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mp3fs

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FUSE-based transcoding filesystem from FLAC to MP3

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# mp3fs

[![Build
Status](https://app.travis-ci.com/khenriks/mp3fs.svg?branch=master)](https://app.travis-ci.com/khenriks/mp3fs)

Web site: <http://khenriks.github.io/mp3fs/>

mp3fs is a read-only FUSE filesystem which transcodes between audio formats
(currently FLAC and Ogg Vorbis to MP3) on the fly when opened and read.

This can let you use a FLAC or Ogg Vorbis collection with software and/or
hardware which only understands the MP3 format, or transcode files through
simple drag-and-drop in a file browser.

For installation instructions see the [install](INSTALL.md) file.

## Usage

Mount your filesystem like this:

mp3fs [-b bitrate] musicdir mountpoint [-o fuse_options]

For example,

mp3fs -b 128 /mnt/music /mnt/mp3 -o allow_other,ro

In recent versions of FUSE and mp3fs, the same can be achieved with the
following entry in `/etc/fstab`:

mp3fs#/mnt/music /mnt/mp3 fuse allow_other,ro,bitrate=128 0 0

At this point the files `/mnt/music/**.flac` and `/mnt/music/**.ogg` will show
up as `/mnt/mp3/**.mp3`.

**Tip:** If your mp3fs mount fails because the underlying filesystem hasn't
been mounted yet, try adding the `x-systemd.requires-mounts-for=/mnt/music`
mount option, where `/mnt/music` would be the location of the underlying mount.

## How it Works

When a file is opened, the decoder and encoder are initialised and the file
metadata is read. At this time the final filesize can be determined when using
constant bitrate (CBR) MP3 files. We also support VBR output, but can only
estimate the size in that case.

As the file is read, it is transcoded into an internal per-file buffer. This
buffer continues to grow while the file is being read until the whole file is
transcoded in memory. The memory is freed only when the file is closed. This
simplifies the implementation.

Seeking within a file will cause the file to be transcoded up to the seek point
(if not already done). This is not usually a problem since most programs will
read a file from start to finish. Future enhancements may provide true random
seeking.

ID3 version 2.4 and 1.1 tags are created from the Vorbis comments in the FLAC
or Ogg Vorbis file. They are located at the start and end of the file
respectively.

A special optimisation is made so that applications which scan for id3v1 tags
do not have to wait for the whole file to be transcoded before reading the tag.
This *dramatically* speeds up such applications.

## Development

mp3fs uses Git for revision control. You can obtain the full repository with:

git clone https://github.com/khenriks/mp3fs.git

mp3fs is written in a mixture of C and C++ and uses the following libraries:

- [FUSE](http://fuse.sourceforge.net/)
- [FLAC](http://flac.sourceforge.net/)
- [libvorbis](http://www.xiph.org/vorbis/)
- [LAME](http://lame.sourceforge.net/)
- [libid3tag](http://www.underbit.com/products/mad/)

## Authors

This program is maintained by K. Henriksson, who is the primary author from
2008 to present.

The original maintainer and author was David Collett from 2006 to 2008. Much
thanks to him for his original work.

## License

This program can be distributed under the terms of the GNU GPL version 3 or
later. It can be found [online](http://www.gnu.org/licenses/gpl-3.0.html) or in
the COPYING file.

This and other documentation may be distributed under the GNU Free
Documentation License (GFDL) 1.3 or later with no invariant sections, or
alternatively under the GNU General Public License (GPL) version 3 or later.
The GFDL can be found [online](http://www.gnu.org/licenses/fdl-1.3.html) or in
the COPYING.DOC file.

mp3fs

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