snd_rawmidi_framing_tstamp
struct snd_rawmidi_framing_tstamp *dest_ptr;
struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec };
int frame_size = sizeof(struct snd_rawmidi_framing_tstamp);
dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr);