[raspberry-vi] Re: Pulse Audio, Lib AIO alsa, etc.

  • From: Gregory Osborne <Gregory.Osborne@xxxxxx>
  • To: "raspberry-vi@xxxxxxxxxxxxx" <raspberry-vi@xxxxxxxxxxxxx>
  • Date: Wed, 9 Apr 2014 15:25:33 +0000

Mike and all,
I am not the best one to address this as I too find this confusing.

The wiki I addressed in my prior post -- the arch linux pulse audio wiki -- 
states that pulse audio is an audio proxy sound system.

Going off of that, I would assume your latter statement, Mike that 
putting 'alsa' in the speech-dispatcher config file just mean pulse is being 
bypassed and sd is going straight to ALSA?
Would probably be correct.

- Greg



-----Original Message-----
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[mailto:raspberry-vi-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Ray
Sent: Wednesday, April 09, 2014 10:19 AM
To: raspberry-vi@xxxxxxxxxxxxx
Subject: [raspberry-vi] Re: Pulse Audio, Lib AIO alsa, etc.


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Greg, thanks for this.  I might need to re-address pulse at some point because 
it is better than ALSA and possibly other things when trying to play more than 
one audio stream at a time.

Actually while we are on the subject of pulse and audio, there is some stuff I 
still don't understand...

In the speech-dispatcher configuration file it is possible to configure sd for:

ALSA
pulse
libao
NAS
OSS

Disregarding OSS and NAS for now because I don't think they have anything for 
us on the Pi, looking at the Makefile for espeak, espeak can be configured to 
use:

pulse
ALSA
portaudio

Now I don't understand the relationship of these things.

The default configuration of espeak if the Makefile is not changed is to use 
pulseaudio if the server is running, else fall back and use portaudio.  But 
reading your mail Greg and some other stuff there is the suggestion that 
pulseaudio can be configured to use ALSA.

What I am consused about is there seems to be some contradiction of the 'level' 
at which these things are relevant.

In simple terms, if it is possible to configure pulseaudio to use ALSA, making 
a mini diagram like this true:

pulseaudio ---> ALSA

Then why is it also possible to put either 'pulse' or 'alsa' in the 
speechd.conf file?

See the confusion?

Or would putting 'alsa' in the speech-dispatcher config file just mean pulse is 
being bypassed and sd is going straight to ALSA?

Confusing eh?

Mike


On 09/04/2014 15:51, Gregory Osborne wrote:
> First off, Mike, congratulations on all the progress. I know you’ve been 
> working long enough and hard enough at it – that and it’s been a hard enough 
> nut to crack.
> Second – to Mike and anyone else interested.
>
> When I tried configuring pulse audio, I had no success on the Pi, but on my 
> AMD arch computer I was able to get pulse audio working by adding a couple of 
> lines into one of the configuration files referencing it to use alsa.
>
> I got that information from the arch linux pulse audio wiki and that same 
> wiki has info on using pulse with lib aio.
>
> That wiki is available at:
> https://wiki.archlinux.org/index.php/PulseAudio
>
> - Greg
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>


--
Michael A. Ray
Analyst/Programmer
Witley, Surrey, South-east UK

The box said: 'install Windows XP, 7 or better'. So I installed Linux

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===========================================================
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Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
-----------------------------------------------------------
Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi 
Foundation.

This list is not affiliated to the Raspberry Pi Foundation and the views and 
attitudes expressed by the subscribers to this list do not reflect those of the 
Foundation.

Mike Ray, list creator, January 2013

=========================================================== 
The raspberry-vi mailing list 
Archives: //www.freelists.org/archives/raspberry-vi
Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
-----------------------------------------------------------
Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi 
Foundation.

This list is not affiliated to the Raspberry Pi Foundation and the views and 
attitudes expressed by the subscribers to this list do not reflect those of the 
Foundation.

Mike Ray, list creator, January 2013

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