8b98485d41
Also check for conversion errors, allow more types of files to be converted. Finally, use TryParse to avoid exceptions in converting from strings to numbers. git-svn-id: http://libopenmetaverse.googlecode.com/svn/trunk@470 52acb1d6-8a22-11de-b505-999d5b087335
686 lines
29 KiB
C#
686 lines
29 KiB
C#
/*
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* Copyright (c) 2006, Second Life Reverse Engineering Team
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* All rights reserved.
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*
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* - Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Neither the name of the Second Life Reverse Engineering Team nor the names
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* of its contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using libsecondlife.Packets;
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namespace libsecondlife
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{
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/// <summary>
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///
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/// </summary>
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/// <param name="simulator"></param>
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/// <param name="prim"></param>
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/// <param name="regionHandle"></param>
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/// <param name="timeDilation"></param>
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public delegate void NewPrimCallback(Simulator simulator, PrimObject prim, ulong regionHandle, ushort timeDilation);
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/// <summary>
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///
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/// </summary>
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/// <param name="simulator"></param>
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/// <param name="avatar"></param>
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/// <param name="regionHandle"></param>
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/// <param name="timeDilation"></param>
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public delegate void NewAvatarCallback(Simulator simulator, Avatar avatar, ulong regionHandle, ushort timeDilation);
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/// <summary>
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///
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/// </summary>
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/// <param name="simulator"></param>
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/// <param name="prim"></param>
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/// <param name="regionHandle"></param>
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/// <param name="timeDilation"></param>
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public delegate void PrimMovedCallback(Simulator simulator, PrimUpdate prim, ulong regionHandle, ushort timeDilation);
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/// <summary>
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///
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/// </summary>
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/// <param name="simulator"></param>
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/// <param name="avatar"></param>
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/// <param name="regionHandle"></param>
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/// <param name="timeDilation"></param>
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public delegate void AvatarMovedCallback(Simulator simulator, AvatarUpdate avatar, ulong regionHandle, ushort timeDilation);
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/// <summary>
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///
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/// </summary>
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/// <param name="simulator"></param>
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/// <param name="objectID"></param>
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public delegate void KillObjectCallback(Simulator simulator, uint objectID);
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public enum PCode
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{
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Prim = 9
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}
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/// <summary>
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/// Contains all of the variables sent in an object update packet for a
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/// prim object. Used to track position and movement of prims.
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/// </summary>
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public struct PrimUpdate
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{
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/// <summary></summary>
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public uint LocalID;
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/// <summary></summary>
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public byte State;
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/// <summary></summary>
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public LLVector3 Position;
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/// <summary></summary>
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public LLVector3 Velocity;
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/// <summary></summary>
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public LLVector3 Acceleration;
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/// <summary></summary>
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public LLQuaternion Rotation;
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/// <summary></summary>
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public LLVector3 RotationVelocity;
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}
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/// <summary>
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/// Contains all of the variables sent in an object update packet for an
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/// avatar. Used to track position and movement of avatars.
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/// </summary>
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public struct AvatarUpdate
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{
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/// <summary></summary>
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public uint LocalID;
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/// <summary></summary>
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public byte State;
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/// <summary></summary>
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public LLVector4 CollisionPlane;
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/// <summary></summary>
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public LLVector3 Position;
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/// <summary></summary>
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public LLVector3 Velocity;
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/// <summary></summary>
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public LLVector3 Acceleration;
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/// <summary></summary>
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public LLQuaternion Rotation;
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/// <summary></summary>
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public LLVector3 RotationVelocity;
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}
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/// <summary>
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/// Handles all network traffic related to prims and avatar positions and
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/// movement.
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/// </summary>
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public class ObjectManager
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{
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/// <summary>
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/// This event will be raised for every ObjectUpdate block that
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/// contains a new prim.
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/// <remarks>Depending on the circumstances a client could
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/// receive two or more of these events for the same object, if you
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/// or the object left the current sim and returned for example. Client
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/// applications are responsible for tracking and storing objects.
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/// </remarks>
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/// </summary>
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public event NewPrimCallback OnNewPrim;
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/// <summary>
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/// This event will be raised for every ObjectUpdate block that
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/// contains a new avatar.
