mirror of https://github.com/drowe67/phasenn.git
80 lines
2.2 KiB
Python
Executable File
80 lines
2.2 KiB
Python
Executable File
#!/usr/bin/python3
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# codec2_model.py
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# David Rowe Dec 2019
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#
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# Python Codec 2 model records I/O
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import sys
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import construct
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import numpy as np
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import matplotlib.pyplot as plt
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max_amp = 160
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Fs = 8000
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width = 256
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codec2_model = construct.Struct(
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"Wo" / construct.Float32l,
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"L" / construct.Int32sl,
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"A" / construct.Array(max_amp+1, construct.Float32l),
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"phi" / construct.Array(max_amp+1, construct.Float32l),
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"voiced" / construct.Int32sl
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)
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def read(filename, max_nb_samples=1E32):
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# Determine number of records in file, not very Pythonic I know :-)
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nb_samples = 0
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with open(filename, 'rb') as f:
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while True and (nb_samples < max_nb_samples):
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try:
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model = codec2_model.parse_stream(f)
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nb_samples += 1
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except:
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f.close()
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break
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Wo = np.zeros(nb_samples)
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L = np.zeros(nb_samples, dtype=int)
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A = np.zeros((nb_samples, width))
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phi = np.zeros((nb_samples, width))
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voiced = np.zeros(nb_samples, dtype=int)
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# Read Codec 2 model records into numpy arrays for further work
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with open(filename, 'rb') as f:
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for i in range(nb_samples):
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model = codec2_model.parse_stream(f)
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Wo[i] = model.Wo
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L[i] = model.L
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A[i,1:L[i]+1] = model.A[1:L[i]+1]
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phi[i,1:L[i]+1] = model.phi[1:L[i]+1]
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voiced[i] = model.voiced
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f.close()
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return Wo, L, A, phi, voiced
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def write(Wo, L, A, phi, voiced, filename):
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nb_samples = Wo.size
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with open(filename, 'wb') as f:
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for i in range(nb_samples):
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model = codec2_model.build(dict(Wo=Wo[i], L=L[i], A=A[i,:max_amp+1], phi=phi[i,:max_amp+1], voiced=voiced[i]))
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f.write(model)
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if __name__ == "__main__":
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# do this first:
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# /codec2/build_linux$ ./src/c2sim ../raw/hts1a.raw --modelout hts1a.model
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Wo, L, A, phi, voiced = read("/home/david/codec2/build_linux/hts1a.model")
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write(Wo, L, A, phi, voiced, "/home/david/codec2/build_linux/hts1a_out.model")
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plt.figure(1)
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plt.plot(Wo*4000/np.pi)
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plt.show(block=False)
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plt.figure(2)
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plt.plot(A[30,:])
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plt.show()
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