mp3 encoder for virtual dj
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LAME MP3 Encoder 3.98.2
Today, LAME is considered the best MP3 encoder at mid-high bitrates and at VBR. more>> LAME development started around mid-1998. Mike Cheng started it as a patch against the 8hz-MP3 encoder sources. After some quality concerns raised by others, he decided to start from scratch based on the dist10 sources. His goal was only to speed up the dist10 sources, and leave its quality untouched. That branch (a patch against the reference sources) became Lame 2.0, and only on Lame 3.81 did we replaced of all dist10 code, making LAME no more only a patch.
The project quickly became a team project. Mike Cheng eventually left leadership and started working on tooLame, an MP2 encoder. Mark Taylor became leader and started pursuing increased quality in addition to better speed. He can be considered the initiator of the LAME project in its current form. He released version 3.0 featuring gpsycho, a new psychoacoustic model he developed.
In early 2003 Mark left project leadership, and since then the project has been lead through the cooperation of the active developers (currently 4 individuals).
Today, LAME is considered the best MP3 encoder at mid-high bitrates and at VBR, mostly thanks to the dedicated work of its developers and the open source licensing model that allowed the project to tap into engineering resources from all around the world. Both quality and speed improvements are still happening, probably making LAME the only MP3 encoder still being actively developed.<<less
Download (1.27MB)
Added: 2009-04-08 License: Freeware Price:
198 downloads
Other version of LAME MP3 Encoder
License:Freeware
Kool Virtual Decks 0.0.0b
Kool Virtual Decks project is a professional double CD player emulator like Virtual Turn Tables. more>>
Kool Virtual Decks project is a professional double CD player emulator like Virtual Turn Tables, BPM Studio or any other as you know.
The idea is that you can mix two songs like a DJ would make in his/her dual cd player or in his/her turntables.
Well this program is just a preview, and idea. It doesnt work yet.
If you want to join to this project or if you have any suggestion please e-mail me.
<<lessThe idea is that you can mix two songs like a DJ would make in his/her dual cd player or in his/her turntables.
Well this program is just a preview, and idea. It doesnt work yet.
If you want to join to this project or if you have any suggestion please e-mail me.
Download (0.26MB)
Added: 2006-10-09 License: GPL (GNU General Public License) Price:
1118 downloads
A MP3 LEnder 0.5.7
AMPLE is short for A MP3 LEnder. more>>
AMPLE is short for "A MP3 LEnder". I wrote AMPLE one summer when I was coding for a company and got fed up with having to FTP over all my MP3 files from my home server to the computer at work just to listen to them. And through the other "MP3 servers" I could find didnt fit my needs for one of the following reasons:
Depended on libfoo, libbar, python, perl, php3, Apache, libssl, etc, etc, etc...I just wanted to listen to the files
Had a lot of features for "DJ:ing" etc that I really didnt need. Well....it was fun to write too.
So whats good with AMPLE?
Small, standalone (written in C using no external libraries)
Portable (I think), I often try to compile it on the SourceForge compile farms
Allows you to listen to your own MP3s away from home, nothing more, nothing less
This is beginning to sound like marketing cr*p so Ill just stop right there, check out the links on the left for more info.
Enhancements:
- There are only two fixes in this release. One is a compilation fix for Solaris and the other one is a security fix. Turns out a buffer used for local communication didnt have sufficient checks. User data isnt written without checks though so the worst that can happen is that huge amounts of memory is allocated. The socket was also bound to the loopback device so it should only be locally abuseable.
<<lessDepended on libfoo, libbar, python, perl, php3, Apache, libssl, etc, etc, etc...I just wanted to listen to the files
Had a lot of features for "DJ:ing" etc that I really didnt need. Well....it was fun to write too.
So whats good with AMPLE?
Small, standalone (written in C using no external libraries)
Portable (I think), I often try to compile it on the SourceForge compile farms
Allows you to listen to your own MP3s away from home, nothing more, nothing less
This is beginning to sound like marketing cr*p so Ill just stop right there, check out the links on the left for more info.
Enhancements:
- There are only two fixes in this release. One is a compilation fix for Solaris and the other one is a security fix. Turns out a buffer used for local communication didnt have sufficient checks. User data isnt written without checks though so the worst that can happen is that huge amounts of memory is allocated. The socket was also bound to the loopback device so it should only be locally abuseable.
