Projects » Voice Over IP
Video/Audio Streaming: Domain Expertise
H.323 - standard for video conferencing and point to point communications.
T.120 - Real time data conferencing protocol
Call signals and controls
- H.323 - Packet-based multimedia communications systems
- H.225 - call control protocol
- H.235 - security
- H.245 - media control protocol
- Q.931 - digital subscriber signaling
- H.450.1 - Generic functional protocol for the support of
supplementary services in H.323
Voice Over IP:
SIP, H.323.
Audio Codecs, Compression Algorithms
- PCM audio codec 56/64 kbps
- G.722 - audio codec for 7 Khz at 48/56/64 kbps
- G.723.1 - speech codec for 5.3 and 6.3 kbps
- G.728 - speech codec for 16 kbps
- G.729 - speech codec for 8/13 kbps
- Windows Media Audio (WMA), MP3
Video codecs
- H.261, H.263, H.264 (MPEG4 Part 10)
- MPEG-2, MPEG-4
- Windows Media Video (WMV)
Software APIs, libraries
- Open H.323
- Microsoft Video for Windows, DirectShow, DirectX
Voice IP Case Studies:
Security Access Control System
SolovatSoft designed and developed a proprietary, state-of-the art system that integrates the latest in security and access control technology to provide non-doorman buildings in New York City with the security and convenience of a doorman at a fraction of the cost. Customer is a leading provider of videoconferencing systems, peripherals, installations and custom integration, growing at a rapid rate and currently planning to fund expanding business by initial public offering on one of the major stock exchanges.
Codec Development and Porting
The developed codec is a plug-in solution for Windows and Windows Mobile
platforms ranging from Desktops, to notebooks to Pocket PC’s/PDAs. This
plug-in solution allows users to encode voice files with the Windows /
Windows Mobile based Sound Recorder applications, and can decode the files
using players such as Windows Media Player. SolovatSoft also performed
audio Player porting from Windows to Windows mobile platforms.
Video conferencing software.
The client/server software is intended for business and
entertainment use. Software has two units - Windows/MAC client
application and Windows/Unix server multipoint control unit (MCU)
application. The video streams handled by server are distributed
to the clients based on the demand. Clients may communicate with
each other using a video conference chat room.
TV Tuner Project
XShift TV Tuner application is the fully DirectShow compliant
software for PC with the MS Windows. This application provides the
playback, recording and trimming of TV video programs video (that
are stored in file buffer), which is received by PC TV tuner.
Simple sliding control enables video playback (for TV program)
that was received before. Time to store video depends on several
parameters such as: predefined buffer size, size of output video,
compression quality etc.
Reverse Bitmap Filter
Reverse Bitmaps is a DirectShow filter designed for reversing
frames in the MPEG-1, MPEG-2 Streams. It was designed for playing
back MPEG-1, MPEG-2 files in reverse order - from back to front.
It is fully compatible with Moonlight-Elecard MPEG2 Video Decoder,
Video Renderer, Overlay Mixer, Video Mixing Renderer 7 and Video
Mixing Renderer 9.
IP-telephony system
SolovatSoft developed a software-hardware complex for making encrypted Internet calls to and from PSTN (Public Switched Telephony Network). Was used the following PC based hardware: PhoneJack and LineJack produced by QuickNet (USA).
This system is especially attractive for small/medium businesses as it requires minimal investments in hardware, most of which is standard inexpensive PC hardware. Nevertheless, the deployment of the standard ITU H323 protocol stack enables scalability needed to satisfy the demands of larger businesses.
Technologies used: C++ for Windows and Linux, OpenH323 (www.openh323.org), OpenSSL (www.openssl.org)
