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The release of the code marks the first in a series of open source products that the company plans to offer under its initiative known as Helix. Within the next year it is expected to release an open source media server as well as freely available technology to encode audio and video files.
The Helix DNA Client, which will be available on the Web from today (29 October), is an open source version of the engine that powers the company's commercial RealOne Player. It can be built into devices as diverse as mobile phones, set-top boxes, home audio receiver and PCs so that users can stream and play back digital media on those devices
Initially, the company will ship the code required to build players that can be compiled to run on desktop operating systems from Microsoft, Apple Computer and the Linux community. With some tuning the code can be modified for other operating systems such as those from Symbian, PalmSource and Wind River Systems.
"We actually are going to allow people to build essentially their own version of the RealOne Player," said Dan Sheeran, vice-president of media systems at RealNetworks. "You can grab this code and port it to your platform as quickly as you want," he said.
RealNetworks is betting on the open source development model to establish its media formats and related technology as a de facto standard for streaming and playing back media on PCs and other devices. RealNetworks competes against Microsoft and Apple, who also make media players and server technology based on their respective file formats.
Along with the release of the Helix DNA Client source code, RealNetworks disclosed that it will give developers free access to its prized compression and decompression technology, or codec, so that open source players built with the Helix code will be able to play back RealAudio and RealVideo files.
The company will not distribute the source code for its codecs. Instead, it will distribute compiled versions of the software for each operating system supported, Sheeran said.
"We were unclear before as to whether we were going to allow [free] use of the format," Sheeran said. "People will be pleasantly surprised at how liberal we're being," he said.
Some open source developers initially criticised the company for not offering free access to its codecs as part of the open source initiative, which was first announced in July. Without such access, developers would have been able to build a free media player but would have had to pay royalties in order to allow the playback of Real media files on their players.
"In the beginning there was a lot of protest about the licensing agreements they came out with," said Max Flisi, research analyst with IDC, noting that the alterations to the licensing structure will probably quell earlier concerns. "RealNetworks wants to make it as easy and cost effective as possible for companies to use this," he said.
Without any modification, players built with the Helix DNA Client will support RealAudio and RealVideo, MP3, MPEG-4 (Moving Picture Experts Group), the standard low bit rate video codec H.263, and 3GPP (3rd Generation Partnership Project), a file format used by the mobile phone industry.
One highlight to RealNetworks' original announcement was that it had developed a technology that would allow files encoded in the Windows Media formats to be delivered over the Internet using the Helix media server and played back on the free client software. That technology will not be included in the current release. Real hopes that developers will begin projects among themselves in order to add such support.
RealNetworks will release the source code under two licences. One is an open source licence allowing individual developers and universities to freely build versions of the media player for non-commercial use. The Open Source Initiative is submitting that licence for certification.
A second, commercial licence will be available for organisations that develop players for commercial purposes. Under that scenario companies will receive free licensing for the first million units shipped annually and pay $0.10 per unit beyond that.
"The intention there is to facilitate both non-commercial and commercial uses," Sheeran said. "If you want to ship millions of copies that's not going to be free."
Acers, Hitachi, STMicroelectronics and Nokia have said they will back the Helix effort by implementing the technology in various computing and consumer electronics devices they ship.
The open source effort has received an overwhelming response from developers and manufacturers since it was first announced, according to RealNetworks. Roughly 2,000 developers have registered to be members of the Helix community, which includes access to the source code and development tips, according to the company.
Initial projects to be taken on by the Helix developer community include creating a player for the Palm operating system and plug-ins for the Mozilla and Opera Web browsers, Sheeran said.