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-rw-r--r--quantum/audio/voices.c296
1 files changed, 296 insertions, 0 deletions
diff --git a/quantum/audio/voices.c b/quantum/audio/voices.c
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+++ b/quantum/audio/voices.c
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+/* Copyright 2016 Jack Humbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "voices.h"
+#include "audio.h"
+#include "stdlib.h"
+
+// these are imported from audio.c
+extern uint16_t envelope_index;
+extern float note_timbre;
+extern float polyphony_rate;
+extern bool glissando;
+
+voice_type voice = default_voice;
+
+void set_voice(voice_type v) {
+ voice = v;
+}
+
+void voice_iterate() {
+ voice = (voice + 1) % number_of_voices;
+}
+
+void voice_deiterate() {
+ voice = (voice - 1 + number_of_voices) % number_of_voices;
+}
+
+float voice_envelope(float frequency) {
+ // envelope_index ranges from 0 to 0xFFFF, which is preserved at 880.0 Hz
+ __attribute__ ((unused))
+ uint16_t compensated_index = (uint16_t)((float)envelope_index * (880.0 / frequency));
+
+ switch (voice) {
+ case default_voice:
+ glissando = false;
+ note_timbre = TIMBRE_50;
+ polyphony_rate = 0;
+ break;
+
+ #ifdef AUDIO_VOICES
+
+ case something:
+ glissando = false;
+ polyphony_rate = 0;
+ switch (compensated_index) {
+ case 0 ... 9:
+ note_timbre = TIMBRE_12;
+ break;
+
+ case 10 ... 19:
+ note_timbre = TIMBRE_25;
+ break;
+
+ case 20 ... 200:
+ note_timbre = .125 + .125;
+ break;
+
+ default:
+ note_timbre = .125;
+ break;
+ }
+ break;
+
+ case drums:
+ glissando = false;
+ polyphony_rate = 0;
+ // switch (compensated_index) {
+ // case 0 ... 10:
+ // note_timbre = 0.5;
+ // break;
+ // case 11 ... 20:
+ // note_timbre = 0.5 * (21 - compensated_index) / 10;
+ // break;
+ // default:
+ // note_timbre = 0;
+ // break;
+ // }
+ // frequency = (rand() % (int)(frequency * 1.2 - frequency)) + (frequency * 0.8);
+
+ if (frequency < 80.0) {
+
+ } else if (frequency < 160.0) {
+
+ // Bass drum: 60 - 100 Hz
+ frequency = (rand() % (int)(40)) + 60;
+ switch (envelope_index) {
+ case 0 ... 10:
+ note_timbre = 0.5;
+ break;
+ case 11 ... 20:
+ note_timbre = 0.5 * (21 - envelope_index) / 10;
+ break;
+ default:
+ note_timbre = 0;
+ break;
+ }
+
+ } else if (frequency < 320.0) {
+
+
+ // Snare drum: 1 - 2 KHz
+ frequency = (rand() % (int)(1000)) + 1000;
+ switch (envelope_index) {
+ case 0 ... 5:
+ note_timbre = 0.5;
+ break;
+ case 6 ... 20:
+ note_timbre = 0.5 * (21 - envelope_index) / 15;
+ break;
+ default:
+ note_timbre = 0;
+ break;
+ }
+
+ } else if (frequency < 640.0) {
+
+ // Closed Hi-hat: 3 - 5 KHz
+ frequency = (rand() % (int)(2000)) + 3000;
+ switch (envelope_index) {
+ case 0 ... 15:
+ note_timbre = 0.5;
+ break;
+ case 16 ... 20:
+ note_timbre = 0.5 * (21 - envelope_index) / 5;
+ break;
+ default:
+ note_timbre = 0;
+ break;
+ }
+
+ } else if (frequency < 1280.0) {
+
+ // Open Hi-hat: 3 - 5 KHz
+ frequency = (rand() % (int)(2000)) + 3000;
+ switch (envelope_index) {
+ case 0 ... 35:
+ note_timbre = 0.5;
+ break;
+ case 36 ... 50:
+ note_timbre = 0.5 * (51 - envelope_index) / 15;
+ break;
+ default:
+ note_timbre = 0;
+ break;
+ }
+
+ }
+ break;
+ case butts_fader:
+ glissando = true;
