[linux-audio-dev] waveform overview

[Steve Harris]

You just store the peak amplitudes (+ve and -ve sepratly) for every N
samples.

I think typically you have two seperate peak files, eg. one for every 2^8
samples and one for every 2^16.

The eqivalent in large images uses one "peakfile" for every power of two,
but audio people seem to be more conservative - for one thing scaling
audio is much cheaper.

You could look at sweep, snd, ardour, audacity etc. to see how it is done.

- Steve

On Mon, Oct 14, 2002 at 10:45:20AM +0200, Thomas Grill wrote:
> Hi all,
> can anyone give me pointers on how the overview cache for a zoomable
> waveform display is organized?
> One can see accurate and fast displays in a lot of applications but i guess
> the rendering of this is not straightforward.
> 
> best greetings,
> Thomas