RFC 24: GDAL Progressive Data Support

Author: Norman Barker
Contact: nbarker@…
Status: Development

Summary

To provide data streaming support to GDAL by overloading the RasterIO function to include a callback function when there are buffer updates. The RFC focuses on JPIP but should be generic to apply to other streaming / progressive formats.

Definitions

JPIP: JPEG 2000 Interactive Protocol

Objective

To provide a callback function to allow users of a progressive format driver to receive notifications of updates to the underlying dataset for a particular requested region of the data. The notification mechanism should be accessible to all the swig wrappers and the underlying buffer data should be conveniently stored to allow conversion to raster format - e.g. png, windows bitmap.

Implementation