Re: Audio playback and classes

[Michael Goffioul]

On Fri, Jun 28, 2013 at 3:51 AM, Vytautas Jancauskas <address@hidden> wrote:

I am a bit confused how to handle variable bit depth audio data. Audio
files come in different variates, like 8 bit, 16 bit, 24 bit, etc.
These bit depths give different value ranges. From what I understand
from matlab documentation it takes in to account the type of values
the array to be played back contains (e.g. int8, int16, uint16, etc).
But in octave I cannot get that type or at least I don't know how (the
numeric arrays are all treated as if they were arrays of doubles
right?) I need this information for correct playback. There are two
options for dealing with this I can think of:

a) Guess the type of array by seeing what values the array elements take.
b) Limit the values to real values in the range (-1.0, 1.0) and make
the user take care of conversion to that format themselves.

Are there any suggestions about this?

Maybe I misunderstood your question, but octave supports intXX and uintXX types and you can get that type through the "class" function, like the following:

octave-cli:2> class(int8(rand(1,10)*256))

ans = int8

Michael.