[xiph-commits] r12929 - trunk/vorbis/doc
lu_zero at svn.xiph.org
lu_zero at svn.xiph.org
Tue May 8 01:22:20 PDT 2007
Author: lu_zero
Date: 2007-05-08 01:22:19 -0700 (Tue, 08 May 2007)
New Revision: 12929
Modified:
trunk/vorbis/doc/draft-ietf-avt-rtp-vorbis-04.txt
trunk/vorbis/doc/draft-ietf-avt-rtp-vorbis-04.xml
Log:
Yet another change in the headers packing, in practice nothing changes if you use a dummy comment header ( 2| 30| 28| ident| comment| setup| ) but should be flexible enough to be used for other codecs or evolutions of vorbis
Modified: trunk/vorbis/doc/draft-ietf-avt-rtp-vorbis-04.txt
===================================================================
--- trunk/vorbis/doc/draft-ietf-avt-rtp-vorbis-04.txt 2007-05-08 01:28:44 UTC (rev 12928)
+++ trunk/vorbis/doc/draft-ietf-avt-rtp-vorbis-04.txt 2007-05-08 08:22:19 UTC (rev 12929)
@@ -466,13 +466,15 @@
specification [12], the identification and the setup MUST be packed
together as they are, while the comment header MAY be replaced with a
dummy one. The packed configuration follows a generic way to store
- xiph codec configurations: the first byte stores the number of
- following packets minus one, the next bytes represent the size of the
- packets, every byte set to 0xff means that the next byte has to be
- add to the current sum in order to have the complete size; the
- headers immediately follows the list of sizes. The headers are
- packed in the same order they are present in ogg: identification,
- comment, setup.
+ xiph codec configurations: The first field stores the number of
+ following packets minus one (count field), the next ones represent
+ the size of the headers (length fields), the headers immediately
+ follow the list of length fields. The size of the last header is
+ implicit. The count and the length fields are encoded using the
+ following logic: the most significant bit in the octect is used as
+ mark, if set to 1 the value continues in the next byte; the other 7
+ bits are used to store the value. The headers are packed in the same
+ order they are present in ogg: identification, comment, setup.
@@ -498,8 +500,6 @@
-
-
Barbato Expires November 5, 2007 [Page 9]
Internet-Draft draft-ietf-avt-rtp-vorbis-04 May 2007
@@ -643,7 +643,7 @@
The key difference between the in-band format and this one, is there
is no need for the payload header octet. In this figure the comment
- has a size bigger than 255 bytes.
+ has a size bigger than 127 bytes.
3.3. Loss of Configuration Headers
@@ -1259,7 +1259,8 @@
Mike Smith, Phil Kerr, Michael Sparks, Magnus Westerlund, David
Barrett, Silvia Pfeiffer, Stefan Ehmann, Alessandro Salvatori.
Politecnico di Torino (LS)^3/IMG Group in particular Federico
- Ridolfo, Francesco Varano, Giampaolo Mancini, Juan Carlos De Martin.
+ Ridolfo, Francesco Varano, Giampaolo Mancini, Dario Gallucci, Juan
+ Carlos De Martin.
12. References
@@ -1280,7 +1281,6 @@
Description Protocol", RFC 4566, July 2006.
[5] Mogul, J. and S. Deering, "Path MTU discovery", RFC 1191,
- November 1990.
@@ -1289,6 +1289,8 @@
Internet-Draft draft-ietf-avt-rtp-vorbis-04 May 2007
+ November 1990.
+
[6] McCann et al., J., "Path MTU Discovery for IP version 6",
RFC 1981.
@@ -1338,8 +1340,6 @@
-
-
Barbato Expires November 5, 2007 [Page 24]
Internet-Draft draft-ietf-avt-rtp-vorbis-04 May 2007
Modified: trunk/vorbis/doc/draft-ietf-avt-rtp-vorbis-04.xml
===================================================================
--- trunk/vorbis/doc/draft-ietf-avt-rtp-vorbis-04.xml 2007-05-08 01:28:44 UTC (rev 12928)
+++ trunk/vorbis/doc/draft-ietf-avt-rtp-vorbis-04.xml 2007-05-08 08:22:19 UTC (rev 12929)
@@ -438,9 +438,9 @@
A Vorbis Packed Configuration is indicated with the Vorbis Data Type field set
to 1. Of the three headers, defined in the
<xref target="vorbis-spec-ref">Vorbis I specification</xref>, the
-identification and the setup MUST be packed together as they are, while the comment header MAY be replaced with a dummy one.
-The packed configuration follows a generic way to store xiph codec configurations: the first byte stores the number of following packets minus one, the next bytes represent the size of the packets, every byte set to 0xff means that the next byte has to be add to the current sum in order to have the complete size; the headers immediately follows the list of sizes. The headers are packed in the same order they are present in ogg: identification, comment, setup.
-</t>
+identification and the setup MUST be packed together as they are, while the comment header MAY be replaced with a dummy one. The packed configuration follows a generic way to store xiph codec configurations: The first field stores the number of following packets minus one (count field), the next ones represent the size of the headers (length fields), the headers immediately follow the list of length fields. The size of the last header is implicit.
+The count and the length fields are encoded using the following logic: the most significant bit in the octect is used as mark, if set to 1 the value continues in the next byte; the other 7 bits are used to store the value.
+The headers are packed in the same order they are present in ogg: identification, comment, setup.</t>
<figure anchor="Packed Configuration Figure" title="Packed Configuration Figure">
<artwork><![CDATA[
@@ -559,7 +559,7 @@
</figure>
<t>
The key difference between the in-band format and this one, is there is no need
-for the payload header octet. In this figure the comment has a size bigger than 255 bytes.
+for the payload header octet. In this figure the comment has a size bigger than 127 bytes.
</t>
</section>
@@ -1205,7 +1205,7 @@
Montgomery, Colin Perkins, Barry Short, Mike Smith, Phil Kerr, Michael Sparks,
Magnus Westerlund, David Barrett, Silvia Pfeiffer, Stefan Ehmann, Alessandro
Salvatori. Politecnico di Torino (LS)³/IMG Group in particular Federico
-Ridolfo, Francesco Varano, Giampaolo Mancini, Juan Carlos De Martin.
+Ridolfo, Francesco Varano, Giampaolo Mancini, Dario Gallucci, Juan Carlos De Martin.
</t>
</section>
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