Merge branch '3-integrate-carla'

This commit is contained in:
Loic Coenen
2026-05-17 19:39:54 +00:00
42 changed files with 2716 additions and 340 deletions

675
engine/src/looper.c~ Normal file
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// cppcheck-suppress missingIncludeSystem
#include "looper.h"
#include "channel.h"
#include "midi.h"
<<<<<<< HEAD
#include "wav.h"
#include "ringbuffer.h"
#include "pipe.h"
#include <jack/jack.h>
#include <sys/stat.h>
=======
#include "queue.h"
>>>>>>> 3-integrate-carla
#include <fcntl.h>
#include <jack/jack.h>
#include <jack/midiport.h>
#include <math.h>
#include <pthread.h>
#include <stdatomic.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
<<<<<<< HEAD
#include <time.h>
#include "queue.h"
#include "command.h"
/* Global command queues */
spsc_queue_t cmd_queue;
spsc_queue_t cmd_queue_main_midi;
spsc_queue_t cmd_queue_main_fifo;
=======
#include <sys/stat.h>
#include <unistd.h>
>>>>>>> 3-integrate-carla
#define STATUS_FIFO "/tmp/looper_status"
/* writer status fd */
static int status_fd = -1;
static void looper_write_status(void) {
<<<<<<< HEAD
if (status_fd < 0)
return;
char buf[256];
for (int ch = 0; ch < MAX_CHANNELS; ch++) {
if (!atomic_load(&channels[ch].active))
continue;
int state_val = atomic_load(&channels[ch].state);
const char *state_str;
switch (state_val) {
case STATE_IDLE: state_str = "IDLE"; break;
case STATE_RECORD: state_str = "RECORD"; break;
case STATE_LOOPING: state_str = "LOOPING"; break;
case STATE_PAUSED: state_str = "PAUSED"; break;
default: state_str = "UNKNOWN";
}
int n = snprintf(buf, sizeof(buf),
"CH=%d SC=%d STATE=%s\n",
ch, 0, state_str);
if (n > 0) {
int ret = write(status_fd, buf, n);
(void)ret;
}
}
=======
int fd = open(STATUS_FIFO, O_WRONLY | O_NONBLOCK);
if (fd < 0)
return;
struct channel_t *cur = get_channels_array();
int cap = atomic_load(&channel_capacity);
char buf[256];
for (int ch = 0; ch < cap; ch++) {
if (!atomic_load(&cur[ch].active))
continue;
int sc_idx = atomic_load(&cur[ch].current_scene);
int state = atomic_load(&cur[ch].scenes[sc_idx].state);
const char *state_str;
switch (state) {
case STATE_IDLE:
state_str = "IDLE";
break;
case STATE_RECORD:
state_str = "RECORD";
break;
case STATE_LOOPING:
state_str = "LOOPING";
break;
case STATE_PAUSED:
state_str = "PAUSED";
break;
default:
state_str = "UNKNOWN";
}
int n = snprintf(buf, sizeof(buf), "CH=%d SC=%d STATE=%s\n", ch, sc_idx,
state_str);
if (n > 0) {
int ret = write(fd, buf, n);
(void)ret;
}
}
close(fd);
>>>>>>> 3-integrate-carla
}
/* Global state (shared across files) */
struct channel_t channels[MAX_CHANNELS];
atomic_int channel_count = 0;
atomic_int channel_capacity = MAX_CHANNELS;
int next_channel_id = 1;
atomic_int cmd_add = 0;
atomic_int cmd_remove = 0;
atomic_int cmd_load = 0;
atomic_int cmd_save = 0;
jack_port_t *midi_control_port = NULL;
jack_port_t *midi_clock_port = NULL;
atomic_int control_key_active = 0;
atomic_int bind_channel = 0;
/* Deferred removal index (1 second grace) */
static int pending_unregister_idx = -1;
/* writer thread function and sample rate holder */
static void *writer_thread(void *arg);
static int global_sample_rate = 0;
/* execute a single command (called from looper_process_commands) */
static void exec_command(command_t cmd, jack_client_t *client) {
int ch = cmd.channel;
if (ch < 0) ch = 0;
switch (cmd.type) {
case CMD_CYCLE: {
int state = atomic_load(&channels[ch].state);
switch (state) {
case STATE_IDLE:
