ResizeYUV420Super
Changes the size of the NV12 image by the super sampling
interpolation method.
Syntax
IppStatus
ippiResizeYUV420Super_8u_P2R(const Ipp8u*
pSrcY
, Ipp32s
srcYStep
, const Ipp8u*
pSrcUV
, Ipp32s
srcUVStep
, Ipp8u*
pDstY
, Ipp32s
dstYStep
, Ipp8u*
pDstUV
, Ipp32s
dstUVStep
, IppiPoint
dstOffset
, IppiSize
dstSize
, const IppiResizeYUV420Spec*
pSpec
, Ipp8u*
pBuffer
);
Include Files
ippi.h
Domain Dependencies
Headers:
ippcore.h
, ippvm.h
, ipps.h
Libraries:
ippcore.lib
, ippvm.lib
, ipps.lib
Parameters
- pSrcY
- Pointer to the source image Y plane.
- srcYStep
- Distance in bytes between starts of consecutive lines in the source image Y plane.
- pSrcUV
- Pointer to the source image UV plane.
- srcUVStep
- Distance in bytes between starts of consecutive lines in the source image UV plane.
- pDstY
- Pointer to the destination image Y plane.
- dstYStep
- Distance in bytes between starts of consecutive lines in the destination image Y plane.
- pDstUV
- Pointer to the destination image UV plane.
- dstUVStep
- Distance in bytes between starts of consecutive lines in the destination image UV plane.
- dstOffset
- Offset of the tiled destination image with respect to the destination image origin.
- dstSize
- Size of the destination image in pixels.
- pSpec
- Pointer to the spec structure for the resize filter.
- pBuffer
- Pointer to the work buffer.
Description
This function changes an image size using interpolation with the
super sampling algorithm. The image size can be either reduced or increased in each
direction, depending on the destination image size.
This function operates with ROI (see ROI Processing in Geometric
Transforms). It resizes the source image ROI origin to the destination
image ROI origin. The destination image ROI origin must be defined by the following
parameters: the offset of the tiled destination image with respect to the
destination image origin and the destination image size. The source image ROI origin
is defined automatically. To obtain the source image ROI origin offset, call the
ippiResizeYUV420GetSrcOffset
function. Parameters pSrcY
, pSrcUV
and pDstY
, pDstUV
must point to the
processed source and destination image ROI origins respectively.The interpolation algorithm applied uses only pixels of the source
image origin that are inside of the image boundaries.
The source and destination images are in the 4:2:0 two-plane image
format (NV12): all Y samples (
pSrcY
) are found first in memory as an array of unsigned chars with
an even number of lines memory alignment, followed by an array (pSrcY
) of unsigned chars
containing interleaved U and V samples. Prior to using the
ippiResizeLinear
function, initialize the IppiResizeYUV420Spec
structure by calling the
ippiResizeYUV420LanczosInit
and compute the size of
the external buffer pBuffer
by calling the ippiResizeYUV420GetBufferSize
for the corresponding flavor. This function provides optimized code paths for the
following scaling factors along the
x
and y
axes: 1/2,
2/3, 3/4, 4/5, 5/6, 8/9, 1/3, 2/5, 3/5, 3/7, 4/9, 7/10, 1/4, 2/7, 3/8,
1/8.Return Values
- ippStsNoErr
- Indicates no error.
- ippStsNullPtrErr
- Indicates an error if one of the specified pointers isNULL.
- ippStsNoOperation
- Indicates a warning if width or height of the destination image is equal to zero.
- ippStsBorderErr
- Indicates an error if thebordervalue is illegal.
- ippStsContextMatchErr
- Indicates an error if pointer to the spec structure is invalid.
- ippStsSizeWrn
- Indicates a warning in the following cases:
- if width of the image is odd,
- if the destination image size is more than the destination image origin.
- ippStsSizeErr
- Indicates an error if width or height of the destination image is equal to 1; or if width or height of the source or destination image is negative.
- ippStsMisalignedOffsetErr
- Indicates an error if one of the fields of thedstOffsetparameter is odd.
- ippStsOutOfRangeErr
- Indicates an error if the destination image offset point is outside the destination image origin.