164 lines
5.6 KiB
Python
Executable File
164 lines
5.6 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# This work is licensed under the Creative Attribution-NonCommercial-ShareAlike
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# 3.0 Unported License.To view a copy of this license, visit
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# http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to
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# Creative Commons, 444 Castro Street, Suite 900, Mountain View,
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# California, 94041, USA.
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from __future__ import print_function
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from bitarray import bitarray
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import bptc19696
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import constants
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# Does anybody read this stuff? There's a PEP somewhere that says I should do this.
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__author__ = 'Cortney T. Buffington, N0MJS'
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__copyright__ = 'Copyright (c) 2016 Cortney T. Buffington, N0MJS and the K0USY Group'
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__credits__ = 'Jonathan Naylor, G4KLX; Ian Wraith'
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__license__ = 'Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported'
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__maintainer__ = 'Cort Buffington, N0MJS'
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__email__ = 'n0mjs@me.com'
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def to_bits(_string):
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_bits = bitarray(endian='big')
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_bits.frombytes(_string)
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return _bits
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# Returns useable LC data - 9 bytes info + 3 bytes RS(12,9) ECC
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def lc_data_12(_data):
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return _data[4:12]+_data[16:27]+_data[31:42]+_data[46:57]+_data[61:72]+_data[76:87]+_data[91:102]+_data[106:117]+_data[121:132]
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# Returns useable LC data - 9 bytes info, no ECC
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def lc_data_9(_data):
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return _data[4:12]+_data[16:27]+_data[31:42]+_data[46:57]+_data[61:72]+_data[76:87]+_data[91:100]
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def voice_head_term(_string):
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burst = to_bits(_string)
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info = burst[0:98] + burst[166:264]
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de_int_info = bptc19696.deinterleave(info)
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slot_type = burst[98:108] + burst[156:166]
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sync = burst[108:156]
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if sync.tobytes() == constants.BS_DATA_SYNC:
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sync = True
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else:
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sync = False
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lc = to_bytes(lc_data_9(de_int_info))
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cc = to_bytes(slot_type[0:4])
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dtype = to_bytes(slot_type[4:8])
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return (lc, cc, dtype, sync)
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def voice_burst(_string):
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burst = to_bits(_string)
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voice = burst[0:108] + burst[156:264]
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sync = burst [108:156]
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if sync.tobytes() == constants.BS_VOICE_SYNC:
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cc = '\x00'
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lcss = '\x00'
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sync = True
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else:
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emb = burst[108:116] + burst[148:156]
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embeded = burst[116:148]
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cc = to_bytes(emb[0:4])
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pi = to_bytes(emb[4:5])
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lcss = to_bytes(emb[5:7])
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sync = False
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return (voice, cc, lcss, sync)
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def voice(_string):
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burst = to_bits(_string)
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voice = _burst[0:108] + _burst[156:264]
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emb = burst[108:116] + _burst[148:156]
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embedded = burst[116:148]
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return (voice, emb, embedded)
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def to_bytes(_bits):
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add_bits = 8 - (len(_bits) % 8)
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if add_bits < 8:
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for bit in xrange(add_bits):
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_bits.insert(0,0)
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_string = _bits.tobytes()
