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midilibalsa

How to list ALSA MIDI clients without reading `/proc/asound/seq/clients`?

Is there a known way to list existing MIDI clients using the ALSA API only, without reading the special file /proc/asound/seq/clients?

I searched the ALSA MIDI API reference, and could not find any match. I believe there must be a way to achieve this using the API, otherwise that's a lot surprising.

Solution

  • As shown in the source code of aplaymidi and similar tools, ALSA sequencer clients are enumerated with snd_seq_query_next_client():

    snd_seq_client_info_alloca(&cinfo);
snd_seq_client_info_set_client(cinfo, -1);
while (snd_seq_query_next_client(seq, cinfo) >= 0) {
    int client = snd_seq_client_info_get_client(cinfo);
    ...
}