From fd4c35d46a63b22795e526d1e0375a9b2d6d441c Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Mon, 13 Jan 2020 08:34:37 +0100
Subject: Add rubberband Lua bindings to process ardour regions

---
 libs/ardour/ardour/lua_api.h | 45 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'libs/ardour/ardour')

diff --git a/libs/ardour/ardour/lua_api.h b/libs/ardour/ardour/lua_api.h
index bed9db5aa2..4d3bd38080 100644
--- a/libs/ardour/ardour/lua_api.h
+++ b/libs/ardour/ardour/lua_api.h
@@ -22,12 +22,15 @@
 #include <string>
 #include <lo/lo.h>
 #include <boost/shared_ptr.hpp>
+#include <boost/enable_shared_from_this.hpp>
+#include <rubberband/RubberBandStretcher.h>
 #include <vamp-hostsdk/Plugin.h>
 
 #include "evoral/Note.h"
 
 #include "ardour/libardour_visibility.h"
 
+#include "ardour/audioregion.h"
 #include "ardour/midi_model.h"
 #include "ardour/processor.h"
 #include "ardour/session.h"
@@ -306,6 +309,48 @@ namespace ARDOUR { namespace LuaAPI {
 
 	};
 
+	class Rubberband : public Readable , public boost::enable_shared_from_this<Rubberband>
+	{
+		public:
+			Rubberband (boost::shared_ptr<AudioRegion>, bool percussive);
+			~Rubberband ();
+			bool set_strech_and_pitch (double stretch_ratio, double pitch_ratio);
+			bool set_mapping (luabridge::LuaRef tbl);
+			boost::shared_ptr<AudioRegion> process (luabridge::LuaRef cb);
+			boost::shared_ptr<Readable> readable ();
+
+			/* readable API */
+			samplecnt_t readable_length () const { return _read_len; }
+			uint32_t n_channels () const { return _n_channels; }
+			samplecnt_t read (Sample*, samplepos_t pos, samplecnt_t cnt, int channel) const;
+
+		private:
+			Rubberband (Rubberband const&); // no copy construction
+			bool read_region (bool study);
+			bool retrieve (float**);
+			void cleanup (bool abort);
+			boost::shared_ptr<AudioRegion> finalize ();
+
+			boost::shared_ptr<AudioRegion> _region;
+
+			uint32_t    _n_channels;
+			samplecnt_t _read_len;
+			samplecnt_t _read_start;
+			samplecnt_t _read_offset;
+
+			std::vector<boost::shared_ptr<AudioSource> > _asrc;
+
+			RubberBand::RubberBandStretcher _rbs;
+			std::map<size_t, size_t>        _mapping;
+
+			double _stretch_ratio;
+			double _pitch_ratio;
+
+			luabridge::LuaRef*            _cb;
+			boost::shared_ptr<Rubberband> _self;
+			static const samplecnt_t      _bufsize;
+	};
+
 	boost::shared_ptr<Evoral::Note<Temporal::Beats> >
 		new_noteptr (uint8_t, Temporal::Beats, Temporal::Beats, uint8_t, uint8_t);
 
-- 
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