FreeDATA/tnc/codec2.py

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import ctypes
from ctypes import *
import sys
import os
from enum import Enum
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import numpy as np
from threading import Lock
import glob
import structlog
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# Enum for codec2 modes
class FREEDV_MODE(Enum):
"""
enum for codec2 modes and names
"""
fsk_ldpc_0 = 200
fsk_ldpc_1 = 201
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fsk_ldpc = 9
datac0 = 14
datac1 = 10
datac3 = 12
allmodes = 255
# function for returning the mode value
def freedv_get_mode_value_by_name(mode):
"""
get the codec2 mode by entering its string
Args:
mode:
Returns: int
"""
return FREEDV_MODE[mode].value
# function for returning the mode name
def freedv_get_mode_name_by_value(mode):
"""
get the codec2 mode name as string
Args:
mode:
Returns: string
"""
return FREEDV_MODE(mode).name
# check if we are running in a pyinstaller environment
try:
app_path = sys._MEIPASS
except:
app_path = os.path.abspath(".")
sys.path.append(app_path)
structlog.get_logger("structlog").info("[C2 ] Searching for libcodec2...")
if sys.platform == 'linux':
files = glob.glob('**/*libcodec2*',recursive=True)
files.append('libcodec2.so')
elif sys.platform == 'darwin':
files = glob.glob('**/*libcodec2*.dylib',recursive=True)
elif sys.platform == 'win32' or sys.platform == 'win64':
files = glob.glob('**\*libcodec2*.dll',recursive=True)
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else:
files = []
for file in files:
try:
api = ctypes.CDLL(file)
structlog.get_logger("structlog").info("[C2 ] Libcodec2 loaded", path=file)
break
except Exception as e:
structlog.get_logger("structlog").warning("[C2 ] Libcodec2 found but not loaded", path=file, e=e)
# quit module if codec2 cant be loaded
if not 'api' in locals():
structlog.get_logger("structlog").critical("[C2 ] Libcodec2 not loaded", path=file)
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os._exit(1)
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# ctypes function init
#api.freedv_set_tuning_range.restype = c_int
#api.freedv_set_tuning_range.argype = [c_void_p, c_float, c_float]
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api.freedv_open.argype = [c_int]
api.freedv_open.restype = c_void_p
api.freedv_open_advanced.argtype = [c_int, c_void_p]
api.freedv_open_advanced.restype = c_void_p
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api.freedv_get_bits_per_modem_frame.argtype = [c_void_p]
api.freedv_get_bits_per_modem_frame.restype = c_int
api.freedv_nin.argtype = [c_void_p]
api.freedv_nin.restype = c_int
api.freedv_rawdatarx.argtype = [c_void_p, c_char_p, c_char_p]
api.freedv_rawdatarx.restype = c_int
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api.freedv_rawdatatx.argtype = [c_void_p, c_char_p, c_char_p]
api.freedv_rawdatatx.restype = c_int
api.freedv_rawdatapostambletx.argtype = [c_void_p, c_char_p, c_char_p]
api.freedv_rawdatapostambletx.restype = c_int
api.freedv_rawdatapreambletx.argtype = [c_void_p, c_char_p, c_char_p]
api.freedv_rawdatapreambletx.restype = c_int
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api.freedv_get_n_max_modem_samples.argtype = [c_void_p]
api.freedv_get_n_max_modem_samples.restype = c_int
api.freedv_set_frames_per_burst.argtype = [c_void_p, c_int]
api.freedv_set_frames_per_burst.restype = c_void_p
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api.freedv_get_rx_status.argtype = [c_void_p]
api.freedv_get_rx_status.restype = c_int
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api.freedv_get_modem_stats.argtype = [c_void_p, c_void_p, c_void_p]
api.freedv_get_modem_stats.restype = c_int
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api.freedv_get_n_tx_postamble_modem_samples.argtype = [c_void_p]
api.freedv_get_n_tx_postamble_modem_samples.restype = c_int
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api.freedv_get_n_tx_preamble_modem_samples.argtype = [c_void_p]
