On 09/20/2010 10:37 AM, j wade wrote:
> I am attempting to create a .wav file from an array in sage using the
> package wavfile. I am importing a .wav file using the package
> wavfile, and then using the python wavelets package 'pywt' to create
> the array. Here are the commands:
>
> import pywt, scipy, numpy
> from scipy.io import wavfile
> x=wavfile.read('/directory/file.wav')
> (cA, cD)=pywt.dwt(x[1],'db1')
> xnew=pywt.idwt(cA,cD,'db1')
> wavfile.write("noisyholanew.wav",44100, xnew)
>
> The last command generates the following error message:
> ------------------------------------------------------------------
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "_sage_input_23.py", line 10, in <module>
> exec compile(u'open("___code___.py","w").write("# -*- coding:
> utf-8 -*-\\n" +
> _support_.preparse_worksheet_cell(base64.b64decode("d2F2ZmlsZS53cml0ZSgibm9pc3lob2xhbmV3LndhdiIsNDQxMDAsIHhuZXcp"),globals())
> +"\\n"); execfile(os.path.abspath("___code___.py"))
> File "", line 1, in <module>
>
> File "/tmp/tmpJPm6LZ/___code___.py", line 3, in <module>
> exec
> compile(u'wavfile.write("noisyholanew.wav",_sage_const_44100 , xnew)
> File "", line 1, in <module>
>
> File "/home/jeremy/Programs/sage-4.5.3/local/lib/python2.6/site-
> packages/scipy/io/wavfile.py", line 99, in write
> fid.write(struct.pack('ihHIIHH', 16, 1, noc, rate, sbytes, ba,
> bits))
> SystemError: Objects/longobject.c:336: bad argument to internal
> function
>
> noisyholanew.wav
> -------------------------------------------------------------------
>
> xnew is the array. type(xnew) returns <type 'numpy.ndarray'>.
>
> When I run this series of commands in a python shell, I receive no
> error, and a .wav file is generated.
>
> I would like to be able to run this series of commands in sage as
> well.
>
> I am using Sage 4.5.3 (compiled from source) and Python 2.6.4 on
> Ubuntu 9.10.
I followed Minh's instructions
http://groups.google.com/group/sage-support/browse_thread/thread/6c2b30e1690b9d7e/b18651943453a4b5#b18651943453a4b5
to install PyWavelets in Sage 4.6.alpha1 and get ultimately the same
SystemError with the Sage command-line interpreter:
sage: import pywt, scipy, numpy
sage: from scipy.io import wavfile
sage: x=wavfile.read('moo.wav')
Reading fmt chunk
Reading data chunk
sage: (cA, cD)=pywt.dwt(x[1],'db1')
sage: xnew=pywt.idwt(cA,cD,'db1')
sage: wavfile.write("noisyholanew.wav",44100, xnew)
/mnt/usb1/scratch/mpatel/tmp/sage-4.6.alpha1-pywt/local/bin/sage-ipython:1:
DeprecationWarning: struct integer overflow masking is deprecated
#!/usr/bin/env python
---------------------------------------------------------------------------
SystemError Traceback (most recent call last)
/mnt/usb1/scratch/mpatel/tmp/sage-4.6.alpha1-pywt/<ipython console> in
<module>()
/mnt/usb1/scratch/mpatel/tmp/sage-4.6.alpha1-pywt/local/lib/python2.6/site-packages/scipy/io/wavfile.pyc
in write(filename, rate, data)
97 sbytes = rate*(bits / 8)*noc
98 ba = noc * (bits / 8)
---> 99 fid.write(struct.pack('ihHIIHH', 16, 1, noc, rate, sbytes,
ba, bits))
100 # data chunk
101 fid.write('data')
SystemError: Objects/longobject.c:336: bad argument to internal function
sage:
But I get no visible errors with './sage -python' or './sage -ipython'.
I don't know if the problem is in the Sage library, Python, NumPy,
and/or PyWavelets. Maybe one of
http://projects.scipy.org/numpy/ticket/1110
http://www.mail-archive.com/[email protected]/msg00362.html
http://lists.tiker.net/pipermail/pycuda/2009-November/001951.html
will help?
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