This component wraps the HVS (Hardware Video Scalar) hardware block to
offer hardware accelerated format conversion, blending, and resizing.
It has four inputs port taking numerous different formats, and one output port
which supports various RGB formats.
Port 380 can be considered the master input port. When both ports 380 and 385
have a bufferthen the component will generate the output buffer based on the
current set of buffers and parameters.
The additional input ports are used for providing extra items to be composed
into the output image. The ports are double-bufferred, only returning a buffer
once a new one has been sent to replace it. Sending an empty buffer to
these ports will return the current buffer and stop that port contributing to
the output image.
Please note that this component has been developed for use under MMAL. It has
not been tested at all under IL, so there may be unexpected behaviour under IL.
It is also not considered to be production quality code yet - please use with caution.
|380 381 382 383 384||OMX_IndexParamPortDefinition
|| Set this to control the geometry and format of the input buffers.
The stripe height requirements vary based on format, but must be
As an exception to the IL spec, this component supports updating this parameter
in any state. Buffer presented to the port will be interpreted with the settings
defined when the buffer is presented.
|| Setting this config allows control over how buffers passed on that port
contribute to the output frame.
Source rectangles may currently not take into account any cropping required by
It does not support the OMX_DISPLAY_MODE_FILL and OMX_DISPLAY_MODE_LETTERBOX
It assumes that OMX_DISPLAY_SET_NOASPECT is set, ie it will distort the image to
map the source/source rectangle into the destination rectangle.
Buffers will be displayed with the value of OMX_IndexConfigDisplayRegion set at
the point the buffer is submitted, even if it is subsequently updated.
|| Set/retrieve the image colour space settings that images received on
this port should be rendered with.
|| Used to set up proprietary communication with the previous component.
|| Forces use of proprietary tunnelling between ports.
|| Retrieves the capabilites of this component to allow any
nSliceHeight value >= nHeight.
|| Set / query this to control the geometry and format of the output buffers.
|380 381 382 383 384 385||OMX_IndexParamMinimumAlignment
|| Query the minimum alignment that the component requries on the port.
|| Set / query the image port format used.