src/lib/audio_mapping.cc

   1 /*
   2     Copyright (C) 2013-2021 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
  22 #include "audio_mapping.h"
  23 #include "audio_processor.h"
  24 #include "constants.h"
  25 #include "dcpomatic_assert.h"
  26 #include "digester.h"
  27 #include <dcp/raw_convert.h>
  28 #include <dcp/warnings.h>
  29 #include <libcxml/cxml.h>
  30 LIBDCP_DISABLE_WARNINGS
  31 #include <libxml++/libxml++.h>
  32 LIBDCP_ENABLE_WARNINGS
  33 #include <boost/regex.hpp>
  34 #include <iostream>
  35
  36
  37 using std::list;
  38 using std::cout;
  39 using std::make_pair;
  40 using std::pair;
  41 using std::string;
  42 using std::min;
  43 using std::vector;
  44 using std::abs;
  45 using std::shared_ptr;
  46 using std::dynamic_pointer_cast;
  47 using boost::optional;
  48 using dcp::raw_convert;
  49
  50
  51 /** Create an empty AudioMapping.
  52  *  @param input_channels Number of input channels.
  53  *  @param output_channels Number of output channels.
  54  */
  55 AudioMapping::AudioMapping (int input_channels, int output_channels)
  56 {
  57         setup (input_channels, output_channels);
  58 }
  59
  60
  61 void
  62 AudioMapping::setup (int input_channels, int output_channels)
  63 {
  64         _gain.resize(input_channels);
  65         for (int i = 0; i < input_channels; ++i) {
  66                 _gain[i].resize(output_channels);
  67         }
  68
  69         make_zero ();
  70 }
  71
  72
  73 void
  74 AudioMapping::make_zero ()
  75 {
  76         for (auto& input: _gain) {
  77                 for (auto& output: input) {
  78                         output = 0;
  79                 }
  80         }
  81 }
  82
  83
  84 struct ChannelRegex
  85 {
  86         ChannelRegex (string regex_, int channel_)
  87                 : regex (regex_)
  88                 , channel (channel_)
  89         {}
  90
  91         string regex;
  92         int channel;
  93 };
  94
  95
  96 void
  97 AudioMapping::make_default (AudioProcessor const * processor, optional<boost::filesystem::path> filename)
  98 {
  99         static ChannelRegex const regex[] = {
 100                 ChannelRegex(".*[\\._-]L[\\._-].*", 0),
 101                 ChannelRegex(".*[\\._-]R[\\._-].*", 1),
 102                 ChannelRegex(".*[\\._-]C[\\._-].*", 2),
 103                 ChannelRegex(".*[\\._-]Lfe[\\._-].*", 3),
 104                 ChannelRegex(".*[\\._-]LFE[\\._-].*", 3),
 105                 ChannelRegex(".*[\\._-]Lss[\\._-].*", 4),
 106                 ChannelRegex(".*[\\._-]Lsr[\\._-].*", 6),
 107                 ChannelRegex(".*[\\._-]Lrs[\\._-].*", 6),
 108                 ChannelRegex(".*[\\._-]Ls[\\._-].*", 4),
 109                 ChannelRegex(".*[\\._-]Rss[\\._-].*", 5),
 110                 ChannelRegex(".*[\\._-]Rsr[\\._-].*", 7),
 111                 ChannelRegex(".*[\\._-]Rrs[\\._-].*", 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->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::Channel::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
 149 AudioMapping::AudioMapping (cxml::ConstNodePtr node, int state_version)
 150 {
 151         if (state_version < 32) {
 152                 setup (node->number_child<int>("ContentChannels"), MAX_DCP_AUDIO_CHANNELS);
 153         } else {
 154                 setup (node->number_child<int>("InputChannels"), node->number_child<int>("OutputChannels"));
 155         }
 156
 157         if (state_version <= 5) {
 158                 /* Old-style: on/off mapping */
 159                 for (auto i: node->node_children ("Map")) {
 160                         set (i->number_child<int>("ContentIndex"), i->number_child<int>("DCP"), 1);
 161                 }
 162         } else {
 163                 for (auto i: node->node_children("Gain")) {
 164                         if (state_version < 32) {
 165                                 set (
 166                                         i->number_attribute<int>("Content"),
