linuxaudio.org

On Sun, Sep 16, 2012 at 12:46:42AM -0700, Henner Zeller wrote:
> Over the week or so, I've build some fuse filesystem filters flac files

quoted text
> on-the-fly

> using the zita convolver. This makes it real easy to play

> around with files and filters. In particular with systems that otherwise

> don't support stream convolving, but just can read files.

Interesting project...
One thing: when skipping forward (or seeking in general)

there's no need to convolve all data up to that point.

If P is the new position and L is the lenght of the IR,

then just call Convproc->reset(), seek the input file to

P - L (or 0 if P < L), and convolve up to P. You're

computing a FIR filter, so no more history is required.
If the seek involves an output discontinuity for the user,

you could even just call Conproc->reset(), seek to P, and

proceed normally. The result will be as if there was only

silence before P.
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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