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/*
Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "audio_mapping.h"
using std::map;
using boost::optional;
AutomaticAudioMapping::AutomaticAudioMapping (int c)
: _source_channels (c)
{
}
optional<libdcp::Channel>
AutomaticAudioMapping::source_to_dcp (int c) const
{
if (c >= _source_channels) {
return optional<libdcp::Channel> ();
}
if (_source_channels == 1) {
/* mono sources to centre */
return libdcp::CENTRE;
}
return static_cast<libdcp::Channel> (c);
}
optional<int>
AutomaticAudioMapping::dcp_to_source (libdcp::Channel c) const
{
if (_source_channels == 1) {
if (c == libdcp::CENTRE) {
return 0;
} else {
return optional<int> ();
}
}
if (static_cast<int> (c) >= _source_channels) {
return optional<int> ();
}
return static_cast<int> (c);
}
int
AutomaticAudioMapping::dcp_channels () const
{
if (_source_channels == 1) {
/* The source is mono, so to put the mono channel into
the centre we need to generate a 5.1 soundtrack.
*/
return 6;
}
return _source_channels;
}
optional<int>
ConfiguredAudioMapping::dcp_to_source (libdcp::Channel c) const
{
map<int, libdcp::Channel>::const_iterator i = _source_to_dcp.begin ();
while (i != _source_to_dcp.end() && i->second != c) {
++i;
}
if (i == _source_to_dcp.end ()) {
return boost::none;
}
return i->first;
}
optional<libdcp::Channel>
ConfiguredAudioMapping::source_to_dcp (int c) const
{
map<int, libdcp::Channel>::const_iterator i = _source_to_dcp.find (c);
if (i == _source_to_dcp.end ()) {
return boost::none;
}
return i->second;
}
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