 167                                         i->number_attribute<int>("DCP"),
 168                                         raw_convert<float>(i->content())
 169                                         );
 170                         } else {
 171                                 set (
 172                                         i->number_attribute<int>("Input"),
 173                                         i->number_attribute<int>("Output"),
 174                                         raw_convert<float>(i->content())
 175                                         );
 176                         }
 177                 }
 178         }
 179 }
 180
 181
 182 void
 183 AudioMapping::set (dcp::Channel input_channel, int output_channel, float g)
 184 {
 185         set (static_cast<int>(input_channel), output_channel, g);
 186 }
 187
 188
 189 void
 190 AudioMapping::set (int input_channel, dcp::Channel output_channel, float g)
 191 {
 192         set (input_channel, static_cast<int>(output_channel), g);
 193 }
 194
 195
 196 void
 197 AudioMapping::set (int input_channel, int output_channel, float g)
 198 {
 199         DCPOMATIC_ASSERT (input_channel < int(_gain.size()));
 200         DCPOMATIC_ASSERT (output_channel < int(_gain[0].size()));
 201         _gain[input_channel][output_channel] = g;
 202 }
 203
 204
 205 float
 206 AudioMapping::get (int input_channel, dcp::Channel output_channel) const
 207 {
 208         return get (input_channel, static_cast<int>(output_channel));
 209 }
 210
 211
 212 float
 213 AudioMapping::get (int input_channel, int output_channel) const
 214 {
 215         DCPOMATIC_ASSERT (input_channel < int (_gain.size()));
 216         DCPOMATIC_ASSERT (output_channel < int (_gain[0].size()));
 217         return _gain[input_channel][output_channel];
 218 }
 219
 220
 221 void
 222 AudioMapping::as_xml (xmlpp::Node* node) const
 223 {
 224         auto const input = input_channels();
 225         auto const output = output_channels();
 226
 227         node->add_child("InputChannels")->add_child_text(raw_convert<string>(input));
 228         node->add_child("OutputChannels")->add_child_text(raw_convert<string>(output));
 229
 230         for (int c = 0; c < input; ++c) {
 231                 for (int d = 0; d < output; ++d) {
 232                         auto t = node->add_child ("Gain");
 233                         t->set_attribute ("Input", raw_convert<string> (c));
 234                         t->set_attribute ("Output", raw_convert<string> (d));
 235                         t->add_child_text (raw_convert<string> (get (c, d)));
 236                 }
 237         }
 238 }
 239
 240
 241 /** @return a string which is unique for a given AudioMapping configuration, for
 242  *  differentiation between different AudioMappings.
 243  */
 244 string
 245 AudioMapping::digest () const
 246 {
 247         Digester digester;
 248         digester.add(input_channels());
 249         digester.add(output_channels());
 250         for (auto const& input: _gain) {
 251                 for (auto output: input) {
 252                         digester.add(output);
 253                 }
 254         }
 255
 256         return digester.get ();
 257 }
 258
 259
 260 list<int>
 261 AudioMapping::mapped_output_channels () const
 262 {
 263         static float const minus_96_db = 0.000015849;
 264
 265         list<int> mapped;
 266
 267         for (auto const& i: _gain) {
 268                 for (auto j: dcp::used_audio_channels()) {
 269                         if (abs(i[static_cast<int>(j)]) > minus_96_db) {
 270                                 mapped.push_back (static_cast<int>(j));
 271                         }
 272                 }
 273         }
 274
 275         mapped.sort ();
 276         mapped.unique ();
 277
 278         return mapped;
 279 }
 280
 281
 282 void
 283 AudioMapping::unmap_all ()
 284 {
 285         for (auto& i: _gain) {
 286                 for (auto& j: i) {
 287                         j = 0;
 288                 }
 289         }
 290 }