qmk_firmware

QMK firmware for my keyboards (Corne, Sweep Ferris) and trackball (Ploopy Adept)
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process_audio.c (1524B)

      1 #include "audio.h"
      2 #include "process_audio.h"
      3 #include <math.h>
      4 
      5 #ifndef VOICE_CHANGE_SONG
      6 #    define VOICE_CHANGE_SONG SONG(VOICE_CHANGE_SOUND)
      7 #endif
      8 float voice_change_song[][2] = VOICE_CHANGE_SONG;
      9 
     10 #ifndef PITCH_STANDARD_A
     11 #    define PITCH_STANDARD_A 440.0f
     12 #endif
     13 
     14 float compute_freq_for_midi_note(uint8_t note) {
     15     // https://en.wikipedia.org/wiki/MIDI_tuning_standard
     16     return powf(2.0f, (note - 69) / 12.0f) * PITCH_STANDARD_A;
     17 }
     18 
     19 bool process_audio(uint16_t keycode, keyrecord_t *record) {
     20     if (keycode == QK_AUDIO_ON && record->event.pressed) {
     21         audio_on();
     22         return false;
     23     }
     24 
     25     if (keycode == QK_AUDIO_OFF && record->event.pressed) {
     26         audio_off();
     27         return false;
     28     }
     29 
     30     if (keycode == QK_AUDIO_TOGGLE && record->event.pressed) {
     31         if (is_audio_on()) {
     32             audio_off();
     33         } else {
     34             audio_on();
     35         }
     36         return false;
     37     }
     38 
     39     if (keycode == QK_AUDIO_VOICE_NEXT && record->event.pressed) {
     40         voice_iterate();
     41         PLAY_SONG(voice_change_song);
     42         return false;
     43     }
     44 
     45     if (keycode == QK_AUDIO_VOICE_PREVIOUS && record->event.pressed) {
     46         voice_deiterate();
     47         PLAY_SONG(voice_change_song);
     48         return false;
     49     }
     50 
     51     return true;
     52 }
     53 
     54 void process_audio_noteon(uint8_t note) {
     55     play_note(compute_freq_for_midi_note(note), 0xF);
     56 }
     57 
     58 void process_audio_noteoff(uint8_t note) {
     59     stop_note(compute_freq_for_midi_note(note));
     60 }
     61 
     62 void process_audio_all_notes_off(void) {
     63     stop_all_notes();
     64 }