Hi everyone,
I am writing a voip application using telepathy and I have run into some
strange issues that I can't explain myself. Let me explain the situation. I am
doing some testing with audio calls over jabber/jingle between my desktop
computer and my laptop (both inside the local NAT, in case this matters).
First, I have tried doing calls between my client (on the desktop) and google
talk (on the laptop). This scenario mostly works, I get correct audio on both
sides, but after a while (~30 seconds or so) the audio stream from my client
stops being delivered to gtalk and instead I get a continuous noise (always
the same) on gtalk.
Second, I have tried doing calls between my client and empathy. In this case,
although they connect fine, I don't get any audio on either side, instead I get
a "tak tak tak" noise with exactly 1 Hz frequency. This noise seems to be
coming from FsConference itself. I'll try to explain what makes me believe
that: I have a gstreamer pipeline that looks like this:
audiosrc -> volume -> FsConference -> liveadder -> audioresample -> volume ->
audiosink
(audiosrc and audiosink can be anything. I have tried so far autoaudio{src,
sink}, alsa{src,sink}, oss{src, sink} and audiotestsrc.)
Empathy has a similar one that looks like this:
gconfaudiosrc -> volume -> level -> FsConference -> liveadder -> audioresample
-> volume -> gconfaudiosink
The only practical difference is the "level" element, which apparently feeds a
small visualization widget on the empathy window that shows the level of the
audio coming from the microphone.
Both sides receive this "tak" noise. Now, if I mute one side by setting the
volume on the "volume" element of the input to 0, the other side stops getting
the noise. However, increasing the volume doesn't make any significant
difference. An important detail is that the visualization widget on empathy
reacts to the microphone and is not synchronized with the noise that I get on
the other side. So, that leads me to the conclusion that the FsConference
element somehow gets correct audio from the input and transforms it into this
noise. Thus, if it gets no audio, there is no noise.
The same exactly happens when I am trying to make calls with my client on both
sides. However, calls with empathy on both sides work fine. This makes me
wonder what can be wrong with my client. Both my client and empathy are very
similar applications, both using telepathy, telepathy-farsight, gstreamer and
even (almost) the same pipeline.
Does anybody have any clue? What can be wrong?
Thanks in advance.
Best regards,
George
PS: I am using telepathy-farsight 0.0.7 and farsight2 0.0.12 from debian
packages.
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