From 369829a435ad87d2ac8ae79e6dc61e8c76d6890b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Volker=20R=C3=BCmelin?= Date: Tue, 1 Mar 2022 20:13:02 +0100 Subject: [PATCH] jackaudio: use more jack audio buffers MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The next patch reduces the effective qemu playback buffer size by timer-period. Increase the number of jack audio buffers by one to preserve the total effective buffer size. The size of one jack audio buffer is 512 samples. With audio defaults that's 512 samples / 44100 samples/s = 11.6 ms and only slightly larger than the timer-period of 10 ms. The larger jack audio buffer increases audio dropout safety, because the high priority jack-audio worker threads can provide audio data for a longer period of time as with a smaller buffer and more audio data in the mixing engine buffer that they can't access. Signed-off-by: Volker Rümelin Reviewed-by: Christian Schoenebeck Message-Id: <20220301191311.26695-6-vr_qemu@t-online.de> Signed-off-by: Gerd Hoffmann --- audio/jackaudio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/audio/jackaudio.c b/audio/jackaudio.c index 317009e936..26246c3a8b 100644 --- a/audio/jackaudio.c +++ b/audio/jackaudio.c @@ -483,8 +483,8 @@ static int qjack_client_init(QJackClient *c) c->buffersize = 512; } - /* create a 2 period buffer */ - qjack_buffer_create(&c->fifo, c->nchannels, c->buffersize * 2); + /* create a 3 period buffer */ + qjack_buffer_create(&c->fifo, c->nchannels, c->buffersize * 3); qjack_client_connect_ports(c); c->state = QJACK_STATE_RUNNING;