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Movie.py
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Sat, Sep 21, 18:47

Movie.py
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import string
from numpy import *
import Image
import ImageDraw
import ImageFont
import ImagePalette
import ImageFont
class Movie:
'''
a Movie class
'''
##########################
def __init__(self,name,mode=None):
##########################
self.name = name
self.mode = mode
self.starttime = 0.0
self.stoptime = 0.0
self.dt = 0.0
self.npic = 0
self.numByte = 0
self.numLine = 0
self.headerlength = 0
self.blocksize = 0
self.filmsize = 0
self.shape = (0,0)
self.current_npic = 0
# self.film
##########################
def open(self,mode='r',readall=0):
##########################
"""
open a file
"""
numByte = 256
# open the file
self.film = open(self.name, mode)
###############################################
# read the header and find numByte and numLine
###############################################
self.header = self.film.read(256)
if len(self.header) != 256:
raise "film length < 256, ,stop"
self.film.seek(240)
str1 = self.film.read(8)
str2 = self.film.read(8)
if (str1 !=" " and str2 !=" "):
self.numByte = string.atoi(str1)
self.numLine = string.atoi(str2)
else:
self.numByte = 256
self.numLine = 192
if self.mode == 'RGB':
self.numLine = self.numLine*3
if self.numByte < 256:
self.headerlength = 256
else:
self.headerlength = self.numByte
###############################################
# read the header and find numByte and numLine
###############################################
self.blocksize = self.numLine*self.numByte + self.headerlength
self.shape = (self.numByte,self.numLine)
#############################
# check film length
#############################
self.film.seek(0,2)
self.filmsize = self.film.tell()
self.film.seek(0)
fmod(self.filmsize,self.blocksize)
self.npic = self.filmsize/self.blocksize
#############################
# read times
#############################
self.film.seek(0)
self.starttime = float(self.film.read(self.headerlength)[:8])
self.film.seek(0)
self.moveto(self.npic)
self.stoptime = float(self.film.read(self.headerlength)[:8])
self.film.seek(0)
if self.npic > 1:
self.dt = (self.stoptime-self.starttime)/self.npic
else:
self.dt = 0
self.current_npic = 0
'''
#############################
# go to the top of the file
#############################
self.film.seek(0)
if readall:
# reading next label
time = self.film.read(self.headerlength)
if len(time) == self.headerlength:
# record starttime
self.starttime = string.atof(time[:8])
# reading next data
data = self.film.read(self.numByte*self.numLine)
if len(data) == self.numByte*self.numLine:
# add one pict
self.npic = self.npic + 1
#######################
# loop over all images
#######################
ok = 1
while ok:
ok = 0
# reading next label
time = self.film.read(self.headerlength)
if len(time) == self.headerlength:
# reading next data
data = self.film.read(self.numByte*self.numLine)
if len(data) == self.numByte*self.numLine:
ok = 1
self.npic = self.npic + 1
self.stoptime = string.atof(time[:8])
# go to the top of the file
self.film.seek(0)
if self.npic > 1:
self.dt = (self.stoptime-self.starttime)/(self.npic-1)
else:
self.dt = 0.
'''
##########################
def info(self):
##########################
"""
give info
"""
print '''
-- %s --
initial time : %8.3f
final time : %8.3f
dt : %8.3f
number of images : %d
number of collumns : %d
number of lines : %d
length of header : %d
length of block : %d
length of film : %d
current_npic : %d
''' % (self.name,self.starttime,self.stoptime,self.dt,self.npic,self.numByte,self.numLine,self.headerlength,self.blocksize,self.filmsize,self.current_npic)
##########################
def new(self,numByte,numLine):
##########################
self.numByte = numByte
self.numLine = numLine
if self.numByte < 256:
self.headerlength = 256
else:
self.headerlength = self.numByte
self.film = open(self.name, "w")
##########################
def close(self):
##########################
self.film.close()
##########################
def read_one(self,mode=None):
##########################
# reading next label
time = self.film.read(self.headerlength)
if len(time) == self.headerlength:
# record starttime
self.current_time = string.atof(time[:8])
# reading next data
data = self.film.read(self.numByte*self.numLine)
if len(data) == self.numByte*self.numLine:
self.current_image = data
if mode == "array":
