86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
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import wave, ctypes
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### Convert fb speex format to wav ###
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######################################
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"""
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This piece of code is just copied & pasted from https://git.savannah.nongnu.org/cgit/fbvbconv-py.git/tree/fbvbconv.py
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which has kindly managed to convert the messages of the answering machine of fritzboxes from a specially configured Speex format to a wave file. All appreciation to the author(s).
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"""
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speexlib = ctypes.cdll.LoadLibrary("libspeex.so.1")
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SPEEX_SET_SAMPLING_RATE = 24
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SPEEX_GET_FRAME_SIZE = 3
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class SpeexMode(ctypes.c_void_p):
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pass
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class Speex(ctypes.c_void_p):
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pass
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class SpeexBits(ctypes.Structure):
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_fields_ = [
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('chars', ctypes.c_char_p),
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('nbBits', ctypes.c_int),
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('charPtr', ctypes.c_int),
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('bitPtr', ctypes.c_int),
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('owner', ctypes.c_int),
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('overflow', ctypes.c_int),
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('but_size', ctypes.c_int),
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('reserved1', ctypes.c_int),
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('reserved2', ctypes.c_void_p)
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]
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speex_lib_get_mode = speexlib.speex_lib_get_mode
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speex_lib_get_mode.restype = SpeexMode
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speex_decoder_init = speexlib.speex_decoder_init
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speex_decoder_init.restype = Speex
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speex_decoder_ctl = speexlib.speex_decoder_ctl
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speex_bits_init = speexlib.speex_bits_init
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speex_bits_read_from = speexlib.speex_bits_read_from
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speex_decode_int = speexlib.speex_decode_int
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speex_bits_remaining = speexlib.speex_bits_remaining
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speex_bits_destroy = speexlib.speex_bits_destroy
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def speex_convert(inp, outp):
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# rec = open(inp, 'rb').read()
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rec = inp.read()
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wav = wave.open(outp, 'wb')
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wav.setnchannels(1)
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wav.setsampwidth(2)
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wav.setframerate(8000)
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mode = speex_lib_get_mode(0)
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speex = speex_decoder_init(mode)
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speex_decoder_ctl(speex, SPEEX_SET_SAMPLING_RATE, ctypes.byref(ctypes.c_int(8000)))
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bits = SpeexBits()
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speex_bits_init(ctypes.byref(bits))
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frame_size = ctypes.c_int()
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speex_decoder_ctl(speex, SPEEX_GET_FRAME_SIZE, ctypes.byref(frame_size))
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output = ctypes.create_string_buffer(2000)
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offs = 0
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while offs < len(rec):
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nbytes = rec[offs]
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offs += 1
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if nbytes != 0x26:
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continue
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buf = ctypes.create_string_buffer(rec[offs:offs + nbytes])
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offs += nbytes
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speex_bits_read_from(ctypes.byref(bits), buf, ctypes.c_int(nbytes))
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# this loop looks strange, but its like in roger router and seems to work
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for i in range(2):
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rc = speex_decode_int(speex, ctypes.byref(bits), output)
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if rc == -1:
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break
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elif rc == -2:
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print("Decoding error: corrupted stream?");
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break
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if speex_bits_remaining(ctypes.byref(bits)) < 0:
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print("Decoding overflow: corrupted stream?");
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break
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wav.writeframes(output[0:2 * frame_size.value])
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wav.close()
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speex_bits_destroy(ctypes.byref(bits))
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