Get min and max values from the buffer~ without playing it

javascript to the rescue!

save this code as bufMinMax.js :

outlets = 2;
var buf;
function bufname(name)

{
     buf= new Buffer(name);
     var frames = buf.framecount()
       var samples = new Array;
           samples= buf.peek(1, 0, frames);
           var max= -99999999.;
           var min = 99999999;

    for (var i=0; i<frames; i++){
            if (samples[i]>max)
            max=samples[i];
            if (samples[i]<min)
            min=samples[i];
                }
        outlet(1, max);
        outlet(0, min);
}


then load this patch:

only works for single channel buffers, but you could adapt the code

hey, thanks a lot :)

this is very neat solution. clean and efficient.

any hints on how to adapt this script to 3 channel buffer? i never worked with js so don't know where to start :(

klif

the 1st arg in this:

buf.peek(1, 0, frames);

is the channel nmbe

kbd n wkng :-(

hahahaha. hope your keyboard gets well.

so i could make 6 outputs, and repeat routines with appropriate channel numbers.

buf.peek(2, 0, frames);

buf.peek(3, 0, frames);

actually i just made multuple js objects with code modifications- one for each channel. so fa so good. thanks again :)

hm, i suspect possible bugs here.

i get different results from minmax object and js. both are kind of inconsistent.

i made a test patch that demonstrates this behaviour. will post it to forums in a separate thread.

and javascript

ok got a new keyboard;-)

you've got a number of small errors in the patch, mainly to do with message ordering--

here's a modified version:

note that the float outputs of minmax are consistent with my js version-- the sig min output goes to zero because the input goes to zero (output of play~) when it gets to the end of the buffer