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card: add preferred_{input, output}_port

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I will modify module-switch-on-port-available so that it will keep
track of which input and output port the user prefers on the card,
based on the user's profile and port switches. The preference needs
to be saved on disk, for which I will use module-card-restore.

To facilitate communication between the two modules, this patch adds
preferred_input_port and preferred_output_port fields to pa_card, and
a hook for monitoring the variable changes. It would be nice if the
two modules would communicate directly with each other, but
implementing that would be somewhat complicated, so I chose this time
for adding the functionality to the core. In theory some other routing
module might want to manage the new variables instead of
module-switch-on-port-available, but admittedly that's not very likely
to happen...
This commit is contained in:
Tanu Kaskinen 2016-03-04 15:23:30 +02:00 • committed by Arun Raghavan
parent b88f2859a9
commit 04040c522f
3 changed files with 59 additions and 0 deletions
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1
src/pulsecore/core.h
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@ -120,6 +120,7 @@ typedef enum pa_core_hook {
PA_CORE_HOOK_CARD_NEW,
PA_CORE_HOOK_CARD_PUT,
PA_CORE_HOOK_CARD_UNLINK,
PA_CORE_HOOK_CARD_PREFERRED_PORT_CHANGED,
PA_CORE_HOOK_CARD_PROFILE_CHANGED,
PA_CORE_HOOK_CARD_PROFILE_ADDED,
PA_CORE_HOOK_CARD_PROFILE_AVAILABLE_CHANGED,