2 Copyright (C) 2013 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 <libxml++/libxml++.h>
21 #include <libcxml/cxml.h>
22 #include <libdcp/raw_convert.h>
23 #include "audio_mapping.h"
25 #include "md5_digester.h"
33 using boost::shared_ptr;
34 using boost::dynamic_pointer_cast;
35 using libdcp::raw_convert;
37 AudioMapping::AudioMapping ()
38 : _content_channels (0)
43 /** Create a default AudioMapping for a given channel count.
44 * @param c Number of channels.
46 AudioMapping::AudioMapping (int c)
52 AudioMapping::setup (int c)
54 _content_channels = c;
56 _gain.resize (_content_channels);
57 for (int i = 0; i < _content_channels; ++i) {
58 _gain[i].resize (MAX_DCP_AUDIO_CHANNELS);
63 AudioMapping::make_default ()
65 for (int i = 0; i < _content_channels; ++i) {
66 for (int j = 0; j < MAX_DCP_AUDIO_CHANNELS; ++j) {
71 if (_content_channels == 1) {
73 set (0, libdcp::CENTRE, 1);
76 for (int i = 0; i < min (_content_channels, MAX_DCP_AUDIO_CHANNELS); ++i) {
77 set (i, static_cast<libdcp::Channel> (i), 1);
82 AudioMapping::AudioMapping (shared_ptr<const cxml::Node> node, int state_version)
84 setup (node->number_child<int> ("ContentChannels"));
86 if (state_version <= 5) {
87 /* Old-style: on/off mapping */
88 list<cxml::NodePtr> const c = node->node_children ("Map");
89 for (list<cxml::NodePtr>::const_iterator i = c.begin(); i != c.end(); ++i) {
90 set ((*i)->number_child<int> ("ContentIndex"), static_cast<libdcp::Channel> ((*i)->number_child<int> ("DCP")), 1);
93 list<cxml::NodePtr> const c = node->node_children ("Gain");
94 for (list<cxml::NodePtr>::const_iterator i = c.begin(); i != c.end(); ++i) {
96 (*i)->number_attribute<int> ("Content"),
97 static_cast<libdcp::Channel> ((*i)->number_attribute<int> ("DCP")),
98 raw_convert<float> ((*i)->content ())
105 AudioMapping::set (int c, libdcp::Channel d, float g)
111 AudioMapping::get (int c, libdcp::Channel d) const
117 AudioMapping::as_xml (xmlpp::Node* node) const
119 node->add_child ("ContentChannels")->add_child_text (raw_convert<string> (_content_channels));
121 for (int c = 0; c < _content_channels; ++c) {
122 for (int d = 0; d < MAX_DCP_AUDIO_CHANNELS; ++d) {
123 xmlpp::Element* t = node->add_child ("Gain");
124 t->set_attribute ("Content", raw_convert<string> (c));
125 t->set_attribute ("DCP", raw_convert<string> (d));
126 t->add_child_text (raw_convert<string> (get (c, static_cast<libdcp::Channel> (d))));
131 /** @return a string which is unique for a given AudioMapping configuration, for
132 * differentiation between different AudioMappings.
135 AudioMapping::digest () const
137 MD5Digester digester;
138 digester.add (_content_channels);
139 for (int i = 0; i < _content_channels; ++i) {
140 for (int j = 0; j < MAX_DCP_AUDIO_CHANNELS; ++j) {
141 digester.add (_gain[i][j]);
145 return digester.get ();