Read header and data from a binary file [LONG]

Fri Sep 25 04:47:39 EDT 2009

En 2009年9月22日 18:18:16 -0300, Jose Rafael Pacheco 
<jose_rafael_pacheco at yahoo.es> escribió:
> Hello,
>> I want to read from a binary file called myaudio.dat
> Then I've tried the next code:
>> import struct
> name = "myaudio.dat"
> f = open(name,'rb')
> f.seek(0)
> chain = "< 4s 4s I 4s I 20s I I i 4s I 67s s 4s I"
> s = f.read(4*1+4*1+4*1+4*1+4*1+20*1+4*1+4*1+4*1+4*1+4*1+67*1+1+4*1+4*1)

> a = struct.unpack(chain, s)

Easier:
fmt = struct.Struct(chain)
s = f.read(fmt.size)
a = fmt.unpack(s)
> The audio data length is 300126, now I need a clue to build an array with
> the audio data (The Chunk SDA_), would it possible with struct?, any 
> help ?

The chunk module (http://docs.python.org/library/chunk.html) is designed 
to work with such file format.
-- 
Gabriel Genellina