path: root/audio/out/ao_coreaudio_properties.h
diff options
authorStefano Pigozzi <>2013-07-13 13:01:50 +0200
committerStefano Pigozzi <>2013-07-22 21:53:18 +0200
commit18777ecfe894ec9c7995a69e0786e56f45bc73f8 (patch)
tree70af9d9a5ffe4960a8b1241953dcd5b08513e614 /audio/out/ao_coreaudio_properties.h
parent1ed117563613b0ddaa2a9c598acc632a707b9cc2 (diff)
ao_coreaudio: refactor properties code
Introduce some macros to deal with properties. These allow to work around the limitation of CoreAudio's API being `void **` based. The macros allow to keep their client's code DRY, by not asking size and other details which can be derived by the macro itself. I have no idea why Apple didn't design their API like this in the first place.
Diffstat (limited to 'audio/out/ao_coreaudio_properties.h')
1 files changed, 26 insertions, 17 deletions
diff --git a/audio/out/ao_coreaudio_properties.h b/audio/out/ao_coreaudio_properties.h
index 8f7cc2907b..88ba889c29 100644
--- a/audio/out/ao_coreaudio_properties.h
+++ b/audio/out/ao_coreaudio_properties.h
@@ -21,29 +21,38 @@
#include <AudioToolbox/AudioToolbox.h>
-OSStatus ca_get(AudioObjectID id, AudioObjectPropertySelector selector,
+// CoreAudio names are way too verbose
+#define ca_sel AudioObjectPropertySelector
+#define ca_scope AudioObjectPropertyScope
+#define CA_GLOBAL kAudioObjectPropertyScopeGlobal
+#define CA_OUTPUT kAudioObjectPropertyScopeOutput
+OSStatus ca_get(AudioObjectID id, ca_scope scope, ca_sel selector,
+ uint32_t size, void *data);
+OSStatus ca_set(AudioObjectID id, ca_scope scope, ca_sel selector,
uint32_t size, void *data);
-#define CA_GET(id, selector, data) ca_get(id, selector, sizeof(*(data)), data)
+#define CA_GET(id, sel, data) ca_get(id, CA_GLOBAL, sel, sizeof(*(data)), data)
+#define CA_SET(id, sel, data) ca_set(id, CA_GLOBAL, sel, sizeof(*(data)), data)
+OSStatus ca_get_ary(AudioObjectID id, ca_scope scope, ca_sel selector,
+ uint32_t element_size, void **data, size_t *elements);
+#define CA_GET_ARY(id, sel, data, elements) \
+ ca_get_ary(id, CA_GLOBAL, sel, sizeof(**(data)), (void **)data, elements)
-uint32_t GetAudioPropertyArray(AudioObjectID id,
- AudioObjectPropertySelector selector,
- AudioObjectPropertyScope scope, void **data);
+#define CA_GET_ARY_O(id, sel, data, elements) \
+ ca_get_ary(id, CA_OUTPUT, sel, sizeof(**(data)), (void **)data, elements)
-uint32_t GetGlobalAudioPropertyArray(AudioObjectID id,
- AudioObjectPropertySelector selector,
- void **data);
+OSStatus ca_get_str(AudioObjectID id, ca_scope scope,ca_sel selector,
+ char **data);
-OSStatus GetAudioPropertyString(AudioObjectID id,
- AudioObjectPropertySelector selector,
- char **data);
+#define CA_GET_STR(id, sel, data) ca_get_str(id, CA_GLOBAL, sel, data)
-OSStatus SetAudioProperty(AudioObjectID id,
- AudioObjectPropertySelector selector,
- uint32_t size, void *data);
+Boolean ca_settable(AudioObjectID id, ca_scope scope, ca_sel selector,
+ Boolean *data);
-Boolean IsAudioPropertySettable(AudioObjectID id,
- AudioObjectPropertySelector selector,
- Boolean *outData);
+#define CA_SETTABLE(id, sel, data) ca_settable(id, CA_GLOBAL, sel, data)