[Openal] Get source offset returns AL_INVALID_ENUM

[nic at weartronics.com]

Hi OpenAL list,

When I call alGetSourcei or alGetSourcef with any of the source offset 
parameters (i.e. AL_BYTE_OFFSET, AL_SAMPLE_OFFSET, or AL_SEC_OFFSET) the 
function is not successful and the error code AL_INVALID_ENUM is 
returned. If I use another parameter like AL_GAIN, there is no problem.

Any clue what might be causing this problem?

Kind regards,

Nic