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feat: implement scene infrastructure for multi-scene looper support

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Co-authored-by: aider (deepseek/deepseek-reasoner) <aider@aider.chat>
This commit is contained in:
Loic Coenen
2026-05-10 18:00:32 +00:00
parent 44177f785f
commit 7b00246443
6 changed files with 254 additions and 78 deletions
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67
src/channel.c
View File

@@ -5,6 +5,13 @@
#include <stdio.h>
#include <string.h>
/* Helper: zero a scene and set its state to IDLE */
static void init_scene(scene_t *sc) {
memset(sc, 0, sizeof(scene_t));
atomic_store(&sc->state, STATE_IDLE);
sc->prev_state = -1;
}
void channel_add(jack_client_t *client, int idx) {
struct channel_t *cur = get_channels_array();
@@ -24,12 +31,10 @@ void channel_add(jack_client_t *client, int idx) {
}
atomic_store(&cur[idx].active, 1);
atomic_store(&cur[idx].state, STATE_IDLE);
cur[idx].prev_state = -1;
cur[idx].loop_count = 0;
cur[idx].record_pos = 0;
cur[idx].playback_pos = 0;
cur[idx].type = CHANNEL_AUDIO;
cur[idx].scene_count = 1;
cur[idx].current_scene = 0;
init_scene(&cur[idx].scenes[0]);
next_channel_id++;
atomic_fetch_add(&channel_count, 1);
@@ -54,12 +59,10 @@ void channel_add_midi(jack_client_t *client, int idx) {
}
atomic_store(&cur[idx].active, 1);
atomic_store(&cur[idx].state, STATE_IDLE);
cur[idx].prev_state = -1;
cur[idx].loop_count = 0;
cur[idx].record_pos = 0;
cur[idx].playback_pos = 0;
cur[idx].type = CHANNEL_MIDI;
cur[idx].scene_count = 1;
cur[idx].current_scene = 0;
init_scene(&cur[idx].scenes[0]);
next_channel_id++;
atomic_fetch_add(&channel_count, 1);
@@ -71,3 +74,47 @@ void channel_remove(jack_client_t *client, int idx) {
atomic_store(&cur[idx].active, 0);
atomic_fetch_sub(&channel_count, 1);
}
void channel_add_scene(jack_client_t *client, int idx) {
(void)client;
struct channel_t *cur = get_channels_array();
if (cur[idx].scene_count >= MAX_SCENES)
return;
int ns = cur[idx].scene_count;
init_scene(&cur[idx].scenes[ns]);
cur[idx].scene_count++;
}
void channel_remove_scene(jack_client_t *client, int idx) {
(void)client;
struct channel_t *cur = get_channels_array();
if (cur[idx].scene_count <= 1)
return;
int cs = cur[idx].current_scene;
/* shift remaining scenes down */
for (int i = cs; i < cur[idx].scene_count - 1; i++) {
cur[idx].scenes[i] = cur[idx].scenes[i + 1];
}
cur[idx].scene_count--;
if (cur[idx].current_scene >= cur[idx].scene_count)
cur[idx].current_scene = cur[idx].scene_count - 1;
}
void channel_next_scene(jack_client_t *client, int idx) {
(void)client;
struct channel_t *cur = get_channels_array();
if (cur[idx].scene_count > 1) {
cur[idx].current_scene =
(cur[idx].current_scene + 1) % cur[idx].scene_count;
}
}
void channel_prev_scene(jack_client_t *client, int idx) {
(void)client;
struct channel_t *cur = get_channels_array();
if (cur[idx].scene_count > 1) {
cur[idx].current_scene =
(cur[idx].current_scene - 1 + cur[idx].scene_count) %
cur[idx].scene_count;
}
}

