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spa: add a macro to check for a callback version

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spa_interface_call() and friends will quietly do nothing if the version
doesn't match so we need an extra macro to know whether we can
spa_interface_call() for any given version.

This allows us to implement things like:
   if (spa_interface_callback_version_min(1)
        spa_interface_call(..., 1, func_v1)
   else
        spa_interface_call(..., 0, func_v0)
This commit is contained in:
Peter Hutterer 2021-09-14 10:29:53 +10:00 • committed by Wim Taymans
parent 6bf1f9a694
commit cbcf62f341
2 changed files with 53 additions and 0 deletions
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15
spa/include/spa/utils/hook.h
View file

@ -179,6 +179,15 @@ struct spa_interface {
_f->method((callbacks)->data, ## __VA_ARGS__); \
})
/**
* True if the \a callbacks are of version \a vers, false otherwise
*/
#define spa_callback_version_min(callbacks,type,vers) \
({ \
const type *_f = (const type *) (callbacks)->funcs; \
SPA_CALLBACK_VERSION_MIN(_f,vers); \
})
/**
* Invoke method named \a method in the \a callbacks.
* The \a method_type defines the type of the method struct.
@ -193,6 +202,12 @@ struct spa_interface {
res; \
})
/**
* True if the \a iface's \a callbacks are of version \a vers, false otherwise
*/
#define spa_interface_callback_version_min(iface,method_type,vers) \
spa_callback_version_min(&(iface)->cb, method_type, vers)
/**
* Invoke method named \a method in the callbacks on the given interface object.
* The \a method_type defines the type of the method struct, not the interface