mirror of https://github.com/DJ2LS/FreeDATA
410 lines
14 KiB
Python
410 lines
14 KiB
Python
"""
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Python interface to the C-language codec2 library.
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"""
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# -*- coding: utf-8 -*-
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# pylint: disable=invalid-name, line-too-long, c-extension-no-member
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# pylint: disable=import-outside-toplevel, attribute-defined-outside-init
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import ctypes
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import glob
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import os
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import sys
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from enum import Enum
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from threading import Lock
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import numpy as np
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import structlog
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log = structlog.get_logger("codec2")
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# Enum for codec2 modes
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class FREEDV_MODE(Enum):
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"""
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Enumeration for codec2 modes and names
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"""
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sig0 = 14
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sig1 = 14
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datac0 = 14
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datac1 = 10
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datac3 = 12
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fsk_ldpc = 9
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fsk_ldpc_0 = 200
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fsk_ldpc_1 = 201
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# Function for returning the mode value
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def freedv_get_mode_value_by_name(mode: str) -> int:
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"""
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Get the codec2 mode by entering its string
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Args:
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mode: String representation of the codec2 mode.
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Returns:
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int
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"""
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return FREEDV_MODE[mode.lower()].value
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# Function for returning the mode name
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def freedv_get_mode_name_by_value(mode: int) -> str:
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"""
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Get the codec2 mode name as string
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Args:
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mode: Integer value of the codec2 mode.
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Returns:
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string
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"""
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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"):
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# sys.path.append(getattr(sys, "_MEIPASS"))
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#else:
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sys.path.append(os.path.abspath("."))
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log.info("[C2 ] Searching for libcodec2...")
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if sys.platform == "linux":
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files = glob.glob(r"**/*libcodec2*", recursive=True)
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files.append("libcodec2.so")
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elif sys.platform == "darwin":
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if hasattr(sys, "_MEIPASS"):
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files = glob.glob(getattr(sys, "_MEIPASS") + '/**/*libcodec2*', recursive=True)
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else:
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files = glob.glob(r"**/*libcodec2*.dylib", recursive=True)
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elif sys.platform in ["win32", "win64"]:
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files = glob.glob(r"**\*libcodec2*.dll", recursive=True)
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else:
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files = []
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api = None
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for file in files:
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try:
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api = ctypes.CDLL(file)
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log.info("[C2 ] Libcodec2 loaded", path=file)
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break
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except OSError as err:
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log.warning("[C2 ] Libcodec2 found but not loaded", path=file, e=err)
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# Quit module if codec2 cant be loaded
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if api is None or "api" not in locals():
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log.critical("[C2 ] Libcodec2 not loaded - Exiting")
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sys.exit(1)
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# ctypes function init
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# api.freedv_set_tuning_range.restype = ctypes.c_int
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# 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
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api.freedv_open.restype = ctypes.c_void_p
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api.freedv_open_advanced.argtype = [ctypes.c_int, ctypes.c_void_p] # type: ignore
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api.freedv_open_advanced.restype = ctypes.c_void_p
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api.freedv_get_bits_per_modem_frame.argtype = [ctypes.c_void_p] # type: ignore
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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]
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api.freedv_get_modem_extended_stats.restype = ctypes.c_int
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api.freedv_nin.argtype = [ctypes.c_void_p] # type: ignore
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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
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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
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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
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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
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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
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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
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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
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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
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api.freedv_get_modem_stats.restype = ctypes.c_int
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api.freedv_get_n_tx_postamble_modem_samples.argtype = [ctypes.c_void_p] # type: ignore
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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
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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
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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
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api.freedv_get_n_max_modem_samples.restype = ctypes.c_int
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api.FREEDV_FS_8000 = 8000 # type: ignore
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api.FREEDV_MODE_DATAC1 = 10 # type: ignore
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api.FREEDV_MODE_DATAC3 = 12 # type: ignore
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api.FREEDV_MODE_DATAC0 = 14 # type: ignore
