On 03/15/2013 10:41 AM, Richard Kenner wrote:
There appears to be a disagreement between the encoding given in the
sources for Siren14 that are downloaded from Polycom (and the ITU, both
are the same) and that implemented by codec_siren14.so. The latter
agrees with the actual device.
If I make a .sln32 file and run the encoder from ITU/Polycom with
encode 0 foo.sln32 foo.siren14 48000 14000
the resulting file doesn't play back correctly with the Digium's siren14
codec. I know the parameters are correct because the file is the same
size as that made by the Digium codec.
Both sets of decoders/encoders (Digium and Polycom/ITU) are symmetric and
can decode what they encode, but neither can read the encoding of the other.
Is there some subtle difference between G.722.1C and Siren14?
G,722.1C is not the same as Siren 14. This is stated in the Polycom
material but they don't really indicate how different the two are. More
importantly, they are vague about whether the two can be expected to
interwork satisfactorily.
Polycom only offer source code for G.722.1C, so you can't really figure
out the differences for yourself. People are really sloppy about these
names and something called siren14 might well be G.722.1C. I assume
something called G.722.1C is always G.722.1C.
Steve
--
_____________________________________________________________________
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
http://www.asterisk.org/hello
asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
http://lists.digium.com/mailman/listinfo/asterisk-users
