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"
30 using std::shared_ptr;
32 UpmixerB::UpmixerB (int sampling_rate)
33 : _lfe (0.01, 150.0 / sampling_rate)
34 , _delay (0.02 * sampling_rate)
40 UpmixerB::name () const
42 return _("Stereo to 5.1 up-mixer B");
49 return N_("stereo-5.1-upmix-b");
53 UpmixerB::out_channels () const
58 shared_ptr<AudioProcessor>
59 UpmixerB::clone (int sampling_rate) const
61 return shared_ptr<AudioProcessor> (new UpmixerB (sampling_rate));
64 shared_ptr<AudioBuffers>
65 UpmixerB::run (shared_ptr<const AudioBuffers> in, int channels)
67 shared_ptr<AudioBuffers> out (new AudioBuffers (channels, in->frames()));
69 /* L + R minus 6dB (in terms of amplitude) */
70 shared_ptr<AudioBuffers> in_LR = in->channel(0);
71 in_LR->accumulate_frames (in->channel(1).get(), in->frames(), 0, 0);
72 in_LR->apply_gain (-6);
76 out->copy_channel_from (in.get(), 0, 0);
81 out->copy_channel_from (in.get(), 1, 1);
85 /* C = L + R minus 3dB */
86 out->copy_channel_from (in_LR.get(), 0, 2);
90 /* Lfe is filtered C */
91 out->copy_channel_from (_lfe.run(in_LR).get(), 0, 3);
94 shared_ptr<AudioBuffers> S;
96 /* Ls is L - R with some delay */
97 shared_ptr<AudioBuffers> sub (new AudioBuffers (1, in->frames()));
98 sub->copy_channel_from (in.get(), 0, 0);
99 float* p = sub->data (0);
100 float const * q = in->data (1);
101 for (int i = 0; i < in->frames(); ++i) {
104 S = _delay.run (sub);
105 out->copy_channel_from (S.get(), 0, 4);
110 out->copy_channel_from (S.get(), 0, 5);
124 UpmixerB::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);
134 UpmixerB::input_names () const
136 vector<NamedChannel> n;
137 n.push_back (NamedChannel(_("Upmix L"), 0));
138 n.push_back (NamedChannel(_("Upmix R"), 1));