17 Apr
2003
17 Apr
'03
6:55 p.m.
I am trying to use madplay (ver 0.14.2b) to decode a layer II bitstream (generated by toolame - http://sourceforge.net/projects/toolame). I get an occasional error message: bad scalefactor index
After a little poking around, I see that libmad/layer12.c generates this message around line 172, when it reads a scalefactor index of 63.
This appears to be an ambiguity in the spec: as far as I can see, 11172-3 just says to use the 6-bit scalefactor as an index into table B.1, but B.1 is only defined for 0-62.
Toolame appears to add an extra entry to B.1 that maps 63 to 0.0, and mpg123 seems to do the same thing. Is there any reason not to follow the same convention in mad?
Joe R. http://www.rothweiler.us