linuxaudio.org

On 04/04/2011 08:17 AM, Arnold Krille wrote:

quoted text
> On Monday 04 April 2011 07:55:02 Patrick Shirkey wrote:

>> So puredata can't buffer 4 hours of data? Is that a limitation of  the

>> available memory or the internal format or what? Ardour can records for

>> at least 10 hours non stop.

>

> Ardour records to disk, puredata's delay buffers in memory.

>

>> Maybe ecasound is a better tool for this procedure?

>

> A "delay" of four hours can only be implemented involving the harddisk. Unless

> you have an incredible amount of ram.

48000 SPS * 4bytes/sample * 3600sec/h * 4h

= 2764800000 ~ 2.5 GBytes  (per channel)
on 32bit machines you'll run out of address space even with enough RAM.
> I think a homebrewn solution is to use here. And that is my idea:

quoted text
> One app/script to record to disk and start a new file every hour with the

> timestamp in the filename for debugging.

> Another app to play the files at the wanted time.

>

> That way any delay bigger then the interval of the first apps files can be

> created.

If you want _exactly_ 4 hours (and not 4 hours + 1 ms) it's easier to

count samples and compensate latency in the same app.
2c,

robin

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