109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/* Copyright 2016 Jack Humbert
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef AUDIO_H
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#define AUDIO_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "musical_notes.h"
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#include "song_list.h"
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#include "voices.h"
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#include "quantum.h"
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// Largely untested PWM audio mode (doesn't sound as good)
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// #define PWM_AUDIO
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// #define VIBRATO_ENABLE
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// Enable vibrato strength/amplitude - slows down ISR too much
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// #define VIBRATO_STRENGTH_ENABLE
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typedef union {
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uint8_t raw;
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struct {
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bool enable :1;
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uint8_t level :7;
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};
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} audio_config_t;
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bool is_audio_on(void);
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void audio_toggle(void);
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void audio_on(void);
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void audio_off(void);
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// Vibrato rate functions
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#ifdef VIBRATO_ENABLE
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void set_vibrato_rate(float rate);
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void increase_vibrato_rate(float change);
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void decrease_vibrato_rate(float change);
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#ifdef VIBRATO_STRENGTH_ENABLE
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void set_vibrato_strength(float strength);
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void increase_vibrato_strength(float change);
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void decrease_vibrato_strength(float change);
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#endif
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#endif
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// Polyphony functions
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void set_polyphony_rate(float rate);
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void enable_polyphony(void);
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void disable_polyphony(void);
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void increase_polyphony_rate(float change);
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void decrease_polyphony_rate(float change);
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void set_timbre(float timbre);
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void set_tempo(uint8_t tempo);
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void increase_tempo(uint8_t tempo_change);
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void decrease_tempo(uint8_t tempo_change);
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void audio_init(void);
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#ifdef PWM_AUDIO
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void play_sample(uint8_t * s, uint16_t l, bool r);
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#endif
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void play_note(float freq, int vol);
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void stop_note(float freq);
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void stop_all_notes(void);
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void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat);
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#define SCALE (int8_t []){ 0 + (12*0), 2 + (12*0), 4 + (12*0), 5 + (12*0), 7 + (12*0), 9 + (12*0), 11 + (12*0), \
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0 + (12*1), 2 + (12*1), 4 + (12*1), 5 + (12*1), 7 + (12*1), 9 + (12*1), 11 + (12*1), \
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0 + (12*2), 2 + (12*2), 4 + (12*2), 5 + (12*2), 7 + (12*2), 9 + (12*2), 11 + (12*2), \
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0 + (12*3), 2 + (12*3), 4 + (12*3), 5 + (12*3), 7 + (12*3), 9 + (12*3), 11 + (12*3), \
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0 + (12*4), 2 + (12*4), 4 + (12*4), 5 + (12*4), 7 + (12*4), 9 + (12*4), 11 + (12*4), }
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// These macros are used to allow play_notes to play an array of indeterminate
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// length. This works around the limitation of C's sizeof operation on pointers.
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// The global float array for the song must be used here.
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#define NOTE_ARRAY_SIZE(x) ((int16_t)(sizeof(x) / (sizeof(x[0]))))
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#define PLAY_NOTE_ARRAY(note_array, note_repeat, deprecated_arg) play_notes(¬e_array, NOTE_ARRAY_SIZE((note_array)), (note_repeat)); \
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_Pragma ("message \"'PLAY_NOTE_ARRAY' macro is deprecated\"")
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#define PLAY_SONG(note_array) play_notes(¬e_array, NOTE_ARRAY_SIZE((note_array)), false)
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#define PLAY_LOOP(note_array) play_notes(¬e_array, NOTE_ARRAY_SIZE((note_array)), true)
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bool is_playing_notes(void);
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#endif
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