return reshape(fromstring(data,uint8),(self.numLine,self.numByte))
elif mode == "image":
return Image.fromstring("P",shape,(self.numByte,self.numLine))
else:
return data
##########################
def read_one_with_time(self,mode=None):
##########################
# reading next label
time = self.film.read(self.headerlength)
if len(time) == self.headerlength:
# record starttime
self.current_time = string.atof(time[:8])
shape = (self.numByte,self.numLine)
if mode == "array":
data = self.film.read(self.numByte*self.numLine)
return time,reshape(fromstring(data,'b'),(self.numLine,self.numByte))
elif mode == "image":
data = self.film.read(self.numByte*self.numLine)
return time,Image.fromstring("P",shape,data)
elif mode == "image_rgb":
dataR = self.film.read(self.numByte*self.numLine)
self.film.read(self.headerlength)
dataG = self.film.read(self.numByte*self.numLine)
self.film.read(self.headerlength)
dataB = self.film.read(self.numByte*self.numLine)
imageR = Image.fromstring("L",shape,dataR)
imageG = Image.fromstring("L",shape,dataG)
imageB = Image.fromstring("L",shape,dataB)
return time,Image.merge('RGB',(imageR,imageG,imageB))
else:
data = self.film.read(self.numByte*self.numLine)
return time,data
else:
return None,None
##########################
def read(self,skip=0,mode='array'):
##########################
'''
skip = 0 : read image at the current position
skip = 1 : skip an image
skip = -1 : read the image before (go back)
skip = -2 : skip an image before (go back)
'''
# move relative to the current position
try:
self.film.seek(skip*self.blocksize,1)
except IOError:
self.moveto(0)
return -1,0,-1
self.current_npic = self.film.tell()/self.blocksize
if self.current_npic>self.npic-1:
self.moveto(self.npic)
return -2,self.current_npic,-2
# reading next label
time = self.film.read(self.headerlength)
# record starttime
self.current_time = string.atof(time[:8])
if mode == "array":
data = self.film.read(self.numByte*self.numLine)
return self.current_time,self.current_npic,transpose(reshape(fromstring(data,'b'),(self.numLine,self.numByte)))
elif mode == "image":
data = self.film.read(self.numByte*self.numLine)
return self.current_time,self.current_npic,Image.fromstring("P",self.shape,data)
elif mode == "image_rgb":
dataR = self.film.read(self.numByte*self.numLine)
self.film.read(self.headerlength)
dataG = self.film.read(self.numByte*self.numLine)
self.film.read(self.headerlength)
dataB = self.film.read(self.numByte*self.numLine)
imageR = Image.fromstring("L",self.shape,dataR)
imageG = Image.fromstring("L",self.shape,dataG)
imageB = Image.fromstring("L",self.shape,dataB)
return self.current_time,self.current_npic,Image.merge('RGB',(imageR,imageG,imageB))
else:
data = self.film.read(self.numByte*self.numLine)
return self.current_time,self.current_npic,data
##########################
def moveto(self,npic):
##########################
npic = min(npic,self.npic-1)
npic = max(npic,0)
current_npic = self.film.tell()/self.blocksize
dnpic = npic-current_npic
db = dnpic*self.blocksize
self.film.seek(db,1)
self.current_npic = self.film.tell()/self.blocksize
###########################
def write_pic(self,time,data):
###########################
import string
recsize = self.numByte
record = '%8.3f' % time
s1=string.ljust(record,240)
s2=string.ljust(`self.numByte`,8)
if self.mode == 'RGB':
s3=string.ljust(`self.numLine/3`,8)
else:
s3=string.ljust(`self.numLine`,8)
record = s1+s2+s3
record= string.ljust(record,recsize)
self.film.write(record)
self.film.write(data)
###########################
def write_pic_rgb(self,time,dataR,dataG,dataB):
###########################
import string
recsize = self.numByte
record = '%8.3f' % time
s1=string.ljust(record,240)
s2=string.ljust(`self.numByte`,8)
s3=string.ljust(`self.numLine`,8)
record = s1+s2+s3
record= string.ljust(record,recsize)
self.film.write(record)
self.film.write(dataR)
self.film.write(dataG)
self.film.write(dataB)
###########################
def get_img(self,data):
###########################
'''
can be replaced by read_one with option "image"
'''
shape = (self.numByte,self.numLine)
image = Image.fromstring("P",shape,data)
return image
###################################
def append_h(numByte,numLine,datas):
###################################
newdata = ''
# loop over the lines
for j in range(numLine):
j1 = j*numByte # set cursors
j2 = j1 + numByte
# loop over the images
for data in datas:
newdata = newdata + data[j1:j2] # simply sum
return newdata

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