8 ORDVideo

Oracle interMedia ("interMedia") contains the following information about the ORDVideo object type:

The examples in this chapter use the ONLINE_MEDIA table in the Product Media sample schema. To replicate the examples on your own computer, you should begin with the examples shown in the reference pages for the ORDVideo constructors and the import( ) and importFrom( ) methods. Substitute video files you have for the ones shown in the examples. In addition, for a user "ron" to use the examples, the following statements must be issued before ron executes the examples, where "/mydir/work" is the directory where ron will find the video data:

CONNECT /as sysdba
CREATE OR REPLACE DIRECTORY FILE_DIR as '/mydir/work';
GRANT READ ON DIRECTORY FILE_DIR TO PUBLIC WITH GRANT OPTION;

See Oracle Database Sample Schemas for information on the sample schemas.

Note:

If you manipulate the video data itself (by either directly modifying the BLOB or changing the external source), then you must ensure that the object attributes stay synchronized and the update time is modified; otherwise, the object attributes will not match the video data.

Methods invoked at the ORDSource level that are handed off to the source plug-in for processing have ctx (RAW) as the first argument. Before calling any of these methods for the first time, the client should allocate the ctx structure, initialize it to NULL, and invoke the openSource( ) method. At this point, the source plug-in can initialize context for this client. When processing is complete, the client should invoke the closeSource( ) method.

Methods invoked from a source plug-in call have the first argument as ctx (RAW).

Methods invoked at the ORDVideo level that are handed off to the format plug-in for processing have ctx (RAW) as the first argument. Before calling any of these methods for the first time, the client should allocate the ctx structure and initialize it to NULL.

Note:

In the current release, none of the plug-ins provided by Oracle and not all source or format plug-ins will use the ctx argument, but if you code as previously described, your application should work with current or future source or format plug-ins.

You should use any of the individual set methods to set the attribute value for an object for formats not natively supported; otherwise, for formats natively supported, use the setProperties( ) method to populate the attributes of the object or write a format plug-in.