Problem in getting the entire frame from gstbuffer at once

[Kiran Kumar]

Hi Nicolas,

Since I am getting the input from filesrc, I had to change the blocksize of
filesrc. Now it is working according to my requirement.

On Wed, Jun 15, 2016 at 4:35 AM, Nicolas Dufresne <nicolas at ndufresne.ca>
wrote:

>
> Le 2016-06-15 05:31, "Kiran Kumar" <kirank3240 at gmail.com> a écrit :
> >
> > Hi,
> >
> > I am new to gstreamer. I am writing a plugin by referring gstreamer
> plugin writers guide.
> >
> > My gst-launch command line looks like  gst-launch-1.0 filesrc
> location=mandrill.pgm ! image/pgm,width=512,height=512,framerate=1/1 !
> mynewplugin ! filesink location=image_out.pgm
> >
> > I am trying to process the data buffer inside _chain() function of my
> new plugin.
> >
> > Problem:
> > GstMapInfo map;
> > static GstFlowReturn
> > gst_mynewplugin_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
> > {
> >       [....]
> >
> >         gst_buffer_map (buf, &map, GST_MAP_READ);
> >         g_print("buffer size=%d\n", map.size);
> >
> >        [.......]
> > }
> >
> > The input image size is 512x512x8(bit depth)=2097152 bits. But, map.size
> is always = 4096 bytes.
> >
> > My requirement:
> > 1. I need the entire frame i.e., 2097152 bits at once and not in the
> form of series of chunks where each chunk size is 4096 bytes.
> > 2. The filter which I'm using inside my new plugin needs the entire
> frame as its input and not chunks of the frame.
> >
> > Questions:
> > 1. How to get the entire image frame at once in "map.data"?
> > 2. What am I missing here?
>
> I believe your implementing a pgm decoder. Use GstVideoDecoder and
> implement parse virtual method.
>
> >
> > I really need someones help.
> >
> > Thanks in advance.
> >
> > Kiran
> >
> > _______________________________________________
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> > gstreamer-devel at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> >
>
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