Hello,
First day with PD and already I recording and playing back audio in interesting ways. Thanks!

I need help.

My goal: I want to continually record into some storage, and be able to recall the last X seconds of the recording.

My idea: I was thinking of making a table of, say, 2 seconds in length. I'd like to have my audio source perpetually record into there. I am thinking of the recording actually pushing old samples OUT of the table, keeping the 2 seconds in the table always as the most recent 2 seconds. Then when I click, say, a toggle, I'd like to save whats in the table to the filesystem.

Question: Is this at all possible with pd? If so, how?

Please and thanks,
Marco.

@mcsilvio Hello....
You should have a look at using [delwrite~] and [vd~].........
see pd/doc/5.reference/vd~-help.pd in your pd program installation folder.
[delwrite~] continually writes to ram for a total size that you can set.......... so [delwrite~ name 2000] will write 2 seconds continuously.
[vd~] reads the audio from ram after a user defined time delay (in your case 0).........
You could then record the output of [vd~] using [writesf~]

pd/doc is a very good read!!!
David.

Or you can bang [tabwrite~] every 2 seconds with [metro 2000] and then send the message "write ./your_file_name.txt" to [s your_array_name] and it will store its contents in the same directory with your patch as a .txt file which you can open again with the message "read ./your_file_name.txt".
I just tried to save the array contents as a .wav file and it was saved, but trying to import it to Audacity asked me to import it as raw data which did work, but I think it's not a real .wav file...

These are great suggestions. So it actually looks feasible! That's great news. I'll now do the reading that was recommended. I just wanted to say thank you very much for the assistance. I'll report progress here, after I try things out.

Hi there,
After trying the delwrite~ suggestion out, it seems I could use a little more help.

I've read the pertinent docs and tried a few things out, and this is the sketch I am currently working with.

Again, my goal is to write only what is in the delay line, at a time of my choosing, to the filesystem. The problem with this sketch is two-fold:

• I am not aware of how to open the file, STOP writing to the delay line (i.e. freeze it), write its contents to the filesystem, and stop recording ALL in one bang/trigger.
• Since the delay line is always being written to, the wav file that gets saved just has all the audio generated between pressing start and stop. Again, my goal is that if the delay line is 2 seconds large, i want to take a snapshot of what's in that delay line on the click of a button.

Any further help is greatly appreciated. Please and thank you.

@mcsilvio Here you go......
This will do what you wish using [delread~] which is slightly easier...........
pre_sampled.pd
and here using [vd~].............
pre_sampled_vd.pd
David.