Copyright	Will Thompson and Iñaki García Etxebarria
License	LGPL-2.1
Maintainer	Iñaki García Etxebarria
Safe Haskell	Safe-Inferred
Language	Haskell2010

GI.GstVideo.Structs.VideoScaler

Contents

Exported types
Methods

Description

VideoScaler is a utility object for rescaling and resampling video frames using various interpolation / sampling methods.

Synopsis

newtype VideoScaler = VideoScaler (ManagedPtr VideoScaler)
videoScaler2d :: (HasCallStack, MonadIO m) => VideoScaler -> VideoScaler -> VideoFormat -> Ptr () -> Int32 -> Ptr () -> Int32 -> Word32 -> Word32 -> Word32 -> Word32 -> m ()
videoScalerFree :: (HasCallStack, MonadIO m) => VideoScaler -> m ()
videoScalerGetCoeff :: (HasCallStack, MonadIO m) => VideoScaler -> Word32 -> Word32 -> Word32 -> m Double
videoScalerGetMaxTaps :: (HasCallStack, MonadIO m) => VideoScaler -> m Word32
videoScalerHorizontal :: (HasCallStack, MonadIO m) => VideoScaler -> VideoFormat -> Ptr () -> Ptr () -> Word32 -> Word32 -> m ()
videoScalerVertical :: (HasCallStack, MonadIO m) => VideoScaler -> VideoFormat -> Ptr () -> Ptr () -> Word32 -> Word32 -> m ()

Exported types

newtype VideoScaler Source #

Memory-managed wrapper type.

Constructors

VideoScaler (ManagedPtr VideoScaler)

Instances

Instances details

Eq VideoScaler Source #
Instance details Defined in GI.GstVideo.Structs.VideoScaler Methods (==) :: VideoScaler -> VideoScaler -> Bool # (/=) :: VideoScaler -> VideoScaler -> Bool #
BoxedPtr VideoScaler Source #
Instance details Defined in GI.GstVideo.Structs.VideoScaler Methods boxedPtrCopy :: VideoScaler -> IO VideoScaler # boxedPtrFree :: VideoScaler -> IO () #
ManagedPtrNewtype VideoScaler Source #
Instance details Defined in GI.GstVideo.Structs.VideoScaler Methods toManagedPtr :: VideoScaler -> ManagedPtr VideoScaler #

Methods

Click to display all available methods, including inherited ones

Expand

Methods

2d, free, horizontal, vertical.

Getters

getCoeff, getMaxTaps.

Setters

None.

2d

videoScaler2d Source #

Arguments

:: (HasCallStack, MonadIO m)
=> VideoScaler	`hscale`: a horizontal `VideoScaler`
-> VideoScaler	`vscale`: a vertical `VideoScaler`
-> VideoFormat	`format`: a `VideoFormat` for `srcs` and `dest`
-> Ptr ()	`src`: source pixels
-> Int32	`srcStride`: source pixels stride
-> Ptr ()	`dest`: destination pixels
-> Int32	`destStride`: destination pixels stride
-> Word32	`x`: the horizontal destination offset
-> Word32	`y`: the vertical destination offset
-> Word32	`width`: the number of output pixels to scale
-> Word32	`height`: the number of output lines to scale
-> m ()

Scale a rectangle of pixels in src with srcStride to dest with destStride using the horizontal scaler hscaler and the vertical scaler vscale.

One or both of hscale and vscale can be NULL to only perform scaling in one dimension or do a copy without scaling.

x and y are the coordinates in the destination image to process.

free

videoScalerFree Source #

Arguments

:: (HasCallStack, MonadIO m)
=> VideoScaler	`scale`: a `VideoScaler`
-> m ()

Free a previously allocated VideoScaler scale.

getCoeff

videoScalerGetCoeff Source #

Arguments

:: (HasCallStack, MonadIO m)
=> VideoScaler	`scale`: a `VideoScaler`
-> Word32	`outOffset`: an output offset
-> Word32	`inOffset`: result input offset
-> Word32	`nTaps`: result n_taps
-> m Double	Returns: an array of `nTap` gdouble values with filter coefficients.

For a given pixel at outOffset, get the first required input pixel at inOffset and the nTaps filter coefficients.

Note that for interlaced content, inOffset needs to be incremented with 2 to get the next input line.

getMaxTaps

videoScalerGetMaxTaps Source #

Arguments

:: (HasCallStack, MonadIO m)
=> VideoScaler	`scale`: a `VideoScaler`
-> m Word32	Returns: the maximum number of taps

Get the maximum number of taps for scale.

horizontal

videoScalerHorizontal Source #

Arguments

:: (HasCallStack, MonadIO m)
=> VideoScaler	`scale`: a `VideoScaler`
-> VideoFormat	`format`: a `VideoFormat` for `src` and `dest`
-> Ptr ()	`src`: source pixels
-> Ptr ()	`dest`: destination pixels
-> Word32	`destOffset`: the horizontal destination offset
-> Word32	`width`: the number of pixels to scale
-> m ()

Horizontally scale the pixels in src to dest, starting from destOffset for width samples.

vertical

videoScalerVertical Source #

Arguments

:: (HasCallStack, MonadIO m)
=> VideoScaler	`scale`: a `VideoScaler`
-> VideoFormat	`format`: a `VideoFormat` for `srcs` and `dest`
-> Ptr ()	`srcLines`: source pixels lines
-> Ptr ()	`dest`: destination pixels
-> Word32	`destOffset`: the vertical destination offset
-> Word32	`width`: the number of pixels to scale
-> m ()

Vertically combine width pixels in the lines in srcLines to dest. dest is the location of the target line at destOffset and srcs are the input lines for destOffset.