2 Copyright (C) 2015-2021 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_b.h"
23 #include "audio_buffers.h"
24 #include "audio_mapping.h"
30 using std::make_shared;
33 using std::shared_ptr;
36 UpmixerB::UpmixerB (int sampling_rate)
37 : _lfe (0.01, 150.0 / sampling_rate)
38 , _delay (0.02 * sampling_rate)
45 UpmixerB::name () const
47 return _("Stereo to 5.1 up-mixer B");
54 return N_("stereo-5.1-upmix-b");
59 UpmixerB::out_channels () const
65 shared_ptr<AudioProcessor>
66 UpmixerB::clone (int sampling_rate) const
68 return make_shared<UpmixerB>(sampling_rate);
72 shared_ptr<AudioBuffers>
73 UpmixerB::run (shared_ptr<const AudioBuffers> in, int channels)
75 auto out = make_shared<AudioBuffers>(channels, in->frames());
77 /* L + R minus 6dB (in terms of amplitude) */
78 auto in_LR = in->channel(0);
79 in_LR->accumulate_frames (in->channel(1).get(), in->frames(), 0, 0);
80 in_LR->apply_gain (-6);
84 out->copy_channel_from (in.get(), 0, 0);
89 out->copy_channel_from (in.get(), 1, 1);
93 /* C = L + R minus 3dB */
94 out->copy_channel_from (in_LR.get(), 0, 2);
98 /* Lfe is filtered C */
99 out->copy_channel_from (_lfe.run(in_LR).get(), 0, 3);
102 shared_ptr<AudioBuffers> S;
104 /* Ls is L - R with some delay */
105 auto sub = make_shared<AudioBuffers>(1, in->frames());
106 sub->copy_channel_from (in.get(), 0, 0);
107 float* p = sub->data (0);
108 float const * q = in->data (1);
109 for (int i = 0; i < in->frames(); ++i) {
112 S = _delay.run (sub);
113 out->copy_channel_from (S.get(), 0, 4);
118 out->copy_channel_from (S.get(), 0, 5);
134 UpmixerB::make_audio_mapping_default (AudioMapping& mapping) const
136 /* Just map the first two input channels to our L/R */
137 mapping.make_zero ();
138 for (int i = 0; i < min (2, mapping.input_channels()); ++i) {
139 mapping.set (i, i, 1);
145 UpmixerB::input_names () const
148 NamedChannel(_("Upmix L"), 0),
149 NamedChannel(_("Upmix R"), 1)