Some questions about SampleStreamer.h

Flowdeeps

I've managed to get a 155mb wav file loaded and playing into memory for a project I'm playing with currently and I'm sort of stumped for where to go from here.

The audio file is a bit strange but it comes from another source and I don't have much control over that.

soxi myfile.wav outputs the following:
Channels : 1
Sample Rate : 16000
Precision : 16-bit
Duration : 01:21:00.00 = 77760000 samples ~ 364500 CDDA sectors
File Size : 156M
Bit Rate : 256k
Sample Encoding: 16-bit Signed Integer PCM

It's a collection of 1296 unique samples, each approximately 96000 frames in length (if my math works out).

edit I think I meant 6000 samples in length. I'm still learning.

So my questions are:

Can I change the Bela playback rate from 44100 to 16000?
Can I change the position of the 'playhead'?
Can I specify how long the playback loop should be?

giuliomoro

Flowdeeps I'm still learning.

the math? 😮

Flowdeeps Can I change the Bela playback rate from 44100 to 16000?

Not officially supported. But here are instructions to obtain 8kHz, so it shouldn't be too different. https://forum.bela.io/d/242-how-to-achieve-a-different-sampling-rate/10

Flowdeeps Can I change the position of the 'playhead'?

Not with SampleStream.h, but you cold modify it. Under the hood it uses libsndfile, which would allow you to specify the start/stop frames for each file you want to load.

Ultimately, you are probably better off loading the whole file at once (using SampleLoader.h and splitting it into smaller chunks). Or using sox or matlab or python to programmatically split your large 155MB files into the smaller 6000 samples files and load them individually.