Not able to use downstream (kmssink) bufferpool in omx decoder component

[Nicolas Dufresne]

Le dimanche 15 janvier 2017 à 05:06 -0800, Devarsh Thakkar a écrit :
> Hi,
> 
> I am using below pipeline :
> 
> /gst-launch-1.0 ! filesrc <input_file> ! h264parse ! omxh264dec ! kmssink/
> 
> After inserting some debug messages (after gst_is_kms_memory() in kmssink
> code) i got to know that omxh264dec doesn't use downstream i.e kmssink
> bufferpool, 

That is exact. This was never implemented as no-one had access to an
OMX component that supported doing so. A component that supports that
would implement UseBuffer method on the output port. If your component
supports it, and the color format and strides are compatible, then it
would be a great opportunity to enhance gst-omx.

> 
> however when I use below pipeline, kmssink bufferpool is used  :
> /gst-launch-1.0 videotestsrc ! 'video/x-raw, format=(string)NV12, width=176,
> height=144, framerate=30/1' ! kmssink/
> 
> QUESTIONS :
> Any ideas on what changes need to be done in gst-omx so that it uses kmssink
> buffer pool?
> Any examples of omxh264dec using downstream bufferpool would also be
> helpful.
> 
> I think if downstream element is able to provide a buffer pool and omx
> component uses it than it should increase the performance of overall
> pipeline, isn't omxvideodec code designed such a way to handle this or am I
> missing something?
> 
> Kindly let me know if there is anything wrong with my understanding as I am
> a gstreamer newbie.
> Thanks in advance.
> 
> Best Regards,
> Devarsh
> 
> 
> 
> --
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