libremetaverse/CSJ2K/j2k/entropy/encoder/EBCOTRateAllocator.cs

/*
* CVS identifier:
*
* $Id: EBCOTRateAllocator.java,v 1.97 2002/05/22 14:59:44 grosbois Exp $
*
* Class:                   EBCOTRateAllocator
*
* Description:             Generic interface for post-compression
*                          rate allocator.
*
*
*
* COPYRIGHT:
* 
* This software module was originally developed by Raphaël Grosbois and
* Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
* Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
* Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
* Centre France S.A) in the course of development of the JPEG2000
* standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
* software module is an implementation of a part of the JPEG 2000
* Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
* Systems AB and Canon Research Centre France S.A (collectively JJ2000
* Partners) agree not to assert against ISO/IEC and users of the JPEG
* 2000 Standard (Users) any of their rights under the copyright, not
* including other intellectual property rights, for this software module
* with respect to the usage by ISO/IEC and Users of this software module
* or modifications thereof for use in hardware or software products
* claiming conformance to the JPEG 2000 Standard. Those intending to use
* this software module in hardware or software products are advised that
* their use may infringe existing patents. The original developers of
* this software module, JJ2000 Partners and ISO/IEC assume no liability
* for use of this software module or modifications thereof. No license
* or right to this software module is granted for non JPEG 2000 Standard
* conforming products. JJ2000 Partners have full right to use this
* software module for his/her own purpose, assign or donate this
* software module to any third party and to inhibit third parties from
* using this software module for non JPEG 2000 Standard conforming
* products. This copyright notice must be included in all copies or
* derivative works of this software module.
* 
* Copyright (c) 1999/2000 JJ2000 Partners.
* */
using System;
using CSJ2K.j2k.codestream.writer;
using CSJ2K.j2k.wavelet.analysis;
using CSJ2K.j2k.entropy.encoder;
using CSJ2K.j2k.codestream;
using CSJ2K.j2k.entropy;
using CSJ2K.j2k.encoder;
using CSJ2K.j2k.image;
using CSJ2K.j2k.util;
namespace CSJ2K.j2k.entropy.encoder
{
	
	/// <summary> This implements the EBCOT post compression rate allocation algorithm. This
	/// algorithm finds the most suitable truncation points for the set of
	/// code-blocks, for each layer target bitrate. It works by first collecting
	/// the rate distortion info from all code-blocks, in all tiles and all
	/// components, and then running the rate-allocation on the whole image at
	/// once, for each layer.
	/// 
	/// <p>This implementation also provides some timing features. They can be
	/// enabled by setting the 'DO_TIMING' constant of this class to true and
	/// recompiling. The timing uses the 'System.currentTimeMillis()' Java API
	/// call, which returns wall clock time, not the actual CPU time used. The
	/// timing results will be printed on the message output. Since the times
	/// reported are wall clock times and not CPU usage times they can not be added
	/// to find the total used time (i.e. some time might be counted in several
	/// places). When timing is disabled ('DO_TIMING' is false) there is no penalty
	/// if the compiler performs some basic optimizations. Even if not the penalty
	/// should be negligeable.</p>
	/// 
	/// </summary>
	/// <seealso cref="PostCompRateAllocator">
	/// </seealso>
	/// <seealso cref="CodedCBlkDataSrcEnc">
	/// </seealso>
	/// <seealso cref="jj2000.j2k.codestream.writer.CodestreamWriter">
	/// 
	/// </seealso>
	public class EBCOTRateAllocator:PostCompRateAllocator
	{
		
		/// <summary>Whether to collect timing information or not: false. Used as a compile
		/// time directive. 
		/// </summary>

#if DO_TIMING
		/// <summary>The wall time for the initialization. </summary>
		//private long initTime;
		
		/// <summary>The wall time for the building of layers. </summary>
		//private long buildTime;
		
		/// <summary>The wall time for the writing of layers. </summary>
		//private long writeTime;
#endif

		/// <summary> 5D Array containing all the coded code-blocks:
		/// 
		/// <ul>
		/// <li>1st index: tile index</li>
		/// <li>2nd index: component index</li>
		/// <li>3rd index: resolution level index</li>
		/// <li>4th index: subband index</li>
		/// <li>5th index: code-block index</li>
		/// </ul>
		/// 
		/// </summary>
		private CBlkRateDistStats[][][][][] cblks;
		
		/// <summary> 6D Array containing the indices of the truncation points. It actually
		/// contains the index of the element in CBlkRateDistStats.truncIdxs that
		/// gives the real truncation point index.
		/// 
		/// <ul>
		/// <li>1st index: tile index</li>
		/// <li>2nd index: layer index</li>
		/// <li>3rd index: component index</li>
		/// <li>4th index: resolution level index</li>
		/// <li>5th index: subband index</li>
		/// <li>6th index: code-block index</li>
		/// </ul>
		/// 
		/// </summary>
		private int[][][][][][] truncIdxs;
		
		/// <summary> Number of precincts in each resolution level:
		/// 
		/// <ul>
		/// <li>1st dim: tile index.</li>
		/// <li>2nd dim: component index.</li>
		/// <li>3nd dim: resolution level index.</li>
		/// </ul>
		/// 
		/// </summary>
		private Coord[][][] numPrec;
		
		/// <summary>Array containing the layers information. </summary>
		private EBCOTLayer[] layers;
		
		/// <summary>The log of 2, natural base </summary>
		//UPGRADE_NOTE: Final was removed from the declaration of 'LOG2 '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
		private static readonly double LOG2 = System.Math.Log(2);
		
		/// <summary>The normalization offset for the R-D summary table </summary>
		private const int RD_SUMMARY_OFF = 24;
		
		/// <summary>The size of the summary table </summary>
		private const int RD_SUMMARY_SIZE = 64;
		
		/// <summary>The relative precision for float data. This is the relative tolerance
		/// up to which the layer slope thresholds are calculated. 
		/// </summary>
		private const float FLOAT_REL_PRECISION = 1e-4f;
		
		/// <summary>The precision for float data type, in an absolute sense. Two float
		/// numbers are considered "equal" if they are within this precision. 
		/// </summary>
		private const float FLOAT_ABS_PRECISION = 1e-10f;
		
		/// <summary>Minimum average size of a packet. If layer has less bytes than the
		/// this constant multiplied by number of packets in the layer, then the
		/// layer is skipped. 
		/// </summary>
		private const int MIN_AVG_PACKET_SZ = 32;
		
		/// <summary>The R-D summary information collected from the coding of all
		/// code-blocks. For each entry it contains the accumulated length of all
		/// truncation points that have a slope not less than
		/// '2*(k-RD_SUMMARY_OFF)', where 'k' is the entry index.
		/// 
		/// <p>Therefore, the length at entry 'k' is the total number of bytes of
		/// code-block data that would be obtained if the truncation slope was
		/// chosen as '2*(k-RD_SUMMARY_OFF)', without counting the overhead
		/// associated with the packet heads.</p>
		/// 
		/// <p>This summary is used to estimate the relation of the R-D slope to
		/// coded length, and to obtain absolute minimums on the slope given a
		/// length. </p> 
		/// </summary>
		private int[] RDSlopesRates;
		
		/// <summary>Packet encoder. </summary>
		private PktEncoder pktEnc;
		
		/// <summary>The layer specifications </summary>
		private LayersInfo lyrSpec;
		
		/// <summary>The maximum slope accross all code-blocks and truncation points. </summary>
		private float maxSlope;
		
		/// <summary>The minimum slope accross all code-blocks and truncation points. </summary>
		private float minSlope;
		
		/// <summary> Initializes the EBCOT rate allocator of entropy coded data. The layout
		/// of layers, and their bitrate constraints, is specified by the 'lyrs'
		/// parameter.
		/// 
		/// </summary>
		/// <param name="src">The source of entropy coded data.
		/// 
		/// </param>
		/// <param name="lyrs">The layers layout specification.
		/// 
		/// </param>
		/// <param name="writer">The bit stream writer.
		/// 
		/// </param>
		/// <seealso cref="ProgressionType">
		/// 
		/// </seealso>
		public EBCOTRateAllocator(CodedCBlkDataSrcEnc src, LayersInfo lyrs, CodestreamWriter writer, EncoderSpecs encSpec, ParameterList pl):base(src, lyrs.TotNumLayers, writer, encSpec)
		{
			
			int minsbi, maxsbi;
			int i;
			SubbandAn sb, sb2;
			Coord ncblks = null;
			
			// If we do timing create necessary structures
#if DO_TIMING
			// If we are timing make sure that 'finalize' gets called.
			//UPGRADE_ISSUE: Method 'java.lang.System.runFinalizersOnExit' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javalangSystem'"
			// CONVERSION PROBLEM?
            //System_Renamed.runFinalizersOnExit(true);
			// The System.runFinalizersOnExit() method is deprecated in Java
			// 1.2 since it can cause a deadlock in some cases. However, here
			// we use it only for profiling purposes and is disabled in
			// production code.
			initTime = 0L;
			buildTime = 0L;
			writeTime = 0L;
#endif
			
			// Save the layer specs
			lyrSpec = lyrs;
			
			//Initialize the size of the RD slope rates array
			RDSlopesRates = new int[RD_SUMMARY_SIZE];
			
			//Get number of tiles, components
			int nt = src.getNumTiles();
			int nc = NumComps;
			
			//Allocate the coded code-blocks and truncation points indexes arrays
			cblks = new CBlkRateDistStats[nt][][][][];
			for (int i2 = 0; i2 < nt; i2++)
			{
				cblks[i2] = new CBlkRateDistStats[nc][][][];
			}
			truncIdxs = new int[nt][][][][][];
			for (int i3 = 0; i3 < nt; i3++)
			{
				truncIdxs[i3] = new int[num_Layers][][][][];
				for (int i4 = 0; i4 < num_Layers; i4++)
				{
					truncIdxs[i3][i4] = new int[nc][][][];
				}
			}
			
			int cblkPerSubband; // Number of code-blocks per subband
			int mrl; // Number of resolution levels
			int l; // layer index
			int s; //subband index
			
