draft-ietf-avt-evrc-smv-02.txt   draft-ietf-avt-evrc-smv-03.txt 
Internet Draft Adam H. Li Internet Draft Adam H. Li
draft-ietf-avt-evrc-smv-02.txt UCLA draft-ietf-avt-evrc-smv-03.txt UCLA
June 7, 2002 Editor June 11, 2002 Editor
Expires: December 7, 2002 Expires: December 11, 2002
RTP Payload Format for Enhanced Variable Rate Codecs (EVRC) and RTP Payload Format for Enhanced Variable Rate Codecs (EVRC) and
Selectable Mode Vocoders (SMV) Selectable Mode Vocoders (SMV)
STATUS OF THIS MEMO STATUS OF THIS MEMO
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC 2026. all provisions of Section 10 of RFC 2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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Media Type Name: audio Media Type Name: audio
Media Subtype Name: EVRC Media Subtype Name: EVRC
Required Parameter: none Required Parameter: none
Optional parameters: Optional parameters:
The following parameters apply to RTP transfer only. The following parameters apply to RTP transfer only.
ptime: Defined as usual for RTP audio RFC 2327. ptime: Defined as usual for RTP audio (see RFC 2327).
maxptime: The maximum amount of media which can be encapsulated maxptime: The maximum amount of media which can be encapsulated
in each packet, expressed as time in milliseconds. The time in each packet, expressed as time in milliseconds. The time
SHALL be calculated as the sum of the time the media present SHALL be calculated as the sum of the time the media present
in the packet represents. The time SHOULD be a multiple of the in the packet represents. The time SHOULD be a multiple of the
duration of a single codec data frame (20 msec). If not duration of a single codec data frame (20 msec). If not
signaled, the default maxptime value SHALL be 200 signaled, the default maxptime value SHALL be 200
milliseconds. milliseconds.
maxinterleave: Maximum number for interleaving length (field LLL maxinterleave: Maximum number for interleaving length (field LLL
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Media Type Name: audio Media Type Name: audio
Media Subtype Name: SMV Media Subtype Name: SMV
Required Parameter: none Required Parameter: none
Optional parameters: Optional parameters:
The following parameters apply to RTP transfer only. The following parameters apply to RTP transfer only.
ptime: Defined as usual for RTP audio 2327. ptime: Defined as usual for RTP audio (see RFC 2327).
maxptime: The maximum amount of media which can be encapsulated maxptime: The maximum amount of media which can be encapsulated
in each packet, expressed as time in milliseconds. The time in each packet, expressed as time in milliseconds. The time
SHALL be calculated as the sum of the time the media present SHALL be calculated as the sum of the time the media present
in the packet represents. The time SHOULD be a multiple of the in the packet represents. The time SHOULD be a multiple of the
duration of a single codec data frame (20 msec). If not duration of a single codec data frame (20 msec). If not
signaled, the default maxptime value SHALL be 200 signaled, the default maxptime value SHALL be 200
milliseconds. milliseconds.
maxinterleave: Maximum number for interleaving length (field LLL maxinterleave: Maximum number for interleaving length (field LLL
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is as follows: is as follows:
o The MIME type ("audio") goes in SDP "m=" as the media name. o The MIME type ("audio") goes in SDP "m=" as the media name.
o The MIME subtype (payload format name) goes in SDP "a=rtpmap" o The MIME subtype (payload format name) goes in SDP "a=rtpmap"
as the encoding name. as the encoding name.
o The parameters "ptime" and "maxptime" go in the SDP "a=ptime" o The parameters "ptime" and "maxptime" go in the SDP "a=ptime"
and "a=maxptime" attributes, respectively. and "a=maxptime" attributes, respectively.
o The parameter Ÿmaxinterleave÷ goes in the SDP "a=fmtp" o The parameter "maxinterleave" goes in the SDP "a=fmtp"
attribute by copying it directly from the MIME media type string attribute by copying it directly from the MIME media type string
as ÷maxinterleave=value÷. as "maxinterleave=value".
Some examples of SDP session descriptions for EVRC and SMV encodings Some examples of SDP session descriptions for EVRC and SMV encodings
follow below. follow below.
Example of usage of EVRC: Example of usage of EVRC:
m=audio 49120 RTP/AVP 97 m=audio 49120 RTP/AVP 97
a=rtpmap:97 EVRC a=rtpmap:97 EVRC
a=fmtp:97 maxinterleave=2 a=fmtp:97 maxinterleave=2
a=maxptime:80 a=maxptime:80
 End of changes. 

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