FreeDATA/modem/codec2.py

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"""
Python interface to the C-language codec2 library.
"""
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# -*- coding: utf-8 -*-
# pylint: disable=invalid-name, line-too-long, c-extension-no-member
# pylint: disable=import-outside-toplevel, attribute-defined-outside-init
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import ctypes
import glob
import os
import sys
from enum import Enum
from threading import Lock
import numpy as np
import structlog
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log = structlog.get_logger("codec2")
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# Enum for codec2 modes
class FREEDV_MODE(Enum):
"""
Enumeration for codec2 modes and names
"""
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signalling = 19
datac0 = 14
datac1 = 10
datac3 = 12
datac4 = 18
datac13 = 19
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class FREEDV_MODE_USED_SLOTS(Enum):
"""
Enumeration for codec2 used slots
"""
sig0 = [False, False, True, False, False]
sig1 = [False, False, True, False, False]
datac0 = [False, False, True, False, False]
datac1 = [False, True, True, True, False]
datac3 = [False, False, True, False, False]
datac4 = [False, False, True, False, False]
datac13 = [False, False, True, False, False]
fsk_ldpc = [False, False, True, False, False]
fsk_ldpc_0 = [False, False, True, False, False]
fsk_ldpc_1 = [False, False, True, False, False]
# Function for returning the mode value
def freedv_get_mode_value_by_name(mode: str) -> int:
"""
Get the codec2 mode by entering its string
Args:
mode: String representation of the codec2 mode.
Returns:
int
"""
return FREEDV_MODE[mode.lower()].value
# Function for returning the mode name
def freedv_get_mode_name_by_value(mode: int) -> str:
"""
Get the codec2 mode name as string
Args:
mode: Integer value of the codec2 mode.
Returns:
string
"""
return FREEDV_MODE(mode).name
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# Check if we are running in a pyinstaller environment
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#if hasattr(sys, "_MEIPASS"):
# sys.path.append(getattr(sys, "_MEIPASS"))
#else:
sys.path.append(os.path.abspath("."))
#log.info("[C2 ] Searching for libcodec2...")
if sys.platform == "linux":
files = glob.glob(r"**/*libcodec2*", recursive=True)
files.append("libcodec2.so")
elif sys.platform == "darwin":
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if hasattr(sys, "_MEIPASS"):
files = glob.glob(getattr(sys, "_MEIPASS") + '/**/*libcodec2*', recursive=True)
else:
files = glob.glob(r"**/*libcodec2*.dylib", recursive=True)
elif sys.platform in ["win32", "win64"]:
files = glob.glob(r"**\*libcodec2*.dll", recursive=True)
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else:
files = []
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api = None
for file in files:
try:
api = ctypes.CDLL(file)
#log.info("[C2 ] Libcodec2 loaded", path=file)
break
except OSError as err:
log.warning("[C2 ] Error: Libcodec2 found but not loaded", path=file, e=err)
# Quit module if codec2 cant be loaded
if api is None or "api" not in locals():
log.critical("[C2 ] Error: Libcodec2 not loaded - Exiting")
sys.exit(1)
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# ctypes function init
# api.freedv_set_tuning_range.restype = ctypes.c_int
# api.freedv_set_tuning_range.argype = [ctypes.c_void_p, ctypes.c_float, ctypes.c_float]
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api.freedv_open.argype = [ctypes.c_int] # type: ignore
api.freedv_open.restype = ctypes.c_void_p
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api.freedv_set_sync.argype = [ctypes.c_void_p, ctypes.c_int] # type: ignore
api.freedv_set_sync.restype = ctypes.c_void_p
api.freedv_open_advanced.argtype = [ctypes.c_int, ctypes.c_void_p] # type: ignore
api.freedv_open_advanced.restype = ctypes.c_void_p
api.freedv_get_bits_per_modem_frame.argtype = [ctypes.c_void_p] # type: ignore
api.freedv_get_bits_per_modem_frame.restype = ctypes.c_int
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api.freedv_get_modem_extended_stats.argtype = [ctypes.c_void_p, ctypes.c_void_p]
api.freedv_get_modem_extended_stats.restype = ctypes.c_int
api.freedv_nin.argtype = [ctypes.c_void_p] # type: ignore
