move engine to engine/
This commit is contained in:
Loic Coenen
634
engine/src/looper.c
Normal file
634
engine/src/looper.c
Normal file
@@ -0,0 +1,634 @@
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// cppcheck-suppress missingIncludeSystem
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#include "looper.h"
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#include "channel.h"
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#include "command.h"
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#include "midi.h"
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#include "queue.h"
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#include <jack/jack.h>
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#include <jack/midiport.h>
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#include <math.h>
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#include <stdatomic.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* Global state (shared across files) */
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struct channel_t *_Atomic channels = NULL;
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atomic_int channel_capacity = 0;
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atomic_int channel_count = 0;
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int next_channel_id = 1;
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spsc_queue_t cmd_queue_main_midi;
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spsc_queue_t cmd_queue_main_fifo;
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atomic_int global_rt_cycles = 0;
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jack_port_t *midi_control_port = NULL;
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jack_port_t *midi_clock_port = NULL;
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atomic_int control_key_active = 0;
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atomic_int bind_channel = 0;
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spsc_queue_t cmd_queue;
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/* Deferred removal index and cycle counter */
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static int pending_unregister_idx = -1;
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static int pending_unregister_cycle = 0;
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/* Deferred free of old channel array (must not free while RT thread may hold
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* pointer) */
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static struct channel_t *pending_old = NULL;
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static int pending_old_cycle = 0;
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/* Helper: grow the channel array so that index idx is valid */
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static int ensure_capacity(jack_client_t *client, int idx) {
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(void)client;
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int cur_cap = atomic_load(&channel_capacity);
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if (idx < cur_cap)
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return 0;
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int new_cap = cur_cap == 0 ? 8 : cur_cap;
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while (new_cap <= idx)
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new_cap *= 2;
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struct channel_t *new_arr = calloc(new_cap, sizeof(struct channel_t));
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if (!new_arr)
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return -1;
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/* copy existing channels */
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if (cur_cap > 0)
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memcpy(new_arr, atomic_load(&channels), cur_cap * sizeof(struct channel_t));
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/* atomically publish new array, defer free of old */
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struct channel_t *old = atomic_exchange(&channels, new_arr);
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atomic_store(&channel_capacity, new_cap);
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/* schedule old pointer for later deallocation (after RT cycle) */
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pending_old = old;
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pending_old_cycle = atomic_load(&global_rt_cycles);
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return 0;
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}
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static void apply_command(command_t cmd) {
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int cap = atomic_load(&channel_capacity);
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struct channel_t *cur = get_channels_array();
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switch (cmd.type) {
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case CMD_CYCLE:
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if (cmd.channel >= 0 && cmd.channel < cap) {
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int sc_idx = atomic_load(&cur[cmd.channel].current_scene);
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scene_t *sc = &cur[cmd.channel].scenes[sc_idx];
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int cst = atomic_load(&sc->state);
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int next;
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switch (cst) {
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case STATE_IDLE:
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next = STATE_RECORD;
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break;
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case STATE_RECORD:
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next = STATE_LOOPING;
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break;
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case STATE_LOOPING:
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next = STATE_PAUSED;
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break;
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case STATE_PAUSED:
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next = STATE_LOOPING;
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break;
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default:
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next = STATE_IDLE;
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break;
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}
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atomic_store(&sc->state, next);
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}
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break;
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case CMD_STOP:
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if (cmd.channel >= 0 && cmd.channel < cap) {
