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91 lines
2.1 KiB
91 lines
2.1 KiB
/*
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beep.cpp - LV2 Toolkit API Demonstration Plugin
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Copyright (C) 2004-2010 Lars Luthman
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Updated for LVTK by Michael Fisher <mfisher31@gmail.com>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file beep.cpp */
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#include <lvtk/synth.hpp>
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#include "beep.peg"
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class BeepVoice : public lvtk::Voice
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{
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public:
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BeepVoice (double rate)
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: m_key(lvtk::INVALID_KEY), m_rate(rate), m_period(10), m_counter(0)
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{ }
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void
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on (unsigned char key, unsigned char velocity)
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{
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m_key = key;
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m_period = m_rate * 4.0 / lvtk::key2hz(m_key);
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}
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void
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off (unsigned char velocity)
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{
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m_key = lvtk::INVALID_KEY;
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}
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unsigned char
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get_key() const
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{
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return m_key;
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}
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void
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render(uint32_t from, uint32_t to)
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{
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if (m_key == lvtk::INVALID_KEY) return;
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for (uint32_t i = from; i < to; ++i)
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{
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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 lvtk::Synth<BeepVoice, Beep>
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{
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public:
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Beep (double rate) : lvtk::Synth<BeepVoice, Beep> (p_n_ports, p_midi)
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{
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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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