Visual Circuits Harmony 4E, User Manual

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Overview
2
Audio/Video Distribution
There are two options for audio/video distribution. None of these
devices are powered and follow all standard audio/video cabling
procedures.
1. Universal Cable: This cable supports all board configurations
and comes as a 16-inch cable which attaches to each board’s
DB 25. All output connectors are RCA female type, requiring
appropriate adapters and patch cables.
2. Audio Cables: Cables with 1/8 inch (3.5 mm) stereo phone
plugs to two phono (RCA) plugs may be used to connect the
Harmony 4E digital audio outputs to an external audio
receiver/decoder. The output labeled “CH1/2” is designated for
channels 1 & 2 and the output labeled “CH3/4” is designated
for channels 3 & 4. (Note: Visual Circuits does not carry cable
adapters and accessories, see page 36 for details).
Application Interface (API) for the
Harmony 4E
The source code for the Harmony Vidserve demo program is
provided for developers as an example of how to access the driver.
The current version of the driver uses a proprietary C API interface
(instead of a standard interface like MCI or Direct Show).
Applications can use the driver by calling the dynamic link library
(4REELAPI.DLL). The files needed (4REELAPI.LIB and
4REELAPI.H) are provided in the Vidserve.ZIP file, along with
the source code and MS VC++ 6.0 project makefile for Harmony
Vidserve. 4REELAPI.H declares all of the functions available in
the driver library. (See the Harmony SDK manual for more info.).