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[Qemu-devel] [PATCH] pulseaudio: reduce 24s recording latency
From: |
Volker Rümelin |
Subject: |
[Qemu-devel] [PATCH] pulseaudio: reduce 24s recording latency |
Date: |
Fri, 11 Sep 2015 21:03:57 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 |
Current code doesn't provide pulseaudio buffer attributes for
recording. Without buffer attributes pulseaudio uses a default
buffer of 4MB. 4MB is approximately 24s 16bit stereo audio
data at 44.1kHz.
This patch fixes bug #1492649
|Signed-off-by: Volker Rümelin <address@hidden>|
---
audio/paaudio.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/audio/paaudio.c b/audio/paaudio.c
index fea6071..c1169d4 100644
--- a/audio/paaudio.c
+++ b/audio/paaudio.c
@@ -608,6 +608,7 @@ 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;
@@ -616,6 +617,12 @@ static int qpa_init_in(HWVoiceIn *hw, struct audsettings
*as, void *drv_opaque)
ss.channels = as->nchannels;
ss.rate = as->freq;
+ ba.fragsize = pa_frame_size (&ss) * g->conf.samples;
+ ba.maxlength = 5 * ba.fragsize;
+ ba.tlength = -1;
+ ba.prebuf = -1;
+ ba.minreq = -1;
+
obt_as.fmt = pa_to_audfmt (ss.format, &obt_as.endianness);
pa->stream = qpa_simple_new (
@@ -625,7 +632,7 @@ static int qpa_init_in(HWVoiceIn *hw, struct audsettings
*as, void *drv_opaque)
g->conf.source,
&ss,
NULL, /* channel map */
- NULL, /* buffering attributes */
+ &ba, /* buffering attributes */
&error
);
if (!pa->stream) {
--
1.8.4.5