Subject: Re: [linux-audio-dev] waveform overview
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Mon Oct 14 2002 - 12:08:20 EEST
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
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