676 lines
20 KiB
C
676 lines
20 KiB
C
// cppcheck-suppress missingIncludeSystem
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#include "looper.h"
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#include "channel.h"
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#include "midi.h"
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<<<<<<< HEAD
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#include "wav.h"
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#include "ringbuffer.h"
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#include "pipe.h"
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#include <jack/jack.h>
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#include <sys/stat.h>
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=======
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#include "queue.h"
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>>>>>>> 3-integrate-carla
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#include <fcntl.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 <pthread.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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<<<<<<< HEAD
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#include <time.h>
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#include "queue.h"
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#include "command.h"
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/* Global command queues */
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spsc_queue_t cmd_queue;
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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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=======
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#include <sys/stat.h>
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#include <unistd.h>
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>>>>>>> 3-integrate-carla
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#define STATUS_FIFO "/tmp/looper_status"
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/* writer status fd */
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static int status_fd = -1;
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static void looper_write_status(void) {
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<<<<<<< HEAD
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if (status_fd < 0)
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return;
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char buf[256];
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for (int ch = 0; ch < MAX_CHANNELS; ch++) {
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if (!atomic_load(&channels[ch].active))
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continue;
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int state_val = atomic_load(&channels[ch].state);
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const char *state_str;
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switch (state_val) {
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case STATE_IDLE: state_str = "IDLE"; break;
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case STATE_RECORD: state_str = "RECORD"; break;
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case STATE_LOOPING: state_str = "LOOPING"; break;
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case STATE_PAUSED: state_str = "PAUSED"; break;
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default: state_str = "UNKNOWN";
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}
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int n = snprintf(buf, sizeof(buf),
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"CH=%d SC=%d STATE=%s\n",
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ch, 0, state_str);
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if (n > 0) {
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int ret = write(status_fd, buf, n);
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(void)ret;
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}
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}
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=======
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int fd = open(STATUS_FIFO, O_WRONLY | O_NONBLOCK);
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if (fd < 0)
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return;
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struct channel_t *cur = get_channels_array();
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int cap = atomic_load(&channel_capacity);
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char buf[256];
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for (int ch = 0; ch < cap; ch++) {
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if (!atomic_load(&cur[ch].active))
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continue;
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int sc_idx = atomic_load(&cur[ch].current_scene);
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int state = atomic_load(&cur[ch].scenes[sc_idx].state);
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const char *state_str;
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switch (state) {
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case STATE_IDLE:
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state_str = "IDLE";
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break;
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case STATE_RECORD:
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state_str = "RECORD";
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break;
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case STATE_LOOPING:
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state_str = "LOOPING";
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break;
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case STATE_PAUSED:
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state_str = "PAUSED";
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break;
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default:
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state_str = "UNKNOWN";
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}
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int n = snprintf(buf, sizeof(buf), "CH=%d SC=%d STATE=%s\n", ch, sc_idx,
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state_str);
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if (n > 0) {
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int ret = write(fd, buf, n);
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(void)ret;
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}
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}
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close(fd);
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>>>>>>> 3-integrate-carla
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}
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/* Global state (shared across files) */
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struct channel_t channels[MAX_CHANNELS];
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atomic_int channel_count = 0;
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atomic_int channel_capacity = MAX_CHANNELS;
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int next_channel_id = 1;
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atomic_int cmd_add = 0;
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atomic_int cmd_remove = 0;
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atomic_int cmd_load = 0;
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atomic_int cmd_save = 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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/* Deferred removal index (1 second grace) */
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static int pending_unregister_idx = -1;
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/* writer thread function and sample rate holder */
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static void *writer_thread(void *arg);
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static int global_sample_rate = 0;
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/* execute a single command (called from looper_process_commands) */
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static void exec_command(command_t cmd, jack_client_t *client) {
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int ch = cmd.channel;
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if (ch < 0) ch = 0;
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switch (cmd.type) {
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case CMD_CYCLE: {
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int state = atomic_load(&channels[ch].state);
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switch (state) {
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case STATE_IDLE:
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atomic_store(&channels[ch].state, STATE_RECORD);
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break;
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case STATE_RECORD:
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atomic_store(&channels[ch].state, STATE_LOOPING);
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break;
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case STATE_LOOPING:
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atomic_store(&channels[ch].state, STATE_PAUSED);
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break;
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case STATE_PAUSED:
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atomic_store(&channels[ch].state, STATE_LOOPING);
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break;
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}
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atomic_store(&channels[ch].prev_state, -1);
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break;
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}
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case CMD_STOP:
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atomic_store(&channels[ch].state, STATE_IDLE);
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atomic_store(&channels[ch].prev_state, -1);
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break;
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case CMD_ADD_CHANNEL:
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case CMD_ADD_MIDI_CHANNEL: {
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int idx;
