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/*
Copyright (C) 2009 Paul Davis
Author: Dave Robillard
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.
*/
#ifndef __ardour_chan_mapping_h__
#define __ardour_chan_mapping_h__
#include <map>
#include <cassert>
#include <ostream>
#include <utility>
#include "ardour/data_type.h"
namespace ARDOUR {
/** A mapping from one set of channels to another
* (e.g. how to 'connect' two BufferSets).
*/
class ChanMapping {
public:
ChanMapping() {}
ChanMapping(ChanCount identity) {
for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
for (size_t i = 0; i <= identity.get(*t); ++i)
set(*t, i, i);
}
}
uint32_t get(DataType t, uint32_t from) {
Mappings::iterator tm = _mappings.find(t);
assert(tm != _mappings.end());
TypeMapping::iterator m = tm->second.find(from);
assert(m != tm->second.end());
return m->second;
}
void set(DataType t, uint32_t from, uint32_t to) {
Mappings::iterator tm = _mappings.find(t);
if (tm == _mappings.end()) {
tm = _mappings.insert(std::make_pair(t, TypeMapping())).first;
}
tm->second.insert(std::make_pair(from, to));
}
/** Increase the 'to' field of every mapping for type @a t by @a delta */
void offset(DataType t, uint32_t delta) {
Mappings::iterator tm = _mappings.find(t);
if (tm != _mappings.end()) {
for (TypeMapping::iterator m = tm->second.begin(); m != tm->second.end(); ++m) {
m->second += delta;
}
}
}
private:
typedef std::map<uint32_t, uint32_t> TypeMapping;
typedef std::map<DataType, TypeMapping> Mappings;
Mappings _mappings;
};
} // namespace ARDOUR
#endif // __ardour_chan_mapping_h__
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