TI Scaler

tiscaler is used to scale up or scale down frames and also crop. If cropping feature is used, input region is cropped first followed by scaling. It uses GstVideoFilter class and ARM NEON optimized kernel to scale the frame.

Hierarchy

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

Pad templates

sink

       video/x-raw
                 format: { (string)NV12 }
                 width: [ 1, 8192 ]
                 height: [ 1, 8192 ]

Availability – always

Direction – sink

Object type – GstPad

src

      video/x-raw
                 format: { (string)NV12 }
                 width: [ 1, 8192 ]
                 height: [ 1, 8192 ]

Availability – always

Direction – src

Object type – GstPad

Properties

method

Interpolation method

Flags : Read / Write

Enum "GstTIScalerMethod" (0): nearest-neighbour - Nearest Neighbour Interpolation (1): bilinear - Bilinear Interpolation

Default value : (1)-Bilinear Interpolation

name

The name of the object

String Default value : "tiscaler0"

parent

The parent of the object

Flags : Read / Write

GstObject Default value : N/A

qos

Handle Quality-of-Service events Flags : Read / Write

Boolean Default value : false

roi-height

Height of the cropped region of interest

Unsigned Integer Default value : Input Height

roi-startx

Starting X coordinate of the cropped region of interest

Unsigned Integer Default value : 0

roi-starty

Starting Y coordinate of the cropped region of interest

Unsigned Integer Default value : 0

roi-width

Width of the cropped region of interest

Unsigned Integer Default value : Input Width

Pipeline examples

Single scaler without cropping

gst-launch-1.0 videotestsrc ! video/x-raw,format=NV12,width=640,height=360 ! \
tiscaler ! video/x-raw,width=1280,height=720 ! fakesink

Single scaler with cropping

gst-launch-1.0 videotestsrc ! video/x-raw,format=NV12,width=640,height=360 ! \
tiscaler roi-startx=100 roi-starty=50 roi-width=250 roi-height=300 ! \
video/x-raw,width=1280,height=720 ! fakesink