[gst-devel] source plugin blocked in PAUSE state

[Riccardo Corona]

I've wrote the vmethod create() and set the type as GST_TYPE_BASE_SRC, but
now gst-inspect give me this  error :

CRITICAL **: file E:\devel-cvs\src\gstreamer\gst\gstelementfactory.c: line
266: assertion `g_type_is_a (type, GST_TYPE_ELEMENT)'
 failed

2007/6/28, René Stadler <mail at renestadler.de>:
>
> Am Donnerstag, den 28.06.2007, 17:01 +0200 schrieb Riccardo Corona:
> > Hi,
> > thank's for the tips. When I told that I've started from
> > GstPluginTemplate I mean something like this:
> >
> > GST_BOILERPLATE (GstPluginTemplate, gst_plugin_template, GstBaseSrc,
> >     GST_TYPE_ELEMENT);
> >
> > Is it what did you mean?
> >
> That should be
>
> GST_BOILERPLATE (GstPluginTemplate, gst_plugin_template, GstBaseSrc,
> GST_TYPE_BASE_SRC);
>
> Have a look at the GstBaseSrc documentation and refer to the various
> existing code that uses it (gnomevfssrc, videotestsrc, etc.).
>
> What you had before as get_range function goes as the create vmethod of
> your BaseSrc derived element (after you fix the function to return the
> buffer as *buf = buffer and return GST_FLOW_OK).
> >
> > 2007/6/28, René Stadler <mail at renestadler.de>:
> >         Am Donnerstag, den 28.06.2007, 13:09 +0200 schrieb Riccardo
> >         Corona:
> >         > Hi,
> >         > I'm writing a source plugin, I'm started from
> >         GstPluginTemplate to
> >         > make a simple plugin that generate only B&W frames...
> >         > The problem is that with this pipeline:
> >         >
> >         I strongly suggest deriving from GstBaseSrc instead.
> >
> >
> >         > mysrc ! ffmpegcolorspace ! directdrawsink
> >         >
> >         > the pipeline is blocked on PREROLLING and in debug mode I
> >         can see that
> >         > the last state of my plugin is PAUSED.
> >         > Here the snipped of code in which I set the buffer:
> >         >
> >         >
> >         >
> >         > /* get_range function
> >         >  * makes it a source of a stream
> >         >  */
> >         > static gboolean gst_plugin_template_get_range (GstPad *pad,
> >         guint64
> >         > offset, guint lenght, GstBuffer **buf)
> >         > {
> >         >     static  gboolean white=1;
> >         >
> >         >     GstPluginTemplate *plug= GST_PLUGIN_TEMPLATE
> >         (GST_OBJECT_PARENT
> >         > (pad) );
> >         >
> >         >      GstBuffer *buffer;
> >         >       gint size, width, height, bpp;
> >         >       width = 320; height = 240; bpp = 16;
> >         >       size = width * height * bpp;
> >         >       buffer = gst_buffer_new();
> >         >       GST_BUFFER_SIZE (buffer) = size;
> >         >
> >         >     if (white)GST_BUFFER_MALLOCDATA (buffer) =  g_memdup
> >         (0xff,size);
> >         >         else GST_BUFFER_MALLOCDATA (buffer) =  g_memdup
> >         (0x0,size);
> >         >
> >         >     white=!white;
> >         >
> >         >       GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA
> >         (buffer);
> >         >
> >         >
> >         >     ts = gst_util_uint64_scale_int (frame_num * GST_SECOND,
> >         FPS_DEN,
> >         > FPS_NUM);
> >         >     next_ts = gst_util_uint64_scale_int ((frame_num + 1) *
> >         GST_SECOND,
> >         > FPS_DEN,  FPS_NUM);
> >         >
> >         >     GST_BUFFER_TIMESTAMP (buffer) = ts;
> >         >     GST_BUFFER_DURATION (buffer) = next_ts-ts;
> >         >
> >         >     frame_num++;
> >         >
> >         >
> >         >     return gst_pad_push (plug->srcpad, buffer);
> >         >
> >         > }
> >         >
> >         This is completely wrong.  In a get_range function, you are
> >         supposed to
> >         return the buffer to the supplied location!  Take a look at
> >         gstreamer/docs/design/part-scheduling.txt [1] and other docs
> >         in that
> >         directory to get some insight.
> >
> >         [1]:
> >
> http://webcvs.freedesktop.org/gstreamer/gstreamer/docs/design/part-scheduling.txt?view=markup
> >         >
> >         > I thought that setting the timestamp is enough to have
> >         continuosly a
> >         > stream of images but it seems that I'm wrong.
> >         > Do I must force the state of the plugin in PLAY mode?
> >         > Or maybe I'm wrong with the buffer management?
> >         >
> >         > Any help will be very appreciate becouse I'm new to plugin
> >         writing...
> >         >
> >         >
> >         > Best Regards.
> >         >
> >         >
> >         >
> >         > --
> >         > Riccardo Corona
> >
> >         --
> >         Regards,
> >           René Stadler
> >
> >
> >
> >
> > --
> > Riccardo Corona
>
> --
> Regards,
>   René Stadler
>
>


-- 
Riccardo Corona
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