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How to Interpret MPEG streaming Audio files

Posted on 2006-07-20
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Last Modified: 2012-06-27
I have captured an MPEG2 Streaming Audio File and I need to interpret the file with respect to Packets and headers, etc.
All I know for sure at this point is that the following sequence shows up every 0x240 (576 decimal) bytes = "FF FF FF FF FF FF FF FF".

Can anyone point me to a definition for the MPEG2 format to help understand the format of the file?

Thanks
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Question by:Finch
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7 Comments
 
LVL 11

Expert Comment

by:vo1d
ID: 17152785
there exists two different types of mpeg2 audio, aac and multichannel.
aac is not backward compatible to mpeg1 audio, multichannel is.
excample and docs for an encoder / decoder can be downloaded here. the source is coded in c.
http://standards.iso.org/ittf/PubliclyAvailableStandards/c039486_ISO_IEC_13818-5_2005_Reference_Software.zip

the official moving picture experts group site can be found here:
http://www.chiariglione.org/mpeg/

what do you try to do with your code? do you wanna make a mpeg2 decoder?
if so you should change to a different programming language, c# will not fast enough for that.
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Author Comment

by:Finch
ID: 17168881
Actually I'm not building a decoder. I'm just trying to understand the contents and format of an MP2 streaming audio file. All I know for sure is that every 0x240 bytes there is a string of eight "FF"s in a row and a few other bytes look like formatting data then a lot of compressed audio data. Do you know of any file format definitions?
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Accepted Solution

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vo1d earned 500 total points
ID: 17169304
take a look at this definition:
http://www.dv.co.yu/mpgscript/mpeghdr.htm
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Author Comment

by:Finch
ID: 17172344
You are my hero (except for your interesting photo). This definition is exactly what I needed.... Thanks
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Expert Comment

by:vo1d
ID: 17176123
mmh, which photo?
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Author Comment

by:Finch
ID: 17176246
Sorry, I was looking at a rather weird photo at the side of the Experts Exchange screen. The photo is for Gregory Young, I just now realized it's not yours.... good thing. Thanks again for your help.
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Expert Comment

by:vo1d
ID: 17176259
ah, ok ;)
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