The Free Lossless Audio Codec (FLAC) is a widely used lossless audio codec, which means that the audio is compressed without any loss of quality. A decoded FLAC stream is bit-for-bit identical to the original uncompressed audio file.
The JavaScript decoder was ported from the FFMpeg project and the demuxer is based on the original FLAC documentation. flac.js uses the Aurora audio framework by ofmlabs to facilitate decoding and playback.
You can check out a demo alongside our other decoders alac.js, MP3.js, and AAC.js. Currently flac.js works properly in the latest versions of Firefox, Chrome, and Safari.
flac.js was written by @jensnockert and @devongovett of Audiocogs.
We use browserify to build flac.js. You can download a prebuilt version from the Github releases page. To build flac.js for the browser yourself, use the following commands:
npm install
make browser
This will place a built flac.js file, as well as a source map in the build/ directory.
flac.js depends on Aurora.js, our audio codec framework. For detailed information on how to use Aurora.js, check out the documentation.
flac.js is licensed under the same terms as the original FLAC decoder in FFMpeg. The original license follows.
FLAC.js is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
FLAC.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.