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 &func-write; call, and receive the converted data through a &func-read; call. For efficiency a driver may also support streaming I/O. [to do]