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90 lines
2.9 KiB
90 lines
2.9 KiB
/**
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* Digital Voice Modem - Fixed Network Equipment
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* AGPLv3 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* @package DVM / Fixed Network Equipment
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*
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*/
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/*
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* Copyright (C) 2023 by Bryan Biedenkapp N2PLL
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*/
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using System;
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namespace fnecore
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{
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/// <summary>
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///
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/// </summary>
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public class RtpExtensionHeader
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{
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protected int offset = 0;
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protected ushort payloadLength;
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/// <summary>
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/// Format of the extension header payload contained within the packet.
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/// </summary>
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public ushort PayloadType { get; set; }
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/// <summary>
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/// Length of the extension header payload (in 32-bit units).
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/// </summary>
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public ushort PayloadLength { get => payloadLength; }
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/*
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** Methods
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*/
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/// <summary>
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/// Initializes a new instance of the <see cref="RtpExtensionHeader"/> class.
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/// </summary>
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/// <param name="offset"></param>
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public RtpExtensionHeader(int offset = 12) // 12 bytes is the length of the RTP Header
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{
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this.offset = offset;
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PayloadType = 0;
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payloadLength = 0;
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}
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/// <summary>
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/// Decode a RTP header.
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/// </summary>
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/// <param name="data"></param>
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public virtual bool Decode(byte[] data)
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{
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if (data == null)
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return false;
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PayloadType = (ushort)((data[0 + offset] << 8) | (data[1 + offset] << 0)); // Payload Type
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payloadLength = (ushort)((data[2 + offset] << 8) | (data[3 + offset] << 0)); // Payload Length
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return true;
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}
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/// <summary>
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/// Encode a RTP header.
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/// </summary>
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/// <param name="data"></param>
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public virtual void Encode(ref byte[] data)
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{
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if (data == null)
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return;
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data[0 + offset] = (byte)((PayloadType >> 8) & 0xFFU); // Payload Type MSB
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data[1 + offset] = (byte)((PayloadType >> 0) & 0xFFU); // Payload Type LSB
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data[2 + offset] = (byte)((payloadLength >> 8) & 0xFFU); // Payload Length MSB
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data[3 + offset] = (byte)((payloadLength >> 0) & 0xFFU); // Payload Length LSB
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}
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} // public class RtpExtensionHeader
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} // namespace fnecore
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