api.freedv_get_n_tx_preamble_modem_samples.restype = c_int
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api.freedv_get_n_tx_modem_samples.argtype = [c_void_p]
api.freedv_get_n_tx_modem_samples.restype = c_int
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api.freedv_get_n_max_modem_samples.argtype = [c_void_p]
api.freedv_get_n_max_modem_samples.restype = c_int
api.FREEDV_FS_8000 = 8000
api.FREEDV_MODE_DATAC1 = 10
api.FREEDV_MODE_DATAC3 = 12
api.FREEDV_MODE_DATAC0 = 14
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api.FREEDV_MODE_FSK_LDPC = 9
# -------------------------------- FSK LDPC MODE SETTINGS
# advanced structure for fsk modes
class ADVANCED(ctypes.Structure):
""" """
_fields_ = [
("interleave_frames", ctypes.c_int),
("M", ctypes.c_int),
("Rs", ctypes.c_int),
("Fs", ctypes.c_int),
("first_tone", ctypes.c_int),
("tone_spacing", ctypes.c_int),
("codename", ctypes.c_char_p),
]
'''
adv.interleave_frames = 0 # max amplitude
adv.M = 2 # number of fsk tones 2/4
adv.Rs = 100 # symbol rate
adv.Fs = 8000 # sample rate
adv.first_tone = 1500 # first tone freq
adv.tone_spacing = 200 # shift between tones
adv.codename = 'H_128_256_5'.encode('utf-8') # code word
HRA_112_112 rate 0.50 (224,112) BPF: 14 not working
HRA_56_56 rate 0.50 (112,56) BPF: 7 not working
H_2064_516_sparse rate 0.80 (2580,2064) BPF: 258 working
HRAb_396_504 rate 0.79 (504,396) BPF: 49 not working
H_256_768_22 rate 0.33 (768,256) BPF: 32 working
H_256_512_4 rate 0.50 (512,256) BPF: 32 working
HRAa_1536_512 rate 0.75 (2048,1536) BPF: 192 not working
H_128_256_5 rate 0.50 (256,128) BPF: 16 working
H_4096_8192_3d rate 0.50 (8192,4096) BPF: 512 not working
H_16200_9720 rate 0.60 (16200,9720) BPF: 1215 not working
H_1024_2048_4f rate 0.50 (2048,1024) BPF: 128 working
'''
# --------------- 2 FSK H_128_256_5, 16 bytes
api.FREEDV_MODE_FSK_LDPC_0_ADV = ADVANCED()
api.FREEDV_MODE_FSK_LDPC_0_ADV.interleave_frames = 0
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api.FREEDV_MODE_FSK_LDPC_0_ADV.M = 4
api.FREEDV_MODE_FSK_LDPC_0_ADV.Rs = 100
api.FREEDV_MODE_FSK_LDPC_0_ADV.Fs = 8000
api.FREEDV_MODE_FSK_LDPC_0_ADV.first_tone = 1400 # 1150 4fsk, 1500 2fsk
api.FREEDV_MODE_FSK_LDPC_0_ADV.tone_spacing = 120 #200
api.FREEDV_MODE_FSK_LDPC_0_ADV.codename = 'H_128_256_5'.encode('utf-8') # code word
# --------------- 4 H_256_512_4, 7 bytes
api.FREEDV_MODE_FSK_LDPC_1_ADV = ADVANCED()
api.FREEDV_MODE_FSK_LDPC_1_ADV.interleave_frames = 0
api.FREEDV_MODE_FSK_LDPC_1_ADV.M = 4
api.FREEDV_MODE_FSK_LDPC_1_ADV.Rs = 100
api.FREEDV_MODE_FSK_LDPC_1_ADV.Fs = 8000
api.FREEDV_MODE_FSK_LDPC_1_ADV.first_tone = 1250 # 1250 4fsk, 1500 2fsk
api.FREEDV_MODE_FSK_LDPC_1_ADV.tone_spacing = 200
api.FREEDV_MODE_FSK_LDPC_1_ADV.codename = 'H_256_512_4'.encode('utf-8') # code word
# ------- MODEM STATS STRUCTURES
MODEM_STATS_NC_MAX = 50+1
MODEM_STATS_NR_MAX = 160
MODEM_STATS_ET_MAX = 8
MODEM_STATS_EYE_IND_MAX = 160
MODEM_STATS_NSPEC = 512
MODEM_STATS_MAX_F_HZ = 4000
MODEM_STATS_MAX_F_EST = 4
# modem stats structure
class MODEMSTATS(ctypes.Structure):
""" """
_fields_ = [
("Nc", ctypes.c_int),
("snr_est", ctypes.c_float),
("rx_symbols", (ctypes.c_float * MODEM_STATS_NR_MAX)*MODEM_STATS_NC_MAX),
("nr", ctypes.c_int),
("sync", ctypes.c_int),
("foff", ctypes.c_float),
("rx_timing", ctypes.c_float),
("clock_offset", ctypes.c_float),
("sync_metric", ctypes.c_float),
("pre", ctypes.c_int),
("post", ctypes.c_int),
("uw_fails", ctypes.c_int),
("neyetr", ctypes.c_int), # How many eye traces are plotted
("neyesamp", ctypes.c_int), # How many samples in the eye diagram
("f_est", (ctypes.c_float * MODEM_STATS_MAX_F_EST)), # How many samples in the eye diagram
("fft_buf", (ctypes.c_float * MODEM_STATS_NSPEC * 2)),
]
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# Return code flags for freedv_get_rx_status() function
api.FREEDV_RX_TRIAL_SYNC = 0x1 # demodulator has trial sync
api.FREEDV_RX_SYNC = 0x2 # demodulator has sync
api.FREEDV_RX_BITS = 0x4 # data bits have been returned
