[Qemu-devel] [PATCH 2/6] pa: process 1/4 buffer max at once

[Gerd Hoffmann <kraxel@redhat.com>]

Limit the size of data pieces processed by the pulseaudio worker
threads.  Never ever process more than 1/4 of the buffer at once.
Data processing is less bulky then.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 audio/paaudio.c |   14 ++++----------
 1 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/audio/paaudio.c b/audio/paaudio.c
index f768ca9..f99ca73 100644
--- a/audio/paaudio.c
+++ b/audio/paaudio.c
@@ -57,9 +57,6 @@ static void *qpa_thread_out (void *arg)
 {
     PAVoiceOut *pa = arg;
     HWVoiceOut *hw = &pa->hw;
-    int threshold;
-
-    threshold = conf.divisor ? hw->samples / conf.divisor : 0;
 
     if (audio_pt_lock (&pa->pt, AUDIO_FUNC)) {
         return NULL;
@@ -73,7 +70,7 @@ static void *qpa_thread_out (void *arg)
                 goto exit;
             }
 
-            if (pa->live > threshold) {
+            if (pa->live > 0) {
                 break;
             }
 
@@ -82,7 +79,7 @@ static void *qpa_thread_out (void *arg)
             }
         }
 
-        decr = to_mix = pa->live;
+        decr = to_mix = audio_MIN (pa->live, conf.samples >> 2);
         rpos = pa->rpos;
 
         if (audio_pt_unlock (&pa->pt, AUDIO_FUNC)) {
@@ -152,9 +149,6 @@ static void *qpa_thread_in (void *arg)
 {
     PAVoiceIn *pa = arg;
     HWVoiceIn *hw = &pa->hw;
-    int threshold;
-
-    threshold = conf.divisor ? hw->samples / conf.divisor : 0;
 
     if (audio_pt_lock (&pa->pt, AUDIO_FUNC)) {
         return NULL;
@@ -168,7 +162,7 @@ static void *qpa_thread_in (void *arg)
                 goto exit;
             }
 
-            if (pa->dead > threshold) {
+            if (pa->dead > 0) {
                 break;
             }
 
@@ -177,7 +171,7 @@ static void *qpa_thread_in (void *arg)
             }
         }
 
-        incr = to_grab = pa->dead;
+        incr = to_grab = audio_MIN (pa->dead, conf.samples >> 2);
         wpos = pa->wpos;
 
         if (audio_pt_unlock (&pa->pt, AUDIO_FUNC)) {
-- 
1.7.1