69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*
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Chassis softsynth framework
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Copyright 2024 Gordon JC Pearce <gordonjcp@gjcp.net>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _VOICE_HPP
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#define _VOICE_HPP
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#include <cstdint>
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class Voice {
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public:
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uint8_t note;
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void voiceOn(uint32_t key, bool reset = 0) {
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keyState = K_ON;
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envState = ATTACK;
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note = key;
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if (reset) env = 0;
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omega = (261.63 * powf(2, (note - 60)/12.0f))/48000.0f;
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target = 1;
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}
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void voiceOff() {
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keyState = K_OFF;
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envState = RELEASE;
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target = 0;
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}
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inline bool isFree() {
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return keyState == K_OFF;
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}
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void run(float *buffer, uint32_t samples) {
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env = ((target - env)*0.01) + env;
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for (uint32_t i = 0; i < samples; i++) {
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phase += omega;
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if (phase > 1) phase -= 1;
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buffer[i] += (0.5-phase) * env;
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}
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}
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private:
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enum { ATTACK,
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DECAY,
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SUSTAIN,
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RELEASE } envState = RELEASE;
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enum { K_OFF,
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K_ON,
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K_SUSTAIN } keyState = K_OFF;
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float phase, omega;
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float env, target;
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};
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#endif // _VOICE_HPP
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