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/// <remarks>Depending on the circumstances a client
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/// could receive two or more of these events for the same avatar, if
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/// you or the other avatar left the current sim and returned for
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/// example. Client applications are responsible for tracking and
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/// storing objects.</remarks>
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/// </summary>
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public event NewAvatarCallback OnNewAvatar;
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/// <summary>
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/// This event will be raised when a prim movement packet is received,
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/// containing the updated position, rotation, and movement-related
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/// vectors.
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/// </summary>
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public event PrimMovedCallback OnPrimMoved;
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/// <summary>
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/// This event will be raised when an avatar movement packet is
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/// received, containing the updated position, rotation, and
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/// movement-related vectors.
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/// </summary>
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public event AvatarMovedCallback OnAvatarMoved;
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/// <summary>
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/// This event will be raised when an object is removed from a
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/// simulator.
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/// </summary>
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public event KillObjectCallback OnObjectKilled;
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private SecondLife Client;
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/// <summary>
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///
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/// </summary>
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/// <param name="client"></param>
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public ObjectManager(SecondLife client)
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{
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Client = client;
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Client.Network.RegisterCallback(PacketType.ObjectUpdate, new PacketCallback(UpdateHandler));
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Client.Network.RegisterCallback(PacketType.ImprovedTerseObjectUpdate, new PacketCallback(TerseUpdateHandler));
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Client.Network.RegisterCallback(PacketType.ObjectUpdateCompressed, new PacketCallback(CompressedUpdateHandler));
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Client.Network.RegisterCallback(PacketType.ObjectUpdateCached, new PacketCallback(CachedUpdateHandler));
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Client.Network.RegisterCallback(PacketType.KillObject, new PacketCallback(KillObjectHandler));
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}
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public void RequestObject(Simulator simulator, uint localID)
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{
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RequestMultipleObjectsPacket request = new RequestMultipleObjectsPacket();
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request.AgentData.AgentID = Client.Network.AgentID;
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request.AgentData.SessionID = Client.Network.SessionID;
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request.ObjectData = new RequestMultipleObjectsPacket.ObjectDataBlock[1];
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request.ObjectData[0] = new RequestMultipleObjectsPacket.ObjectDataBlock();
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request.ObjectData[0].ID = localID;
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request.ObjectData[0].CacheMissType = 0;
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Client.Network.SendPacket(request, simulator);
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}
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public void RequestObjects(Simulator simulator, List<uint> localIDs)
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{
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int i = 0;
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RequestMultipleObjectsPacket request = new RequestMultipleObjectsPacket();
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request.AgentData.AgentID = Client.Network.AgentID;
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request.AgentData.SessionID = Client.Network.SessionID;
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request.ObjectData = new RequestMultipleObjectsPacket.ObjectDataBlock[localIDs.Count];
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foreach (uint localID in localIDs)
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{
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request.ObjectData[i] = new RequestMultipleObjectsPacket.ObjectDataBlock();
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request.ObjectData[i].ID = localID;
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request.ObjectData[i].CacheMissType = 0;
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i++;
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}
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Client.Network.SendPacket(request, simulator);
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}
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private void ParseAvName(string name, ref string firstName, ref string lastName, ref string groupName)
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{
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string[] lines = name.Split('\n');
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foreach (string line in lines)
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{
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if (line.Substring(0, 19) == "Title STRING RW SV ")
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{
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groupName = line.Substring(19);
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}
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else if (line.Substring(0, 23) == "FirstName STRING RW SV ")
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{
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firstName = line.Substring(23);
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}
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else if (line.Substring(0, 22) == "LastName STRING RW SV ")
