[2425] | 1 | //synth.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009 |
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| 5 | * |
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| 6 | * This file is part of libroardsp a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroardsp is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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| 25 | #include "libroardsp.h" |
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| 26 | |
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[2482] | 27 | #if !defined(ROAR_HAVE_LIBM) && !defined(M_PI) |
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| 28 | #define M_PI 3.141592 |
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| 29 | #endif |
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| 30 | |
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[2426] | 31 | #define _CHECK_BASIC() if ( state == NULL ) return -1 |
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[2427] | 32 | #define _CHECK_PCMOUT() _CHECK_BASIC(); if ( frames == 0 ) return 0; if ( out == NULL ) return -1 |
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[2426] | 33 | |
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| 34 | int roar_synth_init(struct roar_synth_state * state, struct roar_note_octave * note, int rate) { |
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| 35 | _CHECK_BASIC(); |
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| 36 | |
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| 37 | if ( rate <= 0 ) |
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| 38 | return -1; |
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| 39 | |
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| 40 | memset(state, 0, sizeof(struct roar_synth_state)); |
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| 41 | |
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[2432] | 42 | state->note = note; // NULL is valid here! |
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| 43 | state->rate = rate; |
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| 44 | state->volume = 1; |
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[2426] | 45 | |
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[2483] | 46 | state->func = ROAR_SYNTH_SYNF_DEFAULT; |
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[2426] | 47 | |
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| 48 | return 0; |
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| 49 | } |
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| 50 | |
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| 51 | int roar_synth_set_offset(struct roar_synth_state * state, size_t offset) { |
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| 52 | _CHECK_BASIC(); |
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| 53 | |
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| 54 | state->pcmoffset = offset; |
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| 55 | |
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| 56 | return 0; |
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| 57 | } |
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| 58 | |
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| 59 | int roar_synth_set_func (struct roar_synth_state * state, ROAR_SYNTH_FUNC_TYPE(func)) { |
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| 60 | _CHECK_BASIC(); |
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| 61 | |
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[2427] | 62 | if ( func == NULL ) |
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| 63 | return -1; |
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| 64 | |
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[2426] | 65 | state->func = func; |
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| 66 | |
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| 67 | return 0; |
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| 68 | } |
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| 69 | |
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[2432] | 70 | int roar_synth_set_volume(struct roar_synth_state * state, float volume) { |
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| 71 | _CHECK_BASIC(); |
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| 72 | |
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| 73 | state->volume = volume; |
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| 74 | |
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| 75 | return 0; |
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| 76 | } |
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| 77 | |
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[2426] | 78 | int roar_synth_pcmout_i16n(struct roar_synth_state * state, int16_t * out, size_t frames, int channels) { |
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[2427] | 79 | _CHECK_PCMOUT(); |
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[2426] | 80 | |
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| 81 | switch (channels) { |
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| 82 | case 1: return roar_synth_pcmout_i161(state, out, frames); |
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| 83 | default: |
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| 84 | return -1; |
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| 85 | } |
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| 86 | |
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| 87 | return 0; |
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| 88 | } |
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| 89 | |
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| 90 | int roar_synth_pcmout_i161(struct roar_synth_state * state, int16_t * out, size_t frames) { |
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[2427] | 91 | float t_step; |
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| 92 | float t_cur; |
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[2429] | 93 | float freq; |
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[2475] | 94 | #ifdef DEBUG |
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| 95 | float cv0, cv1; |
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| 96 | #endif |
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[2427] | 97 | int i; |
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| 98 | |
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| 99 | _CHECK_PCMOUT(); |
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| 100 | |
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| 101 | t_step = 1.0/state->rate; |
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| 102 | |
