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目前它只是一个物联网通信的工具，包含 1、西门子S7通信协议，支持西门子S1500，S1200，S400，S300，S200Smart，西门子机床828D; 2、Modbus通信协议，支持ModbusTcp, ModbusRtuOverTcp, ModbusAsciiOverTcp, ModbusTcpServer; 3、三菱Melsec（MC）通信协议，支持PLC iQ-R系列, Q/L系列, QnA系列, A系列, 目前只测试了L系列和FX5U; 4、RTSP, RTCP, RTP, H264, MP4 (FMP4)协议，RTSP + H264 + FMP4 + WebSocket + MSE + WEB; 5、基础字节数组解析转换工具;

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/*
 * MIT License
 *
 * Copyright (c) 2021-2099 Oscura (xingshuang) 
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.github.xingshuangs.iot.protocol.rtp.model.payload;


import com.github.xingshuangs.iot.common.buff.ByteReadBuff;
import com.github.xingshuangs.iot.common.buff.ByteWriteBuff;
import com.github.xingshuangs.iot.utils.IntegerUtil;

/**
 * @author xingshuang
 * 0                   1                   2                   3
 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                          RTP Header                           |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |MTAP24 NAL HDR |  decoding order number base   | NALU 1 Size   |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |  NALU 1 Size  |  NALU 1 DOND  |       NALU 1 TS offs          |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |NALU 1 TS offs |  NALU 1 HDR   |  NALU 1 DATA                  |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
 * :                                                               :
 * +               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |               | NALU 2 SIZE                   |  NALU 2 DOND  |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |       NALU 2 TS offset                        |  NALU 2 HDR   |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |  NALU 2 DATA                                                  |
 * :                                                               :
 * |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                               :...OPTIONAL RTP padding        |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 */
public class H264NaluMtap24Single extends H264NaluSingle {

    private int size;

    private int dond;

    private int tsOffset;

    @Override
    public int byteArrayLength() {
        return this.header.byteArrayLength() + 2 + this.payload.length;
    }

    @Override
    public byte[] toByteArray() {
        byte[] tsOffsetBytes = IntegerUtil.toCustomByteArray(this.tsOffset, 1, 3);
        return ByteWriteBuff.newInstance(this.byteArrayLength())
                .putShort(this.size)
                .putByte(this.dond)
                .putBytes(tsOffsetBytes)
                .putBytes(this.header.toByteArray())
                .putBytes(this.payload)
                .getData();
    }

    /**
     * Parses byte array and converts it to object.
     *
     * @param data byte array
     * @return RtcpHeader
     */
    public static H264NaluMtap24Single fromBytes(final byte[] data) {
        return fromBytes(data, 0);
    }

    /**
     * Parses byte array and converts it to object.
     *
     * @param data   byte array
     * @param offset index offset
     * @return RtcpHeader
     */
    public static H264NaluMtap24Single fromBytes(final byte[] data, final int offset) {
        if (data.length < 3) {
            throw new IndexOutOfBoundsException("H264NaluStapSingle, data length < 3");
        }
        int index = offset;
        ByteReadBuff buff = ByteReadBuff.newInstance(data, index);
        H264NaluMtap24Single res = new H264NaluMtap24Single();
        res.size = buff.getUInt16();
        res.dond = buff.getByteToInt();
        res.tsOffset = IntegerUtil.toInt32In3Bytes(buff.getBytes(3), 0);
        index += 6;

        res.header = H264NaluHeader.fromBytes(data, index);
        index += res.header.byteArrayLength();

        res.payload = ByteReadBuff.newInstance(data, index).getBytes(res.size);
        return res;
    }
}