ref: 920648e09f8a03931bfdc817b3263c8f653ee680
parent: de1fd28740a33930b661a64a0ca52bd7c32fa20e
author: Jean-Marc Valin <[email protected]>
date: Fri Nov 28 09:43:38 EST 2008
Getting rid of more stuff left from the Speex draft
--- a/doc/ietf/draft-valin-celt-rtp-profile.xml
+++ b/doc/ietf/draft-valin-celt-rtp-profile.xml
@@ -130,9 +130,12 @@
<t>Padding (P): 1 bit</t><t>
If the padding bit is set, the packet contains one or more
- additional padding octets at the end which are not part of
- the payload. P is set if the total packet size is less than
- the MTU.
+ additional padding octets at the end which are not part of the
+ payload. The last octet of the padding contains a count of how
+ many padding octets should be ignored, including itself. Padding
+ may be needed by some encryption algorithms with fixed block sizes
+ or for carrying several RTP packets in a lower-layer protocol data
+ unit.
</t>
<t>Extension (X): 1 bit</t><t>
@@ -146,10 +149,8 @@
</t>
<t>Marker (M): 1 bit</t><t>
- The M bit indicates if the packet contains comfort noise. This
- field is used in conjunction with the cng SDP attribute and is
- detailed further in section 5 below. In normal usage this bit
- is set if the packet contains comfort noise.
+ The M bit MUST be set to zero in all packets. The receiver MUST
+ ignore the M bit.
</t>
<t>Payload Type (PT): 7 bits</t><t>
@@ -168,7 +169,7 @@
<t>Timestamp: 32 bits</t><t>
A timestamp representing the sampling time of the first sample of
- the first CELT packet in the RTP packet. The clock frequency
+ the first CELT frame in the RTP packet. The clock frequency
MUST be set to the sample rate of the encoded audio data.
CELT can use different frame sizes and a variable sampling rate clock.
@@ -398,7 +399,7 @@
<vspace blankLines="1" />
<list style="empty">
<t>m=audio 8088 RTP/AVP 97</t>
-<t>b=AS:10</t>
+<t>b=AS:64</t>
<t>a=rtmap:97 CELT/48000</t>
</list>
@@ -405,7 +406,7 @@
<t>
In this case, if the remote part agrees, it should configure its
CELT encoder so that it does not use modes that produce more than
-10 kbit/s. Note that the "b=" constraint also applies on all
+64 kbit/s. Note that the "b=" constraint also applies on all
payload types that may be proposed in the media line ("m=").</t>
@@ -417,9 +418,9 @@
<vspace blankLines="1" />
<list style="empty">
-<t>fsize: duration of each frame in samples (default is 256).<vspace blankLines="1" /></t>
+<t>frame-size: duration of each frame in samples (default is 256).<vspace blankLines="1" /></t>
-<t>nframes: number of frames per packet (default is 1).<vspace blankLines="1" /></t>
+<t>nb-frames: number of frames per packet (default is 1).<vspace blankLines="1" /></t>
<t>vbr: variable bit rate - either 'on' 'off' or 'vad'
(defaults to off). If on, variable bit rate is
@@ -432,7 +433,7 @@
<list style="empty">
<t>m=audio 8008 RTP/AVP 97</t>
<t>a=rtpmap:97 CELT/44100</t>
- <t>a=fmtp:97 fsize=512;nframes=2</t>
+ <t>a=fmtp:97 frame-size=512;nb-frames=2</t>
</list>
<t>