[vorbis] NULLs in ov_callbacks

[Michael Smith]

At 07:07 PM 9/6/01 -0400, you wrote:
>When calling ov_open_callbacks(), is it safe to have seek_func, tell_func, and
>close_func all equal to NULL? If not, which ones must I provide and how can I
>return an error e.g., data source is not seekable?

This is all explicitly and clearly documented. Please read the docs. 
Short version: you must provide all of them. ov_seek() should return -1.

Michael

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