[vorbis-dev] slightly different audio output

[Daniel B. Miller]

this is a common problem with Intger decoders.  Looking at absolute
differences is educational but not very conclusive.  There are more
complex frequency-domain tests you can do (ie rate/distortion within
frequency bands...)

How does it sound?

<p> ___  Dan Miller
(++,) CTO and founder, On2 Technologies

On Fri, 5 Apr 2002, Pattara Kiatisevi wrote:

> Hi,
>
> I wonder if there is specific requirement or restriction for the decoder
> in order to be consider "Vorbis" compliant (or let's say, to be a
> "correct" vorbis decoder). I am experimenting with integerized libvorbis
> and the decoder delivers the audio data as following, (and compare with
> the floating point version below).
>
> $ tail audioout-int.txt
> 0290670 025e 085c 02cf 0895 0349 08b2 039e 087d
> 0290680 03ab 07df 03a0 0738 03de 06d6 0458 069f
> 0290690 04f2 066b 05c3 061a 069d 05cd 0784 057b
> 02906a0 0865 052e 095d 050e 0a46 04f2 0b0e 04f2
> 02906b0 0bd0 0505 0c9c 0552 0d48 059f 0dd7 05ec
> 02906c0 0e88 0675 0f77 0747 1045 07ec 10b0 083f
> 02906d0 1111 0895 1190 0927 11e4 09a8 1243 0a17
> 02906e0 12fb 0ab7 1395 0b18 13f6 0b3b 144e 0b22
> 02906f0 149c 0ab8 14a9 09e6 1509 093d 14a6 07ff
> 0290700
>
> $ tail audioout-float.txt
> 0290670 0262 0860 02ee 08a1 0377 08c5 03bc 0884
> 0290680 03c7 07ea 03be 073c 03d8 06c0 0459 0697
> 0290690 0506 0664 05bf 0606 06bd 05c6 07b6 0583
> 02906a0 0883 0528 097d 0505 0a71 04f9 0b23 04dc
> 02906b0 0beb 0502 0cc6 0564 0d6b 05aa 0df6 05eb
> 02906c0 0eb4 067a 0fad 0754 1072 07f8 10da 0846
> 02906d0 114e 08b1 11c8 093f 121c 09b8 128d 0a3d
> 02906e0 1318 0ac0 1396 0b20 141d 0b5e 1477 0b3c
> 02906f0 14a0 0aaf 14d1 09f1 14cb 08ed 14a4 07dd
> 0290700
>
> In theory, must they deliver exactly the same audio output or some
> errors are tolerable.
>
> Thank you very much,
> Pattara
>
> --
> Please avoid sending me Word or PowerPoint attachments.
> See http://www.fsf.org/philosophy/no-word-attachments.html
> ----------------------------------------------------------------------
> Ott Pattara Kiatisevi 				   T L W G
> M.Sc. INFOTECH Student, Stuttgart, Germany	http://linux.thai.net/
> ----------------------------------------------------------------------
>
>
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