org.jcodec.codecs.h264.io.model.NALUnit Maven / Gradle / Ivy

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Pure Java implementation of video/audio codecs and formats

There is a newer version: 0.2.5

package org.jcodec.codecs.h264.io.model;
import java.nio.ByteBuffer;

/**
 * This class is part of JCodec ( www.jcodec.org ) This software is distributed
 * under FreeBSD License
 * 
 * Network abstraction layer (NAL) unit
 * 
 * @author The JCodec project
 * 
 */
public class NALUnit {

    public NALUnitType type;
    public int nal_ref_idc;

    public NALUnit(NALUnitType type, int nal_ref_idc) {
        this.type = type;
        this.nal_ref_idc = nal_ref_idc;
    }

    public static NALUnit read(ByteBuffer _in) {
        int nalu = _in.get() & 0xff;
        int nal_ref_idc = (nalu >> 5) & 0x3;
        int nb = nalu & 0x1f;

        NALUnitType type = NALUnitType.fromValue(nb);
        return new NALUnit(type, nal_ref_idc);
    }

    public void write(ByteBuffer out) {
        int nalu = type.getValue() | (nal_ref_idc << 5);
        out.put((byte) nalu);
    }
}