2 Copyright (C) 2014-2015 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include "upmixer_a.h"
21 #include "audio_buffers.h"
22 #include "audio_mapping.h"
29 using boost::shared_ptr;
31 UpmixerA::UpmixerA (int sampling_rate)
32 : _left (0.02, 1900.0 / sampling_rate, 4800.0 / sampling_rate)
33 , _right (0.02, 1900.0 / sampling_rate, 4800.0 / sampling_rate)
34 , _centre (0.01, 150.0 / sampling_rate, 1900.0 / sampling_rate)
35 , _lfe (0.01, 150.0 / sampling_rate)
36 , _ls (0.02, 4800.0 / sampling_rate, 20000.0 / sampling_rate)
37 , _rs (0.02, 4800.0 / sampling_rate, 20000.0 / sampling_rate)
43 UpmixerA::name () const
45 return _("Stereo to 5.1 up-mixer A");
51 return N_("stereo-5.1-upmix-a");
55 UpmixerA::out_channels () const
60 shared_ptr<AudioProcessor>
61 UpmixerA::clone (int sampling_rate) const
63 return shared_ptr<AudioProcessor> (new UpmixerA (sampling_rate));
66 shared_ptr<AudioBuffers>
67 UpmixerA::run (shared_ptr<const AudioBuffers> in, int channels)
70 shared_ptr<AudioBuffers> in_L = in->channel (0);
71 shared_ptr<AudioBuffers> in_R = in->channel (1);
73 /* Mix of L and R; -6dB down in amplitude (3dB in terms of power) */
74 shared_ptr<AudioBuffers> in_LR = in_L->clone ();
75 in_LR->accumulate_frames (in_R.get(), 0, 0, in_R->frames ());
76 in_LR->apply_gain (-6);
79 vector<shared_ptr<AudioBuffers> > all_out;
80 all_out.push_back (_left.run (in_L));
81 all_out.push_back (_right.run (in_R));
82 all_out.push_back (_centre.run (in_LR));
83 all_out.push_back (_lfe.run (in_LR));
84 all_out.push_back (_ls.run (in_L));
85 all_out.push_back (_rs.run (in_R));
87 shared_ptr<AudioBuffers> out (new AudioBuffers (channels, in->frames ()));
88 int const N = min (channels, 6);
90 for (int i = 0; i < N; ++i) {
91 out->copy_channel_from (all_out[i].get(), 0, i);
94 for (int i = N; i < channels; ++i) {
113 UpmixerA::make_audio_mapping_default (AudioMapping& mapping) const
115 /* Just map the first two input channels to our L/R */
116 mapping.make_zero ();
117 for (int i = 0; i < min (2, mapping.input_channels()); ++i) {
118 mapping.set (i, i, 1);
123 UpmixerA::input_names () const
126 n.push_back (_("Upmix L"));
127 n.push_back (_("Upmix R"));