diff options
| author | Jean-Marc Valin <jean-marc.valin@octasic.com> | 2010-07-08 21:40:07 +0400 |
|---|---|---|
| committer | Jean-Marc Valin <jean-marc.valin@octasic.com> | 2010-07-08 21:40:07 +0400 |
| commit | 4468c75adbefed247ae592e42549da544f468277 (patch) | |
| tree | e95a37dac0ef4604085330f491b109cc4c5a3248 /doc | |
| parent | ed8e1b49370e39b776930918e5d5f7d6408c1a3c (diff) | |
draft update, instructions
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/draft-valin-codec-prototype.xml | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/doc/draft-valin-codec-prototype.xml b/doc/draft-valin-codec-prototype.xml index 8ebda971..4a16a228 100644 --- a/doc/draft-valin-codec-prototype.xml +++ b/doc/draft-valin-codec-prototype.xml @@ -2,7 +2,7 @@ <!DOCTYPE rfc SYSTEM 'rfc2629.dtd'> <?rfc toc="yes" symrefs="yes" ?> -<rfc ipr="trust200902" category="std" docName="draft-valin-codec-prototype-00"> +<rfc ipr="trust200902" category="std" docName="draft-valin-codec-prototype-01"> <front> <title abbrev="Codec Prototype">Prototype for IETF Interactive Audio Codec</title> @@ -39,7 +39,7 @@ </author> -<date day="5" month="July" year="2010" /> +<date day="8" month="July" year="2010" /> <area>General</area> @@ -107,6 +107,17 @@ of the (now expired) <xref target="CELT">CELT Internet-Draft</xref>. The main changes include better support for 20 ms frames as well as the ability to encode only the higher bands using a range coder partially filled by the SILK layer.</t> + +<t> +In addition to their frame size, the SILK and CELT codecs require +a look-ahead of 5.2 ms and 2.5 ms, respectively. SILK's look-ahead is due to +noise shaping estimation (5 ms) and the internal resampling (0.2 ms), while +CELT's look-ahead is due to the overlapping MDCT windows. To compensate for the +difference, the CELT encoder input is delayed by 2.7 ms. This ensures that low +frequencies and high frequencies arrive at the same time. +</t> + + <section title="Source Code"> <t> The source code is currently available in a @@ -284,7 +295,10 @@ in encoders are typically rarer, the same applies to the encoder. Malicious audio stream must not cause the encoder to misbehave because this would allow an attacker to attack transcoding gateways. </t> - +<t> +In its current version, this prototype codec likely does NOT meet these +security considerations, so it should be used with caution. +</t> </section> @@ -294,12 +308,12 @@ This document has no actions for IANA. </t> </section> -<!-- <section anchor="Acknowledgments" title="Acknowledgments"> <t> +Thanks to all other developers, including Soeren Skak Jensen, Gregory Maxwell, +Christopher Montgomery, Karsten Vandborg Soerensen, and Timothy Terriberry. </t> </section> ---> </middle> |