[LAU] perhaps why some of us have more trouble w/ pulseaudio than others (ICE1712/M-audio delta problem w/ pulseaudio)

Paul Davis paul at linuxaudiosystems.com
Wed May 12 15:59:56 UTC 2010


On Wed, May 12, 2010 at 11:54 AM, Pedro Lopez-Cabanillas <
pedro.lopez.cabanillas at gmail.com> wrote:

>
>
> The ALSA sequencer API may be implemented in user space, offering a way to
> existing applications to be used with the new sequencer in a transparent
> way.
> That would be nice and consistent with our (Linux audio users) priced
> freedom
> of choice. I know that it is not the easy path, but would be consistent
> with
> the efforts of the ALSA people providing an OSSv3 compatibility API.
>

which probably fucked up linux audio more than anything else for the last 10
years.

Not only that, but Jack MIDI forces to the MIDI applications to always be
> used
> subordinated to an audio stream. Even when you don't want to use digital
> audio at all, because your MIDI sources and receivers are all external
> musical instruments.
>

that's an artifact. for now, just run jackd -d dummy and fire up a2jmidid
-e. no audio is flowing anywhere at all.

Another drawback is that if you want to succeed replacing an existing API,
> you
> need to provide at least every functionality provided by the old one, and
> do
> it in a nice way that can be adopted easily by the developers. I understand
> that the ALSA sequencer API is huge and cumbersome, but the minimalist
> approach of Jack MIDI may be just another mistake in the opposite
> direction.
>

if you can expand on what that direction might be, it could be useful.

there are issues that i have with the JACK MIDI concept, but they are clear
and simple (and the diametric opposite of those with ALSA sequencer).
specifically:

  * ALSA sequencer is bad for synthesis because data arrives in the wrong
thread at the wrong time; its good for MIDI control  because the data does
not arrive
       in the RT process() thread
  * JACK MIDI is good for synthesis because data arrives in the right thread
at the right time; its bad for MIDI control because the data arrives in the
      RT process() thread
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