#!/usr/bin/env python3

# Note: this utility can run under python2.7 or python3

program = 'vdifbstate'
author  = 'Walter Brisken'
version = '0.6'
verdate = '20230106'

from os import system
from sys import exit, argv

def printVersion():
	print('%s ver. %s  %s  %s' % (program, version, author, verdate))

def usage():
	print('')
	printVersion()
	print('')
	print('A VDIF state counter for multi-thread VDIF data.  Uses vmux')
	print('and m5bstate to do the heavy lifting.\n')
	print('Usage : %s <infile> <frame size> <data rate> <threadlist> <nframes> [<offset> [{E|O}] ]\n' % program)
	print('  <infile> is the name of the VDIF file\n')
	print('  <frame size> is the size of each input VDIF frame, inc. header (e.g., 5032)\n')
	print('  <data rate> is the stream data rate (Mbps)\n')
	print('  <nframes> is the number of frames to bstate-erize\n')
	print('  <offset> is number of bytes into file to start decoding\n')
	print('  E: Putting an E after the offset parameter causes the program to consider even samples (starting with 0)')
	print('  O: Putting an O after the offset parameter causes the program to consider odd samples (starting with 0)\n')
	print('Note: Only works on 2-bit (real or complex) data for now...\n')


if '--version' in argv:
	printVersion()
	exit()

if len(argv) < 6:
	usage()
	exit()

infile = argv[1]
framesize = int(argv[2])
datarate = int(argv[3])
threadlist = argv[4]
nt = len(threadlist.split(','))
nframes = int(argv[5])
if len(argv) > 6:
	offset = int(argv[6])
else:
	offset = 0
if len(argv) > 7:
	if argv[7].upper() in ['E', 'O']:
		eo = argv[7].upper()
	else:
		usage()
		exit()
else:
	eo = ''

nc = 1
while(nc < nt):
	nc *= 2

outputpayload = nc*(framesize-32)
framespersecond = (datarate*1000000)//(nt*(framesize-32)*8)
outputdatarate = outputpayload*framespersecond*8//1000000

cmd = 'vmux %s %d %d %s - %d | m5bstate - VDIF_%d-%d-%d-2 %d %d %s' % (infile, framesize, framespersecond, threadlist, offset, outputpayload, outputdatarate, nc, nframes, 0, eo) 

print('Executing: %s' % cmd)
system(cmd)