atomic_store(&channels[ch].state, STATE_RECORD);
break;
case STATE_RECORD:
atomic_store(&channels[ch].state, STATE_LOOPING);
break;
case STATE_LOOPING:
atomic_store(&channels[ch].state, STATE_PAUSED);
break;
case STATE_PAUSED:
atomic_store(&channels[ch].state, STATE_LOOPING);
break;
}
atomic_store(&channels[ch].prev_state, -1);
break;
}
case CMD_STOP:
atomic_store(&channels[ch].state, STATE_IDLE);
atomic_store(&channels[ch].prev_state, -1);
break;
case CMD_ADD_CHANNEL:
case CMD_ADD_MIDI_CHANNEL: {
int idx;
for (idx = 0; idx < MAX_CHANNELS; idx++)
if (!channels[idx].active)
break;
if (idx < MAX_CHANNELS)
channel_add(client, idx);
break;
}
case CMD_REMOVE_CHANNEL: {
int remove_idx = -1;
for (int idx = 1; idx < MAX_CHANNELS; idx++)
if (channels[idx].active)
remove_idx = idx;
if (remove_idx != -1) {
channel_remove(client, remove_idx);
pending_unregister_idx = remove_idx;
}
break;
}
case CMD_BIND_CHANNEL:
atomic_store(&bind_channel, cmd.data);
break;
case CMD_UNBIND:
atomic_store(&bind_channel, 0);
break;
case CMD_LOAD:
atomic_store(&cmd_load, 1);
break;
case CMD_SAVE:
atomic_store(&cmd_save, 1);
break;
case CMD_ADD_SCENE:
case CMD_REMOVE_SCENE:
case CMD_NEXT_SCENE:
case CMD_PREV_SCENE:
break;
default:
break;
}
}
/* ----------------------------------------------------------------
* process callback
* ---------------------------------------------------------------- */
int process_callback(jack_nframes_t nframes, void *arg) {
(void)arg;
if (midi_control_port) {
void *midi_ctrl_buf = jack_port_get_buffer(midi_control_port, nframes);
if (midi_ctrl_buf) {
midi_handle_events(midi_ctrl_buf, nframes);
}
}
/* process each active channel */
for (int c = 0; c < MAX_CHANNELS; c++) {
if (!atomic_load(&channels[c].active))
continue;
/* Guard against NULL ports (e.g. if port registration failed) */
if (!channels[c].audio_in || !channels[c].audio_out) {
fprintf(stderr, "WARN: channel %d has NULL audio port(s), skipping\n", c);
continue;
}
const jack_default_audio_sample_t *in =
(const jack_default_audio_sample_t *)jack_port_get_buffer(
channels[c].audio_in, nframes);
jack_default_audio_sample_t *out =
(jack_default_audio_sample_t *)jack_port_get_buffer(
channels[c].audio_out, nframes);
if (!out)
continue;
int state = atomic_load(&channels[c].state);
if (state != atomic_load(&channels[c].prev_state)) {
switch (state) {
case STATE_RECORD:
atomic_store(&channels[c].record_pos, 0);
atomic_store(&channels[c].loop_count, 0);
break;
case STATE_LOOPING:
if (atomic_load(&channels[c].prev_state) == STATE_RECORD &&
atomic_load(&channels[c].record_pos) > 0)
atomic_store(&channels[c].loop_count,
atomic_load(&channels[c].record_pos));
atomic_store(&channels[c].playback_pos, 0);
break;
default:
break;
}
}
<<<<<<< HEAD
jack_nframes_t i;
switch (state) {
case STATE_RECORD:
if (in) {
float *f_out = (float *)out;
const float *f_in = (const float *)in;
for (i = 0; i < nframes; i++) {
int rp = atomic_fetch_add(&channels[c].record_pos, 1);
if (rp < LOOP_BUF_SIZE)
channels[c].loop_buffer[rp] = f_in[i];
f_out[i] = f_in[i];
}
} else {
=======
if (active_channels[c].type == CHANNEL_MIDI) {
/* MIDI channel handling */
switch (state) {
case STATE_RECORD: {
void *midi_in_buf =
jack_port_get_buffer(active_channels[c].midi_in, nframes);
if (midi_in_buf) {
jack_nframes_t nevents = jack_midi_get_event_count(midi_in_buf);
jack_midi_event_t ev;
for (jack_nframes_t j = 0; j < nevents; j++) {
if (jack_midi_event_get(&ev, midi_in_buf, j) != 0)
continue;
int rp = atomic_load(&sc->record_pos);
