Audio Broadcast and broadcast research

Today's audio broadcast and broadcast, especially live broadcast technology to achieve mature is basically need to buy, whether domestic or foreign technology companies. They will help you out with a complete solution, design the overall architecture, and even hardware devices. Of course the price is relatively expensive, then the question comes, how to build free, easy to use radio?

IceCast

http://www.icecast.org/official Address

Icecast is an open source free is multimedia server, mainly supports Ogg,mp3 audio files.

Logical diagram

sourceclient is a data acquisition source, can be implemented with Ices/liveice/darkice, and can also be implemented directly using third party open source apps. Supported platforms Linux/unix, Mac OS X, Windows,android,ios

Portal http://www.icecast.org/apps/

Icecastserver is delivered to the distributor Audiostream (audio stream) for distribution, and can be streamed, on-demand.

Network topology structure

The figure can be understood, support multiple channel channels, channel signal and Internet through CABLE/DSL unicom, in order to be able to achieve load balance, can establish multiple Icecast Relay (mount point).

The key point is to understand the schema of the live broadcast, if the project wants to quickly build a live service, the focus of research is

1. The choice of sourceclient, the determining factor is the data source collection method, is through the PC also mobile

2. Icecast server configuration, in the Icecastserver installation directory/etc/icecast.xml very nice to understand

Next is the audience device implementation, can be computer, mobile phone, tablet, car equipment, simply speaking, as long as there is a network card, can handle the flow of the system, plus speakers can listen to the radio completely.

There are other issues to consider when building this architecture.

1. Live broadcast OK, on-demand to buy/share programs, related to copyright issues, technical if the other side with the Ogg format, you do not support, a lot of conversion work will be done. So you need to think about supporting common audio formats like Mp3,ogg and so on.

2. Live and on-demand sub-server to do, because on-demand directly through the HTTP download is OK. Of course it can be combined together, Icecastserver is also supported.

3. Load balancing problems, such as having 10W viewers listening at the same time, can build multiple channel, such as 10. Each allow the maximum number of links to 1W, so that the pressure will be reduced sharply.

Audio Broadcast and broadcast research