Re: [MMUSIC] SDP media capabilities and nightmare SDP

["Robert R. Gilman" <[e-mail]>]

Ingemar-
I checked draft-ietf-avt-rtp-amr-bis-06.txt, and it seems to say the
fmtp: line is the place for mode-set - but it doesn't matter - we play
the same list-the-codecs game with the cenc: attributes.

Roni, Flemming-
Shall we add the range option to the media-capabilities draft?

-Bob
----------------------------------------------------
Bob Gilman       [e-mail]      [phone]

Ingemar Johansson S (LU/EAB) wrote:
> Hi
> 
> I believe that slept over a few lessons, 1000 thanks for the help!. 
> This squeezed down the whole thing quite a bit. 
> Only thing that I find odd is that I regard the mode-set as an encoding
> parameter and not a format parameter but I am not 100% sure here.
> 
> If the ranging option is possible I believe that it would help up things
> even more, especially it would be less tedious to read.
> 
> Regards
> Ingemar
> 
>>-----Original Message-----
>>From: Robert R. Gilman [mailto:[e-mail]] 
>>Sent: den 21 mars 2007 21:32
>>To: Ingemar Johansson S (LU/EAB)
>>Cc: [e-mail]
>>Subject: Re: [MMUSIC] SDP media capabilities and nightmare SDP
>>
>>Ingemar-
>>Nightmare indeed!  I think you wanted to define 26 AMR codecs 
>>and 6 AMR-WB codecs (I'm not sure.)  Try this (I've folded 
>>the cmed: line and the cenc: line):
>>
>>a=creq:v1
>>m=audio 49152 RTP/AVP 100
>>a=rtpmap:100 AMR/8000/1
>>a=fmtp:100 mode-set=0; mode-change-capability=2; max-red=220 
>>a=maxptime:240 a=ptime:20
>>a=cmed:2 audio AMR AMR AMR AMR AMR AMR AMR AMR AMR AMR AMR AMR
>>     AMR ARM AMR AMR AMR AMR AMR AMR AMR AMR AMR AMR AMR AMR
>>     AMR-WB AMR-WB AMR-WB AMR-WB AMR-WB AMR-WB AMR-WB
>>a=cenc:2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,
>>23,24,25,26
>>     8000/1
>>a=cenc:27,28,29,30,31 16000/2
>>a=cfmt:14 mode-set=0;
>>a=cfmt:2,15 mode-set=0,2,4,7;
>>a=cfmt:3,16 mode-set=2;
>>a=cfmt:4,17 mode-set=3;
>>a=cfmt:5,18 mode-set=4;
>>a=cfmt:6,19 mode-set=5;
>>a=cfmt:7,20 mode-set=6;
>>a=cfmt:8,21 mode-set=7;
>>a=cfmt:9,22 mode-set=0,2;
>>a=cfmt:10,23 mode-set=0,2,3;
>>a=cfmt:11,24 mode-set=0,2,3,4;
>>a=cfmt:12,25 mode-set==0,2,3,6;
>>a=cfmt:13,26 mode-set=0,2,5,7;
>>a=cfmt:27,30 mode-set=0,1,2;
>>a=cfmt:28,31 mode-set=0,1,2,5;
>>a=cfmt:29,32 mode-set=0,1,2,9;
>>a=cfmt:2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,
>>23,24,25,26,
>>     27,28,29,30,31,32 mode-change-capability=2; max-red=220;
>>a=cfmt:14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,3
>>2 octet-align=1
>>pcfg:1 
>>m=2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|
>>     27|28|29|30|31|32 
>>pt=2:100,3:100,4:100,5:100,6:100,7:100,8:100,9:100,10:100,
>>     
>>11:100,12:100,13:100,14:100,15:100,16:100,17:100,18:100,19:100,20:100,
>>     
>>21:100,22:100,23:100,24:100,25:100,26:100,27:100,28:100,29:100,30:100,
>>     31:100,32:100
>>
>>We've assumed the default (media line) transport.  Looking at 
>>this example, I wonder if we don't want to implement some 
>>ranging on the media capability numbers - something like:
>>
>>a=cenc:2-26 8000/1
>>a=cenc:27-32 16000/1
>>a=cfmt:2-32 mode-change-capability=2; max-red=220;
>>
>>and
>>
>>pcfg:1 
>>m=2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|
>>     27|28|29|30|31|32 pt=100:2-32
>>
>>Of course, the long form of the pt parameter would be used if 
>>the offeror wanted to distinguish the answerer's choice via 
>>the payload type received prior to receiving the answer.  Do 
>>you have a suggestion for how to say "pick one codec from 
>>this range" that's better than the 2|3|4|... ad nauseum?
>>Does this more-or-less fit with what you wanted to express?
>>-Bob
>>----------------------------------------------------
>>Bob Gilman       [e-mail]      [phone]
>>
> 
> 


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