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{
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lastName = line.Substring(22);
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}
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else
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{
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Client.Log("Unhandled line in an avatar name: " + line, Helpers.LogLevel.Warning);
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}
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}
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}
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private void UpdateHandler(Packet packet, Simulator simulator)
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{
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ObjectUpdatePacket update = (ObjectUpdatePacket)packet;
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foreach (ObjectUpdatePacket.ObjectDataBlock block in update.ObjectData)
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{
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if (block.ObjectData.Length == 60)
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{
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if (block.PCode == (byte)PCode.Prim)
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{
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// New prim spotted
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PrimObject prim = new PrimObject(Client);
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prim.Position = new LLVector3(block.ObjectData, 0);
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prim.Rotation = new LLQuaternion(block.ObjectData, 36, true);
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// TODO: Parse the rest of the ObjectData byte array fields
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prim.LocalID = block.ID;
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prim.State = block.State;
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prim.ID = block.FullID;
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prim.ParentID = block.ParentID;
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//block.OwnerID Sound-related
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prim.Material = block.Material;
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prim.PathCurve = block.PathCurve;
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prim.ProfileCurve = block.ProfileCurve;
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prim.PathBegin = PrimObject.PathBeginFloat(block.PathBegin);
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prim.PathEnd = PrimObject.PathEndFloat(block.PathEnd);
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prim.PathScaleX = PrimObject.PathScaleFloat(block.PathScaleX);
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prim.PathScaleY = PrimObject.PathScaleFloat(block.PathScaleY);
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prim.PathShearX = PrimObject.PathShearFloat(block.PathShearX);
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prim.PathShearY = PrimObject.PathShearFloat(block.PathShearY);
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prim.PathTwist = block.PathTwist; //PrimObject.PathTwistFloat(block.PathTwist);
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prim.PathTwistBegin = block.PathTwistBegin; //PrimObject.PathTwistFloat(block.PathTwistBegin);
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prim.PathRadiusOffset = PrimObject.PathRadiusOffsetFloat(block.PathRadiusOffset);
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prim.PathTaperX = PrimObject.PathTaperFloat((byte)block.PathTaperX);
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prim.PathTaperY = PrimObject.PathTaperFloat((byte)block.PathTaperY);
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prim.PathRevolutions = PrimObject.PathRevolutionsFloat(block.PathRevolutions);
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prim.PathSkew = PrimObject.PathSkewFloat((byte)block.PathSkew);
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prim.ProfileBegin = PrimObject.ProfileBeginFloat(block.ProfileBegin);
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prim.ProfileEnd = PrimObject.ProfileEndFloat(block.ProfileEnd);
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prim.ProfileHollow = block.ProfileHollow;
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prim.Name = Helpers.FieldToString(block.NameValue);
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//block.Data ?
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//block.Text Hovering text
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//block.TextColor LLColor4U of the hovering text
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//block.MediaURL Quicktime stream
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prim.Textures = new TextureEntry(block.TextureEntry, 0, block.TextureEntry.Length);
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prim.TextureAnim = new TextureAnimation(block.TextureAnim, 0);
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//block.JointType ?
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//block.JointPivot ?
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//block.JointAxisOrAnchor ?
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prim.ParticleSys = new ParticleSystem(block.PSBlock, 0);
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prim.SetExtraParamsFromBytes(block.ExtraParams, 0);
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prim.Scale = block.Scale;
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//block.Flags ?
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//block.UpdateFlags ?
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//block.ClickAction ?
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//block.Gain Sound-related
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//block.Sound Sound-related
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//block.Radius Sound-related
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if (OnNewPrim != null)
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{
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OnNewPrim(simulator, prim, update.RegionData.RegionHandle, update.RegionData.TimeDilation);
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}
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}
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else
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{
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// FIXME: This is probably a tree/bush/grasspatch, which need their own
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// separate callback IMO -jph
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Client.Log("Got an ObjectUpdate block with an unhandled PCode " +
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block.PCode, Helpers.LogLevel.Debug);
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}
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}
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else if (block.ObjectData.Length == 76)
