Create 32bit float wav file in python?

Question

I want to create 32bit float WAV files in Python (2.x). While \"standard\" WAV files usually use int, many professional audio applications process (and save) audio data as float

Answer 1

Here's my contribution... includes arbitrary word size and arbitrary number of channels. I've taken the liberty of changing float32_wav_file to include a file save for testing. Note that the multichannel data portion of the file structure interleaved. That loop could be be greatly pythonized I'm sure.

# see http://stackoverflow.com/questions/15576798/create-32bit-float-wav-file-in-python
# see... http://blog.theroyweb.com/extracting-wav-file-header-information-using-a-python-script
import struct
def float32_wav_file(file_name, sample_array, sample_rate):
    (M,N)=sample_array.shape
    #print "len sample_array=(%d,%d)" % (M,N)
    byte_count = M * N * 4 # (len(sample_array)) * 4  # 32-bit floats
    wav_file = ""
    # write the header
    wav_file += struct.pack('