/*
- Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
+ 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/>.
*/
#include "mid_side_decoder.h"
#include "audio_buffers.h"
+#include "audio_mapping.h"
#include "i18n.h"
using std::string;
+using std::min;
+using std::vector;
using boost::shared_ptr;
string
return N_("mid-side-decoder");
}
-ChannelCount
-MidSideDecoder::in_channels () const
-{
- return ChannelCount (2);
-}
-
int
-MidSideDecoder::out_channels (int) const
+MidSideDecoder::out_channels () const
{
return 3;
}
}
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;
}
+
+void
+MidSideDecoder::make_audio_mapping_default (AudioMapping& mapping) const
+{
+ /* Just map the first two input channels to our M/S */
+ mapping.make_zero ();
+ for (int i = 0; i < min (2, mapping.input_channels()); ++i) {
+ mapping.set (i, i, 1);
+ }
+}
+
+vector<string>
+MidSideDecoder::input_names () const
+{
+ vector<string> n;
+
+ n.push_back (_("Left"));
+ n.push_back (_("Right"));
+
+ return n;
+}