Reading binary from a file...

[KraftDiner]

Hi!
In python I'm able to read in binary data from a file.
data = file.read() # Reads in an entire file.

However the data is 16bits per sample and python is storing the
data in a string. How do I convert that 8bit data into a list of 16
bit integers?

Note: I want generic python lists or tupels not numpy or numeric etc
etc...

[Steve Holden]

Re: Reading binary from a file...

KraftDiner wrote:[color=blue]
> Hi!
> In python I'm able to read in binary data from a file.
> data = file.read() # Reads in an entire file.
>[/color]
Note that you should open the file in binary mode to be
platform-agnostic and as portable as possible. (Just in case you aren't).
[color=blue]
> However the data is 16bits per sample and python is storing the
> data in a string. How do I convert that 8bit data into a list of 16
> bit integers?
>
> Note: I want generic python lists or tupels not numpy or numeric etc
> etc...
>[/color]
You really want the struct module here.

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC/Ltd www.holdenweb.com
Love me, love my blog holdenweb.blogs pot.com

[Laurent Pointal]

Re: Reading binary from a file...

Steve Holden a écrit :[color=blue]
> KraftDiner wrote:[color=green]
>> Hi!
>> In python I'm able to read in binary data from a file.
>> data = file.read() # Reads in an entire file.
>>[/color]
> Note that you should open the file in binary mode to be
> platform-agnostic and as portable as possible. (Just in case you aren't).
>[color=green]
>> However the data is 16bits per sample and python is storing the
>> data in a string. How do I convert that 8bit data into a list of 16
>> bit integers?
>>
>> Note: I want generic python lists or tupels not numpy or numeric etc
>> etc...
>>[/color]
> You really want the struct module here.[/color]

If all data are same 16 bits integer values, you can also see the array
module (and the fromfile() method - see docs).

A+

Laurent.

[Bryan Olson]

Re: Reading binary from a file...

KraftDiner wrote:
[...][color=blue]
> In python I'm able to read in binary data from a file.[/color]
[...][color=blue]
>
> However the data is 16bits per sample and python is storing the
> data in a string. How do I convert that 8bit data into a list of 16
> bit integers?[/color]

On the vast majority of systems, files hold sequences of
eight-bit integers. How you convert from those to your 16-bit
type depends on how the the writer of the file converted the
16-bit integer type to a sequence 8-bit integers.


--
--Bryan