i'm trying to write a midi processor. in the end i will use alsa hardware 
midi devices, but while i'm at the coffee shop i have vkeybd and timidity.

sr     = 48000
kr     =  4800
ksmps  =    10
nchnls =     2

instr 11
   kstatus kchan kpch kvel midiin
                           midion kchan, kpch, kvel
endin

i can run the portmidi driver with the following command:

csound -odac -+rtmidi=portmidi -Q1 -M1 -d  passthrough.orc passthrough.sco

but i don't want to have to tie up the audio just to have the score render 
in realtime. is there a flag to force realtime performance with non-audio 
processing  .orcs?

i would also like to use the alsalayer directly instead of using the 
portmidi but the syntax of virtual (non-harware) midi ports is unclear 
to me in the manual.

[khirai@lap drumlooper]$ aconnect -o
client 14: 'Midi Through' [type=kernel]
     0 'Midi Through Port-0'
client 129: 'TiMidity' [type=user]
     0 'TiMidity port 0 '
     1 'TiMidity port 1 '
     2 'TiMidity port 2 '
     3 'TiMidity port 3 '
[khirai@lap drumlooper]$ aconnect -i
client 0: 'System' [type=kernel]
     0 'Timer           '
     1 'Announce        '
client 14: 'Midi Through' [type=kernel]
     0 'Midi Through Port-0'
client 128: 'Virtual Keyboard' [type=user]
     0 'Virtual Keyboard'




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Hi everyone,

I have just updated the 5.12 package, 5.12.4. This has been built with  
full optimisation turned on, something I did not realise had not been  
done before. Performance gains are substantial, for instance,  
trapped.csd goes from 7.9 secs to 3.4 secs. I expect these to be  
across the board, so I suggest updating to it.

Thanks to Oeyvind and his student for pointing out that Csound on OSX  
was slower than it should have been.

Regards

Victor


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Thanks Victor. This is great news!

Best,
Peiman

On 4 May 2010, at 18:10, Victor Lazzarini wrote:

> Hi everyone,
>
> I have just updated the 5.12 package, 5.12.4. This has been built  
> with full optimisation turned on, something I did not realise had  
> not been done before. Performance gains are substantial, for  
> instance, trapped.csd goes from 7.9 secs to 3.4 secs. I expect these  
> to be across the board, so I suggest updating to it.
>
> Thanks to Oeyvind and his student for pointing out that Csound on  
> OSX was slower than it should have been.
>
> Regards
>
> Victor
>
>
> Send bugs reports to the Sourceforge bug tracker
>           https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body  
> "unsubscribe csound"
>



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I looked at "csound --help" and there's a flag for "--nosound".  The
manual says:

-n, --nosound
No sound. Do all processing, but bypass writing of sound to disk. This
flag does not change the execution in any other way.

the --help says "no sound onto disk or device".

I haven't tried this at all but may be worth trying.

On Sun, May 2, 2010 at 2:49 PM, kelly  hirai  wrote:
> i'm trying to write a midi processor. in the end i will use alsa hardware
> midi devices, but while i'm at the coffee shop i have vkeybd and timidity.
>
> sr     = 48000
> kr     =  4800
> ksmps  =    10
> nchnls =     2
>
> instr 11
>  kstatus kchan kpch kvel midiin
>                          midion kchan, kpch, kvel
> endin
>
> i can run the portmidi driver with the following command:
>
> csound -odac -+rtmidi=portmidi -Q1 -M1 -d  passthrough.orc passthrough.sco
>
> but i don't want to have to tie up the audio just to have the score render
> in realtime. is there a flag to force realtime performance with non-audio
> processing  .orcs?
>
> i would also like to use the alsalayer directly instead of using the
> portmidi but the syntax of virtual (non-harware) midi ports is unclear to me
> in the manual.
>
> [khirai@lap drumlooper]$ aconnect -o
> client 14: 'Midi Through' [type=kernel]
>    0 'Midi Through Port-0'
> client 129: 'TiMidity' [type=user]
>    0 'TiMidity port 0 '
>    1 'TiMidity port 1 '
>    2 'TiMidity port 2 '
>    3 'TiMidity port 3 '
> [khirai@lap drumlooper]$ aconnect -i
> client 0: 'System' [type=kernel]
>    0 'Timer           '
>    1 'Announce        '
> client 14: 'Midi Through' [type=kernel]
>    0 'Midi Through Port-0'
> client 128: 'Virtual Keyboard' [type=user]
>    0 'Virtual Keyboard'
>
>
>
>
> Send bugs reports to the Sourceforge bug tracker
>           https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> csound"
>
>


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> I looked at "csound --help" and there's a flag for "--nosound".  The
> manual says:
>
> -n, --nosound
> No sound. Do all processing, but bypass writing of sound to disk. This
> flag does not change the execution in any other way.
>
> the --help says "no sound onto disk or device".
>
> I haven't tried this at all but may be worth trying.

I think thi swill not work.  -n related to disk-output which is as fast as
possible.  Out needs to go through a rtaudio interface to get the
throttling effect.  One could use rtjack, or a fake device.  I suspect
that the requirement is for a rtnull which is time linked but not playing
stuff.  I do not think we have this and I do not know how to do it either.

==John ff



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