alsa-mixer: add required-any and required-* for enum options

Now you can add required-any to elements in a path and the path
will be valid as long as at least one of the elements are present.
Also you can have required, required-any and required-absent in
element options, causing a path to be unsupported if an option is
(not) present (simplified example: to skip line in path if
"Capture source" doesn't have a "Line In" option).

Signed-off-by: David Henningsson <david.henningsson@canonical.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/modules/alsa/alsa-mixer.h b/src/modules/alsa/alsa-mixer.h
index 7fb408a6..0fcfc0a4 100644
--- a/src/modules/alsa/alsa-mixer.h
+++ b/src/modules/alsa/alsa-mixer.h
@@ -112,6 +112,10 @@ struct pa_alsa_option {
     char *name;
     char *description;
     unsigned priority;
+
+    pa_alsa_required_t required;
+    pa_alsa_required_t required_any;
+    pa_alsa_required_t required_absent;
 };
 
 /* And element wraps one specific ALSA element. A series of elements *
@@ -129,6 +133,7 @@ struct pa_alsa_element {
     pa_alsa_enumeration_use_t enumeration_use;
 
     pa_alsa_required_t required;
+    pa_alsa_required_t required_any;
     pa_alsa_required_t required_absent;
 
     pa_bool_t override_map:1;
@@ -164,6 +169,9 @@ struct pa_alsa_path {
     pa_bool_t has_mute:1;
     pa_bool_t has_volume:1;
     pa_bool_t has_dB:1;
+    /* These two are used during probing only */
+    pa_bool_t has_req_any:1;
+    pa_bool_t req_any_present:1;
 
     long min_volume, max_volume;
     double min_dB, max_dB;