mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
294 lines
13 KiB
Python
294 lines
13 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Wed Dec 23 07:04:24 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 pyaudio
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import audioop
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import sys
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import logging
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import time
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import threading
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import helpers
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import static
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import arq
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#arq = arq.ARQ()
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class RF():
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def __init__(self):
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#-------------------------------------------- LOAD FREEDV
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libname = pathlib.Path().absolute() / "codec2/build_linux/src/libcodec2.so"
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self.c_lib = ctypes.CDLL(libname)
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#--------------------------------------------CREATE PYAUDIO INSTANCE
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self.p = pyaudio.PyAudio()
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#--------------------------------------------GET SUPPORTED SAMPLE RATES FROM SOUND DEVICE
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static.AUDIO_SAMPLE_RATE_RX = int(self.p.get_device_info_by_index(static.AUDIO_INPUT_DEVICE)['defaultSampleRate'])
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static.AUDIO_SAMPLE_RATE_TX = int(self.p.get_device_info_by_index(static.AUDIO_OUTPUT_DEVICE)['defaultSampleRate'])
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#--------------------------------------------OPEN AUDIO CHANNEL RX
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self.stream_rx = self.p.open(format=pyaudio.paInt16,
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channels=static.AUDIO_CHANNELS,
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rate=static.AUDIO_SAMPLE_RATE_RX,
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frames_per_buffer=static.AUDIO_FRAMES_PER_BUFFER,
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input=True,
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input_device_index=static.AUDIO_INPUT_DEVICE,
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)
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#--------------------------------------------OPEN AUDIO CHANNEL TX
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self.stream_tx = self.p.open(format=pyaudio.paInt16,
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channels=1,
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rate=static.AUDIO_SAMPLE_RATE_TX,
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frames_per_buffer=static.AUDIO_FRAMES_PER_BUFFER, #n_nom_modem_samples
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output=True,
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output_device_index=static.AUDIO_OUTPUT_DEVICE, #static.AUDIO_OUTPUT_DEVICE
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)
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#--------------------------------------------START AUDIO THREAD
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AUDIO_LISTEN_THREAD = threading.Thread(target=self.audio_listen, name="Audio Listener")
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AUDIO_LISTEN_THREAD.start()
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#--------------------------------------------START DECODER THREADS
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FREEDV_700D_THREAD = threading.Thread(target=self.receive, args=[7], name="700D Decoder")
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FREEDV_700D_THREAD.start()
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FREEDV_DATAC1_THREAD = threading.Thread(target=self.receive, args=[10], name="DATAC1 Decoder")
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FREEDV_DATAC1_THREAD.start()
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FREEDV_DATAC2_THREAD = threading.Thread(target=self.receive, args=[11], name="DATAC2 Decoder")
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FREEDV_DATAC2_THREAD.start()
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FREEDV_DATAC3_THREAD = threading.Thread(target=self.receive, args=[12], name="DATAC3 Decoder")
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FREEDV_DATAC3_THREAD.start()
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#--------------------------------------------------------------------------------------------------------
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def audio_listen(self):
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print("STARTING AUDIO LISTENER")
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while True:
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time.sleep(0.05)
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data = self.stream_rx.read(static.AUDIO_FRAMES_PER_BUFFER, exception_on_overflow = False)
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#static.AUDIO_BUFFER += data
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static.AUDIO_BUFFER += data.strip(b'\x00')
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rms = audioop.rms(data,2)
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print(rms)
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#--------------------------------------------------------------------------------------------------------
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# GET DATA AND MODULATE IT
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def transmit(self,mode,data_out):
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self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
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freedv = self.c_lib.freedv_open(mode)
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bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
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payload_per_frame = bytes_per_frame -2
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n_nom_modem_samples = self.c_lib.freedv_get_n_nom_modem_samples(freedv)
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n_tx_modem_samples = self.c_lib.freedv_get_n_tx_modem_samples(freedv)*2 #get n_tx_modem_samples which defines the size of the modulation object
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mod_out = ctypes.c_short * n_tx_modem_samples
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mod_out = mod_out()
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data_list = [data_out[i:i+payload_per_frame] for i in range(0, len(data_out), payload_per_frame)] # split incomming bytes to size of 30bytes, create a list and loop through it
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data_list_length = len(data_list)
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for i in range(data_list_length): # LOOP THROUGH DATA LIST
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if mode < 10: # don't generate CRC16 for modes 0 - 9
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buffer = bytearray(bytes_per_frame) # use this if no CRC16 checksum is required
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buffer[:len(data_list[i])] = data_list[i] # set buffersize to length of data which will be send
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print("buffer for ACK: " + str(buffer))
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if mode >= 10: #generate CRC16 for modes 10-12..
