MythFrontend doesn't work with some sound systems

[Jeremy Nickurak <mythtv-bugs@…>]

2007-06-11 10:19:20.441 AudioOutput? Error: Access type not available: Invalid argument

After some discussion on IRC in #pulseaudio :

<mezcalero> the problem is here

​http://svn.mythtv.org/svn/trunk/mythtv/libs/libmyth/audiooutputalsa.cpp
it assumes that SND_PCM_ACCESS_MMAP_INTERLEAVED is available
that assumption is bogus
only normal PCI hw has mmap
it's the same issue why we have trouble to support quake with padsp
people just assume that mmap is available everywhere
they should stop doing that

<mezcalero> atrus: you might want to file a bug and tell them that they need to fix their code
<mezcalero> otherweise they will always have trouble with software backends

or with a little bit more exotic audio hardware
and i really wonder why they do that in the first place.

[wberrier@…]

myth works fine for me without MMAP (although I didn't try digital out).

Looking at the history, MMAP has been used from the beginning of the alsa support.

Any reason this simple patch shouldn't be committed? Native alsa continues to work, and it allows myth to be used with the PulseAudio? alsa-plugin.

[wberrier@…]

Fall back to non-mmap if mmap isn't available

[wberrier@…]

Here's an updated patch, mythtv_alsa_non_mmap_fallback.patch, so that people who really want mmap will have no objections to this fix.

[wberrier@…]

Fall back to non-mmap if mmap isn't available (same patch, but include full path to changes files in diff)

[anonymous]

Was this patch merged into trunk?

[wberrier@…]

No, this patch has not been committed.

[coling]

Just tried this patch and it fixed my pulseaudio/myth problems, so unless there is any specific reason not to, can someone apply it to trunk please?

[mythtv-bugs@…]

Likewise here, it's made my usage of myth substantially happier.

[anonymous]

I would also like to see this change commited, as it would make MythTV work with PulseAudio? without problems :)

[danielk]

(In [14785]) Fixes #3598. Applies patch from Wade Berrier to fall back to RW_INTERLEAVED ALSA access if MMAP access fails.

[anonymous]

Bug Report for Ubuntu

​https://bugs.launchpad.net/ubuntu/+source/mythtv/+bug/162539

[amessina@…]

Could this be ported to 0.20.x-fixes branch for those (many) who use Axel Thimm's RPMs in Fedora 8?

[wberrier@…]

I would also like to see this committed to the 'fixes' branch so it would be included in packman's mythtv packages.

[hasuf@…]

filed a new ticket, #4225 for the backport.

[pembo13@…]

What is the status of this? I have mythtv-frontend-0.21-192.fc9.i386 from ATrpms and I can't hear a thing on my F9 system with PulseAudio?. I'm trying to determine if the patch simply isn't in, if it's not in the RPM that I have, or if it's a problem local to my machine.

[wberrier@…]

This has been committed, but you need to set myth to use alsa [1], and you need to have the pulseaudio alsa plugin installed.

1. http://www.mythtv.org/wiki/index.php/ALSA