Video for Linux Two API Specification: Revision 0.24
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# 4.5. Codec Interface

> Suspended: This interface has been be suspended from the V4L2 API implemented in Linux 2.6 until we have more experience with codec device interfaces.

A V4L2 codec can compress, decompress, transform, or otherwise convert video data from one format into another format, in memory. Applications send data to be converted to the driver through a `write()` call, and receive the converted data through a `read()` call. For efficiency a driver may also support streaming I/O.

[to do]

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