#!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Created on Wed Dec 23 07:04:24 2020 @author: DJ2LS """ import ctypes from ctypes import * import pathlib import pyaudio import audioop import sys import logging import time import threading import helpers import static import arq class RF(): def __init__(self): #-------------------------------------------- LOAD FREEDV libname = pathlib.Path().absolute() / "codec2/build_linux/src/libcodec2.so" self.c_lib = ctypes.CDLL(libname) #--------------------------------------------CREATE PYAUDIO INSTANCE self.p = pyaudio.PyAudio() #--------------------------------------------GET SUPPORTED SAMPLE RATES FROM SOUND DEVICE static.AUDIO_SAMPLE_RATE_RX = int(self.p.get_device_info_by_index(static.AUDIO_INPUT_DEVICE)['defaultSampleRate']) static.AUDIO_SAMPLE_RATE_TX = int(self.p.get_device_info_by_index(static.AUDIO_OUTPUT_DEVICE)['defaultSampleRate']) #--------------------------------------------OPEN AUDIO CHANNEL RX self.stream_rx = self.p.open(format=pyaudio.paInt16, channels=static.AUDIO_CHANNELS, rate=static.AUDIO_SAMPLE_RATE_RX, frames_per_buffer=static.AUDIO_FRAMES_PER_BUFFER, input=True, input_device_index=static.AUDIO_INPUT_DEVICE, ) #--------------------------------------------OPEN AUDIO CHANNEL TX self.stream_tx = self.p.open(format=pyaudio.paInt16, channels=1, rate=static.AUDIO_SAMPLE_RATE_TX, frames_per_buffer=static.AUDIO_FRAMES_PER_BUFFER, #n_nom_modem_samples output=True, output_device_index=static.AUDIO_OUTPUT_DEVICE, #static.AUDIO_OUTPUT_DEVICE ) #--------------------------------------------START DECODER THREAD FREEDV_DECODER_THREAD = threading.Thread(target=self.receive, args=[12,7], name="FREEDV_DECODER_THREAD") FREEDV_DECODER_THREAD.start() #-------------------------------------------------------------------------------------------------------- # GET DATA AND MODULATE IT def transmit(self,mode,data_out): self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte) freedv = self.c_lib.freedv_open(mode) bytes_per_frame = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv)/8) payload_per_frame = bytes_per_frame -2 n_nom_modem_samples = self.c_lib.freedv_get_n_nom_modem_samples(freedv) 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 mod_out = ctypes.c_short * n_tx_modem_samples mod_out = mod_out() mod_out_preamble = ctypes.c_short * n_tx_modem_samples #1760 for mode 10,11,12 #4000 for mode 9 mod_out_preamble = mod_out_preamble() 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 data_list_length = len(data_list) for i in range(data_list_length): # LOOP THROUGH DATA LIST buffer = bytearray(payload_per_frame) # use this if CRC16 checksum is required ( DATA1-3) buffer[:len(data_list[i])] = data_list[i] # set buffersize to length of data which will be send crc = ctypes.c_ushort(self.c_lib.freedv_gen_crc16(bytes(buffer), payload_per_frame)) # generate CRC16 crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string buffer += crc # append crc16 to buffer data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer) self.c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble) self.c_lib.freedv_rawdatatx(freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer # -------------- preamble area # WE NEED TO ADJUST IT FOR SINGLE TRANSMISSION txbuffer = bytearray() txbuffer += bytes(mod_out_preamble) txbuffer += bytes(mod_out) # -------------- audio sample rate conversion audio = audioop.ratecv(txbuffer,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE_TX, static.TX_SAMPLE_STATE) # -------------- transmit audio self.stream_tx.write(audio[0]) #-------------------------------------------------------------------------------------------------------- # GET ARQ BURST FRAME VOM BUFFER AND MODULATE IT def transmit_arq_burst(self): static.ARQ_STATE = 'SENDING_DATA' self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte) freedv = self.c_lib.freedv_open(static.FREEDV_DATA_MODE) static.FREEDV_DATA_BYTES_PER_FRAME = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv)/8) static.FREEDV_DATA_PAYLOAD_PER_FRAME = static.FREEDV_DATA_BYTES_PER_FRAME -2 print(static.FREEDV_DATA_BYTES_PER_FRAME) n_nom_modem_samples = self.c_lib.freedv_get_n_nom_modem_samples(freedv) 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 mod_out = ctypes.c_short * n_tx_modem_samples mod_out = mod_out() mod_out_preamble = ctypes.c_short * 1760 #1760 for mode 10,11,12 #4000 for mode 9 mod_out_preamble = mod_out_preamble() self.c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble); txbuffer = bytearray() txbuffer += bytes(mod_out_preamble) for n in range(0,static.ARQ_TX_N_FRAMES_PER_BURST): #---------------------------BUILD