24 bit signed integer binary conversion help needed

[Grant Edwards]

On 2010-01-08, Grant Edwards <invalid at invalid.invalid> wrote:
> On 2010-01-08, Robert Somerville <rsomerville at sjgeophysics.com> wrote:
>
>> I am trying to read 24bit signed WAV format (little endian) data from a 
>> WAV file and convert it to 32 bit little endian integer format ... can 
>> anybody please tell me how to do the conversion from 24 bit to 32 bit 
>> with a snippet of Python code ???
>
> def sext24(d):
>     if ord(d[2]) & 0x80:
>         return d+'\xff'
>     else:
>         return d+'\x00'


I guess I assumed you knew how to read 3 bytes of data from a
file:

f = open('datafile','rb')
d = f.read(3)


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