50 lines
1.4 KiB
Python
Executable File
50 lines
1.4 KiB
Python
Executable File
#!/usr/bin/env python3
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'''
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Demo receive program for FreeDV API 700D mode.
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cd ~/codec2/build_linux
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cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | ../demo/freedv_700d_rx.py | aplay -f S16_LE
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Credits: Thanks DJ2LS, xssfox, VK5QI
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'''
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import ctypes
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from ctypes import *
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import sys
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import pathlib
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import platform
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if platform.system() == 'Darwin':
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libname = pathlib.Path().absolute() / "src/libcodec2.dylib"
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else:
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libname = pathlib.Path().absolute() / "src/libcodec2.so"
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# See: https://docs.python.org/3/library/ctypes.html
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c_lib = ctypes.CDLL(libname)
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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_n_max_speech_samples.argtype = [c_void_p]
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c_lib.freedv_get_n_max_speech_samples.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_rx.argtype = [c_void_p, c_char_p, c_char_p]
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c_lib.freedv_rx.restype = c_int
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FREEDV_MODE_700D = 7 # from freedv_api.h
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freedv = cast(c_lib.freedv_open(FREEDV_MODE_700D), c_void_p)
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n_max_speech_samples = c_lib.freedv_get_n_max_speech_samples(freedv)
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speech_out = create_string_buffer(2*n_max_speech_samples)
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while True:
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nin = c_lib.freedv_nin(freedv)
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demod_in = sys.stdin.buffer.read(nin*2)
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if len(demod_in) == 0: quit()
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nout = c_lib.freedv_rx(freedv, speech_out, demod_in)
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sys.stdout.buffer.write(speech_out[:nout*2])
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