Download (0.085MB)
Added: 2006-07-27 License: GPL (GNU General Public License) Price:
1184 downloads
An MP3 LEnder 0.4.0
An MP3 LEnder is a simple MP3 server written in C. more>>
An MP3 LEnder is a simple MP3 server written in C.
AMPLE is short for "A MP3 LEnder" (interesting name just to make a good abbreviation?)
I wrote AMPLE one summer when I was coding for a company and got fed up with having to FTP over all my MP3 files from my home server to the computer at work just to listen to them. And the other "MP3 servers" I could find didnt fit my needs for one of the following reasons:
Depended on libfoo, libbar, python, perl, php3, Apache, libssl, etc, etc, etc...I just wanted to listen to the files
Had a lot of features for "DJ:ing" etc that I really didnt need
Well....it was fun to write too :)
So whats good with AMPLE?
Small, standalone (written in C using no external libraries)
Portable (I think), I often try to compile it on the SourceForge compile farms
Allows you to listen to your own MP3s away from home, nothing more, nothing less
This is beginning to sound like marketing cr*p so Ill just stop right there, check out the links on the left for more info.
Enhancements:
- Make ID3v2 code understand versions 2.2.0 -> 2.4.0 (all currently existing versions)
- Reformat HTML output somewhat
- Fix search-and-replace error in libwrap code
- Made servername a config option
- Renamed -r to -n (NON-recursive)
- Changed the DEF_LOGFILE (it pointed to ample.conf instead of ample.log)
- Much work on autoconf stuff, should work much better now
- Some more testing on other architectures (Ive compiled it on everything from Tru64 to Linux to *BSD)
<<lessAMPLE is short for "A MP3 LEnder" (interesting name just to make a good abbreviation?)
I wrote AMPLE one summer when I was coding for a company and got fed up with having to FTP over all my MP3 files from my home server to the computer at work just to listen to them. And the other "MP3 servers" I could find didnt fit my needs for one of the following reasons:
Depended on libfoo, libbar, python, perl, php3, Apache, libssl, etc, etc, etc...I just wanted to listen to the files
Had a lot of features for "DJ:ing" etc that I really didnt need
Well....it was fun to write too :)
So whats good with AMPLE?
Small, standalone (written in C using no external libraries)
Portable (I think), I often try to compile it on the SourceForge compile farms
Allows you to listen to your own MP3s away from home, nothing more, nothing less
This is beginning to sound like marketing cr*p so Ill just stop right there, check out the links on the left for more info.
Enhancements:
- Make ID3v2 code understand versions 2.2.0 -> 2.4.0 (all currently existing versions)
- Reformat HTML output somewhat
- Fix search-and-replace error in libwrap code
- Made servername a config option
- Renamed -r to -n (NON-recursive)
- Changed the DEF_LOGFILE (it pointed to ample.conf instead of ample.log)
- Much work on autoconf stuff, should work much better now
- Some more testing on other architectures (Ive compiled it on everything from Tru64 to Linux to *BSD)
Download (0.026MB)
Added: 2006-04-19 License: GPL (GNU General Public License) Price:
1285 downloads
KmPg2 MPEG2 Encoder 1.96
KmPg2 is a user friendly MPEG2 encoding wizard that allows the user to create high quality DVD compatible MPEG2 streams. more>>
KmPg2 is a very simple to use MPEG2 encoding wizard that allows the user to create high quality DVD compatible MPEG2 streams, without requiring any technical knowledge.
Creating high quality MPEG2 streams involves a lot more than simply feeding the input video to mpeg2enc/transcode/mencoder/etc.
The input video needs to be carefully prepared by pulling it through a chain of stream processing tools like low-pass filters, color correction filters, static and dynamic chroma and luma noise filters, scalers, and so on.
This processing chain needs to be tuned in such a way that all irrelevant data (like noise) is removed before the video enters the encoder. KmPg2 uses the video processing / encoding tools from the MJPEGTools project to achieve this.
KmPg2 features a profiler that enables the user to interactively create custom pre-processing pipelines that are optimised for a specific type of video material. These preprocessing pipelines (profiles) can be stored and used with the actual encoding wizard.
For example, you could create a profile that is designed especially for restoring a single aging VHS tape, or you could create a profile tuned for your digital camcorder and re-use it for every new recording that needs to be encoded.
