diff options
Diffstat (limited to 'quantum/audio/audio.h')
| -rw-r--r-- | quantum/audio/audio.h | 280 |
1 files changed, 230 insertions, 50 deletions
diff --git a/quantum/audio/audio.h b/quantum/audio/audio.h index bc00cd19e6..56b9158a1a 100644 --- a/quantum/audio/audio.h +++ b/quantum/audio/audio.h @@ -1,4 +1,5 @@ -/* Copyright 2016 Jack Humbert +/* Copyright 2016-2020 Jack Humbert + * Copyright 2020 JohSchneider * * 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 @@ -13,28 +14,30 @@ * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ - #pragma once #include <stdint.h> #include <stdbool.h> -#if defined(__AVR__) -# include <avr/io.h> -#endif -#include "wait.h" #include "musical_notes.h" #include "song_list.h" #include "voices.h" #include "quantum.h" #include <math.h> -// Largely untested PWM audio mode (doesn't sound as good) -// #define PWM_AUDIO - -// #define VIBRATO_ENABLE +#if defined(__AVR__) +# include <avr/io.h> +# if defined(AUDIO_DRIVER_PWM) +# include "driver_avr_pwm.h" +# endif +#endif -// Enable vibrato strength/amplitude - slows down ISR too much -// #define VIBRATO_STRENGTH_ENABLE +#if defined(PROTOCOL_CHIBIOS) +# if defined(AUDIO_DRIVER_PWM) +# include "driver_chibios_pwm.h" +# elif defined(AUDIO_DRIVER_DAC) +# include "driver_chibios_dac.h" +# endif +#endif typedef union { uint8_t raw; @@ -45,61 +48,238 @@ typedef union { }; } audio_config_t; -bool is_audio_on(void); +// AVR/LUFA has a MIN, arm/chibios does not +#ifndef MIN +# define MIN(a, b) (((a) < (b)) ? (a) : (b)) +#endif + +/* + * a 'musical note' is represented by pitch and duration; a 'musical tone' adds intensity and timbre + * https://en.wikipedia.org/wiki/Musical_tone + * "A musical tone is characterized by its duration, pitch, intensity (or loudness), and timbre (or quality)" + */ +typedef struct { + uint16_t time_started; // timestamp the tone/note was started, system time runs with 1ms resolution -> 16bit timer overflows every ~64 seconds, long enough under normal circumstances; but might be too soon for long-duration notes when the note_tempo is set to a very low value + float pitch; // aka frequency, in Hz + uint16_t duration; // in ms, converted from the musical_notes.h unit which has 64parts to a beat, factoring in the current tempo in beats-per-minute + // float intensity; // aka volume [0,1] TODO: not used at the moment; pwm drivers can't handle it + // uint8_t timbre; // range: [0,100] TODO: this currently kept track of globally, should we do this per tone instead? +} musical_tone_t; + +// public interface + +/** + * @brief one-time initialization called by quantum/quantum.c + * @details usually done lazy, when some tones are to be played + * + * @post audio system (and hardware) initialized and ready to play tones + */ +void audio_init(void); +void audio_startup(void); + +/** + * @brief en-/disable audio output, save this choice to the eeprom + */ void audio_toggle(void); +/** + * @brief enable audio output, save this choice to the eeprom + */ void audio_on(void); +/** + * @brief disable audio output, save this choice to the eeprom + */ void audio_off(void); +/** + * @brief query the if audio output is enabled + */ +bool audio_is_on(void); + +/** + * @brief start playback of a tone with the given frequency and duration + * + * @details starts the playback of a given note, which is automatically stopped + * at the the end of its duration = fire&forget + * + * @param[in] pitch frequency of the tone be played + * @param[in] duration in milliseconds, use 'audio_duration_to_ms' to convert + * from the musical_notes.h unit to ms + */ +void audio_play_note(float pitch, uint16_t duration); +// TODO: audio_play_note(float pitch, uint16_t duration, float intensity, float timbre); +// audio_play_note_with_instrument ifdef AUDIO_ENABLE_VOICES + +/** + * @brief start playback of a tone with the given frequency + * + * @details the 'frequency' is put on-top the internal stack of active tones, + * as a new tone with indefinite duration. this tone is played by + * the hardware until a call to 'audio_stop_tone'. + * should