#!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Created on Wed Dec 23 07:04:24 2020 @author: DJ2LS """ # pylint: disable=invalid-name, line-too-long, c-extension-no-member # pylint: disable=import-outside-toplevel import atexit import ctypes import os import queue import threading import time from collections import deque import codec2 import itertools import numpy as np import sock import sounddevice as sd from global_instances import AudioParam, HamlibParam, ModemParam, TCIParam, Modem from static import FRAME_TYPE import structlog import tci import cw from queues import DATA_QUEUE_RECEIVED, MODEM_RECEIVED_QUEUE, MODEM_TRANSMIT_QUEUE, RIGCTLD_COMMAND_QUEUE, \ AUDIO_RECEIVED_QUEUE, AUDIO_TRANSMIT_QUEUE, MESH_RECEIVED_QUEUE import audio import event_manager TESTMODE = False RXCHANNEL = "" TXCHANNEL = "" Modem.transmitting = False # Receive only specific modes to reduce CPU load RECEIVE_SIG0 = True RECEIVE_SIG1 = False RECEIVE_DATAC1 = False RECEIVE_DATAC3 = False RECEIVE_DATAC4 = False # state buffer SIG0_DATAC13_STATE = [] SIG1_DATAC13_STATE = [] DAT0_DATAC1_STATE = [] DAT0_DATAC3_STATE = [] DAT0_DATAC4_STATE = [] FSK_LDPC0_STATE = [] FSK_LDPC1_STATE = [] class RF: """Class to encapsulate interactions between the audio device and codec2""" log = structlog.get_logger("RF") def __init__(self, config, event_queue, fft_queue, service_queue, states) -> None: self.config = config self.service_queue = service_queue self.states = states self.sampler_avg = 0 self.buffer_avg = 0 # these are crc ids now self.audio_input_device = config['AUDIO']['input_device'] self.audio_output_device = config['AUDIO']['output_device'] self.rx_audio_level = config['AUDIO']['rx_audio_level'] self.tx_audio_level = config['AUDIO']['tx_audio_level'] self.enable_audio_auto_tune = config['AUDIO']['enable_auto_tune'] self.enable_fft = config['Modem']['enable_fft'] self.tx_delay = config['Modem']['tx_delay'] self.tuning_range_fmin = config['Modem']['tuning_range_fmin'] self.tuning_range_fmax = config['Modem']['tuning_range_fmax'] self.channel_busy_delay = 0 self.AUDIO_SAMPLE_RATE_RX = 48000 self.AUDIO_SAMPLE_RATE_TX = 48000 self.MODEM_SAMPLE_RATE = codec2.api.FREEDV_FS_8000 self.AUDIO_FRAMES_PER_BUFFER_RX = 2400 * 2 # 8192 # 8192 Let's do some tests with very small chunks for TX self.AUDIO_FRAMES_PER_BUFFER_TX = 1200 if HamlibParam.hamlib_radiocontrol in ["tci"] else 2400 * 2 # 8 * (self.AUDIO_SAMPLE_RATE_RX/self.MODEM_SAMPLE_RATE) == 48 self.AUDIO_CHANNELS = 1 self.MODE = 0 self.is_codec2_traffic_cooldown = 20 self.is_codec2_traffic_counter = 0 # Locking state for mod out so buffer will be filled before we can use it # https://github.com/DJ2LS/FreeDATA/issues/127 # https://github.com/DJ2LS/FreeDATA/issues/99 self.mod_out_locked = True # Make sure our resampler will work assert (self.AUDIO_SAMPLE_RATE_RX / self.MODEM_SAMPLE_RATE) == codec2.api.FDMDV_OS_48 # type: ignore self.modem_transmit_queue = MODEM_TRANSMIT_QUEUE self.modem_received_queue = MODEM_RECEIVED_QUEUE self.audio_received_queue = AUDIO_RECEIVED_QUEUE self.audio_transmit_queue = AUDIO_TRANSMIT_QUEUE # Init FIFO queue to store modulation out in self.modoutqueue = deque() self.event_manager = event_manager.EventManager([ event_queue, sock.SOCKET_QUEUE]) self.fft_queue = fft_queue self.start_modem() # -------------------------------------------------------------------------------------------------------- def tci_tx_callback(self) -> None: """ Callback for TCI TX """ while True: threading.Event().wait(0.01) if len(self.modoutqueue) > 0 and not self.mod_out_locked: HamlibParam.ptt_state = self.radio.set_ptt(True) self.event_manager.send_ptt_change(True) data_out = self.modoutqueue.popleft() self.tci_module.push_audio(data_out) def start_modem(self): if not TESTMODE and HamlibParam.hamlib_radiocontrol not in ["tci"]: result = self.init_audio() elif not TESTMODE: result = self.init_tci() else: result = self.init_mkfifo() if result not in [False]: # init codec2 instances self.init_codec2() # init rig control self.init_rig_control() # init decoders self.init_decoders() # init decoding threads self.init_data_threads() atexit.register(self.stream.stop) else: return False def stop_modem(self): try: # let's stop the modem service self.service_queue.put("stop") # simulate audio class active state for reducing cli output # self.stream = lambda: None # self.stream.active = False # self.stream.stop except Exception: self.log.error("[MDM] Error stopping modem") def init_audio(self): self.log.info(f"[MDM] init: get audio devices", input_device=self.audio_input_device, output_device=self.audio_output_device) try: result = audio.get_device_index_from_crc(self.audio_input_device, True) if result is None: raise ValueError("Invalid input device") else: in_dev_index, in_dev_name = result result = audio.get_device_index_from_crc(self.audio_output_device, False) if result is None: raise ValueError("Invalid output device") else: out_dev_index, out_dev_name = result self.log.info(f"[MDM] init: receiving audio from '{in_dev_name}'") self.log.info(f"[MDM] init: transmiting audio on '{out_dev_name}'") self.log.debug("[MDM] init: starting pyaudio callback and decoding threads") # init codec2 resampler self.resampler = codec2.resampler() # init audio stream self.stream = sd.RawStream( channels=1, dtype="int16", callback=self.callback, device=(in_dev_index, out_dev_index), samplerate=self.AUDIO_SAMPLE_RATE_RX, blocksize=4800, ) self.stream.start() return True except Exception as audioerr: self.log.error("[MDM] init: starting pyaudio callback failed", e=audioerr) self.stop_modem() return False def