Carlo DiCelico wrote:
I saw an article on O'Reilly about using NumPy and Dislin to analyze and visualize WAV files. It's a really fantastic article but was a little out of date. I updated the script to work with the newer modules &etc but am still having trouble getting it working.The line temp[i,:] = array(struct.unpack("%dB"%(fft_length), tempb),Float) - 128.0 always returns the same error: "Traceback (most recent call last): File "pysono.py", line 31, in <module> temp[i,:] = array(struct.unpack("%dB"%(fft_length),tempb),float) - 128.0 struct.error: unpack requires a string argument of length 256" when I do python pysono.py test.wav 256 I'm sure it's probably something simple but I just can't see what it is! Here's the original code: http://onlamp.com/python/2001/01/31/graphics/pysono.py
.readframes(n) returns (at most) n _frames_ as a bytestring (str), not n bytes. I tried reading 256 frames from a .wav file containing stereo at 16 bits per channel and got 1024 bytes (4 bytes per frame, not surprisingly!). -- http://mail.python.org/mailman/listinfo/python-list