			// Used to compute the maximum number of precincts for each resolution
			// level
			int tx0, ty0, tx1, ty1; // Current tile position in the reference grid
			int tcx0, tcy0, tcx1, tcy1; // Current tile position in the domain of
			// the image component
			int trx0, try0, trx1, try1; // Current tile position in the reduced
			// resolution image domain
			int xrsiz, yrsiz; // Component sub-sampling factors
			Coord tileI = null;
			Coord nTiles = null;
			int xsiz, ysiz, x0siz, y0siz;
			int xt0siz, yt0siz;
			int xtsiz, ytsiz;
			
			int cb0x = src.CbULX;
			int cb0y = src.CbULY;
			
			src.setTile(0, 0);
			for (int t = 0; t < nt; t++)
			{
				// Loop on tiles
				nTiles = src.getNumTiles(nTiles);
				tileI = src.getTile(tileI);
				x0siz = ImgULX;
				y0siz = ImgULY;
				xsiz = x0siz + ImgWidth;
				ysiz = y0siz + ImgHeight;
				xt0siz = src.TilePartULX;
				yt0siz = src.TilePartULY;
				xtsiz = src.NomTileWidth;
				ytsiz = src.NomTileHeight;
				
				// Tile's coordinates on the reference grid
				tx0 = (tileI.x == 0)?x0siz:xt0siz + tileI.x * xtsiz;
				ty0 = (tileI.y == 0)?y0siz:yt0siz + tileI.y * ytsiz;
				tx1 = (tileI.x != nTiles.x - 1)?xt0siz + (tileI.x + 1) * xtsiz:xsiz;
				ty1 = (tileI.y != nTiles.y - 1)?yt0siz + (tileI.y + 1) * ytsiz:ysiz;
				
				for (int c = 0; c < nc; c++)
				{
					// loop on components
					
					//Get the number of resolution levels
					sb = src.getAnSubbandTree(t, c);
					mrl = sb.resLvl + 1;
					
					// Initialize maximum number of precincts per resolution array
					if (numPrec == null)
					{
						Coord[][][] tmpArray = new Coord[nt][][];
						for (int i5 = 0; i5 < nt; i5++)
						{
							tmpArray[i5] = new Coord[nc][];
						}
						numPrec = tmpArray;
					}
					if (numPrec[t][c] == null)
					{
						numPrec[t][c] = new Coord[mrl];
					}
					
					// Subsampling factors
					xrsiz = src.getCompSubsX(c);
					yrsiz = src.getCompSubsY(c);
					
					// Tile's coordinates in the image component domain
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					tcx0 = (int) System.Math.Ceiling(tx0 / (double) (xrsiz));
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					tcy0 = (int) System.Math.Ceiling(ty0 / (double) (yrsiz));
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					tcx1 = (int) System.Math.Ceiling(tx1 / (double) (xrsiz));
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					tcy1 = (int) System.Math.Ceiling(ty1 / (double) (yrsiz));
					
					cblks[t][c] = new CBlkRateDistStats[mrl][][];
					
					for (l = 0; l < num_Layers; l++)
					{
						truncIdxs[t][l][c] = new int[mrl][][];
					}
					
					for (int r = 0; r < mrl; r++)
					{
						// loop on resolution levels
						
						// Tile's coordinates in the reduced resolution image
						// domain
						//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
						trx0 = (int) System.Math.Ceiling(tcx0 / (double) (1 << (mrl - 1 - r)));
						//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
						try0 = (int) System.Math.Ceiling(tcy0 / (double) (1 << (mrl - 1 - r)));
						//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
						trx1 = (int) System.Math.Ceiling(tcx1 / (double) (1 << (mrl - 1 - r)));
						//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
						try1 = (int) System.Math.Ceiling(tcy1 / (double) (1 << (mrl - 1 - r)));
						
						// Calculate the maximum number of precincts for each
						// resolution level taking into account tile specific
						// options.
						double twoppx = (double) encSpec.pss.getPPX(t, c, r);
						double twoppy = (double) encSpec.pss.getPPY(t, c, r);
						numPrec[t][c][r] = new Coord();
						if (trx1 > trx0)
						{
							//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
							numPrec[t][c][r].x = (int) System.Math.Ceiling((trx1 - cb0x) / twoppx) - (int) System.Math.Floor((trx0 - cb0x) / twoppx);
						}
						else
						{
							numPrec[t][c][r].x = 0;
						}
						if (try1 > try0)
						{
							//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
							numPrec[t][c][r].y = (int) System.Math.Ceiling((try1 - cb0y) / twoppy) - (int) System.Math.Floor((try0 - cb0y) / (double) twoppy);
						}
						else
						{
							numPrec[t][c][r].y = 0;
						}
						
						minsbi = (r == 0)?0:1;
						maxsbi = (r == 0)?1:4;
						
						cblks[t][c][r] = new CBlkRateDistStats[maxsbi][];
						for (l = 0; l < num_Layers; l++)
						{
							truncIdxs[t][l][c][r] = new int[maxsbi][];
						}
						
						for (s = minsbi; s < maxsbi; s++)
						{
							// loop on subbands
							//Get the number of blocks in the current subband
							sb2 = (SubbandAn) sb.getSubbandByIdx(r, s);
							ncblks = sb2.numCb;
							cblkPerSubband = ncblks.x * ncblks.y;
							cblks[t][c][r][s] = new CBlkRateDistStats[cblkPerSubband];
							
							for (l = 0; l < num_Layers; l++)
							{
								truncIdxs[t][l][c][r][s] = new int[cblkPerSubband];
								for (i = 0; i < cblkPerSubband; i++)
								{
									truncIdxs[t][l][c][r][s][i] = - 1;
								}
							}
						} // End loop on subbands
					} // End lopp on resolution levels
				} // End loop on components
				if (t != nt - 1)
				{
					src.nextTile();
				}
			} // End loop on tiles
			
			//Initialize the packet encoder
			pktEnc = new PktEncoder(src, encSpec, numPrec, pl);
			
			// The layers array has to be initialized after the constructor since
			// it is needed that the bit stream header has been entirely written
		}
		
#if DO_TIMING
		/// <summary> Prints the timing information, if collected, and calls 'finalize' on
		/// the super class.
		/// 
		/// </summary>
        ~EBCOTRateAllocator()
        {

            System.Text.StringBuilder sb;

            sb = new System.Text.StringBuilder("EBCOTRateAllocator wall clock times:\n");
            sb.Append("  initialization: ");
            sb.Append(initTime);
            sb.Append(" ms\n");
            sb.Append("  layer building: ");
            sb.Append(buildTime);
            sb.Append(" ms\n");
            sb.Append("  final writing:  ");
            sb.Append(writeTime);
            sb.Append(" ms");
            FacilityManager.getMsgLogger().printmsg(CSJ2K.j2k.util.MsgLogger_Fields.INFO, sb.ToString());
            //UPGRADE_NOTE: Call to 'super.finalize()' was removed. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1124'"
        }
#endif
		/// <summary> Runs the rate allocation algorithm and writes the data to the bit
		/// stream writer object provided to the constructor.
		/// 
		/// </summary>
		public override void  runAndWrite()
		{
			//Now, run the rate allocation
			buildAndWriteLayers();
		}
		
		/// <summary> Initializes the layers array. This must be called after the main header
		/// has been entirely written or simulated, so as to take its overhead into
		/// account. This method will get all the code-blocks and then initialize
		/// the target bitrates for each layer, according to the specifications.
		/// 
		/// </summary>
		public override void  initialize()
		{
			int n, i, l;
			int ho; // The header overhead (in bytes)
			float np; // The number of pixels divided by the number of bits per byte
			double ls; // Step for log-scale
			double basebytes;
			int lastbytes, newbytes, nextbytes;
			int loopnlyrs;
			int minlsz; // The minimum allowable number of bytes in a layer
			int totenclength;
			int maxpkt;
			int numTiles = src.getNumTiles();
			int numComps = src.NumComps;
			int numLvls;
			int avgPktLen;
#if DO_TIMING
			long stime = 0L;
#endif
			// Start by getting all the code-blocks, we need this in order to have 
			// an idea of the total encoded bitrate.
			getAllCodeBlocks();
			
#if DO_TIMING
				stime = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
#endif

			// Now get the total encoded length
			totenclength = RDSlopesRates[0]; // all the encoded data
			// Make a rough estimation of the packet head overhead, as 2 bytes per
			// packet in average (plus EPH / SOP) , and add that to the total
			// encoded length
			for (int t = 0; t < numTiles; t++)
			{
				avgPktLen = 2;
				// Add SOP length if set
				if (((System.String) encSpec.sops.getTileDef(t)).ToUpper().Equals("on".ToUpper()))
				{
					avgPktLen += CSJ2K.j2k.codestream.Markers.SOP_LENGTH;
				}
				// Add EPH length if set
				if (((System.String) encSpec.ephs.getTileDef(t)).ToUpper().Equals("on".ToUpper()))
				{
					avgPktLen += CSJ2K.j2k.codestream.Markers.EPH_LENGTH;
				}
				
				for (int c = 0; c < numComps; c++)
				{
					numLvls = src.getAnSubbandTree(t, c).resLvl + 1;
					if (!src.precinctPartitionUsed(c, t))
					{
						// Precinct partition is not used so there is only
						// one packet per resolution level/layer
						totenclength += num_Layers * avgPktLen * numLvls;
					}
					else
					{
						// Precinct partition is used so for each
						// component/tile/resolution level, we get the maximum
						// number of packets
						for (int rl = 0; rl < numLvls; rl++)
						{
							maxpkt = numPrec[t][c][rl].x * numPrec[t][c][rl].y;
							totenclength += num_Layers * avgPktLen * maxpkt;
						}
					}
				} // End loop on components
			} // End loop on tiles
			
			// If any layer specifies more than 'totenclength' as its target
			// length then 'totenclength' is used. This is to prevent that
			// estimated layers get excessively large target lengths due to an
			// excessively large target bitrate. At the end the last layer is set
			// to the target length corresponding to the overall target
			// bitrate. Thus, 'totenclength' can not limit the total amount of
			// encoded data, as intended.
			
			ho = headEnc.Length;
			np = src.ImgWidth * src.ImgHeight / 8f;
			