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{
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Avatar avatar = new Avatar();
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string FirstName = "";
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string LastName = "";
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string GroupName = "";
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//avatar.CollisionPlane = new LLQuaternion(block.ObjectData, 0);
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avatar.Position = new LLVector3(block.ObjectData, 16);
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avatar.Rotation = new LLQuaternion(block.ObjectData, 52, true);
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// TODO: Parse the rest of the ObjectData byte array fields
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ParseAvName(Helpers.FieldToString(block.NameValue), ref FirstName, ref LastName, ref GroupName);
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avatar.ID = block.FullID;
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avatar.LocalID = block.ID;
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avatar.Name = FirstName + " " + LastName;
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avatar.GroupName = GroupName;
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avatar.Online = true;
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avatar.CurrentRegion = simulator.Region;
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avatar.Textures = new TextureEntry(block.TextureEntry, 0, block.TextureEntry.Length);
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if (FirstName == Client.Self.FirstName && LastName == Client.Self.LastName)
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{
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// Update our avatar
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Client.Self.LocalID = avatar.LocalID;
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Client.Self.Position = avatar.Position;
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Client.Self.Rotation = avatar.Rotation;
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}
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else
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{
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Client.Avatars.AddAvatar(avatar);
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if (OnNewAvatar != null)
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{
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OnNewAvatar(simulator, avatar, update.RegionData.RegionHandle, update.RegionData.TimeDilation);
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}
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}
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}
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else
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{
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// Unknown
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Client.Log("Unhandled ObjectData.ObjectData length:\n" + block.ObjectData.Length,
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Helpers.LogLevel.Warning);
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}
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}
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}
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private void TerseUpdateHandler(Packet packet, Simulator simulator)
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{
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float x, y, z, w;
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uint localid;
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LLVector4 CollisionPlane = null;
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LLVector3 Position;
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LLVector3 Velocity;
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LLVector3 Acceleration;
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LLQuaternion Rotation;
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LLVector3 RotationVelocity;
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ImprovedTerseObjectUpdatePacket update = (ImprovedTerseObjectUpdatePacket)packet;
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foreach (ImprovedTerseObjectUpdatePacket.ObjectDataBlock block in update.ObjectData)
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{
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int i = 0;
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bool avatar;
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localid = (uint)(block.Data[i++] + (block.Data[i++] << 8) +
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(block.Data[i++] << 16) + (block.Data[i++] << 24));
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byte state = block.Data[i++];
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avatar = Convert.ToBoolean(block.Data[i++]);
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if (avatar)
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{
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CollisionPlane = new LLVector4(block.Data, i);
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i += 16;
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}
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// Position
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Position = new LLVector3(block.Data, i);
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i += 12;
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// Velocity
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x = Dequantize(block.Data, i, -128.0F, 128.0F);
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i += 2;
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y = Dequantize(block.Data, i, -128.0F, 128.0F);
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i += 2;
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z = Dequantize(block.Data, i, -128.0F, 128.0F);
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i += 2;
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Velocity = new LLVector3(x, y, z);
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// Acceleration
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x = Dequantize(block.Data, i, -64.0F, 64.0F);
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i += 2;
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y = Dequantize(block.Data, i, -64.0F, 64.0F);
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i += 2;
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z = Dequantize(block.Data, i, -64.0F, 64.0F);
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i += 2;
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Acceleration = new LLVector3(x, y, z);
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// Rotation
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x = Dequantize(block.Data, i, -1.0F, 1.0F);
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i += 2;
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y = Dequantize(block.Data, i, -1.0F, 1.0F);
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i += 2;
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z = Dequantize(block.Data, i, -1.0F, 1.0F);
