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#include <stdlib.h>
#include <portmidi.h>
#include <porttime.h>
#include <stdio.h>
#include <string.h>
#include <raylib.h>
#include <pthread.h>
#include <math.h>
#include "synth_common.h"
#define MIDI_NOTE_ON 0x90
#define MIDI_NOTE_OFF 0x80
#define MIDI_CHANNEL 0
#define SLEEP_INTERVAL_MS 2.0 // main loop sleep
//-------------------------------------------------
// Helper for time math
//-------------------------------------------------
typedef struct step_t {
PmTimestamp note_on;
PmTimestamp note_off;
float duration;
int note;
} step_t;
typedef struct pattert_t {
step_t *steps;
uint n; // total
uint c; // current
} pattern_t;
typedef struct sequencer_t {
PortMidiStream *stream;
int exitted;
float bpm;
int steps;
pattern_t *pattern;
} sequencer_t;
sequencer_t *
init_sequencer() {
sequencer_t *seq = (sequencer_t *)malloc(sizeof(sequencer_t));
seq->exitted = 0;
seq->bpm = 100.0f;
seq->steps = 16;
seq->pattern = (pattern_t *)malloc(sizeof(pattern_t));
seq->pattern->steps = (step_t *)malloc(16 * sizeof(step_t));
seq->pattern->n = 16;
seq->pattern->c = 0;
for (uint i = 0; i < seq->pattern->n; i++) {
step_t *step = &seq->pattern->steps[i];
step->note = 40 + i;
}
seq->stream = NULL;
PmError err = Pm_Initialize();
if (err != pmNoError) {
fprintf(stdout, "Pm Error: %s\n", Pm_GetErrorText(err));
}
const PmDeviceInfo *info;
int i;
for (i = 0; i < Pm_CountDevices(); i++) {
info = Pm_GetDeviceInfo(i);
if (!info->output) {
continue;
}
printf("%d: %s [input: %d output: %d opened: %d is_virt:%d] (interface: %s)\n", i, info->name, info->input, info->output, info->opened, info->is_virtual, info->interf);
if (0 == strcmp("Midi Through Port-0", info->name))
break;
}
printf("Selected device: %s [input: %d output: %d opened: %d is_virt:%d] (interf: %s)\n", info->name, info->input, info->output, info->opened, info->is_virtual, info->interf);
//no start for output Pt_Start(1, midiCallback, m);
err = Pm_OpenOutput(&(seq->stream), i, NULL, 512, NULL, NULL, 0);
if (err != pmNoError) {
fprintf(stdout, "Pm Error: %s\n", Pm_GetErrorText(err));
}
return seq;
}
void
free_sequencer(sequencer_t * seq) {
Pm_WriteShort(seq->stream, 0, Pm_Message(0xFC /* MIDI_STOP */, 0, 0));
Pm_Close(seq->stream);
Pm_Terminate();
free(seq);
}
static inline double ms_per_beat(sequencer_t * seq) {
return 60000.0 / seq->bpm;
}
static inline double ms_per_step(sequencer_t * seq) {
return ms_per_beat(seq) / seq->steps;
}
void
rayrun(sequencer_t * seq) {
(void)seq;
SetTraceLogLevel(LOG_ERROR);
InitWindow(WIDTH, HEIGHT, "Raylib sequencer");
SetTargetFPS(60);
while (!WindowShouldClose()) {
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(BLACK);
EndDrawing();
//----------------------------------------------------------------------------------
}
seq->exitted = 1;
CloseWindow();
}
void *
sequencer_thread(void *arg)
{
sequencer_t *seq = (sequencer_t *)arg;
while (!seq->exitted) {
//PmTimestamp current_time = Pt_Time();
step_t *step = &seq->pattern->steps[seq->pattern->c++];
if (seq->pattern->c >= seq->pattern->n) seq->pattern->c = 0;
Pm_WriteShort(seq->stream, 0, Pm_Message(MIDI_NOTE_ON | MIDI_CHANNEL, step->note, 100));
Pt_Sleep(ms_per_step(seq)*4);
Pm_WriteShort(seq->stream, 0, Pm_Message(MIDI_NOTE_OFF | MIDI_CHANNEL, step->note, 0));
//Pt_Sleep(SLEEP_INTERVAL_MS);
}
printf("[Sequencer] Stopping.\n");
return NULL;
}
int
main(void) {
sequencer_t * seq = init_sequencer();
pthread_t seq_thread;
// start sequencer thread
pthread_create(&seq_thread, NULL, sequencer_thread, seq);
// start gui
rayrun(seq);
pthread_join(seq_thread, NULL);
free_sequencer(seq);
return 0;
}
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