mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 10:04:33 +02:00
388 lines
15 KiB
Python
388 lines
15 KiB
Python
import numpy as np
|
|
import codec2
|
|
import ctypes
|
|
import structlog
|
|
import threading
|
|
import audio
|
|
import os
|
|
from modem_frametypes import FRAME_TYPE
|
|
import itertools
|
|
from time import sleep
|
|
|
|
TESTMODE = False
|
|
|
|
class Demodulator():
|
|
|
|
MODE_DICT = {}
|
|
# Iterate over the FREEDV_MODE enum members
|
|
for mode in codec2.FREEDV_MODE:
|
|
MODE_DICT[mode.value] = {
|
|
'decode': False,
|
|
'bytes_per_frame': None,
|
|
'bytes_out': None,
|
|
'audio_buffer': None,
|
|
'nin': None,
|
|
'instance': None,
|
|
'state_buffer': [],
|
|
'name': mode.name.upper(),
|
|
'decoding_thread': None
|
|
}
|
|
|
|
def __init__(self, config, audio_rx_q, data_q_rx, states, event_manager, fft_queue):
|
|
self.log = structlog.get_logger("Demodulator")
|
|
|
|
self.rx_audio_level = config['AUDIO']['rx_audio_level']
|
|
|
|
self.AUDIO_FRAMES_PER_BUFFER_RX = 4800
|
|
self.buffer_overflow_counter = [0, 0, 0, 0, 0, 0, 0, 0]
|
|
self.is_codec2_traffic_counter = 0
|
|
self.is_codec2_traffic_cooldown = 5
|
|
|
|
self.audio_received_queue = audio_rx_q
|
|
self.data_queue_received = data_q_rx
|
|
|
|
self.states = states
|
|
self.event_manager = event_manager
|
|
|
|
self.fft_queue = fft_queue
|
|
|
|
# init codec2 resampler
|
|
self.resampler = codec2.resampler()
|
|
|
|
self.init_codec2()
|
|
|
|
# enable decoding of signalling modes
|
|
self.MODE_DICT[codec2.FREEDV_MODE.signalling.value]["decode"] = True
|
|
|
|
tci_rx_callback_thread = threading.Thread(
|
|
target=self.tci_rx_callback,
|
|
name="TCI RX CALLBACK THREAD",
|
|
daemon=True,
|
|
)
|
|
tci_rx_callback_thread.start()
|
|
|
|
def init_codec2(self):
|
|
# Open codec2 instances
|
|
for mode in codec2.FREEDV_MODE:
|
|
self.init_codec2_mode(mode.value)
|
|
|
|
|
|
def init_codec2_mode(self, mode):
|
|
"""
|
|
Init codec2 and return some important parameters
|
|
"""
|
|
|
|
# create codec2 instance
|
|
c2instance = ctypes.cast(
|
|
codec2.api.freedv_open(mode), ctypes.c_void_p
|
|
)
|
|
|
|
# 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.signalling_datac0_payload_per_frame = self.signalling_datac0_bytes_per_frame - 2
|
|
# self.signalling_datac0_n_nom_modem_samples = codec2.api.freedv_get_n_nom_modem_samples(
|
|
# self.signalling_datac0_freedv
|
|
# )
|
|
# self.signalling_datac0_n_tx_modem_samples = codec2.api.freedv_get_n_tx_modem_samples(
|
|
# self.signalling_datac0_freedv
|
|
# )
|
|
# self.signalling_datac0_n_tx_preamble_modem_samples = (
|
|
# codec2.api.freedv_get_n_tx_preamble_modem_samples(self.signalling_datac0_freedv)
|
|
# )
|
|
# self.signalling_datac0_n_tx_postamble_modem_samples = (
|
|
# codec2.api.freedv_get_n_tx_postamble_modem_samples(self.signalling_datac0_freedv)
|
|
# )
|
|
|
|
self.MODE_DICT[mode]["instance"] = c2instance
|
|
self.MODE_DICT[mode]["bytes_per_frame"] = bytes_per_frame
|
|
self.MODE_DICT[mode]["bytes_out"] = bytes_out
|
|
self.MODE_DICT[mode]["audio_buffer"] = audio_buffer
|
|
self.MODE_DICT[mode]["nin"] = nin
|
|
|
|
def start(self, stream):
