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64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
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#!/usr/bin/python
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# based on : www.daniweb.com/code/snippet263775.html
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# from https://stackoverflow.com/questions/33879523/python-how-can-i-generate-a-wav-file-with-beeps
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import math
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import wave
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import struct
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# Audio will contain a long list of samples (i.e. floating point numbers describing the
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# waveform). If you were working with a very long sound you'd want to stream this to
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# disk instead of buffering it all in memory list this. But most sounds will fit in
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# memory.
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audio = []
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sample_rate = 44100.0
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def append_silence(duration_milliseconds=500):
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num_samples = duration_milliseconds * (sample_rate / 1000.0)
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for x in range(int(num_samples)):
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audio.append(0.0)
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return
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def append_sinewave(
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freq=440.0,
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duration_milliseconds=500,
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volume=1.0):
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global audio # using global variables isn't cool.
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num_samples = duration_milliseconds * (sample_rate / 1000.0)
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for x in range(int(num_samples)):
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audio.append(volume * math.sin(2 * math.pi * freq * ( x / sample_rate )))
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def append_squarewave(
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freq=440.0,
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duration_milliseconds=500,
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volume=1.0):
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global audio
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num_samples = duration_milliseconds * (sample_rate / 1000.0)
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samples_per_toggle = math.floor(sample_rate / freq)
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for x in range(int(num_samples)):
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on = math.floor(x / samples_per_toggle) % 2
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audio.append(volume * on)
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def save_wav(file_name):
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wav_file=wave.open(file_name,"w")
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nchannels = 1
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sampwidth = 2
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nframes = len(audio)
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comptype = "NONE"
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compname = "not compressed"
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wav_file.setparams((nchannels, sampwidth, sample_rate, nframes, comptype, compname))
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for sample in audio:
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wav_file.writeframes(struct.pack('h', int( sample * 32767.0 )))
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wav_file.close()
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return
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#for _ in range(8):
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# append_sinewave(volume=1.0, freq=1000.0)
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# append_silence()
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append_sinewave(freq=500, duration_milliseconds=500)
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append_sinewave(freq=1000, duration_milliseconds=500)
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append_sinewave(freq=2000, duration_milliseconds=500)
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append_sinewave(freq=500, duration_milliseconds=500)
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save_wav("output.wav")
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