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struct channel_t *ch = &cur[cmd.channel];
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int sc_cnt = atomic_load(&ch->scene_count);
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for (int s = 0; s < sc_cnt; s++) {
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atomic_store(&ch->scenes[s].state, STATE_IDLE);
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atomic_store(&ch->scenes[s].loop_count, 0);
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atomic_store(&ch->scenes[s].record_pos, 0);
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atomic_store(&ch->scenes[s].playback_pos, 0);
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atomic_store(&ch->scenes[s].prev_state, -1);
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}
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} else {
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for (int i = 0; i < cap; i++) {
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struct channel_t *ch = &cur[i];
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int sc_cnt = atomic_load(&ch->scene_count);
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for (int s = 0; s < sc_cnt; s++) {
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atomic_store(&ch->scenes[s].state, STATE_IDLE);
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atomic_store(&ch->scenes[s].loop_count, 0);
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atomic_store(&ch->scenes[s].record_pos, 0);
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atomic_store(&ch->scenes[s].playback_pos, 0);
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atomic_store(&ch->scenes[s].prev_state, -1);
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}
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}
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}
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break;
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case CMD_BIND_CHANNEL:
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atomic_store(&bind_channel, cmd.data);
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break;
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case CMD_UNBIND:
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atomic_store(&bind_channel, 0);
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break;
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default:
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break;
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}
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}
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/* ----------------------------------------------------------------
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* process callback
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* ---------------------------------------------------------------- */
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int process_callback(jack_nframes_t nframes, void *arg) {
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(void)arg;
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if (midi_control_port) {
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void *midi_ctrl_buf = jack_port_get_buffer(midi_control_port, nframes);
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if (midi_ctrl_buf) {
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midi_handle_events(midi_ctrl_buf, nframes);
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}
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}
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/* drain RT‑safe commands */
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command_t cmd;
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while (queue_pop(&cmd_queue, &cmd)) {
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apply_command(cmd);
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}
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/* process each active channel */
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struct channel_t *active_channels = get_channels_array();
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int cap = atomic_load(&channel_capacity);
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for (int c = 0; c < cap; c++) {
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if (!atomic_load(&active_channels[c].active))
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continue;
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/* Guard against NULL ports (e.g. if port registration failed) */
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if (active_channels[c].type == CHANNEL_AUDIO) {
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if (!active_channels[c].audio_in || !active_channels[c].audio_out) {
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fprintf(stderr, "WARN: channel %d has NULL audio port(s), skipping\n",
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c);
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continue;
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}
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} else {
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/* CHANNEL_MIDI */
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if (!active_channels[c].midi_in || !active_channels[c].midi_out) {
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fprintf(stderr, "WARN: channel %d has NULL MIDI port(s), skipping\n",
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c);
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continue;
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}
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}
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/* Obtain current scene pointer */
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int sc_idx = atomic_load(&active_channels[c].current_scene);
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scene_t *sc = &active_channels[c].scenes[sc_idx];
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const jack_default_audio_sample_t *in =
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(const jack_default_audio_sample_t *)jack_port_get_buffer(
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active_channels[c].audio_in, nframes);
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jack_default_audio_sample_t *out =
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(jack_default_audio_sample_t *)jack_port_get_buffer(
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active_channels[c].audio_out, nframes);
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if (!out)
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continue;
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int state = atomic_load(&sc->state);
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int prev_state = atomic_load(&sc->prev_state);
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if (state != prev_state) {
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switch (state) {
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case STATE_RECORD:
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atomic_store(&sc->record_pos, 0);
