2 Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 #include "upmixer_a.h"
23 #include "audio_buffers.h"
24 #include "audio_mapping.h"
29 using std::make_shared;
31 using std::shared_ptr;
36 UpmixerA::UpmixerA (int sampling_rate)
37 : _left (0.02, 1900.0 / sampling_rate, 4800.0 / sampling_rate)
38 , _right (0.02, 1900.0 / sampling_rate, 4800.0 / sampling_rate)
39 , _centre (0.01, 150.0 / sampling_rate, 1900.0 / sampling_rate)
40 , _lfe (0.01, 150.0 / sampling_rate)
41 , _ls (0.02, 4800.0 / sampling_rate, 20000.0 / sampling_rate)
42 , _rs (0.02, 4800.0 / sampling_rate, 20000.0 / sampling_rate)
49 UpmixerA::name () const
51 return _("Stereo to 5.1 up-mixer A");
58 return N_("stereo-5.1-upmix-a");
63 UpmixerA::out_channels () const
69 shared_ptr<AudioProcessor>
70 UpmixerA::clone (int sampling_rate) const
72 return make_shared<UpmixerA>(sampling_rate);
76 shared_ptr<AudioBuffers>
77 UpmixerA::run (shared_ptr<const AudioBuffers> in, int channels)
80 auto in_L = in->channel (0);
81 auto in_R = in->channel (1);
83 /* Mix of L and R; -6dB down in amplitude (3dB in terms of power) */
84 auto in_LR = in_L->clone ();
85 in_LR->accumulate_frames (in_R.get(), in_R->frames(), 0, 0);
86 in_LR->apply_gain (-6);
89 vector<shared_ptr<AudioBuffers>> all_out;
90 all_out.push_back (_left.run(in_L));
91 all_out.push_back (_right.run(in_R));
92 all_out.push_back (_centre.run(in_LR));
93 all_out.push_back (_lfe.run(in_LR));
94 all_out.push_back (_ls.run(in_L));
95 all_out.push_back (_rs.run(in_R));
97 auto out = make_shared<AudioBuffers>(channels, in->frames());
98 int const N = min (channels, 6);
100 for (int i = 0; i < N; ++i) {
101 out->copy_channel_from (all_out[i].get(), 0, i);
104 for (int i = N; i < channels; ++i) {
105 out->make_silent (i);
124 UpmixerA::make_audio_mapping_default (AudioMapping& mapping) const
126 /* Just map the first two input channels to our L/R */
127 mapping.make_zero ();
128 for (int i = 0; i < min (2, mapping.input_channels()); ++i) {
129 mapping.set (i, i, 1);
135 UpmixerA::input_names () const
138 NamedChannel(_("Upmix L"), 0),
139 NamedChannel(_("Upmix R"), 1)