mirror of
https://github.com/DJ2LS/FreeDATA
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4435ef602e
send via socket "ACK:<DATA TX requests a ACK from RX. RX then sends an ACK to TX. ACK will be requested 3 times, else timeout. Todo: Frame ID, Code cleanup,...... and much much more
199 lines
7.7 KiB
Python
199 lines
7.7 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 static
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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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self.data_input = "stdin"
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self.data_input = "audio"
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self.data_output = "stdout"
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self.data_output = "audio"
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libname = pathlib.Path().absolute() / "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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# MODULATION-OUT OBJECT
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def ModulationOut(self):
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return (c_short * self.n_tx_modem_samples)
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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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# FRAME BYTES
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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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# GET DATA AND MODULATE IT
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def Transmit(self,data_out):
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mod_out = self.ModulationOut()() # new modulation object and get pointer to it
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data_list = [data_out[i:i+self.payload_per_frame] for i in range(0, len(data_out), self.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 self.mode < 10: # don't generate CRC16 for modes 0 - 9
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buffer = bytearray(self.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 self.mode >= 10: #generate CRC16 for modes 10-12..
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buffer = bytearray(self.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 = c_ushort(self.c_lib.freedv_gen_crc16(bytes(buffer), self.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 = self.FrameBytes().from_buffer_copy(buffer) #change data format from bytearray to ctypes.u_byte and copy from buffer to data
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self.c_lib.freedv_rawdatatx(self.freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer
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if self.data_output == "stdout":
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sys.stdout.buffer.write(mod_out) # print data to terminal for piping the output to other programs
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sys.stdout.flush() # flushing stdout
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if self.data_output == "audio":
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print(self.audio_channels)
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stream_tx = self.p.open(format=self.format,
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channels=self.audio_channels,
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rate=self.audio_sample_rate,
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frames_per_buffer=self.n_nom_modem_samples,
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output=True,
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output_device_index=self.audio_output_device,
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)
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audio = audioop.ratecv(mod_out,2,1,self.modem_sample_rate, self.audio_sample_rate, self.tx_sample_state)
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stream_tx.write(audio[0])
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stream_tx.close()
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return mod_out
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# DEMODULATE DATA AND RETURN IT
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def Receive(self):
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# Open Audio Channel once
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stream_rx = self.p.open(format=self.format,
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channels=self.audio_channels,
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rate=self.audio_sample_rate,
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frames_per_buffer=self.n_max_modem_samples,
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input=True,
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input_device_index=self.audio_input_device,
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)
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while static.MODEM_RECEIVE == True: # Listne to audio until data arrives
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#if self.data_input == "stdin":
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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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if self.data_input == "audio":
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data_in = stream_rx.read(self.c_lib.freedv_nin(self.freedv), exception_on_overflow = False)
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#print(bytes(data_in))
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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()() #Create new ModulationIn Object
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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) # Demodulated data and get number of demodulated bytes
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if nbytes == self.bytes_per_frame: # make sure, we receive a full frame
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print(bytes(bytes_out[:-2]))
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self.c_lib.freedv_set_sync(self.freedv, 0)
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#print(bytes(bytes_out))
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# CHECK IF FRAME CONTAINS ACK------------------------
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if bytes(bytes_out[:6]) == b'REQACK':
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print("REQACK FRAME ERKANNT!!!!")
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print("ADD TO SEND BUFFER")
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time.sleep(5)
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print("SEND ACK FRAME")
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self.Transmit(b'ACK')
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#----------------------------------------------------
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# CHECK IF FRAME CONTAINS ACK------------------------
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if bytes(bytes_out[:3]) == b'ACK':
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print("ACK FRAME ERKANNT!!!!")
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static.ACK_TIMEOUT = 1
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static.ACK_RECEIVED = 1
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static.ACK_RETRY = 3
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#----------------------------------------------------
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#return bytes(bytes_out[:-2])
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