Re: [linux-audio-dev] Two / Three HDSPM Cards?

problem found. Jack is not the culprit rather alsa. In alsa lib's
pcm_multi.c you need to change the line

char slave_map[32][32] = { { 0 } };
to
char slave_map[64][64] = { { 0 } };

I'll send a patch to the alsa people.
have fun
-joachim

Joachim Deguara wrote:
> Hi, thre Madi cards in one PC is a great idea. But the real trick is
> getting the CPU to process 192 ins onto 192 outs!
>
> I also saw the typo and I hate hand generating long lists of incremented
> values, which is quite error prone. So I wrote a script (attached). I
> tried it out with our Madi cards. By experementing I have found that
> multi card works with <= 32 channels per card for two cards!! So max of
> 64 in/outs. where is this from ?! I had increased the max port count to
> 256 but that didn't help.
>
> -joachim
>
> Clemens Ladisch wrote:
>
>> Audio Developer wrote:
>>
>>> bindings.112.slave b;
>>> bindings.112.channel 56;
>>
>>
>>
>> This is the 113th channel.
>>
>>
>>> pcm.hdspm_112 {
>>> type multi;
>>> slaves.a.pcm hdspm_0;
>>> slaves.a.channels 56;
>>> slaves.b.pcm hdspm_1;
>>> slaves.b.channels 56;
>>> bindings.0.slave a;
>>> bindings.0.channel 0;
>>> bindings.1.slave a;
>>> bindings.1.channel 1;
>>> ...
>>
>>
>>
>> The same definition could be written in the following form:
>>
>> pcm.hdspm_112 {
>> type multi
>> slaves.a {
>> pcm hdspm_0
>> channels 56
>> }
>> slaves.b {
>> pcm hdspm_1
>> channels 56
>> }
>> bindings [
>> { slave a channel 0 }
>> { slave a channel 1 }
>> { slave a channel 2 }
>> ...
>> { slave a channel 55 }
>> { slave b channel 0 }
>> ...
>> { slave b channel 55 }
>> ]
>> }
>>
>>
>> HTH
>> Clemens
>>
>
>

-- 
Joachim Deguara				Email: dga@email-addr-hidden
Fraunhofer IDMT, Langewiesener St. 22, 98693 Ilmenau, Germany
Phone: +49 3677/69-4851 		Fax:   +49 3677/69-4399