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https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
outsourced ctypes header
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dj2ls
parent
f70be11d95
commit
d5d6a80b34
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@ -51,33 +51,9 @@ if AUDIO_INPUT_DEVICE != 0:
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input_device_index=AUDIO_INPUT_DEVICE,
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)
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# LOAD FREEDV
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libname = "libcodec2.so"
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c_lib = ctypes.CDLL(libname)
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# ctypes function init
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c_lib.freedv_open.argype = [c_int]
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c_lib.freedv_open.restype = c_void_p
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c_lib.freedv_get_bits_per_modem_frame.argtype = [c_void_p]
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c_lib.freedv_get_bits_per_modem_frame.restype = c_int
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c_lib.freedv_nin.argtype = [c_void_p]
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c_lib.freedv_nin.restype = c_int
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c_lib.freedv_rawdatarx.argtype = [c_void_p, c_char_p, c_char_p]
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c_lib.freedv_rawdatarx.restype = c_int
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c_lib.freedv_get_n_max_modem_samples.argtype = [c_void_p]
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c_lib.freedv_get_n_max_modem_samples.restype = c_int
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c_lib.freedv_set_frames_per_burst.argtype = [c_void_p, c_int]
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c_lib.freedv_set_frames_per_burst.restype = c_void_p
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c_lib.freedv_get_rx_status.argtype = [c_void_p]
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c_lib.freedv_get_rx_status.restype = c_int
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sys.path.insert(0,'..')
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import codec2
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# ----------------------------------------------------------------
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@ -85,18 +61,17 @@ c_lib.freedv_get_rx_status.restype = c_int
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# DATA CHANNEL INITIALISATION
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# open codec2 instance
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freedv = cast(c_lib.freedv_open(MODE), c_void_p)
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freedv = cast(codec2.api.freedv_open(MODE), c_void_p)
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# get number of bytes per frame for mode
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bytes_per_frame = int(c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
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bytes_per_frame = int(codec2.api.freedv_get_bits_per_modem_frame(freedv)/8)
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payload_bytes_per_frame = bytes_per_frame -2
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n_max_modem_samples = c_lib.freedv_get_n_max_modem_samples(freedv)
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n_max_modem_samples = codec2.api.freedv_get_n_max_modem_samples(freedv)
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bytes_out = create_string_buffer(bytes_per_frame * 2)
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c_lib.freedv_set_frames_per_burst(freedv,N_FRAMES_PER_BURST)
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codec2.api.freedv_set_frames_per_burst(freedv,N_FRAMES_PER_BURST)
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total_n_bytes = 0
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rx_total_frames = 0
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rx_frames = 0
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@ -109,7 +84,7 @@ while receive and time.time() < timeout:
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data_in = b''
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if AUDIO_INPUT_DEVICE != 0:
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nin = c_lib.freedv_nin(freedv)
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nin = codec2.api.freedv_nin(freedv)
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nin_converted = int(nin*(AUDIO_SAMPLE_RATE_RX/MODEM_SAMPLE_RATE))
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if DEBUGGING_MODE == True:
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print(f"NIN: {nin} [{nin_converted}]", file=sys.stderr)
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@ -119,14 +94,14 @@ while receive and time.time() < timeout:
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data_in = data_in[0].rstrip(b'\x00')
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else:
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nin = c_lib.freedv_nin(freedv) * 2
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nin = codec2.api.freedv_nin(freedv) * 2
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data_in = sys.stdin.buffer.read(nin)
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nbytes = c_lib.freedv_rawdatarx(freedv, bytes_out, data_in) # demodulate audio
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nbytes = codec2.api.freedv_rawdatarx(freedv, bytes_out, data_in) # demodulate audio
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total_n_bytes = total_n_bytes + nbytes
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if DEBUGGING_MODE == True:
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print(f"SYNC: {c_lib.freedv_get_rx_status(freedv)}", file=sys.stderr)
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print(f"SYNC: {codec2.api.freedv_get_rx_status(freedv)}", file=sys.stderr)
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if nbytes == bytes_per_frame:
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rx_total_frames = rx_total_frames + 1
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@ -50,55 +50,31 @@ if AUDIO_OUTPUT_DEVICE != 0:
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# data binary string
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data_out = b'HELLO WORLD!'
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# LOAD FREEDV
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libname = "libcodec2.so"
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c_lib = ctypes.CDLL(libname)
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# ctypes function init
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c_lib.freedv_open.argype = [c_int]
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c_lib.freedv_open.restype = c_void_p
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c_lib.freedv_get_bits_per_modem_frame.argtype = [c_void_p]
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c_lib.freedv_get_bits_per_modem_frame.restype = c_int
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c_lib.freedv_get_n_tx_preamble_modem_samples.argtype = [c_void_p]
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c_lib.freedv_get_n_tx_preamble_modem_samples.restype = c_int
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c_lib.freedv_get_n_tx_postamble_modem_samples.argtype = [c_void_p]
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c_lib.freedv_get_n_tx_postamble_modem_samples.restype = c_int
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c_lib.freedv_gen_crc16.argtype = [c_void_p, c_int]
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c_lib.freedv_gen_crc16.restype = c_void_p
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c_lib.freedv_nin.argtype = [c_void_p]
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c_lib.freedv_nin.restype = c_int
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c_lib.freedv_rawdatatx.argtype = [c_void_p, c_char_p, c_char_p]
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c_lib.freedv_rawdatatx.restype = c_int
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sys.path.insert(0,'..')
