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LibDSP+LibAudio: Use logarithmic scaling in delay effect

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With logarithmic volume scaling, the delay effect can sound more
natural.
This commit is contained in:
kleines Filmröllchen 2021-09-02 19:43:10 +02:00 • committed by Andreas Kling
parent 152ec28da0
commit ab4a2b8b41
2 changed files with 3 additions and 4 deletions
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2
Userland/Libraries/LibAudio/Buffer.h
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@ -78,7 +78,7 @@ struct Frame {
return *this;
}
ALWAYS_INLINE Frame log_multiplied(double const volume_change)
ALWAYS_INLINE Frame log_multiplied(double const volume_change) const
{
Frame new_frame { left, right };
new_frame.log_multiply(volume_change);

5
Userland/Libraries/LibDSP/Effects.cpp
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@ -39,9 +39,8 @@ Signal Delay::process_impl(Signal const& input_signal)
Sample const& in = input_signal.get<Sample>();
Sample out;
// FIXME: Once we have log scaling, change these to use it instead
out += in.scaled(static_cast<double>(m_dry_gain));
out += m_delay_buffer[m_delay_index].scaled(m_delay_decay);
out += in.log_multiplied(static_cast<double>(m_dry_gain));
out += m_delay_buffer[m_delay_index].log_multiplied(m_delay_decay);
// This is also convenient for disabling the delay effect by setting the buffer size to 0
if (m_delay_buffer.size() >= 1)