Max/MSP 5.1.6, issue with "sizeinsamps"

Nov 24, 2010 at 10:21pm

Max/MSP 5.1.6, issue with "sizeinsamps"

Hi, the sizeinsamps message doesn’t work when you change sample rate (see the attached patch).
The problem existed in previous versions of Max also (I wrote about this in the forum 3 months ago), and I hoped for a fix in this version. Would an incremental fix be possible? It breaks some of my abstractions if I decide to change sample rate, in this case I have to close and reload the patch.

TIA
mau

– Pasted Max Patch, click to expand. –

#53535

Timothy Place

Timothy Place 10 124 40

Nov 24, 2010 at 11:25pm

Hi Maurizio,

I have pasted a fixed version of your patcher below, which should do what you want.

The thing to remember about buffer~ (which may not be obvious at first) is that it is simply a storage mechanism for samples, and its notion of the sample-rate is tied to the samples it contains rather than the sampling rate of the environment.

For example, if you read a soundfile that was recorded at 48KHz, the buffer should remain at 48KHz regardless of what the environment is running at. This is why the buffer~ has the “sr” message to set the sample-rate, as I demonstrate in the patcher below.

Hope this helps!
Tim

– Pasted Max Patch, click to expand. –

#192523

Maurizio Giri

Maurizio Giri 8 2 42

Nov 25, 2010 at 9:56am

Hi Tim, OK!

It works, thank you for the workaround.
I didn’t even know the “sr” message.

However I still think “sizeinsamps” should be fixed.
It should be, IMHO, completely unrelated to the sample rate.
i.e. whenever I send the message “sizeinsamps N” I need the buffer to contain exactly N samples, even if I switched the sample rate in the middle of the work, and no matter what the internal sample rate of buffer~ is/was/will be.

#192524

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