MPEG Maaate (MPEG audio analysis toolkit) is a C++ toolkit to parse and analyse audio data in the frequency domain, e.g. analysing MPEG-1/2 Layers 1-3 audio files in the compressed domain. It makes the encoded fields of an MPEG audio stream accessible and provides some content analysis functions like silence detection.
The Snack sound extension adds commands for sound play/record and sound visualization, e.g. waveforms and spectrograms. It supports in- memory sound objects, file based audio, streaming audio, WAV, AU, AIFF, and MP3 file formats, synchronous and asynchronous playback. The visualization canvas item types update in real-time and can output postscript. New commands and file formats can be added using the Snack C-API.
Lava's jWave is a versatile set of packages for Java that allow you to easily create and process RIFF files, with a special emphasis on reading and writing Microsoft PCM .wav files. jWave was initially released as an integrated feature of Lava, a general-purpose class library for Java. By popular demand, it is distributed in its own bundle.
getID3() is a PHP script that extracts useful information from MP3s and other multimedia file formats. It extracts information like the play time, bitrate, and resolution from the following file formats: MP3, Ogg Vorbis, WAV, AVI, Matroska (MKV), MPEG-1 video, Windows Media (ASF, WMA, WMV), RealAudio & RealVideo, Monkey's Audio, FLAC & OggFLAC, VQF, Speex, Musepack (MPC), AAC, AU, VOC, AIFF, OptimFROG, WavPack, LiteWave, LPAC, RKAU, SZIP, Shorten, Quicktime, NSV, MIDI, ZIP, ISO9660, TTA, PhotoCD, BMP, PNG, GIF, and JPEG. It parses information from ID3v1, ID3v2, Ogg Vorbis, Lyrics3 v1 & v2, RIFF (AVI, WAV, CDA, CART, BWF), APE, ReplayGain, PNG, and GIF tags, and can write ID3v1, ID3v2, APE2, FLAC, and Ogg Vorbis tags.
The MusicBrainz client library (also known as mb_client or libmusicbrainz) is a library for developers that wish to add MusicBrainz metadata lookup capabilities to their applications. It calculates CD Index IDs and Relatable's acoustic fingerprints, and looks up the metadata associated with the calculated IDs.
aubio is a library for audio labelling. Features include onset detection, silence detection, beat tracking, and pitch detection. The goal of this project is to provide automatic labelling features to other audio software projects. Functions can be used offline in sound editors and software samplers, or online in audio effects and virtual instruments.
CLAM is a multiplatform software framework for research and application development for the Audio and Music domains. It offers a conceptual model for building systems as well as tools for the analysis, synthesis, and transformation of audio signals using high level representation (notes, spectral peaks, etc.). It also provides multiplatform system abstraction and tools for audio and MIDI file handling, device handling, GUI and XML support, and more. It has proper Linux audio architecture integration (Ladspa, Alsa, OSC, Jack, VST, etc.) and rapid graphical prototyping both for the processing core and the user interface (Qt designer integration).