Hello!

I am having some problems finding the correct values for some calculations. For the frame size, I use the following formula:



Here is a table with the coefficient values I use:



For the duration, here is my formula:



And here is my table with the sample sizes:



In "amiga_mpega.c" however, I found the following:



As you can see, the MPEG 2(.5) Layer 1 value is 384 and not 192 as I suppose.

Could someone please tell me what the right values are?

Regards,
Sebastian Mares

One more thing... Do you know if the Xing / VBRI "size" information counts the Xing / VBRI tag itself?

I have no definitve answer to your questions. Did you have a look at different decoders to see how they handle that? I can recommend amp11 by Niklas Beisert, the sources are quite easy to understand and have been very helpful for me when I wrote my own MPEG audio decoder some years ago.

Decoding engines source codes @ mp3-tech.org
Amp11Lib (sources and binaries)


Edit: of course you should also look at the MAD sources, since it is considered "the best" decoder by a lot of people.

The problem is that most decoders I tried can only handle MP2 and MP3, not MP1.

I will have a look at the pages you posted.

OK, it seems that for Layer 1, the coefficient is 48 in both MPEG versions and the sample size is 384, again, in both versions.