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

[Arun Raghavan <arunsr src gnome org>]

commit 24882e924af2c0d8576970440d92ac5b4eb25bc8
Author: Arun Raghavan <arun raghavan collabora co uk>
Date:   Mon Nov 21 23:27:08 2011 +0530

    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

 src/empathy-audio-sink.c |    4 ++++
 src/empathy-audio-src.c  |    3 +++
 2 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/empathy-audio-sink.c b/src/empathy-audio-sink.c
index d912e1d..5ab14b5 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 635c87d..aa271fa 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;
 }