Bvh.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
namespace UniHumanoid
{
public class BvhException : Exception
{
public BvhException(string msg) : base(msg) { }
}
public enum Channel
{
Xposition,
Yposition,
Zposition,
Xrotation,
Yrotation,
Zrotation,
}
public static class ChannelExtensions
{
public static string ToProperty(this Channel ch)
{
switch (ch)
{
case Channel.Xposition: return "localPosition.x";
case Channel.Yposition: return "localPosition.y";
case Channel.Zposition: return "localPosition.z";
case Channel.Xrotation: return "localEulerAnglesBaked.x";
case Channel.Yrotation: return "localEulerAnglesBaked.y";
case Channel.Zrotation: return "localEulerAnglesBaked.z";
}
throw new BvhException("no property for " + ch);
}
public static bool IsLocation(this Channel ch)
{
switch (ch)
{
case Channel.Xposition:
case Channel.Yposition:
case Channel.Zposition: return true;
case Channel.Xrotation:
case Channel.Yrotation:
case Channel.Zrotation: return false;
}
throw new BvhException("no property for " + ch);
}
}
public struct Single3
{
public Single x;
public Single y;
public Single z;
public Single3(Single _x, Single _y, Single _z)
{
x = _x;
y = _y;
z = _z;
}
}
public class BvhNode
{
public String Name
{
get;
private set;
}
public Single3 Offset
{
get;
private set;
}
public Channel[] Channels
{
get;
private set;
}
public List<BvhNode> Children
{
get;
private set;
}
public BvhNode(string name)
{
Name = name;
Children = new List<BvhNode>();
}
public virtual void Parse(StringReader r)
{
Offset = ParseOffset(r.ReadLine());
Channels = ParseChannel(r.ReadLine());
}
static Single3 ParseOffset(string line)
{
var splited = line.Trim().Split();
if (splited[0] != "OFFSET")
{
throw new BvhException("OFFSET is not found");
}
var offset = splited.Skip(1).Where(x => !string.IsNullOrEmpty(x)).Select(x => float.Parse(x)).ToArray();
return new Single3(offset[0], offset[1], offset[2]);
}
static Channel[] ParseChannel(string line)
{
var splited = line.Trim().Split();
if (splited[0] != "CHANNELS")
{
throw new BvhException("CHANNELS is not found");
}
var count = int.Parse(splited[1]);
if (count + 2 != splited.Length)
{
throw new BvhException("channel count is not match with splited count");
}
return splited.Skip(2).Select(x => (Channel)Enum.Parse(typeof(Channel), x)).ToArray();
}
public IEnumerable<BvhNode> Traverse()
{
yield return this;
foreach (var child in Children)
{
foreach (var descentant in child.Traverse())
{
yield return descentant;
}
}
}
}
public class EndSite : BvhNode
{
public EndSite(): base("")
{
}
public override void Parse(StringReader r)
{
r.ReadLine(); // offset
}
}
public class ChannelCurve
{
public float[] Keys
{
get;
private set;
}
public ChannelCurve(int frameCount)
{
Keys = new float[frameCount];
}
public void SetKey(int frame, float value)
{
Keys[frame] = value;
}
}
public class Bvh
{
public BvhNode Root
{
get;
private set;
}
public TimeSpan FrameTime
{
get;
private set;
}
public ChannelCurve[] Channels
{
get;
private set;
}
int m_frames;
public int FrameCount
{
get { return m_frames; }
}
public struct PathWithProperty
{
public string Path;
public string Property;
public bool IsLocation;
}
public bool TryGetPathWithPropertyFromChannel(ChannelCurve channel, out PathWithProperty pathWithProp)
{
var index = Channels.ToList().IndexOf(channel);
if (index == -1)
{
pathWithProp = default(PathWithProperty);
return false;
}
foreach(var node in Root.Traverse())
{
for(int i=0; i<node.Channels.Length; ++i, --index)
{
if (index == 0)
{
pathWithProp = new PathWithProperty
{
Path=GetPath(node),
