1 // Copyright 2013 Olivier Gillet. 2 // 3 // Author: Olivier Gillet (ol.gillet@gmail.com) 4 // 5 // Permission is hereby granted, free of charge, to any person obtaining a copy 6 // of this software and associated documentation files (the "Software"), to deal 7 // in the Software without restriction, including without limitation the rights 8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 // copies of the Software, and to permit persons to whom the Software is 10 // furnished to do so, subject to the following conditions: 11 // 12 // The above copyright notice and this permission notice shall be included in 13 // all copies or substantial portions of the Software. 14 // 15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 21 // THE SOFTWARE. 22 // 23 // See http://creativecommons.org/licenses/MIT/ for more information. 24 // 25 // ----------------------------------------------------------------------------- 26 // 27 // SVF used for the envelope follower filter bank. 28 29 #ifndef STREAMS_SVF_H_ 30 #define STREAMS_SVF_H_ 31 32 #include "stmlib/stmlib.h" 33 34 namespace streams { 35 36 class Svf { 37 public: Svf()38 Svf() { } ~Svf()39 ~Svf() { } 40 41 void Init(); 42 set_frequency(int16_t frequency)43 void set_frequency(int16_t frequency) { 44 dirty_ = dirty_ || (frequency_ != frequency); 45 frequency_ = frequency; 46 } 47 set_resonance(int16_t resonance)48 void set_resonance(int16_t resonance) { 49 resonance_ = resonance; 50 dirty_ = true; 51 } 52 53 void Process(int32_t sample); lp()54 inline int32_t lp() const { return lp_; } bp()55 inline int32_t bp() const { return bp_; } hp()56 inline int32_t hp() const { return hp_; } 57 58 private: 59 bool dirty_; 60 61 int16_t frequency_; 62 int16_t resonance_; 63 64 int32_t f_; 65 int32_t damp_; 66 67 int32_t lp_; 68 int32_t bp_; 69 int32_t hp_; 70 71 DISALLOW_COPY_AND_ASSIGN(Svf); 72 }; 73 74 } // namespace streams 75 76 #endif // STREAMS_SVF_H_ 77