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Diffstat (limited to 'Doc/library/audioop.rst')
| -rw-r--r-- | Doc/library/audioop.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Doc/library/audioop.rst b/Doc/library/audioop.rst index 8ee2795..9eb315f 100644 --- a/Doc/library/audioop.rst +++ b/Doc/library/audioop.rst @@ -136,6 +136,18 @@ The module defines the following variables and functions: 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) |