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api.FREEDV_MODE_FSK_LDPC = 9 # type: ignore
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# -------------------------------- FSK LDPC MODE SETTINGS
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class ADVANCED(ctypes.Structure):
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"""Advanced structure for fsk modes"""
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_fields_ = [
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("interleave_frames", ctypes.c_int),
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("M", ctypes.c_int),
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("Rs", ctypes.c_int),
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("Fs", ctypes.c_int),
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("first_tone", ctypes.c_int),
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("tone_spacing", ctypes.c_int),
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("codename", ctypes.c_char_p),
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]
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# pylint: disable=pointless-string-statement
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"""
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adv.interleave_frames = 0 # max amplitude
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adv.M = 2 # number of fsk tones 2/4
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adv.Rs = 100 # symbol rate
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adv.Fs = 8000 # sample rate
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adv.first_tone = 1500 # first tone freq
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adv.tone_spacing = 200 # shift between tones
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adv.codename = "H_128_256_5".encode("utf-8") # code word
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HRA_112_112 rate 0.50 (224,112) BPF: 14 not working
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HRA_56_56 rate 0.50 (112,56) BPF: 7 not working
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H_2064_516_sparse rate 0.80 (2580,2064) BPF: 258 working
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HRAb_396_504 rate 0.79 (504,396) BPF: 49 not working
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H_256_768_22 rate 0.33 (768,256) BPF: 32 working
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H_256_512_4 rate 0.50 (512,256) BPF: 32 working
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HRAa_1536_512 rate 0.75 (2048,1536) BPF: 192 not working
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H_128_256_5 rate 0.50 (256,128) BPF: 16 working
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H_4096_8192_3d rate 0.50 (8192,4096) BPF: 512 not working
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H_16200_9720 rate 0.60 (16200,9720) BPF: 1215 not working
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H_1024_2048_4f rate 0.50 (2048,1024) BPF: 128 working
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"""
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# --------------- 2 FSK H_128_256_5, 16 bytes
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api.FREEDV_MODE_FSK_LDPC_0_ADV = ADVANCED() # type: ignore
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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 = 100
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api.FREEDV_MODE_FSK_LDPC_0_ADV.Fs = 8000
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api.FREEDV_MODE_FSK_LDPC_0_ADV.first_tone = 1400 # 1150 4fsk, 1500 2fsk
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api.FREEDV_MODE_FSK_LDPC_0_ADV.tone_spacing = 120 # 200
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api.FREEDV_MODE_FSK_LDPC_0_ADV.codename = "H_128_256_5".encode("utf-8") # code word
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# --------------- 4 H_256_512_4, 7 bytes
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api.FREEDV_MODE_FSK_LDPC_1_ADV = ADVANCED() # type: ignore
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api.FREEDV_MODE_FSK_LDPC_1_ADV.interleave_frames = 0
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api.FREEDV_MODE_FSK_LDPC_1_ADV.M = 4
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api.FREEDV_MODE_FSK_LDPC_1_ADV.Rs = 100
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api.FREEDV_MODE_FSK_LDPC_1_ADV.Fs = 8000
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api.FREEDV_MODE_FSK_LDPC_1_ADV.first_tone = 1250 # 1250 4fsk, 1500 2fsk
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api.FREEDV_MODE_FSK_LDPC_1_ADV.tone_spacing = 200
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api.FREEDV_MODE_FSK_LDPC_1_ADV.codename = "H_256_512_4".encode("utf-8") # code word
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# ------- MODEM STATS STRUCTURES
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MODEM_STATS_NC_MAX = 50 + 1 * 2
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MODEM_STATS_NR_MAX = 160 * 2
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MODEM_STATS_ET_MAX = 8
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MODEM_STATS_EYE_IND_MAX = 160
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MODEM_STATS_NSPEC = 512
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MODEM_STATS_MAX_F_HZ = 4000
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MODEM_STATS_MAX_F_EST = 4
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class MODEMSTATS(ctypes.Structure):
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"""Modem statistics structure"""
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_fields_ = [
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("Nc", ctypes.c_int),
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("snr_est", ctypes.c_float),
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("rx_symbols", (ctypes.c_float * MODEM_STATS_NR_MAX) * MODEM_STATS_NC_MAX),
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("nr", ctypes.c_int),
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("sync", ctypes.c_int),
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("foff", ctypes.c_float),
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("rx_timing", ctypes.c_float),
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("clock_offset", ctypes.c_float),
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("sync_metric", ctypes.c_float),
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("pre", ctypes.c_int),
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("post", ctypes.c_int),
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("uw_fails", ctypes.c_int),
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("rx_eye", (ctypes.c_float * MODEM_STATS_ET_MAX) * MODEM_STATS_EYE_IND_MAX),
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("neyetr", ctypes.c_int), # How many eye traces are plotted
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("neyesamp", ctypes.c_int), # How many samples in the eye diagram
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("f_est", (ctypes.c_float * MODEM_STATS_MAX_F_EST)),
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("fft_buf", (ctypes.c_float * MODEM_STATS_NSPEC * 2)),
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("fft_cfg", ctypes.c_void_p)
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]
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# Return code flags for freedv_get_rx_status() function
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api.FREEDV_RX_TRIAL_SYNC = 0x1 # type: ignore # demodulator has trial sync
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api.FREEDV_RX_SYNC = 0x2 # type: ignore # demodulator has sync
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api.FREEDV_RX_BITS = 0x4 # type: ignore # data bits have been returned
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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
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"----",
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"---T",
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"--S-",
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"--ST",
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"-B--",
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"-B-T",
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"-BS-",
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"-BST",
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"E---",
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"E--T",
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"E-S-",
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"E-ST",
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"EB--",
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"EB-T",
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"EBS-",
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"EBST",
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]