At this moment KmPg2 accepts only one format of input video: Raw Sony DV video streams. This is the video format that most people use nowadays for high quality video processing and editing. Support for using AVI files for input is expected in future versions.
Main features:
- Produces DVD compliant MPEG2 streams
- Seperate chroma/luma noise filtering
- Low-Pass filtering support
- Contrast/Brightness/Saturation correction
- White balance correction
- Special black-and-white mode
- Crop image to Widescreen (16:9) or Panavision (2.35:1)
- Output conforms to Rec.601 specifications
- Both constant bitrate and variable bitrate encoding
- Unsharp masking
- Supports progressive and interlaced source material
- Support for removing overscan area
- Provides feedback to user about average/peak bitrates
- Show output on screen while encoding
- Generate encoding shell scripts
- Generate quick preview-encodings of parts of source video
<<lessCreating high quality MPEG2 streams involves a lot more than simply feeding the input video to mpeg2enc/transcode/mencoder/etc.
The input video needs to be carefully prepared by pulling it through a chain of stream processing tools like low-pass filters, color correction filters, static and dynamic chroma and luma noise filters, scalers, and so on.
This processing chain needs to be tuned in such a way that all irrelevant data (like noise) is removed before the video enters the encoder. KmPg2 uses the video processing / encoding tools from the MJPEGTools project to achieve this.
KmPg2 features a profiler that enables the user to interactively create custom pre-processing pipelines that are optimised for a specific type of video material. These preprocessing pipelines (profiles) can be stored and used with the actual encoding wizard.
For example, you could create a profile that is designed especially for restoring a single aging VHS tape, or you could create a profile tuned for your digital camcorder and re-use it for every new recording that needs to be encoded.
At this moment KmPg2 accepts only one format of input video: Raw Sony DV video streams. This is the video format that most people use nowadays for high quality video processing and editing. Support for using AVI files for input is expected in future versions.
Main features:
- Produces DVD compliant MPEG2 streams
- Seperate chroma/luma noise filtering
- Low-Pass filtering support
- Contrast/Brightness/Saturation correction
- White balance correction
- Special black-and-white mode
- Crop image to Widescreen (16:9) or Panavision (2.35:1)
- Output conforms to Rec.601 specifications
- Both constant bitrate and variable bitrate encoding
- Unsharp masking
- Supports progressive and interlaced source material
- Support for removing overscan area
- Provides feedback to user about average/peak bitrates
- Show output on screen while encoding
- Generate encoding shell scripts
- Generate quick preview-encodings of parts of source video
Download (0.068MB)
Added: 2006-06-11 License: GPL (GNU General Public License) Price:
1250 downloads
RPM Delta Compression Virtual Update Repository 0.2.0
RPM Delta Compression Virtual Update Repository for significantly reducing the bandwidth required to apply updates. more>>
RPM Delta Compression Virtual Update Repository is an experiment to explore the possibility of significantly reducing the bandwidth required to apply updates to a Fedora installation.
This software includes a server which provides a virtual update repository to clients such as yum, up2date, or other update tools. RPM Delta Compression Virtual Update Repository also includes a utility to create and maintain a RPM delta repository.
The server will attempt to generate the update RPM from a small delta file applied to a locally stored RPM from the original distribution.
Enhancements:
- This version utilizes the SuSE deltarpm tool as the underlying delta generator.
- It features both HTTP virtual update of the RPM repository (using Tomcat servlet container) and command line tools for generating update RPMs from a delta repository.
<<lessThis software includes a server which provides a virtual update repository to clients such as yum, up2date, or other update tools. RPM Delta Compression Virtual Update Repository also includes a utility to create and maintain a RPM delta repository.
The server will attempt to generate the update RPM from a small delta file applied to a locally stored RPM from the original distribution.
Enhancements:
- This version utilizes the SuSE deltarpm tool as the underlying delta generator.
- It features both HTTP virtual update of the RPM repository (using Tomcat servlet container) and command line tools for generating update RPMs from a delta repository.
Download (0.24MB)
Added: 2006-03-02 License: GPL (GNU General Public License) Price:
1334 downloads
High Level Virtual Machine 0.1
High Level Virtual Machine is a toolkit for developing virtual machines for dynamic languages. more>>
High Level Virtual Machine is a toolkit for developing virtual machines for dynamic languages.
