GlMatrixTransformation

Kotlin |Java

@UnstableApi
public interface GlMatrixTransformation extends GlEffect

Known direct subclasses

MatrixTransformation

MatrixTransformation

Specifies a 3x3 transformation Matrix to apply in the vertex shader for each frame.

Known indirect subclasses

Crop, Presentation, ScaleAndRotateTransformation

`Crop`	Specifies a crop to apply in the vertex shader.
`Presentation`	Controls how a frame is presented with options to set the output resolution and choose how to map the input pixels onto the output frame geometry (for example, by stretching the input frame to match the specified output frame, or fitting the input frame using letterboxing).
`ScaleAndRotateTransformation`	Specifies a simple rotation and/or scale to apply in the vertex shader.

Specifies a 4x4 transformation Matrix to apply in the vertex shader for each input frame.

The matrix is applied to points given in normalized device coordinates (-1 to 1 on x, y, and z axes). Transformed pixels that are moved outside of the normal device coordinate range are clipped.

Output frame pixels outside of the transformed input frame will be black, with alpha = 0 if applicable.

Summary

Public methods
`default Size`	`configure(int inputWidth, int inputHeight)` Configures the input and output dimensions.
`abstract float[]`	`getGlMatrixArray(long presentationTimeUs)` Returns the 4x4 transformation `Matrix` to apply to the frame with the given timestamp.
`default int`	`@C.TextureMinFilter getGlTextureMinFilter()` Returns the `texture minification filter` to use for sampling the input texture when applying this matrix transformation.
`default BaseGlShaderProgram`	`toGlShaderProgram(Context context, boolean useHdr)` Returns a `GlShaderProgram` that applies the effect.

Inherited methods

From androidx.media3.common.Effect

default 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

default boolean

isNoOp(int inputWidth, int inputHeight)

Returns whether a GlEffect applies no change at every timestamp.

Public methods

configure

default Size configure(int inputWidth, int inputHeight)

Configures the input and output dimensions.

Must be called before getGlMatrixArray.

Parameters
`int inputWidth`	The input frame width, in pixels.
`int inputHeight`	The input frame height, in pixels.

Returns
`Size`	The output frame width and height, in pixels.

getGlMatrixArray

abstract float[] getGlMatrixArray(long presentationTimeUs)

Returns the 4x4 transformation Matrix to apply to the frame with the given timestamp.

getGlTextureMinFilter

@C.TextureMinFilter
default int getGlTextureMinFilter()

Returns the texture minification filter to use for sampling the input texture when applying this matrix transformation.

toGlShaderProgram

default BaseGlShaderProgram 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`.