|
|
|
|
self.stream = stream
|
|
|
|
for mode in self.MODE_DICT:
|
|
# Start decoder threads
|
|
self.MODE_DICT[mode]['decoding_thread'] = threading.Thread(
|
|
target=self.demodulate_audio,args=[mode], name=self.MODE_DICT[mode]['name'], daemon=True
|
|
)
|
|
self.MODE_DICT[mode]['decoding_thread'].start()
|
|
|
|
def sd_input_audio_callback(self, indata: np.ndarray, frames: int, time, status) -> None:
|
|
if status:
|
|
self.log.warning("[AUDIO STATUS]", status=status, time=time, frames=frames)
|
|
return
|
|
try:
|
|
audio_48k = np.frombuffer(indata, dtype=np.int16)
|
|
audio_8k = self.resampler.resample48_to_8(audio_48k)
|
|
|
|
audio_8k_level_adjusted = audio.set_audio_volume(audio_8k, self.rx_audio_level)
|
|
audio.calculate_fft(audio_8k_level_adjusted, self.fft_queue, self.states)
|
|
|
|
length_audio_8k_level_adjusted = len(audio_8k_level_adjusted)
|
|
# Avoid buffer overflow by filling only if buffer for
|
|
# selected datachannel mode is not full
|
|
index = 0
|
|
for mode in self.MODE_DICT:
|
|
mode_data = self.MODE_DICT[mode]
|
|
audiobuffer = mode_data['audio_buffer']
|
|
decode = mode_data['decode']
|
|
index += 1
|
|
if audiobuffer:
|
|
if (audiobuffer.nbuffer + length_audio_8k_level_adjusted) > audiobuffer.size:
|
|
self.buffer_overflow_counter[index] += 1
|
|
self.event_manager.send_buffer_overflow(self.buffer_overflow_counter)
|
|
elif decode:
|
|
audiobuffer.push(audio_8k_level_adjusted)
|
|
except Exception as e:
|
|
self.log.warning("[AUDIO EXCEPTION]", status=status, time=time, frames=frames, e=e)
|
|
|
|
|
|
def get_frequency_offset(self, freedv: ctypes.c_void_p) -> float:
|
|
"""
|
|
Ask codec2 for the calculated (audio) frequency offset of the received signal.
|
|
|
|
: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)
|
|
return offset
|
|
|
|
def demodulate_audio(self, mode) -> int:
|
|
"""
|
|
De-modulate supplied audio stream with supplied codec2 instance.
|
|
Decoded audio is placed into `bytes_out`.
|
|
"""
|
|
|
|
audiobuffer = self.MODE_DICT[mode]["audio_buffer"]
|
|
nin = self.MODE_DICT[mode]["nin"]
|
|
freedv = self.MODE_DICT[mode]["instance"]
|
|
bytes_out = self.MODE_DICT[mode]["bytes_out"]
|
|
bytes_per_frame= self.MODE_DICT[mode]["bytes_per_frame"]
|
|
state_buffer = self.MODE_DICT[mode]["state_buffer"]
|
|
mode_name = self.MODE_DICT[mode]["name"]
|
|
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]:
|
|
self.is_codec2_traffic_counter = self.is_codec2_traffic_cooldown
|
|
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]
|
|
)
|
|
|
|
# decrement codec traffic counter for making state smoother
|
|
if self.is_codec2_traffic_counter > 0:
|
|
self.is_codec2_traffic_counter -= 1
|
|
self.states.set_channel_busy_condition_codec2(True)
|
|
else:
|
|
self.states.set_channel_busy_condition_codec2(False)
|
|
if rx_status == 10:
|
|
state_buffer.append(rx_status)
|
|
|
|
audiobuffer.pop(nin)
|
|
nin = codec2.api.freedv_nin(freedv)
|
|
if nbytes == bytes_per_frame:
|
|
self.log.debug(
|
|
"[MDM] [demod_audio] Pushing received data to received_queue", nbytes=nbytes
|
|
)
|
|
snr = self.calculate_snr(freedv)
|
|
self.get_scatter(freedv)
