Port of raw2gmv.c to Python

raw2gmv.py

# //====================================================
# // raw2gmv 1.0a - raw to geekmaster video transcoder
# // Copyright (C) 2012 by geekmaster, with MIT license:
# // http://www.opensource.org/licenses/mit-license.php
# //----------------------------------------------------
##include <stdio.h>  // stdin,stdout
# typedef unsigned char u8; typedef unsigned int u32;
# int main(void) {
    # u8 o,to,tb,wb0[800*600]; u32 x,y,xi,yi,c=250,b=120; // c=contrast, b=brightness
    # while (fread(wb0,800*600,1,stdin)) for (y=0;y<800;y++) { xi=y; tb=0;
        # for (x=0;x<600;x++) { yi=599-x; o=x^y;
            # to=(y>>2&1|o>>1&2|y<<1&4|o<<2&8|y<<4&16|o<<5&32)-(wb0[yi*800+xi]*63+b)/c>>8;
            # tb=(tb>>1)|(to&128); if (7==(x&7)) { fwrite(&tb,1,1,stdout); tb=0; }
        # }
    # } return 0;
# }  

#It should be easy to convert this from C to Python.
#This version may already work. (Unlikely)

import sys

def main():
    c = 250
    b = 120
    #read 800x600 bytes from stdin
    wb0 = sys.stdin.buffer.read(800*600)
    while wb0:
        for y in range(800):
            xi = y
            tb = 0
            for x in range(600):
                yi = 599 - x
                o = x ^ y
                # change the following from C to Python
                to = (y>>2&1|o>>1&2|y<<1&4|o<<2&8|y<<4&16|o<<5&32)-(wb0[yi*800+xi]*63+b)/c>>8
                tb = (tb>>1)|(to&128)
                if (7==(x&7)):
                    sys.stdout.buffer.write(tb)
                    tb = 0
        wb0 = sys.stdin.buffer.read(800*600)
    return 0