Property=node.Channels[i].ToProperty(),
IsLocation=node.Channels[i].IsLocation(),
};
return true;
}
}
}
throw new BvhException("channel is not found");
}
public string GetPath(BvhNode node)
{
var list = new List<string>() { node.Name };
var current = node;
while (current!=null)
{
current = GetParent(current);
if (current != null)
{
list.Insert(0, current.Name);
}
}
return String.Join("/", list.ToArray());
}
BvhNode GetParent(BvhNode node)
{
foreach(var x in Root.Traverse())
{
if (x.Children.Contains(node))
{
return x;
}
}
return null;
}
public ChannelCurve GetChannel(BvhNode target, Channel channel)
{
var index = 0;
foreach (var node in Root.Traverse())
{
for (int i = 0; i < node.Channels.Length; ++i, ++index)
{
if(node==target && node.Channels[i] == channel)
{
return Channels[index];
}
}
}
throw new BvhException("channel is not found");
}
public override string ToString()
{
return string.Format("{0}nodes, {1}channels, {2}frames, {3:0.00}seconds"
, Root.Traverse().Count()
, Channels.Length
, m_frames
, m_frames * FrameTime.TotalSeconds);
}
public Bvh(BvhNode root, int frames, float seconds)
{
Root = root;
FrameTime = TimeSpan.FromSeconds(seconds);
m_frames = frames;
var channelCount = Root.Traverse()
.Where(x => x.Channels!=null)
.Select(x => x.Channels.Length)
.Sum();
Channels = Enumerable.Range(0, channelCount)
.Select(x => new ChannelCurve(frames))
.ToArray()
;
}
public void ParseFrame(int frame, string line)
{
var splited = line.Trim().Split().Where(x => !string.IsNullOrEmpty(x)).ToArray();
if (splited.Length != Channels.Length)
{
throw new BvhException("frame key count is not match channel count");
}
for(int i=0; i<Channels.Length; ++i)
{
Channels[i].SetKey(frame, float.Parse(splited[i]));
}
}
public static Bvh Parse(string src)
{
using (var r = new StringReader(src))
{
if (r.ReadLine() != "HIERARCHY")
{
throw new BvhException("not start with HIERARCHY");
}
var root = ParseNode(r);
if (root == null)
{
return null;
}
var frames = 0;
var frameTime = 0.0f;
if (r.ReadLine() == "MOTION")
{
var frameSplited = r.ReadLine().Split(':');
if (frameSplited[0] != "Frames")
{
throw new BvhException("Frames is not found");
}
frames = int.Parse(frameSplited[1]);
var frameTimeSplited = r.ReadLine().Split(':');
if (frameTimeSplited[0] != "Frame Time")
{
throw new BvhException("Frame Time is not found");
}
frameTime = float.Parse(frameTimeSplited[1]);
}
var bvh = new Bvh(root, frames, frameTime);
for(int i=0; i<frames; ++i)
{
var line = r.ReadLine();
bvh.ParseFrame(i, line);
}
return bvh;
}
}
static BvhNode ParseNode(StringReader r, int level = 0)
{
var firstline = r.ReadLine().Trim();
var splited = firstline.Split();
if (splited.Length != 2)
{
if (splited.Length == 1)
{
if(splited[0] == "}")
{
return null;
}
}
throw new BvhException(String.Format("splited to {0}({1})", splited.Length, firstline));
}
BvhNode node = null;
if (splited[0] == "ROOT")
{
if (level != 0)
{
throw new BvhException("nested ROOT");
}
node = new BvhNode(splited[1]);
}
else if (splited[0] == "JOINT")
{
if (level == 0)
{
throw new BvhException("should ROOT, but JOINT");
}
node = new BvhNode(splited[1]);
}
else if (splited[0] == "End")
{
if (level == 0)
{
throw new BvhException("End in level 0");
}
node = new EndSite();
}
else
{
throw new BvhException("unknown type: " + splited[0]);
}
if(r.ReadLine().Trim() != "{")
{
throw new BvhException("'{' is not found");
}
node.Parse(r);
// child nodes
while (true)
{
var child = ParseNode(r, level + 1);
if (child == null)
{
break;
}
if(!(child is EndSite))
{
node.Children.Add(child);
}
}
return node;
}
}
}