List virtual and physical channel numbers found by HDHomeRun

chanmap.py

#!/usr/bin/env python

""" List virtual and physical channel numbers found by HDHomeRun """

import json
try:
    from urllib import request as r  # Python 3
except:
    import urllib as r               # Python 2

ADDR = '192.168.1.80'                # HDHomeRun IP
TEMP = 'http://%s/lineup.json?show=all&tuning'

# MHz to channel numbers 2-51

FREQS = {
    # low VHF
     57:  2,  63:  3,  69:  4,  79:  5,  85:  6,

    # high VHF
    177:  7, 183:  8, 189:  9, 195: 10, 201: 11, 207: 12, 213: 13,

    # core UHF
    473: 14, 479: 15, 485: 16, 491: 17, 503: 19, 509: 20, 515: 21,
    521: 22, 527: 23, 533: 24, 539: 25, 545: 26, 551: 27, 557: 28,
    563: 29, 569: 30, 575: 31, 581: 32, 587: 33, 593: 34, 599: 35,
    605: 36,

    # reserved
    611: 37,

    # shared with cell
    617: 38, 623: 39, 629: 40, 635: 41, 641: 42, 647: 43, 653: 44, 
    659: 45, 665: 46, 671: 47, 677: 48, 683: 49, 689: 50, 695: 51
}

def getf(num):
    return FREQS.get(num // 1000000, num)

def getn(item, name):
    return ['', name][item.get(name, 0)]

raw = r.urlopen(TEMP % ADDR).read()
data = json.loads(raw)

# Physical number, virtual number, name, codecs, flags

output = ['%2d.%04d %5s %-7.7s %-5.5s %-3.3s %-2.2s %s' % (
          getf(item.get('Frequency', 0)), item.get('ProgramNumber', 0),
          item.get('GuideNumber', ''), item.get('GuideName', ''),
          item.get('VideoCodec', ''), item.get('AudioCodec', ''),
          getn(item, 'HD'), getn(item, 'ATSC3')
          ) for item in data]

# HDHR reports in virtual channel order, but I want physical order

output.sort()

for item in output:
    print(item)