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43 lines
1.1 KiB
43 lines
1.1 KiB
/*
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Copyright 2013 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Low frequency oscillator, compatible with DX7
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class Lfo {
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public:
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static void init(FRAC_NUM sample_rate);
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void reset(const uint8_t params[6]);
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// result is 0..1 in Q24
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int32_t getsample();
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// result is 0..1 in Q24
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int32_t getdelay();
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void keydown();
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private:
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static uint32_t unit_;
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uint32_t phase_; // Q32
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uint32_t delta_;
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uint8_t waveform_;
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uint8_t randstate_;
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bool sync_;
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uint32_t delaystate_;
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uint32_t delayinc_;
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uint32_t delayinc2_;
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};
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