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paaudio: send recorded data in smaller chunks

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Tell PulseAudio to send recorded audio data in smaller chunks
than timer_period, so there's a good chance that qemu can read
recorded audio data every time it looks for new data.

PulseAudio tries to send buffer updates at a fragsize / 2 rate.
With fragsize = timer_period / 2 * 3 the update rate is 75% of
timer_period. The lower limit for the recording buffer size
maxlength is fragsize * 2.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 9315afe5-5958-c0b4-ea1e-14769511a9d5@t-online.de
Message-Id: <20210110100239.27588-19-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin 2021-01-10 11:02:35 +01:00 committed by Gerd Hoffmann
parent 00413ed9c2
commit d9a8b27a7e
1 changed files with 3 additions and 2 deletions
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5
audio/paaudio.c
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@ -568,8 +568,9 @@ static int qpa_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
ss.channels = as->nchannels; ss.channels = as->nchannels;
ss.rate = as->freq; ss.rate = as->freq;
ba.fragsize = pa_usec_to_bytes(ppdo->latency, &ss); ba.fragsize = pa_usec_to_bytes((g->dev->timer_period >> 1) * 3, &ss);
ba.maxlength = pa_usec_to_bytes(ppdo->latency * 2, &ss); ba.maxlength = pa_usec_to_bytes(
MAX(ppdo->latency, g->dev->timer_period * 3), &ss);
ba.minreq = -1; ba.minreq = -1;
ba.prebuf = -1; ba.prebuf = -1;