Read header and data from a binary file [LONG]
Gabriel Genellina
gagsl-py2 at yahoo.com.ar
Fri Sep 25 04:47:39 EDT 2009
En Tue, 22 Sep 2009 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
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