[LAD] A question about audio file interfaces

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To: Linux Audio Developers <linux-audio-dev@...>
Date: Saturday, November 30, 2013 - 10:57 pm

These questions are really directed to Paul Davis (as the
main Ardour dev), Erik de Castro Lopo (libsndfile author),
and anyone with experience in this field.

Imagine a real-time audio processing app reading (or writing)
lots of audio files, possibly evaluating a complex timeline
consisting of many separte pieces. To make things work some
(or a lot of) buffering and lookahead will be necessary.

There are at least three distinct places where this can be
done:

1. the file system(s) and kernel
2. any library used to acess audio files,
3. the application itself.

Of these, only (1) will be aware of any hardware related
issues, and only (3) will be aware of what is expected to
happen in the (near) future. (2) sits somewhere between
the two.

In view of this, what is currently the best way for an
app to read/write audio files, the basic read() and write()
calls, or the stdio interface ?

More specifically, if one would write a library to access
a particular audio file format (not supported, or only
partially by e.g. libsndfile), how 'smart' in terms of
buffering, lookahead etc. should that library be, or not
try to be, in order to perform well with apps like e.g.
Ardour ? What form would the preferred API take ?

Ciao,

--
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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Messages in current thread:
[LAD] A question about audio file interfaces, Fons Adriaensen, (Sat Nov 30, 10:57 pm)
Re: [LAD] A question about audio file interfaces, Fred Gleason, (Sun Dec 1, 3:42 am)
Re: [LAD] A question about audio file interfaces, Erik de Castro Lopo, (Sun Dec 1, 1:43 am)
Re: [LAD] A question about audio file interfaces, Devin Anderson, (Sun Dec 1, 12:32 am)
Re: [LAD] A question about audio file interfaces, Fons Adriaensen, (Sun Dec 1, 11:48 am)
Re: [LAD] A question about audio file interfaces, Paul Davis, (Sun Dec 1, 2:08 pm)
Re: [LAD] A question about audio file interfaces, Fons Adriaensen, (Sun Dec 1, 4:49 pm)
Re: [LAD] A question about audio file interfaces, Paul Davis, (Sun Dec 1, 4:58 pm)
Re: [LAD] A question about audio file interfaces, Fons Adriaensen, (Sun Dec 1, 6:43 pm)
Re: [LAD] A question about audio file interfaces, Paul Davis, (Sat Nov 30, 11:07 pm)