Audio and video stream management engine for telecommunications
An open-source software developed in France since 2001
Software Architecture
Mediastreamer2 is a powerful and lightweight streaming engine designed for voice and video telephony applications.
This open-source library handles the reception and transmission of all multimedia streams in Linphone, including voice/video capture, encoding, decoding, and rendering.
Mediastreamer2 integrates the oRTP library, which implements the Real-Time Transport Protocol (RTP – RFC 3550).
Design and Principles
Each processing entity is contained within an object called MSFilter. MSFilters have inputs and/or outputs that can be used to connect them to other MSFilters.
A simple example can illustrate this:
- MSRtpRecv: An MSFilter that receives RTP packets from the network, unpacks them, and posts them to its single output.
- MSSpeexDec: An MSFilter that takes everything from its input (Speex-encoded packets), decodes it, and places the result on its output.
- MSFileRec: An MSFilter that takes everything from its input and writes it to a WAV file (assuming the input is 16-bit linear PCM).
MSFilters can be connected together to form a chain of filters. For instance, connecting the three examples above creates a processing chain that receives RTP packets, decodes them, and writes the uncompressed results to a WAV file:
MSRtpRecv –> MSSpeexDec –> MSFileRec
The execution of media processing is scheduled by an MSTicker object, a thread that wakes up every 10 ms to process data in all MSFilter chains it manages. Multiple MSTickers can operate simultaneously, for example: one for audio filters, another for video filters, or even one per processor on the machine it’s running on.
Source code
Via Gitlab
Compilation via Git
| Project | Git Repository |
| Mediastreamer2 | git clone https://gitlab.linphone.org/BC/public/mediastreamer2.git |
| oRTP | git clone https://gitlab.linphone.org/BC/public/ortp.git |
Documentation
Supported Features and Standards
Version History
ORTP API Documentation
Licensing model
Mediastreamer2 is available under a dual-license model.
You can choose between an open-source license or a proprietary license. Our proprietary licenses grant you the right to modify the source code while keeping your changes closed.
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