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