ARQ BURST --------------------------------------------------------------------- frame_type = 10 + static.ARQ_TX_N_FRAMES_PER_BURST frame_type = bytes([frame_type]) payload_data = bytes(static.TX_BUFFER[static.ARQ_N_SENT_FRAMES + n]) arqframe = frame_type + static.ARQ_BURST_PAYLOAD_CRC + payload_data buffer = bytearray(static.FREEDV_DATA_PAYLOAD_PER_FRAME) # create TX buffer buffer[:len(arqframe)] = arqframe # set buffersize to length of data which will be send crc = ctypes.c_ushort(self.c_lib.freedv_gen_crc16(bytes(buffer), static.FREEDV_DATA_PAYLOAD_PER_FRAME)) # generate CRC16 crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string buffer += crc # append crc16 to buffer #arqburst.append(buffer) #txbuffer += buffer data = (ctypes.c_ubyte * static.FREEDV_DATA_BYTES_PER_FRAME).from_buffer_copy(buffer) self.c_lib.freedv_rawdatatx(freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer txbuffer += bytes(mod_out) # -------------- audio sample rate conversion audio = audioop.ratecv(txbuffer,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE_TX, static.TX_SAMPLE_STATE) # -------------- transmit audio self.stream_tx.write(audio[0]) static.ARQ_STATE = 'IDLE' def receive(self,data_mode,signalling_mode): print("RECEIVING FOR DATA MODE: " + str(data_mode)) print("RECEIVING FOR SIGNALLING MODE: " + str(signalling_mode)) self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte) freedv_data = self.c_lib.freedv_open(data_mode) freedv_signalling = self.c_lib.freedv_open(signalling_mode) static.FREEDV_DATA_BYTES_PER_FRAME = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv_data)/8) static.FREEDV_DATA_PAYLOAD_PER_FRAME = static.FREEDV_DATA_BYTES_PER_FRAME -2 static.FREEDV_SIGNALLING_BYTES_PER_FRAME = int(self.c_lib.freedv_get_bits_per_modem_frame(freedv_signalling)/8) static.FREEDV_SIGNALLING_PAYLOAD_PER_FRAME = static.FREEDV_SIGNALLING_BYTES_PER_FRAME -2 data_bytes_out = (ctypes.c_ubyte * static.FREEDV_DATA_BYTES_PER_FRAME) data_bytes_out = data_bytes_out() #get pointer from bytes_out signalling_bytes_out = (ctypes.c_ubyte * static.FREEDV_SIGNALLING_BYTES_PER_FRAME) signalling_bytes_out = signalling_bytes_out() #get pointer from bytes_out while 1: time.sleep(0.01) while static.ARQ_STATE == 'RECEIVING_DATA': time.sleep(0.01) nin = self.c_lib.freedv_nin(freedv_data) nin = int(nin*(static.AUDIO_SAMPLE_RATE_RX/static.MODEM_SAMPLE_RATE)) data_in = self.stream_rx.read(nin, exception_on_overflow = False) data_in = audioop.ratecv(data_in,2,1,static.AUDIO_SAMPLE_RATE_RX, static.MODEM_SAMPLE_RATE, None) data_in = data_in[0].rstrip(b'\x00') self.c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), data_bytes_out, data_in] # check if really neccessary nbytes = self.c_lib.freedv_rawdatarx(freedv_data, data_bytes_out, data_in) # demodulate audio if nbytes == static.FREEDV_DATA_BYTES_PER_FRAME: # CHECK IF FRAMETYPE IS BETWEEN 10 and 50 ------------------------ frametype = int.from_bytes(bytes(data_bytes_out[:1]), "big") if 50 >= frametype >= 10 and len(data_bytes_out) > 30: # --> The length check filters out random strings without CRC print("MODE: " + str(data_mode) + " DATA: " + str(bytes(data_bytes_out[:-2]))) arq.data_received(bytes(data_bytes_out[:-2])) #send payload data to arq checker without CRC16 self.c_lib.freedv_set_sync(freedv_data, 0) #FORCE UNSYNC else: print("MODE: " + str(data_mode) + " DATA: " + str(bytes(data_bytes_out))) while static.ARQ_STATE == 'IDLE' or static.ARQ_STATE == 'RECEIVING_ACK': time.sleep(0.01) nin = self.c_lib.freedv_nin(freedv_signalling) nin = int(nin*(static.AUDIO_SAMPLE_RATE_RX/static.MODEM_SAMPLE_RATE)) data_in = self.stream_rx.read(nin, exception_on_overflow = False) data_in = audioop.ratecv(data_in,2,1,static.AUDIO_SAMPLE_RATE_RX, static.MODEM_SAMPLE_RATE, None) data_in = data_in[0].rstrip(b'\x00') self.c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), signalling_bytes_out, data_in] # check if really neccessary nbytes = self.c_lib.freedv_rawdatarx(freedv_signalling, signalling_bytes_out, data_in) # demodulate audio # CHECK IF FRAME CONTAINS ACK------------------------ --> 700D / 7 frametype = int.from_bytes(bytes(signalling_bytes_out[:1]), "big") if frametype == 60 and len(signalling_bytes_out) == 14: print("ACK FRAME RECEIVED!!!!!!!!!!") #if bytes(bytes_out[:1]) == b'<': #b'\7': < = 60 # CHECK CRC 8 OF ACK FRAME print(signalling_bytes_out[:1]) print(signalling_bytes_out[3:14]) if bytes(signalling_bytes_out[:2]) == helpers.get_crc_8(bytes(signalling_bytes_out[3:14])): print("MODE: " + str(signalling_mode) + " DATA: " + str(bytes(signalling_bytes_out))) arq.ack_received()