Re: [LAD] LV2::Synth from one note to another

On 08/10/14 13:36, Raine M. Ekman wrote: You are probably right ; Philip's advice was good too, as the calf code is somehow simpler. Comparatively, the so-404 is very monolithic / mathematical and hard to decipher. About this tfreq calculation, a few newbie questions. Here is my *entire* synth code <https://bitbucket.org/xaccrocheur/ksi> : #include <lv2synth.hpp> #include "ksi.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); m_envelope = velocity / 128.0; } 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 pwm = *p(p_pwm) + (1 - *p(p_pwm)) * m_envelope; float s = -0.25 + 0.5 * (m_counter > m_period * (1 + pwm) / 2); // 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; if (m_envelope > 0) m_envelope -= 0.5 / m_rate; } } protected: unsigned char m_key; double m_rate; uint32_t m_period; uint32_t m_counter; float m_envelope; }; 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)); add_audio_outputs(p_left, p_right); } void post_process(uint32_t from, uint32_t to) { for (uint32_t i = from; i < to; ++i) { p(p_left)[i] *= *p(p_gain); p(p_right)[i] *= *p(p_gain); } } }; static int _ = Beep::register_class(p_uri); Apart from that there is a ksi.ttl with a lv2:port [ a ev:EventPort, lv2:InputPort; lv2:index 0; ev:supportsEvent <http://lv2plug.in/ns/ext/midi#MidiEvent>; lv2:symbol "midi"; lv2:name "MIDI"; ], (...) Witch I understand is what somehow calls a public method in the Beep class, that in turns uses public methods in the BeepVoice class, who does the final rendering, magically connecting to [ a lv2:AudioPort, lv2:OutputPort; lv2:index 1; lv2:symbol "left"; lv2:name "Left"; pg:membership [ pg:group <http://ll-plugins.nongnu.org/lv2/lv2pftci/ksi/out>; pg:role pg:leftChannel; ]; ], [ a lv2:AudioPort, lv2:OutputPort; lv2:index 2; lv2:symbol "right"; lv2:name "Right"; pg:membership [ pg:group <http://ll-plugins.nongnu.org/lv2/lv2pftci/ksi/out>; pg:role pg:rightChannel; ]; ], To output sound (and it does, and it sounds good). In order to implement the frequency calculation, what would be the rough roadmap, the synthetic (so to speak) bullet points ? Thank you for your patience. -- Philippe