			// SOT marker must be taken into account
			for (int t = 0; t < numTiles; t++)
			{
				headEnc.reset();
				headEnc.encodeTilePartHeader(0, t);
				ho += headEnc.Length;
			}
			
			layers = new EBCOTLayer[num_Layers];
			for (n = num_Layers - 1; n >= 0; n--)
			{
				layers[n] = new EBCOTLayer();
			}
			
			minlsz = 0; // To keep compiler happy
			for (int t = 0; t < numTiles; t++)
			{
				for (int c = 0; c < numComps; c++)
				{
					numLvls = src.getAnSubbandTree(t, c).resLvl + 1;
					
					if (!src.precinctPartitionUsed(c, t))
					{
						// Precinct partition is not used
						minlsz += MIN_AVG_PACKET_SZ * numLvls;
					}
					else
					{
						// Precinct partition is used
						for (int rl = 0; rl < numLvls; rl++)
						{
							maxpkt = numPrec[t][c][rl].x * numPrec[t][c][rl].y;
							minlsz += MIN_AVG_PACKET_SZ * maxpkt;
						}
					}
				} // End loop on components
			} // End loop on tiles
			
			// Initialize layers
			n = 0;
			i = 0;
			lastbytes = 0;
			
			while (n < num_Layers - 1)
			{
				// At an optimized layer
				basebytes = System.Math.Floor(lyrSpec.getTargetBitrate(i) * np);
				if (i < lyrSpec.NOptPoints - 1)
				{
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					nextbytes = (int) (lyrSpec.getTargetBitrate(i + 1) * np);
					// Limit target length to 'totenclength'
					if (nextbytes > totenclength)
						nextbytes = totenclength;
				}
				else
				{
					nextbytes = 1;
				}
				loopnlyrs = lyrSpec.getExtraLayers(i) + 1;
				ls = System.Math.Exp(System.Math.Log((double) nextbytes / basebytes) / loopnlyrs);
				layers[n].optimize = true;
				for (l = 0; l < loopnlyrs; l++)
				{
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					newbytes = (int) basebytes - lastbytes - ho;
					if (newbytes < minlsz)
					{
						// Skip layer (too small)
						basebytes *= ls;
						num_Layers--;
						continue;
					}
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					lastbytes = (int) basebytes - ho;
					layers[n].maxBytes = lastbytes;
					basebytes *= ls;
					n++;
				}
				i++; // Goto next optimization point
			}
			
			// Ensure minimum size of last layer (this one determines overall
			// bitrate)
			n = num_Layers - 2;
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			nextbytes = (int) (lyrSpec.TotBitrate * np) - ho;
			newbytes = nextbytes - ((n >= 0)?layers[n].maxBytes:0);
			while (newbytes < minlsz)
			{
				if (num_Layers == 1)
				{
					if (newbytes <= 0)
					{
						throw new System.ArgumentException("Overall target bitrate too " + "low, given the current " + "bit stream header overhead");
					}
					break;
				}
				// Delete last layer
				num_Layers--;
				n--;
				newbytes = nextbytes - ((n >= 0)?layers[n].maxBytes:0);
			}
			// Set last layer to the overall target bitrate
			n++;
			layers[n].maxBytes = nextbytes;
			layers[n].optimize = true;
			
			// Re-initialize progression order changes if needed Default values
            Progression[] prog1; // prog2 removed
			prog1 = (Progression[]) encSpec.pocs.getDefault();
			int nValidProg = prog1.Length;
			for (int prg = 0; prg < prog1.Length; prg++)
			{
				if (prog1[prg].lye > num_Layers)
				{
					prog1[prg].lye = num_Layers;
				}
			}
			if (nValidProg == 0)
			{
				throw new System.InvalidOperationException("Unable to initialize rate allocator: No " + "default progression type has been defined.");
			}
			
			// Tile specific values
			for (int t = 0; t < numTiles; t++)
			{
				if (encSpec.pocs.isTileSpecified(t))
				{
					prog1 = (Progression[]) encSpec.pocs.getTileDef(t);
					nValidProg = prog1.Length;
					for (int prg = 0; prg < prog1.Length; prg++)
					{
						if (prog1[prg].lye > num_Layers)
						{
							prog1[prg].lye = num_Layers;
						}
					}
					if (nValidProg == 0)
					{
						throw new System.InvalidOperationException("Unable to initialize rate allocator:" + " No default progression type has been " + "defined for tile " + t);
					}
				}
			} // End loop on tiles
			
#if DO_TIMING
			initTime += (System.DateTime.Now.Ticks - 621355968000000000) / 10000 - stime;
#endif
		}
		
		/// <summary> This method gets all the coded code-blocks from the EBCOT entropy coder
		/// for every component and every tile. Each coded code-block is stored in
		/// a 5D array according to the component, the resolution level, the tile,
		/// the subband it belongs and its position in the subband.
		/// 
		/// <P> For each code-block, the valid slopes are computed and converted
		/// into the mantissa-exponent representation.
		/// 
		/// </summary>
		private void  getAllCodeBlocks()
		{
			
			int numComps, numTiles; // numBytes removed
			int c, r, t, s, sidx, k;
			//int slope;
			SubbandAn subb;
			CBlkRateDistStats ccb = null;
			Coord ncblks = null;
			int last_sidx;
			float fslope;
#if DO_TIMING
			long stime = 0L;
#endif
			maxSlope = 0f;
			minSlope = System.Single.MaxValue;
			
			//Get the number of components and tiles
			numComps = src.NumComps;
			numTiles = src.getNumTiles();
			
			SubbandAn root, sb;
			int cblkToEncode = 0;
			
			//Get all coded code-blocks Goto first tile
			src.setTile(0, 0);
			for (t = 0; t < numTiles; t++)
			{
				//loop on tiles
				cblkToEncode = 0;
				for (c = 0; c < numComps; c++)
				{
					root = src.getAnSubbandTree(t, c);
					for (r = 0; r <= root.resLvl; r++)
					{
						if (r == 0)
						{
							sb = (SubbandAn) root.getSubbandByIdx(0, 0);
							if (sb != null)
								cblkToEncode += sb.numCb.x * sb.numCb.y;
						}
						else
						{
							sb = (SubbandAn) root.getSubbandByIdx(r, 1);
							if (sb != null)
								cblkToEncode += sb.numCb.x * sb.numCb.y;
							sb = (SubbandAn) root.getSubbandByIdx(r, 2);
							if (sb != null)
								cblkToEncode += sb.numCb.x * sb.numCb.y;
							sb = (SubbandAn) root.getSubbandByIdx(r, 3);
							if (sb != null)
								cblkToEncode += sb.numCb.x * sb.numCb.y;
						}
					}
				}
				
				for (c = 0; c < numComps; c++)
				{
					//loop on components
					
					//Get next coded code-block coordinates
					while ((ccb = src.getNextCodeBlock(c, ccb)) != null)
					{
#if DO_TIMING
						stime = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
#endif
												
						subb = ccb.sb;
						
						//Get the coded code-block resolution level index
						r = subb.resLvl;
						
						//Get the coded code-block subband index
						s = subb.sbandIdx;
						
						//Get the number of blocks in the current subband
						ncblks = subb.numCb;
						
						// Add code-block contribution to summary R-D table
						// RDSlopesRates
						last_sidx = - 1;
						for (k = ccb.nVldTrunc - 1; k >= 0; k--)
						{
							fslope = ccb.truncSlopes[k];
							if (fslope > maxSlope)
								maxSlope = fslope;
							if (fslope < minSlope)
								minSlope = fslope;
							sidx = getLimitedSIndexFromSlope(fslope);
							for (; sidx > last_sidx; sidx--)
							{
								RDSlopesRates[sidx] += ccb.truncRates[ccb.truncIdxs[k]];
							}
							last_sidx = getLimitedSIndexFromSlope(fslope);
						}
						
						//Fills code-blocks array
						cblks[t][c][r][s][(ccb.m * ncblks.x) + ccb.n] = ccb;
						ccb = null;
						
#if DO_TIMING
						initTime += (System.DateTime.Now.Ticks - 621355968000000000) / 10000 - stime;
#endif
					}
				}
				
				//Goto next tile
				if (t < numTiles - 1)
				//not at last tile
					src.nextTile();
			}
		}
		
		/// <summary> This method builds all the bit stream layers and then writes them to
		/// the output bit stream. Firstly it builds all the layers by computing
		/// the threshold according to the layer target bit-rate, and then it
		/// writes the layer bit streams according to the progressive type.
		/// 
		/// </summary>
		private void  buildAndWriteLayers()
		{
			int nPrec = 0;
			int maxBytes, actualBytes;
			float rdThreshold;
			SubbandAn sb;
			//float threshold;
			BitOutputBuffer hBuff = null;
			byte[] bBuff = null;
			int[] tileLengths; // Length of each tile
			int tmp;
			bool sopUsed; // Should SOP markers be used ?
			bool ephUsed; // Should EPH markers be used ?
			int nc = src.NumComps;
			int nt = src.getNumTiles();
			int mrl;
#if DO_TIMING			
			long stime = 0L;
			stime = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
#endif
			
			// Start with the maximum slope
			rdThreshold = maxSlope;
			
			tileLengths = new int[nt];
			actualBytes = 0;
			
			// +------------------------------+
			// |  First we build the layers   |
			// +------------------------------+
			// Bitstream is simulated to know tile length
			for (int l = 0; l < num_Layers; l++)
			{
				//loop on layers
				
				maxBytes = layers[l].maxBytes;
				if (layers[l].optimize)
				{
					rdThreshold = optimizeBitstreamLayer(l, rdThreshold, maxBytes, actualBytes);
				}
				else
				{
					if (l <= 0 || l >= num_Layers - 1)
					{
						throw new System.ArgumentException("The first and the" + " last layer " + "thresholds" + " must be optimized");
					}
					rdThreshold = estimateLayerThreshold(maxBytes, layers[l - 1]);
				}
				
				for (int t = 0; t < nt; t++)
				{
					//loop on tiles
					if (l == 0)
					{
						// Tile header
						headEnc.reset();
						headEnc.encodeTilePartHeader(0, t);
						tileLengths[t] += headEnc.Length;
					}
					
					for (int c = 0; c < nc; c++)
					{
						//loop on components
						
						// set boolean sopUsed here (SOP markers)
						sopUsed = ((System.String) encSpec.sops.getTileDef(t)).ToUpper().Equals("on".ToUpper());
						// set boolean ephUsed here (EPH markers)
						ephUsed = ((System.String) encSpec.ephs.getTileDef(t)).ToUpper().Equals("on".ToUpper());
						
