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import sys
import math
import numpy as np
import scipy.io.wavfile as wav
import simpl
usage = 'Usage: python {0} '.format(__file__) + \
'<input wav file> <pitch shift amount> <output wav file>'
if len(sys.argv) != 4:
print usage
sys.exit(1)
audio, sampling_rate = simpl.read_wav(sys.argv[1])
pitch_shift_amount = float(sys.argv[2])
output_file = sys.argv[3]
pd = simpl.LorisPeakDetection()
frames = pd.find_peaks(audio)
pt = simpl.SMSPartialTracking()
frames = pt.find_partials(frames)
twelfth_root_2 = math.pow(2.0, 1.0 / 12)
freq_scale = math.pow(twelfth_root_2, pitch_shift_amount)
for frame in frames:
partials = frame.partials
for p in partials:
p.frequency *= freq_scale
frame.partials = partials
synth = simpl.SndObjSynthesis()
harm_synth = synth.synth(frames)
r = simpl.SMSResidual()
res_synth = r.synth(audio)
audio_out = harm_synth + res_synth
audio_out = np.asarray(audio_out * 32768, np.int16)
wav.write(output_file, sampling_rate, audio_out)
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