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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_CROSSFADE_HXX
#define MPD_CROSSFADE_HXX
#include "Compiler.h"
#include <cmath>
struct AudioFormat;
struct CrossFadeSettings {
/**
* The configured cross fade duration [s].
*/
float duration;
float mixramp_db;
/**
* The configured MixRapm delay [s].
*/
float mixramp_delay;
CrossFadeSettings()
:duration(0),
mixramp_db(0),
mixramp_delay(std::nanf(""))
{}
/**
* Calculate how many music pipe chunks should be used for crossfading.
*
* @param duration the requested crossfade duration
* @param total_time total_time the duration of the new song
* @param mixramp_db the current mixramp_db setting
* @param mixramp_delay the current mixramp_delay setting
* @param replay_gain_db the ReplayGain adjustment used for this song
* @param replay_gain_prev_db the ReplayGain adjustment used on the last song
* @param mixramp_start the next songs mixramp_start tag
* @param mixramp_prev_end the last songs mixramp_end setting
* @param af the audio format of the new song
* @param old_format the audio format of the current song
* @param max_chunks the maximum number of chunks
* @return the number of chunks for crossfading, or 0 if cross fading
* should be disabled for this song change
*/
gcc_pure
unsigned Calculate(float total_time,
float replay_gain_db, float replay_gain_prev_db,
const char *mixramp_start,
const char *mixramp_prev_end,
AudioFormat af, AudioFormat old_format,
unsigned max_chunks) const;
};
#endif
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