if (rp < MAX_MIDI_EVENTS) {
sc->loop.midi_events[rp].timestamp = ev.time;
sc->loop.midi_events[rp].status = ev.buffer[0];
sc->loop.midi_events[rp].note = (ev.size > 1) ? ev.buffer[1] : 0;
sc->loop.midi_events[rp].velocity =
(ev.size > 2) ? ev.buffer[2] : 0;
atomic_store(&sc->record_pos, rp + 1);
}
}
/* forward incoming MIDI to output during record */
void *midi_out_buf =
jack_port_get_buffer(active_channels[c].midi_out, nframes);
if (midi_out_buf) {
jack_midi_clear_buffer(midi_out_buf);
for (jack_nframes_t j = 0; j < nevents; j++) {
if (jack_midi_event_get(&ev, midi_in_buf, j) != 0)
continue;
jack_midi_event_write(midi_out_buf, ev.time, ev.buffer, ev.size);
}
}
}
break;
}
case STATE_LOOPING: {
void *midi_out_buf =
jack_port_get_buffer(active_channels[c].midi_out, nframes);
if (midi_out_buf) {
jack_midi_clear_buffer(midi_out_buf);
int cnt = atomic_load(&sc->loop_count);
if (cnt > 0) {
for (int e = 0; e < cnt; e++) {
unsigned char msg[3];
msg[0] = sc->loop.midi_events[e].status;
msg[1] = sc->loop.midi_events[e].note;
msg[2] = sc->loop.midi_events[e].velocity;
jack_midi_event_write(midi_out_buf, 0, msg, 3);
}
}
}
break;
}
case STATE_PAUSED:
/* no output */
break;
default: /* IDLE */
{
void *midi_in_buf =
jack_port_get_buffer(active_channels[c].midi_in, nframes);
void *midi_out_buf =
jack_port_get_buffer(active_channels[c].midi_out, nframes);
if (midi_in_buf && midi_out_buf) {
jack_midi_clear_buffer(midi_out_buf);
jack_nframes_t nevents = jack_midi_get_event_count(midi_in_buf);
jack_midi_event_t ev;
for (jack_nframes_t j = 0; j < nevents; j++) {
if (jack_midi_event_get(&ev, midi_in_buf, j) != 0)
continue;
jack_midi_event_write(midi_out_buf, ev.time, ev.buffer, ev.size);
}
}
} break;
}
if (state == STATE_LOOPING) {
atomic_store(&sc->loop_count, atomic_load(&sc->record_pos));
}
} else {
/* audio channel handling */
jack_nframes_t i;
switch (state) {
case STATE_RECORD:
if (in) {
float *f_out = (float *)out;
const float *f_in = (const float *)in;
for (i = 0; i < nframes; i++) {
int rp = atomic_load(&sc->record_pos);
if (rp < LOOP_BUF_SIZE) {
sc->loop.audio_buffer[rp] = f_in[i];
atomic_store(&sc->record_pos, rp + 1);
}
f_out[i] = f_in[i];
}
} else {
memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
}
break;
case STATE_LOOPING: {
int loop_cnt = atomic_load(&sc->loop_count);
if (loop_cnt > 0) {
float *outf = (float *)out;
int pp = atomic_load(&sc->playback_pos);
for (i = 0; i < nframes; i++) {
outf[i] = sc->loop.audio_buffer[pp];
pp = (pp + 1) % loop_cnt;
}
atomic_store(&sc->playback_pos, pp);
} else {
memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
}
break;
}
case STATE_PAUSED:
>>>>>>> 3-integrate-carla
memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
}
break;
case STATE_LOOPING:
int lc = atomic_load(&channels[c].loop_count);
if (lc > 0) {
float *outf = (float *)out;
for (i = 0; i < nframes; i++) {
int pp = atomic_load(&channels[c].playback_pos);
outf[i] = channels[c].loop_buffer[pp];
atomic_store(&channels[c].playback_pos, (pp + 1) % lc);
}
} else {
memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
}
break;
case STATE_PAUSED:
memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
break;
default: /* IDLE */
if (in) {
memcpy(out, in, sizeof(jack_default_audio_sample_t) * nframes);
} else {
memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
}
break;
}
// push loop output into save ring if saving (atomic load)
RingBuf *r = (RingBuf *)atomic_load_explicit(&channels[c].save_ring,