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[2474] | 103 | ROAR_DBG("roar_synth_pcmout_i161(*): state->pcmoffset=%lu", (unsigned long)state->pcmoffset); |
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| 104 | |
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[2475] | 105 | t_cur = (float)state->pcmoffset/(float)state->rate; |
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[2427] | 106 | |
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[2429] | 107 | freq = state->note->freq; |
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| 108 | |
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[2475] | 109 | ROAR_DBG("roar_synth_pcmout_i161(*): t_cur=%f, freq=%f", t_cur, freq); |
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| 110 | |
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| 111 | #ifdef DEBUG |
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| 112 | cv0 = 2.0*M_PI*freq*t_cur; |
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| 113 | #endif |
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[2427] | 114 | for (i = 0; i < frames; i++, t_cur += t_step) { |
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[2432] | 115 | out[i] = 32767.0*state->volume*state->func(2.0*M_PI*freq*t_cur, state); |
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[2427] | 116 | } |
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[2475] | 117 | #ifdef DEBUG |
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| 118 | cv1 = 2.0*M_PI*freq*t_cur; |
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| 119 | #endif |
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| 120 | |
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| 121 | #ifdef DEBUG |
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| 122 | ROAR_DBG("roar_synth_pcmout_i161(*): cv0=%f, cv1=%f, cv1-cv0=%f", cv0, cv1, cv1-cv0); |
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| 123 | #endif |
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[2427] | 124 | |
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| 125 | state->pcmoffset += frames; |
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[2426] | 126 | |
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[2474] | 127 | ROAR_DBG("roar_synth_pcmout_i161(*): state->pcmoffset=%lu", (unsigned long)state->pcmoffset); |
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| 128 | |
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[2428] | 129 | return 0; |
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[2426] | 130 | } |
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| 131 | |
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[2430] | 132 | // basic SINFs: |
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| 133 | float roar_synth_synf_rect (float t, struct roar_synth_state * state) { |
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| 134 | t /= 2*M_PI; |
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| 135 | t -= (int)t; |
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| 136 | |
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| 137 | if ( t < 0.5 ) |
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| 138 | return 1; |
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| 139 | else |
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| 140 | return -1; |
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| 141 | } |
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| 142 | |
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| 143 | float roar_synth_synf_saw (float t, struct roar_synth_state * state) { |
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| 144 | t /= 2*M_PI; |
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| 145 | t -= (int)t; |
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| 146 | |
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| 147 | return 2*t - 1; |
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| 148 | } |
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| 149 | |
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| 150 | float roar_synth_synf_tri (float t, struct roar_synth_state * state) { |
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| 151 | t /= 2*M_PI; |
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| 152 | t -= (int)t; |
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| 153 | |
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| 154 | if ( t < 0.5 ) |
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| 155 | return 4* t - 1; |
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| 156 | else |
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| 157 | return -4*(t-0.5) + 1; |
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| 158 | } |
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| 159 | |
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| 160 | float roar_synth_synf_trap (float t, struct roar_synth_state * state) { |
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| 161 | t /= 2*M_PI; |
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| 162 | t -= (int)t; |
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| 163 | |
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| 164 | if ( t < 0.125 || t > 0.875 ) { |
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| 165 | return -1; |
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| 166 | } else if ( t < 0.625 && t > 0.375 ) { |
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| 167 | return 1; |
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| 168 | } else if ( t < 0.5 ) { |
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| 169 | return 8*(t-0.375) + 1; |
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| 170 | } else { |
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| 171 | return -8*(t-0.625) + 1; |
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| 172 | } |
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| 173 | } |
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[2425] | 174 | |
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[2482] | 175 | #ifdef ROAR_HAVE_LIBM |
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[2431] | 176 | float roar_synth_synf_s2s (float t, struct roar_synth_state * state) { |
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| 177 | float sin2 = sinf(t/1.2); |
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| 178 | |
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| 179 | return sin2*sin2 * sin(t*1.2); |
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| 180 | } |
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[2482] | 181 | #endif |
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[2431] | 182 | |
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[2425] | 183 | //ll |
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