Changes between Version 3 and Version 4 of rfc24_progressive_data_support


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Timestamp:
Aug 20, 2008, 10:07:45 AM (16 years ago)
Author:
normanb
Comment:

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  • rfc24_progressive_data_support

    v3 v4  
    77== Summary ==
    88
    9 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.
     9To provide an interface for 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.
    1010
    1111== Definitions ==
    … …  
    1515== Objective ==
    1616
    17 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.
     17To 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 a raster format - e.g. png, windows bitmap.
    1818
    1919== Implementation ==
     20
     21The implementation is a definition of an interface, currently the most convenient streaming library is [http://www.kakadusoftware.com Kakadu] however since GDAL is a developer library only stubs can be distributed to conform to Kakadu licensing [http://article.gmane.org/gmane.comp.gis.gdal.devel/15955/match=fwtools+kakadu FWTools Licensing].  Commercial vendors are also interested in using GDAL for streaming support and a standard interface will allow these commercial plugins to be incorporated.
     22