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Add API call to determine if format capability structure is "empty".

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Empty here means that there are no formats in the format_cap structure
or the only format in it is the "none" format.

I've added calls to check the emptiness of a format_cap in a few places
in order to short-circuit operations that would otherwise be pointless
as well as to prevent some assertions from being triggered in cases
where channels with no formats are used.



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@423414 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Michelson
2014-09-18 16:37:47 +00:00
parent 5c5aee4458
commit 23a375be5f
4 changed files with 34 additions and 0 deletions
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9
include/asterisk/format_cap.h
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@@ -321,4 +321,13 @@ int ast_format_cap_has_type(const struct ast_format_cap *cap, enum ast_media_typ
*/
const char *ast_format_cap_get_names(struct ast_format_cap *cap, struct ast_str **buf);
/*!
* \brief Determine if a format cap has no formats in it.
*
* \param cap The format cap to check for emptiness
* \retval 1 The format cap has zero formats or only ast_format_none
* \retval 0 The format cap has at least one format
*/
int ast_format_cap_empty(struct ast_format_cap *cap);
#endif /* _AST_FORMAT_CAP_H */