memory_order_acquire);
if (r != NULL) {
if (state == STATE_LOOPING && atomic_load(&channels[c].loop_count) > 0) {
const float *outf = (const float *)out;
ring_write(r, outf, nframes);
}
}
atomic_store(&channels[c].prev_state, state);
}
/* MIDI clock events affect channel 0 only */
if (midi_clock_port) {
void *midi_clock_buf = jack_port_get_buffer(midi_clock_port, nframes);
if (midi_clock_buf) {
jack_nframes_t n_clock_events = jack_midi_get_event_count(midi_clock_buf);
jack_midi_event_t cev;
for (jack_nframes_t j = 0; j < n_clock_events; j++) {
if (jack_midi_event_get(&cev, midi_clock_buf, j) != 0)
continue;
if (cev.size >= 1) {
unsigned char msg = cev.buffer[0];
switch (msg) {
case 0xFA: {
int s = atomic_load(&channels[0].state);
if (s == STATE_IDLE)
atomic_store(&channels[0].state, STATE_RECORD);
break;
}
case 0xFC:
atomic_store(&channels[0].state, STATE_IDLE);
break;
case 0xFB: {
int s = atomic_load(&channels[0].state);
if (s == STATE_PAUSED)
atomic_store(&channels[0].state, STATE_LOOPING);
break;
}
default:
break;
}
}
}
}
}
return 0;
}
/* ----------------------------------------------------------------
* shutdown callback
* ---------------------------------------------------------------- */
void jack_shutdown_cb(void *arg) {
(void)arg;
fprintf(stderr, "JACK shutdown\n");
exit(0);
}
/* ----------------------------------------------------------------
* looper initialisation
* ---------------------------------------------------------------- */
int looper_init(jack_client_t *client) {
/* store sample rate for writer thread */
global_sample_rate = jack_get_sample_rate(client);
/* create status FIFO (ignore if already exists) */
mkfifo(STATUS_FIFO, 0666);
/* open the status FIFO for reading+writing so writes work even without reader */
status_fd = open(STATUS_FIFO, O_RDWR);
if (status_fd < 0) {
perror("open status FIFO");
}
queue_init(&cmd_queue);
queue_init(&cmd_queue_main_midi);
queue_init(&cmd_queue_main_fifo);
/* start the FIFO reader thread */
pipe_start_reader();
/* channel 0 */
channels[0].active = 1;
atomic_store(&channels[0].state, STATE_IDLE);
atomic_store(&channels[0].prev_state, -1);
channels[0].loop_count = 0;
atomic_store(&channels[0].record_pos, 0);
atomic_store(&channels[0].playback_pos, 0);
atomic_store_explicit(&channels[0].save_ring, NULL, memory_order_release);
channels[0].audio_in = jack_port_register(
client, "input", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
channels[0].audio_out = jack_port_register(
client, "output", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
if (!channels[0].audio_in || !channels[0].audio_out) {
fprintf(stderr, "Could not create audio ports for channel 0\n");
return -1;
}
channel_count = 1;
midi_control_port = jack_port_register(
client, "control", JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0);
midi_clock_port = jack_port_register(client, "clock", JACK_DEFAULT_MIDI_TYPE,
JackPortIsInput, 0);
if (!midi_control_port || !midi_clock_port) {
fprintf(stderr, "Could not create MIDI ports\n");
return -1;
}
return 0;
}
/* ----------------------------------------------------------------
* writer thread consumes the save ring and writes WAV file
* ---------------------------------------------------------------- */
static void *writer_thread(void *arg) {
struct channel_t *ch = (struct channel_t *)arg;
RingBuf *ring = (RingBuf *)ch->save_ring;
if (!ring)
return NULL;
static const char *path = "save.wav";
unsigned sr = (unsigned)global_sample_rate;