The High Level Virtual Machine is:
- Based on LLVM (Low Level Virtual Machine). LLVM is HLVMs sister project. HLVM gains tremendous capability from LLVM in the areas of code generation, bytecode storage, runtime execution, etc.
- Aimed at supporting dynamic languages such as Ruby, Python, Perl, Jython, Haskell, Prolog, etc.
- A complete compiler developers toolkit for creating new languages easily. To write a new compiler, language designers simply write a plugin that describes the language to HLVM and how to translate the grammar productions into HLVMs comprehensive Abstract Syntax Tree (AST). After that, HLVM handles all aspects of code generation, bytecode storage, XML translation, JIT execution or interpretation, and native compilation.
- A language interoperability framework. Because all front end compilers generate code in the same AST, they can interoperate. Use of the runtime library for common constructs (e.g. "string") allow even complex data types to be shared between languages. Users of HLVM can write complex programs in multiple languages and be assured the result can be executed efficiently.
- A code management system including code revisioning, interface versioning, automated recompilation, separation of workspaces, etc.
- Currently under development. Project started April 20th, 2006. Stay tuned to this web site for future developments.
<<lessThe High Level Virtual Machine is:
- Based on LLVM (Low Level Virtual Machine). LLVM is HLVMs sister project. HLVM gains tremendous capability from LLVM in the areas of code generation, bytecode storage, runtime execution, etc.
- Aimed at supporting dynamic languages such as Ruby, Python, Perl, Jython, Haskell, Prolog, etc.
- A complete compiler developers toolkit for creating new languages easily. To write a new compiler, language designers simply write a plugin that describes the language to HLVM and how to translate the grammar productions into HLVMs comprehensive Abstract Syntax Tree (AST). After that, HLVM handles all aspects of code generation, bytecode storage, XML translation, JIT execution or interpretation, and native compilation.
- A language interoperability framework. Because all front end compilers generate code in the same AST, they can interoperate. Use of the runtime library for common constructs (e.g. "string") allow even complex data types to be shared between languages. Users of HLVM can write complex programs in multiple languages and be assured the result can be executed efficiently.
- A code management system including code revisioning, interface versioning, automated recompilation, separation of workspaces, etc.
- Currently under development. Project started April 20th, 2006. Stay tuned to this web site for future developments.
Download (0.12MB)
Added: 2006-06-15 License: LGPL (GNU Lesser General Public License) Price:
1227 downloads

SpaceTheremin for Linux 1.0
This is a virtual mouse-controlled theremin. more>> This is a virtual mouse-controlled theremin. Unlike a standard analog theremin, which typically has a sinewave oscillator and some basic vibrato, SpaceTheremin lets you choose from six different oscillator types (sine, square, triangle, sinc, saw, and pulse). The same waveforms can also be used for vibrato.<<less
Download (225KB)
Added: 2009-03-31 License: Freeware Price: Free
207 downloads
iPod Video Encoder 1.0.2
iPod Video Encoder is a command line tool for convenient encoding of video files for use on iPod video. more>>
iPod Video Encoder is a command line tool for convenient encoding of video files for use on iPod video. iPod Video Encoder project uses the ffmpeg tool for the actual encoding.
It features recursive encoding of all files in a directory, and generating a podcast.xml file for convenient use in iTunes.
It can be used in a cron job that periodically checks directories for new files and encodes them without user intervention.
Main features:
- Encoding of single files
- Optional specification of a/v bitrates
- Recursively encode all files in a directory
- Generating a podcast.xml for convenient use in iTunes
Options:
--version show programs version number and exit
-h, --help show this help message and exit
-R, --recursive Process directories recusively
-f, --force Force re-encode existing iPod videos
-t, --test Only encode first 10 seconds, to produce test videos
-e EXTENSIONS, --extensions=EXTENSIONS
Comma separated list of input extensions. Default: avi
-i IPODEXT, --ipodext=IPODEXT
iPod extension. Default: .ipod.mp4
-b VIDEO_RATE, --video-rate=VIDEO_RATE
Video bit rate, in kbps (default: 1024)
-a AUDIO_RATE, --audio-rate=AUDIO_RATE
Audio bit rate, in kbps (128)
-W WIDTH, --width=WIDTH
Video width, in pixels (default: 320)
-H HEIGHT, --height=HEIGHT
Video height, in pixels (default: 240)
-P, --pretend Do not really encode, just print out the ffmpeg
commands which would be executed
-v, --verbose Enable verbose output
Podcast options:
-p, --podcast Generate a podcast.xml file for each directory.
