[pulseaudio-discuss] [PATCH 3/3] alsa-ucm: Support Playback/CaptureVolume

[Felipe Tonello]

Hi Arun,

On Fri, Sep 20, 2013 at 4:57 AM, Arun Raghavan
<arun.raghavan at collabora.co.uk> wrote:
> This allows us to support the PlaybackVolume and CaptureVolume commands
> in UCM, specifying a mixer control to use for hardware volume control.
>
> This only works with ports corresponding to single devices at the
> moment, and doesn't support stacking controls for combination ports.
>
> On the UCM side, this also requires that when disabling the device for
> the port, the volume should be reset to some default.

What do you mean by that?

>
> When enabling/disabling combination devices, things are a bit iffy since
> we have no way to reset the volume before switching to a combination
> device. It would be nice to have a combination-transition-sequence
> command in UCM to handle this and other similar cases.
> ---
>  src/modules/alsa/alsa-sink.c        |  69 +++++++++++++++-----
>  src/modules/alsa/alsa-source.c      |  34 ++++++----
>  src/modules/alsa/alsa-ucm.c         | 126 ++++++++++++++++++++++++++++++++++--
>  src/modules/alsa/alsa-ucm.h         |  19 +++++-
>  src/modules/alsa/module-alsa-card.c |   4 +-
>  5 files changed, 215 insertions(+), 37 deletions(-)
>

Are the devices shared between sinks? For instance, is the
pa_alsa_path freed when the sink is freed? If that happens will cause
a problem when we change the card profile.

Regards,
Felipe Tonello