Trying to understand some random excerpts of coding. I believe is C++

[ScottDay96]

These codes were given to me by a friend and asked if i could understand any of it. It links to a piece of music somehow(?). It is slightly mashed together but should link together in some way. I know this seems like an impossible task with little/no context. Thanks for any light you may be able to shed on this situation.

~0x000F

s1: 0xFFF0 s2: 0x000F

s1=s&0xFFF0;s2=s&0x000F<<12

double scaled = double(samples2[(i*ch2)%count2])/65535.0;
mixSamples[i] = (samples1[(i%count1)*ch1]&0xFFF0) | (unsigned short)(scaled*15);

[weaknessforcats]

Maybe the best thing is for you to tell me what you this this code means. I don't want to write a huge explanation when the answers are in any C++ textbook.