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return _string
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#------------------------------------------------------------------------------
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# Used to execute the module directly to run built-in tests
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#------------------------------------------------------------------------------
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if __name__ == '__main__':
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from binascii import b2a_hex as h
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from time import time
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# SAMPLE, KNOWN GOOD DMR BURSTS
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data_head = '\x2b\x60\x04\x10\x1f\x84\x2d\xd0\x0d\xf0\x7d\x41\x04\x6d\xff\x57\xd7\x5d\xf5\xde\x30\x15\x2e\x20\x70\xb2\x0f\x80\x3f\x88\xc6\x95\xe2'
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voice_a = '\xb9\xe8\x81\x52\x61\x73\x00\x2a\x6b\xb9\xe8\x81\x52\x67\x55\xfd\x7d\xf7\x5f\x71\x73\x00\x2a\x6b\xb9\xe8\x81\x52\x61\x73\x00\x2a\x6a'
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voice_b = '\xb9\xe8\x81\x52\x61\x73\x00\x2a\x6b\xb9\xe8\x81\x52\x61\x34\xe0\xf0\x60\x69\x11\x73\x00\x2a\x6b\xb9\xe8\x81\x52\x61\x73\x00\x2a\x6a'
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voice_c = '\xb9\xe8\x81\x52\x61\x73\x00\x2a\x6b\xb9\xe8\x81\x52\x61\x71\x71\x10\x04\x77\x41\x73\x00\x2a\x6b\xb9\xe8\x81\x52\x61\x73\x00\x2a\x6a'
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voice_d = '\xb9\xe8\x81\x52\x61\x73\x00\x2a\x6b\x95\x4b\xe6\x50\x01\x70\xc0\x31\x81\xb7\x43\x10\xb0\x07\x77\xa6\xc6\xcb\x53\x73\x27\x89\x48\x3a'
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voice_e = '\x86\x5a\xe7\x61\x75\x55\xb5\x06\x01\xb7\x58\xe6\x65\x11\x51\x75\xa0\xf4\xe0\x71\x24\x81\x50\x01\xff\xf5\xa3\x37\x70\x61\x28\xa7\xca'
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voice_f = '\xee\xe7\x81\x75\x74\x61\x4d\xf2\xff\xcc\xf4\xa0\x55\x11\x10\x00\x00\x00\x0e\x24\x30\x59\xe7\xf9\xe9\x08\xa0\x75\x62\x02\xcc\xd6\x22'
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voice_term = '\x2b\x0f\x04\xc4\x1f\x34\x2d\xa8\x0d\x80\x7d\xe1\x04\xad\xff\x57\xd7\x5d\xf5\xd9\x65\x01\x2d\x18\x77\xd2\x03\xc0\x37\x88\xdf\x95\xd1'
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print('Header Validation:')
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t0 = time()
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lc = voice_head_term(data_head)
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t1 = time()
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print(h(lc[0]), h(lc[1]), h(lc[2]), lc[3])
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print(t1-t0, '\n')
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print('Voice Burst A Validation:')
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t0 = time()
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lc = voice_burst(voice_a)
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t1 = time()
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print(h(lc[0]), h(lc[1]), h(lc[2]), lc[3])
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print(t1-t0, '\n')
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print('Voice Burst B Validation:')
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t0 = time()
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lc = voice_burst(voice_b)
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t1 = time()
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print(h(lc[0]), h(lc[1]), h(lc[2]), lc[3])
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print(t1-t0, '\n')
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print('Voice Burst C Validation:')
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t0 = time()
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lc = voice_burst(voice_c)
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t1 = time()
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print(h(lc[0]), h(lc[1]), h(lc[2]), lc[3])
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print(t1-t0, '\n')
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print('Voice Burst D Validation:')
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t0 = time()
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lc = voice_burst(voice_d)
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t1 = time()
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print(h(lc[0]), h(lc[1]), h(lc[2]), lc[3])
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print(t1-t0, '\n')
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print('Voice Burst E Validation:')
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t0 = time()
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lc = voice_burst(voice_e)
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t1 = time()
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print(h(lc[0]), h(lc[1]), h(lc[2]), lc[3])
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print(t1-t0, '\n')
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print('Voice Burst F Validation:')
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t0 = time()
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lc = voice_burst(voice_f)
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t1 = time()
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print(h(lc[0]), h(lc[1]), h(lc[2]), lc[3])
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print(t1-t0, '\n')
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print('Terminator Validation:')
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t0 = time()
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lc = voice_head_term(voice_term)
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t1 = time()
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print(h(lc[0]), h(lc[1]), h(lc[2]), lc[3])
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print(t1-t0) |