[llvm-commits] CVS: llvm-test/MultiSource/Benchmarks/mediabench/jpeg/LICENSE.TXT Makefile README
Dinakar Dhurjati
dhurjati at cs.uiuc.edu
Tue Jan 11 10:05:48 PST 2005
Changes in directory llvm-test/MultiSource/Benchmarks/mediabench/jpeg:
LICENSE.TXT added (r1.1)
Makefile added (r1.1)
README added (r1.1)
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Log message:
Added media bench to llvm-test
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Diffs of the changes: (+399 -0)
Index: llvm-test/MultiSource/Benchmarks/mediabench/jpeg/LICENSE.TXT
diff -c /dev/null llvm-test/MultiSource/Benchmarks/mediabench/jpeg/LICENSE.TXT:1.1
*** /dev/null Tue Jan 11 12:05:47 2005
--- llvm-test/MultiSource/Benchmarks/mediabench/jpeg/LICENSE.TXT Tue Jan 11 12:05:06 2005
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*** 0 ****
--- 1,9 ----
+ jpeg - Part of the mediabench Benchmark Suite
+ -------------------------------------------------------------------------------
+ All files are licensed under the LLVM license with the following additions:
+
+ Please see individiual files for additional copyright information.
+ Redistribution must follow the additional restrictions required by the
+ individual files.
+
+
Index: llvm-test/MultiSource/Benchmarks/mediabench/jpeg/Makefile
diff -c /dev/null llvm-test/MultiSource/Benchmarks/mediabench/jpeg/Makefile:1.1
*** /dev/null Tue Jan 11 12:05:48 2005
--- llvm-test/MultiSource/Benchmarks/mediabench/jpeg/Makefile Tue Jan 11 12:05:06 2005
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--- 1,7 ----
+ #MultiSource/mediabench/jpeg Makefile: Build all subdirectories automatically
+
+ LEVEL = ../../../..
+ PARALLEL_DIRS := jpeg-6a
+ #unepic
+
+ include $(LEVEL)/Makefile.programs
Index: llvm-test/MultiSource/Benchmarks/mediabench/jpeg/README
diff -c /dev/null llvm-test/MultiSource/Benchmarks/mediabench/jpeg/README:1.1
*** /dev/null Tue Jan 11 12:05:48 2005
--- llvm-test/MultiSource/Benchmarks/mediabench/jpeg/README Tue Jan 11 12:05:06 2005
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--- 1,383 ----
+ The Independent JPEG Group's JPEG software
+ ==========================================
+
+ README for release 6a of 7-Feb-96
+ =================================
+
+ This distribution contains the sixth public release of the Independent JPEG
+ Group's free JPEG software. You are welcome to redistribute this software and
+ to use it for any purpose, subject to the conditions under LEGAL ISSUES, below.
+
+ Serious users of this software (particularly those incorporating it into
+ larger programs) should contact IJG at jpeg-info at uunet.uu.net to be added to
+ our electronic mailing list. Mailing list members are notified of updates
+ and have a chance to participate in technical discussions, etc.
+
+ This software is the work of Tom Lane, Philip Gladstone, Luis Ortiz, Jim
+ Boucher, Lee Crocker, Julian Minguillon, George Phillips, Davide Rossi,
+ Ge' Weijers, and other members of the Independent JPEG Group.
+
+ IJG is not affiliated with the official ISO JPEG standards committee.
+
+
+ DOCUMENTATION ROADMAP
+ =====================
+
+ This file contains the following sections:
+
+ OVERVIEW General description of JPEG and the IJG software.
+ LEGAL ISSUES Copyright, lack of warranty, terms of distribution.
+ REFERENCES Where to learn more about JPEG.
+ ARCHIVE LOCATIONS Where to find newer versions of this software.
+ RELATED SOFTWARE Other stuff you should get.
+ FILE FORMAT WARS Software *not* to get.
+ TO DO Plans for future IJG releases.
+
+ Other documentation files in the distribution are:
+
+ User documentation:
+ install.doc How to configure and install the IJG software.
+ usage.doc Usage instructions for cjpeg, djpeg, jpegtran,
+ rdjpgcom, and wrjpgcom.
+ *.1 Unix-style man pages for programs (same info as usage.doc).
+ wizard.doc Advanced usage instructions for JPEG wizards only.
+ change.log Version-to-version change highlights.
