RgbMatrix.java
/*
* Copyright 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.media3.effect;
import android.content.Context;
import androidx.media3.common.VideoFrameProcessingException;
import androidx.media3.common.util.UnstableApi;
import com.google.common.collect.ImmutableList;
/**
* Specifies a 4x4 RGB color transformation matrix to apply to each frame in the fragment shader.
*/
@UnstableApi
public interface RgbMatrix extends GlEffect {
/**
* Returns the 4x4 RGB transformation {@linkplain android.opengl.Matrix matrix} to apply to the
* color values of each pixel in the frame with the given timestamp.
*
* @param presentationTimeUs The timestamp of the frame to apply the matrix on.
* @param useHdr If {@code true}, colors will be in linear RGB BT.2020. If {@code false}, colors
* will be in linear RGB BT.709. Must be consistent with {@code useHdr} in {@link
* #toGlShaderProgram(Context, boolean)}.
* @return The {@code RgbMatrix} to apply to the frame.
*/
float[] getMatrix(long presentationTimeUs, boolean useHdr);
@Override
default BaseGlShaderProgram toGlShaderProgram(Context context, boolean useHdr)
throws VideoFrameProcessingException {
return DefaultShaderProgram.create(
context,
/* matrixTransformations= */ ImmutableList.of(),
/* rgbMatrices= */ ImmutableList.of(this),
useHdr);
}
}