--podcast-documentroot=PODCAST_DOCUMENTROOT
Podcast document root; eg. /var/data/Movies/
--podcast-baseurl=PODCAST_BASEURL
Podcast base URL; eg. http://localhost/
Enhancements:
- Only uses the -e option for processing directories.
- The default ipod extension is now _ipod.mp4 for Windows compatibility.
- The README file has been extended with information on the .ipod-encoder settings file.
- The program no longer crashes when HOME is not set on Windows.
- --width and --height parameters have been added.
<<lessIt features recursive encoding of all files in a directory, and generating a podcast.xml file for convenient use in iTunes.
It can be used in a cron job that periodically checks directories for new files and encodes them without user intervention.
Main features:
- Encoding of single files
- Optional specification of a/v bitrates
- Recursively encode all files in a directory
- Generating a podcast.xml for convenient use in iTunes
Options:
--version show programs version number and exit
-h, --help show this help message and exit
-R, --recursive Process directories recusively
-f, --force Force re-encode existing iPod videos
-t, --test Only encode first 10 seconds, to produce test videos
-e EXTENSIONS, --extensions=EXTENSIONS
Comma separated list of input extensions. Default: avi
-i IPODEXT, --ipodext=IPODEXT
iPod extension. Default: .ipod.mp4
-b VIDEO_RATE, --video-rate=VIDEO_RATE
Video bit rate, in kbps (default: 1024)
-a AUDIO_RATE, --audio-rate=AUDIO_RATE
Audio bit rate, in kbps (128)
-W WIDTH, --width=WIDTH
Video width, in pixels (default: 320)
-H HEIGHT, --height=HEIGHT
Video height, in pixels (default: 240)
-P, --pretend Do not really encode, just print out the ffmpeg
commands which would be executed
-v, --verbose Enable verbose output
Podcast options:
-p, --podcast Generate a podcast.xml file for each directory.
--podcast-documentroot=PODCAST_DOCUMENTROOT
Podcast document root; eg. /var/data/Movies/
--podcast-baseurl=PODCAST_BASEURL
Podcast base URL; eg. http://localhost/
Enhancements:
- Only uses the -e option for processing directories.
- The default ipod extension is now _ipod.mp4 for Windows compatibility.
- The README file has been extended with information on the .ipod-encoder settings file.
- The program no longer crashes when HOME is not set on Windows.
- --width and --height parameters have been added.
Download (0.010MB)
Added: 2006-01-20 License: GPL (GNU General Public License) Price:
1379 downloads
C# Java Virtual Machine 1.0.1
C# Java Virtual Machine is a tiny implementation of the Java VM, including simple native classes. more>>
C# Java Virtual Machine is a tiny implementation of the Java VM, including simple native classes. This project is written using the C# language. The VM is very easily expandable by writing additional native or Java classes.
Enhancements:
- The DbConnection class, which provides a connection to MS SQL or PostgreSQL using ADO.NET, was added.
- The Syst.MachineName method, which returns the machine name, was added.
- String.startsWith and String.endsWith functions were added.
- Some comments for VM.cs were written.
<<lessEnhancements:
- The DbConnection class, which provides a connection to MS SQL or PostgreSQL using ADO.NET, was added.
- The Syst.MachineName method, which returns the machine name, was added.
- String.startsWith and String.endsWith functions were added.
- Some comments for VM.cs were written.
Download (0.40MB)
Added: 2007-05-25 License: GPL (GNU General Public License) Price:
884 downloads
joeq virtual machine 20030812
joeq virtual machine is a language-independent Java virtual machine implemented in Java. more>>
Joeq is a virtual machine and compiler infrastructure designed to facilitate research in virtual machine technologies such as Just-In-Time and Ahead-Of-Time compilation, advanced garbage collection techniques, distributed computation, sophisticated scheduling algorithms, and advanced run time techniques.
Joeq is entirely implemented in Java, leading to reliability, portability, maintainability, and efficiency. It is also language-independent, so code from any supported language can be seamlessly compiled, linked, and executed -- all dynamically.
Each component of the virtual machine is written to be independent with a general but well-defined interface, making it easy to experiment with new ideas.