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atomic_store(&sc->loop_count, 0);
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break;
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case STATE_LOOPING:
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if (atomic_load(&sc->record_pos) > 0)
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atomic_store(&sc->loop_count, atomic_load(&sc->record_pos));
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atomic_store(&sc->playback_pos, 0);
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break;
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default:
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break;
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}
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}
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if (active_channels[c].type == CHANNEL_MIDI) {
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/* MIDI channel handling */
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switch (state) {
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case STATE_RECORD: {
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void *midi_in_buf =
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jack_port_get_buffer(active_channels[c].midi_in, nframes);
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if (midi_in_buf) {
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jack_nframes_t nevents = jack_midi_get_event_count(midi_in_buf);
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jack_midi_event_t ev;
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for (jack_nframes_t j = 0; j < nevents; j++) {
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if (jack_midi_event_get(&ev, midi_in_buf, j) != 0)
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continue;
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int rp = atomic_load(&sc->record_pos);
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if (rp < MAX_MIDI_EVENTS) {
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sc->loop.midi_events[rp].timestamp = ev.time;
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sc->loop.midi_events[rp].status = ev.buffer[0];
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sc->loop.midi_events[rp].note =
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(ev.size > 1) ? ev.buffer[1] : 0;
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sc->loop.midi_events[rp].velocity =
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(ev.size > 2) ? ev.buffer[2] : 0;
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atomic_store(&sc->record_pos, rp + 1);
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}
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}
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/* forward incoming MIDI to output during record */
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void *midi_out_buf =
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jack_port_get_buffer(active_channels[c].midi_out, nframes);
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if (midi_out_buf) {
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jack_midi_clear_buffer(midi_out_buf);
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for (jack_nframes_t j = 0; j < nevents; j++) {
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if (jack_midi_event_get(&ev, midi_in_buf, j) != 0)
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continue;
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jack_midi_event_write(midi_out_buf, ev.time, ev.buffer, ev.size);
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}
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}
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}
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break;
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}
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case STATE_LOOPING: {
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void *midi_out_buf =
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jack_port_get_buffer(active_channels[c].midi_out, nframes);
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if (midi_out_buf) {
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jack_midi_clear_buffer(midi_out_buf);
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int cnt = atomic_load(&sc->loop_count);
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if (cnt > 0) {
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for (int e = 0; e < cnt; e++) {
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unsigned char msg[3];
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msg[0] = sc->loop.midi_events[e].status;
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msg[1] = sc->loop.midi_events[e].note;
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msg[2] = sc->loop.midi_events[e].velocity;
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jack_midi_event_write(midi_out_buf, 0, msg, 3);
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}
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}
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}
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break;
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}
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case STATE_PAUSED:
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/* no output */
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break;
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default: /* IDLE */
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{
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void *midi_in_buf =
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jack_port_get_buffer(active_channels[c].midi_in, nframes);
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void *midi_out_buf =
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jack_port_get_buffer(active_channels[c].midi_out, nframes);
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if (midi_in_buf && midi_out_buf) {
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jack_midi_clear_buffer(midi_out_buf);
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jack_nframes_t nevents = jack_midi_get_event_count(midi_in_buf);
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jack_midi_event_t ev;
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for (jack_nframes_t j = 0; j < nevents; j++) {
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if (jack_midi_event_get(&ev, midi_in_buf, j) != 0)
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continue;
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jack_midi_event_write(midi_out_buf, ev.time, ev.buffer, ev.size);
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}
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}
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}
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break;
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}
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if (state == STATE_LOOPING) {
