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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_fadeOutRequested = false;
m_stopRequested = false; m_stopRequested = false;
m_volumeFactor = 1.0f; m_fadeOutSample = 0;
m_bootSndPlayThread = std::thread{[this]() { m_bootSndPlayThread = std::thread{[this]() {
StreamBootSound(); StreamBootSound();
}}; }};
@ -188,15 +188,14 @@ class BootSoundPlayer
m_fadeOutRequested = true; m_fadeOutRequested = true;
} }
void ApplyFadeOutEffect(std::span<sint16> samples, float fadeStep) void ApplyFadeOutEffect(std::span<sint16> samples, uint64 fadeOutDuration)
{ {
for(auto& i : samples) for(auto& i : samples)
{ {
i *= m_volumeFactor; float decibel = (float)m_fadeOutSample / fadeOutDuration * -100.0f;
if(m_volumeFactor >= fadeStep) float volumeFactor = pow(10,decibel/20);
m_volumeFactor -= fadeStep; i *= volumeFactor;
else m_fadeOutSample++;
m_volumeFactor = 0;
} }
} }
@ -206,6 +205,7 @@ class BootSoundPlayer
constexpr sint32 bitsPerSample = 16; constexpr sint32 bitsPerSample = 16;
constexpr sint32 samplesPerBlock = sampleRate / 10; // block is 1/10th of a second constexpr sint32 samplesPerBlock = sampleRate / 10; // block is 1/10th of a second
constexpr sint32 nChannels = 2; 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"); static_assert(bitsPerSample % 8 == 0, "bits per sample is not a multiple of 8");
AudioAPIPtr bootSndAudioDev; AudioAPIPtr bootSndAudioDev;
@ -240,7 +240,7 @@ class BootSoundPlayer
constexpr sint32 audioBlockSize = samplesPerBlock * (bitsPerSample/8) * nChannels; constexpr sint32 audioBlockSize = samplesPerBlock * (bitsPerSample/8) * nChannels;
BootSoundReader bootSndFileReader(bootSndFileHandle, audioBlockSize); BootSoundReader bootSndFileReader(bootSndFileHandle, audioBlockSize);
while(m_volumeFactor > 0 && !m_stopRequested) while(m_fadeOutSample < fadeOutDuration && !m_stopRequested)
{ {
while (bootSndAudioDev->NeedAdditionalBlocks()) while (bootSndAudioDev->NeedAdditionalBlocks())
{ {
@ -252,7 +252,7 @@ class BootSoundPlayer
break; break;
} }
if(m_fadeOutRequested) if(m_fadeOutRequested)
ApplyFadeOutEffect({data, samplesPerBlock * 2}, 1.0f / (sampleRate * 10.0f)); ApplyFadeOutEffect({data, samplesPerBlock * 2}, fadeOutDuration);
bootSndAudioDev->FeedBlock(data); bootSndAudioDev->FeedBlock(data);
} }
@ -268,7 +268,7 @@ class BootSoundPlayer
std::thread m_bootSndPlayThread; std::thread m_bootSndPlayThread;
std::atomic_bool m_fadeOutRequested = false; std::atomic_bool m_fadeOutRequested = false;
std::atomic_bool m_stopRequested = false; std::atomic_bool m_stopRequested = false;
float m_volumeFactor = 1.0f; uint64 m_fadeOutSample = 0;
}; };
static BootSoundPlayer g_bootSndPlayer; static BootSoundPlayer g_bootSndPlayer;