Re: snd_seq_system_info_get_cur_ports function

Re: snd_seq_system_info_get_cur_ports function

[Jose B]

Dear Devs,

I've been working on a wrapper to oversimplify using the alsa midi 
sequencer, and for it I was writing a function to quickly check if any 
new ports were registered on the sequencer after the application using 
the wrapper starts up. I noticed there is no function for getting the 
current port count but there is one for getting the current number of 
sequencer clients :

snd_seq_system_info_get_cur_clients(const snd_seq_system_info_t *info)

Shouldnt there be a corresponding function for getting the current port 
count as seen below? Or is it just missing from the documentation?

snd_seq_system_info_get_cur_ports(const snd_seq_system_info_t *info)

    -- It doesn't show in code::blocks' autocomplete so i'm guessing it
    wasn't written yet.

Is anyone willing to check this out please? It would be really handy to 
have this func.

Thanks, and happy dev-ing

Jose'

Re: snd_seq_system_info_get_cur_ports function

[Clemens Ladisch]

Jose B wrote:
> Shouldnt there be a function for getting the current port count as seen below?
>
> snd_seq_system_info_get_cur_ports(const snd_seq_system_info_t *info)

There is no such value:
<https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/sound/asequencer.h#n308>

> I was writing a function to quickly check if any new ports were registered
> on the sequencer after the application using the wrapper starts up.

The number of ports is not helpful for detecting all changes.

Subscribe to port 0:1 (SND_SEQ_CLIENT_SYSTEM:SND_SEQ_PORT_SYSTEM_ANNOUNCE) to
receive events for any changes.


Regards,
Clemens