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Piano: Make decay more accurate

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1. Make decay sample-granular rather than buffer-granular
You only have ~43 buffers per second which can make a jagged signal.

2. Calculate decay in milliseconds
Decay is supposed to be a time value.
This commit is contained in:
William McPherson 2020-02-05 01:36:30 +11:00 • committed by Andreas Kling
parent 44c81ee9db
commit 421a340572
3 changed files with 21 additions and 12 deletions
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28
Applications/Piano/AudioEngine.cpp
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@ -31,6 +31,7 @@
AudioEngine::AudioEngine()
{
set_decay(0);
}
AudioEngine::~AudioEngine()
@ -45,6 +46,11 @@ void AudioEngine::fill_buffer(FixedArray<Sample>& buffer)
for (size_t note = 0; note < note_count; ++note) {
if (!m_note_on[note])
continue;
m_power[note] -= m_decay_step;
if (m_power[note] < 0)
m_power[note] = 0;
double val = 0;
switch (m_wave) {
case Wave::Sine:
@ -70,16 +76,6 @@ void AudioEngine::fill_buffer(FixedArray<Sample>& buffer)
buffer[i].right = buffer[i].left;
}
if (m_decay) {
for (size_t note = 0; note < note_count; ++note) {
if (m_note_on[note]) {
m_power[note] -= m_decay / 100.0;
if (m_power[note] < 0)
m_power[note] = 0;
}
}
}
if (m_delay) {
if (m_delay_buffers.size() >= m_delay) {
auto to_blend = m_delay_buffers.dequeue();
@ -201,10 +197,22 @@ void AudioEngine::set_wave(Direction direction)
}
}
static inline double calculate_step(double distance, int milliseconds)
{
if (milliseconds == 0)
return distance;
constexpr double samples_per_millisecond = sample_rate / 1000.0;
double samples = milliseconds * samples_per_millisecond;
double step = distance / samples;
return step;
}
void AudioEngine::set_decay(int decay)
{
ASSERT(decay >= 0);
m_decay = decay;
m_decay_step = calculate_step(1, m_decay);
}
void AudioEngine::set_delay(int delay)