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fade from 0dB to -100dB in 1.5 seconds

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This commit is contained in:
goeiecool9999 2024-12-09 18:04:00 +01:00
parent aec4462000
commit 307e166efb
1 changed files with 10 additions and 10 deletions
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20
src/Cafe/HW/Latte/Core/LatteShaderCache.cpp
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@ -176,7 +176,7 @@ class BootSoundPlayer
{
m_fadeOutRequested = false;
m_stopRequested = false;
m_volumeFactor = 1.0f;
m_fadeOutSample = 0;
m_bootSndPlayThread = std::thread{[this]() {
StreamBootSound();
}};
@ -188,15 +188,14 @@ class BootSoundPlayer
m_fadeOutRequested = true;
}
void ApplyFadeOutEffect(std::span<sint16> samples, float fadeStep)
void ApplyFadeOutEffect(std::span<sint16> samples, uint64 fadeOutDuration)
{
for(auto& i : samples)
{
i *= m_volumeFactor;
if(m_volumeFactor >= fadeStep)
m_volumeFactor -= fadeStep;
else
m_volumeFactor = 0;
float decibel = (float)m_fadeOutSample / fadeOutDuration * -100.0f;
float volumeFactor = pow(10,decibel/20);
i *= volumeFactor;
m_fadeOutSample++;
}
}
@ -206,6 +205,7 @@ class BootSoundPlayer
constexpr sint32 bitsPerSample = 16;
constexpr sint32 samplesPerBlock = sampleRate / 10; // block is 1/10th of a second
constexpr sint32 nChannels = 2;
constexpr uint64 fadeOutDuration = sampleRate * 3 / 2; // fadeout should last ~1.5 seconds
static_assert(bitsPerSample % 8 == 0, "bits per sample is not a multiple of 8");
AudioAPIPtr bootSndAudioDev;
@ -240,7 +240,7 @@ class BootSoundPlayer
constexpr sint32 audioBlockSize = samplesPerBlock * (bitsPerSample/8) * nChannels;
BootSoundReader bootSndFileReader(bootSndFileHandle, audioBlockSize);
while(m_volumeFactor > 0 && !m_stopRequested)
while(m_fadeOutSample < fadeOutDuration && !m_stopRequested)
{
while (bootSndAudioDev->NeedAdditionalBlocks())
{
@ -252,7 +252,7 @@ class BootSoundPlayer
break;
}
if(m_fadeOutRequested)
ApplyFadeOutEffect({data, samplesPerBlock * 2}, 1.0f / (sampleRate * 10.0f));
ApplyFadeOutEffect({data, samplesPerBlock * 2}, fadeOutDuration);
bootSndAudioDev->FeedBlock(data);
}
@ -268,7 +268,7 @@ class BootSoundPlayer
std::thread m_bootSndPlayThread;
std::atomic_bool m_fadeOutRequested = false;
std::atomic_bool m_stopRequested = false;
float m_volumeFactor = 1.0f;
uint64 m_fadeOutSample = 0;
};
static BootSoundPlayer g_bootSndPlayer;