a tone with that frequency already be active, its entry + * is put on the top of said internal stack - so no duplicate + * entries are kept. + * 'hardware_start' is called upon the first note. + * + * @param[in] pitch frequency of the tone be played + */ +void audio_play_tone(float pitch); + +/** + * @brief stop a given tone/frequency + * + * @details removes a tone matching the given frequency from the internal + * playback stack + * the hardware is stopped in case this was the last/only frequency + * being played. + * + * @param[in] pitch tone/frequency to be stopped + */ +void audio_stop_tone(float pitch); -// Vibrato rate functions +/** + * @brief play a melody + * + * @details starts playback of a melody passed in from a SONG definition - an + * array of {pitch, duration} float-tuples + * + * @param[in] np note-pointer to the SONG array + * @param[in] n_count number of MUSICAL_NOTES of the SONG + * @param[in] n_repeat false for onetime, true for looped playback + */ +void audio_play_melody(float (*np)[][2], uint16_t n_count, bool n_repeat); -#ifdef VIBRATO_ENABLE +/** + * @brief play a short tone of a specific frequency to emulate a 'click' + * + * @details constructs a two-note melody (one pause plus a note) and plays it through + * audio_play_melody. very short durations might not quite work due to + * hardware limitations (DAC: added pulses from zero-crossing feature;...) + * + * @param[in] delay in milliseconds, length for the pause before the pulses, can be zero + * @param[in] pitch + * @param[in] duration in milliseconds, length of the 'click' + */ +void audio_play_click(uint16_t delay, float pitch, uint16_t duration); -void set_vibrato_rate(float rate); -void increase_vibrato_rate(float change); -void decrease_vibrato_rate(float change); +/** + * @brief stops all playback + * + * @details stops playback of both a melody as well as single tones, resetting + * the internal state + */ +void audio_stop_all(void); -# ifdef VIBRATO_STRENGTH_ENABLE +/** + * @brief query if one/multiple tones are playing + */ +bool audio_is_playing_note(void); -void set_vibrato_strength(float strength); -void increase_vibrato_strength(float change); -void decrease_vibrato_strength(float change); +/** + * @brief query if a melody/SONG is playing + */ +bool audio_is_playing_melody(void); -# endif +// These macros are used to allow audio_play_melody to play an array of indeterminate +// length. This works around the limitation of C's sizeof operation on pointers. +// The global float array for the song must be used here. +#define NOTE_ARRAY_SIZE(x) ((int16_t)(sizeof(x) / (sizeof(x[0])))) + +/** + * @brief convenience macro, to play a melody/SONG once + */ +#define PLAY_SONG(note_array) audio_play_melody(¬e_array, NOTE_ARRAY_SIZE((note_array)), false) +// TODO: a 'song' is a melody plus singing/vocals -> PLAY_MELODY +/** + * @brief convenience macro, to play a melody/SONG in a loop, until stopped by 'audio_stop_all' + */ +#define PLAY_LOOP(note_array) audio_play_melody(¬e_array, NOTE_ARRAY_SIZE((note_array)), true) +// Tone-Multiplexing functions +// this feature only makes sense for hardware setups which can't do proper +// audio-wave synthesis = have no DAC and need to use PWM for tone generation +#ifdef AUDIO_ENABLE_TONE_MULTIPLEXING +# ifndef AUDIO_TONE_MULTIPLEXING_RATE_DEFAULT +# define AUDIO_TONE_MULTIPLEXING_RATE_DEFAULT 0 +// 0=off, good starting value is 4; the lower the value the higher the cpu-load +# endif +void audio_set_tone_multiplexing_rate(uint16_t rate); +void audio_enable_tone_multiplexing(void); +void audio_disable_tone_multiplexing(void); +void audio_increase_tone_multiplexing_rate(uint16_t change); +void audio_decrease_tone_multiplexing_rate(uint16_t change); #endif -// Polyphony functions +// Tempo functions -void set_polyphony_rate(float rate); -void enable_polyphony(void); -void disable_polyphony(void); -void increase_polyphony_rate(float change); -void decrease_polyphony_rate(float change); +void audio_set_tempo(uint8_t tempo); +void audio_increase_tempo(uint8_t tempo_change); +void