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💥 Reimplement VST3 audio processing

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In the same way as 50c25c1cf0 did it for
VST2 plugins. Input and output audio data is now stored in a shared
memory buffer instead of being sent over the sockets. This reduces the
bridging overhead to a minimum since copying data was the most expensive
operation we were doing and we now only need to copy the entire buffer
once per processing cycle.
This commit is contained in:
Robbert van der Helm
2021-06-11 13:56:42 +02:00
parent a7d8063db4
commit dec19dc12a
8 changed files with 444 additions and 363 deletions
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src/plugin/bridges/vst3-impls/plugin-proxy.cpp
+23 -8
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@@ -182,11 +182,19 @@ uint32 PLUGIN_API Vst3PluginProxyImpl::getLatencySamples() {
tresult PLUGIN_API
Vst3PluginProxyImpl::setupProcessing(Steinberg::Vst::ProcessSetup& setup) {
// TOOD: Set up the shared audio buffers next
return bridge
.send_audio_processor_message(YaAudioProcessor::SetupProcessing{
.instance_id = instance_id(), .setup = setup})
.result;
const YaAudioProcessor::SetupProcessingResponse response =
bridge.send_audio_processor_message(YaAudioProcessor::SetupProcessing{
.instance_id = instance_id(), .setup = setup});
// We have now set up the shared audio buffers on the Wine side, and we'll
// be able to able to connect to them by using the same audio configuration
if (!process_buffers) {
process_buffers.emplace(response.audio_buffers_config);
} else {
process_buffers->resize(response.audio_buffers_config);
}
return response.result;
}
tresult PLUGIN_API Vst3PluginProxyImpl::setProcessing(TBool state) {
@@ -220,9 +228,12 @@ Vst3PluginProxyImpl::process(Steinberg::Vst::ProcessData& data) {
last_audio_thread_priority_synchronization = now;
}
// We reuse this existing object to avoid allocations
// We reuse this existing object to avoid allocations.
// `YaProcessData::repopulate()` will write the input audio to the shared
// audio buffers, so they're not stored within the request object itself.
assert(process_buffers);
process_request.instance_id = instance_id();
process_request.data.repopulate(data);
process_request.data.repopulate(data, *process_buffers);
process_request.new_realtime_priority = new_realtime_priority;
// HACK: This is a bit ugly. This `YaProcessData::Response` object actually
@@ -245,7 +256,11 @@ Vst3PluginProxyImpl::process(Steinberg::Vst::ProcessData& data) {
MessageReference<YaAudioProcessor::Process>(process_request),
process_response);
process_request.data.write_back_outputs(data);
// At this point the shared audio buffers should contain the output audio,
// so we'll write that back to the host along with any metadata (which in
// practice are only the silence flags), as well as any output parameter
// changes and events
process_request.data.write_back_outputs(data, *process_buffers);
return process_response.result;
}