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BoofCV is an open source Java library for real-time computer vision and robotics applications.
There is a newer version: 1.1.6
/*
 * Copyright (c) 2021, Peter Abeles. All Rights Reserved.
 *
 * This file is part of BoofCV (http://boofcv.org).
 *
 * 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 boofcv.core.encoding;

import boofcv.concurrency.BoofConcurrency;
import boofcv.core.encoding.impl.ImplConvertNV21;
import boofcv.core.encoding.impl.ImplConvertNV21_MT;
import boofcv.core.encoding.impl.ImplConvertYV12;
import boofcv.core.encoding.impl.ImplConvertYV12_MT;
import boofcv.struct.image.*;

/**
 * YUV / YCbCr image format. The Y component is contained in the width*height block, followed by a (width/2)*(height/2) block
 * for Cb and then a block of the same size for Cr.
 *
 * @author Peter Abeles
 */
public class ConvertYV12 {

	/**
	 * Converts a YU12 encoded byte array into a BoofCV formatted image.
	 *
	 * @param data (input) YU12 byte array
	 * @param width (input) image width
	 * @param height (input) image height
	 * @param output (output) BoofCV image
	 */
	public static void yu12ToBoof( byte[] data, int width, int height, ImageBase output ) {

		if (output instanceof Planar) {
			Planar pl = (Planar)output;
			pl.reshape(width, height, 3);

			if (BoofConcurrency.USE_CONCURRENT) {
				if (pl.getBandType() == GrayU8.class) {
					ImplConvertYV12_MT.yv12ToPlanarRgb_U8(data, pl);
				} else if (pl.getBandType() == GrayF32.class) {
					ImplConvertYV12_MT.yv12ToPlanarRgb_F32(data, pl);
				} else {
					throw new IllegalArgumentException("Unsupported output band format");
				}
			} else {
				if (pl.getBandType() == GrayU8.class) {
					ImplConvertYV12.yv12ToPlanarRgb_U8(data, pl);
				} else if (pl.getBandType() == GrayF32.class) {
					ImplConvertYV12.yv12ToPlanarRgb_F32(data, pl);
				} else {
					throw new IllegalArgumentException("Unsupported output band format");
				}
			}
		} else if (output instanceof ImageGray) {
			if (output.getClass() == GrayU8.class) {
				yu12ToGray(data, width, height, (GrayU8)output);
			} else if (output.getClass() == GrayF32.class) {
				yu12ToGray(data, width, height, (GrayF32)output);
			} else {
				throw new IllegalArgumentException("Unsupported output type");
			}
		} else if (output instanceof ImageInterleaved) {
			((ImageMultiBand)output).reshape(width, height, 3);

			if (BoofConcurrency.USE_CONCURRENT) {
				if (output.getClass() == InterleavedU8.class) {
					ImplConvertYV12_MT.yv12ToInterleaved(data, (InterleavedU8)output);
				} else if (output.getClass() == InterleavedF32.class) {
					ImplConvertYV12_MT.yv12ToInterleaved(data, (InterleavedF32)output);
				} else {
					throw new IllegalArgumentException("Unsupported output type");
				}
			} else {
				if (output.getClass() == InterleavedU8.class) {
					ImplConvertYV12.yv12ToInterleaved(data, (InterleavedU8)output);
				} else if (output.getClass() == InterleavedF32.class) {
					ImplConvertYV12.yv12ToInterleaved(data, (InterleavedF32)output);
				} else {
					throw new IllegalArgumentException("Unsupported output type");
				}
			}
		} else {
			throw new IllegalArgumentException("Boofcv image type not yet supported");
		}
	}

	/**
	 * Converts an YV12 image into a gray scale U8 image.
	 *
	 * @param data Input: YV12 image data
	 * @param width Input: image width
	 * @param height Input: image height
	 * @param output Output: Optional storage for output image. Can be null.
	 * @return Gray scale image
	 */
	public static GrayU8 yu12ToGray( byte[] data, int width, int height, GrayU8 output ) {
		if (output != null) {
			output.reshape(width, height);
		} else {
			output = new GrayU8(width, height);
		}

		if (BoofConcurrency.USE_CONCURRENT) {
			ImplConvertNV21_MT.nv21ToGray(data, output);
		} else {
			ImplConvertNV21.nv21ToGray(data, output);
		}

		return output;
	}

	/**
	 * Converts an YV12 image into a gray scale F32 image.
	 *
	 * @param data Input: YV12 image data
	 * @param width Input: image width
	 * @param height Input: image height
	 * @param output Output: Optional storage for output image. Can be null.
	 * @return Gray scale image
	 */
	public static GrayF32 yu12ToGray( byte[] data, int width, int height, GrayF32 output ) {
		if (output != null) {
			output.reshape(width, height);
		} else {
			output = new GrayF32(width, height);
		}

		if (BoofConcurrency.USE_CONCURRENT) {
			ImplConvertNV21_MT.nv21ToGray(data, output);
		} else {
			ImplConvertNV21.nv21ToGray(data, output);
		}

		return output;
	}
}