| 摘要 |
A host comprises a host controller configured to receive a first call for a specified attribute for closed caption from an application program; and the host controller further configured to return a predefined value to the application program or to perform exception handling in response to the first call when the specified attribute for closed caption is not supported by the host. And, the host controller is further configured to receive a second call requesting an array of available attributes for closed caption from the application program and to return the array of available attributes to the application program in response to the second call. Also, the host controller is further configured to return an array of available attributes for closed caption to the application program in response to the first call when the specified attribute for closed caption is not supported by the host.
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