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for (idx = 0; idx < MAX_CHANNELS; idx++)
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if (!channels[idx].active)
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break;
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if (idx < MAX_CHANNELS)
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channel_add(client, idx);
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break;
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}
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case CMD_REMOVE_CHANNEL: {
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int remove_idx = -1;
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for (int idx = 1; idx < MAX_CHANNELS; idx++)
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if (channels[idx].active)
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remove_idx = idx;
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if (remove_idx != -1) {
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channel_remove(client, remove_idx);
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pending_unregister_idx = remove_idx;
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}
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break;
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}
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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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case CMD_LOAD:
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atomic_store(&cmd_load, 1);
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break;
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case CMD_SAVE:
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atomic_store(&cmd_save, 1);
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break;
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case CMD_ADD_SCENE:
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case CMD_REMOVE_SCENE:
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case CMD_NEXT_SCENE:
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case CMD_PREV_SCENE:
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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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/* process each active channel */
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for (int c = 0; c < MAX_CHANNELS; c++) {
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if (!atomic_load(&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 (!channels[c].audio_in || !channels[c].audio_out) {
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fprintf(stderr, "WARN: channel %d has NULL audio port(s), skipping\n", c);
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continue;
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}
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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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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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channels[c].audio_out, nframes);
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if (!out)
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continue;
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int state = atomic_load(&channels[c].state);
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if (state != atomic_load(&channels[c].prev_state)) {
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switch (state) {
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case STATE_RECORD:
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atomic_store(&channels[c].record_pos, 0);
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atomic_store(&channels[c].loop_count, 0);
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break;
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case STATE_LOOPING:
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if (atomic_load(&channels[c].prev_state) == STATE_RECORD &&
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atomic_load(&channels[c].record_pos) > 0)
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atomic_store(&channels[c].loop_count,
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atomic_load(&channels[c].record_pos));
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atomic_store(&channels[c].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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<<<<<<< HEAD
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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_fetch_add(&channels[c].record_pos, 1);
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if (rp < LOOP_BUF_SIZE)
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channels[c].loop_buffer[rp] = f_in[i];
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f_out[i] = f_in[i];
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}
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} else {
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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 = (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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} 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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>>>>>>> 3-integrate-carla
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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 lc = atomic_load(&channels[c].loop_count);
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if (lc > 0) {
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float *outf = (float *)out;
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for (i = 0; i < nframes; i++) {
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int pp = atomic_load(&channels[c].playback_pos);
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outf[i] = channels[c].loop_buffer[pp];
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atomic_store(&channels[c].playback_pos, (pp + 1) % lc);
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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_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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// push loop output into save ring if saving (atomic load)
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RingBuf *r = (RingBuf *)atomic_load_explicit(&channels[c].save_ring,
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memory_order_acquire);
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if (r != NULL) {
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if (state == STATE_LOOPING && atomic_load(&channels[c].loop_count) > 0) {
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const float *outf = (const float *)out;
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ring_write(r, outf, nframes);
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}
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}
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atomic_store(&channels[c].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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int s = atomic_load(&channels[0].state);
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if (s == STATE_IDLE)
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atomic_store(&channels[0].state, STATE_RECORD);
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break;
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}
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case 0xFC:
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atomic_store(&channels[0].state, STATE_IDLE);
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break;
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case 0xFB: {
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int s = atomic_load(&channels[0].state);
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if (s == STATE_PAUSED)
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atomic_store(&channels[0].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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}
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}
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}
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return 0;
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}
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/* ----------------------------------------------------------------
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* shutdown callback
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* ---------------------------------------------------------------- */
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void jack_shutdown_cb(void *arg) {
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(void)arg;
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fprintf(stderr, "JACK shutdown\n");
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exit(0);
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}
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/* ----------------------------------------------------------------
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* looper initialisation
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* ---------------------------------------------------------------- */
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int looper_init(jack_client_t *client) {
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/* store sample rate for writer thread */
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global_sample_rate = jack_get_sample_rate(client);
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/* create status FIFO (ignore if already exists) */
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mkfifo(STATUS_FIFO, 0666);
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/* open the status FIFO for reading+writing so writes work even without reader */
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status_fd = open(STATUS_FIFO, O_RDWR);
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if (status_fd < 0) {
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perror("open status FIFO");
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}
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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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||
/* 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;
|
||
}
|
||
|
||
/* ----------------------------------------------------------------
|
||
* main‑loop 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 real‑time 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();
|
||
}
|