						// Go to LL band
						sb = src.getAnSubbandTree(t, c);
						mrl = sb.resLvl + 1;
						
						while (sb.subb_LL != null)
						{
							sb = sb.subb_LL;
						}
						
						for (int r = 0; r < mrl; r++)
						{
							// loop on resolution levels
							
							nPrec = numPrec[t][c][r].x * numPrec[t][c][r].y;
							for (int p = 0; p < nPrec; p++)
							{
								// loop on precincts
								
								findTruncIndices(l, c, r, t, sb, rdThreshold, p);
								
								hBuff = pktEnc.encodePacket(l + 1, c, r, t, cblks[t][c][r], truncIdxs[t][l][c][r], hBuff, bBuff, p);
								if (pktEnc.PacketWritable)
								{
									tmp = bsWriter.writePacketHead(hBuff.Buffer, hBuff.Length, true, sopUsed, ephUsed);
									tmp += bsWriter.writePacketBody(pktEnc.LastBodyBuf, pktEnc.LastBodyLen, true, pktEnc.ROIinPkt, pktEnc.ROILen);
									actualBytes += tmp;
									tileLengths[t] += tmp;
								}
							} // End loop on precincts
							sb = sb.parentband;
						} // End loop on resolution levels
					} // End loop on components
				} // end loop on tiles
				layers[l].rdThreshold = rdThreshold;
				layers[l].actualBytes = actualBytes;
			} // end loop on layers
			
#if DO_TIMING
			buildTime += (System.DateTime.Now.Ticks - 621355968000000000) / 10000 - stime;
			stime = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
#endif			
			// +--------------------------------------------------+
			// | Write tiles according to their Progression order |
			// +--------------------------------------------------+
			// Reset the packet encoder before writing all packets
			pktEnc.reset();
			Progression[] prog; // Progression(s) in each tile
			int cs, ce, rs, re, lye;
			
			int[] mrlc = new int[nc];
			for (int t = 0; t < nt; t++)
			{
				//loop on tiles
				//int[][] lysA; // layer index start for each component and
				// resolution level
				int[][] lys = new int[nc][];
				for (int c = 0; c < nc; c++)
				{
					mrlc[c] = src.getAnSubbandTree(t, c).resLvl;
					lys[c] = new int[mrlc[c] + 1];
				}
				
				// Tile header
				headEnc.reset();
				headEnc.encodeTilePartHeader(tileLengths[t], t);
				bsWriter.commitBitstreamHeader(headEnc);
				prog = (Progression[]) encSpec.pocs.getTileDef(t);
				
				for (int prg = 0; prg < prog.Length; prg++)
				{
					// Loop on progression
					lye = prog[prg].lye;
					cs = prog[prg].cs;
					ce = prog[prg].ce;
					rs = prog[prg].rs;
					re = prog[prg].re;
					
					switch (prog[prg].type)
					{
						
						case CSJ2K.j2k.codestream.ProgressionType.RES_LY_COMP_POS_PROG: 
							writeResLyCompPos(t, rs, re, cs, ce, lys, lye);
							break;
						
						case CSJ2K.j2k.codestream.ProgressionType.LY_RES_COMP_POS_PROG: 
							writeLyResCompPos(t, rs, re, cs, ce, lys, lye);
							break;
						
						case CSJ2K.j2k.codestream.ProgressionType.POS_COMP_RES_LY_PROG: 
							writePosCompResLy(t, rs, re, cs, ce, lys, lye);
							break;
						
						case CSJ2K.j2k.codestream.ProgressionType.COMP_POS_RES_LY_PROG: 
							writeCompPosResLy(t, rs, re, cs, ce, lys, lye);
							break;
						
						case CSJ2K.j2k.codestream.ProgressionType.RES_POS_COMP_LY_PROG: 
							writeResPosCompLy(t, rs, re, cs, ce, lys, lye);
							break;
						
						default: 
							throw new System.InvalidOperationException("Unsupported bit stream progression type");
						
					} // switch on progression
					
					// Update next first layer index 
					for (int c = cs; c < ce; c++)
						for (int r = rs; r < re; r++)
						{
							if (r > mrlc[c])
								continue;
							lys[c][r] = lye;
						}
				} // End loop on progression
			} // End loop on tiles
			
#if DO_TIMING
			writeTime += (System.DateTime.Now.Ticks - 621355968000000000) / 10000 - stime;
#endif
		}
		
		/// <summary> Write a piece of bit stream according to the
		/// RES_LY_COMP_POS_PROG progression mode and between given bounds
		/// 
		/// </summary>
		/// <param name="t">Tile index.
		/// 
		/// </param>
		/// <param name="rs">First resolution level index.
		/// 
		/// </param>
		/// <param name="re">Last resolution level index.
		/// 
		/// </param>
		/// <param name="cs">First component index.
		/// 
		/// </param>
		/// <param name="ce">Last component index.
		/// 
		/// </param>
		/// <param name="lys">First layer index for each component and resolution.
		/// 
		/// </param>
		/// <param name="lye">Index of the last layer.
		/// 
		/// </param>
		public virtual void  writeResLyCompPos(int t, int rs, int re, int cs, int ce, int[][] lys, int lye)
		{
			
			bool sopUsed; // Should SOP markers be used ?
			bool ephUsed; // Should EPH markers be used ?
			int nc = src.NumComps;
			int[] mrl = new int[nc];
			SubbandAn sb;
			float threshold;
			BitOutputBuffer hBuff = null;
			byte[] bBuff = null;
			int nPrec = 0;
			
			// Max number of resolution levels in the tile
			int maxResLvl = 0;
			for (int c = 0; c < nc; c++)
			{
				mrl[c] = src.getAnSubbandTree(t, c).resLvl;
				if (mrl[c] > maxResLvl)
					maxResLvl = mrl[c];
			}
			
			int minlys; // minimum layer start index of each component
			
			for (int r = rs; r < re; r++)
			{
				//loop on resolution levels
				if (r > maxResLvl)
					continue;
				
				minlys = 100000;
				for (int c = cs; c < ce; c++)
				{
					if (r < lys[c].Length && lys[c][r] < minlys)
					{
						minlys = lys[c][r];
					}
				}
				
				for (int l = minlys; l < lye; l++)
				{
					//loop on layers
					for (int c = cs; c < ce; c++)
					{
						//loop on components
						if (r >= lys[c].Length)
							continue;
						if (l < lys[c][r])
							continue;
						
						// If no more decomposition levels for this component
						if (r > mrl[c])
							continue;
						
						nPrec = numPrec[t][c][r].x * numPrec[t][c][r].y;
						for (int p = 0; p < nPrec; p++)
						{
							// loop on precincts
							
							// set boolean sopUsed here (SOP markers)
							sopUsed = ((System.String) encSpec.sops.getTileDef(t)).Equals("on");
							// set boolean ephUsed here (EPH markers)
							ephUsed = ((System.String) encSpec.ephs.getTileDef(t)).Equals("on");
							
							sb = src.getAnSubbandTree(t, c);
							for (int i = mrl[c]; i > r; i--)
							{
								sb = sb.subb_LL;
							}
							
							threshold = layers[l].rdThreshold;
							findTruncIndices(l, c, r, t, sb, threshold, p);
							
							hBuff = pktEnc.encodePacket(l + 1, c, r, t, cblks[t][c][r], truncIdxs[t][l][c][r], hBuff, bBuff, p);
							
							if (pktEnc.PacketWritable)
							{
								bsWriter.writePacketHead(hBuff.Buffer, hBuff.Length, false, sopUsed, ephUsed);
								bsWriter.writePacketBody(pktEnc.LastBodyBuf, pktEnc.LastBodyLen, false, pktEnc.ROIinPkt, pktEnc.ROILen);
							}
						} // End loop on precincts
					} // End loop on components
				} // End loop on layers
			} // End loop on resolution levels
		}
		
		/// <summary> Write a piece of bit stream according to the
		/// LY_RES_COMP_POS_PROG progression mode and between given bounds
		/// 
		/// </summary>
		/// <param name="t">Tile index.
		/// 
		/// </param>
		/// <param name="rs">First resolution level index.
		/// 
		/// </param>
		/// <param name="re">Last resolution level index.
		/// 
		/// </param>
		/// <param name="cs">First component index.
		/// 
		/// </param>
		/// <param name="ce">Last component index.
		/// 
		/// </param>
		/// <param name="lys">First layer index for each component and resolution.
		/// 
		/// </param>
		/// <param name="lye">Index of the last layer.
		/// 
		/// </param>
		public virtual void  writeLyResCompPos(int t, int rs, int re, int cs, int ce, int[][] lys, int lye)
		{
			
			bool sopUsed; // Should SOP markers be used ?
			bool ephUsed; // Should EPH markers be used ?
			int nc = src.NumComps;
			int mrl;
			SubbandAn sb;
			float threshold;
			BitOutputBuffer hBuff = null;
			byte[] bBuff = null;
			int nPrec = 0;
			
			int minlys = 100000; // minimum layer start index of each component
			for (int c = cs; c < ce; c++)
			{
				for (int r = 0; r < lys.Length; r++)
				{
					if (lys[c] != null && r < lys[c].Length && lys[c][r] < minlys)
					{
						minlys = lys[c][r];
					}
				}
			}
			
			for (int l = minlys; l < lye; l++)
			{
				// loop on layers
				for (int r = rs; r < re; r++)
				{
					// loop on resolution level
					for (int c = cs; c < ce; c++)
					{
						// loop on components
						mrl = src.getAnSubbandTree(t, c).resLvl;
						if (r > mrl)
							continue;
						if (r >= lys[c].Length)
							continue;
						if (l < lys[c][r])
							continue;
						
						nPrec = numPrec[t][c][r].x * numPrec[t][c][r].y;
						for (int p = 0; p < nPrec; p++)
						{
							// loop on precincts
							
