i am developing a SIP application for making and receiving a call and i want to add the G729 codec in my application.
currently i am doing analysis on open source project SipDroid. if i want to make that application to support G729 codec how to do that?
there is a different codecs configuration file in org.sipdroid.codecs package.how do create the this kind of .java file for G729 codec?
Any suggestion and response will be appreciated.
Log message of asterisk
Found RTP audio format 101
Found audio description format telephone-event for ID 101
Found RTP video format 103
Found video description format h263-1998 for ID 103
Capabilities: us - 0x100 (g729), peer - audio=0x0 (nothing)/video=0x100000 (h263p)/text=0x0 (nothing), combined - 0x0 (nothing)
Non-codec capabilities (dtmf): us - 0x1 (telephone-event|), peer - 0x1 (telephone-event|), combined - 0x1 (telephone-event|)
[Apr 9 18:00:25] NOTICE[3813]: chan_sip.c:9187 process_sdp: **No compatible codecs**, not accepting this offer!
SDP
To: <sip:5003@192.168.1.17>
From: <sip:5004@192.168.1.17>;tag=z9hG4bK80811693
Call-ID: 082004294635@10.0.2.15
CSeq: 2 INVITE
Contact: <sip:5004@10.0.2.15:36252;transport=udp>
Expires: 3600
User-Agent: MySipdroid. !/2.4 beta/sdk
Authorization: Digest username="5004", realm="asterisk", nonce="6264308a", uri="sip:5003@192.168.1.17", algorithm=MD5, response="fb6dfb528d362657ef01458f96653adb"
Content-Length: 137
Content-Type: application/sdp
v=0
o=5004@192.168.1.17 0 0 IN IP4 10.0.2.15
s=Session SIP/SDP
c=IN IP4 10.0.2.15
t=0 0
m=audio 21000 RTP/AVP
a=fmtp:18 annexb=no
<------------->
--- (13 headers 7 lines) ---
Sending to 192.168.1.17:35370 (NAT)
Using INVITE request as basis request - 082004294635@10.0.2.15
Found peer '5004' for '5004' from 192.168.1.17:35370
== Using SIP RTP CoS mark 5
Capabilities: us - 0x100 (g729), peer - audio=0x0 (nothing)/video=0x0 (nothing)/text=0x0 (nothing), combined - 0x0 (nothing)
Non-codec capabilities (dtmf): us - 0x1 (telephone-event|), peer - 0x0 (nothing), combined - 0x0 (nothing)
[Apr 10 12:01:05] NOTICE[3524]: chan_sip.c:9187 process_sdp: No compatible codecs, not accepting this offer!
Result of Show Translation
core show translation
Translation times between formats (in microseconds) for one second of data
Source Format (Rows) Destination Format (Columns)
g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g722 siren7 siren14 slin16 g719 speex16 testlaw
g723 - - - - - - - - - - - - - - - - - - -
gsm - - 1001 1001 3000 2000 1000 3000 3999 - 8999 3999 1001 - - 1002 - - 1001
ulaw - 2000 - 1 2001 1001 1 2001 3000 - 8000 3000 2 - - 3 - - 2
alaw - 2000 1 - 2001 1001 1 2001 3000 - 8000 3000 2 - - 3 - - 2
g726aal2 - 2999 1001 1001 - 2000 1000 3000 3999 - 8999 3999 1001 - - 1002 - - 1001
adpcm - 2000 2 2 2001 - 1 2001 3000 - 8000 3000 2 - - 3 - - 2
slin - 1999 1 1 2000 1000 - 2000 2999 - 7999 2999 1 - - 2 - - 1
lpc10 - 2999 1001 1001 3000 2000 1000 - 3999 - 8999 3999 1001 - - 1002 - - 1001
g729 - 2999 1001 1001 3000 2000 1000 3000 - - 8999 3999 1001 - - 1002 - - 1001
speex - - - - - - - - - - - - - - - - - - -
ilbc - 2998 1000 1000 2999 1999 999 2999 3998 - - 3998 1000 - - 1001 - - 1000
g726 - 2999 1001 1001 3000 2000 1000 3000 3999 - 8999 - 1001 - - 1002 - - 1001
g722 - 2000 2 2 2001 1001 1 2001 3000 - 8000 3000 - - - 1 - - 2
siren7 - - - - - - - - - - - - - - - - - - -
siren14 - - - - - - - - - - - - - - - - - - -
slin16 - 3000 1002 1002 3001 2001 1001 3001 4000 - 9000 4000 1000 - - - - - 1002
g719 - - - - - - - - - - - - - - - - - - -
speex16 - - - - - - - - - - - - - - - - - - -
testlaw - 2000 2 2 2001 1001 1 2001 3000 - 8000 3000 2 - - 3 - - -
sip.conf
[5004]
type=friend
username=5004
secret=5004
host=dynamic
context=testcontext
nat=yes
disallow=all
allow=g729
qualify=yes
callerid="919999121312"<5004>
your asterisk logs looks pretty good to support the codec, but you need the g729 encoder on your client android application (seems to be a commercial license for now), please let me know if you have any luck on getting an opensource license of the codec.
Licensing
G.729 includes patents from several companies and is licensed by Sipro Lab Telecom. Sipro Lab Telecom is the authorized Intellectual Property Licensing Administrator for G.729 technology and patent pool.[3][4][5][6] In a number of countries, the use of G.729 may require a license fee and/or royalty fee.[5]
Source: http://en.wikipedia.org/wiki/G.729
Regards.
来源：https://stackoverflow.com/questions/10069274/how-to-add-g729-codec-in-android-application