read_yuv.py

# -*- coding: utf-8 -*-
"""
Created on Thu Jan 10 10:48:00 2013

@author: Chen Ming
"""

from numpy import *

screenLevels = 255.0


def yuv_import(filename,dims,numfrm,startfrm):
    fp=open(filename,'rb')
    blk_size = prod(dims) * 1
    fp.seek(blk_size*startfrm,0)
    Y=[]
    # U=[]
    # V=[]
    # print dims[0]
    # print dims[1]
    # d00=dims[0]//2
    # d01=dims[1]//2
    # print d00
    # print d01
    Yt=zeros((dims[0],dims[1]),uint8,'C')
    # Ut=zeros((d00,d01),uint8,'C')
    # Vt=zeros((d00,d01),uint8,'C')
    for i in range(numfrm):
        for m in range(dims[0]):
            for n in range(dims[1]):
                #print m,n
                Yt[m,n]=ord(fp.read(1))
        # for m in range(d00):
        #     for n in range(d01):
        #         Ut[m,n]=ord(fp.read(1))
        # for m in range(d00):
        #     for n in range(d01):
        #         Vt[m,n]=ord(fp.read(1))
        Y=Y+[Yt]
        # U=U+[Ut]
        # V=V+[Vt]
    fp.close()
    return Y

# def yuv_import(filename,dims,numfrm,startfrm):
#     fp=open(filename,'rb')
#     blk_size = prod(dims) *3/2
#     fp.seek(blk_size*startfrm,0)
#     Y=[]
#     # U=[]
#     # V=[]
#     # print dims[0]
#     # print dims[1]
#     d00=dims[0]//2
#     d01=dims[1]//2
#     # print d00
#     # print d01
#     Yt=zeros((dims[0],dims[1]),uint8,'C')
#     # Ut=zeros((d00,d01),uint8,'C')
#     # Vt=zeros((d00,d01),uint8,'C')
#     for i in range(numfrm):
#         for m in range(dims[0]):
#             for n in range(dims[1]):
#                 #print m,n
#                 Yt[m,n]=ord(fp.read(1))
#         # for m in range(d00):
#         #     for n in range(d01):
#         #         Ut[m,n]=ord(fp.read(1))
#         # for m in range(d00):
#         #     for n in range(d01):
#         #         Vt[m,n]=ord(fp.read(1))
#         Y=Y+[Yt]
#         # U=U+[Ut]
#         # V=V+[Vt]
#     fp.close()
#     return Y


# if __name__ == '__main__':
#     data=yuv_import('E:\\new\\test\\ballroom\\ballroom_0.yuv',(480,640),1,0)
#     #print data
#     #im=array2image(array(data[0][0]))
#     YY=data[0][0]
#     print YY.shape
#     for m in range(2):
#         print m,': ', YY[m,:]
#
#     im=Image.fromstring('L',(640,480),YY.tostring())
#     im.show()
#     im.save('f:\\a.jpg')