[Mp4-tech] Optimized AAC-LC
Alfred
jone96_us yahoo.com
Sun Sep 12 01:35:34 EDT 2004
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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