+ Programmer and internal documentation:
+ libjpeg.doc How to use the JPEG library in your own programs.
+ example.c Sample code for calling the JPEG library.
+ structure.doc Overview of the JPEG library's internal structure.
+ filelist.doc Road map of IJG files.
+ coderules.doc Coding style rules --- please read if you contribute code.
+
+ Please read at least the files install.doc and usage.doc. Useful information
+ can also be found in the JPEG FAQ (Frequently Asked Questions) article. See
+ ARCHIVE LOCATIONS below to find out where to obtain the FAQ article.
+
+ If you want to understand how the JPEG code works, we suggest reading one or
+ more of the REFERENCES, then looking at the documentation files (in roughly
+ the order listed) before diving into the code.
+
+
+ OVERVIEW
+ ========
+
+ This package contains C software to implement JPEG image compression and
+ decompression. JPEG (pronounced "jay-peg") is a standardized compression
+ method for full-color and gray-scale images. JPEG is intended for compressing
+ "real-world" scenes; line drawings, cartoons and other non-realistic images
+ are not its strong suit. JPEG is lossy, meaning that the output image is not
+ exactly identical to the input image. Hence you must not use JPEG if you
+ have to have identical output bits. However, on typical photographic images,
+ very good compression levels can be obtained with no visible change, and
+ remarkably high compression levels are possible if you can tolerate a
+ low-quality image. For more details, see the references, or just experiment
+ with various compression settings.
+
+ This software implements JPEG baseline, extended-sequential, and progressive
+ compression processes. Provision is made for supporting all variants of these
+ processes, although some uncommon parameter settings aren't implemented yet.
+ For legal reasons, we are not distributing code for the arithmetic-coding
+ variants of JPEG; see LEGAL ISSUES. We have made no provision for supporting
+ the hierarchical or lossless processes defined in the standard.
+
+ We provide a set of library routines for reading and writing JPEG image files,
+ plus two sample applications "cjpeg" and "djpeg", which use the library to
+ perform conversion between JPEG and some other popular image file formats.
+ The library is intended to be reused in other applications.
+
+ In order to support file conversion and viewing software, we have included
+ considerable functionality beyond the bare JPEG coding/decoding capability;
+ for example, the color quantization modules are not strictly part of JPEG
+ decoding, but they are essential for output to colormapped file formats or
+ colormapped displays. These extra functions can be compiled out of the
+ library if not required for a particular application. We have also included
+ "jpegtran", a utility for lossless transcoding between different JPEG
+ processes, and "rdjpgcom" and "wrjpgcom", two simple applications for
+ inserting and extracting textual comments in JFIF files.
+
+ The emphasis in designing this software has been on achieving portability and
+ flexibility, while also making it fast enough to be useful. In particular,
+ the software is not intended to be read as a tutorial on JPEG. (See the
+ REFERENCES section for introductory material.) Rather, it is intended to
+ be reliable, portable, industrial-strength code. We do not claim to have
+ achieved that goal in every aspect of the software, but we strive for it.
+
+ We welcome the use of this software as a component of commercial products.
+ No royalty is required, but we do ask for an acknowledgement in product
+ documentation, as described under LEGAL ISSUES.
+
+
+ LEGAL ISSUES
+ ============
+
+ In plain English:
+
+ 1. We don't promise that this software works. (But if you find any bugs,
+ please let us know!)
+ 2. You can use this software for whatever you want. You don't have to pay us.
+ 3. You may not pretend that you wrote this software. If you use it in a
+ program, you must acknowledge somewhere in your documentation that
+ you've used the IJG code.
+
+ In legalese:
+
+ The authors make NO WARRANTY or representation, either express or implied,
+ with respect to this software, its quality, accuracy, merchantability, or
+ fitness for a particular purpose. This software is provided "AS IS", and you,
+ its user, assume the entire risk as to its quality and accuracy.
+
+ This software is copyright (C) 1991-1996, Thomas G. Lane.
+ All Rights Reserved except as specified below.
+
+ Permission is hereby granted to use, copy, modify, and distribute this
+ software (or portions thereof) for any purpose, without fee, subject to these
+ conditions:
+ (1) If any part of the source code for this software is distributed, then this
+ README file must be included, with this copyright and no-warranty notice
+ unaltered; and any additions, deletions, or changes to the original files
+ must be clearly indicated in accompanying documentation.
