Completely unimplemented, it seems:
for (ch = 0 ; ch < channels ; ch++) for (k = ch ; k < channels * frames ; k += channels) out [k] = in [k] ;
Completely unimplemented, it seems:
for (ch = 0 ; ch < channels ; ch++)
for (k = ch ; k < channels * frames ; k += channels)
out [k] = in [k] ;