|
|
|
|
item = {
|
|
'payload': bytes_out,
|
|
'freedv': freedv,
|
|
'bytes_per_frame': bytes_per_frame,
|
|
'snr': snr,
|
|
'frequency_offset': self.get_frequency_offset(freedv),
|
|
}
|
|
self.data_queue_received.put(item)
|
|
|
|
|
|
state_buffer = []
|
|
except Exception as e:
|
|
error_message = str(e)
|
|
# we expect this error when shutdown
|
|
if "PortAudio not initialized" in error_message:
|
|
e = None
|
|
self.log.debug(
|
|
"[MDM] [demod_audio] demod loop ended", mode=mode_name, e=e
|
|
)
|
|
|
|
def tci_rx_callback(self) -> None:
|
|
"""
|
|
Callback for TCI RX
|
|
|
|
data_in48k must be filled with 48000Hz audio raw data
|
|
|
|
"""
|
|
|
|
while True:
|
|
|
|
audio_48k = self.audio_received_queue.get()
|
|
audio_48k = np.frombuffer(audio_48k, dtype=np.int16)
|
|
|
|
audio.calculate_fft(audio_48k, self.fft_queue, self.states)
|
|
|
|
length_audio_48k = len(audio_48k)
|
|
index = 0
|
|
for mode in self.MODE_DICT:
|
|
mode_data = self.MODE_DICT[mode]
|
|
audiobuffer = mode_data['audio_buffer']
|
|
decode = mode_data['decode']
|
|
index += 1
|
|
if audiobuffer:
|
|
if (audiobuffer.nbuffer + length_audio_48k) > audiobuffer.size:
|
|
self.buffer_overflow_counter[index] += 1
|
|
self.event_manager.send_buffer_overflow(self.buffer_overflow_counter)
|
|
elif decode:
|
|
audiobuffer.push(audio_48k)
|
|
|
|
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)
|
|
|
|
# FIXME
|
|
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)
|
|
|
|
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.
|
|
|
|
: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)
|
|
# snr = np.clip(
|
|
# snr, -127, 127
|
|
# ) # limit to max value of -128/128 as a possible fix of #188
|
|
return int(snr)
|
|
except Exception as err:
|
|
self.log.error(f"[MDM] calculate_snr: Exception: {err}")
|
|
return 0
|
|
|
|
def get_scatter(self, freedv: ctypes.c_void_p) -> None:
|
|
"""
|
|
Ask codec2 for data about the received signal and calculate the scatter plot.
|
|
|
|
:param freedv: codec2 instance to query
|
|
:type freedv: ctypes.c_void_p
|
|
"""
|
|
|
|
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:
|
|
self.event_manager.send_scatter_change(scatterdata)
|
|
|
|
else:
|
|
# only take every tenth data point
|
|
self.event_manager.send_scatter_change(scatterdata[::10])
|
|
|
|
def reset_data_sync(self) -> None:
|
|
"""
|
|
reset sync state for modes
|
|
|
|
:param frames_per_burst: Number of frames per burst requested
|
|
:type frames_per_burst: int
|
|
"""
|
|
for mode in self.MODE_DICT:
|
|
codec2.api.freedv_set_sync(self.MODE_DICT[mode]["instance"], 0)
|
|
|
|
def set_decode_mode(self, modes_to_decode):
|
|
# Reset all modes to not decode
|
|
for m in self.MODE_DICT:
|
|
self.MODE_DICT[m]["decode"] = False
|
|
|
|
# signalling is always true
|
|
self.MODE_DICT[codec2.FREEDV_MODE.signalling.value]["decode"] = True
|
|
|
|
# lowest speed level is alwys true
|
|
self.MODE_DICT[codec2.FREEDV_MODE.datac4.value]["decode"] = True
|
|
|
|
# Enable specified modes
|
|
for mode, decode in modes_to_decode.items():
|
|
if mode in self.MODE_DICT:
|
|
self.MODE_DICT[mode]["decode"] = decode
|