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atomic_store(&sc->loop_count, atomic_load(&sc->record_pos));
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}
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} else {
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/* audio channel handling */
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jack_nframes_t i;
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switch (state) {
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case STATE_RECORD:
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if (in) {
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float *f_out = (float *)out;
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const float *f_in = (const float *)in;
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for (i = 0; i < nframes; i++) {
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int rp = atomic_load(&sc->record_pos);
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if (rp < LOOP_BUF_SIZE) {
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sc->loop.audio_buffer[rp] = f_in[i];
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atomic_store(&sc->record_pos, rp + 1);
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}
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f_out[i] = f_in[i];
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}
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} else {
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memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
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}
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break;
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case STATE_LOOPING: {
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int loop_cnt = atomic_load(&sc->loop_count);
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if (loop_cnt > 0) {
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float *outf = (float *)out;
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int pp = atomic_load(&sc->playback_pos);
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for (i = 0; i < nframes; i++) {
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outf[i] = sc->loop.audio_buffer[pp];
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pp = (pp + 1) % loop_cnt;
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}
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atomic_store(&sc->playback_pos, pp);
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} else {
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memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
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}
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break;
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}
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case STATE_PAUSED:
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memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
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break;
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default: /* IDLE */
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if (in) {
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memcpy(out, in, sizeof(jack_default_audio_sample_t) * nframes);
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} else {
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memset(out, 0, sizeof(jack_default_audio_sample_t) * nframes);
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}
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break;
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}
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}
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atomic_store(&sc->prev_state, state);
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}
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/* MIDI clock events – affect channel 0 only */
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if (midi_clock_port) {
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void *midi_clock_buf = jack_port_get_buffer(midi_clock_port, nframes);
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if (midi_clock_buf) {
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jack_nframes_t n_clock_events = jack_midi_get_event_count(midi_clock_buf);
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jack_midi_event_t cev;
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for (jack_nframes_t j = 0; j < n_clock_events; j++) {
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if (jack_midi_event_get(&cev, midi_clock_buf, j) != 0)
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continue;
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if (cev.size >= 1) {
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unsigned char msg = cev.buffer[0];
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switch (msg) {
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case 0xFA: {
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struct channel_t *cur = atomic_load(&channels);
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int sc_idx = atomic_load(&cur[0].current_scene);
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int s = atomic_load(&cur[0].scenes[sc_idx].state);
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if (s == STATE_IDLE)
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atomic_store(&cur[0].scenes[sc_idx].state, STATE_RECORD);
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break;
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}
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case 0xFC: {
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struct channel_t *cur = atomic_load(&channels);
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int sc_idx = atomic_load(&cur[0].current_scene);
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atomic_store(&cur[0].scenes[sc_idx].state, STATE_IDLE);
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break;
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}
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case 0xFB: {
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struct channel_t *cur = atomic_load(&channels);
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int sc_idx = atomic_load(&cur[0].current_scene);
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int s = atomic_load(&cur[0].scenes[sc_idx].state);
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if (s == STATE_PAUSED)
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atomic_store(&cur[0].scenes[sc_idx].state, STATE_LOOPING);
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break;
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||||
}
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||||
default:
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break;
|
||||
}
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||||
}
|
||||
}
|
||||
}
|
||||
}
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||||
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||||
atomic_fetch_add_explicit(&global_rt_cycles, 1, memory_order_release);
