[pulseaudio-tickets] [PulseAudio] #286: Wrong latency correction with tunnel ?

[PulseAudio]

#286: Wrong latency correction with tunnel ?
---------------------------+------------------------------------------------
 Reporter:  Chimrod        |       Owner:  lennart
     Type:  enhancement    |      Status:  new    
 Priority:  normal         |   Milestone:         
Component:  module-tunnel  |    Severity:  minor  
 Keywords:  latency        |  
---------------------------+------------------------------------------------
 Hello,

 In my network, I tried to get a surrond sound with 2 computer : one for
 the left side, and another one for the right side. The deviation between
 the two computers is slow ( I can hear a difference after 30mn ), but I
 tried to use module-tunnel and module-combine instead of rtp transmition.

 As sound as module-combine try to adjust the frequency, the two channels
 are not synchronyzed anymore; there is a small latency on the remote
 computer wich I can notice immediately. Actually, it correct the
 frequency, but always with a '''constant''' latency between the two
 computers : there is no deviation, but the sounds are not synchronized, as
 if there is something missing in the latency calculation.

 I look in the source, ( pulseaduio-0.9.10 ), and I correct, in the module
 /module-tunnel.c the stream_get_latency_callback function, replacing

 {{{
 #ifdef TUNNEL_SINK
     host_usec = sink_usec + transport_usec;
 #else
 }}}

 by :

 {{{
 #ifdef TUNNEL_SINK
     host_usec = (sink_usec*2) + transport_usec;
 #else
 }}}

 Now I have a true synchronization between the two computers. I didn't
 search the why of this solution : this work for me and I don't know if it
 will be the same for another one configuration, the source of pulseaudio
 is to huge for me for inspect this.

 So, I send you this ticket, and saying that this work for '''me''', and
 I'm not sure it will work on '''another one''' system.

 And thanks for this wonderfull soft :-)

 --
 Chimrod

-- 
Ticket URL: <http://www.pulseaudio.org/ticket/286>
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