[Qemu-devel] [PATCH V3 3/3] audio/paaudio: fix microphone input being unusable

[Martin Schrodt]

The current code does not specify the metrics of the buffers for the
input device. This makes PulseAudio choose very bad defaults, which
causes input to be unusable: Audio put in gets out 30 seconds later.
This patch fixes that and makes the latency configurable as well.

Signed-off-by: Martin Schrodt <address@hidden>
---
 audio/paaudio.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/audio/paaudio.c b/audio/paaudio.c
index adf5fe3779..7ea636342f 100644
--- a/audio/paaudio.c
+++ b/audio/paaudio.c
@@ -601,6 +601,7 @@ static int qpa_init_in(HWVoiceIn *hw, struct audsettings 
*as, void *drv_opaque)
 {
     int error;
     pa_sample_spec ss;
+    pa_buffer_attr ba;
     struct audsettings obt_as = *as;
     PAVoiceIn *pa = (PAVoiceIn *) hw;
     paaudio *g = pa->g = drv_opaque;
@@ -611,6 +612,11 @@ static int qpa_init_in(HWVoiceIn *hw, struct audsettings 
*as, void *drv_opaque)
     ss.channels = as->nchannels;
     ss.rate = as->freq;
 
+    ba.fragsize = pa_usec_to_bytes(ppdo->latency, &ss);
+    ba.maxlength = -1;
+    ba.minreq = -1;
+    ba.prebuf = -1;
+
     obt_as.fmt = pa_to_audfmt (ss.format, &obt_as.endianness);
 
     pa->stream = qpa_simple_new (
@@ -620,7 +626,7 @@ static int qpa_init_in(HWVoiceIn *hw, struct audsettings 
*as, void *drv_opaque)
         ppdo->has_name ? ppdo->name : NULL,
         &ss,
         NULL,                   /* channel map */
-        NULL,                   /* buffering attributes */
+        &ba,                    /* buffering attributes */
         &error
         );
     if (!pa->stream) {
-- 
2.21.0