A conformant image processing stage for resizing YUV420, RGB565 and
RGBA32 images. Using proprietary communication other image formats
can also be used as inputs. This component performs a resize, with
the output size determined by the input size and a custom resize
parameter or by directly setting the output port parameter. The input
images can either be stripes or full frames, in general stripes are
preferred for large images or for some image formats including RGB565.
The input image can also be cropped prior to resizing. Output images
can either be full frames or stripes, and may be a different colour
format from the input image.
| Port | Index | Notes
|
| 60 | OMX_IndexParamPortDefinition
| Set this to control the input size of the image. Typically this is
called by the component itself when this port is tunnelled with an
appropriate output port. The stripe height must be 16, or the frame
height rounded up to the next multiple of 16. YUV420 packed planar
image format is supported with even image dimensions. RGB565 and
RGBA32 formats are also supported, RGB565 input only supports 16 high
striped input. Other internal formats such as YUV_UV are also handled
when using prioritary communication on this port.
|
| OMX_IndexConfigCommonInputCrop
| Allows cropping at the input. Cropping can be changed at any time.
|
| OMX_IndexConfigBrcmUseProprietaryCallback
| Forces use of proprietary tunnelling between ports.
|
| OMX_IndexParamCameraPoolToEncoderFunction
| Used to set up proprietary communication with the previous component.
|
| 61 | OMX_IndexParamPortDefinition
| Query this to show what the output size will be. Set to alter the
number of buffers to be used, or change the size of the output image
if the custom resize setting is not being used. YUV image dimensions
must be even. nSliceHeight must be a multiple of 16, or 0 which
indicates no preference. nStride must be a multiple of 32, or a
multiple of 64 for RGBA32 format.
|
| OMX_IndexParamResize
| As an alternative to setting the output size directly through the port
definition, set this parameter to control how the resize operates.
|
| 60 61 | OMX_IndexParamImagePortFormat
| Set / query the image port format used. These ports support RGB565,
RGBA32 or YUV420 raw bitmap formats.
|
| OMX_IndexParamBrcmSupportsSlices
| Query the port for support of nSliceHeight=16.
|