Data file formats

This article is a stub. You can help the OLPC project by expanding it.

Introduction

Because the OLPC has limited storage and limited RAM, it is not a good idea to support every data format used on regular PCs. It makes more sense to use our PCs to convert data than to put that burden on the OLPC.

The libraries and packages in the build support various file formats. Some of this support is exposed through the various Activities and the files they load. Most activities list the mime types they support in their activity.info file. In a Terminal activity,

 cat ~olpc/Activity name.activity/activity/activity.info

and there will be a mime_types line.

List of supported formats

TODO: This should become a table of format - mime-type - activities supporting the format - a link to sample files for each file format.

• Image formats
  • JPEG 2000 (? does not work in Browse). [Sample file]
  • GIF
  • JPEG
  • PNG
  • SVG (in Browse, also directly by Sugar for icons). Sample files (not all work in Browse
  • TIFF (in Read via Evince). Sample files

• eBook formats
  • DJVU (coming some day to Read, see #6223). Sample files
  • PDF (in Read via Evince)

• Sound formats
  • Ogg Vorbis (supported by the Totem plugin for Browse). Sample file, also there are sample files in some OLPC builds in OLPC Library > media > music (equivalent web version.
  • WAV (supported by the Totem plugin for Browse). Sample files
  • the Totem and Gnash plugins for Browse claim to support other formats, enter about:plugins in the Browse location field.

• Video formats
  • Ogg Theora?
  • DV format ? (/usr/lib/libdv present)

• General formats
  • XML
  • SQLite (a lightweight relational database that is included in Python 2.5)
  • Gnu gdbm (supported by Python's dbm module)
  • Berkeley db version 4.3.0.1 (supported by Python's bsddb module)

• Compression formats
  • Uncompressed (this is listed because the JFFS2 filesystem on the OLPC will compress all compressable files)
  • GNU Zip (supported by Python's zlib module, and by Etoys)

• OLPC-specific formats
  • Journal entry bundles (a zip file with the ".xoj" extension and mime type 'application/vnd.olpc-journal-entry')