Joeq is released as open source software, and is being used as a framework by researchers on five continents on topics ranging from automatic distributed virtual machines to whole-program pointer analysis.
Joeq is a virtual machine and compiler infrastructure designed to be a platform for research in compilation and virtual machine technologies. We had three main goals in designing the system. First and foremost, we wanted the system to be flexible. We are interested in a variety of compiler and virtual machine research topics, and we wanted a system that would not be specific to researching a particular area.
For example, we have interest in both static and dynamic compilation techniques, and in both type-safe and unsafe languages. We wanted a system that would be as open and general as possible, without sacrificing usability or performance.
Second, we wanted the system to be easy to experiment with. As its primary focus is research, it should be straightforward to prototype new ideas in the framework. With this in mind, we tried to make the system as modular as possible, so that each component is easily replaceable. Learning from our experience with Jalapeno, another virtual machine written in Java, we decided to implement the entire system in Java.
This makes it easy to quickly implement and prototype new ideas, and features like garbage collection and exception tracebacks ease debugging and improve productivity. Java, being a dynamic language, is also a good consumer for many of our dynamic compilation techniques; the fact that our dynamic compiler can compile the code of the virtual machine itself means that it can dynamically optimize the virtual machine code with respect to the application that is running on it. Javas object-oriented nature also facilitates modularity of the design and implementation.
Third, we wanted the system to be useful to a wide audience. The fact that the system is written in Java means that much of the system can be used on any platform that has an implementation of a Java virtual machine. The fact that Joeq supports popular input languages like Java, C, C++, Fortran, and even x86 binary code increases the scope of input programs. We released the system on the SourceForge web site as open source under the Library GNU Public License.
It has been picked up by researchers on five continents for various purposes, among them: automatic extraction of component interfaces, static whole-program pointer analysis, context-sensitive call graph construction, automatic distributed computation, versioned type systems for operating systems, sophisticated profiling of applications, advanced dynamic compilation techniques, system checkpointing, anomaly detection, secure execution platforms and autonomous systems. In addition, Joeq is now used as the basis of the Advanced Compilation Techniques class taught at Stanford University.
Joeq supports two modes of operation: native execution and hosted execution. In native execution, the Joeq code runs directly on the hardware. It uses its own run-time routines, thread package, garbage collector, etc. In hosted execution, the Joeq code runs on top of another virtual machine. Operations to access objects are translated into calls into the reflection library of the host virtual machine.
The user code that executes is identical, and only a small amount of functionality involving unsafe operations is not available when running in hosted execution mode. Hosted execution is useful for debugging purposes and when the underlying machine architecture is not yet directly supported by Joeq. We also use hosted execution mode to bootstrap the system and perform checkpointing, a technique for optimizing application startup times.
Joeq system consists of seven major parts:
- Front-end: Handles the loading and parsing of input files, such as Java class files, SUIF files, and binary object files.
- Compiler: A framework for performing analyses and optimizations on code. This includes the intermediate representation (IR) of our compiler.
- Back-end: Converts the compilers intermediate representation into native, executable code. This code can be output to an object file or written into memory to be executed. In addition, it generates metadata about the generated code, such as garbage collection maps and exception handling information.
- Interpreter: Directly interprets the various forms of compiler intermediate representations.
- Memory Manager: Organizes and manages memory. Joeq supports both explicitly-managed and garbage-collected memory.
- Dynamic: Provides profile data to the code analysis and optimization component, makes compilation policy decisions, and drives the dynamic compiler.
- Run-time Support: Provides runtime support for introspection, thread scheduling, synchronization, exception handling, interfacing to external code, and language-specific features such as dynamic type checking.
<<lessJoeq is entirely implemented in Java, leading to reliability, portability, maintainability, and efficiency. It is also language-independent, so code from any supported language can be seamlessly compiled, linked, and executed -- all dynamically.
Each component of the virtual machine is written to be independent with a general but well-defined interface, making it easy to experiment with new ideas.
Joeq is released as open source software, and is being used as a framework by researchers on five continents on topics ranging from automatic distributed virtual machines to whole-program pointer analysis.
Joeq is a virtual machine and compiler infrastructure designed to be a platform for research in compilation and virtual machine technologies. We had three main goals in designing the system. First and foremost, we wanted the system to be flexible. We are interested in a variety of compiler and virtual machine research topics, and we wanted a system that would not be specific to researching a particular area.
