Add UpmixerB.

1 files changed, 86 insertions, 0 deletions

diff --git a/src/lib/audio_delay.cc b/src/lib/audio_delay.cc
new file mode 100644
index 000000000..076d10d6f
--- /dev/null
+++ b/src/lib/audio_delay.cc
@@ -0,0 +1,86 @@
+/*
+    Copyright (C) 2015 Carl Hetherington <cth@carlh.net>
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "audio_delay.h"
+#include "audio_buffers.h"
+#include "dcpomatic_assert.h"
+#include <iostream>
+
+using std::cout;
+using boost::shared_ptr;
+
+AudioDelay::AudioDelay (int samples)
+	: _samples (samples)
+{
+
+}
+
+shared_ptr<AudioBuffers>
+AudioDelay::run (shared_ptr<const AudioBuffers> in)
+{
+	/* You can't call this with varying channel counts */
+	DCPOMATIC_ASSERT (!_tail || in->channels() == _tail->channels());
+
+	shared_ptr<AudioBuffers> out (new AudioBuffers (in->channels(), in->frames()));
+
+	if (in->frames() > _samples) {
+
+		if (!_tail) {
+			/* No tail; use silence */
+			out->make_silent (0, _samples);
+		} else {
+			/* Copy tail */
+			out->copy_from (_tail.get(), _samples, 0, 0);
+		}
+
+		/* Copy in to out */
+		out->copy_from (in.get(), in->frames() - _samples, 0, _samples);
+
+		/* Keep tail */
+		if (!_tail) {
+			_tail.reset (new AudioBuffers (in->channels(), _samples));
+		}
+		_tail->copy_from (in.get(), _samples, in->frames() - _samples, 0);
+
+	} else {
+
+		/* First part of the tail into the output */
+		if (_tail) {
+			out->copy_from (_tail.get(), out->frames(), 0, 0);
+		} else {
+			out->make_silent ();
+			_tail.reset (new AudioBuffers (out->channels(), _samples));
+			_tail->make_silent ();
+		}
+
+		/* Shuffle the tail down */
+		_tail->move (out->frames(), 0, _tail->frames() - out->frames());
+
+		/* Copy input into the tail */
+		_tail->copy_from (in.get(), in->frames(), 0, _tail->frames() - in->frames());
+	}
+
+	return out;
+}
+
+void
+AudioDelay::flush ()
+{
+	_tail.reset ();
+}