29
src/channel.h
View File

@@ -9,6 +9,8 @@
#define MAX_MIDI_EVENTS 1024
#define MAX_SCENES 16
typedef enum {
CHANNEL_AUDIO,
CHANNEL_MIDI
@@ -28,23 +30,28 @@ typedef enum {
STATE_PAUSED
} looper_state;
struct channel_t {
channel_type_t type; /* CHANNEL_AUDIO or CHANNEL_MIDI */
atomic_int state;
int prev_state;
typedef struct {
union {
float audio_buffer[LOOP_BUF_SIZE];
midi_event_t midi_events[MAX_MIDI_EVENTS];
} loop;
int loop_count; /* for audio: length in samples; for MIDI: number of recorded events */
int record_pos; /* for audio: sample index; for MIDI: next event index for recording */
int playback_pos; /* for audio: sample index; for MIDI: next event index for playback */
int loop_count;
int record_pos;
int playback_pos;
atomic_int state;
int prev_state;
} scene_t;
struct channel_t {
channel_type_t type;
atomic_int active;
jack_port_t *audio_in;
jack_port_t *audio_out;
jack_port_t *midi_in;
jack_port_t *midi_out;
scene_t scenes[MAX_SCENES];
int scene_count;
int current_scene;
};
/* Globals declared in looper.c */
@@ -62,4 +69,10 @@ void channel_add(jack_client_t *client, int idx);
void channel_remove(jack_client_t *client, int idx);
void channel_add_midi(jack_client_t *client, int idx);
/* Scene management (called from main loop) */
void channel_add_scene(jack_client_t *client, int idx);
void channel_remove_scene(jack_client_t *client, int idx);
void channel_next_scene(jack_client_t *client, int idx);
void channel_prev_scene(jack_client_t *client, int idx);
#endif

8
src/command.h
View File

@@ -2,13 +2,17 @@
#define COMMAND_H
typedef enum {
CMD_CYCLE, // toggle record/stop for a channel
CMD_STOP, // force to idle
CMD_CYCLE, // toggle record/stop for the current scene of a channel
CMD_STOP, // force to idle for all scenes
CMD_BIND_CHANNEL, // bind a channel index (data = channel)
CMD_UNBIND, // reset bind to channel 0
CMD_ADD_CHANNEL, // add a new dynamic channel
CMD_REMOVE_CHANNEL, // remove last dynamic channel
CMD_ADD_MIDI_CHANNEL, // add a new dynamic MIDI channel
CMD_NEXT_SCENE,
CMD_PREV_SCENE,
CMD_ADD_SCENE,
CMD_REMOVE_SCENE,
} cmd_type_t;
typedef struct {

