src_process returns less samples than requested if the rate recently changed

Question

src_process returns less samples than requested if the rate recently changed

mbacarella opened this issue 3 years ago · 3 comments

I noticed audio that I was filtering through libsamplerate would stutter a bit right after a sample rate change. It was because src_process was producing slightly fewer samples than requested, so my audio playback buffer wasn't being completely filled.

I looked around at toy programs that use libsamplerate and saw that some of them add 64 to the input_frames after computing the ratio of input_frames.

When I add 64 to input_frames in my program it stops stuttering as well. What behavior is this relying on?

Answer 1 · 2021-09-08T04:04:07.000Z

Hi @mbacarella . II think the clue is hiding here: http://libsndfile.github.io/libsamplerate/faq.html#Q006.

Answer 2 · 2021-09-08T16:04:33.000Z

Well that indeed solves the mystery. I was not aware there was a FAQ. Thank you!

Answer 3 · 2021-09-09T06:36:06.000Z

You're welcome.