Package org.freedesktop.gstreamer.video

Class VideoScaler

java.lang.Object

io.github.jwharm.javagi.base.ProxyInstance

org.freedesktop.gstreamer.video.VideoScaler

All Implemented Interfaces:

Proxy

@Generated("io.github.jwharm.JavaGI")
public class VideoScaler
extends ProxyInstance

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

Constructor Summary

Constructors

Constructor	Description
VideoScaler(MemorySegment address)	Create a VideoScaler proxy instance for the provided memory address.

Method Summary

Modifier and Type	Method	Description
void	_2d(VideoScaler vscale, VideoFormat format, @Nullable MemorySegment src, int srcStride, @Nullable MemorySegment dest, int destStride, int x, int y, int width, int height)	Scale a rectangle of pixels in src with srcStride to dest with destStride using the horizontal scaler hscaler and the vertical scaler vscale.
VideoScaler	combinePackedYUV(VideoScaler uvScale, VideoFormat inFormat, VideoFormat outFormat)	Combine a scaler for Y and UV into one scaler for the packed format.
void	free()	Free a previously allocated GstVideoScaler this VideoScaler.
MemorySegment	getCoeff(int outOffset, @Nullable Out<Integer> inOffset, @Nullable Out<Integer> nTaps)	For a given pixel at outOffset, get the first required input pixel at inOffset and the nTaps filter coefficients.
int	getMaxTaps()	Get the maximum number of taps for this VideoScaler.
void	horizontal(VideoFormat format, @Nullable MemorySegment src, @Nullable MemorySegment dest, int destOffset, int width)	Horizontally scale the pixels in src to dest, starting from destOffset for width samples.
static VideoScaler	new_(VideoResamplerMethod method, Set<VideoScalerFlags> flags, int nTaps, int inSize, int outSize, @Nullable Structure options)	Make a new method video scaler.
static VideoScaler	new_(VideoResamplerMethod method, VideoScalerFlags flags, int nTaps, int inSize, int outSize, @Nullable Structure options)	Make a new method video scaler.
void	vertical(VideoFormat format, @Nullable MemorySegment srcLines, @Nullable MemorySegment dest, int destOffset, int width)	Vertically combine width pixels in the lines in srcLines to dest.

Methods inherited from class io.github.jwharm.javagi.base.ProxyInstance

equals, handle, hashCode

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Details

VideoScaler

public VideoScaler(MemorySegment address)

Create a VideoScaler proxy instance for the provided memory address.

Parameters:

address - the memory address of the native object

Method Details

new_

public static VideoScaler new_(VideoResamplerMethod method,
 Set<VideoScalerFlags> flags,
 int nTaps,
 int inSize,
 int outSize,
 @Nullable
 @Nullable Structure options)

Make a new method video scaler. inSize source lines/pixels will be scaled to outSize destination lines/pixels.

nTaps specifies the amount of pixels to use from the source for one output pixel. If n_taps is 0, this function chooses a good value automatically based on the method and inSize/outSize.

Parameters:

method - a GstVideoResamplerMethod

flags - GstVideoScalerFlags

nTaps - number of taps to use

inSize - number of source elements

outSize - number of destination elements

options - extra options

Returns:

a GstVideoScaler

new_

public static VideoScaler new_(VideoResamplerMethod method,
 VideoScalerFlags flags,
 int nTaps,
 int inSize,
 int outSize,
 @Nullable
 @Nullable Structure options)

Make a new method video scaler. inSize source lines/pixels will be scaled to outSize destination lines/pixels.

nTaps specifies the amount of pixels to use from the source for one output pixel. If n_taps is 0, this function chooses a good value automatically based on the method and inSize/outSize.

Parameters:

method - a GstVideoResamplerMethod

flags - GstVideoScalerFlags

nTaps - number of taps to use

inSize - number of source elements

outSize - number of destination elements

options - extra options

Returns:

a GstVideoScaler

_2d

public void _2d(VideoScaler vscale,
 VideoFormat format,
 @Nullable
 @Nullable MemorySegment src,
 int srcStride,
 @Nullable
 @Nullable MemorySegment dest,
 int destStride,
 int x,
 int y,
 int width,
 int height)

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 this VideoScaler 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.

Parameters:

vscale - a vertical GstVideoScaler

format - a GstVideoFormat for srcs and dest

src - source pixels

srcStride - source pixels stride

dest - destination pixels

destStride - destination pixels stride

x - the horizontal destination offset

y - the vertical destination offset

width - the number of output pixels to scale

height - the number of output lines to scale

combinePackedYUV

public VideoScaler combinePackedYUV(VideoScaler uvScale,
 VideoFormat inFormat,
 VideoFormat outFormat)

Combine a scaler for Y and UV into one scaler for the packed format.

Parameters:

uvScale - a scaler for the U and V components

inFormat - the input video format

outFormat - the output video format

Returns:

a new horizontal videoscaler for format.

free

public void free()

Free a previously allocated GstVideoScaler this VideoScaler.

getCoeff

public MemorySegment getCoeff(int outOffset,
 @Nullable
 @Nullable Out<Integer> inOffset,
 @Nullable
 @Nullable Out<Integer> nTaps)

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.

Parameters:

outOffset - an output offset

inOffset - result input offset

nTaps - result n_taps

Returns:

an array of nTap gdouble values with filter coefficients.

getMaxTaps

public int getMaxTaps()

Get the maximum number of taps for this VideoScaler.

Returns:

the maximum number of taps

horizontal

public void horizontal(VideoFormat format,
 @Nullable
 @Nullable MemorySegment src,
 @Nullable
 @Nullable MemorySegment dest,
 int destOffset,
 int width)

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

Parameters:

format - a GstVideoFormat for src and dest

src - source pixels

dest - destination pixels

destOffset - the horizontal destination offset

width - the number of pixels to scale

vertical

public void vertical(VideoFormat format,
 @Nullable
 @Nullable MemorySegment srcLines,
 @Nullable
 @Nullable MemorySegment dest,
 int destOffset,
 int width)

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.

Parameters:

format - a GstVideoFormat for srcs and dest

srcLines - source pixels lines

dest - destination pixels

destOffset - the vertical destination offset

width - the number of pixels to scale