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#include "mdaPianoVoice.h"
mdaPianoVoice::mdaPianoVoice(double rate, Sample * master_samples, KGRP * master_kgrp) {
//set tuning
Fs = rate;
iFs = 1.0f/Fs;
samples = master_samples;
kgrp = master_kgrp;
default_preset[p_offset(p_envelope_decay)] = 0.500f;
default_preset[p_offset(p_envelope_release)] = 0.500f;
default_preset[p_offset(p_hardness_offset)] = 0.500f;
default_preset[p_offset(p_velocity_to_hardness)] = 0.500f;
default_preset[p_offset(p_muffling_filter)] = 0.803f;
default_preset[p_offset(p_velocity_to_muffling)] = 0.251f;
default_preset[p_offset(p_velocity_sensitivity)] = 0.376f;
default_preset[p_offset(p_stereo_width)] = 0.500f;
default_preset[p_offset(p_polyphony)] = 0.330f; // unused
default_preset[p_offset(p_fine_tuning)] = 0.500f;
default_preset[p_offset(p_random_detuning)] = 0.246f;
default_preset[p_offset(p_stretch_tuning)] = 0.500f;
reset();
update(Default);
}
float mdaPianoVoice::p_helper(unsigned short id, Param d) {
if (d == Default)
return default_preset[p_offset(id)];
else
return *p(id);
}
void mdaPianoVoice::on(unsigned char key, unsigned char velocity) {
// store key that turned this voice on (used in 'get_key')
m_key = key;
update(Current);
float l=99.0f;
uint32_t k, s;
if(velocity > 0)
{
k = (key - 60) * (key - 60);
l = fine + random * ((float)(k % 13) - 6.5f); //random & fine tune
if(key > 60) l += stretch * (float)k; //stretch
s = size;
if(velocity > 40) s += (uint32_t)(sizevel * (float)(velocity - 40));
k = 0;
while(key > (kgrp[k].high + s)) k += SAMPLES_PER_NOTE; // find keygroup
sample_index = k; // store sample index
l += (float)(key - kgrp[k].root); // pitch
l = 22050.0f * iFs * (float)exp(0.05776226505 * l);
delta = (uint32_t)(65536.0f * l);
frac = 0;
pos = 0;
end = samples[sample_index].size;
loop = kgrp[sample_index].loop;
env = (0.5f + velsens) * (float)pow(0.0078f * velocity, velsens); //velocity
l = 50.0f + *p(p_muffling_filter) * *p(p_muffling_filter) * muff + muffvel * (float)(velocity - 64); //muffle
if(l < (55.0f + 0.25f * (float)key)) l = 55.0f + 0.25f * (float)key;
if(l > 210.0f) l = 210.0f;
ff = l * l * iFs;
f0 = f1 = 0.0f;
// note->pan
if(key < 12) key = 12;
if(key > 108) key = 108;
l = volume * trim;
outr = l + l * width * (float)(key - 60);
outl = l + l - outr;
if(key < 44) key = 44; //limit max decay length
l = 2.0f * *p(p_envelope_decay);
if(l < 1.0f) l += 0.25f - 0.5f * *p(p_envelope_decay);
dec = (float)exp(-iFs * exp(-0.6 + 0.033 * (double)key - l));
} else {
// some keyboards send note off events as 'note on' with velocity 0
release(0);
}
}
void mdaPianoVoice::reset() {
env = 0.0f;
dec = 0.99f;
muff = 160.0f;
volume = 0.2f;
sustain = 0;
cpos = 0;
m_key = LV2::INVALID_KEY;
}
void mdaPianoVoice::release(unsigned char velocity) {
if(sustain==0) {
//no release on highest notes
if(m_key < 94 || m_key == SUSTAIN) {
dec = (float)exp(-iFs * exp(2.0 + 0.017 * (double)m_key - 2.0 * *p(p_envelope_release)));
}
} else {
m_key = SUSTAIN;
}
//Mark the voice to be turned off later. It may not be set to
//INVALID_KEY yet, because the release sound still needs to be
//rendered. m_key is finally set to INVALID_KEY by 'render' when
//env < SILENCE
m_key = SUSTAIN;
}
void mdaPianoVoice::render(uint32_t from, uint32_t to) {
// abort if no key is pressed
// initially m_key is INVALID_KEY, so no sound will be rendered
if (m_key == LV2::INVALID_KEY)
return;
float x, l, r;
uint32_t i;
update(Current);
for (uint32_t frame = from; frame < to; ++frame) {
// initialize left and right output
l = r = 0.0f;
frac += delta; // integer-based linear interpolation
pos += frac >> 16;
frac &= 0xFFFF;
if(pos > end) pos -= loop;
i = samples[sample_index].buffer[pos];
i = (i << 7) + (frac >> 9) * (samples[sample_index].buffer[pos + 1] - i) + 0x40400000;
x = env * (*(float *)&i - 3.0f); //fast int->float
env = env * dec; //envelope
f0 += ff * (x + f1 - f0); //muffle filter
f1 = x;
l += outl * f0;
r += outr * f0;
comb[cpos] = l + r;
++cpos &= 0x7F;
x = cdep * comb[cpos]; //stereo simulator
// write to output
p(p_left)[frame] += l + x;
p(p_right)[frame] += r - x;
}
// turn off further processing when the envelope has rendered the voice silent
if (env < SILENCE) {
m_key = LV2::INVALID_KEY;
}
}
void mdaPianoVoice::update(Param par) {
size = (uint32_t)(12.0f * p_helper(p_hardness_offset, par) - 6.0f);
sizevel = 0.12f * p_helper(p_velocity_to_hardness, par);
muffvel = p_helper(p_velocity_to_muffling, par) * p_helper(p_velocity_to_muffling, par) * 5.0f;
velsens = 1.0f + p_helper(p_velocity_sensitivity, par) + p_helper(p_velocity_sensitivity, par);
if(p_helper(p_velocity_sensitivity, par) < 0.25f) {
velsens -= 0.75f - 3.0f * p_helper(p_velocity_sensitivity, par);
}
fine = p_helper(p_fine_tuning, par) - 0.5f;
random = 0.077f * p_helper(p_random_detuning, par) * p_helper(p_random_detuning, par);
stretch = 0.000434f * (p_helper(p_stretch_tuning, par) - 0.5f);
cdep = p_helper(p_stereo_width, par) * p_helper(p_stereo_width, par);
trim = 1.50f - 0.79f * cdep;
width = 0.04f * p_helper(p_stereo_width, par); if(width > 0.03f) width = 0.03f;
}
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