HW Accelerated Resizing/Scaler plugin not accepting caps

[rathaval]

Hello Gst Community,

I'm trying to write a plugin that is based on the Video Filter as its base
class. It works well for no-resizing,
1:1 pass through pipelines.

gst-launch-1.0 videotestsrc ! xm2mvscaler device=/dev/xm2mvsc0 batch-size=1
buffer-mode=2 ! video/x-raw,format=RGB,width=1280,height=720,framerate=30/1
! videoconvert ! fpsdisplaysink videosink="kmssink driver-name=xilinx_drm
plane-id=26" text-overlay=false
/(Working pipeline)/

When I try to scale it :
gst-launch-1.0 videotestsrc !
video/x-raw,format=RGB,width=1280,height=720,framerate=30/1 ! xm2mvscaler
device=/dev/xm2mvsc0 batch-size=1 buffer-mode=2 !
video/x-raw,format=RGB,width=1920,height=1080,framerate=30/1 ! videoconvert
! fpsdisplaysink videosink="kmssink driver-name=xilinx_drm plane-id=26"
text-overlay=false
WARNING: erroneous pipeline: could not link xm2mvscaler0 to videoconvert0

and it *errors out*. After reading a little more of the gstvideofilter.c
source code, it appears basing off the VideoFilter class may not be the
right thing as it maps the frames for you.


*
My question is what is the best way to map input buffers and output buffers
for HW Accelerated scalers? And does a VideoFilter not support resizing at
all ? I'd be glad to post more information, but a hint towards what's not
working would be very helpful. *

Looking at gst_video_filter_transform_size routine, I suspect it does not
allow resizing.
===
Logs
0:00:04.053976831  2358     0x30b1c890 DEBUG             capsfilter
gstcapsfilter.c:295:gst_capsfilter_transform_caps:<capsfilter1> input:    
ANY
0:00:04.054003403  2358     0x30b1c890 DEBUG             capsfilter
gstcapsfilter.c:296:gst_capsfilter_transform_caps:<capsfilter1> filter:   
(NULL)
0:00:04.054028636  2358     0x30b1c890 DEBUG             capsfilter
gstcapsfilter.c:298:gst_capsfilter_transform_caps:<capsfilter1> caps filter:   
video/x-raw, format=(string)RGB, width=(int)1920, height=(int)1080,
framerate=(fraction)30/1
0:00:04.054070900  2358     0x30b1c890 DEBUG             capsfilter
gstcapsfilter.c:299:gst_capsfilter_transform_caps:<capsfilter1> intersect:
video/x-raw, format=(string)RGB, width=(int)1920, height=(int)1080,
framerate=(fraction)30/1
0:00:04.054115894  2358     0x30b1c890 DEBUG               GST_PADS
gstpad.c:3938:gst_pad_query:<capsfilter1:sink> sent query 0x30c518a0 (caps),
result 1
0:00:04.054153528  2358     0x30b1c890 INFO                GST_PADS
gstpad.c:2371:gst_pad_link_prepare: caps are incompatible
0:00:04.054178351  2358     0x30b1c890 INFO                GST_PADS
gstpad.c:2464:gst_pad_link_full: link between xm2mvscaler0:src and
capsfilter1:sink failed: no common format
===
gst-inspect-1.0 output :
root at peta_xm2m_vscaler:~# gst-inspect-1.0 xm2mvscaler
Factory Details:
  Rank                     none (0)
  Long-name                Xilinx M2M Video Scaler
  Klass                    Xilinx M2M Video Scaler
  Description              Xilinx M2M Video Scaler
  Author                   Rohit Athavale <rohit.athavale at xilinx.com>

Plugin Details:
  Name                     xm2mvscaler
  Description              Xilinx M2M Scaler plugin
  Filename                 /usr/lib/gstreamer-1.0/libgstxm2mvscaler.so
  Version                  0.6
  License                  LGPL
  Source module            xm2mvscaler
  Binary package           GStreamer
  Origin URL               http://gstreamer.net/

GObject
 +----GInitiallyUnowned
       +----GstObject
             +----GstElement
                   +----GstBaseTransform
                         +----GstVideoFilter
                               +----GstXm2mVScaler

Pad Templates:
  SINK template: 'sink'
    Availability: Always
    Capabilities:
      video/x-raw
                 format: { RGB }
                  width: [ 1, 3840 ]
                 height: [ 1, 2160 ]
              framerate: [ 0/1, 2147483647/1 ]

  SRC template: 'src'
    Availability: Always
    Capabilities:
      video/x-raw
                 format: { RGB }
                  width: [ 1, 3840 ]
                 height: [ 1, 2160 ]
              framerate: [ 0/1, 2147483647/1 ]


Element Flags:
  no flags set

Element Implementation:
  Has change_state() function: gst_element_change_state_func

Element has no clocking capabilities.
Element has no URI handling capabilities.

Pads:
  SINK: 'sink'
    Pad Template: 'sink'
  SRC: 'src'
    Pad Template: 'src'

Element Properties:
  name                : The name of the object
                        flags: readable, writable
                        String. Default: "xm2mvscaler0"
  parent              : The parent of the object
                        flags: readable, writable
                        Object of type "GstObject"
  qos                 : Handle Quality-of-Service events
                        flags: readable, writable
                        Boolean. Default: true
  buffer-mode         : Buffer Mode
                        flags: readable, writable
                        Enum "GstXm2mVScalerBufferMode" Default: 0, ""
                           (1): DMABUF           - GST_XM2MVSC_BUF_DMABUF
                           (2): Driver allocated contiguous memory -
GST_XM2MVSC_BUF_KERNEL_DRV
  batch-size          : Frame Batch Size
                        flags: readable, writable
                        Enum "GstXm2mVScalerBatchSize" Default: 0, ""
                           (1): One              -
GST_XM2MVSCALER_BATCH_SIZE_ONE
                           (2): Two              -
GST_XM2MVSCALER_BATCH_SIZE_TWO
                           (8): Eight            -
GST_XM2MVSCALER_BATCH_SIZE_EIGHT
  device              : Location of Device File being used
                        flags: readable, writable
                        String. Default: "/dev/xm2mvsc0"




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