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i += 2;
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w = Dequantize(block.Data, i, -1.0F, 1.0F);
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i += 2;
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Rotation = new LLQuaternion(x, y, z, w);
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// Rotation velocity
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x = Dequantize(block.Data, i, -64.0F, 64.0F);
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i += 2;
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y = Dequantize(block.Data, i, -64.0F, 64.0F);
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i += 2;
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z = Dequantize(block.Data, i, -64.0F, 64.0F);
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i += 2;
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RotationVelocity = new LLVector3(x, y, z);
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if (avatar)
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{
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if (localid == Client.Self.LocalID)
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{
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Client.Self.Position = Position;
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Client.Self.Rotation = Rotation;
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}
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AvatarUpdate avupdate = new AvatarUpdate();
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avupdate.LocalID = localid;
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avupdate.State = state;
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avupdate.Position = Position;
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avupdate.CollisionPlane = CollisionPlane;
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avupdate.Velocity = Velocity;
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avupdate.Acceleration = Acceleration;
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avupdate.Rotation = Rotation;
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avupdate.RotationVelocity = RotationVelocity;
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if (OnAvatarMoved != null)
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{
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OnAvatarMoved(simulator, avupdate, update.RegionData.RegionHandle, update.RegionData.TimeDilation);
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}
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}
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else
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{
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// TODO: Is there an easy way to distinguish prims from trees in this packet,
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// or would the client have to do it's own lookup to determine whether it's a
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// prim or a tree? If the latter, we should rename this update to something
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// less prim specific
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PrimUpdate primupdate = new PrimUpdate();
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primupdate.LocalID = localid;
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primupdate.State = state;
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primupdate.Position = Position;
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primupdate.Velocity = Velocity;
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primupdate.Acceleration = Acceleration;
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primupdate.Rotation = Rotation;
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primupdate.RotationVelocity = RotationVelocity;
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if (OnPrimMoved != null)
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{
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OnPrimMoved(simulator, primupdate, update.RegionData.RegionHandle, update.RegionData.TimeDilation);
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}
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}
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}
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}
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private void CompressedUpdateHandler(Packet packet, Simulator simulator)
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{
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return;
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ObjectUpdateCompressedPacket update = (ObjectUpdateCompressedPacket)packet;
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PrimObject prim;
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foreach (ObjectUpdateCompressedPacket.ObjectDataBlock block in update.ObjectData)
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{
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int i = 0;
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prim = new PrimObject(Client);
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try
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{
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prim.ID = new LLUUID(block.Data, 0);
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i += 16;
|
|
prim.LocalID = (uint)(block.Data[i++] + (block.Data[i++] << 8) +
|
|
(block.Data[i++] << 16) + (block.Data[i++] << 24));
|
|
|
|
byte pcode = block.Data[i++];
|
|
|
|
if (pcode != (byte)PCode.Prim)
|
|
{
|
|
Client.Log("Got an ObjectUpdateCompressed block with unhandled PCode " +
|
|
pcode, Helpers.LogLevel.Debug);
|
|
continue;
|
|
}
|
|
|
|
prim.State = (uint)block.Data[i++];
|
|
i += 4; //CRC
|
|
prim.Material = (uint)block.Data[i++];
|
|
i++; //ClickAction
|
|
|
|
prim.Scale = new LLVector3(block.Data, i);
|
|
i += 12;
|
|
prim.Position = new LLVector3(block.Data, i);
|
|
i += 12;
|
|
prim.Rotation = new LLQuaternion(block.Data, i, true);
|
|
i += 12;
|
|
|
|
uint flags = (uint)(block.Data[i++] + (block.Data[i++] << 8) +
|
|
(block.Data[i++] << 16) + (block.Data[i++] << 24));
|
|
|
|
if ((flags & 0x02) != 0)
|
|
{
|
|
//Unknown 2 bytes
|
|
i += 2;
|
|
|
|
if (OnNewPrim != null)
|
|
{
|
|
OnNewPrim(simulator, prim, update.RegionData.RegionHandle, update.RegionData.TimeDilation);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if ((flags & 0x20) != 0)
|
|
{
|
|
prim.ParentID = (uint)(block.Data[i++] + (block.Data[i++] << 8) +
|
|
(block.Data[i++] << 16) + (block.Data[i++] << 24));
|
|
}
|
|
else
|
|
{
|
|
prim.ParentID = 0;
|
|
}
|
|
|
|
//Unknown field
|
|
if ((flags & 0x80) != 0)
|
|
{
|
|
i += 12;
|
|
}
|
|
|
|
if ((flags & 0x08) != 0)
|
|
{
|
|
prim.ParticleSys = new ParticleSystem(block.Data, i);
|
|
i += 86;
|
|
}
|
|
|
|
if ((flags & 0x04) != 0)
|
|
{
|
|
string text = "";
|
|
while (block.Data[i] != 0)
|
|
{
|
|
text += (char)block.Data[i];
|
|
i++;
|
|
}
|
|
prim.Text = text;
|
|
i++;
|
|
|
|
//Unknown field, possibly text color.
|
|
i += 4;
|
|
}
|
|
|
|
i += prim.SetExtraParamsFromBytes(block.Data, i);
|
|
|
|
//Indicates that this is an attachment?