init_tci(self): # placeholder area for processing audio via TCI # https://github.com/maksimus1210/TCI self.log.warning("[MDM] [TCI] Not yet fully implemented", ip=TCIParam.ip, port=TCIParam.port) # we are trying this by simulating an audio stream Object like with mkfifo class Object: """An object for simulating audio stream""" active = True self.stream = Object() # lets init TCI module self.tci_module = tci.TCICtrl() tci_rx_callback_thread = threading.Thread( target=self.tci_rx_callback, name="TCI RX CALLBACK THREAD", daemon=True, ) tci_rx_callback_thread.start() # let's start the audio tx callback self.log.debug("[MDM] Starting tci tx callback thread") tci_tx_callback_thread = threading.Thread( target=self.tci_tx_callback, name="TCI TX CALLBACK THREAD", daemon=True, ) tci_tx_callback_thread.start() def init_mkfifo(self): class Object: """An object for simulating audio stream""" active = True self.stream = Object() # Create mkfifo buffers try: os.mkfifo(RXCHANNEL) os.mkfifo(TXCHANNEL) except Exception as err: self.log.info(f"[MDM] init:mkfifo: Exception: {err}") mkfifo_write_callback_thread = threading.Thread( target=self.mkfifo_write_callback, name="MKFIFO WRITE CALLBACK THREAD", daemon=True, ) mkfifo_write_callback_thread.start() self.log.debug("[MDM] Starting mkfifo_read_callback") mkfifo_read_callback_thread = threading.Thread( target=self.mkfifo_read_callback, name="MKFIFO READ CALLBACK THREAD", daemon=True, ) mkfifo_read_callback_thread.start() def tci_rx_callback(self) -> None: """ Callback for TCI RX data_in48k must be filled with 48000Hz audio raw data """ while True: x = self.audio_received_queue.get() x = np.frombuffer(x, dtype=np.int16) # x = self.resampler.resample48_to_8(x) if self.enable_fft: self.calculate_fft(x) length_x = len(x) for data_buffer, receive in [ (self.sig0_datac13_buffer, RECEIVE_SIG0), (self.sig1_datac13_buffer, RECEIVE_SIG1), (self.dat0_datac1_buffer, RECEIVE_DATAC1), (self.dat0_datac3_buffer, RECEIVE_DATAC3), (self.dat0_datac4_buffer, RECEIVE_DATAC4), (self.fsk_ldpc_buffer_0, Modem.enable_fsk), (self.fsk_ldpc_buffer_1, Modem.enable_fsk), ]: if ( not (data_buffer.nbuffer + length_x) > data_buffer.size and receive ): data_buffer.push(x) def mkfifo_read_callback(self) -> None: """ Support testing by reading the audio data from a pipe and depositing the data into the codec data buffers. """ while True: threading.Event().wait(0.01) # -----read data_in48k = bytes() with open(RXCHANNEL, "rb") as fifo: for line in fifo: data_in48k += line while len(data_in48k) >= 48: x = np.frombuffer(data_in48k[:48], dtype=np.int16) x = self.resampler.resample48_to_8(x) data_in48k = data_in48k[48:] length_x = len(x) for data_buffer, receive in [ (self.sig0_datac13_buffer, RECEIVE_SIG0), (self.sig1_datac13_buffer, RECEIVE_SIG1), (self.dat0_datac1_buffer, RECEIVE_DATAC1), (self.dat0_datac3_buffer, RECEIVE_DATAC3), (self.dat0_datac4_buffer, RECEIVE_DATAC4), (self.fsk_ldpc_buffer_0, Modem.enable_fsk), (self.fsk_ldpc_buffer_1, Modem.enable_fsk), ]: if ( not (data_buffer.nbuffer + length_x) > data_buffer.size and receive ): data_buffer.push(x) def mkfifo_write_callback(self) -> None: """Support testing by writing the audio data to a pipe.""" while True: threading.Event().wait(0.01) # -----write if len(self.modoutqueue) > 0 and not self.mod_out_locked: data_out48k = self.modoutqueue.popleft() # print(len(data_out48k)) with open(TXCHANNEL, "wb") as fifo_write: fifo_write.write(data_out48k) fifo_write.flush() fifo_write.flush() # Callback for the audio streaming devices def callback(self, data_in48k, outdata, frames, time, status) -> None: """ Receive data into appropriate queue. Args: data_in48k: Incoming data received outdata: Container for the data returned frames: Number of frames time: status: """ # self.log.debug("[MDM] callback") x = np.frombuffer(data_in48k, dtype=np.int16) x = self.resampler.resample48_to_8(x) x = set_audio_volume(x, self.rx_audio_level) # audio recording for debugging purposes if AudioParam.audio_record: AudioParam.audio_record_file.writeframes(x) # Avoid decoding when transmitting to reduce CPU # TODO Overriding this for testing purposes # if not Modem.transmitting: length_x = len(x) # Avoid buffer overflow by filling only if buffer for # selected datachannel mode is not full for audiobuffer, receive, index in [ (self.sig0_datac13_buffer, RECEIVE_SIG0, 0), (self.sig1_datac13_buffer, RECEIVE_SIG1, 1), (self.dat0_datac1_buffer, RECEIVE_DATAC1, 2), (self.dat0_datac3_buffer, RECEIVE_DATAC3, 3), (self.dat0_datac4_buffer, RECEIVE_DATAC4, 4), (self.fsk_ldpc_buffer_0, Modem.enable_fsk, 5), (self.fsk_ldpc_buffer_1, Modem.enable_fsk, 6), ]: if (audiobuffer.nbuffer + length_x) > audiobuffer.size: AudioParam.buffer_overflow_counter[index] += 1 elif receive: audiobuffer.push(x) # end of "not Modem.transmitting" if block if not self.modoutqueue or self.mod_out_locked: data_out48k = np.zeros(frames, dtype=np.int16) if self.enable_fft: self.calculate_fft(x) else: if not HamlibParam.ptt_state: # TODO Moved to this place for testing # Maybe we can avoid moments of silence before transmitting HamlibParam.ptt_state = self.radio.set_ptt(True) self.event_manager.send_ptt_change(True) data_out48k = self.modoutqueue.popleft() if self.enable_fft: self.calculate_fft(data_out48k) try: outdata[:] = data_out48k[:frames] except IndexError as err: self.log.debug(f"[MDM] callback: IndexError: {err}") # return (data_out48k, audio.pyaudio.paContinue) # -------------------------------------------------------------------- def transmit( self, mode, repeats: int, repeat_delay: int, frames: bytearray ) -> bool: """ Args: mode: repeats: repeat_delay: frames: """ self.reset_data_sync() if mode == codec2.FREEDV_MODE.datac0.value: freedv = self.freedv_datac0_tx elif mode == codec2.FREEDV_MODE.datac1.value: freedv = self.freedv_datac1_tx elif mode == codec2.FREEDV_MODE.datac3.value: freedv = self.freedv_datac3_tx elif mode == codec2.FREEDV_MODE.datac4.value: freedv = self.freedv_datac4_tx elif mode == codec2.FREEDV_MODE.datac13.value: freedv = self.freedv_datac13_tx elif mode == codec2.FREEDV_MODE.fsk_ldpc_0.value: freedv = self.freedv_ldpc0_tx elif mode == codec2.FREEDV_MODE.fsk_ldpc_1.value: freedv = self.freedv_ldpc1_tx else: return False Modem.transmitting = True # if we're transmitting FreeDATA signals, reset channel busy state self.states.channel_busy = False start_of_transmission = time.time() # TODO Moved ptt toggle some steps before audio is ready for testing # Toggle ptt early to save some time and send ptt state via socket # HamlibParam.ptt_state = self.radio.set_ptt(True) # jsondata = {"ptt": "True"} # data_out = json.dumps(jsondata) # sock.SOCKET_QUEUE.put(data_out) # Open codec2 instance self.MODE = mode # Get number of bytes per frame for mode bytes_per_frame = int(codec2.api.freedv_get_bits_per_modem_frame(freedv) / 8) payload_bytes_per_frame = bytes_per_frame - 2 # Init buffer for data n_tx_modem_samples = codec2.api.freedv_get_n_tx_modem_samples(freedv) mod_out = ctypes.create_string_buffer(n_tx_modem_samples * 2) # Init buffer for preample n_tx_preamble_modem_samples = codec2.api.freedv_get_n_tx_preamble_modem_samples( freedv ) mod_out_preamble = ctypes.create_string_buffer(n_tx_preamble_modem_samples * 2) # Init buffer for postamble n_tx_postamble_modem_samples = ( codec2.api.freedv_get_n_tx_postamble_modem_samples(freedv) ) mod_out_postamble = ctypes.create_string_buffer( n_tx_postamble_modem_samples * 2 ) # Add empty data to handle ptt toggle time if self.tx_delay > 0: data_delay = int(self.MODEM_SAMPLE_RATE * (self.tx_delay / 1000)) # type: ignore mod_out_silence = ctypes.create_string_buffer(data_delay * 2) txbuffer = bytes(mod_out_silence) else: txbuffer = bytes() self.log.debug( "[MDM] TRANSMIT", mode=self.MODE, payload=payload_bytes_per_frame, delay=self.tx_delay ) for _ in range(repeats): # Create modulation for all frames in the list for frame in frames: # Write preamble to txbuffer # codec2 fsk preamble may be broken - # at least it sounds like that, so we are disabling it for testing if self.MODE not in [ codec2.FREEDV_MODE.fsk_ldpc_0.value, codec2.FREEDV_MODE.fsk_ldpc_1.value, ]: # Write preamble to txbuffer codec2.api.freedv_rawdatapreambletx(freedv, mod_out_preamble) txbuffer += bytes(mod_out_preamble) # Create buffer for data # Use this if CRC16 checksum is required (DATAc1-3) buffer = bytearray(payload_bytes_per_frame) # Set buffersize to length of data which will be send buffer[: len(frame)] = frame # type: ignore # Create crc for data frame - # Use the crc function shipped with codec2 # to avoid CRC algorithm incompatibilities # Generate CRC16 crc = ctypes.c_ushort( codec2.api.freedv_gen_crc16(bytes(buffer), payload_bytes_per_frame) ) # Convert crc to 2-byte (16-bit) hex string crc = crc.value.to_bytes(2, byteorder="big") # Append CRC to data buffer buffer += crc data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer) # modulate DATA and save it into mod_out pointer codec2.api.freedv_rawdatatx(freedv, mod_out, data) txbuffer += bytes(mod_out) # codec2 fsk postamble may be broken - # at least it sounds like that, so we are disabling it for testing if self.MODE not in [ codec2.FREEDV_MODE.fsk_ldpc_0.value, codec2.FREEDV_MODE.fsk_ldpc_1.value, ]: # Write postamble to txbuffer codec2.api.freedv_rawdatapostambletx(freedv, mod_out_postamble) # Append postamble to txbuffer txbuffer += bytes(mod_out_postamble) # Add delay to end of frames samples_delay = int(self.MODEM_SAMPLE_RATE * (repeat_delay / 1000)) # type: ignore mod_out_silence = ctypes.create_string_buffer(samples_delay * 2) txbuffer += bytes(mod_out_silence) # Re-sample back up to 48k (resampler works on np.int16) x = np.frombuffer(txbuffer, dtype=np.int16) self.audio_auto_tune() x = set_audio_volume(x, self.tx_audio_level) if not HamlibParam.hamlib_radiocontrol in ["tci"]: txbuffer_out = self.resampler.resample8_to_48(x) else: txbuffer_out = x # Explicitly lock our usage of mod_out_queue if needed # This could avoid audio problems on slower CPU # we will fill our modout list with all data, then start # processing it in audio callback self.mod_out_locked = True # ------------------------------- # add modulation to modout_queue self.enqueue_modulation(txbuffer_out) # Release our mod_out_lock, so we can use the queue self.mod_out_locked = False # we need to wait manually for tci processing if HamlibParam.hamlib_radiocontrol in ["tci"]: duration = len(txbuffer_out) / 8000 timestamp_to_sleep = time.time() + duration self.log.debug("[MDM] TCI calculated duration", duration=duration) tci_timeout_reached = False #while time.time() < timestamp_to_sleep: # threading.Event().wait(0.01) else: timestamp_to_sleep = time.time() # set tci timeout reached to True for overriding if not used tci_timeout_reached = True while self.modoutqueue or not tci_timeout_reached: if HamlibParam.hamlib_radiocontrol in ["tci"]: if time.time() < timestamp_to_sleep: tci_timeout_reached = False else: tci_timeout_reached = True threading.Event().wait(0.01) # if we're transmitting FreeDATA signals, reset channel busy state self.states.channel_busy = False HamlibParam.ptt_state = self.radio.set_ptt(False) # Push ptt state to socket stream self.event_manager.send_ptt_change(False) # After