							// set boolean sopUsed here (SOP markers)
							sopUsed = ((System.String) encSpec.sops.getTileDef(t)).Equals("on");
							// set boolean ephUsed here (EPH markers)
							ephUsed = ((System.String) encSpec.ephs.getTileDef(t)).Equals("on");
							
							sb = src.getAnSubbandTree(t, c);
							for (int i = mrl; i > r; i--)
							{
								sb = sb.subb_LL;
							}
							
							threshold = layers[l].rdThreshold;
							findTruncIndices(l, c, r, t, sb, threshold, p);
							
							hBuff = pktEnc.encodePacket(l + 1, c, r, t, cblks[t][c][r], truncIdxs[t][l][c][r], hBuff, bBuff, p);
							
							if (pktEnc.PacketWritable)
							{
								bsWriter.writePacketHead(hBuff.Buffer, hBuff.Length, false, sopUsed, ephUsed);
								bsWriter.writePacketBody(pktEnc.LastBodyBuf, pktEnc.LastBodyLen, false, pktEnc.ROIinPkt, pktEnc.ROILen);
							}
						} // end loop on precincts
					} // end loop on components
				} // end loop on resolution levels
			} // end loop on layers
		}
		
		/// <summary> Write a piece of bit stream according to the
		/// COMP_POS_RES_LY_PROG progression mode and between given bounds
		/// 
		/// </summary>
		/// <param name="t">Tile index.
		/// 
		/// </param>
		/// <param name="rs">First resolution level index.
		/// 
		/// </param>
		/// <param name="re">Last resolution level index.
		/// 
		/// </param>
		/// <param name="cs">First component index.
		/// 
		/// </param>
		/// <param name="ce">Last component index.
		/// 
		/// </param>
		/// <param name="lys">First layer index for each component and resolution.
		/// 
		/// </param>
		/// <param name="lye">Index of the last layer.
		/// 
		/// </param>
		public virtual void  writePosCompResLy(int t, int rs, int re, int cs, int ce, int[][] lys, int lye)
		{
			
			bool sopUsed; // Should SOP markers be used ?
			bool ephUsed; // Should EPH markers be used ?
			int nc = src.NumComps;
			int mrl;
			SubbandAn sb;
			float threshold;
			BitOutputBuffer hBuff = null;
			byte[] bBuff = null;
			
			// Computes current tile offset in the reference grid
			Coord nTiles = src.getNumTiles(null);
			Coord tileI = src.getTile(null);
			int x0siz = src.ImgULX;
			int y0siz = src.ImgULY;
			int xsiz = x0siz + src.ImgWidth;
			int ysiz = y0siz + src.ImgHeight;
			int xt0siz = src.TilePartULX;
			int yt0siz = src.TilePartULY;
			int xtsiz = src.NomTileWidth;
			int ytsiz = src.NomTileHeight;
			int tx0 = (tileI.x == 0)?x0siz:xt0siz + tileI.x * xtsiz;
			int ty0 = (tileI.y == 0)?y0siz:yt0siz + tileI.y * ytsiz;
			int tx1 = (tileI.x != nTiles.x - 1)?xt0siz + (tileI.x + 1) * xtsiz:xsiz;
			int ty1 = (tileI.y != nTiles.y - 1)?yt0siz + (tileI.y + 1) * ytsiz:ysiz;
			
			// Get precinct information (number,distance between two consecutive
			// precincts in the reference grid) in each component and resolution
			// level
			PrecInfo prec; // temporary variable
			int p; // Current precinct index
			int gcd_x = 0; // Horiz. distance between 2 precincts in the ref. grid
			int gcd_y = 0; // Vert. distance between 2 precincts in the ref. grid
			int nPrec = 0; // Total number of found precincts
			int[][] nextPrec = new int[ce][]; // Next precinct index in each
			// component and resolution level
			int minlys = 100000; // minimum layer start index of each component
			int minx = tx1; // Horiz. offset of the second precinct in the
			// reference grid
			int miny = ty1; // Vert. offset of the second precinct in the
			// reference grid. 
			int maxx = tx0; // Max. horiz. offset of precincts in the ref. grid
			int maxy = ty0; // Max. vert. offset of precincts in the ref. grid
			for (int c = cs; c < ce; c++)
			{
				mrl = src.getAnSubbandTree(t, c).resLvl;
				nextPrec[c] = new int[mrl + 1];
				for (int r = rs; r < re; r++)
				{
					if (r > mrl)
						continue;
					if (r < lys[c].Length && lys[c][r] < minlys)
					{
						minlys = lys[c][r];
					}
					p = numPrec[t][c][r].y * numPrec[t][c][r].x - 1;
					for (; p >= 0; p--)
					{
						prec = pktEnc.getPrecInfo(t, c, r, p);
						if (prec.rgulx != tx0)
						{
							if (prec.rgulx < minx)
								minx = prec.rgulx;
							if (prec.rgulx > maxx)
								maxx = prec.rgulx;
						}
						if (prec.rguly != ty0)
						{
							if (prec.rguly < miny)
								miny = prec.rguly;
							if (prec.rguly > maxy)
								maxy = prec.rguly;
						}
						
						if (nPrec == 0)
						{
							gcd_x = prec.rgw;
							gcd_y = prec.rgh;
						}
						else
						{
							gcd_x = MathUtil.gcd(gcd_x, prec.rgw);
							gcd_y = MathUtil.gcd(gcd_y, prec.rgh);
						}
						nPrec++;
					} // precincts
				} // resolution levels
			} // components
			
			if (nPrec == 0)
			{
				throw new System.InvalidOperationException("Image cannot have no precinct");
			}
			
			int pyend = (maxy - miny) / gcd_y + 1;
			int pxend = (maxx - minx) / gcd_x + 1;
			int y = ty0;
			int x = tx0;
			for (int py = 0; py <= pyend; py++)
			{
				// Vertical precincts
				for (int px = 0; px <= pxend; px++)
				{
					// Horiz. precincts
					for (int c = cs; c < ce; c++)
					{
						// Components
						mrl = src.getAnSubbandTree(t, c).resLvl;
						for (int r = rs; r < re; r++)
						{
							// Resolution levels
							if (r > mrl)
								continue;
							if (nextPrec[c][r] >= numPrec[t][c][r].x * numPrec[t][c][r].y)
							{
								continue;
							}
							prec = pktEnc.getPrecInfo(t, c, r, nextPrec[c][r]);
							if ((prec.rgulx != x) || (prec.rguly != y))
							{
								continue;
							}
							for (int l = minlys; l < lye; l++)
							{
								// Layers
								if (r >= lys[c].Length)
									continue;
								if (l < lys[c][r])
									continue;
								
								// set boolean sopUsed here (SOP markers)
								sopUsed = ((System.String) encSpec.sops.getTileDef(t)).Equals("on");
								// set boolean ephUsed here (EPH markers)
								ephUsed = ((System.String) encSpec.ephs.getTileDef(t)).Equals("on");
								
								sb = src.getAnSubbandTree(t, c);
								for (int i = mrl; i > r; i--)
								{
									sb = sb.subb_LL;
								}
								
								threshold = layers[l].rdThreshold;
								findTruncIndices(l, c, r, t, sb, threshold, nextPrec[c][r]);
								
								hBuff = pktEnc.encodePacket(l + 1, c, r, t, cblks[t][c][r], truncIdxs[t][l][c][r], hBuff, bBuff, nextPrec[c][r]);
								
								if (pktEnc.PacketWritable)
								{
									bsWriter.writePacketHead(hBuff.Buffer, hBuff.Length, false, sopUsed, ephUsed);
									bsWriter.writePacketBody(pktEnc.LastBodyBuf, pktEnc.LastBodyLen, false, pktEnc.ROIinPkt, pktEnc.ROILen);
								}
							} // layers
							nextPrec[c][r]++;
						} // Resolution levels
					} // Components
					if (px != pxend)
					{
						x = minx + px * gcd_x;
					}
					else
					{
						x = tx0;
					}
				} // Horizontal precincts
				if (py != pyend)
				{
					y = miny + py * gcd_y;
				}
				else
				{
					y = ty0;
				}
			} // Vertical precincts
			
			// Check that all precincts have been written
			for (int c = cs; c < ce; c++)
			{
				mrl = src.getAnSubbandTree(t, c).resLvl;
				for (int r = rs; r < re; r++)
				{
					if (r > mrl)
						continue;
					if (nextPrec[c][r] < numPrec[t][c][r].x * numPrec[t][c][r].y - 1)
					{
						throw new System.InvalidOperationException("JJ2000 bug: One precinct at least has " + "not been written for resolution level " + r + " of component " + c + " in tile " + t + ".");
					}
				}
			}
		}
		
		/// <summary> Write a piece of bit stream according to the
		/// COMP_POS_RES_LY_PROG progression mode and between given bounds
		/// 
		/// </summary>
		/// <param name="t">Tile index.
		/// 
		/// </param>
		/// <param name="rs">First resolution level index.
		/// 
		/// </param>
		/// <param name="re">Last resolution level index.
		/// 
		/// </param>
		/// <param name="cs">First component index.
		/// 
		/// </param>
		/// <param name="ce">Last component index.
		/// 
		/// </param>
		/// <param name="lys">First layer index for each component and resolution.
		/// 
		/// </param>
		/// <param name="lye">Index of the last layer.
		/// 
		/// </param>
		public virtual void  writeCompPosResLy(int t, int rs, int re, int cs, int ce, int[][] lys, int lye)
		{
			
			bool sopUsed; // Should SOP markers be used ?
			bool ephUsed; // Should EPH markers be used ?
			int nc = src.NumComps;
			int mrl;
			SubbandAn sb;
			float threshold;
			BitOutputBuffer hBuff = null;
			byte[] bBuff = null;
			
			// Computes current tile offset in the reference grid
			Coord nTiles = src.getNumTiles(null);
			Coord tileI = src.getTile(null);
			int x0siz = src.ImgULX;
			int y0siz = src.ImgULY;
			int xsiz = x0siz + src.ImgWidth;
			int ysiz = y0siz + src.ImgHeight;
			int xt0siz = src.TilePartULX;
			int yt0siz = src.TilePartULY;
			int xtsiz = src.NomTileWidth;
			int ytsiz = src.NomTileHeight;
			int tx0 = (tileI.x == 0)?x0siz:xt0siz + tileI.x * xtsiz;
			int ty0 = (tileI.y == 0)?y0siz:yt0siz + tileI.y * ytsiz;
			int tx1 = (tileI.x != nTiles.x - 1)?xt0siz + (tileI.x + 1) * xtsiz:xsiz;
			int ty1 = (tileI.y != nTiles.y - 1)?yt0siz + (tileI.y + 1) * ytsiz:ysiz;
			
