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A formal specification for Lib-Ray is not yet written. That's one of the goals of the present project. We do have a general design concept which is explained below.
Lib-Ray is essentially a "multimedia website on a disk".
Several elements are defined:
Although the SDHC card is entirely compatible with the MMC standard, is more widely available, and can be used to carry Lib-Ray, it is explicitly a violation of the Lib-Ray standard to employ any of its non-MMC features such as DRM encryption. Lib-Ray players are not required to implement support for these elements (they should follow the freely available MMC standard), and may therefore refuse to play cards that violate this rule.
The file-system on the Lib-Ray device will be Universal Disk Format (UDF). This is the same file system as used on DVD disks. For writable media like the recommended MMC/SD card, this will be the Plain build variant of UDF.
This includes three files at the top level, and three directories beneath:
At minimum, the menu system must contain the "index.html" file. It must provide a "Play" button. The play button anchor is identified by the use of the attribute "accesskey='p'". This indicates that the key-combination "Alt+P" will start playback.
At least one feature page must be included, "feature.html, although again, multiple features can be distinguished by name (as in "episode01.html). Each feature page must include an "invisible link" with the attribute "accesskey='q'" -- this provides the "Stop" functionality and will return to the menu.
Other recommended pages are: "Menu/audio.html" -- with a selection of available audio tracks, "Menu/subtitle.html" -- with available subtitle tracks OR you can use a single Menu/language.html menu to combine both.
One or more scenes menus are recommend, though not required. Names like "scenes01.html" with an index for each page of scenes are recommended.
A Lib-Ray disk must have at least one featured multimedia (video) file. For single-feature disks, the recommended name is "Media/feature.lrv". This should include the following tracks:
As part of the Lib-Ray project, we are writing a new developer's guide which will define Lib-Ray in detail as well as explain how to create a Lib-Ray release. Since the design is in flux at the moment, though, we don't have one available yet (and the previous guide is severely out of date, so it should not be used as a guide).