Examples of HeaderEncoder

jj2000.j2k.codestream.writer.HeaderEncoder

This class writes almost of the markers and marker segments in main header and in tile-part headers. It is created by the run() method of the Encoder instance.

A marker segment includes a marker and eventually marker segment parameters. It is designed by the three letter code of the marker associated with the marker segment. JPEG 2000 part I defines 6 types of markers:

Delimiting : SOC,SOT,SOD,EOC (written in FileCodestreamWriter).
Fixed information: SIZ.
Functional: COD,COC,RGN,QCD,QCC,POC.
In bit-stream: SOP,EPH.
Pointer: TLM,PLM,PLT,PPM,PPT.
Informational: CRG,COM.

Main Header is written when Encoder instance calls encodeMainHeader whereas tile-part headers are written when the EBCOTRateAllocator instance calls encodeTilePartHeader. @see Encoder @see Markers @see EBCOTRateAllocator

                                                 rate,
                                                 bwriter,
                                                 j2kwparam);


        // Instantiates the HeaderEncoder
        HeaderEncoder headenc =
            new HeaderEncoder(imgsrc, imsigned, dwt, imgtiler,
                              j2kwparam, rois,ralloc);


        ralloc.setHeaderEncoder(headenc);


        // Writes header to be able to estimate header overhead
        headenc.encodeMainHeader();


        //Initializes rate allocator, with proper header
        // overhead. This will also encode all the data
        try {
            ralloc.initialize();
        } catch (RuntimeException e) {
            if (WRITE_ABORTED.equals(e.getMessage())) {
                bwriter.close();
                tmpFile.delete();
                processWriteAborted();
                return;
            } else throw e;
        }


        // Write header (final)
        headenc.reset();
        headenc.encodeMainHeader();


        // Insert header into the codestream
        bwriter.commitBitstreamHeader(headenc);


        // Now do the rate-allocation and write result

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.

Examples of HeaderEncoder

Examples of jj2000.j2k.codestream.writer.HeaderEncoder