108 lines
4.3 KiB
Python
Executable File
108 lines
4.3 KiB
Python
Executable File
#!/usr/bin/env python
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#
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###############################################################################
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# Copyright (C) 2016-2019 Cortney T. Buffington, N0MJS <n0mjs@me.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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###############################################################################
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from bitarray import bitarray
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from dmr_utils3 import bptc, golay, qr
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from dmr_utils3.utils import bytes_3, bytes_4
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from dmr_utils3.const import EMB, SLOT_TYPE, BS_VOICE_SYNC, BS_DATA_SYNC, LC_OPT
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from random import randint
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from voice_lib import words
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# Precalculated "dmrbits" (DMRD packet byte 15) -- just (slot << 7 | this value) and you're good to go!
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HEADBITS = 0b00100001
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BURSTBITS = [0b00010000,0b00000001,0b00000010,0b00000011,0b00000100,0b00000101]
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TERMBITS = 0b00100010
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# Need a bitstring of 4-bytes of zero for burst F
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NULL_EMB_LC = bitarray(endian='big')
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NULL_EMB_LC.frombytes(b'\x00\x00\x00\x00')
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# This is where HBP encodes RSSI, it will need to be null
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TAIL = b'\x00\x00'
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# WARNING this funciton uses yeild to return a generator that will pass the next HBP packet for a phrase
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# each time that it is called. Do NOT try to use it like a normal function.
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def pkt_gen(_rf_src, _dst_id, _peer, _slot, _phrase):
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# Calculate all of the static components up-front
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STREAM_ID = bytes_4(randint(0x00, 0xFFFFFFFF))
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SDP = _rf_src + _dst_id + _peer
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LC = LC_OPT + _dst_id + _rf_src
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HEAD_LC = bptc.encode_header_lc(LC)
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HEAD_LC = [HEAD_LC[:98], HEAD_LC[-98:]]
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TERM_LC = bptc.encode_terminator_lc(LC)
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TERM_LC = [TERM_LC[:98], TERM_LC[-98:]]
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EMB_LC = bptc.encode_emblc(LC)
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EMBED = []
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EMBED.append( BS_VOICE_SYNC )
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EMBED.append(EMB['BURST_B'][:8] + EMB_LC[1] + EMB['BURST_B'][-8:])
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EMBED.append(EMB['BURST_C'][:8] + EMB_LC[2] + EMB['BURST_C'][-8:])
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EMBED.append(EMB['BURST_D'][:8] + EMB_LC[3] + EMB['BURST_D'][-8:])
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EMBED.append(EMB['BURST_E'][:8] + EMB_LC[4] + EMB['BURST_E'][-8:])
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EMBED.append(EMB['BURST_F'][:8] + NULL_EMB_LC + EMB['BURST_F'][-8:])
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#initialize the HBP calls stream sequence to 0
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SEQ = 0
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# Send the Call Stream
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# Send 3 Voice Header Frames
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for i in range(3):
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pkt = b'DMRD' + bytes([SEQ]) + SDP + bytes([_slot << 7 | HEADBITS]) + STREAM_ID + (HEAD_LC[0] + SLOT_TYPE['VOICE_LC_HEAD'][:10] + BS_DATA_SYNC + SLOT_TYPE['VOICE_LC_HEAD'][-10:] + HEAD_LC[1]).tobytes() + TAIL
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SEQ = (SEQ + 1) % 0x100
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yield pkt
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# Send each burst, six bursts per Superframe rotating through with the proper EMBED value per burst A-F
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for word in _phrase:
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for burst in range(0, len(word)):
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pkt = b'DMRD' + bytes([SEQ]) + SDP + bytes([_slot << 7 | BURSTBITS[burst % 6]]) + STREAM_ID + (word[burst + 0][0] + EMBED[burst % 6] + word[burst + 0][1]).tobytes() + TAIL
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SEQ = (SEQ + 1) % 0x100
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yield pkt
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# Send a single Voice Terminator Frame
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pkt = b'DMRD' + bytes([SEQ]) + SDP + bytes([_slot << 7 | TERMBITS]) + STREAM_ID + (TERM_LC[0] + SLOT_TYPE['VOICE_LC_TERM'][:10] + BS_DATA_SYNC + SLOT_TYPE['VOICE_LC_TERM'][-10:] + TERM_LC[1]).tobytes() + TAIL
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SEQ = (SEQ + 1) % 0x100
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yield pkt
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if SEQ == 255:
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SEQ = 0
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# Return False to indicate we're done.
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return False
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if __name__ == '__main__':
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from time import time
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speech = pkt_gen(bytes_3(3120101), bytes_3(3120), bytes_4(312000), 0, [words['all_circuits'], words['all_circuits']])
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while True:
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try:
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pkt = next(speech)
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except StopIteration:
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break
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print(len(pkt), pkt[4], pkt)
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