Implement basic libardour convolution DSP

1 files changed, 67 insertions, 0 deletions

diff --git a/libs/ardour/ardour/convolver.h b/libs/ardour/ardour/convolver.h
new file mode 100644
index 0000000000..9d858a1e63
--- /dev/null
+++ b/libs/ardour/ardour/convolver.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2018 Robin Gareus <robin@gareus.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
+#ifndef _ardour_convolver_h_
+#define _ardour_convolver_h_
+
+#include <vector>
+
+#include "zita-convolver/zita-convolver.h"
+
+#include "ardour/libardour_visibility.h"
+#include "ardour/readable.h"
+
+namespace ARDOUR { namespace DSP {
+
+class LIBARDOUR_API Convolver : public SessionHandleRef {
+public:
+
+	enum IRChannelConfig {
+		Mono,         ///< 1 in, 1 out; 1ch IR
+		MonoToStereo, ///< 1 in, 2 out, stereo IR  M -> L, M -> R
+		Stereo,       ///< 2 in, 2 out, stereo IR  L -> L, R -> R || 4 chan IR  L -> L, L -> R, R -> R, R -> L
+	};
+
+	Convolver (Session&, std::string const&, IRChannelConfig irc = Mono, uint32_t pre_delay = 0);
+
+	void run (float*, uint32_t);
+	void run_stereo (float* L, float* R, uint32_t);
+
+	uint32_t latency () const { return _n_samples; }
+
+	uint32_t n_inputs  () const { return _irc < Stereo ? 1 : 2; }
+	uint32_t n_outputs () const { return _irc == Mono  ? 1 : 2; }
+
+	bool ready () const;
+
+private:
+	void reconfigure ();
+	std::vector<boost::shared_ptr<Readable> > _readables;
+	ArdourZita::Convproc _convproc;
+
+	IRChannelConfig _irc;
+	uint32_t _initial_delay;
+
+	uint32_t _n_samples;
+	uint32_t _max_size;
+	uint32_t _offset;
+	bool     _configured;
+};
+
+} } /* namespace */
+#endif