+ polyphony_rate = 0;
+ switch (compensated_index) {
+ case 0 ... 9:
+ frequency = frequency / 4;
+ note_timbre = TIMBRE_12;
+ break;
+
+ case 10 ... 19:
+ frequency = frequency / 2;
+ note_timbre = TIMBRE_12;
+ break;
+
+ case 20 ... 200:
+ note_timbre = .125 - pow(((float)compensated_index - 20) / (200 - 20), 2)*.125;
+ break;
+
+ default:
+ note_timbre = 0;
+ break;
+ }
+ break;
+
+ // case octave_crunch:
+ // polyphony_rate = 0;
+ // switch (compensated_index) {
+ // case 0 ... 9:
+ // case 20 ... 24:
+ // case 30 ... 32:
+ // frequency = frequency / 2;
+ // note_timbre = TIMBRE_12;
+ // break;
+
+ // case 10 ... 19:
+ // case 25 ... 29:
+ // case 33 ... 35:
+ // frequency = frequency * 2;
+ // note_timbre = TIMBRE_12;
+ // break;
+
+ // default:
+ // note_timbre = TIMBRE_12;
+ // break;
+ // }
+ // break;
+
+ case duty_osc:
+ // This slows the loop down a substantial amount, so higher notes may freeze
+ glissando = true;
+ polyphony_rate = 0;
+ switch (compensated_index) {
+ default:
+ #define OCS_SPEED 10
+ #define OCS_AMP .25
+ // sine wave is slow
+ // note_timbre = (sin((float)compensated_index/10000*OCS_SPEED) * OCS_AMP / 2) + .5;
+ // triangle wave is a bit faster
+ note_timbre = (float)abs((compensated_index*OCS_SPEED % 3000) - 1500) * ( OCS_AMP / 1500 ) + (1 - OCS_AMP) / 2;
+ break;
+ }
+ break;
+
+ case duty_octave_down:
+ glissando = true;
+ polyphony_rate = 0;
+ note_timbre = (envelope_index % 2) * .125 + .375 * 2;
+ if ((envelope_index % 4) == 0)
+ note_timbre = 0.5;
+ if ((envelope_index % 8) == 0)
+ note_timbre = 0;
+ break;
+ case delayed_vibrato:
+ glissando = true;
+ polyphony_rate = 0;
+ note_timbre = TIMBRE_50;
+ #define VOICE_VIBRATO_DELAY 150
+ #define VOICE_VIBRATO_SPEED 50
+ switch (compensated_index) {
+ case 0 ... VOICE_VIBRATO_DELAY:
+ break;
+ default:
+ frequency = frequency * vibrato_lut[(int)fmod((((float)compensated_index - (VOICE_VIBRATO_DELAY + 1))/1000*VOICE_VIBRATO_SPEED), VIBRATO_LUT_LENGTH)];
+ break;
+ }
+ break;
+ // case delayed_vibrato_octave:
+ // polyphony_rate = 0;
+ // if ((envelope_index % 2) == 1) {
+ // note_timbre = 0.55;
+ // } else {
+ // note_timbre = 0.45;
+ // }
+ // #define VOICE_VIBRATO_DELAY 150
+ // #define VOICE_VIBRATO_SPEED 50
+ // switch (compensated_index) {
+ // case 0 ... VOICE_VIBRATO_DELAY:
+ // break;
+ // default:
+ // frequency = frequency * VIBRATO_LUT[(int)fmod((((float)compensated_index - (VOICE_VIBRATO_DELAY + 1))/1000*VOICE_VIBRATO_SPEED), VIBRATO_LUT_LENGTH)];
+ // break;
+ // }
+ // break;
+ // case duty_fifth_down:
+ // note_timbre = 0.5;
+ // if ((envelope_index % 3) == 0)
+ // note_timbre = 0.75;
+ // break;
+ // case duty_fourth_down:
+ // note_timbre = 0.0;
+ // if ((envelope_index % 12) == 0)
+ // note_timbre = 0.75;
+ // if (((envelope_index % 12) % 4) != 1)
+ // note_timbre = 0.75;
+ // break;
+ // case duty_third_down:
+ // note_timbre = 0.5;
+ // if ((envelope_index % 5) == 0)
+ // note_timbre = 0.75;
+ // break;
+ // case duty_fifth_third_down:
+ // note_timbre = 0.5;
+ // if ((envelope_index % 5) == 0)
+ // note_timbre = 0.75;
+ // if ((envelope_index % 3) == 0)
+ // note_timbre = 0.25;
+ // break;
+
+ #endif
+
+ default:
+ break;
+ }
+
+ return frequency;
+}
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