https://bugs.freedesktop.org/show_bug.cgi?id=54007
Bug #: 54007
Summary: The alsa sink does larger rewind than needed when the
configured sink latency changes
Classification: Unclassified
Product: PulseAudio
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: minor
Priority: medium
Component: alsa
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
CC: [email protected]
If a sink supports dynamic latency and the latency is adjusted downwards, there
needs to be a rewind to ensure that the sink buffer doesn't contain more data
than what is allowed by the new latency. This is because rewind requests can't
be larger than the configured latency, and if there's more data than that in
the buffer, a later rewind request may end up being too small.
The alsa sink requests the rewind in sink_update_requested_latency_cb():
if (u->hwbuf_unused > before) {
pa_log_debug("Requesting rewind due to latency change.");
pa_sink_request_rewind(s, (size_t) -1);
}
Doing a full rewind (-1 as the rewind amount) is not necessary, as far as I can
see. It would be sufficient to rewind only by the difference between the old
and new latency.
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