2 Copyright (C) 2013-2015 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 "audio_mapping.h"
22 #include "md5_digester.h"
23 #include <libcxml/cxml.h>
24 #include <dcp/raw_convert.h>
25 #include <libxml++/libxml++.h>
34 using boost::shared_ptr;
35 using boost::dynamic_pointer_cast;
36 using dcp::raw_convert;
38 AudioMapping::AudioMapping ()
39 : _content_channels (0)
44 /** Create an empty AudioMapping for a given channel count.
45 * @param channels Number of channels.
47 AudioMapping::AudioMapping (int channels)
53 AudioMapping::setup (int c)
55 _content_channels = c;
57 _gain.resize (_content_channels);
58 for (int i = 0; i < _content_channels; ++i) {
59 _gain[i].resize (MAX_DCP_AUDIO_CHANNELS);
64 AudioMapping::make_default ()
66 for (int i = 0; i < _content_channels; ++i) {
67 for (int j = 0; j < MAX_DCP_AUDIO_CHANNELS; ++j) {
72 if (_content_channels == 1) {
74 set (0, dcp::CENTRE, 1);
77 for (int i = 0; i < min (_content_channels, MAX_DCP_AUDIO_CHANNELS); ++i) {
78 set (i, static_cast<dcp::Channel> (i), 1);
83 AudioMapping::AudioMapping (cxml::ConstNodePtr node, int state_version)
85 setup (node->number_child<int> ("ContentChannels"));
87 if (state_version <= 5) {
88 /* Old-style: on/off mapping */
89 list<cxml::NodePtr> const c = node->node_children ("Map");
90 for (list<cxml::NodePtr>::const_iterator i = c.begin(); i != c.end(); ++i) {
91 set ((*i)->number_child<int> ("ContentIndex"), static_cast<dcp::Channel> ((*i)->number_child<int> ("DCP")), 1);
94 list<cxml::NodePtr> const c = node->node_children ("Gain");
95 for (list<cxml::NodePtr>::const_iterator i = c.begin(); i != c.end(); ++i) {
97 (*i)->number_attribute<int> ("Content"),
98 static_cast<dcp::Channel> ((*i)->number_attribute<int> ("DCP")),
99 raw_convert<float> ((*i)->content ())
106 AudioMapping::set (int c, dcp::Channel d, float g)
112 AudioMapping::get (int c, dcp::Channel d) const
118 AudioMapping::as_xml (xmlpp::Node* node) const
120 node->add_child ("ContentChannels")->add_child_text (raw_convert<string> (_content_channels));
122 for (int c = 0; c < _content_channels; ++c) {
123 for (int d = 0; d < MAX_DCP_AUDIO_CHANNELS; ++d) {
124 xmlpp::Element* t = node->add_child ("Gain");
125 t->set_attribute ("Content", raw_convert<string> (c));
126 t->set_attribute ("DCP", raw_convert<string> (d));
127 t->add_child_text (raw_convert<string> (get (c, static_cast<dcp::Channel> (d))));
132 /** @return a string which is unique for a given AudioMapping configuration, for
133 * differentiation between different AudioMappings.
136 AudioMapping::digest () const
138 MD5Digester digester;
139 digester.add (_content_channels);
140 for (int i = 0; i < _content_channels; ++i) {
141 for (int j = 0; j < MAX_DCP_AUDIO_CHANNELS; ++j) {
142 digester.add (_gain[i][j]);
146 return digester.get ();
150 AudioMapping::mapped_dcp_channels () const
152 static float const minus_96_db = 0.000015849;
154 list<dcp::Channel> mapped;
156 for (vector<vector<float> >::const_iterator i = _gain.begin(); i != _gain.end(); ++i) {
157 for (size_t j = 0; j < i->size(); ++j) {
158 if (abs ((*i)[j]) > minus_96_db) {
159 mapped.push_back ((dcp::Channel) j);
171 AudioMapping::unmap_all ()
173 for (vector<vector<float> >::iterator i = _gain.begin(); i != _gain.end(); ++i) {
174 for (vector<float>::iterator j = i->begin(); j != i->end(); ++j) {