playlist funcional. inserindo loops de uma mesma faixa de pattern

assets/js/creations/file.js

@@ -377,6 +377,60 @@ export async function parseMmpContent(xmlString) {
 
   const pathMap = getSamplePathMap();
 
+  // -------------------------------------------------------------
+  // 2.1) EXTRAÇÃO DE SAMPLETRACKS DO SONG EDITOR (track[type="2"])
+  // -------------------------------------------------------------
+  const secondsPerStep = getSecondsPerStep(); // já é usado no JSON parser :contentReference[oaicite:3]{index=3}
+  const sampleTrackNodes = Array.from(
+    xmlDoc.querySelectorAll('song > trackcontainer > track[type="2"]')
+  );
+
+  sampleTrackNodes.forEach((node, idx) => {
+    const trackName = node.getAttribute("name") || `Áudio ${idx + 1}`;
+
+    // cria lane de áudio
+    const trackId = `sample_lane_${Date.now()}_${idx}`;
+    appState.audio.tracks.push({ id: trackId, name: trackName });
+
+    // pan/vol defaults do <sampletrack>
+    const st = node.querySelector("sampletrack");
+    const laneVol = st ? Number(st.getAttribute("vol") ?? 100) / 100 : 1;
+    const lanePan = st ? Number(st.getAttribute("pan") ?? 0) / 100 : 0;
+
+    // cada <sampletco> é um clip
+    const clips = Array.from(node.querySelectorAll(":scope > sampletco"));
+    clips.forEach((c, cidx) => {
+      const src = c.getAttribute("src") || "";
+      const fileName = src.split(/[\\/]/).pop(); // "#2.wav"
+
+      // resolve caminho via manifest; fallback para /samples
+      const resolvedUrl =
+        (fileName && pathMap[fileName]) ||
+        (fileName ? `${SAMPLE_SRC}/${fileName}` : null);
+
+      if (!resolvedUrl) return;
+
+      const posTicks = Number(c.getAttribute("pos") || 0);
+      const lenTicks = Number(c.getAttribute("len") || 0);
+
+      const startSec = ((posTicks / 12) * secondsPerStep);
+      const durSec = ((lenTicks / 12) * secondsPerStep);
+
+      const clipId = `clip_${trackId}_${cidx}`;
+
+      addAudioClipToTimeline(resolvedUrl, trackId, startSec, clipId, fileName);
+
+      const muted = String(c.getAttribute("muted") ?? "0") === "1";
+
+      updateAudioClipProperties(clipId, {
+        durationInSeconds: durSec || 0,
+        volume: muted ? 0 : laneVol,
+        pan: isNaN(lanePan) ? 0 : lanePan,
+      });
+    });
+  });
+
+
   // 1. Identifica colunas de beat/patterns (usado para mapear steps)
   // Normalmente ficam dentro do primeiro container de Bassline
   const bbTrackNodes = Array.from(xmlDoc.querySelectorAll('track[type="1"]'));