2 Copyright (C) 2015 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/>.
21 #include "upmixer_b.h"
22 #include "audio_buffers.h"
23 #include "audio_mapping.h"
24 #include <boost/make_shared.hpp>
31 using boost::shared_ptr;
32 using boost::make_shared;
34 UpmixerB::UpmixerB (int sampling_rate)
35 : _lfe (0.01, 150.0 / sampling_rate)
36 , _delay (0.02 * sampling_rate)
42 UpmixerB::name () const
44 return _("Stereo to 5.1 up-mixer B");
51 return N_("stereo-5.1-upmix-b");
55 UpmixerB::out_channels () const
60 shared_ptr<AudioProcessor>
61 UpmixerB::clone (int sampling_rate) const
63 return make_shared<UpmixerB> (sampling_rate);
66 shared_ptr<AudioBuffers>
67 UpmixerB::run (shared_ptr<const AudioBuffers> in, int channels)
69 shared_ptr<AudioBuffers> out = make_shared<AudioBuffers> (channels, in->frames());
71 /* L + R minus 6dB (in terms of amplitude) */
72 shared_ptr<AudioBuffers> in_LR = in->channel(0);
73 in_LR->accumulate_frames (in->channel(1).get(), 0, 0, in->frames());
74 in_LR->apply_gain (-6);
78 out->copy_channel_from (in.get(), 0, 0);
83 out->copy_channel_from (in.get(), 1, 1);
87 /* C = L + R minus 3dB */
88 out->copy_channel_from (in_LR.get(), 0, 2);
92 /* Lfe is filtered C */
93 out->copy_channel_from (_lfe.run(in_LR).get(), 0, 3);
96 shared_ptr<AudioBuffers> S;
98 /* Ls is L - R with some delay */
99 shared_ptr<AudioBuffers> sub = make_shared<AudioBuffers> (1, in->frames());
100 sub->copy_channel_from (in.get(), 0, 0);
101 float* p = sub->data (0);
102 float const * q = in->data (1);
103 for (int i = 0; i < in->frames(); ++i) {
106 S = _delay.run (sub);
107 out->copy_channel_from (S.get(), 0, 4);
112 out->copy_channel_from (S.get(), 0, 5);
126 UpmixerB::make_audio_mapping_default (AudioMapping& mapping) const
128 /* Just map the first two input channels to our L/R */
129 mapping.make_zero ();
130 for (int i = 0; i < min (2, mapping.input_channels()); ++i) {
131 mapping.set (i, i, 1);
136 UpmixerB::input_names () const
139 n.push_back (_("Upmix L"));
140 n.push_back (_("Upmix R"));