Dear Torsten,
> I stumbled across some differences in chapter 2.4.1.7 (decoding)
> where "dist10" does not decode main_data() as described in
> ISO-11172-3. I wonder where this difference comes from and to
> which one i should comply.
As far as I know, dist10 does comply exactly with ISO 2.4.1.7
May be you could describe in some more detail where you see the differences.
> One more thing is the CRC, in dist10 the CRC is applied to the single
> bits of the header and so on. Can i just calculate the CRC over all
> data in the frame (except the two bytes of the CRC in the header)?
The CRC is computed only for the "important" bits. This saves time in computing
and checking the crc. Which bits are important is given in detail in the
standard.
> Are there some test MP3-data available for decoders? Some data that
> i can use to test if a decoder complies to MP3?
There is some test data, that can be used to check some aspects of decoding mp3,
mainly numerical accuracy. These tests are freely available on the net and
are described in iso 11172-4 part 4 compliance checking. (There is little
use in buying part 4 of the standard, get it from a library.)
Yours
Martin Ruckert
-------------------------------------
Prof.Dr.Martin Ruckert
Munich University of Applied Sciences
FB07 Mathematics and Computer Science
Lothstrasse 34
D-80335 Munich
GERMANY
_______________________________________________
mp3encoder mailing list
mp3encoder@minnie.tuhs.org
https://minnie.tuhs.org/mailman/listinfo/mp3encoder
