corrade-vassal – Rev 1
?pathlinks?
/*
* CVS identifier:
*
* $Id: FileCodestreamWriter.java,v 1.15 2001/09/14 09:29:22 grosbois Exp $
*
* Class: FileCodestreamWriter
*
* Description: Implementation of the bit stream writer for streams.
*
*
*
* 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;
namespace CSJ2K.j2k.codestream.writer
{
/// <summary> This class implements a CodestreamWriter for Java streams. The streams can
/// be files or network connections, or any other resource that presents itself
/// as a OutputStream. See the CodestreamWriter abstract class for more details
/// on the implementation of the CodestreamWriter abstract class.
///
/// <p>Before any packet data is written to the bit stream (even in simulation
/// mode) the complete header should be written otherwise incorrect estimates
/// are given by getMaxAvailableBytes() for rate allocation.
///
/// </summary>
/// <seealso cref="CodestreamWriter">
///
/// </seealso>
public class FileCodestreamWriter:CodestreamWriter
{
/// <summary> Returns the number of bytes remaining available in the bit stream. This
/// is the maximum allowed number of bytes minus the number of bytes that
/// have already been written to the bit stream. If more bytes have been
/// written to the bit stream than the maximum number of allowed bytes,
/// then a negative value is returned.
///
/// </summary>
/// <returns> The number of bytes remaining available in the bit stream.
///
/// </returns>
override public int MaxAvailableBytes
{
get
{
return maxBytes - ndata;
}
}
/// <summary> Returns the current length of the entire bit stream.
///
/// </summary>
/// <returns> the current length of the bit stream
///
/// </returns>
override public int Length
{
get
{
if (MaxAvailableBytes >= 0)
{
return ndata;
}
else
{
return maxBytes;
}
}
}
/// <summary> Gives the offset of the end of last packet containing ROI information
///
/// </summary>
/// <returns> End of last ROI packet
///
/// </returns>
override public int OffLastROIPkt
{
get
{
return offLastROIPkt;
}
}
/// <summary>The upper limit for the value of the Nsop field of the SOP marker </summary>
private const int SOP_MARKER_LIMIT = 65535;
/// <summary>Index of the current tile </summary>
//private int tileIdx = 0;
/// <summary>The file to write </summary>
private System.IO.Stream out_Renamed;
/// <summary>The number of bytes already written to the codestream, excluding the
/// header length, magic number and header length info.
/// </summary>
new internal int ndata = 0;
/// <summary>The default buffer length, 1024 bytes </summary>
public static int DEF_BUF_LEN = 1024;
/// <summary>Array used to store the SOP markers values </summary>
internal byte[] sopMarker;
/// <summary>Array used to store the EPH markers values </summary>
internal byte[] ephMarker;
/// <summary>The packet index (when start of packet markers i.e. SOP markers) are
/// used.
/// </summary>
internal int packetIdx = 0;
/// <summary>Offset of end of last packet containing ROI information </summary>
private int offLastROIPkt = 0;
/// <summary>Length of last packets containing no ROI information </summary>
private int lenLastNoROI = 0;
/// <summary> Opens the file 'file' for writing the codestream. The magic number is
/// written to the bit stream. Normally, the header encoder must be empty
/// (i.e. no data has been written to it yet). A BufferedOutputStream is
/// used on top of the file to increase throughput, the length of the
/// buffer is DEF_BUF_LEN.
///
/// </summary>
/// <param name="file">The file where to write the bit stream
///
/// </param>
/// <param name="mb">The maximum number of bytes that can be written to the bit
/// stream.
///
/// </param>
/// <exception cref="IOException">If an error occurs while trying to open the file
/// for writing or while writing the magic number.
///
/// </exception>
public FileCodestreamWriter(System.IO.FileInfo file, int mb):base(mb)
{
//UPGRADE_TODO: Constructor 'java.io.FileOutputStream.FileOutputStream' was converted to 'System.IO.FileStream.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioFileOutputStreamFileOutputStream_javaioFile'"
out_Renamed = new System.IO.BufferedStream(new System.IO.FileStream(file.FullName, System.IO.FileMode.Create), DEF_BUF_LEN);
initSOP_EPHArrays();
}
/// <summary> Opens the file named 'fname' for writing the bit stream, using the 'he'
/// header encoder. The magic number is written to the bit
/// stream. Normally, the header encoder must be empty (i.e. no data has
/// been written to it yet). A BufferedOutputStream is used on top of the
/// file to increase throughput, the length of the buffer is DEF_BUF_LEN.
