#include <pbl/kernel/compiler.h>
#include <stdbool.h>
#include <stdint.h>

Data Structures
struct	SpeakerNote
	A single note in a sequence. More...

struct	NoteSequenceState
	Playback state of a note sequence. More...

Enumerations
enum	SpeakerWaveform { SpeakerWaveformSine = 0 , SpeakerWaveformSquare , SpeakerWaveformTriangle , SpeakerWaveformSawtooth , SpeakerWaveformCount }
	Waveform used to synthesize a note. More...

Functions
void	note_seq_init (NoteSequenceState s, const SpeakerNote notes, uint32_t count, uint32_t sample_rate)
	Initialize a note sequence player.

uint32_t	note_seq_fill (NoteSequenceState s, int16_t out, uint32_t max_samples)
	Fill an output buffer with synthesized PCM samples.

void	note_seq_deinit (NoteSequenceState *s)
	Clean up note sequence state.

uint32_t	note_phase_inc (uint8_t midi_note, uint32_t sample_rate)
	Compute the per-sample phase increment of a MIDI note.

int16_t	note_synth_sample (uint8_t waveform, uint32_t phase_acc, uint32_t phase_inc, uint8_t velocity)
	Synthesize one PCM sample of a waveform.

uint32_t	note_midi_freq_x256 (uint8_t midi_note)
	Get the frequency of a MIDI note.

Data Structure Documentation

◆ SpeakerNote

struct SpeakerNote

A single note in a sequence.

Data Fields
uint16_t	duration_ms	Note duration in ms (max 10000).
uint8_t	midi_note	MIDI note number (0-127, 60=C4). 0 = rest (silence).
uint8_t	reserved	Reserved, set to 0.
uint8_t	velocity	Volume 0-127 (0 = use global volume).
uint8_t	waveform	SpeakerWaveform value.

Waveform used to synthesize a note.