ref: 36d2a7fd4a3c7aeb7fa11e8827a45846446b6c2e
parent: 0b765bf8c1335c0e74dd593a0557449f34a8a896
author: Jean-Marc Valin <[email protected]>
date: Wed Jul 8 05:43:40 EDT 2009
Suggestions/corrections by Stefan Sayer.
--- a/doc/ietf/draft-valin-celt-rtp-profile.xml
+++ b/doc/ietf/draft-valin-celt-rtp-profile.xml
@@ -99,22 +99,6 @@
An optional padding terminator may also be used.
</t>
-<t>
-<figure>
-<artwork><![CDATA[
- 0 1 2 3
- 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | RTP Header |
- +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
- | one or more frames of CELT .... |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | .... |
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-]]></artwork>
-</figure>
-</t>
-
<section anchor="RTP Header" title="RTP Header">
<t>
@@ -589,16 +573,24 @@
the bit-rate MUST NOT be changed during the session.
</t>
-<t>
-For example a low-overhead surround configuration could be signaled as:
+<t>
+For example a low-overhead 64 kbit/s mono stream could be signaled as:
<list style="empty">
<t>m=audio 8008 RTP/AVP 97</t>
<t>a=ptime: 5</t>
+<t>a=rtpmap:97 CELT/48000/1</t>
+<t>a=fmtp:97 low-overhead=256/43</t>
+</list>
+
+and a low-overhead 360 kbit/s 5.1 surround configuration could be signaled as:
+<list style="empty">
+<t>m=audio 8008 RTP/AVP 97</t>
+<t>a=ptime: 5</t>
<t>a=rtpmap:97 CELT/48000/6</t>
-<t>a=fmtp:97 low-overhead=256/1/86,86,43,30;mapping=2,2,1,1/L,R,LR,RR,C,MLFE/ITU-RBS.775-1</t>
+<t>a=fmtp:97 low-overhead=256/86,86,43,25;mapping=2,2,1,1/L,R,LR,RR,C,MLFE/ITU-RBS.775-1</t>
</list>
-In this example, 4 bytes per packet would be saved. This corresponds to a 6 kbit/s
+In this last example, 4 bytes per packet would be saved. This corresponds to a 6 kbit/s
reduction in the overhead, although the 60 kbit/s overhead of the IP, UDP and RTP
headers is still present.
</t>