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buffer = bytearray(payload_per_frame) # use this if CRC16 checksum is required ( DATA1-3)
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buffer[:len(data_list[i])] = data_list[i] # set buffersize to length of data which will be send
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crc = ctypes.c_ushort(self.c_lib.freedv_gen_crc16(bytes(buffer), payload_per_frame)) # generate CRC16
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crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string
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buffer += crc # append crc16 to buffer
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data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
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self.c_lib.freedv_rawdatatx(freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer
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# -------------- preamble area
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modulation = bytes(mod_out)
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if mode == 7:
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mod_with_preamble = modulation[:len(modulation)] + modulation # double transmission in one audio burst
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if mode >= 10:
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mod_with_preamble = modulation[:0] + modulation # no preamble
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# -------------- audio sample rate conversion
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audio = audioop.ratecv(mod_with_preamble,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE_TX, static.TX_SAMPLE_STATE)
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# -------------- transmit audio
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self.stream_tx.write(audio[0])
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return mod_out
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#--------------------------------------------------------------------------------------------------------
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# GET ARQ BURST FRAME VOM BUFFER AND MODULATE IT
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def transmit_arq_burst(self,mode):
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self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
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freedv = self.c_lib.freedv_open(mode)
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bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
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payload_per_frame = bytes_per_frame -2
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n_nom_modem_samples = self.c_lib.freedv_get_n_nom_modem_samples(freedv)
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n_tx_modem_samples = self.c_lib.freedv_get_n_tx_modem_samples(freedv)*2 #get n_tx_modem_samples which defines the size of the modulation object
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mod_out = ctypes.c_short * n_tx_modem_samples
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mod_out = mod_out()
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arqburst = []
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for i in range(static.ARQ_TX_N_FRAMES):
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frame_type = 10 + static.ARQ_TX_N_FRAMES
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frame_type = bytes([frame_type])
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payload_data = bytes(static.TX_BUFFER[static.ARQ_N_SENT_FRAMES + i])
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arqframe = frame_type + burst_payload_crc + payload_data
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buffer = bytearray(static.FREEDV_PAYLOAD_PER_FRAME) # create TX buffer
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buffer[:len(arqframe)] = arqframe # set buffersize to length of data which will be send
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#arqburst.append(buffer) #append data to a buffer array, so we can loop through it
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crc = ctypes.c_ushort(self.c_lib.freedv_gen_crc16(bytes(buffer), arqburst)) # generate CRC16
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crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string
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buffer += crc # append crc16 to buffer
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arqburst.append(buffer)
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arqburstmodulation = []
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for i in range(static.ARQ_TX_N_FRAMES):
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data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(arqburst[i])
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self.c_lib.freedv_rawdatatx(freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer
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arqburstmodulation.append(mod_out)
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# -------------- preamble area
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if mode >= 10:
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mod_with_preamble = modulation[:0] + modulation # no preamble
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# -------------- audio sample rate conversion
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audio = audioop.ratecv(mod_with_preamble,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE_TX, static.TX_SAMPLE_STATE)
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# -------------- transmit audio
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self.stream_tx.write(audio[0])
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return mod_out
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#--------------------------------------------------------------------------------------------------------
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# DEMODULATE DATA AND RETURN IT
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def receive(self, mode):
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print("STARTING MODE: " + str(mode))
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static.MODEM_RECEIVE = True
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self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte)
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freedv = self.c_lib.freedv_open(mode)
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bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
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bytes_out = (ctypes.c_ubyte * bytes_per_frame)
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bytes_out = bytes_out() #get pointer from bytes_out
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i = 0
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while True: # Listne to audio until data arrives
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time.sleep(0.05) # here we reduce CPU load
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nin = self.c_lib.freedv_nin(freedv)
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#data_in = self.stream_rx.read(nin, exception_on_overflow = False)
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#print(len(data_in))
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#nbytes = self.c_lib.freedv_rawdatarx(freedv, bytes_out, data_in) # Demodulated data and get number of demodulated bytes
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data_in = static.AUDIO_BUFFER
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data_in = bytes(data_in)
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try:
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data_in = bytes(data_in)
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data = data_in[i:((nin*2)+i)] # * 2 because of byte size per audio frame ( 2bytes / 16bit?)
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self.c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), bytes_out, data] # check if really neccessary
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nbytes = self.c_lib.freedv_rawdatarx(freedv, bytes_out, data) # demodulate audio
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except IndexError:
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data_in = b'\x00'
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if nbytes == bytes_per_frame: # make sure, we receive a full frame
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print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out)))
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# --------------- DEBUGGING OUTPTUT -------------------------------------------
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#if mode >= 10:
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#
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# print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out[:-2])))
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# static.AUDIO_BUFFER = bytearray()
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#else:
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# print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out)))
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# --------------- END DEBUGGING OUTPTUT -------------------------------------------
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# CHECK IF FRAMETYPE IS BETWEEN 10 and 50 ------------------------
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frametype = int.from_bytes(bytes(bytes_out[:1]), "big")
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if 50 >= frametype >= 10 and len(bytes_out) > 30: # --> The length check filters out random strings without CRC
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static.AUDIO_BUFFER = bytearray()
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print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out[:-2])))
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arq.data_received(bytes(bytes_out[:-2])) #send payload data to arq checker without CRC16
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self.c_lib.freedv_set_sync(freedv, 0) #FORCE UNSYNC
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else:
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print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out)))
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# CHECK IF FRAME CONTAINS ACK------------------------ --> 700D / 7
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frametype = int.from_bytes(bytes(bytes_out[:1]), "big")
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if frametype == 60 and len(bytes_out) == 14:
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print("ACK FRAME RECEIVED!!!!!!!!!!")
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#if bytes(bytes_out[:1]) == b'<': #b'\7': < = 60
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# CHECK CRC 8 OF ACK FRAME
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print(bytes_out[:1])
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print(bytes_out[3:14])
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if bytes(bytes_out[:2]) == helpers.get_crc_8(bytes(bytes_out[3:14])):
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print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out)))
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arq.ack_received()
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# ------------------ OUR NICE ITERATOR MACHINE
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if len(static.AUDIO_BUFFER) > i: # WE WILL LOOP THROUGH OUR DATA BUFFER WHILE OUR BUFFER IS BIGGER THAN THE CHUNK POSITION
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i = (nin*2) + i
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else:
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i = 0
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