processing, set the locking state back to true to be prepared for next transmission self.mod_out_locked = True self.modem_transmit_queue.task_done() Modem.transmitting = False end_of_transmission = time.time() transmission_time = end_of_transmission - start_of_transmission self.log.debug("[MDM] ON AIR TIME", time=transmission_time) def audio_auto_tune(self): # enable / disable AUDIO TUNE Feature / ALC correction if self.enable_audio_auto_tune: if HamlibParam.alc == 0.0: self.tx_audio_level = self.tx_audio_level + 20 elif 0.0 < HamlibParam.alc <= 0.1: print("0.0 < HamlibParam.alc <= 0.1") self.tx_audio_level = self.tx_audio_level + 2 self.log.debug("[MDM] AUDIO TUNE", audio_level=str(self.tx_audio_level), alc_level=str(HamlibParam.alc)) elif 0.1 < HamlibParam.alc < 0.2: print("0.1 < HamlibParam.alc < 0.2") self.tx_audio_level = self.tx_audio_level self.log.debug("[MDM] AUDIO TUNE", audio_level=str(self.tx_audio_level), alc_level=str(HamlibParam.alc)) elif 0.2 < HamlibParam.alc < 0.99: print("0.2 < HamlibParam.alc < 0.99") self.tx_audio_level = self.tx_audio_level - 20 self.log.debug("[MDM] AUDIO TUNE", audio_level=str(self.tx_audio_level), alc_level=str(HamlibParam.alc)) elif 1.0 >= HamlibParam.alc: print("1.0 >= HamlibParam.alc") self.tx_audio_level = self.tx_audio_level - 40 self.log.debug("[MDM] AUDIO TUNE", audio_level=str(self.tx_audio_level), alc_level=str(HamlibParam.alc)) else: self.log.debug("[MDM] AUDIO TUNE", audio_level=str(self.tx_audio_level), alc_level=str(HamlibParam.alc)) def transmit_morse(self, repeats, repeat_delay, frames): Modem.transmitting = True # if we're transmitting FreeDATA signals, reset channel busy state self.states.channel_busy = False self.log.debug( "[MDM] TRANSMIT", mode="MORSE" ) start_of_transmission = time.time() txbuffer_out = cw.MorseCodePlayer().text_to_signal("DJ2LS-1") self.mod_out_locked = True self.enqueue_modulation(txbuffer_out) self.mod_out_locked = False # we need to wait manually for tci processing if HamlibParam.hamlib_radiocontrol in ["tci"]: duration = len(txbuffer_out) / 8000 timestamp_to_sleep = time.time() + duration self.log.debug("[MDM] TCI calculated duration", duration=duration) tci_timeout_reached = False #while time.time() < timestamp_to_sleep: # threading.Event().wait(0.01) else: timestamp_to_sleep = time.time() # set tci timeout reached to True for overriding if not used tci_timeout_reached = True while self.modoutqueue or not tci_timeout_reached: if HamlibParam.hamlib_radiocontrol in ["tci"]: if time.time() < timestamp_to_sleep: tci_timeout_reached = False else: tci_timeout_reached = True threading.Event().wait(0.01) # if we're transmitting FreeDATA signals, reset channel busy state self.states.channel_busy = False HamlibParam.ptt_state = self.radio.set_ptt(False) # Push ptt state to socket stream self.event_manager.send_ptt_change(False) # After processing, set the locking state back to true to be prepared for next transmission self.mod_out_locked = True self.modem_transmit_queue.task_done() Modem.transmitting = False threading.Event().set() end_of_transmission = time.time() transmission_time = end_of_transmission - start_of_transmission self.log.debug("[MDM] ON AIR TIME", time=transmission_time) def enqueue_modulation(self, txbuffer_out): chunk_length = self.AUDIO_FRAMES_PER_BUFFER_TX # 4800 chunk = [ txbuffer_out[i: i + chunk_length] for i in range(0, len(txbuffer_out), chunk_length) ] for c in chunk: # Pad the chunk, if needed if len(c) < chunk_length: delta = chunk_length - len(c) delta_zeros = np.zeros(delta, dtype=np.int16) c = np.append(c, delta_zeros) # self.log.debug("[MDM] mod out shorter than audio buffer", delta=delta) self.modoutqueue.append(c) def init_decoders(self): if Modem.enable_fsk: audio_thread_fsk_ldpc0 = threading.Thread( target=self.audio_fsk_ldpc_0, name="AUDIO_THREAD FSK LDPC0", daemon=True ) audio_thread_fsk_ldpc0.start() audio_thread_fsk_ldpc1 = threading.Thread( target=self.audio_fsk_ldpc_1, name="AUDIO_THREAD FSK LDPC1", daemon=True ) audio_thread_fsk_ldpc1.start() else: audio_thread_sig0_datac13 = threading.Thread( target=self.audio_sig0_datac13, name="AUDIO_THREAD DATAC13 - 0", daemon=True ) audio_thread_sig0_datac13.start() audio_thread_sig1_datac13 = threading.Thread( target=self.audio_sig1_datac13, name="AUDIO_THREAD DATAC13 - 1", daemon=True ) audio_thread_sig1_datac13.start() audio_thread_dat0_datac1 = threading.Thread( target=self.audio_dat0_datac1, name="AUDIO_THREAD DATAC1", daemon=True ) audio_thread_dat0_datac1.start() audio_thread_dat0_datac3 = threading.Thread( target=self.audio_dat0_datac3, name="AUDIO_THREAD DATAC3", daemon=True ) audio_thread_dat0_datac3.start() audio_thread_dat0_datac4 = threading.Thread( target=self.audio_dat0_datac4, name="AUDIO_THREAD DATAC4", daemon=True ) audio_thread_dat0_datac4.start() def demodulate_audio( self, audiobuffer: codec2.audio_buffer, nin: int, freedv: ctypes.c_void_p, bytes_out, bytes_per_frame, state_buffer, mode_name, ) -> int: """ De-modulate supplied audio stream with supplied codec2 instance. Decoded audio is placed into `bytes_out`. :param audiobuffer: Incoming audio :type audiobuffer: codec2.audio_buffer :param nin: Number of frames codec2 is expecting :type nin: int :param freedv: codec2 instance :type freedv: ctypes.c_void_p :param bytes_out: Demodulated audio :type bytes_out: _type_ :param bytes_per_frame: Number of bytes per frame :type bytes_per_frame: int :param state_buffer: modem states :type state_buffer: int :param mode_name: mode name :type mode_name: str :return: NIN from freedv instance :rtype: int """ nbytes = 0 try: