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#1700821: add a note to audioop docs about signedness of sample formats.

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Georg Brandl 2008-03-24 09:34:34 +00:00
parent b72233ce63
commit 9bdead0aed
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Doc/library/audioop.rst
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@ -141,6 +141,18 @@ The module defines the following variables and functions:
Convert samples between 1-, 2- and 4-byte formats. Convert samples between 1-, 2- and 4-byte formats.
.. note::
In some audio formats, such as .WAV files, 16 and 32 bit samples are
signed, but 8 bit samples are unsigned. So when converting to 8 bit wide
samples for these formats, you need to also add 128 to the result::
new_frames = audioop.lin2lin(frames, old_width, 1)
new_frames = audioop.bias(new_frames, 1, 128)
The same, in reverse, has to be applied when converting from 8 to 16 or 32
bit width samples.
.. function:: lin2ulaw(fragment, width) .. function:: lin2ulaw(fragment, width)