From 195a3d15e490465b64a19d2f09e8a2d8d81e2b2a Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Mon, 6 Jun 2016 20:26:13 +0200
Subject: Add basic latency reporting methods.

---
 plugin/drumgizmo_plugin.cc |  2 ++
 src/chresampler.cc         | 14 ++++++++++++++
 src/chresampler.h          |  7 +++++++
 src/drumgizmo.cc           |  5 +++++
 src/drumgizmo.h            |  3 +++
 src/inputprocessor.cc      | 13 ++++++-------
 src/inputprocessor.h       |  7 ++++++-
 7 files changed, 43 insertions(+), 8 deletions(-)

diff --git a/plugin/drumgizmo_plugin.cc b/plugin/drumgizmo_plugin.cc
index 5c94db4..7202770 100644
--- a/plugin/drumgizmo_plugin.cc
+++ b/plugin/drumgizmo_plugin.cc
@@ -127,6 +127,8 @@ void DrumGizmoPlugin::process(size_t pos,
                               const std::vector<float*>& output_samples,
                               size_t count)
 {
+	setLatency(drumgizmo->getLatency());
+
 	this->input_events = &input_events;
 	this->output_samples = &output_samples;
 
diff --git a/src/chresampler.cc b/src/chresampler.cc
index c8323de..c3c19bf 100644
--- a/src/chresampler.cc
+++ b/src/chresampler.cc
@@ -139,6 +139,15 @@ void CHResampler::process()
 #endif
 }
 
+std::size_t CHResampler::getLatency() const
+{
+#if defined(USE_ZITA)
+	return prv->zita.inpdist();
+#elif defined(USE_SRC)
+	return 0; // TODO?
+#endif
+}
+
 std::size_t CHResampler::getInputSampleCount() const
 {
 #if defined(USE_ZITA)
@@ -172,6 +181,11 @@ void CHResampler::setInputSamples(float*, std::size_t) {}
 void CHResampler::setOutputSamples(float*, std::size_t) {}
 void CHResampler::process() {}
 
+std::size_t CHResampler::getLatency() const
+{
+	return 0;
+}
+
 std::size_t CHResampler::getInputSampleCount() const
 {
 	return 0;
diff --git a/src/chresampler.h b/src/chresampler.h
index 4148aee..d21d1cb 100644
--- a/src/chresampler.h
+++ b/src/chresampler.h
@@ -48,6 +48,8 @@ public:
 
 	void process();
 
+	std::size_t getLatency() const;
+
 	std::size_t getInputSampleCount() const;
 	std::size_t getOutputSampleCount() const;
 
@@ -96,5 +98,10 @@ public:
 		return resamplers[0].getOutputSampleCount();
 	}
 
+	std::size_t getLatency() const
+	{
+		return resamplers[0].getLatency();
+	}
+
 	std::array<CHResampler, 64> resamplers;
 };
diff --git a/src/drumgizmo.cc b/src/drumgizmo.cc
index ef4d3b6..a1278a1 100644
--- a/src/drumgizmo.cc
+++ b/src/drumgizmo.cc
@@ -410,6 +410,11 @@ void DrumGizmo::stop()
 	// engine.stop();
 }
 
+std::size_t DrumGizmo::getLatency() const
+{
+	return input_processor.getLatency() + resamplers.getLatency();
+}
+
 int DrumGizmo::samplerate()
 {
 	return settings.samplerate.load();
diff --git a/src/drumgizmo.h b/src/drumgizmo.h
index 3f2d17c..63c0fb6 100644
--- a/src/drumgizmo.h
+++ b/src/drumgizmo.h
@@ -64,6 +64,9 @@ public:
 	std::string configString();
 	bool setConfigString(std::string cfg);
 
+	//! Get the current engine latency in samples.
+	std::size_t getLatency() const;
+
 	int samplerate();
 	void setSamplerate(int samplerate);
 
diff --git a/src/inputprocessor.cc b/src/inputprocessor.cc
index 1676090..b83855f 100644
--- a/src/inputprocessor.cc
+++ b/src/inputprocessor.cc
@@ -61,13 +61,18 @@ bool InputProcessor::process(const std::vector<event_t>& events, size_t pos, dou
 	return true;
 }
 
+std::size_t InputProcessor::getLatency() const
+{
+	return 0;
+}
+
 bool InputProcessor::processOnset(const event_t& event, size_t pos, double resample_ratio)
 {
 	if(!kit.isValid()) {
 		return false;
 	}
 
-	size_t ev_instr = event.instrument; 
+	size_t ev_instr = event.instrument;
 	Instrument* instr = nullptr;
 
 	if(ev_instr < kit.instruments.size())
@@ -115,12 +120,6 @@ bool InputProcessor::processOnset(const event_t& event, size_t pos, double resam
 	for(Channel& ch: kit.channels)
 	{
 		AudioFile* af = sample->getAudioFile(&ch);
-		if(af != nullptr)
-		{
-			// LAZYLOAD:
-			// DEBUG(inputprocessor, "Requesting preparing of audio file\n");
-			// loader.prepare(af);
-		}
 		if(af == nullptr || !af->isValid())
 		{
 			//DEBUG(inputprocessor, "Missing AudioFile.\n");
diff --git a/src/inputprocessor.h b/src/inputprocessor.h
index da370ec..83a4f5b 100644
--- a/src/inputprocessor.h
+++ b/src/inputprocessor.h
@@ -37,7 +37,12 @@ class InputProcessor
 {
 public:
 	InputProcessor(DrumKit& kit, std::list<Event*>* activeevents);
-	bool process(const std::vector<event_t>& events, size_t pos, double resample_ratio);
+
+	bool process(const std::vector<event_t>& events, size_t pos,
+	             double resample_ratio);
+
+	std::size_t getLatency() const;
+
 private:
 	DrumKit& kit;
 	std::list<Event*>* activeevents;
-- 
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