Escape string in src, and put the escaped string in an allocated
string in *dst, which must be freed with av_free().
@param dst pointer where an allocated string is put
@param src string to escape, must be non-NULL
@param special_chars string containing the special characters which
need to be escaped, can be NULL
@param mode escape mode to employ, see AV_ESCAPE_MODE_* macros.
Any unknown value for mode will be considered equivalent to
AV_ESCAPE_MODE_BACKSLASH, but this behaviour can change without
notice.
@param flags flags which control how to escape, see AV_ESCAPE_FLAG_ macros
@return the length of the allocated string, or a negative error code in case of error
@see av_bprint_escape()
Escape string in src, and put the escaped string in an allocated string in *dst, which must be freed with av_free().
@param dst pointer where an allocated string is put @param src string to escape, must be non-NULL @param special_chars string containing the special characters which need to be escaped, can be NULL @param mode escape mode to employ, see AV_ESCAPE_MODE_* macros. Any unknown value for mode will be considered equivalent to AV_ESCAPE_MODE_BACKSLASH, but this behaviour can change without notice. @param flags flags which control how to escape, see AV_ESCAPE_FLAG_ macros @return the length of the allocated string, or a negative error code in case of error @see av_bprint_escape()