mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
112 lines
3.6 KiB
Python
112 lines
3.6 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Tue Dec 15 18:29:22 2020
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@author: DJ2LS
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"""
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import ctypes
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from ctypes import *
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import pathlib
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import binascii #required for string.to_bytes() function
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import sys
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import base64
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def main():
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modem = FreeDV() #Load FreeDV Class as "modem"
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modem.Demodulate()
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class FreeDV():
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def __init__(self):
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libname = pathlib.Path().absolute() / "libcodec2.so"
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self.c_lib = ctypes.CDLL(libname) # Load FreeDV shared libary
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self.freedv = self.c_lib.freedv_open(12) #Set FreeDV waveform ( 10,11,12 --> DATA1-3 )
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self.bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(self.freedv)/8) #get bytes per frame from selected waveform
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self.payload_per_frame = self.bytes_per_frame -2 #get frame payload because of 2byte CRC16 checksum
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self.n_max_modem_samples = self.c_lib.freedv_get_n_max_modem_samples(self.freedv)
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self.nin = self.c_lib.freedv_nin(self.freedv)
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print("N MAX MODEM SAMPLES: " + str(self.n_max_modem_samples))
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print("NIN: " + str(self.nin))
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print("BYTES PER FRAME: " + str(self.bytes_per_frame))
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print("---------------------------------")
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# MODULATION-IN OBJECT
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def ModulationIn(self):
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return (c_short * (self.n_max_modem_samples)) ##
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#return (c_short * 40000)
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#return (c_short * (self.nin))
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# Pointer for changing buffer data type
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def FrameBytes(self):
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return (c_ubyte * self.bytes_per_frame)
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#return (c_ubyte * 2)
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# Modulate function which returns modulated data
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def Demodulate(self):
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nin = self.c_lib.freedv_nin(self.freedv)
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#while (self.c_lib.freedv_nin(self.freedv) == nin):
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#while sys.stdin.buffer != 0:
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while True:
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samples = self.c_lib.freedv_nin(self.freedv)*2 ### MIT DER *2 funktioniert das irgendwie recht zuverlässig bei mode 5! Bei Mode 12 auch
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data_in = sys.stdin.buffer.read(samples)
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#buffer = bytearray(len(self.ModulationIn()())*sizeof(c_short)) # create empty byte array
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#buffer = bytearray(len(self.ModulationIn()())*self.n_max_modem_samples) # create empty byte array
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buffer = bytearray(self.n_max_modem_samples*2) # N MAX SAMPLES * 2
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buffer[:len(data_in)] = data_in # copy across what we have
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self.ModulationIn()()
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modulation = self.ModulationIn()# get an empty modulation array
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modulation = modulation.from_buffer_copy(buffer) # copy buffer across and get a pointer to it.
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bytes_out = self.FrameBytes()() # initilize a pointer to where bytes will be outputed
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nbytes = self.c_lib.freedv_rawdatarx(self.freedv, bytes_out, data_in)
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self.nin = self.c_lib.freedv_nin(self.freedv)
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print("INPUT PARSER: " + str(samples))
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print("INPUT LENGTH: " + str(len(data_in)))
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print("BUFFER LENGTH: " + str(len(buffer)))
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print("MODULATION LENGTH: " + str(len(modulation)))
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sync_state = self.c_lib.freedv_get_sync(self.freedv)
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if sync_state > 0:
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print("SYNC")
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# print data to terminal if bytes have been demodulated
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if nbytes > 0:
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print(bytes(bytes_out))
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#print(nbytes)
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#print(bytes(bytes_out))
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#Stop loop until data input is empty
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if len(data_in) == 0:
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False
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break
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main()
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