[Mp4-tech] Optimized AAC-LC

[Alfred]

Hi all,
 Could anyone pl tell the Memory/MIPS requirements  of
the best optimized MPEG4 AAC-LC Decoder( stereo
output) available on date.
Ralph, could you also please throw some light on the
fundamental limits on Memory/MIPS on the above
decoder.
Alfred
--- Ralph Sperschneider
<ralph.sperschneider iis.fraunhofer.de> wrote:
> lisa wrote:
> 
> > Hi Ralph,
> >           I did not check the reference decoder
> software of ISO. I
> > checked with faad2-0.
> > 
> > As I earlier mentioned for the files am02_32.mp4
> to am02_96.mp4 there 
> > are  small glitches that are coming on the right
> channel(in the faad code).
> > 
> > Can u please tell where the things CAN go wrong in
> that code?
> > In the sense that which part of the decoder is
> being tested in that  
> > particular set of test vectors?
> > In which module the problems can possibly occur
> and for what possible  
> > reason?
> > What are the things that affect the decoding of
> the right channel?(in 
> > the  sense that the left channel decodes properly)
> > 
> > Thanks in advance
> > With regards
> > Lisa.
> > 
> > 
> > 
> > On Tue, 07 Sep 2023 11:48:01 +0200, Ralph
> Sperschneider  
> > <ralph.sperschneider iis.fraunhofer.de> wrote:
> > 
> >> lisa wrote:
> >>
> >>> Hi all,
> >>>      I have doubt on the MPEG4AAC  main profile
> (audio) While 
> >>> decoding  the  test vectors
> >>>         am02_32.mp4  to  am02_96.mp4
> >>>     There are some small glitches coming on the
> right channel. I 
> >>> guess  thats  why the RMS test     fails.
> >>>     Can anyone help on that problem? Remaining
> all test vectors are  
> >>> passing.
> >>>  thanx in advance
> >>> lisa
> >>
> >>
> >>
> >> Hi Lisa,
> >>
> >> the current MPEG-4 Audio reference software
> decoder has no problems 
> >> with  these sequences. Which decoder are you
> using?
> >>
> >> Best regards,
> >>
> >> Ralph
> >>
> > 
> > 
> > 
> 
> Hi Lisa,
> 
> I am not familiar with faad. I even cannot see
> something special which applies 
> only to these sequences. The sequence was intended
> to test as many different 
> Huffman codewords from the spectrum Huffman
> codebooks as possible (that is 
> called "arithmetic torture" in ISO/IEC 14496-4).
> Maybe some seldom used Huffman 
> codes (eventually with some escape sequences) are
> not correctly decoded by the 
> faad ... just a guess.
> 
> Best regards,
> 
> Ralph
> 
> -- 
> Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131
> 776 344
> Fraunhofer IIS                  | Fax:   +49 9131
> 776 398
> Am Wolfsmantel 33               |
> mailto:ralph.sperschneider iis.fraunhofer.de
> D 91058 Erlangen                |
> http://www.iis.fraunhofer.de/amm/
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