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-rw-r--r--include/asterisk/frame.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/asterisk/frame.h b/include/asterisk/frame.h
index 645e4071d..5ded71fa8 100644
--- a/include/asterisk/frame.h
+++ b/include/asterisk/frame.h
@@ -556,7 +556,15 @@ void ast_parse_allow_disallow(struct ast_codec_pref *pref, int *mask, const char
/*! \brief Dump audio codec preference list into a string */
int ast_codec_pref_string(struct ast_codec_pref *pref, char *buf, size_t size);
-/*! \brief Shift an audio codec preference list up or down 65 bytes so that it becomes an ASCII string */
+/*! \brief Shift an audio codec preference list up or down 65 bytes so that it becomes an ASCII string
+ * \note Due to a misunderstanding in how codec preferences are stored, this
+ * list starts at 'B', not 'A'. For backwards compatibility reasons, this
+ * cannot change.
+ * \param pref A codec preference list structure
+ * \param buf A string denoting codec preference, appropriate for use in line transmission
+ * \param size Size of \a buf
+ * \param right Boolean: if 0, convert from \a buf to \a pref; if 1, convert from \a pref to \a buf.
+ */
void ast_codec_pref_convert(struct ast_codec_pref *pref, char *buf, size_t size, int right);
/*! \brief Returns the number of samples contained in the frame */