GlMatrixTransformation

@UnstableApi
public interface GlMatrixTransformation extends GlEffect

Known direct subclasses
MatrixTransformation

Specifies a 3x3 transformation Matrix to apply in the vertex shader for each frame.
Known indirect subclasses
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 BaseGlShaderProgram
toGlShaderProgram(Context context, boolean useHdr)

Returns a GlShaderProgram that applies the effect.

Inherited methods
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.

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 .