Add polarity-invert processor

1 files changed, 80 insertions, 0 deletions

diff --git a/libs/ardour/polarity_processor.cc b/libs/ardour/polarity_processor.cc
new file mode 100644
index 0000000000..5604cd4000
--- /dev/null
+++ b/libs/ardour/polarity_processor.cc
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#include "ardour/audio_buffer.h"
+#include "ardour/phase_control.h"
+#include "ardour/polarity_processor.h"
+
+#include "pbd/i18n.h"
+
+using namespace ARDOUR;
+using namespace PBD;
+
+PolarityProcessor::PolarityProcessor (Session& s, boost::shared_ptr<PhaseControl> control)
+	: Processor(s, "Polarity")
+	, _control (control)
+{
+}
+
+bool
+PolarityProcessor::can_support_io_configuration (const ChanCount& in, ChanCount& out)
+{
+	out = in;
+	return true;
+}
+
+bool
+PolarityProcessor::configure_io (ChanCount in, ChanCount out)
+{
+	if (out != in) { // always 1:1
+		return false;
+	}
+
+	return Processor::configure_io (in, out);
+}
+
+void
+PolarityProcessor::run (BufferSet& bufs, samplepos_t /*start_sample*/, samplepos_t /*end_sample*/, double /*speed*/, pframes_t nframes, bool)
+{
+	if (!_active && !_pending_active) {
+		return;
+	}
+	_active = _pending_active;
+
+	if (_control->none()) {
+		return;
+	}
+	int chn = 0;
+
+	for (BufferSet::audio_iterator i = bufs.audio_begin(); i != bufs.audio_end(); ++i, ++chn) {
+		Sample* const sp = i->data();
+		if (_control->inverted (chn)) {
+			for (pframes_t nx = 0; nx < nframes; ++nx) {
+				sp[nx] = -sp[nx];
+			}
+		}
+	}
+}
+
+XMLNode&
+PolarityProcessor::state ()
+{
+	XMLNode& node (Processor::state ());
+	node.set_property("type", "polarity");
+	return node;
+}