+ (2) If only executable code is distributed, then the accompanying
+ documentation must state that "this software is based in part on the work of
+ the Independent JPEG Group".
+ (3) Permission for use of this software is granted only if the user accepts
+ full responsibility for any undesirable consequences; the authors accept
+ NO LIABILITY for damages of any kind.
+
+ These conditions apply to any software derived from or based on the IJG code,
+ not just to the unmodified library. If you use our work, you ought to
+ acknowledge us.
+
+ Permission is NOT granted for the use of any IJG author's name or company name
+ in advertising or publicity relating to this software or products derived from
+ it. This software may be referred to only as "the Independent JPEG Group's
+ software".
+
+ We specifically permit and encourage the use of this software as the basis of
+ commercial products, provided that all warranty or liability claims are
+ assumed by the product vendor.
+
+
+ ansi2knr.c is included in this distribution by permission of L. Peter Deutsch,
+ sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA.
+ ansi2knr.c is NOT covered by the above copyright and conditions, but instead
+ by the usual distribution terms of the Free Software Foundation; principally,
+ that you must include source code if you redistribute it. (See the file
+ ansi2knr.c for full details.) However, since ansi2knr.c is not needed as part
+ of any program generated from the IJG code, this does not limit you more than
+ the foregoing paragraphs do.
+
+ The configuration script "configure" was produced with GNU Autoconf. It
+ is copyright by the Free Software Foundation but is freely distributable.
+
+ It appears that the arithmetic coding option of the JPEG spec is covered by
+ patents owned by IBM, AT&T, and Mitsubishi. Hence arithmetic coding cannot
+ legally be used without obtaining one or more licenses. For this reason,
+ support for arithmetic coding has been removed from the free JPEG software.
+ (Since arithmetic coding provides only a marginal gain over the unpatented
+ Huffman mode, it is unlikely that very many implementations will support it.)
+ So far as we are aware, there are no patent restrictions on the remaining
+ code.
+
+ WARNING: Unisys has begun to enforce their patent on LZW compression against
+ GIF encoders and decoders. You will need a license from Unisys to use the
+ included rdgif.c or wrgif.c files in a commercial or shareware application.
+ At this time, Unisys is not enforcing their patent against freeware, so
+ distribution of this package remains legal. However, we intend to remove
+ GIF support from the IJG package as soon as a suitable replacement format
+ becomes reasonably popular.
+
+ We are required to state that
+ "The Graphics Interchange Format(c) is the Copyright property of
+ CompuServe Incorporated. GIF(sm) is a Service Mark property of
+ CompuServe Incorporated."
+
+
+ REFERENCES
+ ==========
+
+ We highly recommend reading one or more of these references before trying to
+ understand the innards of the JPEG software.
+
+ The best short technical introduction to the JPEG compression algorithm is
+ Wallace, Gregory K. "The JPEG Still Picture Compression Standard",
+ Communications of the ACM, April 1991 (vol. 34 no. 4), pp. 30-44.
+ (Adjacent articles in that issue discuss MPEG motion picture compression,
+ applications of JPEG, and related topics.) If you don't have the CACM issue
+ handy, a PostScript file containing a revised version of Wallace's article
+ is available at ftp.uu.net, graphics/jpeg/wallace.ps.gz. The file (actually
+ a preprint for an article that appeared in IEEE Trans. Consumer Electronics)
+ omits the sample images that appeared in CACM, but it includes corrections
+ and some added material. Note: the Wallace article is copyright ACM and
+ IEEE, and it may not be used for commercial purposes.
+
+ A somewhat less technical, more leisurely introduction to JPEG can be found in
+ "The Data Compression Book" by Mark Nelson, published by M&T Books (Redwood
+ City, CA), 1991, ISBN 1-55851-216-0. This book provides good explanations and
+ example C code for a multitude of compression methods including JPEG. It is
+ an excellent source if you are comfortable reading C code but don't know much
+ about data compression in general. The book's JPEG sample code is far from
+ industrial-strength, but when you are ready to look at a full implementation,
+ you've got one here...
+
+ The best full description of JPEG is the textbook "JPEG Still Image Data
+ Compression Standard" by William B. Pennebaker and Joan L. Mitchell, published
+ by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1. Price US$59.95, 638 pp.
+ The book includes the complete text of the ISO JPEG standards (DIS 10918-1
+ and draft DIS 10918-2). This is by far the most complete exposition of JPEG
+ in existence, and we highly recommend it.
