[gst-devel] Need help on using decodebin as media decoder
Fariq Izwan
fizwan at gmail.com
Thu Apr 22 11:42:48 CEST 2010
Thank you very much. It works now. :)
Here is what I did:
static void
cb_newpad (GstElement *decodebin,
GstPad *pad,
gboolean last,
gpointer data)
{
GstCaps *caps;
GstStructure *str;
GstPad *audiopad,*videopad;
gchar *tex;
/* check media type */
caps = gst_pad_get_caps (pad);
str = gst_caps_get_structure (caps, 0);
tex = gst_structure_get_name(str);
if(g_strrstr(tex,"audio"))
{
audiopad = gst_element_get_static_pad (audio, "sink");
if(GST_PAD_IS_LINKED(audiopad))
{
g_object_unref(audiopad);
return;
}
else
{
gst_pad_link(pad,audiopad);
g_object_unref(audiopad);
}
return;
}
Fariq.
> Message: 6
> Date: Thu, 22 Apr 2010 10:22:39 +0300
> From: Stefan Kost <ensonic at hora-obscura.de>
> Subject: Re: [gst-devel] Need help on using decodebin as media decoder
> To: Discussion of the development of GStreamer
> <gstreamer-devel at lists.sourceforge.net>
> Message-ID: <4BCFF93F.3020109 at hora-obscura.de>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Fariq Izwan wrote:
> > Hi good people,
> >
> > I'm new to gstreamer and I have a problem of using decodebin as a
> > decoder to play video file. Below is my sample code that I use. The
> > code below runs fine for one stream of media. But if I want to play
> > both streams(audio and video), it doesn't work.
> > Can anyone tell me what I did wrong here? (Please don't suggest to use
> > playbin) :)
> >
> > Thank you.
> >
> > Fariq.
> >
> > ####Sample code####
> >
> > #include <gst/gst.h>
> > #include <glib-2.0/glib/gprintf.h>
> > #include <gstreamer-0.10/gst/gstelement.h>
> > #include <glib-2.0/glib/gmessages.h>
> >
> > GstElement *pipeline, *audio,*video,*audioqueue,*videoqueue;
> >
> > static void
> > cb_newpad (GstElement *decodebin,
> > GstPad *pad,
> > gboolean last,
> > gpointer data)
> > {
> > GstPad *audiopad,*videopad;
> >
> > /* link audiopad */
> > audiopad = gst_element_get_static_pad (audio, "sink");
> > if (!GST_PAD_IS_LINKED (audiopad)) {
> > gst_pad_link (pad, audiopad);
> > g_print("audiopad has been linked");
> > g_object_unref (audiopad);
> > return;
> > }
> this is not correct. You would need to check the media-type of the caps
> on the provided pad. (Get the caps from the pad, the structure from the
> caps and check the name of the structure (audio/video/something-else).
> Depending on that you link the audio- or videobin.
> Also in the above code, you leak the audiopad, if it is linked already.
> The above code might work, if you check the result of gst_pad_link() and
> only return if that worked, otherwise you continie and try the next pad.
>
> Stefan
>
> > /* link videopad */
> > videopad = gst_element_get_static_pad(video,"sink");
> > if (!GST_PAD_IS_LINKED (videopad)) {
> > gst_pad_link(pad,videopad);
> > gst_element_link(videoqueue,video);
> > g_object_unref (videopad);
> > return;
> > }
> > }
> >
> > gint
> > main (gint argc,
> > gchar *argv[])
> > {
> > GMainLoop *loop;
> > GstElement *src, *dec, *conv, *sink, *typefind,*typefind2;//*myplugin;
> > GstElement *convVid,*videosink;
> > GstPad *audiopad,*videopad;
> > GstBus *bus;
> >
> > /* init GStreamer */
> > gst_init (&argc, &argv);
> > loop = g_main_loop_new (NULL, FALSE);
> >
> > /* make sure we have input */
> > if (argc != 2) {
> > g_print ("Usage: %s <filename>\n", argv[0]);
> > return -1;
> > }
> >
> > g_print("Playing %s \n",argv[1]);
> >
> > /* setup */
> > pipeline = gst_pipeline_new ("pipeline");
> >
> > bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
> > gst_bus_add_watch (bus, my_bus_callback, loop);
> > gst_object_unref (bus);
> >
> > src = gst_element_factory_make ("filesrc", "source");
> > g_object_set (G_OBJECT (src), "location", argv[1], NULL);
> > typefind = gst_element_factory_make("typefind","typefinder");
> > g_signal_connect(typefind,"have-type",G_CALLBACK(typefound_cb),loop);
> > dec = gst_element_factory_make ("decodebin", "decoder");
> > g_signal_connect (dec, "new-decoded-pad", G_CALLBACK (cb_newpad),
> NULL);
> > //myplugin = gst_element_factory_make("myplugin","MyPlugin");
> > audioqueue = gst_element_factory_make("queue","audioqueue");
> > videoqueue = gst_element_factory_make("queue","videoqueue");
> > gst_bin_add_many (GST_BIN (pipeline), src,typefind,dec,NULL);
> > gst_element_link_many (src,typefind,dec,NULL);
> >
> > /* create audio output */
> > audio = gst_bin_new ("audiobin");
> > conv = gst_element_factory_make ("audioconvert", "aconv");
> > typefind2 = gst_element_factory_make("typefind","typefinder2");
> >
> //g_signal_connect(typefind2,"have-type",G_CALLBACK(typefound_cb),loop);
> > audiopad = gst_element_get_static_pad (audioqueue, "sink");
> > sink = gst_element_factory_make ("osssink", "sink");
> > gst_bin_add_many (GST_BIN (audio),audioqueue,conv,typefind2, sink,
> > NULL);
> > gst_element_link_many (audioqueue,conv,typefind2, sink,NULL);
> > gst_element_add_pad (audio,
> > gst_ghost_pad_new ("sink", audiopad));
> > gst_object_unref (audiopad);
> > gst_bin_add (GST_BIN (pipeline), audio);
> >
> > /* create video output */
> > video = gst_bin_new("videobin");
> > convVid = gst_element_factory_make("ffmpegcolorspace","converter");
> > videopad = gst_element_get_static_pad(videoqueue,"sink");
> > videosink = gst_element_factory_make("xvimagesink","videosink");
> > gst_bin_add_many(GST_BIN(video),videoqueue,convVid,videosink,NULL);
> > gst_element_link_many(videoqueue,convVid,videosink,NULL);
> > gst_element_add_pad(video,gst_ghost_pad_new("sink",videopad));
> > gst_object_unref(videopad);
> > gst_bin_add(GST_BIN(pipeline),video);
> >
> > /* run */
> > gst_element_set_state (pipeline, GST_STATE_PLAYING);
> > g_timeout_add (200, (GSourceFunc) cb_print_position, pipeline);
> > g_main_loop_run (loop);
> >
> > /* cleanup */
> > gst_element_set_state (pipeline, GST_STATE_NULL);
> > gst_object_unref (GST_OBJECT (pipeline));
> >
> > return 0;
> > }
> > ------------------------------------------------------------------------
> >
> >
> ------------------------------------------------------------------------------
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
> >
>
>
>
>
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> End of gstreamer-devel Digest, Vol 47, Issue 59
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