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The audio part of the MPEG standard specifies three layers, whereat each layer specifies its own file format. All three layers are using similar audio coding techniques, but they vary in efficiency and complexity. Layer I needs the fewest calculation time for en-/decoding a stream, layer III the most. But a layer I MPEG audio stream is bigger than a layer III stream at the same quality. This program is able to decode and play only layer I and II streams, layer III is not supported (yet?!?). The maplay decodes layer I and layer II MPEG audio streams and plays them using a CD-quality audio device or sends the to stdout normally as 16 bit signed PCM values, interleaved for stereo streams. This player supports all modes, which are single channel, stereo, joint stereo and dual channel, and all bitrates except free mode. The missing free mode support should not be a problem for now, because I haven't seen such a stream yet. LICENSE: GPL2 or later

libfishsound provides a simple programming interface for decoding and encoding audio data using the Xiph.org codecs (FLAC, Speex and Vorbis). libfishsound by itself is designed to handle raw codec streams from a lower level layer such as UDP datagrams. When these codecs are used in files, they are commonly encapsulated in Ogg to produce Ogg FLAC, Speex and Ogg Vorbis files. libfishsound is a wrapper around the existing codec libraries and provides a consistent, higher-level programming interface. It has been designed for use in a wide variety of applications; it has no direct dependencies on Ogg encapsulation, though it is most commonly used in conjunction with liboggz to decode or encode FLAC, Speex or Vorbis audio tracks in Ogg files, including Ogg Theora and Annodex.

Enscribe creates digital audio watermark images from photographic images. These images can only be seen using a third party frequency vs time display, such as Baudline (audio/baudline). Images are still visible even after such audio mangling techniques as MP3/Ogg compression, reverb, chorus, etc. Heavy EQ and flange can stripe out vertical sections, but they can also ruin an otherwise good song as well.

Audiotag is a command-line tool for mass tagging/renaming of audio files it supports the vorbis comment, id3 tags, and MP4 tags.

Mutagen is a Python module to handle audio metadata. It supports FLAC, M4A, Musepack, MP3, Ogg FLAC, Ogg Speex, Ogg Theora, Ogg Vorbis, MonkeysAudio, True Audio, and WavPack audio files. All versions of ID3v2 are supported, and all standard ID3v2.4 frames are parsed. It can read Xing headers to accurately calculate the bitrate and length of MP3s. ID3 and APEv2 tags can be edited regardless of audio format. It can also manipulate Ogg streams on an individual packet/page level.

This is a Python wrapper module for the libao, an audio abstraction library that lets you output to different devices using the same interface.

cplay is a curses-based front-end to various audio players. Supported players currently include: - mplayer - mpv - mpg321 - mpg123 - ogg123 - madplay - mikmod - mpg321 - splay - xmp - sox - speex

This is an XMMS input plugin for playing Nintendo(TM) 8bit NSF audio files. The module has a special panel for selecting multi track .nsf files.

eXtace is a Audio Visualization plugin for the X-Window System. It connects to ESD (Enlightened Sound Daemon) and displays the audio data as either a 3D textured landscape, 3d pointed landscape, 16-256 channel graphic EQ, a multi-mode Oscilloscope, or a Spectragram. All modes are fully scalable to nearly ANY resolution!

MP3val is a small, high-speed, free software tool for checking MPEG audio files' integrity. It can be useful for finding corrupted files (e.g. incompletely downloaded, truncated, containing garbage). MP3val is also able to fix most of the problems. Being a multiplatform application, MP3val can be runned both under Windows and under Linux (or BSD). The most common MPEG audio file type is MPEG 1 Layer III (mp3), but MP3val supports also other MPEG versions and layers. The tool is also aware of the most common types of tags (ID3v1, ID3v2, APEv2). The core component of MP3val is an application with command-line interface. There are also two graphical frontends for it: MP3val-frontend is a native Windows application (it is also included in the latest binary releases for Windows), mp3valgui is a multi-platform Python script (can be downloaded separately), written by an independent developer. Installing the latter under Windows is a bit tricky, so for Windows the first frontend is recommended.