/*
    Copyright (C) 2009 Paul Davis
    Author: David 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"
#include "ardour/chan_count.h"

namespace ARDOUR {


/** A mapping from one set of channels to another
 * (e.g. how to 'connect' two BufferSets).
 */
class ChanMapping {
public:
	ChanMapping() {}
	ChanMapping(ARDOUR::ChanCount identity);

	uint32_t get(DataType t, uint32_t from, bool* valid);
	void     set(DataType t, uint32_t from, uint32_t to);
	void     offset_from(DataType t, int32_t delta);
	void     offset_to(DataType t, int32_t delta);

	typedef std::map<uint32_t, uint32_t>    TypeMapping;
	typedef std::map<DataType, TypeMapping> Mappings;

	Mappings       mappings()       { return _mappings; }
	const Mappings mappings() const { return _mappings; }

private:
	Mappings _mappings;
};

} // namespace ARDOUR

std::ostream& operator<<(std::ostream& o, const ARDOUR::ChanMapping& m);

#endif // __ardour_chan_mapping_h__