81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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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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constexpr bool IsMixRampEnabled() const noexcept {
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return mixramp_delay > FloatDuration::zero();
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}
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/**
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* Determine whether cross-fading the two songs is possible.
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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 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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* @return true if cross-fading is possible
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*/
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[[gnu::pure]]
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bool CanCrossFade(SignedSongTime current_total_time,
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SignedSongTime next_total_time,
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AudioFormat af, AudioFormat old_format) const noexcept;
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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 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 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(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,
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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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