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paaudio: limit minreq to 75% of audio timer_rate

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Currently with the playback buffer attribute minreq = -1 and flag
PA_STREAM_EARLY_REQUESTS PulseAudio uses minreq = tlength / 4.
To improve audio playback with larger PulseAudio server side
buffers, limit minreq to a maximum of 75% of audio timer_rate.
That way there is a good chance qemu receives a stream buffer
size update before it tries to write data to the playback stream.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 9315afe5-5958-c0b4-ea1e-14769511a9d5@t-online.de
Message-Id: <20210110100239.27588-18-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin 2021-01-10 11:02:34 +01:00 committed by Gerd Hoffmann
parent cffd2fdf2c
commit 00413ed9c2
1 changed files with 2 additions and 1 deletions
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audio/paaudio.c
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@ -517,7 +517,8 @@ static int qpa_init_out(HWVoiceOut *hw, struct audsettings *as,
ss.rate = as->freq;
ba.tlength = pa_usec_to_bytes(ppdo->latency, &ss);
ba.minreq = -1;
ba.minreq = pa_usec_to_bytes(MIN(ppdo->latency >> 2,
(g->dev->timer_period >> 2) * 3), &ss);
ba.maxlength = -1;
ba.prebuf = -1;