LanczosResample

Artifact: androidx.media3:media3-effect

View Source

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Kotlin |Java

@UnstableApi
public final class LanczosResample implements GlEffect

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A GlEffect that applies a Lanczos-windowed sinc function when resampling an image. See Filters for Common Resampling Tasks, Ken Turkowski.

The filter rescales images in both dimensions with the same scaling factor.

Summary

Public methods
static LanczosResample	scaleToFit(@IntRange(from = 1) int width, @IntRange(from = 1) int height) Creates an instance.
GlShaderProgram	toGlShaderProgram(Context context, boolean useHdr) Returns a GlShaderProgram that applies the effect.

Inherited methods
From androidx.media3.common.Effect long getDurationAfterEffectApplied(long durationUs) Returns the expected duration of the output stream when the effect is applied given a input durationUs.
From androidx.media3.effect.GlEffect boolean isNoOp(int inputWidth, int inputHeight) Returns whether a GlEffect applies no change at every timestamp.

Public methods

scaleToFit

public static LanczosResample scaleToFit(@IntRange(from = 1) int width, @IntRange(from = 1) int height)

Creates an instance.

Parameters
@IntRange(from = 1) int width	The width inside which the output contents will fit.
@IntRange(from = 1) int height	The height inside which the output contents will fit.

toGlShaderProgram

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 .