57 lines
2.2 KiB
C
57 lines
2.2 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* Copyright (C) 2008 Max Kellermann <max@duempel.org>
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef MPD_CROSSFADE_H
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#define MPD_CROSSFADE_H
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struct audio_format;
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struct music_chunk;
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/**
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* Calculate how many music pipe chunks should be used for crossfading.
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*
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* @param duration the requested crossfade duration
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* @param total_time total_time the duration of the new song
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* @param af the audio format of the new song
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* @param old_format the audio format of the current song
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* @param max_chunks the maximum number of chunks
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* @return the number of chunks for crossfading, or 0 if cross fading
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* should be disabled for this song change
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*/
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unsigned cross_fade_calc(float duration, float total_time,
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const struct audio_format *af,
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const struct audio_format *old_format,
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unsigned max_chunks);
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/*
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* Applies cross fading to two chunks, i.e. mixes these chunks.
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* Internally, this calls pcm_mix().
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*
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* @param a the chunk in the current song (and the destination chunk)
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* @param b the according chunk in the new song
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* @param format the audio format of both chunks (must be the same)
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* @param current_chunk the relative index of the current chunk
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* @param num_chunks the number of chunks used for cross fading
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*/
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void cross_fade_apply(struct music_chunk *a, const struct music_chunk *b,
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const struct audio_format *format,
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unsigned int current_chunk, unsigned int num_chunks);
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#endif
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