Thanks very much Clemens. I saw this function in the API, but from from the name and signature, snd_seq_ev_set_queue_pos_tick(ev,q,ttime), I thought it was a method for a single event rather for the whole queue. Could you explain what the ev argument is for and what I need to put in it; and also why its called snd_seq_ev_set_queue_pos_tick rather than snd_seq_queue_set_pos_tick ?
(I can see in the API docs this text, which I think tells what I need to put in ev, but I don't understand why this is needed, why's it not just snd_seq_queue_set_pos_tick(q,ttime) ? ((ev)->type = SND_SEQ_EVENT_SETPOS_TICK <http://www.alsa-project.org/alsa-doc/alsa-lib/group___seq_events.html#ggaef39e1f267006faf7abc91c3cb32ea40aeb233aee7f0548cd3b0fdc811c15d3ec> ,\ snd_seq_ev_set_dest <http://www.alsa-project.org/alsa-doc/alsa-lib/group___seq_middle.html#gaff2d03c7db0d6d5cfeec429d160d9459>(ev, SND_SEQ_CLIENT_SYSTEM <http://www.alsa-project.org/alsa-doc/alsa-lib/group___sequencer.html#ga5437f98c59679c92ee4d940ac643169e>, SND_SEQ_PORT_SYSTEM_TIMER <http://www.alsa-project.org/alsa-doc/alsa-lib/group___seq_port.html#ga02870ceddec24d3cc5609ec728b0cb92> ),\ (ev)->data.queue.queue = (q),\ (ev)->data.queue.param.time.tick = (ttime)) ) thanks charles On Mon, Apr 4, 2016 at 9:12 AM, Clemens Ladisch <cladi...@googlemail.com> wrote: > Charles Fox wrote: > > The midiarp.c demo in the tutorial shows how to read the tick state, > > and how to get and set the tempo. So I was expecting to find > > a function called something like snd_seq_queue_set_tick , but there > > doesn't seem to be one in the API. > > To set a queue's timer's position, send a message SND_SEQ_EVENT_SETPOS_TICK > and/or SND_SEQ_EVENT_SETPOS_TIME to the global timer port. > > There are macros snd_seq_ev_set_queue_pos_tick() and > snd_seq_ev_set_queue_pos_real() to help you construct such messages. > > > Regards, > Clemens >
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