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Add a comment on why the reserved bit is reserved.

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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
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Tilghman Lesher
2010-11-30 22:32:20 +00:00
parent 72dc402f1f
commit e2ee76a319
1 changed files with 7 additions and 1 deletions
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8
include/asterisk/frame.h
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@@ -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 {