Forums > MaxMSP

importing samples smaller than a buffer without resizing it

April 3, 2013 | 11:56 am

Hello all, I am trying to import a sample that is smaller than the buffer it is being imported into, but when I import it, [buffer~] shrinks to accomodate it. I have been using [read sample.aiff 0 1000] to try and restrict the buffer size to 1000ms in all instances, this works fine for longer samples i.e any thing above 1000ms, but if I want to import a very short sample, one below 1000ms, [buffer~] shrinks. Any ideas?


April 3, 2013 | 2:05 pm

Hi
afaik, the read message should do this as you describe, according to the helpfile. It must be your additional arguments specifying start and end. I’m guessing you’re importing a section of a larger file? Can you ‘pre-crop’ and then use a less specific read message?


April 3, 2013 | 2:26 pm

Thanks for the reply n00b, right I have refined the problem a little more, if I read a file using a read message directly into the [buffer~] (which opens the file browser) this works perfectly, when I use [dropfile] with [prepend read] this doesn’t work as described above. Here is a reduced patch:

– Pasted Max Patch, click to expand. –

April 3, 2013 | 2:57 pm

Yeah, same behaviour here. Nothing specific about dropfile in the [buffer~] reference for "read" either. And I tried a [read $1] message from [dropfile]; it behaves in the same way. I wonder does the header data specify file length, which is then passed to [prepend read] and [buffer~], where the "open browser via read" doesn’t?? Do I need to read the documentation more thoroughly?

Brendan


April 3, 2013 | 3:12 pm

Thanks again for your feedback, I’ve been through a fair amount of documentation, can’t find anything yet, could this be a bug?


April 3, 2013 | 3:32 pm

Hi Barry,

I re-read your OP; if you use dropfile plus the following message:

read $1 0 1000

If the dropped file is < 1000 (or whatever size presented as the above 3rd argument) the buffer will NOT crop to the file length!

Is this what you need?

– Pasted Max Patch, click to expand. –

Brendan


April 3, 2013 | 3:35 pm

I think my method is a cheat – "read" does not resize the buffer (as we know); what happens is the buffer is "resized" by the first "read $1 blah blah" message, to it’s original size….

This did crash on me once a few moments ago, but I think it was just impatient clicking.

Brendan


April 3, 2013 | 3:38 pm

Hi Brendan, for some reason this isn’t working for me, it’s defaulting to the same behaviour as before. :(


April 3, 2013 | 3:40 pm

Are you on a PC or a Mac? I’m on a Mac, just thought that might be the issue here…


April 3, 2013 | 3:45 pm

Really?

1. buffer is sized via loadbang;
2. browse to audio files via "read" and import something (< bufsize ms);
3. drop audio file via dropbox –> "read $1 0 bufsize*ms" message;
4. no cropping should ensue.

New version:

– Pasted Max Patch, click to expand. –

Brendan


April 3, 2013 | 3:47 pm

Windoze, but testing with the bundled aiff filetype


April 3, 2013 | 3:52 pm

Yeah, this still crops at my end so perhaps Crapintosh is the issue after all. Thanks for testing this at your end Brendan!


April 3, 2013 | 3:56 pm

Windoze?

Crapintosh?

Linux ! ! !

Shame I couldn’t help, kind of. Must be doubly frustrating knowing I’m sitting here looking at a solution :)

Brendan


April 3, 2013 | 3:57 pm

Well when you put it like that! ;)


April 3, 2013 | 4:03 pm

One last question:

Are the audio files stored in a location known to Max?, ie have you tried this both with the files in /examples/sounds, and your own soundfiles? Might be trivial, but this dictates whether a browser opens or not – might have some bearing.

Hate leaving unsolved!

Brendan


April 3, 2013 | 4:07 pm

No there not, and they can;t be really as I’m intending people to drag and drop files off of their desktops (or what ever file they wish).


May 2, 2013 | 3:26 pm

hello Barry Farrimond…hello n00b_meister…
i believe that this is a bug of max6(i am not sure from which version)…
the same patch is giving different results in max5 vs max 6..
max5 read message does not resize the buffer(as it should) when version 6 resize the buffer…
(also in max4.5 does not resize the buffer!)

– Pasted Max Patch, click to expand. –

May 2, 2013 | 5:48 pm

Hi all,

We are currently looking at some regression issues with buffer~, this being one of them. There are a number of differences that have cropped up in Max 6, and although I can’t say when or if we will have fixes for them, we are going to be taking a closer look in the near future.

Thanks,
-Ben


May 2, 2013 | 6:32 pm

The patch posted by N00b_meister seems to work for me (Max 6.1.2 on Mac OSX 10.6.8)


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