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Sync VST2 audio thread scheduling priorities

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We'll periodically copy the scheduling priorities from the host's audio
threads to the Wine plugin host's audio threads. The overhead of doing
this is about 1 microsecond on my system, so doing this every cycle
really adds up. But getting the Unix epoch time and comparing some
timestamps has a neglegible overhead, so this should give you the best
of both worlds.

Next we'll do the same thing for VST3 plugins.

As suggested by @jhernberg
This commit is contained in:
Robbert van der Helm
2021-01-23 15:05:03 +01:00
parent 96511ca8a3
commit f03b9b1497
7 changed files with 58 additions and 8 deletions
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src/wine-host/bridges/vst2.cpp
+13 -4
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@@ -168,6 +168,13 @@ Vst2Bridge::Vst2Bridge(MainContext& main_context,
sockets.host_vst_process_replacing.receive_multi<AudioBuffers>(
[&](AudioBuffers request, std::vector<uint8_t>& buffer) {
// As suggested by Jack Winter, we'll synchronize this thread's
// audio processing priority with that of the host's audio
// thread every once in a while
if (request.new_realtime_priority) {
set_realtime_priority(true, *request.new_realtime_priority);
}
// Let the plugin process the MIDI events that were received
// since the last buffer, and then clean up those events. This
// approach should not be needed but Kontakt only stores
@@ -237,8 +244,9 @@ Vst2Bridge::Vst2Bridge(MainContext& main_context,
}
AudioBuffers response{
output_buffers_single_precision,
request.sample_frames};
.buffers = output_buffers_single_precision,
.sample_frames = request.sample_frames,
.new_realtime_priority = std::nullopt};
sockets.host_vst_process_replacing.send(response,
buffer);
},
@@ -264,8 +272,9 @@ Vst2Bridge::Vst2Bridge(MainContext& main_context,
request.sample_frames);
AudioBuffers response{
output_buffers_double_precision,
request.sample_frames};
.buffers = output_buffers_double_precision,
.sample_frames = request.sample_frames,
.new_realtime_priority = std::nullopt};
sockets.host_vst_process_replacing.send(response,
buffer);
}},