#!/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']) static.AUDIO_SAMPLE_RATE_TX = 8000 static.AUDIO_SAMPLE_RATE_RX = 8000 #--------------------------------------------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=[static.FREEDV_DATA_MODE,static.FREEDV_SIGNALLING_MODE], name="FREEDV_DECODER_THREAD") FREEDV_DECODER_THREAD.start() #-------------------------------------------------------------------------------------------------------- def transmit_arq_ack(self,ack_buffer): #print(ack_buffer) static.ARQ_STATE = 'SENDING_ACK' static.PTT_STATE = True self.c_lib.freedv_open.restype = ctypes.POINTER(ctypes.c_ubyte) freedv = self.c_lib.freedv_open(static.FREEDV_SIGNALLING_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 * (1760*2) #1760 for mode 10,11,12 #4000 for mode 9 mod_out_preamble = mod_out_preamble() buffer = bytearray(payload_per_frame) # use this if CRC16 checksum is required ( DATA1-3) buffer[:len(ack_buffer)] = ack_buffer # 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) preamble_bytes = 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 txbuffer = bytearray() txbuffer += bytes(mod_out_preamble) txbuffer = txbuffer.rstrip(b'\x00') #lets remove unallocated memory because of wrong buffer :-/ txbuffer += bytes(mod_out) txbuffer = txbuffer.rstrip(b'\x00') #lets remove unallocated memory because of wrong buffer :-/ # -------------- transmit audio twice logging.debug("SEND SIGNALLING FRAME " + str(ack_buffer)) self.stream_tx.write(bytes(txbuffer)) self.stream_tx.write(bytes(txbuffer)) static.PTT_STATE = False static.ARQ_STATE = 'RECEIVING_DATA' #-------------------------------------------------------------------------------------------------------- # GET ARQ BURST FRAME VOM BUFFER AND MODULATE IT def transmit_arq_burst(self): static.PTT_STATE = True 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 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*2) #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) txbuffer = txbuffer.rstrip(b'\x00') #lets remove unallocated memory because of wrong buffer :-/ if static.ARQ_RPT_RECEIVED == False: for n in range(0,static.ARQ_TX_N_FRAMES_PER_BURST): #---------------------------BUILD ARQ BURST --------------------------------------------------------------------- frame_type = 10 + n + 1 #static.ARQ_TX_N_FRAMES_PER_BURST frame_type = bytes([frame_type]) payload_data = bytes(static.TX_BUFFER[static.ARQ_N_SENT_FRAMES + n]) n_current_arq_frame = static.ARQ_N_SENT_FRAMES + n + 1 static.ARQ_TX_N_CURRENT_ARQ_FRAME = n_current_arq_frame.to_bytes(2, byteorder='big') n_total_arq_frame = len(static.TX_BUFFER) static.ARQ_TX_N_TOTAL_ARQ_FRAMES = n_total_arq_frame.to_bytes(2, byteorder='big') arqframe = frame_type + \ bytes([static.ARQ_TX_N_FRAMES_PER_BURST]) + \ static.ARQ_TX_N_CURRENT_ARQ_FRAME + \ static.ARQ_TX_N_TOTAL_ARQ_FRAMES + \ static.DXCALLSIGN_CRC8 + \ static.MYCALLSIGN_CRC8 + \ payload_data #print(arqframe) 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 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) txbuffer = txbuffer.rstrip(b'\x00') #lets remove unallocated memory because of wrong buffer :-/ elif static.ARQ_RPT_RECEIVED == True: for n in range(0,len(static.ARQ_RPT_FRAMES)): missing_frame = int.from_bytes(static.ARQ_RPT_FRAMES[n], "big") #---------------------------BUILD ARQ BURST --------------------------------------------------------------------- frame_type = 10 + missing_frame #static.ARQ_TX_N_FRAMES_PER_BURST frame_type = bytes([frame_type]) payload_data = bytes(static.TX_BUFFER[static.ARQ_N_SENT_FRAMES + missing_frame - 1]) n_current_arq_frame = static.ARQ_N_SENT_FRAMES + missing_frame static.ARQ_TX_N_CURRENT_ARQ_FRAME = n_current_arq_frame.to_bytes(2, byteorder='big') n_total_arq_frame = len(static.TX_BUFFER) static.ARQ_TX_N_TOTAL_ARQ_FRAMES = n_total_arq_frame.to_bytes(2, byteorder='big') arqframe = frame_type + \ bytes([static.ARQ_TX_N_FRAMES_PER_BURST]) + \ static.ARQ_TX_N_CURRENT_ARQ_FRAME + \ static.ARQ_TX_N_TOTAL_ARQ_FRAMES + \ static.DXCALLSIGN_CRC8 + \ static.MYCALLSIGN_CRC8 + \ payload_data #print(arqframe) 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 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) txbuffer = txbuffer.rstrip(b'\x00') #lets remove unallocated memory because of wrong buffer :-/ # -------------- transmit audio self.stream_tx.write(bytes(txbuffer)) #time.sleep(0.5) static.ARQ_STATE = 'IDLE' #static.ARQ_STATE = 'RECEIVING_SIGNALLING' static.PTT_STATE = False #-------------------------------------------------------------------------------------------------------- def receive(self,data_mode,signalling_mode): force = False 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 # with this we can interrupt receiving while static.FREEDV_RECEIVE == True: time.sleep(0.01) # stuck in sync counter stuck_in_sync_counter = 0 stuck_in_sync_10_counter = 0 # 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) #print(audioop.rms(data_in, 2)) data_in = data_in.rstrip(b'\x00') #print(data_in) #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 logging.debug(self.c_lib.freedv_get_rx_status(freedv_data)) #-------------STUCK IN SYNC DETECTOR stuck_in_sync_counter += 1 if self.c_lib.freedv_get_rx_status(freedv_data) == 10: stuck_in_sync_10_counter += 1 if stuck_in_sync_counter == 33 and self.c_lib.freedv_get_rx_status(freedv_data) == 10: logging.critical("stuck in sync #1") self.c_lib.freedv_set_sync(freedv_data, 0) #FORCE UNSYNC stuck_in_sync_counter = 0 stuck_in_sync_10_counter = 0 data_in = None if stuck_in_sync_counter >= 66 and stuck_in_sync_10_counter >= 2: logging.critical("stuck in sync #2") self.c_lib.freedv_set_sync(freedv_data, 0) #FORCE UNSYNC stuck_in_sync_counter = 0 stuck_in_sync_10_counter = 0 data_in = None #----------------------------------- if nbytes == static.FREEDV_DATA_BYTES_PER_FRAME: # counter reset for stuck in sync counter stuck_in_sync_counter = 0 stuck_in_sync_10_counter = 0 # # CHECK IF FRAMETYPE IS BETWEEN 10 and 50 ------------------------ frametype = int.from_bytes(bytes(data_bytes_out[:1]), "big") frame = frametype - 10 n_frames_per_burst = int.from_bytes(bytes(data_bytes_out[1:2]), "big") if 50 >= frametype >= 10: if frame != 3 or force == True: arq.data_received(bytes(data_bytes_out[:-2])) #send payload data to arq checker without CRC16 #print("static.ARQ_RX_BURST_BUFFER.count(None) " + str(static.ARQ_RX_BURST_BUFFER.count(None))) if static.ARQ_RX_BURST_BUFFER.count(None) <= 1: logging.debug("FULL BURST BUFFER ---> UNSYNC") self.c_lib.freedv_set_sync(freedv_data, 0) else: logging.critical("---------------------------SIMULATED MISSING FRAME") force = True else: logging.info("MODE: " + str(data_mode) + " DATA: " + str(bytes(data_bytes_out))) # DO UNSYNC AFTER LAST BURST by checking the frame numbers agains the total frames per burst if frame == n_frames_per_burst: logging.debug("LAST FRAME ---> UNSYNC") self.c_lib.freedv_set_sync(freedv_data, 0) #FORCE UNSYNC while static.ARQ_STATE == 'IDLE' or static.ARQ_STATE == 'RECEIVING_SIGNALLING': 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 = data_in.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------------------------ if nbytes == static.FREEDV_SIGNALLING_BYTES_PER_FRAME: self.c_lib.freedv_set_sync(freedv_signalling, 0) frametype = int.from_bytes(bytes(signalling_bytes_out[:1]), "big") # BURST ACK if frametype == 60: logging.debug("ACK RECEIVED....") arq.burst_ack_received() # FRAME ACK elif frametype == 61: logging.debug("FRAME ACK RECEIVED....") arq.frame_ack_received() # FRAME RPT elif frametype == 62: logging.debug("REPEAT REQUEST RECEIVED....") arq.burst_rpt_received(signalling_bytes_out[:-2]) else: logging.debug("OTHER FRAME: " + str(signalling_bytes_out[:-2])) rxstatus = self.c_lib.freedv_get_rx_status(freedv_signalling) logging.debug("ACK-" + str(rxstatus)) if nbytes == static.FREEDV_SIGNALLING_BYTES_PER_FRAME or rxstatus == 10: self.c_lib.freedv_set_sync(freedv_signalling, 0) #FORCE UNSYNC