+
+ The JPEG standard itself is not available electronically; you must order a
+ paper copy through ISO or ITU. (Unless you feel a need to own a certified
+ official copy, we recommend buying the Pennebaker and Mitchell book instead;
+ it's much cheaper and includes a great deal of useful explanatory material.)
+ In the USA, copies of the standard may be ordered from ANSI Sales at (212)
+ 642-4900, or from Global Engineering Documents at (800) 854-7179. (ANSI
+ doesn't take credit card orders, but Global does.) It's not cheap: as of
+ 1992, ANSI was charging $95 for Part 1 and $47 for Part 2, plus 7%
+ shipping/handling. The standard is divided into two parts, Part 1 being the
+ actual specification, while Part 2 covers compliance testing methods. Part 1
+ is titled "Digital Compression and Coding of Continuous-tone Still Images,
+ Part 1: Requirements and guidelines" and has document numbers ISO/IEC IS
+ 10918-1, ITU-T T.81. Part 2 is titled "Digital Compression and Coding of
+ Continuous-tone Still Images, Part 2: Compliance testing" and has document
+ numbers ISO/IEC IS 10918-2, ITU-T T.83.
+
+ Extensions to the original JPEG standard are defined in JPEG Part 3, a new ISO
+ document. Part 3 is undergoing ISO balloting and is expected to be approved
+ by the end of 1995; it will have document numbers ISO/IEC IS 10918-3, ITU-T
+ T.84. IJG currently does not support any Part 3 extensions.
+
+ The JPEG standard does not specify all details of an interchangeable file
+ format. For the omitted details we follow the "JFIF" conventions, revision
+ 1.02. A copy of the JFIF spec is available from:
+ Literature Department
+ C-Cube Microsystems, Inc.
+ 1778 McCarthy Blvd.
+ Milpitas, CA 95035
+ phone (408) 944-6300, fax (408) 944-6314
+ A PostScript version of this document is available at ftp.uu.net, file
+ graphics/jpeg/jfif.ps.gz. It can also be obtained by e-mail from the C-Cube
+ mail server, netlib at c3.pla.ca.us. Send the message "send jfif_ps from jpeg"
+ to the server to obtain the JFIF document; send the message "help" if you have
+ trouble.
+
+ The TIFF 6.0 file format specification can be obtained by FTP from sgi.com
+ (192.48.153.1), file graphics/tiff/TIFF6.ps.Z; or you can order a printed
+ copy from Aldus Corp. at (206) 628-6593. The JPEG incorporation scheme
+ found in the TIFF 6.0 spec of 3-June-92 has a number of serious problems.
+ IJG does not recommend use of the TIFF 6.0 design (TIFF Compression tag 6).
+ Instead, we recommend the JPEG design proposed by TIFF Technical Note #2
+ (Compression tag 7). Copies of this Note can be obtained from sgi.com or
+ from ftp.uu.net:/graphics/jpeg/. It is expected that the next revision of
+ the TIFF spec will replace the 6.0 JPEG design with the Note's design.
+ Although IJG's own code does not support TIFF/JPEG, the free libtiff library
+ uses our library to implement TIFF/JPEG per the Note. libtiff is available
+ from sgi.com:/graphics/tiff/.
+
+
+ ARCHIVE LOCATIONS
+ =================
+
+ The "official" archive site for this software is ftp.uu.net (Internet
+ address 192.48.96.9). The most recent released version can always be found
+ there in directory graphics/jpeg. This particular version will be archived
+ as graphics/jpeg/jpegsrc.v6a.tar.gz. If you are on the Internet, you
+ can retrieve files from ftp.uu.net by standard anonymous FTP. If you don't
+ have FTP access, UUNET's archives are also available via UUCP; contact
+ help at uunet.uu.net for information on retrieving files that way.
+
+ Numerous Internet sites maintain copies of the UUNET files. However, only
+ ftp.uu.net is guaranteed to have the latest official version.
+
+ You can also obtain this software in DOS-compatible "zip" archive format from
+ the SimTel archives (ftp.coast.net:/SimTel/msdos/graphics/), or on CompuServe
+ in the Graphics Support forum (GO CIS:GRAPHSUP), library 12 "JPEG Tools".
+ Again, these versions may sometimes lag behind the ftp.uu.net release.
