37a3d5fa22b8d8dc03b684e08a4f7842b747391f
[dcpomatic.git] / src / lib / audio_mapping.cc
1 /*
2     Copyright (C) 2013-2018 Carl Hetherington <cth@carlh.net>
3
4     This file is part of DCP-o-matic.
5
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.
10
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.
15
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/>.
18
19 */
20
21 #include "audio_mapping.h"
22 #include "audio_processor.h"
23 #include "digester.h"
24 #include "util.h"
25 #include "warnings.h"
26 #include <dcp/raw_convert.h>
27 #include <libcxml/cxml.h>
28 DCPOMATIC_DISABLE_WARNINGS
29 #include <libxml++/libxml++.h>
30 DCPOMATIC_ENABLE_WARNINGS
31 #include <boost/regex.hpp>
32 #include <iostream>
33
34 using std::list;
35 using std::cout;
36 using std::make_pair;
37 using std::pair;
38 using std::string;
39 using std::min;
40 using std::vector;
41 using std::abs;
42 using std::shared_ptr;
43 using std::dynamic_pointer_cast;
44 using boost::optional;
45 using dcp::raw_convert;
46
47 AudioMapping::AudioMapping ()
48         : _input_channels (0)
49         , _output_channels (0)
50 {
51
52 }
53
54 /** Create an empty AudioMapping.
55  *  @param input_channels Number of input channels.
56  *  @param output_channels Number of output channels.
57  */
58 AudioMapping::AudioMapping (int input_channels, int output_channels)
59 {
60         setup (input_channels, output_channels);
61 }
62
63 void
64 AudioMapping::setup (int input_channels, int output_channels)
65 {
66         _input_channels = input_channels;
67         _output_channels = output_channels;
68
69         _gain.resize (_input_channels);
70         for (int i = 0; i < _input_channels; ++i) {
71                 _gain[i].resize (_output_channels);
72         }
73
74         make_zero ();
75 }
76
77 void
78 AudioMapping::make_zero ()
79 {
80         for (int i = 0; i < _input_channels; ++i) {
81                 for (int j = 0; j < _output_channels; ++j) {
82                         _gain[i][j] = 0;
83                 }
84         }
85 }
86
87 struct ChannelRegex
88 {
89         ChannelRegex (string regex_, int channel_)
90                 : regex (regex_)
91                 , channel (channel_)
92         {}
93
94         string regex;
95         int channel;
96 };
97
98 void
99 AudioMapping::make_default (AudioProcessor const * processor, optional<boost::filesystem::path> filename)
100 {
101         static ChannelRegex const regex[] = {
102                 ChannelRegex(".*[\\._-]L[\\._-].*", 0),
103                 ChannelRegex(".*[\\._-]R[\\._-].*", 1),
104                 ChannelRegex(".*[\\._-]C[\\._-].*", 2),
105                 ChannelRegex(".*[\\._-]Lfe[\\._-].*", 3),
106                 ChannelRegex(".*[\\._-]LFE[\\._-].*", 3),
107                 ChannelRegex(".*[\\._-]Lss[\\._-].*", 4),
108                 ChannelRegex(".*[\\._-]Lsr[\\._-].*", 6),
109                 ChannelRegex(".*[\\._-]Ls[\\._-].*", 4),
110                 ChannelRegex(".*[\\._-]Rss[\\._-].*", 5),
111                 ChannelRegex(".*[\\._-]Rsr[\\._-].*", 7),
112                 ChannelRegex(".*[\\._-]Rs[\\._-].*", 5),
113         };
114
115         static int const regexes = sizeof(regex) / sizeof(*regex);
116
117         if (processor) {
118                 processor->make_audio_mapping_default (*this);
119         } else {
120                 make_zero ();
121                 if (input_channels() == 1) {
122                         bool guessed = false;
123
124                         /* See if we can guess where this stream should go */
125                         if (filename) {
126                                 for (int i = 0; i < regexes; ++i) {
127                                         boost::regex e (regex[i].regex, boost::regex::icase);
128                                         if (boost::regex_match(filename->string(), e) && regex[i].channel < output_channels()) {
129                                                 set (0, regex[i].channel, 1);
130                                                 guessed = true;
131                                         }
132                                 }
133                         }
134
135                         if (!guessed) {
136                                 /* If we have no idea, just put it on centre */
137                                 set (0, static_cast<int>(dcp::CENTRE), 1);
138                         }
139                 } else {
140                         /* 1:1 mapping */
141                         for (int i = 0; i < min (input_channels(), output_channels()); ++i) {
142                                 set (i, i, 1);
143                         }
144                 }
145         }
146 }
147
