From 2ca3009143452669e415237a667f99eb9fc57285 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sat, 9 Sep 2017 02:23:13 +0200
Subject: Allow to send MIDI data directly to a plugin

---
 libs/ardour/ardour/plugin.h        |  5 +++++
 libs/ardour/ardour/plugin_insert.h |  2 ++
 libs/ardour/plugin.cc              | 18 ++++++++++++++++--
 libs/ardour/plugin_insert.cc       | 12 ++++++++++++
 4 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/libs/ardour/ardour/plugin.h b/libs/ardour/ardour/plugin.h
index 419e33e5fa..52fbc71c68 100644
--- a/libs/ardour/ardour/plugin.h
+++ b/libs/ardour/ardour/plugin.h
@@ -33,6 +33,7 @@
 #include "ardour/cycles.h"
 #include "ardour/latent.h"
 #include "ardour/libardour_visibility.h"
+#include "ardour/midi_ring_buffer.h"
 #include "ardour/midi_state_tracker.h"
 #include "ardour/parameter_descriptor.h"
 #include "ardour/types.h"
@@ -159,6 +160,8 @@ class LIBARDOUR_API Plugin : public PBD::StatefulDestructible, public Latent
 		return boost::shared_ptr<ScalePoints>();
 	}
 
+	bool write_immediate_event (size_t size, const uint8_t* buf);
+
 	void realtime_handle_transport_stopped ();
 	void realtime_locate ();
 	void monitoring_changed ();
@@ -379,6 +382,8 @@ private:
 
 	PBD::ScopedConnection _preset_connection;
 
+	MidiRingBuffer<framepos_t> _immediate_events;
+
 	void resolve_midi ();
 };
 
diff --git a/libs/ardour/ardour/plugin_insert.h b/libs/ardour/ardour/plugin_insert.h
index f212528082..a40cdc1bea 100644
--- a/libs/ardour/ardour/plugin_insert.h
+++ b/libs/ardour/ardour/plugin_insert.h
@@ -77,6 +77,8 @@ class LIBARDOUR_API PluginInsert : public Processor
 	bool reset_parameters_to_default ();
 	bool can_reset_all_parameters ();
 
+	bool write_immediate_event (size_t size, const uint8_t* buf);
+
 	int set_block_size (pframes_t nframes);
 
 	ChanMapping input_map (uint32_t num) const {
diff --git a/libs/ardour/plugin.cc b/libs/ardour/plugin.cc
index 7c312011be..64f00cf1c4 100644
--- a/libs/ardour/plugin.cc
+++ b/libs/ardour/plugin.cc
@@ -101,6 +101,7 @@ Plugin::Plugin (AudioEngine& e, Session& s)
 	, _have_presets (false)
 	, _have_pending_stop_events (false)
 	, _parameter_changed_since_last_preset (false)
+	, _immediate_events(6096) // FIXME: size?
 {
 	_pending_stop_events.ensure_buffers (DataType::MIDI, 1, 4096);
 }
@@ -116,6 +117,7 @@ Plugin::Plugin (const Plugin& other)
 	, _have_presets (false)
 	, _have_pending_stop_events (false)
 	, _parameter_changed_since_last_preset (false)
+	, _immediate_events(6096) // FIXME: size?
 {
 	_pending_stop_events.ensure_buffers (DataType::MIDI, 1, 4096);
 }
@@ -345,16 +347,28 @@ Plugin::preset_by_uri (const string& uri)
 	}
 }
 
+bool
+Plugin::write_immediate_event (size_t size, const uint8_t* buf)
+{
+	if (!Evoral::midi_event_is_valid (buf, size)) {
+		return false;
+	}
+	return (_immediate_events.write (0, Evoral::MIDI_EVENT, size, buf) == size);
+}
+
 int
 Plugin::connect_and_run (BufferSet& bufs,
 		framepos_t /*start*/, framepos_t /*end*/, double /*speed*/,
 		ChanMapping /*in_map*/, ChanMapping /*out_map*/,
-		pframes_t /* nframes */, framecnt_t /*offset*/)
+		pframes_t nframes, framecnt_t /*offset*/)
 {
 	if (bufs.count().n_midi() > 0) {
 
-		/* Track notes that we are sending to the plugin */
+		if (_immediate_events.read_space() && nframes > 0) {
+			_immediate_events.read (bufs.get_midi (0), 0, 1, nframes - 1, true);
+		}
 
+		/* Track notes that we are sending to the plugin */
 		const MidiBuffer& b = bufs.get_midi (0);
 
 		_tracker.track (b.begin(), b.end());
diff --git a/libs/ardour/plugin_insert.cc b/libs/ardour/plugin_insert.cc
index 2afd18d199..ce05d6c298 100644
--- a/libs/ardour/plugin_insert.cc
+++ b/libs/ardour/plugin_insert.cc
@@ -705,6 +705,18 @@ PluginInsert::bypassable_changed ()
 	BypassableChanged ();
 }
 
+bool
+PluginInsert::write_immediate_event (size_t size, const uint8_t* buf)
+{
+	bool rv = true;
+	for (Plugins::iterator i = _plugins.begin(); i != _plugins.end(); ++i) {
+		if (!(*i)->write_immediate_event (size, buf)) {
+			rv = false;
+		}
+	}
+	return rv;
+}
+
 void
 PluginInsert::preset_load_set_value (uint32_t p, float v)
 {
-- 
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