audio_decrease_tempo(uint8_t tempo_change); -void set_timbre(float timbre); -void set_tempo(uint8_t tempo); +// conversion macros, from 64parts-to-a-beat to milliseconds and back +uint16_t audio_duration_to_ms(uint16_t duration_bpm); +uint16_t audio_ms_to_duration(uint16_t duration_ms); -void increase_tempo(uint8_t tempo_change); -void decrease_tempo(uint8_t tempo_change); +void audio_startup(void); -void audio_init(void); +// hardware interface -#ifdef PWM_AUDIO -void play_sample(uint8_t* s, uint16_t l, bool r); -#endif -void play_note(float freq, int vol); -void stop_note(float freq); -void stop_all_notes(void); -void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat); +// implementation in the driver_avr/arm_* respective parts +void audio_driver_initialize(void); +void audio_driver_start(void); +void audio_driver_stop(void); -#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), 0 + (12 * 1), 2 + (12 * 1), 4 + (12 * 1), 5 + (12 * 1), 7 + (12 * 1), 9 + (12 * 1), 11 + (12 * 1), 0 + (12 * 2), 2 + (12 * 2), 4 + (12 * 2), 5 + (12 * 2), 7 + (12 * 2), 9 + (12 * 2), 11 + (12 * 2), 0 + (12 * 3), 2 + (12 * 3), 4 + (12 * 3), 5 + (12 * 3), 7 + (12 * 3), 9 + (12 * 3), 11 + (12 * 3), 0 + (12 * 4), 2 + (12 * 4), 4 + (12 * 4), 5 + (12 * 4), 7 + (12 * 4), 9 + (12 * 4), 11 + (12 * 4), } +/** + * @brief get the number of currently active tones + * @return number, 0=none active + */ +uint8_t audio_get_number_of_active_tones(void); -// These macros are used to allow play_notes to play an array of indeterminate -// length. This works around the limitation of C's sizeof operation on pointers. -// The global float array for the song must be used here. -#define NOTE_ARRAY_SIZE(x) ((int16_t)(sizeof(x) / (sizeof(x[0])))) -#define PLAY_SONG(note_array) play_notes(¬e_array, NOTE_ARRAY_SIZE((note_array)), false) -#define PLAY_LOOP(note_array) play_notes(¬e_array, NOTE_ARRAY_SIZE((note_array)), true) +/** + * @brief access to the raw/unprocessed frequency for a specific tone + * @details each active tone has a frequency associated with it, which + * the internal state keeps track of, and is usually influenced + * by various effects + * @param[in] tone_index, ranging from 0 to number_of_active_tones-1, with the + * first being the most recent and each increment yielding the next + * older one + * @return a positive frequency, in Hz; or zero if the tone is a pause + */ +float audio_get_frequency(uint8_t tone_index); + +/** + * @brief calculate and return the frequency for the requested tone + * @details effects like glissando, vibrato, ... are post-processed onto the + * each active tones 'base'-frequency; this function returns the + * post-processed result. + * @param[in] tone_index, ranging from 0 to number_of_active_tones-1, with the + * first being the most recent and each increment yielding the next + * older one + * @return a positive frequency, in Hz; or zero if the tone is a pause + */ +float audio_get_processed_frequency(uint8_t tone_index); + +/** + * @brief update audio internal state: currently playing and active tones,... + * @details This function is intended to be called by the audio-hardware + * specific implementation on a somewhat regular basis while a SONG + * or notes (pitch+duration) are playing to 'advance' the internal + * state (current playing notes, position in the melody, ...) + * + * @return true if something changed in the currently active tones, which the + * hardware might need to react to + */ +bool audio_update_state(void); + +// legacy and back-warts compatibility stuff + +#define is_audio_on() audio_is_on() +#define is_playing_notes() audio_is_playing_melody() +#define is_playing_note() audio_is_playing_note() +#define stop_all_notes() audio_stop_all() +#define stop_note(f) audio_stop_tone(f) +#define play_note(f, v) audio_play_tone(f) -bool is_playing_notes(void); +#define set_timbre(t) voice_set_timbre(t) +#define set_tempo(t) audio_set_tempo(t) +#define increase_tempo(t) audio_increase_tempo(t) +#define decrease_tempo(t) audio_decrease_tempo(t) +// vibrato functions are not used in any keyboards |