> Am Montag 01 März 2010 16:19:58 schrieb J. Pauli:
>>> Hi!
>>>
>>> The commands "amidi -l" and "aplaymidi -l" report a list of raw MIDI
>>> ports
>>>
>>> and a list of client:port pairs, respectively. Is there any tool to find
>>> out the association between these (i.e., find out the client:port pair
>>> for a given raw MIDI port and vice versa)? Matching the names in the
>>> lists only works as long as there are no two devices of the same name.
>>>
>>> Thanks & kind regards,
>>>
>>> Markus
>>
>> Hi,
>>
>> the association between client-ids and cards is
>> card_number=(client_id-global_clients)/clients_per_card (integer
>> division). The values for global_clients and clients_per_card are 16 and
>> 4 or if you want to be 110% sure, have a look at your kernel source tree
>> at sound/core/seq/seq_clientmgr.c at line 57 (or something nearby
>> depending on your kernel version). But I think raw MIDI ports are
>> associated with cards only and not with client:port pairs.
> Thanks a lot, this information solves 99% of my problem! The remaining 1% is
> that I would still prefer to look up the mapping somewhere since it seems
> somewhat arbitrary, and if it changes in the future (e.g., to allow for more
> clients per card, like "640kB ought to be enough for everyone"), it will
> break
> software which uses the (hard-coded) current mapping. Any ideas about that?
>
> Thanks & kind regards,
> Markus
>
>
Well, have a look at the file sound/core/seq/seq_clientmgr.c in your
kernel source tree. This time at line 170:
int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
SNDRV_SEQ_CLIENTS_PER_CARD;
Alsa is doing exactly this (if I understand the code correctly). So the
solution to your problem would be to write a little script, which
extracts these two values and then computes the card number.
Cheers, Jan
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