[Mp4-tech] [Mpeg4 AAC] regarding PNS block in Mpeg4 AAC decoder

[Ralph Sperschneider]

Shreya Pathak wrote:
>Hi Ralph, 
>    I have developed reference software for Mpeg4 AAC LC Decoder and i have downloaded the test vectors from this site.
>http://www.tnt.uni-hannover.de/project/mpeg/audio/
>and here i am able to pass all the test vectors except for PNS.
>  
>
You should download the sequences from here:
ftp://mpaudconf:adif2mp4@ftp.iis.fraunhofer.de/
>al18_08.mp4 and al19_08.mp4 are not passing.I get different values as compared to the reference output given in al18_08.wav and al19_08.wav
>  When I decoded the same test vectors using the publicly available source code faad, there also its giving a difference between values.
>So I am not able to compare also where am I wrong ?
>  
>
You should follow the conformance test procedure as outlined in ISO/IEC 
14496-4. Note that special tests are defined for PNS testing. It should 
be obvious that a sample by sample comparison is meaningless if random 
generators are used on decoder site.
Ralph
-- 
Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
Fraunhofer IIS                  | Fax:   +49 9131 776 67 344
Am Wolfsmantel 33               | mailto:ralph.sperschneider iis.fraunhofer.de
D 91058 Erlangen                | http://www.iis.fraunhofer.de/amm/