/*
    Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>

    This file is part of DCP-o-matic.

    DCP-o-matic 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.

    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.

*/


/** @file src/sound_processor.cc
 *  @brief CinemaSoundProcessor class.
 */


#include "cinema_sound_processor.h"
#include "dolby_cp750.h"
#include "usl.h"
#include "datasat_ap2x.h"
#include "dcpomatic_assert.h"
#include <iostream>
#include <cassert>


using namespace std;


vector<unique_ptr<const CinemaSoundProcessor>> CinemaSoundProcessor::_cinema_sound_processors;


/** @param i Our id.
 *  @param n User-visible name.
 */
CinemaSoundProcessor::CinemaSoundProcessor (string i, string n, float knee, float below, float above)
	: _id (i)
	, _name (n)
	, _knee (knee)
	, _below (below)
	, _above (above)
{

}


/** @return All available sound processors */
vector<CinemaSoundProcessor const *>
CinemaSoundProcessor::all ()
{
	vector<CinemaSoundProcessor const *> raw;
	for (auto& processor: _cinema_sound_processors) {
		raw.push_back (processor.get());
	}
	return raw;
}


/** Set up the static _sound_processors vector; must be called before from_*
 *  methods are used.
 */
void
CinemaSoundProcessor::setup_cinema_sound_processors ()
{
	_cinema_sound_processors.push_back (unique_ptr<CinemaSoundProcessor>(new DolbyCP750));
	_cinema_sound_processors.push_back (unique_ptr<CinemaSoundProcessor>(new USL));
	_cinema_sound_processors.push_back (unique_ptr<CinemaSoundProcessor>(new DatasatAP2x));
}


/** @param id One of our ids.
 *  @return Corresponding sound processor, or 0.
 */
CinemaSoundProcessor const *
CinemaSoundProcessor::from_id (string id)
{
	auto i = _cinema_sound_processors.begin ();
	while (i != _cinema_sound_processors.end() && (*i)->id() != id) {
		++i;
	}

	if (i == _cinema_sound_processors.end ()) {
		return nullptr;
	}

	return i->get();
}


/** @param i An index returned from as_index().
 *  @return Corresponding sound processor.
 */
CinemaSoundProcessor const *
CinemaSoundProcessor::from_index (int i)
{
	DCPOMATIC_ASSERT (i >= 0 && i < int(_cinema_sound_processors.size()));
	return _cinema_sound_processors[i].get();
}


float
CinemaSoundProcessor::db_for_fader_change (float from, float to) const
{
	float db = 0;

	if (from < to) {
		if (from <= _knee) {
			float const t = min (to, _knee);
			db += (t - from) * _below;
		}

		if (to > 4) {
			float const t = max (from, _knee);
			db += (to - t) * _above;
		}
	} else {
		if (from >= _knee) {
			float const t = max (to, _knee);
			db -= (from - t) * _above;
		}

		if (to < _knee) {
			float const t = min (from, _knee);
			db -= (t - to) * _below;
		}
	}

	return db;
}