123 lines
4.3 KiB
C
123 lines
4.3 KiB
C
/* Copyright 2020 Rodolphe Belouin
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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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#pragma once
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#include <stdbool.h>
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#include "debug.h"
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#include "timer.h"
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// Maximum number of steps: 256
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#ifndef SEQUENCER_STEPS
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# define SEQUENCER_STEPS 16
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#endif
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// Maximum number of tracks: 8
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#ifndef SEQUENCER_TRACKS
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# define SEQUENCER_TRACKS 8
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#endif
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#ifndef SEQUENCER_TRACK_THROTTLE
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# define SEQUENCER_TRACK_THROTTLE 3
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#endif
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#ifndef SEQUENCER_PHASE_RELEASE_TIMEOUT
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# define SEQUENCER_PHASE_RELEASE_TIMEOUT 30
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#endif
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/**
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* Make sure that the items of this enumeration follow the powers of 2, separated by a ternary variant.
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* Check the implementation of `get_step_duration` for further explanation.
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*/
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typedef enum { SQ_RES_2, SQ_RES_2T, SQ_RES_4, SQ_RES_4T, SQ_RES_8, SQ_RES_8T, SQ_RES_16, SQ_RES_16T, SQ_RES_32, SEQUENCER_RESOLUTIONS } sequencer_resolution_t;
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typedef struct {
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bool enabled;
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uint8_t steps[SEQUENCER_STEPS];
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uint16_t track_notes[SEQUENCER_TRACKS];
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uint8_t tempo; // Is a maximum tempo of 255 reasonable?
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sequencer_resolution_t resolution;
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} sequencer_config_t;
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/**
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* Because Digital Audio Workstations get overwhelmed when too many MIDI signals are sent concurrently,
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* We use a "phase" state machine to delay some of the events.
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*/
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typedef enum sequencer_phase_t {
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SEQUENCER_PHASE_ATTACK, // t=0ms, send the MIDI note on signal
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SEQUENCER_PHASE_RELEASE, // t=SEQUENCER_PHASE_RELEASE_TIMEOUT ms, send the MIDI note off signal
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SEQUENCER_PHASE_PAUSE // t=step duration ms, loop
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} sequencer_phase_t;
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typedef struct {
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uint8_t active_tracks;
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uint8_t current_track;
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uint8_t current_step;
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uint16_t timer;
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sequencer_phase_t phase;
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} sequencer_state_t;
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extern sequencer_config_t sequencer_config;
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// We expose the internal state to make the feature more "unit-testable"
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extern sequencer_state_t sequencer_internal_state;
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bool is_sequencer_on(void);
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void sequencer_toggle(void);
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void sequencer_on(void);
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void sequencer_off(void);
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void sequencer_set_track_notes(const uint16_t track_notes[SEQUENCER_TRACKS]);
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bool is_sequencer_track_active(uint8_t track);
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void sequencer_set_track_activation(uint8_t track, bool value);
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void sequencer_toggle_track_activation(uint8_t track);
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void sequencer_toggle_single_active_track(uint8_t track);
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#define sequencer_activate_track(track) sequencer_set_track_activation(track, true)
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#define sequencer_deactivate_track(track) sequencer_set_track_activation(track, false)
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bool is_sequencer_step_on(uint8_t step);
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bool is_sequencer_step_on_for_track(uint8_t step, uint8_t track);
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void sequencer_set_step(uint8_t step, bool value);
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void sequencer_toggle_step(uint8_t step);
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void sequencer_set_all_steps(bool value);
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#define sequencer_set_step_on(step) sequencer_set_step(step, true)
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#define sequencer_set_step_off(step) sequencer_set_step(step, false)
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#define sequencer_set_all_steps_on() sequencer_set_all_steps(true)
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#define sequencer_set_all_steps_off() sequencer_set_all_steps(false)
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uint8_t sequencer_get_tempo(void);
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void sequencer_set_tempo(uint8_t tempo);
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void sequencer_increase_tempo(void);
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void sequencer_decrease_tempo(void);
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sequencer_resolution_t sequencer_get_resolution(void);
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void sequencer_set_resolution(sequencer_resolution_t resolution);
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void sequencer_increase_resolution(void);
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void sequencer_decrease_resolution(void);
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uint8_t sequencer_get_current_step(void);
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uint16_t sequencer_get_beat_duration(void);
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uint16_t sequencer_get_step_duration(void);
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uint16_t get_beat_duration(uint8_t tempo);
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uint16_t get_step_duration(uint8_t tempo, sequencer_resolution_t resolution);
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void sequencer_task(void);
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