehler im Datenfluss.
> (sorry for the German error. it's call something like "Internal error in
> data stream")
>
> If I don't use the
>
> g_object_set (G_OBJECT (source), "program-numbers", "17501", NULL);
>
> It's running well, but I need this parameter
>
> Thanks a lot for helping!!
>
>
You need to connect to the sometimes pad generated by dvbbasebin. It
will be named program_17501
Read the chapter
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter
-pads.html
section 8.1.1 on how you connect to sometimes pads.
gst-launch does this work behind the scenes and that is why it works
in a gst-launch command line but not in your code.
Zaheer
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