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pulseaudio: setup buffer attrs
Request reasonable buffer sizes from pulseaudio. Without this pa_simple_write() can block quite long and lead to dropouts, especially with guests which use small audio ring buffers. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: malc <av1474@comtv.ru>
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@ -289,6 +289,7 @@ static int qpa_init_out (HWVoiceOut *hw, struct audsettings *as)
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{
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int error;
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static pa_sample_spec ss;
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static pa_buffer_attr ba;
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struct audsettings obt_as = *as;
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PAVoiceOut *pa = (PAVoiceOut *) hw;
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@ -296,6 +297,15 @@ static int qpa_init_out (HWVoiceOut *hw, struct audsettings *as)
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ss.channels = as->nchannels;
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ss.rate = as->freq;
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/*
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* qemu audio tick runs at 250 Hz (by default), so processing
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* data chunks worth 4 ms of sound should be a good fit.
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*/
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ba.tlength = pa_usec_to_bytes (4 * 1000, &ss);
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ba.minreq = pa_usec_to_bytes (2 * 1000, &ss);
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ba.maxlength = -1;
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ba.prebuf = -1;
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obt_as.fmt = pa_to_audfmt (ss.format, &obt_as.endianness);
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pa->s = pa_simple_new (
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@ -306,7 +316,7 @@ static int qpa_init_out (HWVoiceOut *hw, struct audsettings *as)
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"pcm.playback",
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&ss,
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NULL, /* channel map */
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NULL, /* buffering attributes */
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&ba, /* buffering attributes */
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&error
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);
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if (!pa->s) {
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