rearrange variables in header file
[software/lv2-mdametapiano.git] / src / mdaPianoVoice.cpp
1 #include "mdaPianoVoice.h"
2
3 mdaPianoVoice::mdaPianoVoice(double rate, Sample * master_samples, KGRP * master_kgrp) {
4 //set tuning
5 Fs = rate;
6 iFs = 1.0f/Fs;
7
8 samples = master_samples;
9 kgrp = master_kgrp;
10
11 default_preset[p_offset(p_envelope_decay)] = 0.500f;
12 default_preset[p_offset(p_envelope_release)] = 0.500f;
13 default_preset[p_offset(p_hardness_offset)] = 0.500f;
14 default_preset[p_offset(p_velocity_to_hardness)] = 0.500f;
15 default_preset[p_offset(p_muffling_filter)] = 0.803f;
16 default_preset[p_offset(p_velocity_to_muffling)] = 0.251f;
17 default_preset[p_offset(p_velocity_sensitivity)] = 0.376f;
18 default_preset[p_offset(p_stereo_width)] = 0.500f;
19 default_preset[p_offset(p_polyphony)] = 0.330f;
20 default_preset[p_offset(p_fine_tuning)] = 0.500f;
21 default_preset[p_offset(p_random_detuning)] = 0.246f;
22 default_preset[p_offset(p_stretch_tuning)] = 0.500f;
23
24 reset();
25 update(Default);
26 }
27
28
29 float mdaPianoVoice::p_helper(unsigned short id, Param d) {
30 if (d == Default)
31 return default_preset[p_offset(id)];
32 else
33 return *p(id);
34 }
35
36
37 void mdaPianoVoice::on(unsigned char note, unsigned char velocity) {
38 // store key that turned this voice on (used in 'get_key')
39 m_key = note;
40 update(Current);
41
42 float l=99.0f;
43 uint32_t k, s;
44
45 if(velocity > 0)
46 {
47 k = (note - 60) * (note - 60);
48 l = fine + random * ((float)(k % 13) - 6.5f); //random & fine tune
49 if(note > 60) l += stretch * (float)k; //stretch
50
51 s = size;
52 if(velocity > 40) s += (uint32_t)(sizevel * (float)(velocity - 40));
53
54 k = 0;
55 while(note > (kgrp[k].high + s)) k++; //find keygroup
56 sample_index = k; //store sample index
57
58 l += (float)(note - kgrp[k].root); //pitch
59 l = 22050.0f * iFs * (float)exp(0.05776226505 * l);
60 delta = (uint32_t)(65536.0f * l);
61 frac = 0;
62 pos = 0;
63 end = samples[sample_index].size;
64 loop = kgrp[sample_index].loop;
65
66 env = (0.5f + velsens) * (float)pow(0.0078f * velocity, velsens); //velocity
67
68 l = 50.0f + *p(p_muffling_filter) * *p(p_muffling_filter) * muff + muffvel * (float)(velocity - 64); //muffle
69 if(l < (55.0f + 0.25f * (float)note)) l = 55.0f + 0.25f * (float)note;
70 if(l > 210.0f) l = 210.0f;
71 ff = l * l * iFs;
72 f0 = f1 = 0.0f;
73
74 if(note < 12) note = 12;
75 if(note > 108) note = 108;
76 l = volume * trim;
77 outr = l + l * width * (float)(note - 60);
78 outl = l + l - outr;
79
80 if(note < 44) note = 44; //limit max decay length
81 l = 2.0f * *p(p_envelope_decay);
82 if(l < 1.0f) l += 0.25f - 0.5f * *p(p_envelope_decay);
83 dec = (float)exp(-iFs * exp(-0.6 + 0.033 * (double)note - l));
84 } else {
85 // some keyboards send note off events as 'note on' with velocity 0
86 release(0);
87 }
88 }
89
90
91 void mdaPianoVoice::reset() {
92 env = 0.0f;
93 dec = 0.99f;
94 muff = 160.0f;
95 volume = 0.2f;
96 sustain = 0;
97 cpos = 0;
98 m_key = LV2::INVALID_KEY;
99 }
100
101
102 void mdaPianoVoice::release(unsigned char velocity) {
103 if(sustain==0) {
104 //no release on highest notes
105 if(m_key < 94 || m_key == SUSTAIN) {
106 dec = (float)exp(-iFs * exp(2.0 + 0.017 * (double)m_key - 2.0 * *p(p_envelope_release)));
107 }
108 } else {
109 m_key = SUSTAIN;
110 }
111
112 //Mark the voice to be turned off later. It may not be set to
113 //INVALID_KEY yet, because the release sound still needs to be
114 //rendered. m_key is finally set to INVALID_KEY by 'render' when
115 //env < SILENCE
116 m_key = SUSTAIN;
117 }
118
119
120 void mdaPianoVoice::render(uint32_t from, uint32_t to) {
121 // abort if no key is pressed
122 // initially m_key is INVALID_KEY, so no sound will be rendered
123 if (m_key == LV2::INVALID_KEY)
124 return;
125
126 float x, l, r;
127 uint32_t i;
128
129 update(Current);
130 for (uint32_t frame = from; frame < to; ++frame) {
131 // initialize left and right output
132 l = r = 0.0f;
133
134 frac += delta; // integer-based linear interpolation
135 pos += frac >> 16;
136 frac &= 0xFFFF;
137 if(pos > end) pos -= loop;
138
139 i = samples[sample_index].buffer[pos];
140 i = (i << 7) + (frac >> 9) * (samples[sample_index].buffer[pos + 1] - i) + 0x40400000;
141 x = env * (*(float *)&i - 3.0f); //fast int->float
142
143 env = env * dec; //envelope
144 f0 += ff * (x + f1 - f0); //muffle filter
145 f1 = x;
146
147 l += outl * f0;
148 r += outr * f0;
149
150 comb[cpos] = l + r;
151 ++cpos &= 0x7F;
152 x = cdep * comb[cpos]; //stereo simulator
153
154 // write to output
155 p(p_left)[frame] += l + x;
156 p(p_right)[frame] += r - x;
157 }
158
159 // turn off further processing when the envelope has rendered the voice silent
160 if (env < SILENCE) {
161 m_key = LV2::INVALID_KEY;
162 }
163 }
164
165
166 void mdaPianoVoice::update(Param par) {
167 size = (uint32_t)(12.0f * p_helper(p_hardness_offset, par) - 6.0f);
168 sizevel = 0.12f * p_helper(p_velocity_to_hardness, par);
169 muffvel = p_helper(p_velocity_to_muffling, par) * p_helper(p_velocity_to_muffling, par) * 5.0f;
170
171 velsens = 1.0f + p_helper(p_velocity_sensitivity, par) + p_helper(p_velocity_sensitivity, par);
172 if(p_helper(p_velocity_sensitivity, par) < 0.25f) {
173 velsens -= 0.75f - 3.0f * p_helper(p_velocity_sensitivity, par);
174 }
175
176 fine = p_helper(p_fine_tuning, par) - 0.5f;
177 random = 0.077f * p_helper(p_random_detuning, par) * p_helper(p_random_detuning, par);
178 stretch = 0.000434f * (p_helper(p_stretch_tuning, par) - 0.5f);
179
180 cdep = p_helper(p_stereo_width, par) * p_helper(p_stereo_width, par);
181 trim = 1.50f - 0.79f * cdep;
182 width = 0.04f * p_helper(p_stereo_width, par); if(width > 0.03f) width = 0.03f;
183
184 poly = 8 + (uint32_t)(24.9f * p_helper(p_polyphony, par));
185 }