api.freedv_nin.restype = ctypes.c_int
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api.freedv_rawdatarx.argtype = [ctypes.c_void_p, ctypes.c_char_p, ctypes.c_char_p] # type: ignore
api.freedv_rawdatarx.restype = ctypes.c_int
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api.freedv_rawdatatx.argtype = [ctypes.c_void_p, ctypes.c_char_p, ctypes.c_char_p] # type: ignore
api.freedv_rawdatatx.restype = ctypes.c_int
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api.freedv_rawdatapostambletx.argtype = [ctypes.c_void_p, ctypes.c_char_p, ctypes.c_char_p] # type: ignore
api.freedv_rawdatapostambletx.restype = ctypes.c_int
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api.freedv_rawdatapreambletx.argtype = [ctypes.c_void_p, ctypes.c_char_p, ctypes.c_char_p] # type: ignore
api.freedv_rawdatapreambletx.restype = ctypes.c_int
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api.freedv_get_n_max_modem_samples.argtype = [ctypes.c_void_p] # type: ignore
api.freedv_get_n_max_modem_samples.restype = ctypes.c_int
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api.freedv_set_frames_per_burst.argtype = [ctypes.c_void_p, ctypes.c_int] # type: ignore
api.freedv_set_frames_per_burst.restype = ctypes.c_void_p
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api.freedv_get_rx_status.argtype = [ctypes.c_void_p] # type: ignore
api.freedv_get_rx_status.restype = ctypes.c_int
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api.freedv_get_modem_stats.argtype = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p] # type: ignore
api.freedv_get_modem_stats.restype = ctypes.c_int
api.freedv_get_n_tx_postamble_modem_samples.argtype = [ctypes.c_void_p] # type: ignore
api.freedv_get_n_tx_postamble_modem_samples.restype = ctypes.c_int
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api.freedv_get_n_tx_preamble_modem_samples.argtype = [ctypes.c_void_p] # type: ignore
api.freedv_get_n_tx_preamble_modem_samples.restype = ctypes.c_int
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api.freedv_get_n_tx_modem_samples.argtype = [ctypes.c_void_p] # type: ignore
api.freedv_get_n_tx_modem_samples.restype = ctypes.c_int
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api.freedv_get_n_max_modem_samples.argtype = [ctypes.c_void_p] # type: ignore
api.freedv_get_n_max_modem_samples.restype = ctypes.c_int
api.FREEDV_FS_8000 = 8000 # type: ignore
# -------------------------------- FSK LDPC MODE SETTINGS
class ADVANCED(ctypes.Structure):
"""Advanced structure for fsk modes"""
_fields_ = [
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("interleave_frames", ctypes.c_int),
("M", ctypes.c_int),
("Rs", ctypes.c_int),
("Fs", ctypes.c_int),
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("first_tone", ctypes.c_int),
("tone_spacing", ctypes.c_int),
("codename", ctypes.c_char_p),
]
# pylint: disable=pointless-string-statement
"""
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() # type: ignore
api.FREEDV_MODE_FSK_LDPC_0_ADV.interleave_frames = 0
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api.FREEDV_MODE_FSK_LDPC_0_ADV.M = 4
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api.FREEDV_MODE_FSK_LDPC_0_ADV.Rs = 500
api.FREEDV_MODE_FSK_LDPC_0_ADV.Fs = 8000
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api.FREEDV_MODE_FSK_LDPC_0_ADV.first_tone = 1150 # 1150 4fsk, 1500 2fsk
api.FREEDV_MODE_FSK_LDPC_0_ADV.tone_spacing = 200 # 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() # type: ignore
api.FREEDV_MODE_FSK_LDPC_1_ADV.interleave_frames = 0
api.FREEDV_MODE_FSK_LDPC_1_ADV.M = 4
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api.FREEDV_MODE_FSK_LDPC_1_ADV.Rs = 1000
api.FREEDV_MODE_FSK_LDPC_1_ADV.Fs = 8000
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api.FREEDV_MODE_FSK_LDPC_1_ADV.first_tone = 1150 # 1250 4fsk, 1500 2fsk
api.FREEDV_MODE_FSK_LDPC_1_ADV.tone_spacing = 200
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api.FREEDV_MODE_FSK_LDPC_1_ADV.codename = "H_4096_8192_3d".encode("utf-8") # code word
# ------- MODEM STATS STRUCTURES
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MODEM_STATS_NC_MAX = 50 + 1 * 2
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MODEM_STATS_NR_MAX = 320 * 2
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
