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/*
Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "upmixer_a.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;
UpmixerA::UpmixerA (int sampling_rate)
: _left (0.02, 1900.0 / sampling_rate, 4800.0 / sampling_rate)
, _right (0.02, 1900.0 / sampling_rate, 4800.0 / sampling_rate)
, _centre (0.01, 150.0 / sampling_rate, 1900.0 / sampling_rate)
, _lfe (0.01, 150.0 / sampling_rate)
, _ls (0.02, 4800.0 / sampling_rate, 20000.0 / sampling_rate)
, _rs (0.02, 4800.0 / sampling_rate, 20000.0 / sampling_rate)
{
}
string
UpmixerA::name () const
{
return _("Stereo to 5.1 up-mixer A");
}
string
UpmixerA::id () const
{
return N_("stereo-5.1-upmix-a");
}
int
UpmixerA::out_channels () const
{
return 6;
}
shared_ptr<AudioProcessor>
UpmixerA::clone (int sampling_rate) const
{
return shared_ptr<AudioProcessor> (new UpmixerA (sampling_rate));
}
shared_ptr<AudioBuffers>
UpmixerA::run (shared_ptr<const AudioBuffers> in, int channels)
{
/* Input L and R */
shared_ptr<AudioBuffers> in_L = in->channel (0);
shared_ptr<AudioBuffers> in_R = in->channel (1);
/* Mix of L and R; -6dB down in amplitude (3dB in terms of power) */
shared_ptr<AudioBuffers> in_LR = in_L->clone ();
in_LR->accumulate_frames (in_R.get(), 0, 0, in_R->frames ());
in_LR->apply_gain (-6);
/* Run filters */
vector<shared_ptr<AudioBuffers> > all_out;
all_out.push_back (_left.run (in_L));
all_out.push_back (_right.run (in_R));
all_out.push_back (_centre.run (in_LR));
all_out.push_back (_lfe.run (in_LR));
all_out.push_back (_ls.run (in_L));
all_out.push_back (_rs.run (in_R));
shared_ptr<AudioBuffers> out (new AudioBuffers (channels, in->frames ()));
int const N = min (channels, 6);
for (int i = 0; i < N; ++i) {
out->copy_channel_from (all_out[i].get(), 0, i);
}
for (int i = N; i < channels; ++i) {
out->make_silent (i);
}
return out;
}
void
UpmixerA::flush ()
{
_left.flush ();
_right.flush ();
_centre.flush ();
_lfe.flush ();
_ls.flush ();
_rs.flush ();
}
void
UpmixerA::make_audio_mapping_default (AudioMapping& mapping) const
{
/* Just map the first two input channels to our L/R */
mapping.make_zero ();
for (int i = 0; i < min (2, mapping.input_channels()); ++i) {
mapping.set (i, i, 1);
}
}
vector<string>
UpmixerA::input_names () const
{
vector<string> n;
n.push_back (_("Upmix L"));
n.push_back (_("Upmix R"));
return n;
}
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