///
/// </summary>
/// <param name="fname">The name of file where to write the bit stream
///
/// </param>
/// <param name="mb">The maximum number of bytes that can be written to the bit
/// stream.
///
/// </param>
/// <param name="encSpec">The encoder's specifications
///
/// </param>
/// <exception cref="IOException">If an error occurs while trying to open the file
/// for writing or while writing the magic number.
///
/// </exception>
public FileCodestreamWriter(System.String fname, int mb):base(mb)
{
//UPGRADE_TODO: Constructor 'java.io.FileOutputStream.FileOutputStream' was converted to 'System.IO.FileStream.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioFileOutputStreamFileOutputStream_javalangString'"
out_Renamed = new System.IO.BufferedStream(new System.IO.FileStream(fname, System.IO.FileMode.Create), DEF_BUF_LEN);
initSOP_EPHArrays();
}
/// <summary> Uses the output stream 'os' for writing the bit stream, using the 'he'
/// header encoder. The magic number is written to the bit
/// stream. Normally, the header encoder must be empty (i.e. no data has
/// been written to it yet). No BufferedOutputStream is used on top of the
/// output stream 'os'.
///
/// </summary>
/// <param name="os">The output stream where to write the bit stream.
///
/// </param>
/// <param name="mb">The maximum number of bytes that can be written to the bit
/// stream.
///
/// </param>
/// <exception cref="IOException">If an error occurs while writing the magic
/// number to the 'os' output stream.
///
/// </exception>
public FileCodestreamWriter(System.IO.Stream os, int mb):base(mb)
{
out_Renamed = os;
initSOP_EPHArrays();
}
/// <summary> Writes a packet head to the bit stream and returns the number of bytes
/// used by this header. It returns the total number of bytes that the
/// packet head takes in the bit stream. If in simulation mode then no data
/// is written to the bit stream but the number of bytes is
/// calculated. This can be used for iterative rate allocation.
///
/// <P>If the length of the data that is to be written to the bit stream is
/// more than the space left (as returned by getMaxAvailableBytes()) only
/// the data that does not exceed the allowed length is written, the rest
/// is discarded. However the value returned by the method is the total
/// length of the packet, as if all of it was written to the bit stream.
///
/// <P>If the bit stream header has not been commited yet and 'sim' is
/// false, then the bit stream header is automatically commited (see
/// commitBitstreamHeader() method) before writting the packet.
///
/// </summary>
/// <param name="head">The packet head data.
///
/// </param>
/// <param name="hlen">The number of bytes in the packet head.
///
/// </param>
/// <param name="sim">Simulation mode flag. If true nothing is written to the bit
/// stream, but the number of bytes that would be written is returned.
///
/// </param>
/// <param name="sop">Start of packet header marker flag. This flag indicates
/// whether or not SOP markers should be written. If true, SOP markers
/// should be written, if false, they should not.
///
/// </param>
/// <param name="eph">End of Packet Header marker flag. This flag indicates
/// whether or not EPH markers should be written. If true, EPH markers
/// should be written, if false, they should not.
///
/// </param>
/// <returns> The number of bytes spent by the packet head.
///
/// </returns>
/// <exception cref="IOException">If an I/O error occurs while writing to the
/// output stream.
///
/// </exception>
/// <seealso cref="commitBitstreamHeader">
///
/// </seealso>
public override int writePacketHead(byte[] head, int hlen, bool sim, bool sop, bool eph)
{
// CONVERSION PROBLEM?
int len = hlen + (sop ? (int)CSJ2K.j2k.codestream.Markers.SOP_LENGTH : 0) + (eph ? (int)CSJ2K.j2k.codestream.Markers.EPH_LENGTH : 0);
// If not in simulation mode write the data
if (!sim)
{
// Write the head bytes
if (MaxAvailableBytes < len)
{
len = MaxAvailableBytes;
}
if (len > 0)
{
// Write Start Of Packet header markers if necessary
if (sop)
{
// The first 4 bytes of the array have been filled in the
// classe's constructor.
sopMarker[4] = (byte) (packetIdx >> 8);
sopMarker[5] = (byte) (packetIdx);
out_Renamed.Write(sopMarker, 0, CSJ2K.j2k.codestream.Markers.SOP_LENGTH);
packetIdx++;
if (packetIdx > SOP_MARKER_LIMIT)
{
// Reset SOP value as we have reached its upper limit
packetIdx = 0;
}
}
out_Renamed.Write(head, 0, hlen);
// Update data length
ndata += len;
// Write End of Packet Header markers if necessary
if (eph)
{
out_Renamed.Write(ephMarker, 0, CSJ2K.j2k.codestream.Markers.EPH_LENGTH);
}
// Deal with ROI Information
lenLastNoROI += len;
}
}
return len;
}
/// <summary> Writes a packet body to the bit stream and returns the number of bytes
/// used by this body .If in simulation mode then no data is written to the
/// bit stream but the number of bytes is calculated. This can be used for
/// iterative rate allocation.
