[libvirt] [PULL 3/4] pulseaudio: process audio data in smaller chunks

[Gerd Hoffmann]

The rate of pulseaudio absorbing the audio stream is used to control the
the rate of the guests audio stream.  When the emulated hardware uses
small chunks (like intel-hda does) we need small chunks on the audio
backend side too, otherwise that feedback loop doesn't work very well.

Cc: Max Ehrlich <maxehr at umiacs.umd.edu>
Cc: Martin Schrodt <martin at schrodt.org>
Buglink: https://bugs.launchpad.net/bugs/1795527
Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd at redhat.com>
Message-id: 20181109142032.1628-1-kraxel at redhat.com
---
 audio/paaudio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/audio/paaudio.c b/audio/paaudio.c
index 949769774d..4c100bc318 100644
--- a/audio/paaudio.c
+++ b/audio/paaudio.c
@@ -227,7 +227,7 @@ static void *qpa_thread_out (void *arg)
             }
         }
 
-        decr = to_mix = audio_MIN (pa->live, pa->g->conf.samples >> 2);
+        decr = to_mix = audio_MIN(pa->live, pa->g->conf.samples >> 5);
         rpos = pa->rpos;
 
         if (audio_pt_unlock(&pa->pt, __func__)) {
@@ -319,7 +319,7 @@ static void *qpa_thread_in (void *arg)
             }
         }
 
-        incr = to_grab = audio_MIN (pa->dead, pa->g->conf.samples >> 2);
+        incr = to_grab = audio_MIN(pa->dead, pa->g->conf.samples >> 5);
         wpos = pa->wpos;
 
         if (audio_pt_unlock(&pa->pt, __func__)) {
-- 
2.9.3