196
src/looper.c
View File

@@ -66,7 +66,9 @@ static void apply_command(command_t cmd) {
switch (cmd.type) {
case CMD_CYCLE:
if (cmd.channel >= 0 && cmd.channel < cap) {
int cst = atomic_load(&cur[cmd.channel].state);
int sc_idx = cur[cmd.channel].current_scene;
scene_t *sc = &cur[cmd.channel].scenes[sc_idx];
int cst = atomic_load(&sc->state);
int next;
switch (cst) {
case STATE_IDLE:
@@ -85,23 +87,29 @@ static void apply_command(command_t cmd) {
next = STATE_IDLE;
break;
}
atomic_store(&cur[cmd.channel].state, next);
atomic_store(&sc->state, next);
}
break;
case CMD_STOP:
if (cmd.channel >= 0 && cmd.channel < cap) {
atomic_store(&cur[cmd.channel].state, STATE_IDLE);
cur[cmd.channel].loop_count = 0;
cur[cmd.channel].record_pos = 0;
cur[cmd.channel].playback_pos = 0;
cur[cmd.channel].prev_state = -1;
struct channel_t *ch = &cur[cmd.channel];
for (int s = 0; s < ch->scene_count; s++) {
atomic_store(&ch->scenes[s].state, STATE_IDLE);
ch->scenes[s].loop_count = 0;
ch->scenes[s].record_pos = 0;
ch->scenes[s].playback_pos = 0;
ch->scenes[s].prev_state = -1;
}
} else {
for (int i = 0; i < cap; i++) {
atomic_store(&cur[i].state, STATE_IDLE);
cur[i].loop_count = 0;
cur[i].record_pos = 0;
cur[i].playback_pos = 0;
cur[i].prev_state = -1;
struct channel_t *ch = &cur[i];
for (int s = 0; s < ch->scene_count; s++) {
atomic_store(&ch->scenes[s].state, STATE_IDLE);
ch->scenes[s].loop_count = 0;
ch->scenes[s].record_pos = 0;
ch->scenes[s].playback_pos = 0;
ch->scenes[s].prev_state = -1;
}
}
}
break;
@@ -158,6 +166,10 @@ int process_callback(jack_nframes_t nframes, void *arg) {
}
}
/* Obtain current scene pointer */
int sc_idx = active_channels[c].current_scene;
scene_t *sc = &active_channels[c].scenes[sc_idx];
const jack_default_audio_sample_t *in =
(const jack_default_audio_sample_t *)jack_port_get_buffer(
active_channels[c].audio_in, nframes);
@@ -167,18 +179,18 @@ int process_callback(jack_nframes_t nframes, void *arg) {
if (!out)
continue;
int state = atomic_load(&active_channels[c].state);
int state = atomic_load(&sc->state);
if (state != active_channels[c].prev_state) {
if (state != sc->prev_state) {
switch (state) {
case STATE_RECORD:
active_channels[c].record_pos = 0;
active_channels[c].loop_count = 0;
sc->record_pos = 0;
sc->loop_count = 0;
break;
case STATE_LOOPING:
if (active_channels[c].record_pos > 0)
active_channels[c].loop_count = active_channels[c].record_pos;
active_channels[c].playback_pos = 0;
if (sc->record_pos > 0)
sc->loop_count = sc->record_pos;
sc->playback_pos = 0;
break;
default:
break;
@@ -197,20 +209,14 @@ int process_callback(jack_nframes_t nframes, void *arg) {
for (jack_nframes_t j = 0; j < nevents; j++) {
if (jack_midi_event_get(&ev, midi_in_buf, j) != 0)
continue;
if (active_channels[c].record_pos < MAX_MIDI_EVENTS) {
active_channels[c]
.loop.midi_events[active_channels[c].record_pos]
.timestamp = ev.time;
active_channels[c]
.loop.midi_events[active_channels[c].record_pos]
.status = ev.buffer[0];
active_channels[c]
.loop.midi_events[active_channels[c].record_pos]
.note = (ev.size > 1) ? ev.buffer[1] : 0;
active_channels[c]
.loop.midi_events[active_channels[c].record_pos]
.velocity = (ev.size > 2) ? ev.buffer[2] : 0;
active_channels[c].record_pos++;
if (sc->record_pos < MAX_MIDI_EVENTS) {
sc->loop.midi_events[sc->record_pos].timestamp = ev.time;
sc->loop.midi_events[sc->record_pos].status = ev.buffer[0];
sc->loop.midi_events[sc->record_pos].note =
(ev.size > 1) ? ev.buffer[1] : 0;
sc->loop.midi_events[sc->record_pos].velocity =
(ev.size > 2) ? ev.buffer[2] : 0;
sc->record_pos++;
}
}
/* forward incoming MIDI to output during record */
@@ -232,15 +238,13 @@ int process_callback(jack_nframes_t nframes, void *arg) {
jack_port_get_buffer(active_channels[c].midi_out, nframes);
if (midi_out_buf) {
jack_midi_clear_buffer(midi_out_buf);
int cnt =
active_channels[c].loop_count; /* number of recorded events */
int cnt = sc->loop_count;
if (cnt > 0) {
/* simple: output all recorded events at frame 0 of each cycle */
for (int e = 0; e < cnt; e++) {
unsigned char msg[3];
msg[0] = active_channels[c].loop.midi_events[e].status;
msg[1] = active_channels[c].loop.midi_events[e].note;
msg[2] = active_channels[c].loop.midi_events[e].velocity;
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);
}
}
@@ -251,7 +255,6 @@ int process_callback(jack_nframes_t nframes, void *arg) {
/* no output */
break;