+
+ The JPEG FAQ (Frequently Asked Questions) article is a useful source of
+ general information about JPEG. It is updated constantly and therefore is
+ not included in this distribution. The FAQ is posted every two weeks to
+ Usenet newsgroups comp.graphics.misc, news.answers, and other groups.
+ You can always obtain the latest version from the news.answers archive at
+ rtfm.mit.edu. By FTP, fetch /pub/usenet/news.answers/jpeg-faq/part1 and
+ .../part2. If you don't have FTP, send e-mail to mail-server at rtfm.mit.edu
+ with body
+ send usenet/news.answers/jpeg-faq/part1
+ send usenet/news.answers/jpeg-faq/part2
+
+
+ RELATED SOFTWARE
+ ================
+
+ Numerous viewing and image manipulation programs now support JPEG. (Quite a
+ few of them use this library to do so.) The JPEG FAQ described above lists
+ some of the more popular free and shareware viewers, and tells where to
+ obtain them on Internet.
+
+ If you are on a Unix machine, we highly recommend Jef Poskanzer's free
+ PBMPLUS image software, which provides many useful operations on PPM-format
+ image files. In particular, it can convert PPM images to and from a wide
+ range of other formats. You can obtain this package by FTP from ftp.x.org
+ (contrib/pbmplus*.tar.Z) or ftp.ee.lbl.gov (pbmplus*.tar.Z). There is also
+ a newer update of this package called NETPBM, available from
+ wuarchive.wustl.edu under directory /graphics/graphics/packages/NetPBM/.
+ Unfortunately PBMPLUS/NETPBM is not nearly as portable as the IJG software
+ is; you are likely to have difficulty making it work on any non-Unix machine.
+
+ A different free JPEG implementation, written by the PVRG group at Stanford,
+ is available from havefun.stanford.edu in directory pub/jpeg. This program
+ is designed for research and experimentation rather than production use;
+ it is slower, harder to use, and less portable than the IJG code, but it
+ is easier to read and modify. Also, the PVRG code supports lossless JPEG,
+ which we do not.
+
+
+ FILE FORMAT WARS
+ ================
+
+ Some JPEG programs produce files that are not compatible with our library.
+ The root of the problem is that the ISO JPEG committee failed to specify a
+ concrete file format. Some vendors "filled in the blanks" on their own,
+ creating proprietary formats that no one else could read. (For example, none
+ of the early commercial JPEG implementations for the Macintosh were able to
+ exchange compressed files.)
+
+ The file format we have adopted is called JFIF (see REFERENCES). This format
+ has been agreed to by a number of major commercial JPEG vendors, and it has
+ become the de facto standard. JFIF is a minimal or "low end" representation.
+ We recommend the use of TIFF/JPEG (TIFF revision 6.0 as modified by TIFF
+ Technical Note #2) for "high end" applications that need to record a lot of
+ additional data about an image. TIFF/JPEG is fairly new and not yet widely
+ supported, unfortunately.
+
+ The upcoming JPEG Part 3 standard defines a file format called SPIFF.
+ SPIFF is interoperable with JFIF, in the sense that most JFIF decoders should
+ be able to read the most common variant of SPIFF. SPIFF has some technical
+ advantages over JFIF, but its major claim to fame is simply that it is an
+ official standard rather than an informal one. At this point it is unclear
+ whether SPIFF will supersede JFIF or whether JFIF will remain the de-facto
+ standard. IJG intends to support SPIFF once the standard is frozen, but we
+ have not decided whether it should become our default output format or not.
+ (In any case, our decoder will remain capable of reading JFIF indefinitely.)
+
+ Various proprietary file formats incorporating JPEG compression also exist.
+ We have little or no sympathy for the existence of these formats. Indeed,
+ one of the original reasons for developing this free software was to help
+ force convergence on common, open format standards for JPEG files. Don't
+ use a proprietary file format!
+
+
+ TO DO
+ =====
+
+ In future versions, we are considering supporting some of the upcoming JPEG
+ Part 3 extensions --- principally, variable quantization and the SPIFF file
+ format.
+
+ Tuning the software for better behavior at low quality/high compression
+ settings is also of interest. The current method for scaling the
+ quantization tables is known not to be very good at low Q values.
+
+ As always, speeding things up is high on our priority list.
+
+ Please send bug reports, offers of help, etc. to jpeg-info at uunet.uu.net.
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