For example, we have interest in both static and dynamic compilation techniques, and in both type-safe and unsafe languages. We wanted a system that would be as open and general as possible, without sacrificing usability or performance.
Second, we wanted the system to be easy to experiment with. As its primary focus is research, it should be straightforward to prototype new ideas in the framework. With this in mind, we tried to make the system as modular as possible, so that each component is easily replaceable. Learning from our experience with Jalapeno, another virtual machine written in Java, we decided to implement the entire system in Java.
This makes it easy to quickly implement and prototype new ideas, and features like garbage collection and exception tracebacks ease debugging and improve productivity. Java, being a dynamic language, is also a good consumer for many of our dynamic compilation techniques; the fact that our dynamic compiler can compile the code of the virtual machine itself means that it can dynamically optimize the virtual machine code with respect to the application that is running on it. Javas object-oriented nature also facilitates modularity of the design and implementation.
Third, we wanted the system to be useful to a wide audience. The fact that the system is written in Java means that much of the system can be used on any platform that has an implementation of a Java virtual machine. The fact that Joeq supports popular input languages like Java, C, C++, Fortran, and even x86 binary code increases the scope of input programs. We released the system on the SourceForge web site as open source under the Library GNU Public License.
It has been picked up by researchers on five continents for various purposes, among them: automatic extraction of component interfaces, static whole-program pointer analysis, context-sensitive call graph construction, automatic distributed computation, versioned type systems for operating systems, sophisticated profiling of applications, advanced dynamic compilation techniques, system checkpointing, anomaly detection, secure execution platforms and autonomous systems. In addition, Joeq is now used as the basis of the Advanced Compilation Techniques class taught at Stanford University.
Joeq supports two modes of operation: native execution and hosted execution. In native execution, the Joeq code runs directly on the hardware. It uses its own run-time routines, thread package, garbage collector, etc. In hosted execution, the Joeq code runs on top of another virtual machine. Operations to access objects are translated into calls into the reflection library of the host virtual machine.
The user code that executes is identical, and only a small amount of functionality involving unsafe operations is not available when running in hosted execution mode. Hosted execution is useful for debugging purposes and when the underlying machine architecture is not yet directly supported by Joeq. We also use hosted execution mode to bootstrap the system and perform checkpointing, a technique for optimizing application startup times.
Joeq system consists of seven major parts:
- Front-end: Handles the loading and parsing of input files, such as Java class files, SUIF files, and binary object files.
- Compiler: A framework for performing analyses and optimizations on code. This includes the intermediate representation (IR) of our compiler.
- Back-end: Converts the compilers intermediate representation into native, executable code. This code can be output to an object file or written into memory to be executed. In addition, it generates metadata about the generated code, such as garbage collection maps and exception handling information.
- Interpreter: Directly interprets the various forms of compiler intermediate representations.
- Memory Manager: Organizes and manages memory. Joeq supports both explicitly-managed and garbage-collected memory.
- Dynamic: Provides profile data to the code analysis and optimization component, makes compilation policy decisions, and drives the dynamic compiler.
- Run-time Support: Provides runtime support for introspection, thread scheduling, synchronization, exception handling, interfacing to external code, and language-specific features such as dynamic type checking.
Download (1.0MB)
Added: 2005-04-22 License: LGPL (GNU Lesser General Public License) Price:
1645 downloads
Network Virtual Terminal for Java 1.0 Alpha 1
Network Virtual Terminal for Java is a library that can drive a terminal emulator. more>>
Network Virtual Terminal for Java is a library that can drive a terminal emulator connected to the application through a telnet session.
Usage:
The API consists of the interface nvt4j.Terminal . The implementation of this class is called nvt4j.impl.Terminal. To allow the user to connect to the application you need to listen for a tcp connection and then wrap a Terminal object around it:
ServerSocket serverSocket = new ServerSocket(8000);
Socket socket = serverSocket.accept();
Terminal terminal = new nvt4j.impl.Terminal(socket);
For example, to run the sample class Example.java from an xterm session, you can
do this:
user@localhost$ java -classpath nvt4j.jar Example &
user@localhost$ telnet localhost 8000
NVT4J uses the Telnet LINEMODE option to put the terminal driver (xterm in this case) in what the posix standard calls raw or non-canonical mode, so that it can receive all user inputs asap, instead of waiting for a new-line character.