			// Get precinct information (number,distance between two consecutive
			// precincts in the reference grid) in each component and resolution
			// level
			PrecInfo prec; // temporary variable
			int p; // Current precinct index
			int gcd_x = 0; // Horiz. distance between 2 precincts in the ref. grid
			int gcd_y = 0; // Vert. distance between 2 precincts in the ref. grid
			int nPrec = 0; // Total number of found precincts
			int[][] nextPrec = new int[ce][]; // Next precinct index in each
			// component and resolution level
			int minlys = 100000; // minimum layer start index of each component
			int minx = tx1; // Horiz. offset of the second precinct in the
			// reference grid
			int miny = ty1; // Vert. offset of the second precinct in the
			// reference grid. 
			int maxx = tx0; // Max. horiz. offset of precincts in the ref. grid
			int maxy = ty0; // Max. vert. offset of precincts in the ref. grid
			for (int c = cs; c < ce; c++)
			{
				mrl = src.getAnSubbandTree(t, c).resLvl;
				for (int r = rs; r < re; r++)
				{
					if (r > mrl)
						continue;
					nextPrec[c] = new int[mrl + 1];
					if (r < lys[c].Length && lys[c][r] < minlys)
					{
						minlys = lys[c][r];
					}
					p = numPrec[t][c][r].y * numPrec[t][c][r].x - 1;
					for (; p >= 0; p--)
					{
						prec = pktEnc.getPrecInfo(t, c, r, p);
						if (prec.rgulx != tx0)
						{
							if (prec.rgulx < minx)
								minx = prec.rgulx;
							if (prec.rgulx > maxx)
								maxx = prec.rgulx;
						}
						if (prec.rguly != ty0)
						{
							if (prec.rguly < miny)
								miny = prec.rguly;
							if (prec.rguly > maxy)
								maxy = prec.rguly;
						}
						
						if (nPrec == 0)
						{
							gcd_x = prec.rgw;
							gcd_y = prec.rgh;
						}
						else
						{
							gcd_x = MathUtil.gcd(gcd_x, prec.rgw);
							gcd_y = MathUtil.gcd(gcd_y, prec.rgh);
						}
						nPrec++;
					} // precincts
				} // resolution levels
			} // components
			
			if (nPrec == 0)
			{
				throw new System.InvalidOperationException("Image cannot have no precinct");
			}
			
			int pyend = (maxy - miny) / gcd_y + 1;
			int pxend = (maxx - minx) / gcd_x + 1;
			int y;
			int x;
			for (int c = cs; c < ce; c++)
			{
				// Loop on components
				y = ty0;
				x = tx0;
				mrl = src.getAnSubbandTree(t, c).resLvl;
				for (int py = 0; py <= pyend; py++)
				{
					// Vertical precincts
					for (int px = 0; px <= pxend; px++)
					{
						// Horiz. precincts
						for (int r = rs; r < re; r++)
						{
							// Resolution levels
							if (r > mrl)
								continue;
							if (nextPrec[c][r] >= numPrec[t][c][r].x * numPrec[t][c][r].y)
							{
								continue;
							}
							prec = pktEnc.getPrecInfo(t, c, r, nextPrec[c][r]);
							if ((prec.rgulx != x) || (prec.rguly != y))
							{
								continue;
							}
							
							for (int l = minlys; l < lye; l++)
							{
								// Layers
								if (r >= lys[c].Length)
									continue;
								if (l < lys[c][r])
									continue;
								
								// set boolean sopUsed here (SOP markers)
								sopUsed = ((System.String) encSpec.sops.getTileDef(t)).Equals("on");
								// set boolean ephUsed here (EPH markers)
								ephUsed = ((System.String) encSpec.ephs.getTileDef(t)).Equals("on");
								
								sb = src.getAnSubbandTree(t, c);
								for (int i = mrl; i > r; i--)
								{
									sb = sb.subb_LL;
								}
								
								threshold = layers[l].rdThreshold;
								findTruncIndices(l, c, r, t, sb, threshold, nextPrec[c][r]);
								
								hBuff = pktEnc.encodePacket(l + 1, c, r, t, cblks[t][c][r], truncIdxs[t][l][c][r], hBuff, bBuff, nextPrec[c][r]);
								
								if (pktEnc.PacketWritable)
								{
									bsWriter.writePacketHead(hBuff.Buffer, hBuff.Length, false, sopUsed, ephUsed);
									bsWriter.writePacketBody(pktEnc.LastBodyBuf, pktEnc.LastBodyLen, false, pktEnc.ROIinPkt, pktEnc.ROILen);
								}
							} // Layers
							nextPrec[c][r]++;
						} // Resolution levels                    
						if (px != pxend)
						{
							x = minx + px * gcd_x;
						}
						else
						{
							x = tx0;
						}
					} // Horizontal precincts
					if (py != pyend)
					{
						y = miny + py * gcd_y;
					}
					else
					{
						y = ty0;
					}
				} // Vertical precincts
			} // components
			
			// Check that all precincts have been written
			for (int c = cs; c < ce; c++)
			{
				mrl = src.getAnSubbandTree(t, c).resLvl;
				for (int r = rs; r < re; r++)
				{
					if (r > mrl)
						continue;
					if (nextPrec[c][r] < numPrec[t][c][r].x * numPrec[t][c][r].y - 1)
					{
						throw new System.InvalidOperationException("JJ2000 bug: One precinct at least has " + "not been written for resolution level " + r + " of component " + c + " in tile " + t + ".");
					}
				}
			}
		}
		
		/// <summary> Write a piece of bit stream according to the
		/// RES_POS_COMP_LY_PROG progression mode and between given bounds
		/// 
		/// </summary>
		/// <param name="t">Tile index.
		/// 
		/// </param>
		/// <param name="rs">First resolution level index.
		/// 
		/// </param>
		/// <param name="re">Last resolution level index.
		/// 
		/// </param>
		/// <param name="cs">First component index.
		/// 
		/// </param>
		/// <param name="ce">Last component index.
		/// 
		/// </param>
		/// <param name="lys">First layer index for each component and resolution.
		/// 
		/// </param>
		/// <param name="lye">Last layer index.
		/// 
		/// </param>
		public virtual void  writeResPosCompLy(int t, int rs, int re, int cs, int ce, int[][] lys, int lye)
		{
			
			bool sopUsed; // Should SOP markers be used ?
			bool ephUsed; // Should EPH markers be used ?
			int nc = src.NumComps;
			int mrl;
			SubbandAn sb;
			float threshold;
			BitOutputBuffer hBuff = null;
			byte[] bBuff = null;
			
			// Computes current tile offset in the reference grid
			Coord nTiles = src.getNumTiles(null);
			Coord tileI = src.getTile(null);
			int x0siz = src.ImgULX;
			int y0siz = src.ImgULY;
			int xsiz = x0siz + src.ImgWidth;
			int ysiz = y0siz + src.ImgHeight;
			int xt0siz = src.TilePartULX;
			int yt0siz = src.TilePartULY;
			int xtsiz = src.NomTileWidth;
			int ytsiz = src.NomTileHeight;
			int tx0 = (tileI.x == 0)?x0siz:xt0siz + tileI.x * xtsiz;
			int ty0 = (tileI.y == 0)?y0siz:yt0siz + tileI.y * ytsiz;
			int tx1 = (tileI.x != nTiles.x - 1)?xt0siz + (tileI.x + 1) * xtsiz:xsiz;
			int ty1 = (tileI.y != nTiles.y - 1)?yt0siz + (tileI.y + 1) * ytsiz:ysiz;
			
			// Get precinct information (number,distance between two consecutive
			// precincts in the reference grid) in each component and resolution
			// level
			PrecInfo prec; // temporary variable
			int p; // Current precinct index
			int gcd_x = 0; // Horiz. distance between 2 precincts in the ref. grid
			int gcd_y = 0; // Vert. distance between 2 precincts in the ref. grid
			int nPrec = 0; // Total number of found precincts
			int[][] nextPrec = new int[ce][]; // Next precinct index in each
			// component and resolution level
			int minlys = 100000; // minimum layer start index of each component
			int minx = tx1; // Horiz. offset of the second precinct in the
			// reference grid
			int miny = ty1; // Vert. offset of the second precinct in the
			// reference grid. 
			int maxx = tx0; // Max. horiz. offset of precincts in the ref. grid
			int maxy = ty0; // Max. vert. offset of precincts in the ref. grid
			for (int c = cs; c < ce; c++)
			{
				mrl = src.getAnSubbandTree(t, c).resLvl;
				nextPrec[c] = new int[mrl + 1];
				for (int r = rs; r < re; r++)
				{
					if (r > mrl)
						continue;
					if (r < lys[c].Length && lys[c][r] < minlys)
					{
						minlys = lys[c][r];
					}
					p = numPrec[t][c][r].y * numPrec[t][c][r].x - 1;
					for (; p >= 0; p--)
					{
						prec = pktEnc.getPrecInfo(t, c, r, p);
						if (prec.rgulx != tx0)
						{
							if (prec.rgulx < minx)
								minx = prec.rgulx;
							if (prec.rgulx > maxx)
								maxx = prec.rgulx;
						}
						if (prec.rguly != ty0)
						{
							if (prec.rguly < miny)
								miny = prec.rguly;
							if (prec.rguly > maxy)
								maxy = prec.rguly;
						}
						
						if (nPrec == 0)
						{
							gcd_x = prec.rgw;
							gcd_y = prec.rgh;
						}
						else
						{
							gcd_x = MathUtil.gcd(gcd_x, prec.rgw);
							gcd_y = MathUtil.gcd(gcd_y, prec.rgh);
						}
						nPrec++;
					} // precincts
				} // resolution levels
			} // components
			
			if (nPrec == 0)
			{
				throw new System.InvalidOperationException("Image cannot have no precinct");
			}
			
			int pyend = (maxy - miny) / gcd_y + 1;
			int pxend = (maxx - minx) / gcd_x + 1;
			int x, y;
			for (int r = rs; r < re; r++)
			{
				// Resolution levels
				y = ty0;
				x = tx0;
				for (int py = 0; py <= pyend; py++)
				{
					// Vertical precincts
					for (int px = 0; px <= pxend; px++)
					{
						// Horiz. precincts
						for (int c = cs; c < ce; c++)
						{
							// Components
							mrl = src.getAnSubbandTree(t, c).resLvl;
							if (r > mrl)
								continue;
							if (nextPrec[c][r] >= numPrec[t][c][r].x * numPrec[t][c][r].y)
							{
								continue;
							}
							prec = pktEnc.getPrecInfo(t, c, r, nextPrec[c][r]);
							if ((prec.rgulx != x) || (prec.rguly != y))
							{
								continue;
							}
							for (int l = minlys; l < lye; l++)
							{
								if (r >= lys[c].Length)
									continue;
								if (l < lys[c][r])
									continue;
								
