Looper example on Patch

hatty · July 3, 2020, 8:24am

I just got the Patch in the mail and immediately went to work adapting the looper in the pod examples to work with the Patch controls. So much fun!

I made it into a sort of punch-in dub looper. I thought I should see if it made sense to put it into the examples.

The current master branch could be considered a simple adaptation for the examples. It’s 98% the same code.

loopmasta · September 28, 2020, 4:17pm

Would love to see it in action. Maybe a youtube video? How do you like the overall performance e.g. latency and sound?

toyosm · October 6, 2020, 2:16pm

How long is the looping time?

hatty · October 12, 2020, 9:40pm

github.com

misterinterrupt/PatchLooperExample/blob/master/Looper.cpp#L5


#include <string>
#include "daisysp.h"
#include "daisy_patch.h"

#define MAX_SIZE (48000 * 60 * 5) // 5 minutes of floats at 48 khz

using namespace daisysp;
using namespace daisy;

static DaisyPatch patch;

bool first = true;  //first loop (sets length)
bool rec   = false; //currently recording
bool play  = false; //currently playing
std::string modeStrs[] = {"stopped", "playing", "recording"};

here’s the max time

hatty · October 12, 2020, 9:42pm

There are no performance, sound, or latency problems at all

toyosm · October 12, 2020, 9:59pm

Oh!, I missed that. Thank you!

MakingSoundMachines · February 3, 2021, 11:31pm

@shensley I was wondering about the max sample length here …

If we have a total RAM Size of 64MB so 67108864 byte and a float has 4 byte, we get 16777216 / 48000 = 349.525333333 sec of sample time.

Wouldn’t it be possible to capture the raw input in 16bit and get double the sample length here? Then convert to float when reading the values stored in RAM? Or is that too slow?

shensley · February 3, 2021, 11:48pm

Yeah, that approach could definitely work. I’ve actually done similar stuff to squeeze longer delays on boards with a lot less RAM.

just a quick daisy::f2s16() before writing to a delayline, and then daisy::s162f() would do the trick. The daisysp DelayLine class is a template so you can easily just change any existing delay lines to a 16-bit int type (i.e. int16_t, short, etc.) and you should be good to go.

antisvin · February 4, 2021, 8:39am

You could go full lofi and borrow uLAW encoding from the Clouds sources!

MakingSoundMachines · February 5, 2021, 4:09pm

Thank you for your response! That looks great - I will try that!