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Xiph.Org
Opus
Commits
4667b699
Verified
Commit
4667b699
authored
8 years ago
by
Jean-Marc Valin
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updating update draft
parent
38688317
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doc/draft-ietf-codec-opus-update.xml
+22
-2
22 additions, 2 deletions
doc/draft-ietf-codec-opus-update.xml
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2 deletions
doc/draft-ietf-codec-opus-update.xml
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4667b699
...
...
@@ -10,7 +10,7 @@
<?rfc inline="yes"?>
<?rfc compact="yes"?>
<?rfc subcompact="no"?>
<rfc
category=
"std"
docName=
"draft-ietf-codec-opus-update-0
3
"
<rfc
category=
"std"
docName=
"draft-ietf-codec-opus-update-0
4
"
ipr=
"trust200902"
>
<front>
<title
abbrev=
"Opus Update"
>
Updates to the Opus Audio Codec
</title>
...
...
@@ -47,7 +47,7 @@
<date
day=
"1"
month=
"
Septem
ber"
year=
"2016"
/>
<date
day=
"
2
1"
month=
"
Octo
ber"
year=
"2016"
/>
<abstract>
<t>
This document addresses minor issues that were found in the specification
...
...
@@ -276,6 +276,26 @@ silk_ADD_SAT16( NLSF_Q15[i-1], NDeltaMin_Q15[i] ) );
</section>
<section
title=
"Cap on Band Energy"
>
<t>
On extreme bit-streams, it is possible for log-domain band energy levels
to exceed the maximum single-precision floating point value once converted
to a linear scale. This would later cause the decoded values to be NaN,
possibly causing problems in the software using the PCM values. This can be
avoided with the following patch to line 552 of celt/quant_bands.c:
</t>
<figure>
<artwork>
<![CDATA[
{
opus_val16 lg = ADD16(oldEBands[i+c*m->
nbEBands],
SHL16((opus_val16)eMeans[i],6));
+ lg = MIN32(QCONST32(32.f, 16), lg);
eBands[i+c*m->nbEBands] = PSHR32(celt_exp2(lg),4);
}
for (;i
<m->
nbEBands;i++)
]]>
</artwork>
</figure>
</section>
<section
title=
"Hybrid Folding"
anchor=
"folding"
>
<t>
When encoding in hybrid mode at low bitrate, we sometimes only have
enough bits to code a single CELT band (8 - 9.6 kHz). When that happens,
...
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