#!/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 #arq = arq.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 AUDIO THREAD AUDIO_LISTEN_THREAD = threading.Thread(target=self.audio_listen, name="Audio Listener") AUDIO_LISTEN_THREAD.start() #--------------------------------------------START DECODER THREADS FREEDV_700D_THREAD = threading.Thread(target=self.receive, args=[7], name="700D Decoder") FREEDV_700D_THREAD.start() FREEDV_DATAC1_THREAD = threading.Thread(target=self.receive, args=[10], name="DATAC1 Decoder") FREEDV_DATAC1_THREAD.start() FREEDV_DATAC2_THREAD = threading.Thread(target=self.receive, args=[11], name="DATAC2 Decoder") FREEDV_DATAC2_THREAD.start() FREEDV_DATAC3_THREAD = threading.Thread(target=self.receive, args=[12], name="DATAC3 Decoder") FREEDV_DATAC3_THREAD.start() #-------------------------------------------------------------------------------------------------------- def audio_listen(self): print("STARTING AUDIO LISTENER") while True: time.sleep(0.05) data = self.stream_rx.read(static.AUDIO_FRAMES_PER_BUFFER, exception_on_overflow = False) #static.AUDIO_BUFFER += data static.AUDIO_BUFFER += data.strip(b'\x00') rms = audioop.rms(data,2) print(rms) #-------------------------------------------------------------------------------------------------------- # 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() 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 if mode < 10: # don't generate CRC16 for modes 0 - 9 buffer = bytearray(bytes_per_frame) # use this if no CRC16 checksum is required buffer[:len(data_list[i])] = data_list[i] # set buffersize to length of data which will be send print("buffer for ACK: " + str(buffer)) if mode >= 10: #generate CRC16 for modes 10-12.. 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_rawdatatx(freedv,mod_out,data) # modulate DATA and safe it into mod_out pointer # -------------- preamble area modulation = bytes(mod_out) if mode == 7: mod_with_preamble = modulation[:len(modulation)] + modulation # double transmission in one audio burst if mode >= 10: mod_with_preamble = modulation[:0] + modulation # no preamble # -------------- audio sample rate conversion audio = audioop.ratecv(mod_with_preamble,2,1,static.MODEM_SAMPLE_RATE, static.AUDIO_SAMPLE_RATE_TX, static.TX_SAMPLE_STATE) # -------------- transmit audio self.stream_tx.write(audio[0]) return mod_out #-------------------------------------------------------------------------------------------------------- # DEMODULATE DATA AND RETURN IT def receive(self, mode): print("STARTING MODE: " + str(mode)) static.MODEM_RECEIVE = True 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) bytes_out = (ctypes.c_ubyte * bytes_per_frame) bytes_out = bytes_out() #get pointer from bytes_out i = 0 while True: # Listne to audio until data arrives time.sleep(0.05) # here we reduce CPU load nin = self.c_lib.freedv_nin(freedv) #data_in = self.stream_rx.read(nin, exception_on_overflow = False) #print(len(data_in)) #nbytes = self.c_lib.freedv_rawdatarx(freedv, bytes_out, data_in) # Demodulated data and get number of demodulated bytes data_in = static.AUDIO_BUFFER data_in = bytes(data_in) try: data_in = bytes(data_in) data = data_in[i:((nin*2)+i)] # * 2 because of byte size per audio frame ( 2bytes / 16bit?) self.c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), bytes_out, data] # check if really neccessary nbytes = self.c_lib.freedv_rawdatarx(freedv, bytes_out, data) # demodulate audio except IndexError: data_in = b'\x00' if nbytes == bytes_per_frame: # make sure, we receive a full frame print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out))) # --------------- DEBUGGING OUTPTUT ------------------------------------------- #if mode >= 10: # # print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out[:-2]))) # static.AUDIO_BUFFER = bytearray() #else: # print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out))) # --------------- END DEBUGGING OUTPTUT ------------------------------------------- # CHECK IF FRAMETYPE IS BETWEEN 10 and 50 ------------------------ frametype = int.from_bytes(bytes(bytes_out[:1]), "big") if 50 >= frametype >= 10 and len(bytes_out) > 30: # --> The length check filters out random strings without CRC static.AUDIO_BUFFER = bytearray() print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out[:-2]))) arq.data_received(bytes(bytes_out[:-2])) #send payload data to arq checker without CRC16 self.c_lib.freedv_set_sync(freedv, 0) #FORCE UNSYNC else: print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out))) # CHECK IF FRAME CONTAINS ACK------------------------ --> 700D / 7 frametype = int.from_bytes(bytes(bytes_out[:1]), "big") if frametype == 60 and len(bytes_out) == 14: print("ACK FRAME RECEIVED!!!!!!!!!!") #if bytes(bytes_out[:1]) == b'<': #b'\7': < = 60 # CHECK CRC 8 OF ACK FRAME print(bytes_out[:1]) print(bytes_out[3:14]) if bytes(bytes_out[:2]) == helpers.get_crc_8(bytes(bytes_out[3:14])): print("MODE: " + str(mode) + " DATA: " + str(bytes(bytes_out))) arq.ack_received() # ------------------ OUR NICE ITERATOR MACHINE if len(static.AUDIO_BUFFER) > i: # WE WILL LOOP THROUGH OUR DATA BUFFER WHILE OUR BUFFER IS BIGGER THAN THE CHUNK POSITION i = (nin*2) + i else: i = 0