Unfortunately in pure Java there is no way to put the operating system console in
raw mode. On Linux and similar systems this is done using the stty command, which is a native program which manipulates the terminal driver in the operating system.
Whats New in This Release:
First alpha release. This code is quite limited but it already provides the basic functions needed to drive a terminal emulator for Java, namely putting the terminal driver in raw mode, turning off the cursor and client-side echo, and detecting the size of the terminal emulator window.
This code has been tested only with xterm.
<<lessUsage:
The API consists of the interface nvt4j.Terminal . The implementation of this class is called nvt4j.impl.Terminal. To allow the user to connect to the application you need to listen for a tcp connection and then wrap a Terminal object around it:
ServerSocket serverSocket = new ServerSocket(8000);
Socket socket = serverSocket.accept();
Terminal terminal = new nvt4j.impl.Terminal(socket);
For example, to run the sample class Example.java from an xterm session, you can
do this:
user@localhost$ java -classpath nvt4j.jar Example &
user@localhost$ telnet localhost 8000
NVT4J uses the Telnet LINEMODE option to put the terminal driver (xterm in this case) in what the posix standard calls raw or non-canonical mode, so that it can receive all user inputs asap, instead of waiting for a new-line character.
Unfortunately in pure Java there is no way to put the operating system console in
raw mode. On Linux and similar systems this is done using the stty command, which is a native program which manipulates the terminal driver in the operating system.
Whats New in This Release:
First alpha release. This code is quite limited but it already provides the basic functions needed to drive a terminal emulator for Java, namely putting the terminal driver in raw mode, turning off the cursor and client-side echo, and detecting the size of the terminal emulator window.
This code has been tested only with xterm.
Download (0.039MB)
Added: 2006-01-19 License: The Apache License 2.0 Price:
1378 downloads
Linux Virtual Server 1.21
Linux Virtual Server is a load-balancing and server clustering system for Linux. more>>
The Linux Virtual Server is a highly scalable and highly available server built on a cluster of real servers, with the load balancer running on the Linux operating system.
The architecture of the server cluster is fully transparent to end users, and the users interact as if it were a single high-performance virtual server.
The basic goal of the Linux Virtual Server Project is to:
- Build a high-performance and highly available server for Linux using clustering technology, which provides good scalability, reliability and serviceability.
<<lessThe architecture of the server cluster is fully transparent to end users, and the users interact as if it were a single high-performance virtual server.
The basic goal of the Linux Virtual Server Project is to:
- Build a high-performance and highly available server for Linux using clustering technology, which provides good scalability, reliability and serviceability.
Download (0.03MB)
Added: 2005-04-06 License: GPL (GNU General Public License) Price:
1673 downloads
Virtual Cron 0.1
Virtual Cron is a PHP library that can check whether it is time to run a periodical task. more>>
Virtual Cron is a PHP library that can check whether it is time to run a periodical task. The class can be used to check whether it is time to run a task that must run from time to time.
It creates a control file to keep track the last time the task was scheduled.
The class can check the control file last modification time to determined whether it passed a given period of time since the last time the task was run.
If the given interval time has passed since the last run, the class recreates the control file and returns true to inform the application that is time to run the task again.
<<lessIt creates a control file to keep track the last time the task was scheduled.
The class can check the control file last modification time to determined whether it passed a given period of time since the last time the task was run.
If the given interval time has passed since the last run, the class recreates the control file and returns true to inform the application that is time to run the task again.
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Added: 2007-04-24 License: LGPL (GNU Lesser General Public License) Price:
924 downloads
The 64 bit Virtual CPU Project 0.0.23
The 64 bit Virtual CPU Project is a project to create 64-bit virtual CPU. more>>
This is a project to create 64-bit virtual CPU, create a 64 bit assembler for the CPU and then port C to it, and then create scripts to port GNU/Linux to it.
The aim is to run 64-bit Linux on common 8/16/32 bit CPUs in applications where speed is not an issue.
Enhancements:
- Added C code intended tor a PIC Preliminary documentation More updates to Gambas program
<<lessThe aim is to run 64-bit Linux on common 8/16/32 bit CPUs in applications where speed is not an issue.
Enhancements:
- Added C code intended tor a PIC Preliminary documentation More updates to Gambas program
Download (0.67MB)
Added: 2005-07-06 License: GPL (GNU General Public License) Price:
1600 downloads
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