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Date: Wed, 16 Jul 2014 11:32:30 -0700
From: "Russell L. Carter" <rcarter@pinyon.org>
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To: freebsd-multimedia@freebsd.org
Subject: Re: audacity crashes recording
References: <53BDD5CE.50903@pinyon.org> <53BDDA33.5000802@selasky.org>
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On 07/09/14 17:48, Russell L. Carter wrote:
>
>
> On 07/09/14 17:11, Hans Petter Selasky wrote:
>> On 07/10/14 01:52, Russell L. Carter wrote:
>
>>> Anybody got audacity working with OSS? Possibly with
>>> snd_uaudio?
>>>
>>
>> Yes, it works, but you need to compile it with possibly another audio
>> backend.
>
I got a reply off-list of "My Audacity is using portaudio, and that
seems to work."
So I did some digging, and for the benefit of others who do not
already know the last 20 years of sound subsystems history, here is
what I have found so far (probably some mistakes; I'd appreciate
corrections).
First, there are two different OSS implementations:
1. audio/oss: opensound.com OSS, currently at version 4.2. I got OSS
v4.2 loaded but it doesn't see my USB sound device.
2. Native FreeBSD OSS, which is apparently a complete rewrite of
opensound.com OSS v3, documented in
http://www.opensound.com/pguide/oss.pdf. In what follows, I'm
going to label native FreeBSD OSS "OSS-FreeBSD".
My USB device is
uaudio0: <Burr-Brown from TI USB Audio CODEC, class 0/0, rev
1.10/1.00, addr 9>
Sound output works great on OSS-FreeBSD.
# cat /dev/sndstat
Installed devices:
pcm0: <USB audio> (play/rec) default
There are two portaudio ports:
1. audio/portaudio, which is actually portaudio 1.8, and apparently has
support for OSS-FreeBSD. It has no support for alsa.
2. audio/portaudio2 which is actually portaudio 1.9, and apparently has
no support for OSS-FreeBSD. It does have robust support for alsa.
Now audio/audacity also includes portaudio 1.9, which is always
enabled. So, first tip, don't bother with installing either of the
audio/portaudio ports to support audacity.
So apparently I need to get alsa working. Alsa has a plugin,
installed by audio/alsa-plugins: libasound_module_pcm_oss.so. This
enables alsa to talk to OSS-FreeBSD. (I am guessing)
So audacity is going to talk to our sound devices by traversing the
following compatibility layers:
audacity <-> portaudio-1.9 <-> alsa <-> OSS-FreeBSD <-> sound device
Seems suboptimal, but heh. If it works, great!
However, audacity doesn't see my recording device, and indeed
# arecord -l
arecord: device_list:279: no soundcards found...
# arecord -L
null
Discard all samples (playback) or generate zero samples (capture)
My /usr/local/etc/asound.conf is copied from the distribution version
of asound.conf.sample installed by audio/alsa-lib. I haven't got google
to cough up any examples of modifying it, though it's not clear that
it's the problem. My sound device is /dev/dsp0.0.
Any ideas on how to get alsa to recognize the rec device?
Thanks,
Russell