1 // Copyright 2013 Emilie Gillet. 2 // 3 // Author: Emilie Gillet (emilie.o.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 // 808-style snare drum. 28 29 #ifndef PEAKS_DRUMS_SNARE_DRUM_H_ 30 #define PEAKS_DRUMS_SNARE_DRUM_H_ 31 32 #include "stmlib/stmlib.h" 33 34 #include "peaks/drums/svf.h" 35 #include "peaks/drums/excitation.h" 36 37 #include <cstdio> 38 39 #include "peaks/gate_processor.h" 40 41 namespace peaks { 42 43 class SnareDrum { 44 public: SnareDrum()45 SnareDrum() { } ~SnareDrum()46 ~SnareDrum() { } 47 48 void Init(); 49 void Process(const GateFlags* gate_flags, int16_t* out, size_t size); 50 Configure(uint16_t * parameter,ControlMode control_mode)51 void Configure(uint16_t* parameter, ControlMode control_mode) { 52 if (control_mode == CONTROL_MODE_HALF) { 53 set_frequency(0); 54 set_decay(32768); 55 set_tone(parameter[0]); 56 set_snappy(parameter[1]); 57 } else { 58 set_frequency(parameter[0] - 32768); 59 set_tone(parameter[1]); 60 set_snappy(parameter[2]); 61 set_decay(parameter[3]); 62 } 63 } 64 set_tone(uint16_t tone)65 void set_tone(uint16_t tone) { 66 gain_1_ = 22000 - (tone >> 2); 67 gain_2_ = 22000 + (tone >> 2); 68 } 69 set_snappy(uint16_t snappy)70 void set_snappy(uint16_t snappy) { 71 snappy >>= 1; 72 if (snappy >= 28672) { 73 snappy = 28672; 74 } 75 snappy_ = 512 + snappy; 76 } 77 set_decay(uint16_t decay)78 void set_decay(uint16_t decay) { 79 body_1_.set_resonance(29000 + (decay >> 5)); 80 body_2_.set_resonance(26500 + (decay >> 5)); 81 excitation_noise_.set_decay(4092 + (decay >> 14)); 82 } 83 set_frequency(int16_t frequency)84 void set_frequency(int16_t frequency) { 85 int16_t base_note = 52 << 7; 86 int32_t transposition = frequency; 87 base_note += transposition * 896 >> 15; 88 body_1_.set_frequency(base_note); 89 body_2_.set_frequency(base_note + (12 << 7)); 90 noise_.set_frequency(base_note + (48 << 7)); 91 } 92 93 private: 94 Excitation excitation_1_up_; 95 Excitation excitation_1_down_; 96 Excitation excitation_2_; 97 Excitation excitation_noise_; 98 Svf body_1_; 99 Svf body_2_; 100 Svf noise_; 101 102 int32_t gain_1_; 103 int32_t gain_2_; 104 105 uint16_t snappy_; 106 107 DISALLOW_COPY_AND_ASSIGN(SnareDrum); 108 }; 109 110 } // namespace peaks 111 112 #endif // PEAKS_DRUMS_SNARE_DRUM_H_ 113