								// set boolean sopUsed here (SOP markers)
								sopUsed = ((System.String) encSpec.sops.getTileDef(t)).Equals("on");
								// set boolean ephUsed here (EPH markers)
								ephUsed = ((System.String) encSpec.ephs.getTileDef(t)).Equals("on");
								
								sb = src.getAnSubbandTree(t, c);
								for (int i = mrl; i > r; i--)
								{
									sb = sb.subb_LL;
								}
								
								threshold = layers[l].rdThreshold;
								findTruncIndices(l, c, r, t, sb, threshold, nextPrec[c][r]);
								
								hBuff = pktEnc.encodePacket(l + 1, c, r, t, cblks[t][c][r], truncIdxs[t][l][c][r], hBuff, bBuff, nextPrec[c][r]);
								
								if (pktEnc.PacketWritable)
								{
									bsWriter.writePacketHead(hBuff.Buffer, hBuff.Length, false, sopUsed, ephUsed);
									bsWriter.writePacketBody(pktEnc.LastBodyBuf, pktEnc.LastBodyLen, false, pktEnc.ROIinPkt, pktEnc.ROILen);
								}
							} // layers
							nextPrec[c][r]++;
						} // Components
						if (px != pxend)
						{
							x = minx + px * gcd_x;
						}
						else
						{
							x = tx0;
						}
					} // Horizontal precincts
					if (py != pyend)
					{
						y = miny + py * gcd_y;
					}
					else
					{
						y = ty0;
					}
				} // Vertical precincts
			} // Resolution levels
			
			// Check that all precincts have been written
			for (int c = cs; c < ce; c++)
			{
				mrl = src.getAnSubbandTree(t, c).resLvl;
				for (int r = rs; r < re; r++)
				{
					if (r > mrl)
						continue;
					if (nextPrec[c][r] < numPrec[t][c][r].x * numPrec[t][c][r].y - 1)
					{
						throw new System.InvalidOperationException("JJ2000 bug: One precinct at least has " + "not been written for resolution level " + r + " of component " + c + " in tile " + t + ".");
					}
				}
			}
		}
		
		/// <summary> This function implements the rate-distortion optimization algorithm.
		/// It saves the state of any previously generated bit-stream layers and
		/// then simulate the formation of a new layer in the bit stream as often
		/// as necessary to find the smallest rate-distortion threshold such that
		/// the total number of bytes required to represent the layer does not
		/// exceed `maxBytes' minus `prevBytes'.  It then restores the state of any
		/// previously generated bit-stream layers and returns the threshold.
		/// 
		/// </summary>
		/// <param name="layerIdx">The index of the current layer
		/// 
		/// </param>
		/// <param name="fmaxt">The maximum admissible slope value. Normally the threshold
		/// slope of the previous layer.
		/// 
		/// </param>
		/// <param name="maxBytes">The maximum number of bytes that can be written. It
		/// includes the length of the current layer bistream length and all the
		/// previous layers bit streams.
		/// 
		/// </param>
		/// <param name="prevBytes">The number of bytes of all the previous layers.
		/// 
		/// </param>
		/// <returns> The value of the slope threshold.
		/// 
		/// </returns>
		private float optimizeBitstreamLayer(int layerIdx, float fmaxt, int maxBytes, int prevBytes)
		{
			
			int nt; // The total number of tiles
			int nc; // The total number of components
			int numLvls; // The total number of resolution levels
			int actualBytes; // Actual number of bytes for a layer
			float fmint; // Minimum of the current threshold interval
			float ft; // Current threshold
			SubbandAn sb; // Current subband
			BitOutputBuffer hBuff; // The packet head buffer
			byte[] bBuff; // The packet body buffer
			int sidx; // The index in the summary table
			bool sopUsed; // Should SOP markers be used ?
			bool ephUsed; // Should EPH markers be used ?
			//int precinctIdx; // Precinct index for current packet
			int nPrec; // Number of precincts in the current resolution level
			
			// Save the packet encoder state
			pktEnc.save();
			
			nt = src.getNumTiles();
			nc = src.NumComps;
			hBuff = null;
			bBuff = null;
			
			// Estimate the minimum slope to start with from the summary
			// information in 'RDSlopesRates'. This is a real minimum since it
			// does not include the packet head overhead, which is always
			// non-zero.
			
			// Look for the summary entry that gives 'maxBytes' or more data
			for (sidx = RD_SUMMARY_SIZE - 1; sidx > 0; sidx--)
			{
				if (RDSlopesRates[sidx] >= maxBytes)
				{
					break;
				}
			}
			// Get the corresponding minimum slope
			fmint = getSlopeFromSIndex(sidx);
			// Ensure that it is smaller the maximum slope
			if (fmint >= fmaxt)
			{
				sidx--;
				fmint = getSlopeFromSIndex(sidx);
			}
			// If we are using the last entry of the summary, then that
			// corresponds to all the data, Thus, set the minimum slope to 0.
			if (sidx <= 0)
				fmint = 0;
			
			// We look for the best threshold 'ft', which is the lowest threshold
			// that generates no more than 'maxBytes' code bytes.
			
			// The search is done iteratively using a binary split algorithm. We
			// start with 'fmaxt' as the maximum possible threshold, and 'fmint'
			// as the minimum threshold. The threshold 'ft' is calculated as the
			// middle point of 'fmaxt'-'fmint' interval. The 'fmaxt' or 'fmint'
			// bounds are moved according to the number of bytes obtained from a
			// simulation, where 'ft' is used as the threshold.
			
			// We stop whenever the interval is sufficiently small, and thus
			// enough precision is achieved.
			
			// Initialize threshold as the middle point of the interval.
			ft = (fmaxt + fmint) / 2f;
			// If 'ft' reaches 'fmint' it means that 'fmaxt' and 'fmint' are so
			// close that the average is 'fmint', due to rounding. Force it to
			// 'fmaxt' instead, since 'fmint' is normally an exclusive lower
			// bound.
			if (ft <= fmint)
				ft = fmaxt;
			
			do 
			{
				// Get the number of bytes used by this layer, if 'ft' is the
				// threshold, by simulation.
				actualBytes = prevBytes;
				src.setTile(0, 0);
				
				for (int t = 0; t < nt; t++)
				{
					for (int c = 0; c < nc; c++)
					{
						// set boolean sopUsed here (SOP markers)
						sopUsed = ((System.String) encSpec.sops.getTileDef(t)).ToUpper().Equals("on".ToUpper());
						// set boolean ephUsed here (EPH markers)
						ephUsed = ((System.String) encSpec.ephs.getTileDef(t)).ToUpper().Equals("on".ToUpper());
						
						// Get LL subband
						sb = (SubbandAn) src.getAnSubbandTree(t, c);
						numLvls = sb.resLvl + 1;
						sb = (SubbandAn) sb.getSubbandByIdx(0, 0);
						//loop on resolution levels
						for (int r = 0; r < numLvls; r++)
						{
							
							nPrec = numPrec[t][c][r].x * numPrec[t][c][r].y;
							for (int p = 0; p < nPrec; p++)
							{
								
								findTruncIndices(layerIdx, c, r, t, sb, ft, p);
								hBuff = pktEnc.encodePacket(layerIdx + 1, c, r, t, cblks[t][c][r], truncIdxs[t][layerIdx][c][r], hBuff, bBuff, p);
								
								if (pktEnc.PacketWritable)
								{
									bBuff = pktEnc.LastBodyBuf;
									actualBytes += bsWriter.writePacketHead(hBuff.Buffer, hBuff.Length, true, sopUsed, ephUsed);
									actualBytes += bsWriter.writePacketBody(bBuff, pktEnc.LastBodyLen, true, pktEnc.ROIinPkt, pktEnc.ROILen);
								}
							} // end loop on precincts
							sb = sb.parentband;
						} // End loop on resolution levels
					} // End loop on components
				} // End loop on tiles
				
				// Move the interval bounds according to simulation result
				if (actualBytes > maxBytes)
				{
					// 'ft' is too low and generates too many bytes, make it the
					// new minimum.
					fmint = ft;
				}
				else
				{
					// 'ft' is too high and does not generate as many bytes as we
					// are allowed too, make it the new maximum.
					fmaxt = ft;
				}
				
				// Update 'ft' for the new iteration as the middle point of the
				// new interval.
				ft = (fmaxt + fmint) / 2f;
				// If 'ft' reaches 'fmint' it means that 'fmaxt' and 'fmint' are
				// so close that the average is 'fmint', due to rounding. Force it
				// to 'fmaxt' instead, since 'fmint' is normally an exclusive
				// lower bound.
				if (ft <= fmint)
					ft = fmaxt;
				
				// Restore previous packet encoder state
				pktEnc.restore();
				
				// We continue to iterate, until the threshold reaches the upper
				// limit of the interval, within a FLOAT_REL_PRECISION relative
				// tolerance, or a FLOAT_ABS_PRECISION absolute tolerance. This is
				// the sign that the interval is sufficiently small.
			}
			while (ft < fmaxt * (1f - FLOAT_REL_PRECISION) && ft < (fmaxt - FLOAT_ABS_PRECISION));
			
			// If we have a threshold which is close to 0, set it to 0 so that
			// everything is taken into the layer. This is to avoid not sending
			// some least significant bit-planes in the lossless case. We use the
			// FLOAT_ABS_PRECISION value as a measure of "close" to 0.
			if (ft <= FLOAT_ABS_PRECISION)
			{
				ft = 0f;
			}
			else
			{
				// Otherwise make the threshold 'fmaxt', just to be sure that we
				// will not send more bytes than allowed.
				ft = fmaxt;
			}
			return ft;
		}
		
		/// <summary> This function attempts to estimate a rate-distortion slope threshold
		/// which will achieve a target number of code bytes close the
		/// `targetBytes' value.
		/// 
		/// </summary>
		/// <param name="targetBytes">The target number of bytes for the current layer
		/// 
		/// </param>
		/// <param name="lastLayer">The previous layer information.
		/// 
		/// </param>
		/// <returns> The value of the slope threshold for the estimated layer
		/// 
		/// </returns>
		private float estimateLayerThreshold(int targetBytes, EBCOTLayer lastLayer)
		{
			float log_sl1; // The log of the first slope used for interpolation
			float log_sl2; // The log of the second slope used for interpolation
			float log_len1; // The log of the first length used for interpolation
			float log_len2; // The log of the second length used for interpolation
			float log_isl; // The log of the interpolated slope
			float log_ilen; // Log of the interpolated length
			float log_ab; // Log of actual bytes in last layer
			int sidx; // Index into the summary R-D info array
			float log_off; // The log of the offset proportion
			int tlen; // The corrected target layer length
			float lthresh; // The threshold of the last layer
			float eth; // The estimated threshold
			
			// In order to estimate the threshold we base ourselves in the summary
			// R-D info in RDSlopesRates. In order to use it we must compensate
			// for the overhead of the packet heads. The proportion of overhead is
			// estimated using the last layer simulation results.
			
