audio-src,audio-sink: Use lower latency values on pulsesrc/pulsesink

This sets the pulsesink and pulsesrc buffer/latency parameters to be
lower and more voip-friendly. If the system cannot provide or keep up
with these values, PulseAudio will automatically try to adapt and
provide larger values that are achievable.

https://bugzilla.gnome.org/show_bug.cgi?id=663124

2 files changed, 7 insertions, 0 deletions

diff --git a/src/empathy-audio-sink.c b/src/empathy-audio-sink.c
index d912e1d2d..5ab14b541 100644
--- a/src/empathy-audio-sink.c
+++ b/src/empathy-audio-sink.c
@@ -220,6 +220,10 @@ create_sink (EmpathyGstAudioSink *self)
 
   empathy_call_set_stream_properties (sink, self->priv->echo_cancel);
 
+  /* Set latency (buffering on the PulseAudio side) of 40ms and transfer data
+   * in 10ms chunks */
+  g_object_set (sink, "buffer-time", 40000, "latency-time", 10000, NULL);
+
   return sink;
 }
 
diff --git a/src/empathy-audio-src.c b/src/empathy-audio-src.c
index 635c87d24..aa271fa1c 100644
--- a/src/empathy-audio-src.c
+++ b/src/empathy-audio-src.c
@@ -331,6 +331,9 @@ create_src (void)
 
   empathy_call_set_stream_properties (src, TRUE);
 
+  /* Set latency (buffering on the PulseAudio side) of 20ms */
+  g_object_set (src, "buffer-time", 20000, NULL);
+
   return src;
 }