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

[Joachim Deguara]

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 at idmt.fraunhofer.de
Fraunhofer IDMT, Langewiesener St. 22, 98693 Ilmenau, Germany
Phone: +49 3677/69-4851 		Fax:   +49 3677/69-4399