Copyright	Will Thompson Iñaki García Etxebarria and Jonas Platte
License	LGPL-2.1
Maintainer	Iñaki García Etxebarria (inaki@blueleaf.cc)
Safe Haskell	None
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)
noVideoScaler :: Maybe 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

WrappedPtr VideoScaler Source #
Instance details Defined in GI.GstVideo.Structs.VideoScaler Methods wrappedPtrCalloc :: IO (Ptr VideoScaler) # wrappedPtrCopy :: VideoScaler -> IO VideoScaler # wrappedPtrFree :: Maybe (GDestroyNotify VideoScaler) #

noVideoScaler :: Maybe VideoScaler Source #

A convenience alias for Nothing :: Maybe VideoScaler.

Methods

2d

videoScaler2d Source #

Arguments

:: (HasCallStack, MonadIO m)
=> VideoScaler	`hscale`: a horzontal `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, as obtained with gst_video_scaler_get_info().