if (sr == 0)
sr = 48000;
int lc = atomic_load(&ch->loop_count);
float *outbuf = malloc((size_t)lc * sizeof(float));
if (!outbuf) {
ring_destroy(ring);
free(ring);
ch->save_ring = NULL;
return NULL;
}
size_t collected = 0;
size_t want = (size_t)lc;
while (collected < want) {
size_t got = ring_read(ring, outbuf + collected, want - collected);
collected += got;
if (got == 0) {
struct timespec req = {.tv_sec = 0, .tv_nsec = 10000000};
nanosleep(&req, NULL);
}
}
wav_write(path, outbuf, (unsigned)lc, sr);
free(outbuf);
ring_destroy(ring);
free(ring);
atomic_store_explicit(&ch->save_ring, NULL, memory_order_release);
return NULL;
}
/* ----------------------------------------------------------------
* mainloop command processing
* ---------------------------------------------------------------- */
void looper_process_commands(jack_client_t *client) {
/* process commands from the three queues FIRST */
command_t cmd;
while (queue_pop(&cmd_queue, &cmd))
exec_command(cmd, client);
while (queue_pop(&cmd_queue_main_midi, &cmd))
exec_command(cmd, client);
while (queue_pop(&cmd_queue_main_fifo, &cmd))
exec_command(cmd, client);
/* Unregister any ports that were marked for deferred removal.
By now the realtime thread has had at least one full cycle
to see the `active = 0` store. */
if (pending_unregister_idx != -1) {
int idx = pending_unregister_idx;
if (channels[idx].audio_in)
jack_port_unregister(client, channels[idx].audio_in);
if (channels[idx].audio_out)
jack_port_unregister(client, channels[idx].audio_out);
pending_unregister_idx = -1;
}
/* ---------- add channel ---------- */
if (atomic_exchange(&cmd_add, 0)) {
int idx;
for (idx = 0; idx < MAX_CHANNELS; idx++)
if (!channels[idx].active)
break;
if (idx < MAX_CHANNELS) {
channel_add(client, idx);
}
}
/* ---------- remove channel ---------- */
if (atomic_exchange(&cmd_remove, 0)) {
int remove_idx = -1;
for (int idx = 1; idx < MAX_CHANNELS; idx++)
if (channels[idx].active)
remove_idx = idx;
if (remove_idx != -1) {
/* Mark inactive now; ports will be unregistered next round */
channel_remove(client, remove_idx);
pending_unregister_idx = remove_idx;
}
}
/* ---------- load command ---------- */
if (atomic_exchange(&cmd_load, 0)) {
float *buf = NULL;
unsigned frames = 0;
printf("LOAD: wav_read called\n");
if (wav_read("loop.wav", &buf, &frames) == 0 && frames > 0) {
printf("LOAD: success, frames=%u\n", frames);
if (frames > LOOP_BUF_SIZE)
frames = LOOP_BUF_SIZE;
memcpy(channels[0].loop_buffer, buf, frames * sizeof(float));
atomic_store(&channels[0].loop_count, (int)frames);
atomic_store(&channels[0].record_pos, 0);
atomic_store(&channels[0].playback_pos, 0);
atomic_store(&channels[0].state, STATE_LOOPING);
atomic_store(&channels[0].prev_state, -1);
free(buf);
} else {
fprintf(stderr, "Failed to load loop.wav\n");
printf("LOAD: FAILED\n");
}
}
/* ---------- save command (writer thread) ---------- */
if (atomic_exchange(&cmd_save, 0)) {
int lc = atomic_load(&channels[0].loop_count);
if (atomic_load(&channels[0].state) == STATE_LOOPING && lc > 0 &&
channels[0].save_ring == NULL) {
RingBuf *ring = (RingBuf *)malloc(sizeof(RingBuf));
if (ring) {
size_t sz = (size_t)lc * 2;
if (ring_init(ring, sz) == 0) {
atomic_store_explicit(&channels[0].save_ring, (_Atomic RingBuf *)ring,
memory_order_release);
pthread_t th;
pthread_create(&th, NULL, writer_thread, &channels[0]);
pthread_detach(th);
} else {
free(ring);
}
}
}
}
/* write current state to status FIFO */
looper_write_status();
}