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import codec2
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# ----------------------------------------------------------------
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# open codec2 instance
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freedv = cast(c_lib.freedv_open(MODE), c_void_p)
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freedv = cast(codec2.api.freedv_open(MODE), c_void_p)
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# get number of bytes per frame for mode
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bytes_per_frame = int(c_lib.freedv_get_bits_per_modem_frame(freedv)/8)
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bytes_per_frame = int(codec2.api.freedv_get_bits_per_modem_frame(freedv)/8)
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payload_bytes_per_frame = bytes_per_frame -2
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# init buffer for data
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n_tx_modem_samples = c_lib.freedv_get_n_tx_modem_samples(freedv)
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n_tx_modem_samples = codec2.api.freedv_get_n_tx_modem_samples(freedv)
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mod_out = create_string_buffer(n_tx_modem_samples * 2)
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# init buffer for preample
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n_tx_preamble_modem_samples = c_lib.freedv_get_n_tx_preamble_modem_samples(freedv)
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n_tx_preamble_modem_samples = codec2.api.freedv_get_n_tx_preamble_modem_samples(freedv)
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mod_out_preamble = create_string_buffer(n_tx_preamble_modem_samples * 2)
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# init buffer for postamble
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n_tx_postamble_modem_samples = c_lib.freedv_get_n_tx_postamble_modem_samples(freedv)
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n_tx_postamble_modem_samples = codec2.api.freedv_get_n_tx_postamble_modem_samples(freedv)
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mod_out_postamble = create_string_buffer(n_tx_postamble_modem_samples * 2)
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@ -108,7 +84,7 @@ buffer[:len(data_out)] = data_out # set buffersize to length of data which will
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# create crc for data frame - we are using the crc function shipped with codec2 to avoid
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# crc algorithm incompatibilities
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crc = ctypes.c_ushort(c_lib.freedv_gen_crc16(bytes(buffer), payload_bytes_per_frame)) # generate CRC16
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crc = ctypes.c_ushort(codec2.api.freedv_gen_crc16(bytes(buffer), payload_bytes_per_frame)) # generate CRC16
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crc = crc.value.to_bytes(2, byteorder='big') # convert crc to 2 byte hex string
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buffer += crc # append crc16 to buffer
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@ -118,21 +94,21 @@ print(f"TOTAL BURSTS: {N_BURSTS} TOTAL FRAMES_PER_BURST: {N_FRAMES_PER_BURST}",
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for i in range(1,N_BURSTS+1):
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# write preamble to txbuffer
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c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble)
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codec2.api.freedv_rawdatapreambletx(freedv, mod_out_preamble)
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txbuffer = bytes(mod_out_preamble)
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# create modulaton for N = FRAMESPERBURST and append it to txbuffer
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for n in range(1,N_FRAMES_PER_BURST+1):
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data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
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c_lib.freedv_rawdatatx(freedv,mod_out,data) # modulate DATA and save it into mod_out pointer
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codec2.api.freedv_rawdatatx(freedv,mod_out,data) # modulate DATA and save it into mod_out pointer
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txbuffer += bytes(mod_out)
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print(f"BURST: {i}/{N_BURSTS} FRAME: {n}/{N_FRAMES_PER_BURST}", file=sys.stderr)
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# append postamble to txbuffer
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c_lib.freedv_rawdatapostambletx(freedv, mod_out_postamble)
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codec2.api.freedv_rawdatapostambletx(freedv, mod_out_postamble)
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txbuffer += bytes(mod_out_postamble)
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# append a delay between bursts as audio silence
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37
test/codec2.py
Normal file
37
test/codec2.py
Normal file
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@ -0,0 +1,37 @@
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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import ctypes
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from ctypes import *
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import sys
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print("loading module", file=sys.stderr)
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# LOAD FREEDV
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libname = "libcodec2.so"
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api = ctypes.CDLL(libname)
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# ctypes function init
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api.freedv_open.argype = [c_int]
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api.freedv_open.restype = c_void_p
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api.freedv_get_bits_per_modem_frame.argtype = [c_void_p]
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api.freedv_get_bits_per_modem_frame.restype = c_int
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api.freedv_nin.argtype = [c_void_p]
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api.freedv_nin.restype = c_int
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api.freedv_rawdatarx.argtype = [c_void_p, c_char_p, c_char_p]
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api.freedv_rawdatarx.restype = c_int
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api.freedv_get_n_max_modem_samples.argtype = [c_void_p]
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api.freedv_get_n_max_modem_samples.restype = c_int
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api.freedv_set_frames_per_burst.argtype = [c_void_p, c_int]
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api.freedv_set_frames_per_burst.restype = c_void_p
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api.freedv_get_rx_status.argtype = [c_void_p]
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api.freedv_get_rx_status.restype = c_int
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