SeparableConvolution

Kotlin |Java

@UnstableApi
public abstract class SeparableConvolution implements GlEffect

Known direct subclasses

`GaussianBlurWithFrameOverlaid`	A `SeparableConvolution` to apply a Gaussian blur on image data.
`GaussianBlur`	A `SeparableConvolution` to apply a Gaussian blur on image data.

A GlEffect for performing separable convolutions.

A single 1D convolution function is applied horizontally on a first pass and vertically on a second pass.

Summary

Public constructors
`SeparableConvolution()` Creates an instance with `scaleWidth` and `scaleHeight` set to `1.0f`.
`SeparableConvolution(float scaleWidth, float scaleHeight)` Creates an instance.

Public methods
`abstract ConvolutionFunction1D`	`getConvolution(long presentationTimeUs)` Returns a `1D convolution function`.
`GlShaderProgram`	`toGlShaderProgram(Context context, boolean useHdr)` Returns a `GlShaderProgram` that applies the effect.

long

getDurationAfterEffectApplied(long durationUs)

Returns the expected duration of the output stream when the effect is applied given a input durationUs.

boolean

isNoOp(int inputWidth, int inputHeight)

Returns whether a GlEffect applies no change at every timestamp.

public SeparableConvolution()

Creates an instance with scaleWidth and scaleHeight set to 1.0f.

public SeparableConvolution(float scaleWidth, float scaleHeight)

Creates an instance.

Parameters
`float scaleWidth`	The scaling factor used to determine the width of the output relative to the input.
`float scaleHeight`	The scaling factor used to determine the height of the output relative to the input.

public abstract ConvolutionFunction1D getConvolution(long presentationTimeUs)

Parameters
`long presentationTimeUs`	The presentation timestamp of the input frame, in microseconds.

public GlShaderProgram toGlShaderProgram(Context context, boolean useHdr)

Returns a GlShaderProgram that applies the effect.

Parameters
`Context context`	A `Context`.
`boolean useHdr`	Whether input textures come from an HDR source. If `true`, colors will be in linear RGB BT.2020. If `false`, colors will be in linear RGB BT.709.

Throws
`androidx.media3.common.VideoFrameProcessingException`	If an error occurs while creating the `GlShaderProgram`.