default: /* IDLE */
/* pass through MIDI input to output */
{
void *midi_in_buf =
jack_port_get_buffer(active_channels[c].midi_in, nframes);
@@ -270,9 +273,8 @@ int process_callback(jack_nframes_t nframes, void *arg) {
}
break;
}
/* for MIDI channels, the loop_count holds number of recorded events */
if (state == STATE_LOOPING) {
active_channels[c].loop_count = active_channels[c].record_pos;
sc->loop_count = sc->record_pos;
}
} else {
/* audio channel handling */
@@ -283,9 +285,8 @@ int process_callback(jack_nframes_t nframes, void *arg) {
float *f_out = (float *)out;
const float *f_in = (const float *)in;
for (i = 0; i < nframes; i++) {
if (active_channels[c].record_pos < LOOP_BUF_SIZE)
active_channels[c]
.loop.audio_buffer[active_channels[c].record_pos++] = f_in[i];
if (sc->record_pos < LOOP_BUF_SIZE)
sc->loop.audio_buffer[sc->record_pos++] = f_in[i];
f_out[i] = f_in[i];
}
} else {
@@ -294,14 +295,11 @@ int process_callback(jack_nframes_t nframes, void *arg) {
break;
case STATE_LOOPING:
if (active_channels[c].loop_count > 0) {
if (sc->loop_count > 0) {
float *outf = (float *)out;
for (i = 0; i < nframes; i++) {
outf[i] = active_channels[c]
.loop.audio_buffer[active_channels[c].playback_pos];
active_channels[c].playback_pos =
(active_channels[c].playback_pos + 1) %
active_channels[c].loop_count;
outf[i] = sc->loop.audio_buffer[sc->playback_pos];
sc->playback_pos = (sc->playback_pos + 1) % sc->loop_count;
}
} else {
memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
@@ -322,7 +320,7 @@ int process_callback(jack_nframes_t nframes, void *arg) {
}
}
active_channels[c].prev_state = state;
sc->prev_state = state;
}
/* MIDI clock events – affect channel 0 only */
@@ -392,12 +390,14 @@ int looper_init(jack_client_t *client) {
}
struct channel_t *init = atomic_load(&channels);
/* channel 0 */
init[0].active = 1;
atomic_store(&init[0].state, STATE_IDLE);
init[0].prev_state = -1;
init[0].loop_count = 0;
init[0].record_pos = 0;
init[0].playback_pos = 0;
atomic_store(&init[0].active, 1);
init[0].scene_count = 1;
init[0].current_scene = 0;
init[0].scenes[0].loop_count = 0;
init[0].scenes[0].record_pos = 0;
init[0].scenes[0].playback_pos = 0;
atomic_store(&init[0].scenes[0].state, STATE_IDLE);
init[0].scenes[0].prev_state = -1;
init[0].audio_in = jack_port_register(
client, "input", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
@@ -471,6 +471,46 @@ void looper_process_commands(jack_client_t *client) {
}
break;
}
case CMD_ADD_SCENE: {
int cap = atomic_load(&channel_capacity);
struct channel_t *cur = get_channels_array();
int bind = atomic_load(&bind_channel);
int ch = bind;
if (ch < cap) {
channel_add_scene(client, ch);
}
break;
}
case CMD_REMOVE_SCENE: {
int cap = atomic_load(&channel_capacity);
struct channel_t *cur = get_channels_array();
int bind = atomic_load(&bind_channel);
int ch = bind;
if (ch < cap) {
channel_remove_scene(client, ch);
}
break;
}
case CMD_NEXT_SCENE: {
int cap = atomic_load(&channel_capacity);
struct channel_t *cur = get_channels_array();
int bind = atomic_load(&bind_channel);
int ch = bind;
if (ch < cap) {
channel_next_scene(client, ch);
}
break;
}
case CMD_PREV_SCENE: {
int cap = atomic_load(&channel_capacity);
struct channel_t *cur = get_channels_array();
int bind = atomic_load(&bind_channel);
int ch = bind;
if (ch < cap) {
channel_prev_scene(client, ch);
}
break;
}
default:
break;
}
@@ -519,6 +559,46 @@ void looper_process_commands(jack_client_t *client) {
}
break;
}
case CMD_ADD_SCENE: {
int cap = atomic_load(&channel_capacity);
struct channel_t *cur = get_channels_array();
int bind = atomic_load(&bind_channel);
int ch = bind;
if (ch < cap) {
channel_add_scene(client, ch);
}
break;
}
case CMD_REMOVE_SCENE: {
int cap = atomic_load(&channel_capacity);
struct channel_t *cur = get_channels_array();
int bind = atomic_load(&bind_channel);
int ch = bind;
if (ch < cap) {
channel_remove_scene(client, ch);
}
break;
}
case CMD_NEXT_SCENE: {
int cap = atomic_load(&channel_capacity);
struct channel_t *cur = get_channels_array();
int bind = atomic_load(&bind_channel);
int ch = bind;
if (ch < cap) {
channel_next_scene(client, ch);
}
break;
}
case CMD_PREV_SCENE: {
int cap = atomic_load(&channel_capacity);
struct channel_t *cur = get_channels_array();
int bind = atomic_load(&bind_channel);
int ch = bind;
if (ch < cap) {
channel_prev_scene(client, ch);
}
break;
}
default:
break;
}

