This library is a pure Java, Apache v2 licensed project for working with Ogg, Vorbis, FLAC, Opus, Speex and Theora files
Currently, support for the Ogg container is fairly complete, offering the ability to read, write, add and change streams within an Ogg file. It should be possible to use the Ogg parts as a basis for dealing with any multimedia data stored in an Ogg container. There is basic support for Skeleton Annodex streams, which provide metadata on top of Ogg files about the streams, but it isn't fully integrated.
Support for the Vorbis audio format so far concentrates on metadata. It is possible to retrieve and change metadata (such as sampling rates, user comments etc), and tools are provided to query and alter these (see the Tools section below). At this time, there is no support for decoding or encoding audio data. Contributions for these areas would be welcomed!
Opus and Speex support is slightly less than that of Vorbis, covering retrieving of metadata (such as sampling rates, user comments etc). However, basic Opus or Speex audio frame support is outstanding. Tooling exists for querying and changing metadata for Opus only. Contributions to expand Opus or Speex support are most appreciated!
Very limited support is also included for FLAC comments (user metadata), which use the same scheme as Vorbis. FLAC-native and FLAC-in-Ogg files are both supproted for extracting the user metadata.
Theora support is of a similar level to that for Opus and Speex, providing basic access to metadata (both video and soundtrack), but not much else.
As part of the project, a small number of pure Java tools are provided to help when working with Ogg and Vorbis files.
Two jar files are available. vorbis-java-tools.jar should be used when embedding the code, while vorbis-java-tools-jar-with-dependencies.jar is what should be used for standlone cases, as all dependencies are included.
Prints basic information on the streams in a file
Prints detailed information on the contents of a Vorbis file, including versions, comments, bitrates, channels and audio rates, codebooks and file length
Prints summary information on the contents of a Opus file, including versions, comments, channels and audio rates and file length
Prints detailed information on the contents of a FLAC file, including versions, comments, channels, frames and subframes.
Prints information on a skeleton-described ogg file, reporting on a per-bone basis about the streams described and their metadata
Allows the listing and editing of comments (user metadata) of a Vorbis file. Works similar to vorbiscomment commandline tool that ships with libvorbis
Allows the listing and editing of comments (user metadata) of an Opus file. Works similar to vorbiscomment commandline tool that ships with libvorbis, except for Opus files
Allows the listing of comments (user metadata) of a FlAC file (native or ogg contained) file. Works similar to vorbiscomment commandline tool that ships with libvorbis, except for FLAC files, and only supports listing
Included in the tika module are Parser and Detector plugins for Apache Tika for Ogg based file formats. Currently, parsers are only available for the Audio formats (Vorbis, Opus, Speex, Flac), but a basic stream info outputting parser exists for other Ogg types. Basic Theora video support exists, but full support is blocked pending a Tika decision on the best way to expose metadata for multiple streams.
Detection should handle all the well known Ogg formats (Audio and Video).
The parsers and detector include appropriate service registry entries for Tika to allow these plugins to be automatically loaded by Tika. Simply ensure that the tika module, and the core module are present on the Tika classpath and they will be used.
There are seven main classes that you can start with, depending on the kind of file you have, and your interests. These are:
Provides read and write support for Ogg files of all types, working at the packet / stream level
Provides read and write support for Ogg Vorbis audio files. Provides access to the key parts of the Vorbis file, such as info and comments. (No support yet for encoding or decoding the audio packets though)
Provides read support for Ogg Opus audio files. Provides access to the key parts of the Opus file, such as info and comments. (No support at all for audio packets, for now)
Provides read support for Ogg Speex audio files. Provides access to the key parts of the Speex file, such as info and comments. (No support at all for audio packets, for now)
Provides read support for FLAC files stored in an Ogg container. Allows access to the key parts of the file, such as Info, Tags and compressed audio. (No encoding or decoding of audio packets though)
Provides read support for regular FLAC files. Provides access to the key parts of the file, such as Info, Tags and compressed audio. (No encoding or decoding of audio packets though)
Provides read support for a Skeleton metadata stream, typically contained within a video or audio file.
The best way to see how to use the code is to look at the Tools Package, which has examples of reading and writing tags, and the Tika Package, which has examples of reading audio metadata. In addition, the unit tests can provide examples of uses too.
- Ogg file format - RFC3533, plus http://xiph.org/vorbis/doc/oggstream.html and http://xiph.org/vorbis/doc/framing.html
- Vorbis - http://xiph.org/vorbis/doc/
- Opus - http://www.opus-codec.org/docs/
- FLAC - https://xiph.org/flac/format.html
- FLAC in Ogg - https://xiph.org/flac/ogg_mapping.html
- Tika - http://tika.apache.org/