CDXL

CDXL

CDXL is an obsolete motion video file format developed by Commodore in the late 1980s and early 1990s for the Amiga computer platform. It is notable for being one of the earliest formats created for motion video playback from CD-ROM [cite web|url=http://www.sassenrath.com/carl.html|title=Former Commodore Engineer, Carl Sassenrath's home page] .

Background

In an era shortly after the introduction of CD-ROM drives and before low cost MPEG decoding hardware became available the CDXL format was created primarily for the Amiga CDTV to permit playback of video from CD-ROM. CDXL was tailored for the Amiga chipset and took advantage of DMA transfers and relied little on the CPU [cite web|url=http://www.freepatentsonline.com/5293606.html|title=Free Patents Online] . As a result CDXL could only support weak video compression and therefore relatively low video resolutions and moderate frame rates.

The CDXL format initially allowed playback of up to 24 frames per second with up to 4096 colors encoded in HAM-6. Audio support allowed for 8-bit mono or stereo sound. When the Amiga CD32 was released the format was able to support AGA color modes (up to 262,144 on-screen colors from a 24-bit color palette) and higher display resolutions.

CDXL is not related to the Interchange File Format (IFF) and is supported by AmigaOS through CDXL.datatype which allows playback of CDXL files on compatible Amiga computers.

Usage

A number of Amiga CD-ROM games and entertainment software from the era used CDXL for motion video.

Performance

Playback was moderately impressive at the time of release given the CDTV's Motorola 68000 processor, OCS chipset and single-speed CD-ROM drive. A single-speed (150 kB/s) CD-ROM drive permitted resolutions equivalent to 160×100 with 4,096 colors at 12 FPS with 11025 Hz 8-bit mono audio. At these settings audio and visual quality would be perceived as considerably worse than VHS.

A CDXL stream at 300 kB/s (equivalent to 256×128 at 12 FPS) allows approximately 36 minutes of video to fit on CD-ROM. In comparison, a Video CD encoded in MPEG-1 format allows approximately 72 minutes of 384×280 24-bit color video at 25 FPS [http://ninjaw.ifrance.com/cd32/_docs/cdxl/cdxl.html] .

References


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