20
src/midi.c
View File

@@ -71,6 +71,26 @@ void midi_handle_events(void *port_buffer, jack_nframes_t nframes) {
.type = CMD_ADD_MIDI_CHANNEL, .channel = -1, .data = 0};
queue_push(&cmd_queue_main_midi, cmd);
} break;
case 67: {
command_t cmd = {
.type = CMD_NEXT_SCENE, .channel = -1, .data = 0};
queue_push(&cmd_queue_main_midi, cmd);
} break;
case 68: {
command_t cmd = {
.type = CMD_PREV_SCENE, .channel = -1, .data = 0};
queue_push(&cmd_queue_main_midi, cmd);
} break;
case 69: {
command_t cmd = {
.type = CMD_ADD_SCENE, .channel = -1, .data = 0};
queue_push(&cmd_queue_main_midi, cmd);
} break;
case 70: {
command_t cmd = {
.type = CMD_REMOVE_SCENE, .channel = -1, .data = 0};
queue_push(&cmd_queue_main_midi, cmd);
} break;
default:
break;
}

12
src/pipe.c
View File

@@ -54,6 +54,18 @@ static void *pipe_thread_func(void *arg) {
} else if (strcmp(line, "unbind") == 0) {
command_t cmd = {.type = CMD_UNBIND, .channel = -1, .data = 0};
queue_push(&cmd_queue, cmd);
} else if (strcmp(line, "scene_add") == 0) {
command_t cmd = {.type = CMD_ADD_SCENE, .channel = -1, .data = 0};
queue_push(&cmd_queue_main_fifo, cmd);
} else if (strcmp(line, "scene_remove") == 0) {
command_t cmd = {.type = CMD_REMOVE_SCENE, .channel = -1, .data = 0};
queue_push(&cmd_queue_main_fifo, cmd);
} else if (strcmp(line, "scene_next") == 0) {
command_t cmd = {.type = CMD_NEXT_SCENE, .channel = -1, .data = 0};
queue_push(&cmd_queue_main_fifo, cmd);
} else if (strcmp(line, "scene_prev") == 0) {
command_t cmd = {.type = CMD_PREV_SCENE, .channel = -1, .data = 0};
queue_push(&cmd_queue_main_fifo, cmd);
}
/* ignore unknown lines */
}