problem in displaying PNG image?

[vijay]

Hi,
 I have written a png decoder plugin with sink as capabilities imge/png and
src with  capabilities GST_VIDEO_CAPS_RGB.
The decoder outputs data is raw RGB interleaved data.

I have set the caps as likes.(Input stream i used is having bpp = 24 and
depth = 24)
  caps = gst_caps_new_simple ("video/x-raw-rgb",
                                  "bpp", G_TYPE_INT, 24,

                                  "width",
G_TYPE_INT,filter->pngConfPar.u32Width,
                                  "height",
G_TYPE_INT,filter->pngConfPar.u32Height,
                                  "framerate", GST_TYPE_FRACTION, 0,1,
NULL);

  templ = gst_static_pad_template_get (&src_factory);

  res = gst_caps_intersect (caps, gst_pad_template_get_caps (templ));

  ret = gst_pad_set_caps (filter->srcpad, res);

When  i am trying to diplay the image using gst launch

gst-launch filesrc location=1.png ! MY_PNG_Decoder ! xvimagesink

I am getting the return type of gst_pad_push as  GST_FLOW_NOT_NEGOTIATED.

Can any one say what could be the problem?
How to display the png image and which plugin should i need to use for sink?


Regards,
Vijay P
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