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dexed/lv2-examples/beep.lv2tools/beep.cpp

61 lines
1.2 KiB

// from: http://ll-plugins.nongnu.org/lv2pftci/#A_synth
#include <lv2synth.hpp>
#include "beep.peg"
class BeepVoice : public LV2::Voice {
public:
BeepVoice(double rate)
: m_key(LV2::INVALID_KEY), m_rate(rate), m_period(10), m_counter(0) {
}
void on(unsigned char key, unsigned char velocity) {
m_key = key;
m_period = m_rate * 4.0 / LV2::key2hz(m_key);
}
void off(unsigned char velocity) {
m_key = LV2::INVALID_KEY;
}
unsigned char get_key() const {
return m_key;
}
void render(uint32_t from, uint32_t to) {
if (m_key == LV2::INVALID_KEY)
return;
for (uint32_t i = from; i < to; ++i) {
float s = -0.25 + 0.5 * (m_counter > m_period / 2);
m_counter = (m_counter + 1) % m_period;
p(p_left)[i] += s;
p(p_right)[i] += s;
}
}
protected:
unsigned char m_key;
double m_rate;
uint32_t m_period;
uint32_t m_counter;
};
class Beep : public LV2::Synth<BeepVoice, Beep> {
public:
Beep(double rate)
: LV2::Synth<BeepVoice, Beep>(p_n_ports, p_midi) {
add_voices(new BeepVoice(rate), new BeepVoice(rate), new BeepVoice(rate));
add_audio_outputs(p_left, p_right);
}
};
static int _ = Beep::register_class(p_uri);