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return 0;
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||||
}
|
||||
|
||||
/* ----------------------------------------------------------------
|
||||
* shutdown callback
|
||||
* ---------------------------------------------------------------- */
|
||||
void jack_shutdown_cb(void *arg) {
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||||
(void)arg;
|
||||
fprintf(stderr, "JACK shutdown\n");
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||||
exit(0);
|
||||
}
|
||||
|
||||
/* ----------------------------------------------------------------
|
||||
* looper initialisation
|
||||
* ---------------------------------------------------------------- */
|
||||
int looper_init(jack_client_t *client) {
|
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queue_init(&cmd_queue);
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||||
queue_init(&cmd_queue_main_midi);
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queue_init(&cmd_queue_main_fifo);
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||||
|
||||
/* allocate initial array for at least one channel */
|
||||
if (ensure_capacity(client, 0) != 0) {
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||||
fprintf(stderr, "Cannot allocate channel array\n");
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||||
return -1;
|
||||
}
|
||||
struct channel_t *init = atomic_load(&channels);
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||||
/* channel 0 */
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||||
atomic_store(&init[0].active, 1);
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||||
atomic_store(&init[0].scene_count, 1);
|
||||
atomic_store(&init[0].current_scene, 0);
|
||||
atomic_store(&init[0].scenes[0].loop_count, 0);
|
||||
atomic_store(&init[0].scenes[0].record_pos, 0);
|
||||
atomic_store(&init[0].scenes[0].playback_pos, 0);
|
||||
atomic_store(&init[0].scenes[0].state, STATE_IDLE);
|
||||
atomic_store(&init[0].scenes[0].prev_state, -1);
|
||||
|
||||
init[0].audio_in = jack_port_register(
|
||||
client, "input", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
|
||||
init[0].audio_out = jack_port_register(
|
||||
client, "output", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
|
||||
if (!init[0].audio_in || !init[0].audio_out) {
|
||||
fprintf(stderr, "Could not create audio ports for channel 0\n");
|
||||
return -1;
|
||||
}
|
||||
atomic_store(&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) {
|
||||
/* Drain main‑loop command queues (add/remove) */
|
||||
command_t cmd;
|
||||
while (queue_pop(&cmd_queue_main_midi, &cmd)) {
|
||||
switch (cmd.type) {
|
||||
case CMD_ADD_CHANNEL: {
|
||||
int cap = atomic_load(&channel_capacity);
|
||||
int idx;
|
||||
for (idx = 0; idx < cap; idx++)
|
||||
if (!atomic_load(&(get_channels_array()[idx].active)))
|
||||
break;
|
||||
if (idx == cap) {
|
||||
if (ensure_capacity(client, idx) != 0)
|
||||
break;
|
||||
}
|
||||
channel_add(client, idx);
|
||||
break;
|
||||
}
|
||||
case CMD_ADD_MIDI_CHANNEL: {
|
||||
int cap = atomic_load(&channel_capacity);
|
||||
int idx;
|
||||
for (idx = 0; idx < cap; idx++)
|
||||
if (!atomic_load(&(get_channels_array()[idx].active)))
|
||||
break;
|
||||
if (idx == cap) {
|
||||
if (ensure_capacity(client, idx) != 0)
|
||||
break;
|
||||
}
|
||||
channel_add_midi(client, idx);
|
||||
break;
|
||||
}
|
||||
case CMD_REMOVE_CHANNEL: {
|
||||
int cap = atomic_load(&channel_capacity);
|
||||
int remove_idx = -1;
|
||||
for (int idx = 1; idx < cap; idx++)
|
||||
if (atomic_load(&(get_channels_array()[idx].active)))
|
||||
remove_idx = idx;
|
||||
if (remove_idx != -1) {
|
||||
channel_remove(client, remove_idx);
|
||||
pending_unregister_idx = remove_idx;
|
||||
pending_unregister_cycle = atomic_load(&global_rt_cycles);
|
||||
}
|
||||
break;
|
||||
}
|
||||
case CMD_ADD_SCENE: {
|
||||
int cap = atomic_load(&channel_capacity);
|
||||
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);
|
||||
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);
|
||||
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);
|
||||
int bind = atomic_load(&bind_channel);
|
||||
int ch = bind;
|
||||
if (ch < cap) {
|
||||
channel_prev_scene(client, ch);
|
||||
}
|
||||
break;
|
||||
}
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
while (queue_pop(&cmd_queue_main_fifo, &cmd)) {
|
||||
switch (cmd.type) {
|
||||
case CMD_ADD_CHANNEL: {
|
||||
int cap = atomic_load(&channel_capacity);
|
||||
int idx;
|
||||
for (idx = 0; idx < cap; idx++)
|
||||
if (!atomic_load(&(get_channels_array()[idx].active)))
|
||||
break;
|
||||
if (idx == cap) {
|
||||
if (ensure_capacity(client, idx) != 0)
|
||||
break;
|
||||
}
|
||||
channel_add(client, idx);
|
||||
break;
|
||||
}
|
||||
case CMD_ADD_MIDI_CHANNEL: {
|
||||
int cap = atomic_load(&channel_capacity);
|
||||
int idx;
|
||||
for (idx = 0; idx < cap; idx++)
|
||||
if (!atomic_load(&(get_channels_array()[idx].active)))
|
||||
break;
|
||||
if (idx == cap) {
|
||||
if (ensure_capacity(client, idx) != 0)
|
||||
break;
|
||||
}
|
||||
channel_add_midi(client, idx);
|
||||
break;
|
||||
}
|
||||
case CMD_REMOVE_CHANNEL: {
|
||||
int cap = atomic_load(&channel_capacity);
|
||||
int remove_idx = -1;
|
||||
for (int idx = 1; idx < cap; idx++)
|
||||
if (atomic_load(&(get_channels_array()[idx].active)))
|
||||
remove_idx = idx;
|
||||
if (remove_idx != -1) {
|
||||
channel_remove(client, remove_idx);
|
||||
pending_unregister_idx = remove_idx;
|
||||
pending_unregister_cycle = atomic_load(&global_rt_cycles);
|
||||
}
|
||||
break;
|
||||
}
|
||||
case CMD_ADD_SCENE: {
|
||||
int cap = atomic_load(&channel_capacity);
|
||||
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);
|
||||
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);
|
||||
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);
|
||||
int bind = atomic_load(&bind_channel);
|
||||
int ch = bind;
|
||||
if (ch < cap) {
|
||||
channel_prev_scene(client, ch);
|
||||
}
|
||||
break;
|
||||
}
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Deferred port unregistration – wait until RT thread has seen active=0 */
|
||||
if (pending_unregister_idx != -1) {
|
||||
int current_cycle = atomic_load(&global_rt_cycles);
|
||||
if (current_cycle - pending_unregister_cycle >= 1) {
|
||||
int idx = pending_unregister_idx;
|
||||
struct channel_t *cur = atomic_load(&channels);
|
||||
if (cur[idx].audio_in)
|
||||
jack_port_unregister(client, cur[idx].audio_in);
|
||||
if (cur[idx].audio_out)
|
||||
jack_port_unregister(client, cur[idx].audio_out);
|
||||
if (cur[idx].midi_in)
|
||||
jack_port_unregister(client, cur[idx].midi_in);
|
||||
if (cur[idx].midi_out)
|
||||
jack_port_unregister(client, cur[idx].midi_out);
|
||||
pending_unregister_idx = -1;
|
||||
}
|
||||
}
|
||||
|
||||
/* Deferred free of old channel array – wait until RT thread has seen new
|
||||
* pointer */
|
||||
if (pending_old != NULL) {
|
||||
int current_cycle = atomic_load(&global_rt_cycles);
|
||||
if (current_cycle - pending_old_cycle >= 1) {
|
||||
free(pending_old);
|
||||
pending_old = NULL;
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user