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/*
Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
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.
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 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
MidSideDecoder::name () const
{
return _("Mid-side decoder");
}
string
MidSideDecoder::id () const
{
return N_("mid-side-decoder");
}
int
MidSideDecoder::out_channels () const
{
return 3;
}
shared_ptr<AudioProcessor>
MidSideDecoder::clone (int) const
{
return shared_ptr<AudioProcessor> (new MidSideDecoder ());
}
shared_ptr<AudioBuffers>
MidSideDecoder::run (shared_ptr<const AudioBuffers> in, int channels)
{
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;
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<NamedChannel>
MidSideDecoder::input_names () const
{
vector<NamedChannel> n;
n.push_back (NamedChannel(_("Left"), 0));
n.push_back (NamedChannel(_("Right"), 1));
return n;
}
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