MPS_FRAME_LEN
buf += MPS_FRAME_LEN * numframes;
len -= MPS_FRAME_LEN * numframes;
hexdump(frame, MPS_FRAME_LEN, NULL, 0);
frame += MPS_FRAME_LEN;
hexdump(frame, MPS_FRAME_LEN, NULL, 0);
while (len >= MPS_FRAME_LEN) {