///
/// <P>If the length of the data that is to be written to the bit stream is
/// more than the space left (as returned by getMaxAvailableBytes()) only
/// the data that does not exceed the allowed length is written, the rest
/// is discarded. However the value returned by the method is the total
/// length of the packet body , as if all of it was written to the bit
/// stream.
///
/// </summary>
/// <param name="body">The packet body data.
///
/// </param>
/// <param name="blen">The number of bytes in the packet body.
///
/// </param>
/// <param name="sim">Simulation mode flag. If true nothing is written to the bit
/// stream, but the number of bytes that would be written is returned.
///
/// </param>
/// <param name="roiInPkt">Whether or not this packet contains ROI information
///
/// </param>
/// <param name="roiLen">Number of byte to read in packet body to get all the ROI
/// information
///
/// </param>
/// <returns> The number of bytes spent by the packet body.
///
/// </returns>
/// <exception cref="IOException">If an I/O error occurs while writing to the
/// output stream.
///
/// </exception>
/// <seealso cref="commitBitstreamHeader">
///
/// </seealso>
public override int writePacketBody(byte[] body, int blen, bool sim, bool roiInPkt, int roiLen)
{
int len = blen;
// If not in simulation mode write the data
if (!sim)
{
// Write the body bytes
len = blen;
if (MaxAvailableBytes < len)
{
len = MaxAvailableBytes;
}
if (blen > 0)
{
out_Renamed.Write(body, 0, len);
}
// Update data length
ndata += len;
// Deal with ROI information
if (roiInPkt)
{
offLastROIPkt += lenLastNoROI + roiLen;
lenLastNoROI = len - roiLen;
}
else
{
lenLastNoROI += len;
}
}
return len;
}
/// <summary> Writes the EOC marker and closes the underlying stream.
///
/// </summary>
/// <exception cref="IOException">If an error occurs while closing the underlying
/// stream.
///
/// </exception>
public override void close()
{
// Write the EOC marker and close the codestream.
// CONVERSION PROBLEM?
out_Renamed.WriteByte((byte) SupportClass.URShift(CSJ2K.j2k.codestream.Markers.EOC, 8));
out_Renamed.WriteByte((byte) (CSJ2K.j2k.codestream.Markers.EOC & 0x00FF));
ndata += 2; // Add two to length of codestream for EOC marker
out_Renamed.Close();
}
/// <summary> Writes the header data in the codestream and actualize ndata with the
/// header length. The header is either a MainHeaderEncoder or a
/// TileHeaderEncoder.
///
/// </summary>
/// <param name="he">The current header encoder.
///
/// </param>
/// <exception cref="IOException">If an I/O error occurs while writing the data.
///
/// </exception>
public override void commitBitstreamHeader(HeaderEncoder he)
{
// Actualize ndata
ndata += he.Length;
he.writeTo(out_Renamed); // Write the header
// Reset packet index used for SOP markers
packetIdx = 0;
// Deal with ROI information
lenLastNoROI += he.Length;
}
/// <summary> Performs the initialisation of the arrays that are used to store the
/// values used to write SOP and EPH markers
///
/// </summary>
private void initSOP_EPHArrays()
{
// Allocate and set first values of SOP marker as they will not be
// modified
sopMarker = new byte[CSJ2K.j2k.codestream.Markers.SOP_LENGTH];
sopMarker[0] = unchecked((byte) (CSJ2K.j2k.codestream.Markers.SOP >> 8));
sopMarker[1] = (byte) SupportClass.Identity(CSJ2K.j2k.codestream.Markers.SOP);
sopMarker[2] = (byte) 0x00;
sopMarker[3] = (byte) 0x04;
// Allocate and set values of EPH marker as they will not be
// modified
ephMarker = new byte[CSJ2K.j2k.codestream.Markers.EPH_LENGTH];
ephMarker[0] = unchecked((byte) (CSJ2K.j2k.codestream.Markers.EPH >> 8));
ephMarker[1] = (byte) SupportClass.Identity(CSJ2K.j2k.codestream.Markers.EPH);
}
}
}
Generated by GNU Enscript 1.6.5.90.