8ad17d25ef
From the feature request: "I generally like to have crossfade on, but when it happens during such short tracks (e.g. 20 seconds or less) it doesn't really sound good as those tracks are not really meant to be crossfaded and intended to act as a bridge on their own." Sounds reasonable. This commit doesn't add an option, but hard-codes the limit to 20 seconds. If it turns out that users want to have it configurable, we can still add the option. Closes https://github.com/MusicPlayerDaemon/MPD/issues/1184
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* 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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_CROSSFADE_HXX
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#define MPD_CROSSFADE_HXX
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#include "Chrono.hxx"
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struct AudioFormat;
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class SignedSongTime;
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struct CrossFadeSettings {
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/**
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* Songs shorter than this will never cross-fade.
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*/
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static constexpr SignedSongTime MIN_TOTAL_TIME{std::chrono::seconds{20}};
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/**
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* The configured cross fade duration [s].
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*/
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FloatDuration duration{0};
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float mixramp_db{0};
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/**
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* The configured MixRapm delay [s]. A non-positive value
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* disables MixRamp.
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*/
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FloatDuration mixramp_delay{-1};
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constexpr bool IsEnabled() const noexcept {
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return duration.count() > 0;
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}
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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 current_total_time the duration of the current song
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* @param next_total_time the duration of the new song
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* @param replay_gain_db the ReplayGain adjustment used for this song
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* @param replay_gain_prev_db the ReplayGain adjustment used on the last song
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* @param mixramp_start the next songs mixramp_start tag
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* @param mixramp_prev_end the last songs mixramp_end setting
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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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[[gnu::pure]]
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unsigned Calculate(SignedSongTime current_total_time,
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SignedSongTime next_total_time,
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float replay_gain_db, float replay_gain_prev_db,
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const char *mixramp_start,
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const char *mixramp_prev_end,
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AudioFormat af, AudioFormat old_format,
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unsigned max_chunks) const noexcept;
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private:
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/**
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* Can the described song be cross-faded?
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*/
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[[gnu::pure]]
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bool CanCrossFadeSong(SignedSongTime total_time) const noexcept;
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};
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#endif
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