[alsa-devel] [PATCH 0/3] alsa-lib: UCM - Use Case Manager

[Raymond Yau]

2010/8/24 Liam Girdwood <lrg at slimlogic.co.uk>

> This patch series follows on from the RFC and adds sound card hardware Use
> Case
> Management support to alsa-lib.
>
> The main features of UCM are :-
>
>  o Abstraction of sound card hardware routing and controls into high level
>   use case verbs, devices and modifiers.
>  o Discovery of source/sink PCMs for each use case.
>  o Discovery of hardware master volume controls for each use case.
>
> It's intended UCM will provide clients (like pulseaudio) complete control
> over
> hardware signal routing within a sound card without any knowledge of the
> sound card hardware.
>
> Use case definintions are stored in text files (per sound card) and are now
> divided into three components as descibed in the RFC.
>
> A working use case definition file can be found here :-
>
>
> http://git.slimlogic.co.uk/cgi-bin/cgit.cgi/alsa-ucm-conf.git/tree/cards/SDP4430/hifi
>
> The three components of a use case are now :-
>
> 1) Verb (or action). This is mandatory and describes (in terms of ALSA
> control settings) the system use case action. e.g "Phone Call", "Music
> Playback".
>
> 2) Device. This is also mandatory and describes the audio playback or
> capture device. e.g. "Handset", "Bluetooth", "Headset".
>
> 3) Modifier. This is optional and is used to modify the current use case
> verb. i.e. The user could be listening to music when an incoming phone
> call requires that a ring tone is played. In this case the use case verb
> would be set to "Music Playback" when the music playback started and
> then the "Tone Playback" modifier could be enabled to play the ring
> tone. The use case verb would then be changed to "Voice Call" if the
> call was accepted.
>
> Patch 2/3 is a little on the large side so, I've included a link if it gets
> bounced by the list.
>
>
> http://git.slimlogic.co.uk/cgi-bin/cgit.cgi/alsa-lib.git/commit/?h=ucm-upstream&id=15d5f619deba20f87075e7c711e6331115fd836d
>
> Liam Girdwood (3):
>  ucm: header - ALSA Use Case Manager
>  ucm: core - Add initial Use Case Manager support.
>  ucm: build - add build support for Use Case Manager
>
>  doc/doxygen.cfg.in  |    1 +
>  include/Makefile.am |    2 +-
>  include/use-case.h  |  427 +++++++
>  src/Makefile.am     |    2 +-
>  src/use-case.c      | 3515
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 3945 insertions(+), 2 deletions(-)
>  create mode 100644 include/use-case.h
>  create mode 100644 src/use-case.c
>

Can the use case manager discover whether the green/pink jack in front panel
can be used independent of  those audio jacks in rear panel for HDA-Intel in
desktop pc ?

How about those hardware mixing sound card ?
e.g. emu10k1 allow the user to output stereo to the selected  jacks (front ,
rear, .... )