If the audio contains multiple channels, each channel is encoded separately as a subblock.

In the first stage, the input audio is split into blocks. The FLAC encoding algorithm consists of multiple stages. FLAC uses Vorbis comments for some types of metadata, like the title and artist name. It may also contain other information, the album cover for example. Properties like the sample rate and the number of channels are always contained in the metadata. The data block contains the audio information. The rest of the header contains the number of samples, position of the frame, channel assignment, and optionally the sample rate and bit depth. A frame header begins with a sync word, used to identify the beginning of a valid frame. Each frame is encoded independent of each other. The encoded audio is divided into frames, which consists of a header, a data block, and a CRC16 checksum. Design File structure Ī FLAC file consists of the magic number fLaC, metadata, and encoded audio. In its stated goals, the FLAC project encourages its developers not to implement copy prevention features ( DRM) or lossy compression of any kind. The source code for libFLAC and libFLAC++ is available under the BSD license, and the sources for flac, metaflac, and the plugins are available under the GNU General Public License. The reference implementation is free software. The specification of the stream format can be implemented by anyone without prior permission ( reserves the right to set the FLAC specification and certify compliance), and neither the FLAC format nor any of the implemented encoding or decoding methods are covered by any patent.

With incorporation, the Ogg container format, suitable for streaming (also called Ogg FLAC).

Input plugins for various music players ( Winamp, XMMS, foobar2000, musikCube, and many more).

metaflac, a command-line metadata editor for.

flac, a command-line program based on libFLAC to encode and decode FLAC streams.

libFLAC++, an object-oriented wrapper around libFLAC.

libFLAC, a library of reference encoders and decoders, and a metadata interface.

A simple container format for the stream, also called FLAC (or Native FLAC).

Version 1.3.0 was released on, at which point development was moved to the git repository.

is home to other free compression formats such as Vorbis, Theora, Speex and Opus. On 29 January 2003, the Xiph.Org Foundation and the FLAC project announced the incorporation of FLAC under the banner. Version 1.0 was released on 20 July 2001. The bit-stream format was frozen when FLAC entered beta stage with the release of version 0.5 of the reference implementation on 15 January 2001. Development was started in 2000 by Josh Coalson.

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