class MODEMSTATS(ctypes.Structure):
"""Modem statistics 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),
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("rx_eye", (ctypes.c_float * MODEM_STATS_ET_MAX) * MODEM_STATS_EYE_IND_MAX),
("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)),
("fft_buf", (ctypes.c_float * MODEM_STATS_NSPEC * 2)),
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("fft_cfg", ctypes.c_void_p)
]
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# Return code flags for freedv_get_rx_status() function
api.FREEDV_RX_TRIAL_SYNC = 0x1 # type: ignore # demodulator has trial sync
api.FREEDV_RX_SYNC = 0x2 # type: ignore # demodulator has sync
api.FREEDV_RX_BITS = 0x4 # type: ignore # data bits have been returned
api.FREEDV_RX_BIT_ERRORS = 0x8 # type: ignore # FEC may not have corrected all bit errors (not all parity checks OK)
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api.rx_sync_flags_to_text = [ # type: ignore
"----",
"---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 the needs of codec2
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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):
log.debug("[C2 ] Creating audio buffer", size=size)
self.size = size
self.buffer = np.zeros(size, dtype=np.int16)
self.nbuffer = 0
self.mutex = Lock()
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def push(self, samples):
"""
Push new data to buffer
Args:
samples:
Returns:
Nothing
"""
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()
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def pop(self, size):
"""
get data from buffer in size of NIN
Args:
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size:
Returns:
Nothing
"""
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()
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# Resampler ---------------------------------------------------------
# Oversampling rate
api.FDMDV_OS_48 = 6 # type: ignore
# Number of oversampling taps at 48kHz
api.FDMDV_OS_TAPS_48K = 48 # type: ignore
# Number of oversampling filter taps at 8kHz
api.FDMDV_OS_TAPS_48_8K = api.FDMDV_OS_TAPS_48K // api.FDMDV_OS_48 # type: ignore
api.fdmdv_8_to_48_short.argtype = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_int] # type: ignore
api.fdmdv_48_to_8_short.argtype = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_int] # type: ignore
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class resampler:
"""
Re-sampler class
"""
# Re-sample 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):
log.debug("[C2 ] Create 48<->8 kHz resampler")
self.filter_mem8 = np.zeros(self.MEM8, dtype=np.int16)
self.filter_mem48 = np.zeros(self.MEM48)
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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 # type: ignore
# Concatenate 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 = ctypes.byref(np.ctypeslib.as_ctypes(in48_mem), 2 * self.MEM48)
n8 = int(len(in48) / api.FDMDV_OS_48) # type: ignore
out8 = np.zeros(n8, dtype=np.int16)
api.fdmdv_48_to_8_short(out8.ctypes, pin48, n8) # type: ignore
# 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
Re-sample 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
# Concatenate 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 = ctypes.byref(np.ctypeslib.as_ctypes(in8_mem), 2 * self.MEM8)
out48 = np.zeros(api.FDMDV_OS_48 * len(in8), dtype=np.int16) # type: ignore
api.fdmdv_8_to_48_short(out48.ctypes, pin8, len(in8)) # type: ignore
# Store memory for next time
self.filter_mem8 = in8_mem[: self.MEM8]
return out48
def open_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
"""
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# if mode in [FREEDV_MODE.fsk_ldpc_0.value]:
# return ctypes.cast(
# api.freedv_open_advanced(
# FREEDV_MODE.fsk_ldpc.value,
# ctypes.byref(api.FREEDV_MODE_FSK_LDPC_0_ADV),
# ),
# ctypes.c_void_p,
# )
#
# if mode in [FREEDV_MODE.fsk_ldpc_1.value]:
# return ctypes.cast(
# api.freedv_open_advanced(
# FREEDV_MODE.fsk_ldpc.value,
# ctypes.byref(api.FREEDV_MODE_FSK_LDPC_1_ADV),
# ),
# ctypes.c_void_p,
# )
#
return ctypes.cast(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_instance(mode)
# TODO add close session
# get number of bytes per frame for mode
return int(api.freedv_get_bits_per_modem_frame(freedv) / 8)