			// NOTE: the model used in this method is that the slope varies
			// linearly with the log of the rate (i.e. length).
			
			// NOTE: the model used in this method is that the distortion is
			// proprotional to a power of the rate. Thus, the slope is also
			// proportional to another power of the rate. This translates as the
			// log of the slope varies linearly with the log of the rate, which is
			// what we use.
			
			// 1) Find the offset of the length predicted from the summary R-D
			// information, to the actual length by using the last layer.
			
			// We ensure that the threshold we use for estimation actually
			// includes some data.
			lthresh = lastLayer.rdThreshold;
			if (lthresh > maxSlope)
				lthresh = maxSlope;
			// If the slope of the last layer is too small then we just include
			// all the rest (not possible to do better).
			if (lthresh < FLOAT_ABS_PRECISION)
				return 0f;
			sidx = getLimitedSIndexFromSlope(lthresh);
			// If the index is outside of the summary info array use the last two, 
			// or first two, indexes, as appropriate
			if (sidx >= RD_SUMMARY_SIZE - 1)
				sidx = RD_SUMMARY_SIZE - 2;
			
			// Get the logs of the lengths and the slopes
			
			if (RDSlopesRates[sidx + 1] == 0)
			{
				// Pathological case, we can not use log of 0. Add
				// RDSlopesRates[sidx]+1 bytes to the rates (just a crude simple
				// solution to this rare case)
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_len1 = (float) System.Math.Log((RDSlopesRates[sidx] << 1) + 1);
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_len2 = (float) System.Math.Log(RDSlopesRates[sidx] + 1);
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_ab = (float) System.Math.Log(lastLayer.actualBytes + RDSlopesRates[sidx] + 1);
			}
			else
			{
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_len1 = (float) System.Math.Log(RDSlopesRates[sidx]);
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_len2 = (float) System.Math.Log(RDSlopesRates[sidx + 1]);
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_ab = (float) System.Math.Log(lastLayer.actualBytes);
			}
			
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			log_sl1 = (float) System.Math.Log(getSlopeFromSIndex(sidx));
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			log_sl2 = (float) System.Math.Log(getSlopeFromSIndex(sidx + 1));
			
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			log_isl = (float) System.Math.Log(lthresh);
			
			log_ilen = log_len1 + (log_isl - log_sl1) * (log_len1 - log_len2) / (log_sl1 - log_sl2);
			
			log_off = log_ab - log_ilen;
			
			// Do not use negative offsets (i.e. offset proportion larger than 1)
			// since that is probably a sign that our model is off. To be
			// conservative use an offset of 0 (i.e. offset proportiojn 1).
			if (log_off < 0)
				log_off = 0f;
			
			// 2) Correct the target layer length by the offset.
			
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			tlen = (int) (targetBytes / (float) System.Math.Exp(log_off));
			
			// 3) Find, from the summary R-D info, the thresholds that generate
			// lengths just above and below our corrected target layer length.
			
			// Look for the index in the summary info array that gives the largest 
			// length smaller than the target length
			for (sidx = RD_SUMMARY_SIZE - 1; sidx >= 0; sidx--)
			{
				if (RDSlopesRates[sidx] >= tlen)
					break;
			}
			sidx++;
			// Correct if out of the array
			if (sidx >= RD_SUMMARY_SIZE)
				sidx = RD_SUMMARY_SIZE - 1;
			if (sidx <= 0)
				sidx = 1;
			
			// Get the log of the lengths and the slopes that are just above and
			// below the target length.
			
			if (RDSlopesRates[sidx] == 0)
			{
				// Pathological case, we can not use log of 0. Add
				// RDSlopesRates[sidx-1]+1 bytes to the rates (just a crude simple 
				// solution to this rare case)
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_len1 = (float) System.Math.Log(RDSlopesRates[sidx - 1] + 1);
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_len2 = (float) System.Math.Log((RDSlopesRates[sidx - 1] << 1) + 1);
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_ilen = (float) System.Math.Log(tlen + RDSlopesRates[sidx - 1] + 1);
			}
			else
			{
				// Normal case, we can safely take the logs.
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_len1 = (float) System.Math.Log(RDSlopesRates[sidx]);
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_len2 = (float) System.Math.Log(RDSlopesRates[sidx - 1]);
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				log_ilen = (float) System.Math.Log(tlen);
			}
			
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			log_sl1 = (float) System.Math.Log(getSlopeFromSIndex(sidx));
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			log_sl2 = (float) System.Math.Log(getSlopeFromSIndex(sidx - 1));
			
			// 4) Interpolate the two thresholds to find the target threshold.
			
			log_isl = log_sl1 + (log_ilen - log_len1) * (log_sl1 - log_sl2) / (log_len1 - log_len2);
			
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			eth = (float) System.Math.Exp(log_isl);
			
			// Correct out of bounds results
			if (eth > lthresh)
				eth = lthresh;
			if (eth < FLOAT_ABS_PRECISION)
				eth = 0f;
			
			// Return the estimated threshold
			return eth;
		}
		
		/// <summary> This function finds the new truncation points indices for a packet. It
		/// does so by including the data from the code-blocks in the component,
		/// resolution level and tile, associated with a R-D slope which is larger
		/// than or equal to 'fthresh'.
		/// 
		/// </summary>
		/// <param name="layerIdx">The index of the current layer
		/// 
		/// </param>
		/// <param name="compIdx">The index of the current component
		/// 
		/// </param>
		/// <param name="lvlIdx">The index of the current resolution level
		/// 
		/// </param>
		/// <param name="tileIdx">The index of the current tile
		/// 
		/// </param>
		/// <param name="subb">The LL subband in the resolution level lvlIdx, which is
		/// parent of all the subbands in the packet. Except for resolution level 0
		/// this subband is always a node.
		/// 
		/// </param>
		/// <param name="fthresh">The value of the rate-distortion threshold
		/// 
		/// </param>
		private void  findTruncIndices(int layerIdx, int compIdx, int lvlIdx, int tileIdx, SubbandAn subb, float fthresh, int precinctIdx)
		{
			int minsbi, maxsbi, b, n; // bIdx removed
			//Coord ncblks = null;
			SubbandAn sb;
			CBlkRateDistStats cur_cblk;
			PrecInfo prec = pktEnc.getPrecInfo(tileIdx, compIdx, lvlIdx, precinctIdx);
			Coord cbCoord;
			
			sb = subb;
			while (sb.subb_HH != null)
			{
				sb = sb.subb_HH;
			}
			minsbi = (lvlIdx == 0)?0:1;
			maxsbi = (lvlIdx == 0)?1:4;
			
			int yend, xend;
			
			sb = (SubbandAn) subb.getSubbandByIdx(lvlIdx, minsbi);
			for (int s = minsbi; s < maxsbi; s++)
			{
				//loop on subbands
				yend = (prec.cblk[s] != null)?prec.cblk[s].Length:0;
				for (int y = 0; y < yend; y++)
				{
					xend = (prec.cblk[s][y] != null)?prec.cblk[s][y].Length:0;
					for (int x = 0; x < xend; x++)
					{
						cbCoord = prec.cblk[s][y][x].idx;
						b = cbCoord.x + cbCoord.y * sb.numCb.x;
						
						//Get the current code-block
						cur_cblk = cblks[tileIdx][compIdx][lvlIdx][s][b];
						for (n = 0; n < cur_cblk.nVldTrunc; n++)
						{
							if (cur_cblk.truncSlopes[n] < fthresh)
							{
								break;
							}
							else
							{
								continue;
							}
						}
						// Store the index in the code-block truncIdxs that gives
						// the real truncation index.
						truncIdxs[tileIdx][layerIdx][compIdx][lvlIdx][s][b] = n - 1;
					} // End loop on horizontal code-blocks
				} // End loop on vertical code-blocks
				sb = (SubbandAn) sb.nextSubband();
			} // End loop on subbands
		}
		
		/// <summary> Returns the index of a slope for the summary table, limiting to the
		/// admissible values. The index is calculated as RD_SUMMARY_OFF plus the
		/// maximum exponent, base 2, that yields a value not larger than the slope
		/// itself.
		/// 
		/// <p>If the value to return is lower than 0, 0 is returned. If it is
		/// larger than the maximum table index, then the maximum is returned.</p>
		/// 
		/// </summary>
		/// <param name="slope">The slope value
		/// 
		/// </param>
		/// <returns> The index for the summary table of the slope.
		/// 
		/// </returns>
		private static int getLimitedSIndexFromSlope(float slope)
		{
			int idx;
			
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			idx = (int) System.Math.Floor(System.Math.Log(slope) / LOG2) + RD_SUMMARY_OFF;
			
			if (idx < 0)
			{
				return 0;
			}
			else if (idx >= RD_SUMMARY_SIZE)
			{
				return RD_SUMMARY_SIZE - 1;
			}
			else
			{
				return idx;
			}
		}
		
		/// <summary> Returns the minimum slope value associated with a summary table
		/// index. This minimum slope is just 2^(index-RD_SUMMARY_OFF).
		/// 
		/// </summary>
		/// <param name="index">The summary index value.
		/// 
		/// </param>
		/// <returns> The minimum slope value associated with a summary table index.
		/// 
		/// </returns>
		private static float getSlopeFromSIndex(int index)
		{
			//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
			return (float) System.Math.Pow(2, (index - RD_SUMMARY_OFF));
		}
	}
}