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#include "tracker.h"
#include "audio.h"
#include "audio/synth.h"
#include "util/asset_manager.h"
#include <cstring>
#include <vector>
static uint32_t g_last_trigger_idx = 0;
// Active pattern instance tracking
struct ActivePattern {
uint16_t pattern_id;
float start_music_time; // When this pattern was triggered (music time)
uint32_t next_event_idx; // Next event to trigger within this pattern
bool active;
};
static ActivePattern g_active_patterns[MAX_SPECTROGRAMS];
struct ManagedSpectrogram {
int synth_id;
float* data;
bool active;
};
// Simple pool for dynamic spectrograms (now for individual notes)
static ManagedSpectrogram g_spec_pool[MAX_SPECTROGRAMS];
static int g_next_pool_slot = 0; // Round-robin allocation
void tracker_init() {
g_last_trigger_idx = 0;
g_next_pool_slot = 0;
for (int i = 0; i < MAX_SPECTROGRAMS; ++i) {
g_spec_pool[i].synth_id = -1;
g_spec_pool[i].data = nullptr;
g_spec_pool[i].active = false;
g_active_patterns[i].active = false;
}
}
void tracker_reset() {
g_last_trigger_idx = 0;
for (int i = 0; i < MAX_SPECTROGRAMS; ++i) {
g_active_patterns[i].active = false;
}
}
static int get_free_pool_slot() {
// Try to find an inactive slot first (unused slots)
for (int i = 0; i < MAX_SPECTROGRAMS; ++i) {
if (!g_spec_pool[i].active)
return i;
}
// If all slots are active, reuse the oldest one (round-robin)
// This automatically handles cleanup of old patterns
const int slot = g_next_pool_slot;
g_next_pool_slot = (g_next_pool_slot + 1) % MAX_SPECTROGRAMS;
return slot;
}
static int get_free_pattern_slot() {
for (int i = 0; i < MAX_SPECTROGRAMS; ++i) {
if (!g_active_patterns[i].active)
return i;
}
return -1; // No free slots
}
// Helper to trigger a single note event
static void trigger_note_event(const TrackerEvent& event) {
std::vector<float> note_data;
int note_frames = 0;
// Load or generate the note spectrogram
AssetId aid = g_tracker_sample_assets[event.sample_id];
if (aid != AssetId::ASSET_LAST_ID) {
size_t size;
const uint8_t* data = GetAsset(aid, &size);
if (data && size >= sizeof(SpecHeader)) {
const SpecHeader* header = (const SpecHeader*)data;
note_frames = header->num_frames;
const float* src_spectral_data =
(const float*)(data + sizeof(SpecHeader));
note_data.assign(src_spectral_data,
src_spectral_data + (size_t)note_frames * DCT_SIZE);
}
} else {
const NoteParams& params = g_tracker_samples[event.sample_id];
note_data = generate_note_spectrogram(params, ¬e_frames);
}
if (note_frames > 0) {
const int slot = get_free_pool_slot();
// Clean up old data in this slot if reusing
if (g_spec_pool[slot].synth_id != -1) {
synth_unregister_spectrogram(g_spec_pool[slot].synth_id);
g_spec_pool[slot].synth_id = -1;
}
if (g_spec_pool[slot].data != nullptr) {
delete[] g_spec_pool[slot].data;
g_spec_pool[slot].data = nullptr;
}
// Allocate and register new note
g_spec_pool[slot].data = new float[note_data.size()];
memcpy(g_spec_pool[slot].data, note_data.data(),
note_data.size() * sizeof(float));
Spectrogram spec;
spec.spectral_data_a = g_spec_pool[slot].data;
spec.spectral_data_b = g_spec_pool[slot].data;
spec.num_frames = note_frames;
g_spec_pool[slot].synth_id = synth_register_spectrogram(&spec);
g_spec_pool[slot].active = true;
synth_trigger_voice(g_spec_pool[slot].synth_id, event.volume, event.pan);
}
}
void tracker_update(float music_time_sec) {
// Step 1: Process new pattern triggers
while (g_last_trigger_idx < g_tracker_score.num_triggers) {
const TrackerPatternTrigger& trigger =
g_tracker_score.triggers[g_last_trigger_idx];
if (trigger.time_sec > music_time_sec)
break;
// Add this pattern to active patterns list
const int slot = get_free_pattern_slot();
if (slot != -1) {
g_active_patterns[slot].pattern_id = trigger.pattern_id;
g_active_patterns[slot].start_music_time = trigger.time_sec;
g_active_patterns[slot].next_event_idx = 0;
g_active_patterns[slot].active = true;
}
g_last_trigger_idx++;
}
// Step 2: Update all active patterns and trigger individual events
const float beat_duration = 60.0f / g_tracker_score.bpm;
for (int i = 0; i < MAX_SPECTROGRAMS; ++i) {
if (!g_active_patterns[i].active)
continue;
ActivePattern& active = g_active_patterns[i];
const TrackerPattern& pattern = g_tracker_patterns[active.pattern_id];
// Calculate elapsed beats since pattern started
const float elapsed_music_time = music_time_sec - active.start_music_time;
const float elapsed_beats = elapsed_music_time / beat_duration;
// Trigger all events that have passed their beat time
while (active.next_event_idx < pattern.num_events) {
const TrackerEvent& event = pattern.events[active.next_event_idx];
if (event.beat > elapsed_beats)
break; // This event hasn't reached its time yet
// Trigger this event as an individual voice
trigger_note_event(event);
active.next_event_idx++;
}
// If all events have been triggered, mark pattern as complete
if (active.next_event_idx >= pattern.num_events) {
active.active = false;
}
}
}
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