[Live-devel] MPEG-4 Visual configuration bits in SDP

[Ross Finlayson]

>Just came across that it would be useful to have an easy-to-use 
>decoder for MPEG-4 Visual configuration bits that are encoded in 
>"config" parameter of SDP. Something like mpeg4vol command-line tool 
>from mpeg4ip does. Are there any plans to implement this in the 
>future?

The 'config' parameter string is simply a string of bytes, encoded as 
hexadecimal digits (therefore, two hexadecimal digits per byte).  We 
do have a function:
	parseGeneralConfigStr()
(defined in "liveMedia/include/MPEG4LATMAudioRTPSource.hh) that will 
convert a 'config' string to binary.  E.g., the 'config' string
	deadbeef
would be converted to the following sequence of 4 bytes
	0xDE 0xAD 0xBE 0xEF

However, we don't implement any additional 'decoding' of this data 
(or any other MPEG-4 data), because it's not needed at all for 
streaming.  (We don't include any audio/video decoding or encoding 
software.)
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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