Questions about the accuracy of the spec

Hello,

I have three questions, though all of which already mentioned by other peop=
le in the mailing list, =

about the accuracy of the Vorbis I Specification published on Feb 27.

1. On page 34 section 4.3.4., explanation of the situation where there are =
only one submap is omitted,
and it is difficult to understand that the decoder should assume in such ca=
ses that all the audio channels belong to submap #0 in the original order w=
ithout
examining the array [vorbis_mapping_mux] (which is empty).

2. On page 58 section 8.5., it is unclear as to which of the following impl=
ementation is correct:
=A0 A. For each partition, decode a vector the size of [partition_size] * [=
ch] according to Format 1 and deinterleave. Repeat the process over all par=
titions. (wrong)
=A0 B. Decode a single vector the size of [blocksize / 2] * [ch] according =
to Format 1 and deinterleave once. (correct)

3. On page 60 section 8.6.2., taking the greater of [residue_begin] and [ac=
tual_size] will almost always produce [actual_size], which does not make se=
nse.
=A0 Taking the lesser of [residue_begin] and [actual_size] as [limit_residu=
e_begin], and the lesser of [residue_end] and [actual_size] as [limit_resid=
ue_end] seems correct.

I came across the questions above in the course of writing a new decoder wh=
ich is almost working properly,
(https://github.com/sohc1300/Soyogi)
and I am quite certain that it would be very nice if these points are clari=
fied by official documentation.

Please excuse me if there are any misuse of English, as I am not used to.

Regards,
Hiroka
--
Hiroka Ihara
Department of Information and Communication Engineering, the University of =
Tokyo
PC: [email protected]
 		 	   		  =