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Let I_FadeSong be used in the middle of an existing fade

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- Doing this so two fades can be installed at the end of
  the credits; 1 for normal playback speed, 2 for skip
  behavior
- I_FadeSong can now be used to speed up or slow down an
  existing fade
- Previously, calling I_FadeSong this way would jump to
  the previous target volume first, before starting a new
  fade
- Should make no regressions
This commit is contained in:
James R 2024-03-24 19:05:23 -07:00
parent df0e256c00
commit 4fe992b19d
1 changed files with 9 additions and 5 deletions
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14
src/audio/music_player.cpp
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@ -63,10 +63,7 @@ public:
// the fade gain, even if it would clamp anyway.
for (std::size_t i = 0; i < generated; i++)
{
const float alpha = 1.0 - (gain_samples_target_ - std::min(gain_samples_ + i, gain_samples_target_)) /
static_cast<double>(gain_samples_target_);
const float fade_gain = (gain_target_ - gain_) * std::clamp(alpha, 0.f, 1.f) + gain_;
buffer[total_written + i] *= fade_gain;
buffer[total_written + i] *= current_fade_gain(i);
}
gain_samples_ = std::min(gain_samples_ + generated, gain_samples_target_);
@ -255,7 +252,7 @@ public:
return std::nullopt;
}
void fade_to(float gain, float seconds) { fade_from_to(gain_target_, gain, seconds); }
void fade_to(float gain, float seconds) { fade_from_to(current_fade_gain(0), gain, seconds); }
void fade_from_to(float from, float to, float seconds)
{
@ -300,6 +297,13 @@ private:
bool fading_ {false};
uint64_t gain_samples_ {0};
uint64_t gain_samples_target_ {1};
float current_fade_gain(uint64_t i) const
{
const float alpha = 1.0 - (gain_samples_target_ - std::min(gain_samples_ + i, gain_samples_target_)) /
static_cast<double>(gain_samples_target_);
return (gain_target_ - gain_) * std::clamp(alpha, 0.f, 1.f) + gain_;
}
};
// The special member functions MUST be declared in this unit, where Impl is complete.