Add a fixed (not de-clicked) multi-buffer audio/midi delayline.

A ringbuffer intended to be used for plugin-thru/bypass
latency compensation.

1 files changed, 67 insertions, 0 deletions

diff --git a/libs/ardour/ardour/fixed_delay.h b/libs/ardour/ardour/fixed_delay.h
new file mode 100644
index 0000000000..c98b40c315
--- /dev/null
+++ b/libs/ardour/ardour/fixed_delay.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2016 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_fixed_delay_h__
+#define __ardour_fixed_delay_h__
+
+#include <vector>
+#include "ardour/buffer.h"
+
+namespace ARDOUR {
+
+class ChanCount;
+
+class LIBARDOUR_API FixedDelay
+{
+public:
+	FixedDelay ();
+	~FixedDelay ();
+
+	void configure (const ChanCount& count, framecnt_t);
+	void set (const ChanCount& count, framecnt_t);
+
+	void delay (ARDOUR::DataType, uint32_t, Buffer&, const Buffer&, pframes_t, framecnt_t dst_offset = 0, framecnt_t src_offset = 0);
+	void flush() { _pending_flush = true; }
+
+private:
+	framecnt_t _max_delay;
+	framecnt_t _delay;
+	bool       _pending_flush;
+	ChanCount  _count;
+
+	struct DelayBuffer {
+		public:
+		DelayBuffer () : buf (0), pos (0) {}
+		DelayBuffer (DataType dt, size_t capacity)
+			: buf (Buffer::create (dt, capacity)), pos (0) {}
+		~DelayBuffer () { delete buf; }
+		Buffer * buf;
+		framepos_t pos;
+	};
+
+	typedef std::vector<DelayBuffer*> BufferVec;
+	// Vector of vectors, indexed by DataType
+	std::vector<BufferVec> _buffers;
+
+	void ensure_buffers(DataType type, size_t num_buffers, size_t buffer_capacity);
+	void clear ();
+};
+
+} // namespace ARDOUR
+
+#endif // __ardour_fixed_delay_h__