add a convenient lua forward mapped buffers method

1 files changed, 30 insertions, 0 deletions

diff --git a/libs/ardour/dsp_filter.cc b/libs/ardour/dsp_filter.cc
index d39d03b9b9..7470a583d3 100644
--- a/libs/ardour/dsp_filter.cc
+++ b/libs/ardour/dsp_filter.cc
@@ -21,6 +21,7 @@
 #include <stdlib.h>
 #include <cmath>
 #include "ardour/dB.h"
+#include "ardour/buffer.h"
 #include "ardour/dsp_filter.h"
 
 #ifdef COMPILER_MSVC
@@ -73,6 +74,35 @@ ARDOUR::DSP::peaks (float *data, float &min, float &max, uint32_t n_samples) {
 	}
 }
 
+void
+ARDOUR::DSP::process_map (BufferSet* bufs, const ChanMapping& in, const ChanMapping& out, pframes_t nframes, framecnt_t offset, const DataType& dt)
+{
+	const ChanMapping::Mappings& im (in.mappings());
+	const ChanMapping::Mappings& om (out.mappings());
+
+	for (ChanMapping::Mappings::const_iterator tm = im.begin(); tm != im.end(); ++tm) {
+		if (tm->first != dt) { continue; }
+		for (ChanMapping::TypeMapping::const_iterator i = tm->second.begin(); i != tm->second.end(); ++i) {
+			bool valid;
+			const uint32_t idx = out.get (dt, i->second, &valid);
+			if (valid && idx != i->first) {
+				bufs->get (dt, idx).read_from (bufs->get (dt, i->first), nframes, offset, offset);
+			}
+		}
+	}
+	for (ChanMapping::Mappings::const_iterator tm = im.begin(); tm != im.end(); ++tm) {
+		if (tm->first != dt) { continue; }
+		for (ChanMapping::TypeMapping::const_iterator i = tm->second.begin(); i != tm->second.end(); ++i) {
+			bool valid;
+			in.get_src (dt, i->first, &valid);
+			if (!valid) {
+				bufs->get (dt, i->second).silence (nframes, offset);
+			}
+		}
+	}
+
+}
+
 LowPass::LowPass (double samplerate, float freq)
 	: _rate (samplerate)
 	, _z (0)