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Monkey's Audio Codec is a lossless audio codec with good correspondence of compression (and decompression) ratio and time. Monkey's Audio Codec can be used for personal, educational and non-commercial purposes. Commercial usage requires prior written permission from Monkey's Audio author. This is community-maintained Unix port of earlier Monkey's Audio sources; it does not correspond to current official SDK releases (4.x).

Musepack is an audio compression format with a strong emphasis on high quality. It's not lossless, but it is designed for transparency, so that you won't be able to hear differences between the original wave file and the much smaller MPC file. It is based on the MPEG-1 Layer-2 / MP2 algorithms, but has rapidly developed and vastly improved and is now at an advanced stage in which it contains heavily optimized and patentless code.

Codec2 is an open source low bit rate speech codec designed for communications quality speech at 2400 bit/s and below. Applications include low bandwidth HF/VHF digital radio and VOIP trunking. Codec 2 operating at 2400 bit/s can send 26 phone calls using the bandwidth required for one 64 kbit/s uncompressed phone call. It fills a gap in open source, free-as-in-speech voice codecs beneath 5000 bit/s and is released under the GNU Lesser General Public License (LGPL).

The idea behind OpenAL is a 3d positional spatialized sound library analogous to OpenGL: instead of micromanaging each aspect of sound playback and effect, the application writer may limit themselves to placing the sounds in the scene and letting the native OpenAL implementation determine the correct amount of pitch alteration, gain attenuation, phase shift, etc, required to render the sounds correctly. That's the goal, anyway.

Depending on whether you're using a POE-aware environment or not, people wanting to tinker with mpd (Music Player Daemon) will use either POE::Component::Client::MPD or Audio::MPD. But even if the run-cores of those two modules differ completely, they are using the exact same common classes to represent the various mpd states and information. Therefore, those common classes have been outsourced to Audio::MPD::Common.

Pd is a real-time graphical programming environment for audio and graphical processing. It resembles the Max/MSP system but is much simpler and more portable; also Pd has two features not (yet) showing up in Max/MSP: first, via Mark Dank's GEM package, Pd can be used for simultaneous computer animation and computer audio. Second, an experimental facility is provided for defining and accessing data structures. Unofficial web site: http://puredata.org/

MusicBrainz Picard is a cross-platform application written in Python and is the official MusicBrainz tagger. Picard supports the majority of audio file formats, is capable of using audio fingerprints (AcoustIDs), performing CD lookups and disc ID submissions, and it has excellent Unicode support. Additionally, there are several plugins available that extend Picard's features. When tagging files, Picard uses an album-oriented approach. This approach allows it to utilize the MusicBrainz data as effectively as possible and correctly tag your music.

The G.722 module is a bit exact implementation of the ITU G.722 specification for all three specified bit rates - 64000bps, 56000bps and 48000bps. It passes the ITU tests. To allow fast and flexible interworking with narrow band telephony, the encoder and decoder support an option for the linear audio to be an 8k samples/second stream. In this mode the codec is considerably faster, and still fully compatible with wideband terminals using G.722.

TiMidity++ is a MIDI player without external MIDI instruments. This can also convert MIDI files to various formatted audio files (ex. wav, au, etc..). In addition to this port, "Gravis Ultra Sound" compatible patch files (or SF2 format SoundFont) are required to play files. Formerly, the original version of this program was written by Tuuka Toivonen(until version 0.2i). Now, Masanao Izumo and many hackers are developing "TiMidity++".

TTCP is a benchmarking tool for determining TCP and UDP performance between 2 systems. The program was created at the US Army Ballistics Research Lab (BRL) and is in the public domain. Feel free to distribute this program but please do leave the credit notices in the source and man page intact. How to get TCP performance numbers: receiver sender host1% ttcp -r -s host2% ttcp -t -s host1 -n and -l options change the number and size of the buffers.