File size: 2,539 Bytes
a84fca7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | """Decode FBX animation curve values and compare two clips frame by frame.
Range or amplitude comparisons pair up motions that merely span the same
extents; matching the actual key values settles it.
"""
import os, struct, sys, zlib
SCALAR={"Y":2,"C":1,"I":4,"F":4,"D":8,"L":8}; ELEM={"f":4,"d":8,"l":8,"i":4,"b":1}
FMT={"f":"f","d":"d","l":"q","i":"i","b":"b"}
def curves(path):
d=open(path,'rb').read(); u64=struct.unpack("<I",d[23:27])[0]>=7500
N=25 if u64 else 13; out=[]
def rp(p,want):
t=chr(d[p]); s=p; p+=1
if t in SCALAR: p+=SCALAR[t]; return p,None
if t in ELEM:
n,enc,cl=struct.unpack("<III",d[p:p+12]); p+=12
body=cl if enc else n*ELEM[t]; raw=d[p:p+body]; p+=body
if want and n:
try:
if enc: raw=zlib.decompress(raw)
return p,struct.unpack("<%d%s"%(n,FMT[t]),raw[:n*ELEM[t]])
except Exception: return p,None
return p,None
if t in "SR":
ln=struct.unpack("<I",d[p:p+4])[0]; p+=4+ln; return p,None
raise ValueError
def rn(p):
if u64: e,np_,pl=struct.unpack("<QQQ",d[p:p+24]); q=p+24
else: e,np_,pl=struct.unpack("<III",d[p:p+12]); q=p+12
if e==0 and np_==0 and pl==0: return p+N
nl=d[q]; q+=1; nm=d[q:q+nl]; q+=nl; p=q; want=nm==b"KeyValueFloat"; v=None
for _ in range(np_):
p,x=rp(p,want)
if x is not None: v=x
if want and v: out.append(v)
while p<e:
if d[p:p+N]==b"\x00"*N: p+=N; break
p=rn(p)
return e
p=27
while p<len(d)-160:
if d[p:p+N]==b"\x00"*N: break
p=rn(p)
return out
def same_motion(a,b,eps=1e-4):
ca,cb=curves(a),curves(b)
ma=[c for c in ca if max(c)-min(c)>1e-6]; mb=[c for c in cb if max(c)-min(c)>1e-6]
if len(ma)!=len(mb): return False,"moving curves %d vs %d"%(len(ma),len(mb))
ka=sorted(ma,key=lambda c:(len(c),c[0])); kb=sorted(mb,key=lambda c:(len(c),c[0]))
matched=0
for x,y in zip(ka,kb):
n=min(len(x),len(y))
if n and all(abs(x[i]-y[i])<eps for i in range(n)): matched+=1
return matched==len(ka), "%d/%d curves identical frame by frame"%(matched,len(ka))
if __name__=="__main__":
for i in range(1,len(sys.argv),2):
a,b=sys.argv[i],sys.argv[i+1]
ok,msg=same_motion(a,b)
print(" %-26s vs %-26s %s (%s)"%(os.path.basename(a),os.path.basename(b),
"same motion" if ok else "different", msg))
|