AW: GStreamer C Code to play video

[Steve]

>So far I've been only working in Perl, so this is my first excursion into
>Perl.

Whoops, typo:

so this is my first excursion into C++.


-----Original Message-----
From: gstreamer-devel-bounces+it=sca-uk.com at lists.freedesktop.org
[mailto:gstreamer-devel-bounces+it=sca-uk.com at lists.freedesktop.org] On
Behalf Of Steve
Sent: 04 August 2011 08:19
To: 'Discussion of the development of and with GStreamer'
Subject: RE: AW: GStreamer C Code to play video

Thanks Durga,

Sorry to sound so dim, but do you have a script to compile and link it,
please?

So far I've been only working in Perl, so this is my first excursion into
Perl.

Thanks in advance.

Steve 

-----Original Message-----
From: gstreamer-devel-bounces+it=sca-uk.com at lists.freedesktop.org
[mailto:gstreamer-devel-bounces+it=sca-uk.com at lists.freedesktop.org] On
Behalf Of Durga
Sent: 04 August 2011 06:30
To: gstreamer-devel at lists.freedesktop.org
Subject: RE: AW: GStreamer C Code to play video

Steve, 

This is the working code!

#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 *pipeline, *source, *demuxer, *decoder, *conv, *sink;
GstBus *bus;
/* Initialisation */
gst_init (&argc, &argv);
loop = g_main_loop_new (NULL, FALSE);
/* Check input arguments */
if (argc != 2) {
g_printerr ("Usage: %s &lt;Ogg/Vorbis filename&gt;\n", argv[0]);
return -1;
}
/* Create gstreamer elements */
pipeline = gst_pipeline_new ("audio-player");
source = gst_element_factory_make ("filesrc", "file-source");
demuxer = gst_element_factory_make ("qtdemux", "demuxer");
decoder = gst_element_factory_make ("ffdec_mpeg4", "decoder");
sink = gst_element_factory_make ("autovideosink", "video-output");
if (!pipeline || !source || !demuxer || !decoder || !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));
gst_bus_add_watch (bus, bus_call, loop);
gst_object_unref (bus);
/* we add all elements into the pipeline */
gst_bin_add_many (GST_BIN (pipeline),
source, demuxer, decoder, sink, NULL);
/* we link the elements together */
gst_element_link (source, demuxer);
gst_element_link_many (decoder, sink, NULL);
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));
return 0;
}

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