|
|
if ((flags & 0x100) != 0)
|
|
{
|
|
//A string
|
|
//Example: "AttachItemID STRING RW SV fa9a5ab8-1bad-b449-9873-cf5b803e664e"
|
|
while (block.Data[i] != 0)
|
|
{
|
|
i++;
|
|
}
|
|
i++;
|
|
}
|
|
|
|
prim.PathCurve = (uint)block.Data[i++];
|
|
prim.PathBegin = PrimObject.PathBeginFloat(block.Data[i++]);
|
|
prim.PathEnd = PrimObject.PathEndFloat(block.Data[i++]);
|
|
prim.PathScaleX = PrimObject.PathScaleFloat(block.Data[i++]);
|
|
prim.PathScaleY = PrimObject.PathScaleFloat(block.Data[i++]);
|
|
prim.PathShearX = PrimObject.PathShearFloat(block.Data[i++]);
|
|
prim.PathShearY = PrimObject.PathShearFloat(block.Data[i++]);
|
|
prim.PathTwist = (int)block.Data[i++];
|
|
prim.PathTwistBegin = (int)block.Data[i++];
|
|
prim.PathRadiusOffset = PrimObject.PathRadiusOffsetFloat((sbyte)block.Data[i++]);
|
|
prim.PathTaperX = PrimObject.PathTaperFloat(block.Data[i++]);
|
|
prim.PathTaperY = PrimObject.PathTaperFloat(block.Data[i++]);
|
|
prim.PathRevolutions = PrimObject.PathRevolutionsFloat(block.Data[i++]);
|
|
prim.PathSkew = PrimObject.PathSkewFloat(block.Data[i++]);
|
|
|
|
prim.ProfileCurve = (uint)block.Data[i++];
|
|
prim.ProfileBegin = PrimObject.ProfileBeginFloat(block.Data[i++]);
|
|
prim.ProfileEnd = PrimObject.ProfileEndFloat(block.Data[i++]);
|
|
prim.ProfileHollow = (uint)block.Data[i++];
|
|
|
|
int textureEntryLength = (int)(block.Data[i++] + (block.Data[i++] << 8) +
|
|
(block.Data[i++] << 16) + (block.Data[i++] << 24));
|
|
|
|
prim.Textures = new TextureEntry(block.Data, i, textureEntryLength);
|
|
|
|
i += textureEntryLength;
|
|
|
|
if (i < block.Data.Length)
|
|
{
|
|
int textureAnimLength = (int)(block.Data[i++] + (block.Data[i++] << 8) +
|
|
(block.Data[i++] << 16) + (block.Data[i++] << 24));
|
|
|
|
prim.TextureAnim = new TextureAnimation(block.Data, i);
|
|
}
|
|
}
|
|
catch (System.IndexOutOfRangeException e)
|
|
{
|
|
Client.Log("Had a problem decoding an ObjectUpdateCompressed packet: " +
|
|
e.ToString(), Helpers.LogLevel.Warning);
|
|
Client.Log(block.ToString(), Helpers.LogLevel.Warning);
|
|
}
|
|
|
|
|
|
if (OnNewPrim != null)
|
|
{
|
|
OnNewPrim(simulator, prim, update.RegionData.RegionHandle, update.RegionData.TimeDilation);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void CachedUpdateHandler(Packet packet, Simulator simulator)
|
|
{
|
|
List<uint> ids = new List<uint>();
|
|
ObjectUpdateCachedPacket update = (ObjectUpdateCachedPacket)packet;
|
|
|
|
// Assume clients aren't caching objects for now, so request updates for all of these objects
|
|
foreach (ObjectUpdateCachedPacket.ObjectDataBlock block in update.ObjectData)
|
|
{
|
|
ids.Add(block.ID);
|
|
}
|
|
|
|
RequestObjects(simulator, ids);
|
|
}
|
|
|
|
private void KillObjectHandler(Packet packet, Simulator simulator)
|
|
{
|
|
if (OnObjectKilled != null)
|
|
{
|
|
foreach (KillObjectPacket.ObjectDataBlock block in ((KillObjectPacket)packet).ObjectData)
|
|
{
|
|
OnObjectKilled(simulator, block.ID);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Takes a quantized 16-bit value from a byte array and its range and returns
|
|
/// a float representation of the continuous value. For example, a value of
|
|
/// 32767 and a range of -128.0 to 128.0 would return 0.0. The endian conversion
|
|
/// from the 16-bit little endian to the native platform will also be handled.
|
|
/// </summary>
|
|
/// <param name="byteArray">The byte array containing the short value</param>
|
|
/// <param name="pos">The beginning position of the short (quantized) value</param>
|
|
/// <param name="lower">The lower quantization range</param>
|
|
/// <param name="upper">The upper quantization range</param>
|
|
/// <returns>A 32-bit floating point representation of the dequantized value</returns>
|
|
private float Dequantize(byte[] byteArray, int pos, float lower, float upper)
|
|
{
|
|
ushort value = (ushort)(byteArray[pos] + (byteArray[pos + 1] << 8));
|
|
float QV = (float)value;
|
|
float range = upper - lower;
|
|
float QF = range / 65536.0F;
|
|
return (float)((QV * QF - (0.5F * range)) + QF);
|
|
}
|
|
}
|
|
}
|