67 lines
1.7 KiB
Python
67 lines
1.7 KiB
Python
import os
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import sys
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import soundfile as sf
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import samplerate
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# Adapted from https://github.com/rgrosset/pico-pwm-audio
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print("loading file...")
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soundfile = 'audio/output.wav'
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data_in, datasamplerate = sf.read(soundfile)
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# This means stereo so extract one channel 0
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if len(data_in.shape)>1:
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data_in = data_in[:,0]
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print("resampling...")
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converter = 'sinc_best' # or 'sinc_fastest', ...
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desired_sample_rate = 22000.0
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ratio = desired_sample_rate/datasamplerate
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data_out = samplerate.resample(data_in, ratio, converter)
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print("analyzing...")
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maxValue = max(data_out)
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minValue = min(data_out)
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print("length", len(data_out))
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print("max value", max(data_out))
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print("min value", min(data_out))
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vrange = (maxValue - minValue)
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print("value range", vrange)
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print("normalizing...")
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# normalize to 0-1
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normalized = [int((v-minValue)/vrange*255) for v in data_out]
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# print("generating header...")
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# m68code = "/* File "+soundfile+ "\r\n * Sample rate "+str(int(desired_sample_rate)) +" Hz\r\n */\r\n"
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# m68code += "#define WAV_DATA_LENGTH "+str(len(data_out))+" \r\n\r\n"
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# m68code += "static const uint8_t WAV_DATA[] = {\r\n "
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# m68code += ','.join(str(v) for v in normalized)
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# # keep track of first and last values to avoid
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# # blip when the loop restarts.. make the end value
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# # the average of the first and last.
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# end_value = int( (normalized[0] + normalized[len(normalized) - 1]) / 2)
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# m68code+=","+str(end_value)+'\n};\n'
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# print("writing output...")
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# with open("src/audio_sample.h", "w") as f:
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# f.write(m68code)
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# print("done!")
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print("writing blob...")
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os.makedirs("video_output", exist_ok=True)
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with open("video_output/audio.bin", "wb") as f:
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f.write(bytes(normalized))
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print("done!")
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