[pulseaudio-discuss] [PATCH 0/3] Use a new way to get notifications for Jack and ELD changes

[David Henningsson]

On 2014-09-01 16:08, David Henningsson wrote:
> This began as an investigation of this memleak bug:
> https://bugs.freedesktop.org/show_bug.cgi?id=74213

Pushed now (no reviews, but no controversial changes). Let me know if 
it, contrary to expectation, would cause any jack detection or ELD 
troubles for you.

>
> It turned out that ALSA's snd_mixer API was using the hctl callbacks (and userdata)
> to, among other things, deallocate the data it has previously allocated.
> I couldn't just simply call the ALSA's callback from my own callback,
> because there is no API to get the current/old callback function pointer (doh!).
>
> While looking I also found a different way to accessing the mixer - by making a new
> "mixer class". This mixer class gets notifications, provided that the class creates its
> own mixer elements.
>
> Finally, with everything moved over to the "mixer class" API instead of the hctl API,
> we can remove a lot of "hctl_handle" variables all over.
>
> David Henningsson (3):
>    alsa-util: Add functions for accessing mixer elements through mixer
>      class
>    alsa-mixer/card: Move to use the new mixer interface
>    alsa: Remove unnecessary hctl handles being passed around
>
>   src/modules/alsa/alsa-mixer.c       |  14 ++---
>   src/modules/alsa/alsa-mixer.h       |   6 +-
>   src/modules/alsa/alsa-sink.c        |   6 +-
>   src/modules/alsa/alsa-source.c      |   6 +-
>   src/modules/alsa/alsa-ucm.c         |   7 +--
>   src/modules/alsa/alsa-util.c        | 111 ++++++++++++++++++++++++------------
>   src/modules/alsa/alsa-util.h        |   7 +--
>   src/modules/alsa/module-alsa-card.c |  50 ++++++++--------
>   8 files changed, 120 insertions(+), 87 deletions(-)
>

-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic