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[PATCH v3 06/15] jackaudio: use more jack audio buffers
From: |
Volker Rümelin |
Subject: |
[PATCH v3 06/15] jackaudio: use more jack audio buffers |
Date: |
Tue, 1 Mar 2022 20:13:02 +0100 |
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 <vr_qemu@t-online.de>
---
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;
--
2.34.1
- [PATCH v3 00/15] reduce audio playback latency, Volker Rümelin, 2022/03/01
- [PATCH v3 01/15] audio: replace open-coded buffer arithmetic, Volker Rümelin, 2022/03/01
- [PATCH v3 02/15] audio: move function audio_pcm_hw_clip_out(), Volker Rümelin, 2022/03/01
- [PATCH v3 03/15] audio: add function audio_pcm_hw_conv_in(), Volker Rümelin, 2022/03/01
- [PATCH v3 05/15] paaudio: increase default latency to 46ms, Volker Rümelin, 2022/03/01
- [PATCH v3 07/15] audio: copy playback stream in sequential order, Volker Rümelin, 2022/03/01
- [PATCH v3 06/15] jackaudio: use more jack audio buffers,
Volker Rümelin <=
- [PATCH v3 04/15] audio: inline function audio_pcm_sw_get_rpos_in(), Volker Rümelin, 2022/03/01
- [PATCH v3 08/15] audio: add pcm_ops function table for capture backend, Volker Rümelin, 2022/03/01
- [PATCH v3 09/15] Revert "audio: fix wavcapture segfault", Volker Rümelin, 2022/03/01
- [PATCH v3 14/15] paaudio: fix samples vs. frames mix-up, Volker Rümelin, 2022/03/01
- [PATCH v3 13/15] ossaudio: reduce effective playback buffer size, Volker Rümelin, 2022/03/01
- [PATCH v3 10/15] audio: restore mixing-engine playback buffer size, Volker Rümelin, 2022/03/01
- [PATCH v3 11/15] paaudio: reduce effective playback buffer size, Volker Rümelin, 2022/03/01