api.FREEDV_RX_BIT_ERRORS = 0x8 # FEC may not have corrected all bit errors (not all parity checks OK)
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api.rx_sync_flags_to_text = [
"----",
"---T",
"--S-",
"--ST",
"-B--",
"-B-T",
"-BS-",
"-BST",
"E---",
"E--T",
"E-S-",
"E-ST",
"EB--",
"EB-T",
"EBS-",
"EBST"]
# audio buffer ---------------------------------------------------------
class audio_buffer:
"""
thread safe audio buffer, which fits to needs of codec2
made by David Rowe, VK5DGR
"""
# a buffer of int16 samples, using a fixed length numpy array self.buffer for storage
# self.nbuffer is the current number of samples in the buffer
def __init__(self, size):
structlog.get_logger("structlog").debug("[C2 ] creating audio buffer", size=size)
self.size = size
self.buffer = np.zeros(size, dtype=np.int16)
self.nbuffer = 0
self.mutex = Lock()
def push(self,samples):
"""
Push new data to buffer
Args:
samples:
Returns:
"""
self.mutex.acquire()
# add samples at the end of the buffer
assert self.nbuffer+len(samples) <= self.size
self.buffer[self.nbuffer:self.nbuffer+len(samples)] = samples
self.nbuffer += len(samples)
self.mutex.release()
def pop(self,size):
"""
get data from buffer in size of NIN
Args:
size:
Returns:
"""
self.mutex.acquire()
# remove samples from the start of the buffer
self.nbuffer -= size;
self.buffer[:self.nbuffer] = self.buffer[size:size+self.nbuffer]
assert self.nbuffer >= 0
self.mutex.release()
# resampler ---------------------------------------------------------
api.FDMDV_OS_48 = int(6) # oversampling rate
api.FDMDV_OS_TAPS_48K = int(48) # number of OS filter taps at 48kHz
api.FDMDV_OS_TAPS_48_8K = int(api.FDMDV_OS_TAPS_48K/api.FDMDV_OS_48) # number of OS filter taps at 8kHz
api.fdmdv_8_to_48_short.argtype = [c_void_p, c_void_p, c_int]
api.fdmdv_48_to_8_short.argtype = [c_void_p, c_void_p, c_int]
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class resampler:
"""
resampler class
"""
# resample an array of variable length, we just store the filter memories here
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MEM8 = api.FDMDV_OS_TAPS_48_8K
MEM48 = api.FDMDV_OS_TAPS_48K
def __init__(self):
structlog.get_logger("structlog").debug("[C2 ] create 48<->8 kHz resampler")
self.filter_mem8 = np.zeros(self.MEM8, dtype=np.int16)
self.filter_mem48 = np.zeros(self.MEM48)
def resample48_to_8(self,in48):
"""
audio resampler integration from codec2
downsample audio from 48000Hz to 8000Hz
Args:
in48: input data as np.int16
Returns: downsampled 8000Hz data as np.int16
"""
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assert in48.dtype == np.int16
# length of input vector must be an integer multiple of api.FDMDV_OS_48
assert(len(in48) % api.FDMDV_OS_48 == 0)
# concat filter memory and input samples
in48_mem = np.zeros(self.MEM48+len(in48), dtype=np.int16)
in48_mem[:self.MEM48] = self.filter_mem48
in48_mem[self.MEM48:] = in48
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# In C: pin48=&in48_mem[MEM48]
pin48 = byref(np.ctypeslib.as_ctypes(in48_mem), 2*self.MEM48)
n8 = int(len(in48) / api.FDMDV_OS_48)
out8 = np.zeros(n8, dtype=np.int16)
api.fdmdv_48_to_8_short(out8.ctypes, pin48, n8);
# store memory for next time
self.filter_mem48 = in48_mem[:self.MEM48]
return out8
def resample8_to_48(self,in8):
"""
audio resampler integration from codec2
resample audio from 8000Hz to 48000Hz
Args:
in8: input data as np.int16
Returns: 48000Hz audio as np.int16
"""
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assert in8.dtype == np.int16
# concat filter memory and input samples
in8_mem = np.zeros(self.MEM8+len(in8), dtype=np.int16)
in8_mem[:self.MEM8] = self.filter_mem8
in8_mem[self.MEM8:] = in8
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# In C: pin8=&in8_mem[MEM8]
pin8 = byref(np.ctypeslib.as_ctypes(in8_mem), 2*self.MEM8)
out48 = np.zeros(api.FDMDV_OS_48*len(in8), dtype=np.int16)
api.fdmdv_8_to_48_short(out48.ctypes, pin8, len(in8));
# store memory for next time
self.filter_mem8 = in8_mem[:self.MEM8]
return out48