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jackaudio: use more jack audio buffers
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> Reviewed-by: Christian Schoenebeck <qemu_oss@crudebyte.com> Message-Id: <20220301191311.26695-6-vr_qemu@t-online.de> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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@ -483,8 +483,8 @@ static int qjack_client_init(QJackClient *c)
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c->buffersize = 512;
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c->buffersize = 512;
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}
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}
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/* create a 2 period buffer */
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/* create a 3 period buffer */
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qjack_buffer_create(&c->fifo, c->nchannels, c->buffersize * 2);
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qjack_buffer_create(&c->fifo, c->nchannels, c->buffersize * 3);
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qjack_client_connect_ports(c);
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qjack_client_connect_ports(c);
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c->state = QJACK_STATE_RUNNING;
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c->state = QJACK_STATE_RUNNING;
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