Hi,
At Thu, 11 Apr 2002 10:42:05 +0100,
Richard Bown wrote:
>
> Hi. Another simple one but another one I'm afraid I can't find an example for.
>
> I'm writing and reading events from the same ALSA 0.9.0 port (on the same
> duplex handle) - I receive the events correctly through snd_seq_event_input
> but the timestamps are coming back as zero even when I've started a queue
> against that handle. I presume I don't have to extract the timestamps from
> the queue itself?
you can let the sequencer-core update the timestamp of the event
automatically.
at the subscription, call snd_seq_port_subscribe_set_time_update().
a typical code would be like this:
snd_seq_addr_t sender, dest;
snd_seq_port_subscribe_t *subs;
snd_seq_port_subscribe_alloca(&subs);
// receive events from a specified port
sender.client = source_client_id;
sender.port = source_port_id;
dest.client = my_client_id;
dest.port = my_port_id;
// set up subscribe info
snd_seq_port_subscribe_set_sender(subs, &sender_addr);
snd_seq_port_subscribe_set_dest(subs, &dest_addr);
// set the queue to be used for updating time-stamps
snd_seq_port_subscribe_set_queue(subs, queue_used);
// enable time-stamp-update mode
snd_seq_port_subscribe_set_time_update(subs, 1);
// if you want to get real-time (not tick), call the
// following, too
// snd_seq_port_subscribe_set_time_real(subs, 1);
err = snd_seq_port_subscribe(handle, subs);
...
if you are using snd_seq_connect_to/from, then you need to replace
it like above.
Takashi
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