Jim Peters wrote:
>
> Abramo Bagnara wrote:
> > I think there is some misunderstanding, the solution I proposed for
> > single thread audio engine is the following:
> >
> >
> > audio_producer1 ----\
> >
> > audio_producer2 -----\ /-- audio_consumer1
> > > engine <
> > audio_producer3 -----/ \-- audio_consumerN
> >
> > audio_producerN ----/
>
> I can't make sense of this, because for me the server engine is BIG,
> enclosing all the producers and consumers, which talk amongst
> themselves inside it:
Just think to my -----> as functional link (all the things I've drawn
are in the same process) using ALSA PCM API, and then you get what
you've drawn (if I assume that +---+
| |
+---+ is the process boundary).
>
> (GUI for a plugin) (ALSA pcm_shm interface to
> || || some other process)
> +--------------------------||------------------||----------------+
> | ENGINE, containing: (more plugins) |
> | | |
> | [HW input via ALSA] -> [plugin] -> [plugin] -> (whatever) |
> | | | |
> | [plugin] <- [plugin] -> [plugin] |
> | | |
> | (whatever) -> [HW output via ALSA] |
> | |
> +-----||------------------------||-------------------------------+
> || ||
> (GUI for a plugin) (GUI for a plugin)
But with some differences:
- you assume that plugin chain is something that engine need to know
statically, while I say that engine get audio from zero or more producer
and put audio to zero or more consumer independently from what is hidden
behing them.
- a related difference is that you put at extremity two hardware while I
say that's not necessarily true.
I try to redraw my example using your graphic conventions:
GUI visual scope
+------||-----------||-------------------------------------+
| audio_producer1 ----\ |
| audio_producer2 -----\ /-- audio_consumer1 |
| > engine < |
| audio_producer3 -----/ \-- audio_consumerN |
| audio_producerN ----/ |
+-------||-----------------------------------||------------+
appl file writer thread
Now, let's zoom on audio_producer1:
GUI visual scope
|| ||
------------------||--------||-------
|| ||
HW capture -> plugin -> meter ->
Zoom on audio_producer2:
GUI
||
------------||----
||
file -> plugin ->
Zoom on audio_producer3:
appl -> pcm_lbserver
||
-----||--------------
||
pcm_shm ->
Zoom on audio_consumer1:
-> pcm_file_writer -> HW playback
||
-----------||-------------------------
||
File writer thread
All is limited only by your fantasy and mips available ;-)
--
Abramo Bagnara mailto:[EMAIL PROTECTED]
Opera Unica Phone: +39.546.656023
Via Emilia Interna, 140
48014 Castel Bolognese (RA) - Italy
ALSA project http://www.alsa-project.org
It sounds good!
