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refactor: split monolithic main.c into modular source files

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Co-authored-by: aider (deepseek/deepseek-reasoner) <aider@aider.chat>
This commit is contained in:
Loic Coenen
2026-05-08 21:03:10 +00:00
parent f1a92f1e95
commit 96295fdb4c
8 changed files with 423 additions and 336 deletions
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src/looper.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <jack/jack.h>
#include <jack/midiport.h>
#include <stdatomic.h>
#include <math.h>
#include "looper.h"
#include "channel.h"
#include "midi.h"
/* Global state (shared across files) */
struct channel_t channels[MAX_CHANNELS];
atomic_int channel_count = 0;
int next_channel_id = 1;
atomic_int cmd_add = 0;
atomic_int cmd_remove = 0;
jack_port_t *midi_control_port = NULL;
jack_port_t *midi_clock_port = NULL;
atomic_int control_key_active = 0;
/* ----------------------------------------------------------------
* process callback
* ---------------------------------------------------------------- */
int process_callback(jack_nframes_t nframes, void *arg)
{
(void)arg;
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 (!channels[c].active) continue;
jack_default_audio_sample_t *in = (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 != channels[c].prev_state) {
switch (state) {
case STATE_RECORD:
channels[c].record_pos = 0;
channels[c].loop_count = 0;
break;
case STATE_LOOPING:
if (channels[c].record_pos > 0)
channels[c].loop_count = channels[c].record_pos;
channels[c].playback_pos = 0;
break;
default:
break;
}
}
jack_nframes_t i;
switch (state) {
case STATE_RECORD:
if (in) {
for (i = 0; i < nframes; i++) {
if (channels[c].record_pos < LOOP_BUF_SIZE)
channels[c].loop_buffer[channels[c].record_pos++] = ((const float *)in)[i];
((float *)out)[i] = ((const float *)in)[i];
}
} else {
memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
}
break;
case STATE_LOOPING:
if (channels[c].loop_count > 0) {
float *outf = (float *)out;
for (i = 0; i < nframes; i++) {
outf[i] = channels[c].loop_buffer[channels[c].playback_pos];
channels[c].playback_pos = (channels[c].playback_pos + 1) % channels[c].loop_count;
}
} 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;
}
channels[c].prev_state = state;
}
/* MIDI clock events – affect channel 0 only */
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)
{
/* channel 0 */
channels[0].active = 1;
atomic_store(&channels[0].state, STATE_IDLE);
channels[0].prev_state = -1;
channels[0].loop_count = 0;
channels[0].record_pos = 0;
channels[0].playback_pos = 0;
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;
}
/* ----------------------------------------------------------------
* main‑loop command processing
* ---------------------------------------------------------------- */
void looper_process_commands(jack_client_t *client)
{
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);
}
}
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) {
channel_remove(client, remove_idx);
}
}
}