while self.stream.active: threading.Event().wait(0.01) while audiobuffer.nbuffer >= nin: # demodulate audio nbytes = codec2.api.freedv_rawdatarx( freedv, bytes_out, audiobuffer.buffer.ctypes ) # get current modem states and write to list # 1 trial # 2 sync # 3 trial sync # 6 decoded # 10 error decoding == NACK rx_status = codec2.api.freedv_get_rx_status(freedv) if rx_status not in [0]: # we need to disable this if in testmode as its causing problems with FIFO it seems if not TESTMODE: self.states.is_codec2_traffic = True self.is_codec2_traffic_counter = self.is_codec2_traffic_cooldown if not self.states.channel_busy: self.log.debug("[MDM] Setting channel_busy since codec2 data detected") self.states.channel_busy=True self.channel_busy_delay += 10 self.log.debug( "[MDM] [demod_audio] modem state", mode=mode_name, rx_status=rx_status, sync_flag=codec2.api.rx_sync_flags_to_text[rx_status] ) else: self.states.is_codec2_traffic = False # decrement codec traffic counter for making state smoother if self.is_codec2_traffic_counter > 0: self.is_codec2_traffic_counter -= 1 self.states.is_codec2_traffic = True else: self.states.is_codec2_traffic = False if rx_status == 10: state_buffer.append(rx_status) audiobuffer.pop(nin) nin = codec2.api.freedv_nin(freedv) if nbytes == bytes_per_frame: print(bytes(bytes_out)) # process commands only if Modem.listen = True if Modem.listen: # ignore data channel opener frames for avoiding toggle states # use case: opener already received, but ack got lost and we are receiving # an opener again if mode_name in ["sig1-datac13"] and int.from_bytes(bytes(bytes_out[:1]), "big") in [ FRAME_TYPE.ARQ_SESSION_OPEN.value, FRAME_TYPE.ARQ_DC_OPEN_W.value, FRAME_TYPE.ARQ_DC_OPEN_ACK_W.value, FRAME_TYPE.ARQ_DC_OPEN_N.value, FRAME_TYPE.ARQ_DC_OPEN_ACK_N.value ]: print("dropp") elif int.from_bytes(bytes(bytes_out[:1]), "big") in [ FRAME_TYPE.MESH_BROADCAST.value, FRAME_TYPE.MESH_SIGNALLING_PING.value, FRAME_TYPE.MESH_SIGNALLING_PING_ACK.value, ]: self.log.debug( "[MDM] [demod_audio] moving data to mesh dispatcher", nbytes=nbytes ) MESH_RECEIVED_QUEUE.put(bytes(bytes_out)) else: self.log.debug( "[MDM] [demod_audio] Pushing received data to received_queue", nbytes=nbytes ) self.modem_received_queue.put([bytes_out, freedv, bytes_per_frame]) self.get_scatter(freedv) self.calculate_snr(freedv) state_buffer = [] else: self.log.warning( "[MDM] [demod_audio] received frame but ignored processing", listen=Modem.listen ) except Exception as e: self.log.warning("[MDM] [demod_audio] Stream not active anymore", e=e) return nin def init_codec2(self): # Open codec2 instances # DATAC13 # SIGNALLING MODE 0 - Used for Connecting - Payload 14 Bytes self.sig0_datac13_freedv, \ self.sig0_datac13_bytes_per_frame, \ self.sig0_datac13_bytes_out, \ self.sig0_datac13_buffer, \ self.sig0_datac13_nin = \ self.init_codec2_mode(codec2.FREEDV_MODE.datac13.value, None) # DATAC13 # SIGNALLING MODE 1 - Used for ACK/NACK - Payload 5 Bytes self.sig1_datac13_freedv, \ self.sig1_datac13_bytes_per_frame, \ self.sig1_datac13_bytes_out, \ self.sig1_datac13_buffer, \ self.sig1_datac13_nin = \ self.init_codec2_mode(codec2.FREEDV_MODE.datac13.value, None) # DATAC1 self.dat0_datac1_freedv, \ self.dat0_datac1_bytes_per_frame, \ self.dat0_datac1_bytes_out, \ self.dat0_datac1_buffer, \ self.dat0_datac1_nin = \ self.init_codec2_mode(codec2.FREEDV_MODE.datac1.value, None) # DATAC3 self.dat0_datac3_freedv, \ self.dat0_datac3_bytes_per_frame, \ self.dat0_datac3_bytes_out, \ self.dat0_datac3_buffer, \ self.dat0_datac3_nin = \ self.init_codec2_mode(codec2.FREEDV_MODE.datac3.value, None) # DATAC4 self.dat0_datac4_freedv, \ self.dat0_datac4_bytes_per_frame, \ self.dat0_datac4_bytes_out, \ self.dat0_datac4_buffer, \ self.dat0_datac4_nin = \ self.init_codec2_mode(codec2.FREEDV_MODE.datac4.value, None) # FSK LDPC - 0 self.fsk_ldpc_freedv_0, \ self.fsk_ldpc_bytes_per_frame_0, \ self.fsk_ldpc_bytes_out_0, \ self.fsk_ldpc_buffer_0, \ self.fsk_ldpc_nin_0 = \ self.init_codec2_mode( codec2.FREEDV_MODE.fsk_ldpc.value, codec2.api.FREEDV_MODE_FSK_LDPC_0_ADV ) # FSK LDPC - 1 self.fsk_ldpc_freedv_1, \ self.fsk_ldpc_bytes_per_frame_1, \ self.fsk_ldpc_bytes_out_1, \ self.fsk_ldpc_buffer_1, \ self.fsk_ldpc_nin_1 = \ self.init_codec2_mode( codec2.FREEDV_MODE.fsk_ldpc.value, codec2.api.FREEDV_MODE_FSK_LDPC_1_ADV ) # INIT TX MODES - here we need all modes. self.freedv_datac0_tx = open_codec2_instance(codec2.FREEDV_MODE.datac0.value) self.freedv_datac1_tx = open_codec2_instance(codec2.FREEDV_MODE.datac1.value) self.freedv_datac3_tx = open_codec2_instance(codec2.FREEDV_MODE.datac3.value) self.freedv_datac4_tx = open_codec2_instance(codec2.FREEDV_MODE.datac4.value) self.freedv_datac13_tx = open_codec2_instance(codec2.FREEDV_MODE.datac13.value) self.freedv_ldpc0_tx = open_codec2_instance(codec2.FREEDV_MODE.fsk_ldpc_0.value) self.freedv_ldpc1_tx = open_codec2_instance(codec2.FREEDV_MODE.fsk_ldpc_1.value) def init_codec2_mode(self, mode, adv): """ Init codec2 and return some important parameters Args: self: mode: adv: Returns: c2instance, bytes_per_frame, bytes_out, audio_buffer, nin """ if adv: # FSK Long-distance Parity Code 1 - data frames c2instance = ctypes.cast( codec2.api.freedv_open_advanced( codec2.FREEDV_MODE.fsk_ldpc.value, ctypes.byref(adv), ), ctypes.c_void_p, ) else: # create codec2 instance c2instance = ctypes.cast( codec2.api.freedv_open(mode), ctypes.c_void_p ) # set tuning range codec2.api.freedv_set_tuning_range( c2instance, ctypes.c_float(ModemParam.tuning_range_fmin), ctypes.c_float(ModemParam.tuning_range_fmax), ) # get bytes per frame bytes_per_frame = int( codec2.api.freedv_get_bits_per_modem_frame(c2instance) / 8 ) # create byte out buffer bytes_out = ctypes.create_string_buffer(bytes_per_frame) # set initial frames per burst codec2.api.freedv_set_frames_per_burst(c2instance, 1) # init audio buffer audio_buffer = codec2.audio_buffer(2 * self.AUDIO_FRAMES_PER_BUFFER_RX) # get initial nin nin = codec2.api.freedv_nin(c2instance) # Additional Datac0-specific information - these are not referenced anywhere else. # self.sig0_datac0_payload_per_frame = self.sig0_datac0_bytes_per_frame - 2 # self.sig0_datac0_n_nom_modem_samples = codec2.api.freedv_get_n_nom_modem_samples( # self.sig0_datac0_freedv # ) # self.sig0_datac0_n_tx_modem_samples = codec2.api.freedv_get_n_tx_modem_samples( # self.sig0_datac0_freedv # ) # self.sig0_datac0_n_tx_preamble_modem_samples = ( # codec2.api.freedv_get_n_tx_preamble_modem_samples(self.sig0_datac0_freedv) # ) # self.sig0_datac0_n_tx_postamble_modem_samples = ( # codec2.api.freedv_get_n_tx_postamble_modem_samples(self.sig0_datac0_freedv) # ) # return values return c2instance, bytes_per_frame, bytes_out, audio_buffer, nin def audio_sig0_datac13(self) -> None: """Receive data encoded with datac13 - 0""" self.sig0_datac13_nin = self.demodulate_audio( self.sig0_datac13_buffer, self.sig0_datac13_nin, self.sig0_datac13_freedv, self.sig0_datac13_bytes_out, self.sig0_datac13_bytes_per_frame, SIG0_DATAC13_STATE, "sig0-datac13" ) def audio_sig1_datac13(self) -> None: """Receive data encoded with datac13 - 1""" self.sig1_datac13_nin = self.demodulate_audio( self.sig1_datac13_buffer, self.sig1_datac13_nin, self.sig1_datac13_freedv, self.sig1_datac13_bytes_out, self.sig1_datac13_bytes_per_frame, SIG1_DATAC13_STATE, "sig1-datac13" ) def audio_dat0_datac4(self) -> None: """Receive data encoded with datac4""" self.dat0_datac4_nin = self.demodulate_audio( self.dat0_datac4_buffer, self.dat0_datac4_nin, self.dat0_datac4_freedv, self.dat0_datac4_bytes_out, self.dat0_datac4_bytes_per_frame, DAT0_DATAC4_STATE, "dat0-datac4" ) def audio_dat0_datac1(self) -> None: """Receive data encoded with datac1""" self.dat0_datac1_nin = self.demodulate_audio( self.dat0_datac1_buffer, self.dat0_datac1_nin, self.dat0_datac1_freedv, self.dat0_datac1_bytes_out, self.dat0_datac1_bytes_per_frame, DAT0_DATAC1_STATE, "dat0-datac1" ) def audio_dat0_datac3(self) -> None: """Receive data encoded with datac3""" self.dat0_datac3_nin = self.demodulate_audio( self.dat0_datac3_buffer, self.dat0_datac3_nin, self.dat0_datac3_freedv, self.dat0_datac3_bytes_out, self.dat0_datac3_bytes_per_frame, DAT0_DATAC3_STATE, "dat0-datac3" ) def audio_fsk_ldpc_0(self) -> None: """Receive data encoded with FSK + LDPC0""" self.fsk_ldpc_nin_0 = self.demodulate_audio( self.fsk_ldpc_buffer_0, self.fsk_ldpc_nin_0, self.fsk_ldpc_freedv_0, self.fsk_ldpc_bytes_out_0, self.fsk_ldpc_bytes_per_frame_0, FSK_LDPC0_STATE, "fsk_ldpc0", ) def audio_fsk_ldpc_1(self) -> None: """Receive data encoded with FSK + LDPC1""" self.fsk_ldpc_nin_1 = self.demodulate_audio( self.fsk_ldpc_buffer_1, self.fsk_ldpc_nin_1, self.fsk_ldpc_freedv_1, self.fsk_ldpc_bytes_out_1, self.fsk_ldpc_bytes_per_frame_1, FSK_LDPC1_STATE, "fsk_ldpc1", ) def init_data_threads(self): # self.log.debug("[MDM] Starting worker_receive") worker_received = threading.Thread( target=self.worker_received, name="WORKER_THREAD", daemon=True ) worker_received.start() worker_transmit = threading.Thread( target=self.worker_transmit, name="WORKER_THREAD", daemon=True ) worker_transmit.start() def worker_transmit(self) -> None: """Worker for FIFO queue for processing frames to be transmitted""" while True: # print queue size for debugging purposes # TODO Lets check why we have several frames in our transmit queue which causes sometimes a double transmission # we could do a cleanup after a transmission so theres no reason sending twice queuesize = self.modem_transmit_queue.qsize() self.log.debug("[MDM] self.modem_transmit_queue", qsize=queuesize) data = self.modem_transmit_queue.get() if data[0] in ["morse"]: self.transmit_morse(repeats=data[1], repeat_delay=data[2], frames=data[3]) else: self.transmit( mode=data[0], repeats=data[1], repeat_delay=data[2], frames=data[3] ) # self.modem_transmit_queue.task_done() def worker_received(self) -> None: """Worker for FIFO queue for processing received frames""" while True: data = self.modem_received_queue.get() self.log.debug("[MDM] worker_received: received data!") # data[0] = bytes_out # data[1] = freedv session # data[2] = bytes_per_frame DATA_QUEUE_RECEIVED.put([data[0], data[1], data[2]]) self.modem_received_queue.task_done() def get_frequency_offset(self, freedv: ctypes.c_void_p) -> float: """ Ask codec2 for the calculated (audio) frequency offset of the received signal. Side-effect: sets ModemParam.frequency_offset :param freedv: codec2 instance to query :type freedv: ctypes.c_void_p :return: Offset of audio frequency in Hz :rtype: float """ modemStats = codec2.MODEMSTATS() codec2.api.freedv_get_modem_extended_stats(freedv, ctypes.byref(modemStats)) offset = round(modemStats.foff) * (-1) ModemParam.frequency_offset = offset return offset def get_scatter(self, freedv: ctypes.c_void_p) -> None: """ Ask codec2 for data about the received signal and calculate the scatter plot. Side effect: sets ModemParam.scatter :param freedv: codec2 instance to query :type freedv: ctypes.c_void_p """ if not ModemParam.enable_scatter: return modemStats = codec2.MODEMSTATS() ctypes.cast( codec2.api.freedv_get_modem_extended_stats(freedv, ctypes.byref(modemStats)), ctypes.c_void_p, ) scatterdata = [] # original function before itertool # for i in range(codec2.MODEM_STATS_NC_MAX): # for j in range(1, codec2.MODEM_STATS_NR_MAX, 2): # # print(f"{modemStats.rx_symbols[i][j]} - {modemStats.rx_symbols[i][j]}") # xsymbols = round(modemStats.rx_symbols[i][j - 1] // 1000) # ysymbols = round(modemStats.rx_symbols[i][j] // 1000) # if xsymbols != 0.0 and ysymbols != 0.0: # scatterdata.append({"x": str(xsymbols), "y": str(ysymbols)}) for i, j in itertools.product(range(codec2.MODEM_STATS_NC_MAX), range(1, codec2.MODEM_STATS_NR_MAX, 2)): # print(f"{modemStats.rx_symbols[i][j]} - {modemStats.rx_symbols[i][j]}") xsymbols = round(modemStats.rx_symbols[i][j - 1] // 1000) ysymbols = round(modemStats.rx_symbols[i][j] // 1000) if xsymbols != 0.0 and ysymbols != 0.0: scatterdata.append({"x": str(xsymbols), "y": str(ysymbols)}) # Send all the data if we have too-few samples, otherwise send a sampling if 150 > len(scatterdata) > 0: ModemParam.scatter = scatterdata else: # only take every tenth data point ModemParam.scatter = scatterdata[::10] def calculate_snr(self, freedv: ctypes.c_void_p) -> float: """ Ask codec2 for data about the received signal and calculate the signal-to-noise ratio. Side effect: sets ModemParam.snr :param freedv: codec2 instance to query :type freedv: ctypes.c_void_p :return: Signal-to-noise ratio of the decoded data :rtype: float """ try: modem_stats_snr = ctypes.c_float() modem_stats_sync = ctypes.c_int() codec2.api.freedv_get_modem_stats( freedv, ctypes.byref(modem_stats_sync), ctypes.byref(modem_stats_snr) ) modem_stats_snr = modem_stats_snr.value modem_stats_sync = modem_stats_sync.value snr = round(modem_stats_snr, 1) self.log.info("[MDM] calculate_snr: ", snr=snr) ModemParam.snr = snr # ModemParam.snr = np.clip( # snr, -127, 127 # ) # limit to max value of -128/128 as a possible fix of #188 return ModemParam.snr except Exception as err: self.log.error(f"[MDM] calculate_snr: Exception: {err}") ModemParam.snr = 0 return ModemParam.snr def init_rig_control(self): # Check how we want to control the radio if HamlibParam.hamlib_radiocontrol == "rigctld": import rigctld as rig elif HamlibParam.hamlib_radiocontrol == "tci": self.radio = self.tci_module else: import rigdummy as rig if not HamlibParam.hamlib_radiocontrol in ["tci"]: self.radio = rig.radio() self.radio.open_rig( rigctld_ip=HamlibParam.hamlib_rigctld_ip, rigctld_port=HamlibParam.hamlib_rigctld_port, ) hamlib_thread = threading.Thread( target=self.update_rig_data, name="HAMLIB_THREAD", daemon=True ) hamlib_thread.start() hamlib_set_thread = threading.Thread( target=self.set_rig_data, name="HAMLIB_SET_THREAD", daemon=True ) hamlib_set_thread.start() def set_rig_data(self) -> None: """ Set rigctld parameters like frequency, mode THis needs to be processed in a queue """ while True: cmd = RIGCTLD_COMMAND_QUEUE.get() if cmd[0] == "set_frequency": # [1] = Frequency self.radio.set_frequency(cmd[1]) if cmd[0] == "set_mode": # [1] = Mode self.radio.set_mode(cmd[1]) def update_rig_data(self) -> None: """ Request information about the current state of the radio via hamlib Side effect: sets - HamlibParam.hamlib_frequency - HamlibParam.hamlib_mode - HamlibParam.hamlib_bandwidth """ while True: try: # this looks weird, but is necessary for avoiding rigctld packet colission sock threading.Event().wait(0.25) HamlibParam.hamlib_frequency = self.radio.get_frequency() threading.Event().wait(0.1) HamlibParam.hamlib_mode = self.radio.get_mode() threading.Event().wait(0.1) HamlibParam.hamlib_bandwidth = self.radio.get_bandwidth() threading.Event().wait(0.1) HamlibParam.hamlib_status = self.radio.get_status() threading.Event().wait(0.1) if Modem.transmitting: HamlibParam.alc = self.radio.get_alc() threading.Event().wait(0.1) # HamlibParam.hamlib_rf = self.radio.get_level() # threading.Event().wait(0.1) HamlibParam.hamlib_strength = self.radio.get_strength() # print(f"ALC: {HamlibParam.alc}, RF: {HamlibParam.hamlib_rf}, STRENGTH: {HamlibParam.hamlib_strength}") except Exception as e: self.log.warning( "[MDM] error getting radio data", e=e, ) threading.Event().wait(1) def calculate_fft(self, data) -> None: """ Calculate an average signal strength of the channel to assess whether the channel is "busy." """ # Initialize dbfs counter rms_counter = 0 # https://gist.github.com/ZWMiller/53232427efc5088007cab6feee7c6e4c # Fast Fourier Transform, 10*log10(abs) is to scale it to dB # and make sure it's not imaginary try: fftarray = np.fft.rfft(data) # Set value 0 to 1 to avoid division by zero fftarray[fftarray == 0] = 1 dfft = 10.0 * np.log10(abs(fftarray)) # get average of dfft avg = np.mean(dfft) # Detect signals which are higher than the # average + 10 (+10 smoothes the output). # Data higher than the average must be a signal. # Therefore we are setting it to 100 so it will be highlighted # Have to do this when we are not transmitting so our # own sending data will not affect this too much if not Modem.transmitting: dfft[dfft > avg + 15] = 100 # Calculate audio dbfs # https://stackoverflow.com/a/9763652 # calculate dbfs every 50 cycles for reducing CPU load rms_counter += 1 if rms_counter > 50: d = np.frombuffer(data, np.int16).astype(np.float32) # calculate RMS and then dBFS # https://dsp.stackexchange.com/questions/8785/how-to-compute-dbfs # try except for avoiding runtime errors by division/0 try: rms = int(np.sqrt(np.max(d ** 2))) if rms == 0: raise ZeroDivisionError AudioParam.audio_dbfs = 20 * np.log10(rms / 32768) except Exception as e: # FIXME Disabled for cli cleanup #self.log.warning( # "[MDM] fft calculation error - please check your audio setup", # e=e, #) AudioParam.audio_dbfs = -100 rms_counter = 0 # Convert data to int to decrease size dfft = dfft.astype(int) # Create list of dfft dfftlist = dfft.tolist() # Reduce area where the busy detection is enabled # We want to have this in correlation with mode bandwidth # TODO This is not correctly and needs to be checked for correct maths # dfftlist[0:1] = 10,15Hz # Bandwidth[Hz] / 10,15 # narrowband = 563Hz = 56 # wideband = 1700Hz = 167 # 1500Hz = 148 # 2700Hz = 266 # 3200Hz = 315 # slot slot = 0 slot1 = [0, 65] slot2 = [65,120] slot3 = [120, 176] slot4 = [176, 231] slot5 = [231, len(dfftlist)] # Set to true if we should increment delay count; else false to decrement addDelay=False for range in [slot1, slot2, slot3, slot4, slot5]: range_start = range[0] range_end = range[1] # define the area, we are detecting busy state #dfft = dfft[120:176] if Modem.low_bandwidth_mode else dfft[65:231] slotdfft = dfft[range_start:range_end] # Check for signals higher than average by checking for "100" # If we have a signal, increment our channel_busy delay counter # so we have a smoother state toggle if np.sum(slotdfft[slotdfft > avg + 15]) >= 200 and not Modem.transmitting: addDelay=True self.states.channel_busy_slot[slot] = True else: self.states.channel_busy_slot[slot] = False # increment slot slot += 1 if addDelay: # Limit delay counter to a maximum of 200. The higher this value, # the longer we will wait until releasing state self.states.channel_busy = True self.channel_busy_delay = min(self.channel_busy_delay + 10, 200) else: # Decrement channel busy counter if no signal has been detected. self.channel_busy_delay = max(self.channel_busy_delay - 1, 0) # When our channel busy counter reaches 0, toggle state to False if self.channel_busy_delay == 0: self.states.channel_busy = False # erase queue if greater than 10 if self.fft_queue.qsize() >= 10: self.fft_queue = queue.Queue() self.fft_queue.put(dfftlist[:315]) # 315 --> bandwidth 3200 except Exception as err: self.log.error(f"[MDM] calculate_fft: Exception: {err}") self.log.debug("[MDM] Setting fft=0") # else 0 self.fft_queue.put([0]) def set_frames_per_burst(self, frames_per_burst: int) -> None: """ Configure codec2 to send the configured number of frames per burst. :param frames_per_burst: Number of frames per burst requested :type frames_per_burst: int """ # Limit frames per burst to acceptable values frames_per_burst = min(frames_per_burst, 1) frames_per_burst = max(frames_per_burst, 5) frames_per_burst = 1 codec2.api.freedv_set_frames_per_burst(self.dat0_datac1_freedv, frames_per_burst) codec2.api.freedv_set_frames_per_burst(self.dat0_datac3_freedv, frames_per_burst) codec2.api.freedv_set_frames_per_burst(self.dat0_datac4_freedv, frames_per_burst) codec2.api.freedv_set_frames_per_burst(self.fsk_ldpc_freedv_0, frames_per_burst) def reset_data_sync(self) -> None: """ reset sync state for data modes :param frames_per_burst: Number of frames per burst requested :type frames_per_burst: int """ codec2.api.freedv_set_sync(self.dat0_datac1_freedv, 0) codec2.api.freedv_set_sync(self.dat0_datac3_freedv, 0) codec2.api.freedv_set_sync(self.dat0_datac4_freedv, 0) codec2.api.freedv_set_sync(self.fsk_ldpc_freedv_0, 0) def open_codec2_instance(mode: int) -> ctypes.c_void_p: """ Return a codec2 instance of the type `mode` :param mode: Type of codec2 instance to return :type mode: Union[int, str] :return: C-function of the requested codec2 instance :rtype: ctypes.c_void_p """ if mode in [codec2.FREEDV_MODE.fsk_ldpc_0.value]: return ctypes.cast( codec2.api.freedv_open_advanced( codec2.FREEDV_MODE.fsk_ldpc.value, ctypes.byref(codec2.api.FREEDV_MODE_FSK_LDPC_0_ADV), ), ctypes.c_void_p, ) if mode in [codec2.FREEDV_MODE.fsk_ldpc_1.value]: return ctypes.cast( codec2.api.freedv_open_advanced( codec2.FREEDV_MODE.fsk_ldpc.value, ctypes.byref(codec2.api.FREEDV_MODE_FSK_LDPC_1_ADV), ), ctypes.c_void_p, ) return ctypes.cast(codec2.api.freedv_open(mode), ctypes.c_void_p) def get_bytes_per_frame(mode: int) -> int: """ Provide bytes per frame information for accessing from data handler :param mode: Codec2 mode to query :type mode: int or str :return: Bytes per frame of the supplied codec2 data mode :rtype: int """ freedv = open_codec2_instance(mode) # TODO add close session # get number of bytes per frame for mode return int(codec2.api.freedv_get_bits_per_modem_frame(freedv) / 8) def set_audio_volume(datalist: np.ndarray, dB: float) -> np.ndarray: """ Scale values for the provided audio samples by dB. :param datalist: Audio samples to scale :type datalist: np.ndarray :param dB: Decibels to scale samples, constrained to the range [-50, 50] :type dB: float :return: Scaled audio samples :rtype: np.ndarray """ try: dB = float(dB) except ValueError as e: print(f"[MDM] Changing audio volume failed with error: {e}") dB = 0.0 # 0 dB means no change # Clip dB value to the range [-50, 50] dB = np.clip(dB, -30, 20) # Ensure datalist is an np.ndarray if not isinstance(datalist, np.ndarray): print("[MDM] Invalid data type for datalist. Expected np.ndarray.") return datalist # Convert dB to linear scale scale_factor = 10 ** (dB / 20) # Scale samples scaled_data = datalist * scale_factor # Clip values to int16 range and convert data type return np.clip(scaled_data, -32768, 32767).astype(np.int16) def get_modem_error_state(): """ get current state buffer and return True of contains 10 """ if RECEIVE_DATAC1 and 10 in DAT0_DATAC1_STATE: DAT0_DATAC1_STATE.clear() return True if RECEIVE_DATAC3 and 10 in DAT0_DATAC3_STATE: DAT0_DATAC3_STATE.clear() return True if RECEIVE_DATAC4 and 10 in DAT0_DATAC4_STATE: DAT0_DATAC4_STATE.clear() return True return False