X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fmid_side_decoder.cc;h=b9b8dd098c9459e2524de2633c36520632631956;hb=4b7185e4eda53534c4d71a1f31ba33ca3dd8dc8d;hp=fe628226151e652f66ee12096d03c4ef295557fb;hpb=fa61fc99549264810e17fcd35abffe9e8ddab5b2;p=dcpomatic.git

diff --git a/src/lib/mid_side_decoder.cc b/src/lib/mid_side_decoder.cc
index fe6282261..b9b8dd098 100644
--- a/src/lib/mid_side_decoder.cc
+++ b/src/lib/mid_side_decoder.cc
@@ -1,19 +1,20 @@
 /*
     Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
 
-    This program is free software; you can redistribute it and/or modify
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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,
+    DCP-o-matic 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.
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
 
 */
 
@@ -40,12 +41,6 @@ MidSideDecoder::id () const
 	return N_("mid-side-decoder");
 }
 
-ChannelCount
-MidSideDecoder::in_channels () const
-{
-	return ChannelCount (2);
-}
-
 int
 MidSideDecoder::out_channels () const
 {
@@ -59,16 +54,27 @@ MidSideDecoder::clone (int) const
 }
 
 shared_ptr<AudioBuffers>
-MidSideDecoder::run (shared_ptr<const AudioBuffers> in)
+MidSideDecoder::run (shared_ptr<const AudioBuffers> in, int channels)
 {
-	shared_ptr<AudioBuffers> out (new AudioBuffers (3, in->frames ()));
+	int const N = min (channels, 3);
+	shared_ptr<AudioBuffers> out (new AudioBuffers (channels, in->frames ()));
 	for (int i = 0; i < in->frames(); ++i) {
 		float const left = in->data()[0][i];
 		float const right = in->data()[1][i];
 		float const mid = (left + right) / 2;
-		out->data()[0][i] = left - mid;
-		out->data()[1][i] = right - mid;
-		out->data()[2][i] = mid;
+		if (N > 0) {
+			out->data()[0][i] = left - mid;
+		}
+		if (N > 1) {
+			out->data()[1][i] = right - mid;
+		}
+		if (N > 2) {
+			out->data()[2][i] = mid;
+		}
+	}
+
+	for (int i = N; i < channels; ++i) {
+		out->make_silent (i);
 	}
 
 	return out;
@@ -89,10 +95,8 @@ MidSideDecoder::input_names () const
 {
 	vector<string> n;
 
-	/// TRANSLATORS: this is the name of the `mid' channel for mid-side decoding
-	n.push_back (_("Mid"));
-	/// TRANSLATORS: this is the name of the `side' channel for mid-side decoding
-	n.push_back (_("Side"));
+	n.push_back (_("Left"));
+	n.push_back (_("Right"));
 
 	return n;
 }