CSV to WAV: Needed a way to convert a list of numbers in a CSV file to a wave audio file. Go python.

generate.py

#!/usr/bin/python

import wave
import numpy
import struct
import sys
import csv
from scikits.samplerate import resample

def write_wav(data, filename, framerate, amplitude):
    wavfile = wave.open(filename, "w")
    nchannels = 1
    sampwidth = 2
    framerate = framerate
    nframes = len(data)
    comptype = "NONE"
    compname = "not compressed"
    wavfile.setparams((nchannels,
                        sampwidth,
                        framerate,
                        nframes,
                        comptype,
                        compname))
    print("Please be patient whilst the file is written")
    frames = []
    for s in data:
        mul = int(s * amplitude)
        # print "s: %f mul: %d" % (s, mul)
        frames.append(struct.pack('h', mul))
    # frames = (struct.pack('h', int(s*self.amp)) for s in sine_list)
    frames = ''.join(frames)
    for x in xrange(0, 7200):
        wavfile.writeframes(frames)
    wavfile.close()
    print("%s written" %(filename))
    
    
if __name__ == "__main__":
    if len(sys.argv) <= 1:
        print "You must supply a filename to generate"
        exit(-1)
    for fname in sys.argv[1:]:
        data = []
        for time, value in csv.reader(open(fname, 'U'), delimiter=','):
            try:
                data.append(float(value))
            except ValueError:
                pass # Just skip it
        print "Generating wave file from %d samples" % (len(data),)
        arr = numpy.array(data)
        # Normalize data
        arr /= numpy.max(numpy.abs(data))
        filename_head, extension = fname.rsplit(".", 1)
        # Resample normalized data to 44.1 kHz
        target_samplerate = 44100
        sampled = resample(arr, target_samplerate/100000.0, 'sinc_best')
        write_wav(sampled, filename_head + ".wav", 100000, 32700)

Thanks for this perfect little nugget of code. Saved me a ton of time!

Great Job

Thanks

Hi,

i always receive this error from line 44:

ValueError: Too many values to unpack (expected 2)

How to fix it?

Thanks in advance.

Best,

V.

how to convert .wav file into .csv file?

Hii Plaese tell me how to convert wav file into .csv file
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