mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
185 lines
7.4 KiB
Python
185 lines
7.4 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 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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#self.p = pyaudio.PyAudio()
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#self.defaultFrames = static.DEFAULT_FRAMES
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#self.audio_input_device = static.AUDIO_INPUT_DEVICE
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#self.audio_output_device = static.AUDIO_OUTPUT_DEVICE
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#self.tx_sample_state = static.TX_SAMPLE_STATE
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#self.rx_sample_state = static.RX_SAMPLE_STATE
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#self.audio_sample_rate = static.AUDIO_SAMPLE_RATE
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#self.modem_sample_rate = static.MODEM_SAMPLE_RATE
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#self.audio_frames_per_buffer = static.AUDIO_FRAMES_PER_BUFFER
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#self.audio_channels = static.AUDIO_CHANNELS
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#self.format = pyaudio.paInt16
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#self.stream = None
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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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#self.mode = static.FREEDV_MODE # define mode
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#self.freedv = self.c_lib.freedv_open(self.mode)
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#self.bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(self.freedv)/8)
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#self.payload_per_frame = self.bytes_per_frame -2
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#self.n_tx_modem_samples = self.c_lib.freedv_get_n_tx_modem_samples(self.freedv)*2 #get n_tx_modem_samples which defines the size of the modulation object
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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.n_nom_modem_samples = self.c_lib.freedv_get_n_nom_modem_samples(self.freedv)
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#self.nin = self.c_lib.freedv_nin(self.freedv)
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#static.FREEDV_BYTES_PER_FRAME = self.bytes_per_frame
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#static.FREEDV_PAYLOAD_PER_FRAME = self.payload_per_frame
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#print(static.AUDIO_INPUT_DEVICE)
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# Open Audio Channel once
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self.p = pyaudio.PyAudio()
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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,
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frames_per_buffer=4096,
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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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# GET DATA AND MODULATE IT
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def Transmit(self,mode,data_out):
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static.MODEM_RECEIVE = False
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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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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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p = pyaudio.PyAudio()
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stream_tx = p.open(format=pyaudio.paInt16,
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channels=static.AUDIO_CHANNELS,
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rate=static.AUDIO_SAMPLE_RATE,
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frames_per_buffer=n_nom_modem_samples,
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output=True,
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output_device_index=static.AUDIO_OUTPUT_DEVICE,
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)
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audio = audioop.ratecv(mod_out,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE, static.TX_SAMPLE_STATE)
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stream_tx.write(audio[0])
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print("KILL")
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stream_tx.stop_stream()
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stream_tx.close()
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p.terminate()
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return mod_out
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# DEMODULATE DATA AND RETURN IT
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def Receive(self, 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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#n_max_modem_samples = self.c_lib.freedv_get_n_max_modem_samples(freedv)
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bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
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#####################################################################################################
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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 static.MODEM_RECEIVE == True: # Listne to audio until data arrives
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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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nbytes = self.c_lib.freedv_rawdatarx(freedv, bytes_out, data_in) # Demodulated data and get number of demodulated bytes
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if nbytes == bytes_per_frame: # make sure, we receive a full frame
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if mode >= 10:
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print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out[:-2])))
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else:
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print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out)))
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self.c_lib.freedv_set_sync(freedv, 0) #FORCE UNSYNC
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# CHECK IF FRAMETYPE CONTAINS ACK------------------------
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frametype = int.from_bytes(bytes(bytes_out[:1]), "big")
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if 50 >= frametype >= 10 :
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arq.data_received(bytes(bytes_out[:-2])) #send payload data to arq checker without CRC16
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# CHECK IF FRAME CONTAINS ACK------------------------
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if bytes(bytes_out[:1]) == b'\7':
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arq.ack_received()
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#return bytes(bytes_out[:-2])
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#print("KILL")
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#stream_rx.stop_stream()
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#stream_rx.close()
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#p.terminate()
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