Speex dev - Aug 2004 - @Christian Buchner: speex acm & netmeeting

Hi,
> I can't tell why. Try to register mode 8kHz Mono mode Q3 or Q4 for
Ok, I will try it. I tried 16kHz Q3 mono at 9,8kbit.
> and upwards use 2 frames. All this is defined in codec.c in the
> QualityInfo[] table.
Oh OK. I looked a bit in the sources, but it was too confusing for me. ;-)
> I would be interested in seeing the code for registering the Speex codec
> with Netmeeting.
Well, a very straight forward approach. There is a sample app which 
comes with the netmeeting sdk. I just filled the values with the header 
of a speex wave I created. I can send you the source if you like.

Sprichst Du Deutsch? I mean in emails we could talk German then.

bye,

D A

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Hi again,
>> I can't tell why. Try to register mode 8kHz Mono mode Q3 or Q4 for
Yes! It works! I tried mono 8kbit 8khz Q3 and it seems to work! I am 
currently talking to a friend, both ends using Speex!

Sound Quality is not as good as speeak freely@adpvm, but it uses only 
quarter of bandwidth and for that the quality is not bad. Perhaps I'll 
try Q4, as well.

I really would like to use 16kHz mode. Do you think it will be possible?

Only strange think with currently using mode is, that it registerd twice...

bye,

D A

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> Yes! It works! I tried mono 8kbit 8khz Q3 and it seems to work! I am 
> currently talking to a friend, both ends using Speex!
> Sound Quality is not as good as speeak freely@adpvm, but it uses only 
> quarter of bandwidth and for that the quality is not bad. Perhaps I'll 
> try Q4, as well.
Q4 and Q3 seem to produce the same results. Internally speex is controlled
by tables defining coding parameters for various quality levels. In this
case there is no difference between 3 and 4.

Here's the 16 bit Mono mode list

           79, 320,	8,	3950,	// 16000 1 0
          115, 320,	8,	5750,	// 16000 1 1
          155, 320,	8,	7750,	// 16000 1 2
          196, 320,	2,	9800,	// 16000 1 3
          256, 320,	1, 12800,	// 16000 1 4
          336, 320,	1, 16800,	// 16000 1 5
          412, 320,	2, 20600,	// 16000 1 6
          476, 320,	2, 23800,	// 16000 1 7
          556, 320,	2, 27800,	// 16000 1 8
          684, 320,	2, 34200,	// 16000 1 9
          844, 320,	2, 42200,	// 16000 1 10

As you can see Q4 and Q5 are good candidates providing one
frame per block at rates of 12800 and 16800 bits/sec.

The fact that your mode registered twice may be because you may
have forgotten to unregister your previous attempt ;) There is
a separate API call to remove a codec from Netmeeting again.

Christian

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