>I am actually setting up a robust MP3 rtp streaming server for a large firm
>in Europe.
>I am very interesting in Freeamp because it is open source and run on
>Windows as well as Linux.
My message to this mailing list (from last January) may be relevant here.
By the way, some other MP3/RTP players that can read SDP files are
- Winamp (with the "in_rtp.dll" plugin:
<http://www.live.com/multikit/winamp-plugin.html>)
- RealOne Player
----------------------------------
I have modified the recent Freeamp 2.1.1 source code release to make use of
the "LIVE.COM Streaming Media" libraries (see <http://live.sourceforge.net/>).
The major changes in the code were to "io/obs/obsinput.{h,cpp}". These now
use the RTP/RTCP implementation from the LIVE.COM libraries, rather than
the (limited) RTP implementation that was there before. This brings many
benefits:
- There is now full RTCP support. (In particular, Freeamp will
now send
back RTCP Reception Reports when playing a RTP session.)
- Freeamp now supports loss-tolerant MP3/RTP streams (as defined in
RFC 3119), as well as traditional MP3/RTP streams as defined in
RFC 2250.
- For even greater loss tolerance, Freeamp can now also receive
sessions
that use 'layered erasure coding' - i.e., using multiple RTP
streams,
encoded at different bit rates (using a technique developed by
Multicast Technologies, Inc.). (For more information about
this, see
<http://www.live.com/multikit/winamp-plugin.html#mct-slap>, which
describes how such session can be described using 'rtp://'
pseudo-URLs.)
- Freeamp now accepts "rtsp://" URLs (for those MP3/RTP sessions
(unicast or multicast) that are served by RTSP servers.
- As an alternative to using "rtp://" or "rtsp://" URLs to play a
MP3/RTP
session, Freeamp can also read a ".sdp" file that describes such
sessions
(using the IETF's "Session Description Protocol" - RFC
2327). (At present
this works only if the ".sdp" file name is given on the command line.)
- By using the LIVE.COM libraries, Freeamp now has the potential to
support many additional RTP payload formats - if a decoder is
present.
For example, with an appropriate decoding implementation Freeamp
could
now support PCM (u-law or a-law), GSM, QCELP, etc. etc. RTP streams.
In addition to the changes to "io/obs/obsinput.{h,cpp}", there were also
minor changes to a handful of other files - mainly to recognize "rtsp://"
URLs and ".sdp" files as special cases. Plus, of course, I updated
"Makefile.header.in" and "Makefile-plugins.in" to reference the "LIVE.COM
Streaming Media" headers.
I have left my updated copy of the Freeamp code online as
<http://www.live.com/mct/freeamp+live.tgz>. There is also a patch file:
<http://www.live.com/mct/freeamp+live.patch>, and a pre-built Linux/x86
binary: <http://www.live.com/mct/binaries/linux-x86/freeamp>.
To build this from source, you will also need the "LIVE.COM Streaming
Media" code (available from <http://live.sourceforge.net/>), unpacked into
a directory "live" (with "freeamp" and "live" being siblings in the file
hierarchy).
It would be great if these modifications could be incorporated into the
official Freeamp code base, as they are significant improvement over the
original code.
Ross Finlayson
LIVE.COM
<http://www.live.com/>
_______________________________________________
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