Mixing 16 bit linear PCM streams and avoiding clipping/overflow

Question

I\'ve trying to mix together 2 16bit linear PCM audio streams and I can\'t seem to overcome the noise issues. I think they are coming from overflow when mixing samples together.

Answer 1

I think they should be functions mapping [MIN_SHORT, MAX_SHORT] -> [MIN_SHORT, MAX_SHORT] and they are clearly not (besides first one), so overflows occurs.

If unwind's proposition won't work you can also try:

((long int)(sample1) + sample2) / 2