Silverlight 4 Audio Compression

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+1 Q:

Silverlight 4 Audio Compression

Any suggestions on how to implement Compression of captured Audio in a Silverlight 4 Application? I'd prefer something lossy like MP3 or AAC but after my intial research only turned out one lonely pure C# FLAC encoder/decoder, anything better than this would be nice.

Please note that sending uncompressed audio to the server and compress it there is not an option because of a) traffic cost and b) the audio is additionally encrypted by the client so the server never sees the source material.

Does it have to be C#? LAME is a pretty good, very configurable MP3 encoding library.

http://lame.sourceforge.net/

Phill 2010-09-07 20:50:48

Using Lame invokes PInvoke which in turn requires elevated permission and OOB execution of silverlight applications so that not an option.

Oliver Weichhold 2010-09-08 05:12:42

+1 A:

I don't know of any implementations of proprietary compression algorithms in C#. You pretty much would have to implement your own. ADPCM is silmple and offers 4:1 compression ratio. More on the subject: http://forums.silverlight.net/forums/p/145729/374278.aspx

Denis 2010-09-07 22:18:51

Yes I know. The Problem with ADPCM is that its only 4 Bit per Sample.

Oliver Weichhold 2010-09-08 05:13:17

Thanks anyway for your answer because it got me thinking again about Speech Codecs and I discovered this: http://cspeex.codeplex.com/

Oliver Weichhold 2010-09-08 05:44:43

ansaurus

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