ref: e6c9d9efd65189c47944fd669794ce984914831e
parent: ccfad2756fba4076922f5c90993db2001cbc3b25
author: Jean-Marc Valin <[email protected]>
date: Wed Mar 4 12:48:30 EST 2009
Trying to use ptime
--- a/doc/ietf/draft-valin-celt-rtp-profile.xml
+++ b/doc/ietf/draft-valin-celt-rtp-profile.xml
@@ -441,18 +441,32 @@
</t>
<t>
+The SDP parameters have the following interpretation with respect to CELT:
+</t>
+
+<t>
+<list style="empty">
+<t>b=AS: The maximum bandwidth (in kbit/s) allowed for CELT, excluding the header overhead. The default is 64 kbit/s.</t>
+
+<t>ptime: The desired packetization time. If multiple frame sizes are offered, ptime is the minimum packetization time desired. The default is 20 ms as specified in []</t>
+
+<t>maxptime: The maximum packetization time desired. The default is "no maximum".</t>
+
+</list>
+</t>
+
+<t>
Several CELT-specific parameters can be given via the "a=fmtp:" directive. The
following parameters are defined for use in this way:
</t>
<t>
-<vspace blankLines="1" />
<list style="empty">
-<t>frame-size: duration of each frame in samples. The default is 256.<vspace blankLines="1" /></t>
+<t>frame-size: duration of each frame in samples. The default is 256.</t>
-<t>nb-frames: number of frames per packet (per stream). The default is 1.<vspace blankLines="1" /></t>
+<t>nb-frames: number of frames per packet (per stream). The default is 1.</t>
-<t>mapping: Optional string describing the multi-channel mapping. <vspace blankLines="1" /></t>
+<t>mapping: Optional string describing the multi-channel mapping. </t>
</list>
</t>
@@ -490,7 +504,7 @@
Note that the RTP payload type code of 97 is defined in this media
definition to be 'mapped' to the CELT codec at a 48kHz sampling
frequency using the 'a=rtpmap' line. Any number from 96 to 127
-could have been chosen (the allowed range for dynamic types). If there are
+could have been chosen (the allowed range for dynamic types). If there
is more than one channel being encoded the rtpmap MUST specify the channel
count.
</t>
@@ -602,7 +616,7 @@
Which specifies a single two-channel CELT stream according to the default
mapping.
</t>
-
+
</section>
@@ -675,7 +689,7 @@
denial-of-service threat due to the receipt of pathological data.
Nor does the RTP payload format contain any active content.
</t>
-
+
<t>
Because this format supports VBR operation small amounts of information
about the transmitted audio may be leaked by a length preserving