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# Audio buffer ---------------------------------------------------------
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class audio_buffer:
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"""
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Thread-safe audio buffer, which fits the needs of codec2
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made by David Rowe, VK5DGR
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"""
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# A buffer of int16 samples, using a fixed length numpy array self.buffer for storage
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# self.nbuffer is the current number of samples in the buffer
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def __init__(self, size):
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log.debug("[C2 ] Creating audio buffer", size=size)
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self.size = size
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self.buffer = np.zeros(size, dtype=np.int16)
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self.nbuffer = 0
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self.mutex = Lock()
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def push(self, samples):
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"""
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Push new data to buffer
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Args:
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samples:
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Returns:
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Nothing
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"""
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self.mutex.acquire()
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# Add samples at the end of the buffer
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assert self.nbuffer + len(samples) <= self.size
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self.buffer[self.nbuffer : self.nbuffer + len(samples)] = samples
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self.nbuffer += len(samples)
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self.mutex.release()
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def pop(self, size):
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"""
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get data from buffer in size of NIN
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Args:
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size:
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Returns:
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Nothing
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"""
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self.mutex.acquire()
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# Remove samples from the start of the buffer
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self.nbuffer -= size
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self.buffer[: self.nbuffer] = self.buffer[size : size + self.nbuffer]
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assert self.nbuffer >= 0
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self.mutex.release()
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# Resampler ---------------------------------------------------------
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# Oversampling rate
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api.FDMDV_OS_48 = 6 # type: ignore
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# Number of oversampling taps at 48kHz
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api.FDMDV_OS_TAPS_48K = 48 # type: ignore
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# Number of oversampling filter taps at 8kHz
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api.FDMDV_OS_TAPS_48_8K = api.FDMDV_OS_TAPS_48K // api.FDMDV_OS_48 # type: ignore
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api.fdmdv_8_to_48_short.argtype = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_int] # type: ignore
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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:
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"""
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Re-sampler class
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"""
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# 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
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MEM48 = api.FDMDV_OS_TAPS_48K
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def __init__(self):
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log.debug("[C2 ] Create 48<->8 kHz resampler")
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self.filter_mem8 = np.zeros(self.MEM8, dtype=np.int16)
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self.filter_mem48 = np.zeros(self.MEM48)
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def resample48_to_8(self, in48):
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"""
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Audio resampler integration from codec2
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Downsample audio from 48000Hz to 8000Hz
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Args:
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in48: input data as np.int16
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Returns:
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Downsampled 8000Hz data as np.int16
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"""
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assert in48.dtype == np.int16
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# Length of input vector must be an integer multiple of api.FDMDV_OS_48
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assert len(in48) % api.FDMDV_OS_48 == 0 # type: ignore
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# Concatenate filter memory and input samples
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in48_mem = np.zeros(self.MEM48 + len(in48), dtype=np.int16)
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in48_mem[: self.MEM48] = self.filter_mem48
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in48_mem[self.MEM48 :] = in48
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# In C: pin48=&in48_mem[MEM48]
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pin48 = ctypes.byref(np.ctypeslib.as_ctypes(in48_mem), 2 * self.MEM48)
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n8 = int(len(in48) / api.FDMDV_OS_48) # type: ignore
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out8 = np.zeros(n8, dtype=np.int16)
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api.fdmdv_48_to_8_short(out8.ctypes, pin48, n8) # type: ignore
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# Store memory for next time
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self.filter_mem48 = in48_mem[: self.MEM48]
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return out8
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def resample8_to_48(self, in8):
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"""
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Audio resampler integration from codec2
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Re-sample audio from 8000Hz to 48000Hz
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Args:
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in8: input data as np.int16
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Returns:
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48000Hz audio as np.int16
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"""
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assert in8.dtype == np.int16
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# Concatenate filter memory and input samples
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in8_mem = np.zeros(self.MEM8 + len(in8), dtype=np.int16)
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in8_mem[: self.MEM8] = self.filter_mem8
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in8_mem[self.MEM8 :] = in8
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# In C: pin8=&in8_mem[MEM8]
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pin8 = ctypes.byref(np.ctypeslib.as_ctypes(in8_mem), 2 * self.MEM8)
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out48 = np.zeros(api.FDMDV_OS_48 * len(in8), dtype=np.int16) # type: ignore
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api.fdmdv_8_to_48_short(out48.ctypes, pin8, len(in8)) # type: ignore
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# Store memory for next time
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self.filter_mem8 = in8_mem[: self.MEM8]
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return out48
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