A transcoder plug-in
consists of an ImageTranscoderSpi, which performs the
same functions as do the Spi classes for other plug-ins, and an
object that implements the ImageTranscoder interface:
IIOMetadata convertStreamMetadata(IIOMetadata inData,
ImageWriteParam param);
IIOMetadata convertImageMetadata(IIOMetadata inData,
ImageTypeSpecifier imageType,
ImageWriteParam param);
The
ImageTranscoder may use the standard interfaces to
unpack the incoming metadata, or it may make use of interfaces that
are specific to the actual object at hand. For example, it could
access the keywords and values instance
variables of the MyFormatMetadata class defined above;
these were made public, but not documented, precisely in order to
allow a transcoder plug-in developer to access them without having
to go through a DOM representation.
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