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| author | Tilghman Lesher <tilghman@meg.abyt.es> | 2010-11-30 22:32:20 +0000 |
|---|---|---|
| committer | Tilghman Lesher <tilghman@meg.abyt.es> | 2010-11-30 22:32:20 +0000 |
| commit | e2ee76a3197169cae6c1cf2d341204c997eddbf1 (patch) | |
| tree | 703847474b71d46512bb6578a0d61c225ea9de8d /include/asterisk/frame.h | |
| parent | 72dc402f1fcdf31b83cd172d6502cbae98893195 (diff) | |
Add a comment on why the reserved bit is reserved.
Came up when reviewing discussion on the CODEC PREFS IE in IAX2.
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@296826 65c4cc65-6c06-0410-ace0-fbb531ad65f3
Diffstat (limited to 'include/asterisk/frame.h')
| -rw-r--r-- | include/asterisk/frame.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/asterisk/frame.h b/include/asterisk/frame.h index c16a3c150..b9eb75bd1 100644 --- a/include/asterisk/frame.h +++ b/include/asterisk/frame.h @@ -300,7 +300,13 @@ extern struct ast_frame ast_null_frame; #define AST_FORMAT_SPEEX16 (1ULL << 33) /*! Raw mu-law data (G.711) */ #define AST_FORMAT_TESTLAW (1ULL << 47) -/*! Reserved bit - do not use */ +/*! Reserved bit - do not use + * \warning We use this bit internally for iteration. Additionally, using this + * bit will severely break the implementation of codec prefs within IAX2, as we + * rely on the equivalence of UTF-8 and ASCII. The codec represented by this + * bit should use the first two-byte encoding of UTF-8, which is not presently + * accounted for. Hence, we reserve this bit as unused. + */ #define AST_FORMAT_RESERVED (1ULL << 63) enum ast_control_frame_type { |