148 AudioMapping::AudioMapping (cxml::ConstNodePtr node, int state_version)
149 {
150         if (state_version < 32) {
151                 setup (node->number_child<int> ("ContentChannels"), MAX_DCP_AUDIO_CHANNELS);
152         } else {
153                 setup (node->number_child<int> ("InputChannels"), node->number_child<int> ("OutputChannels"));
154         }
155
156         if (state_version <= 5) {
157                 /* Old-style: on/off mapping */
158                 list<cxml::NodePtr> const c = node->node_children ("Map");
159                 for (list<cxml::NodePtr>::const_iterator i = c.begin(); i != c.end(); ++i) {
160                         set ((*i)->number_child<int> ("ContentIndex"), static_cast<dcp::Channel> ((*i)->number_child<int> ("DCP")), 1);
161                 }
162         } else {
163                 list<cxml::NodePtr> const c = node->node_children ("Gain");
164                 for (list<cxml::NodePtr>::const_iterator i = c.begin(); i != c.end(); ++i) {
165                         if (state_version < 32) {
166                                 set (
167                                         (*i)->number_attribute<int> ("Content"),
168                                         static_cast<dcp::Channel> ((*i)->number_attribute<int> ("DCP")),
169                                         raw_convert<float> ((*i)->content ())
170                                         );
171                         } else {
172                                 set (
173                                         (*i)->number_attribute<int> ("Input"),
174                                         (*i)->number_attribute<int> ("Output"),
175                                         raw_convert<float> ((*i)->content ())
176                                         );
177                         }
178                 }
179         }
180 }
181
182 void
183 AudioMapping::set (int input_channel, int output_channel, float g)
184 {
185         DCPOMATIC_ASSERT (input_channel < int(_gain.size()));
186         DCPOMATIC_ASSERT (output_channel < int(_gain[0].size()));
187         _gain[input_channel][output_channel] = g;
188 }
189
190 float
191 AudioMapping::get (int input_channel, int output_channel) const
192 {
193         DCPOMATIC_ASSERT (input_channel < int (_gain.size()));
194         DCPOMATIC_ASSERT (output_channel < int (_gain[0].size()));
195         return _gain[input_channel][output_channel];
196 }
197
198 void
199 AudioMapping::as_xml (xmlpp::Node* node) const
200 {
201         node->add_child ("InputChannels")->add_child_text (raw_convert<string> (_input_channels));
202         node->add_child ("OutputChannels")->add_child_text (raw_convert<string> (_output_channels));
203
204         for (int c = 0; c < _input_channels; ++c) {
205                 for (int d = 0; d < _output_channels; ++d) {
206                         xmlpp::Element* t = node->add_child ("Gain");
207                         t->set_attribute ("Input", raw_convert<string> (c));
208                         t->set_attribute ("Output", raw_convert<string> (d));
209                         t->add_child_text (raw_convert<string> (get (c, d)));
210                 }
211         }
212 }
213
214 /** @return a string which is unique for a given AudioMapping configuration, for
215  *  differentiation between different AudioMappings.
216  */
217 string
218 AudioMapping::digest () const
219 {
220         Digester digester;
221         digester.add (_input_channels);
222         digester.add (_output_channels);
223         for (int i = 0; i < _input_channels; ++i) {
224                 for (int j = 0; j < _output_channels; ++j) {
225                         digester.add (_gain[i][j]);
226                 }
227         }
228
229         return digester.get ();
230 }
231
232 list<int>
233 AudioMapping::mapped_output_channels () const
234 {
235         static float const minus_96_db = 0.000015849;
236
237         list<int> mapped;
238
239         for (vector<vector<float> >::const_iterator i = _gain.begin(); i != _gain.end(); ++i) {
240                 BOOST_FOREACH (dcp::Channel j, dcp::used_audio_channels()) {
241                         if (abs ((*i)[j]) > minus_96_db) {
242                                 mapped.push_back (j);
243                         }
244                 }
245         }
246
247         mapped.sort ();
248         mapped.unique ();
249
250         return mapped;
251 }
252
253 void
254 AudioMapping::unmap_all ()
255 {
256         for (vector<vector<float> >::iterator i = _gain.begin(); i != _gain.end(); ++i) {
257                 for (vector<float>::iterator j = i->begin(); j != i->end(); ++j) {
258                         *j = 0;
259                 }
260         }
261 }