melhorando a leitura de projetos no mmpCreator

assets/js/creations/pattern/pattern_audio.js

@@ -320,7 +320,7 @@ function schedulePianoRoll() {
 }
 
 // =========================================================================
-// Renderizar o Pattern atual para um Blob de Áudio (MANTIDO ORIGINAL)
+// Renderizar o Pattern atual para um Blob de Áudio 
 // =========================================================================
 
 export async function renderActivePatternToBlob() {
@@ -477,7 +477,7 @@ export async function renderActivePatternToBlob() {
 }
 
 // =========================================================================
-// FUNÇÃO UTILITÁRIA: Converte AudioBuffer para Blob WAV (MANTIDO ORIGINAL)
+// FUNÇÃO UTILITÁRIA: Converte AudioBuffer para Blob WAV 
 // =========================================================================
 
 function bufferToWave(abuffer) {
@@ -539,3 +539,81 @@ function bufferToWave(abuffer) {
 
   return new Blob([buffer], { type: "audio/wav" });
 }
+
+// ===============================
+// Song/Playlist Pattern Scheduler
+// (toca patterns arranjadas na Playlist)
+// ===============================
+
+const LMMS_TICKS_PER_STEP = 12;
+let songPatternScheduleId = null;
+
+export function startSongPatternPlaybackOnTransport() {
+  initializeAudioContext();
+  if (songPatternScheduleId !== null) return;
+
+  songPatternScheduleId = Tone.Transport.scheduleRepeat((time) => {
+    // bpm atual
+    const bpm = parseInt(document.getElementById("bpm-input")?.value, 10) || 120;
+    const stepIntervalSec = 60 / (bpm * 4);
+
+    // step absoluto do song (considera seek do Transport)
+    const songStep = Math.floor(Tone.Transport.seconds / stepIntervalSec + 1e-6);
+    const songTick = songStep * LMMS_TICKS_PER_STEP;
+
+    // quais patterns (colunas) estão ativas neste tick?
+    const basslineTracks = appState.pattern.tracks.filter(
+      (t) => t.type === "bassline" && !t.isMuted
+    );
+
+    const activePatternHits = [];
+    for (const b of basslineTracks) {
+      const clips = b.playlist_clips || [];
+      const clip = clips.find((c) => songTick >= c.pos && songTick < c.pos + c.len);
+      if (!clip) continue;
+
+      const localStep = Math.floor((songTick - clip.pos) / LMMS_TICKS_PER_STEP);
+      activePatternHits.push({ patternIndex: b.patternIndex, localStep });
+    }
+
+    if (activePatternHits.length === 0) return;
+
+    // dispara instrumentos reais (samplers/plugins)
+    for (const track of appState.pattern.tracks) {
+      if (track.type === "bassline") continue;
+      if (track.muted) continue;
+
+      for (const hit of activePatternHits) {
+        const patt = track.patterns?.[hit.patternIndex];
+        if (!patt?.steps) continue;
+
+        if (patt.steps[hit.localStep]) {
+          // SAMPLER
+          if (track.type === "sampler" && track.player) {
+            track.player.restart = true; // baterias precisam retrigger
+            try {
+              track.player.start(time);
+            } catch {}
+          }
+          // PLUGIN (step sem piano roll)
+          else if (track.type === "plugin" && track.instrument) {
+            const hasNotes = patt.notes && patt.notes.length > 0;
+            if (!hasNotes) {
+              try {
+                track.instrument.triggerAttackRelease("C5", "16n", time);
+              } catch {}
+            }
+          }
+        }
+      }
+    }
+  }, "16n");
+}
+
+export function stopSongPatternPlaybackOnTransport() {
+  if (songPatternScheduleId === null) return;
+  try {
+    Tone.Transport.clear(songPatternScheduleId);
+  } catch {}
+  songPatternScheduleId = null;
+}