diff options
| -rw-r--r-- | examples/pitchshift.py | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/examples/pitchshift.py b/examples/pitchshift.py new file mode 100644 index 0000000..df27c7e --- /dev/null +++ b/examples/pitchshift.py @@ -0,0 +1,39 @@ +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) |