corrigindo cortes de samples no download de projetos do mmpCreator

assets/js/creations/file.js

@@ -12,7 +12,7 @@ import {
 import { loadAudioForTrack } from "./pattern/pattern_state.js";
 import { renderAll, getSamplePathMap } from "./ui.js";
 import { DEFAULT_PAN, DEFAULT_VOLUME, NOTE_LENGTH } from "./config.js";
-import { initializeAudioContext, getMainGainNode } from "./audio.js";
+import { initializeAudioContext, getMainGainNode, getAudioContext } from "./audio.js";
 import { DEFAULT_PROJECT_XML, getSecondsPerStep, SAMPLE_SRC } from "./utils.js";
 import * as Tone from "https://esm.sh/tone";
 import { sendAction } from "./socket.js";
@@ -669,14 +669,15 @@ export async function parseMmpContent(xmlString) {
 }
 
 // --------------------------------------------------------------
-// GERAÇÃO DE ARQUIVO (EXPORT)
+// GERAÇÃO DE ARQUIVO (EXPORT) — MMPZ com WAVs “sliceados”
 // --------------------------------------------------------------
 
-export function generateMmpFile() {
+// ✅ agora é async porque vamos gerar zip + wavs
+export async function generateMmpFile() {
   if (appState.global.originalXmlDoc) {
-    modifyAndSaveExistingMmp();
+    await modifyAndSaveExistingMmp();
   } else {
-    generateNewMmp();
+    await generateNewMmp();
   }
 }
 
@@ -806,7 +807,6 @@ function applyPlaylistClipsToXml(xmlDoc) {
   }
 }
 
-
 function createTrackXml(track) {
   if (!track.patterns || track.patterns.length === 0) return "";
 
@@ -866,12 +866,12 @@ function createTrackXml(track) {
     </track>`;
 }
 
-function modifyAndSaveExistingMmp() {
+async function modifyAndSaveExistingMmp() {
   const content = generateXmlFromState();
   downloadFile(content, "projeto_editado.mmp");
 }
 
-function generateNewMmp() {
+async function generateNewMmp() {
   const content = generateXmlFromState();
   downloadFile(content, "novo_projeto.mmp");
 }
@@ -888,4 +888,257 @@ function downloadFile(content, fileName) {
   URL.revokeObjectURL(url);
 }
 
+async function generateAndDownloadMmpz(baseName) {
+  initializeAudioContext();
+
+  // 1) gera XML base (patterns OK) — hoje isso já funciona no seu projeto
+  const baseXmlString = generateXmlFromState(); // já inclui applyPlaylistClipsToXml :contentReference[oaicite:3]{index=3}
+  const xmlDoc = new DOMParser().parseFromString(baseXmlString, "application/xml");
+
+  // 2) cria zip e injeta samples sliceados + reescreve sampletracks/sampletco
+  // eslint-disable-next-line no-undef
+  const zip = new JSZip();
+
+  await applySampleTracksToXmlAndZip(xmlDoc, zip);
+
+  // 3) grava o .mmp dentro do zip
+  const finalXml = new XMLSerializer().serializeToString(xmlDoc);
+  const mmpName = `${baseName}.mmp`;
+  zip.file(mmpName, finalXml);
+
+  // 4) baixa .mmpz
+  const blob = await zip.generateAsync({ type: "blob", compression: "DEFLATE" });
+  downloadBlob(blob, `${baseName}.mmpz`);
+}
+
+function downloadBlob(blob, fileName) {
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement("a");
+  a.href = url;
+  a.download = fileName;
+  document.body.appendChild(a);
+  a.click();
+  document.body.removeChild(a);
+  URL.revokeObjectURL(url);
+}
+
+// -------------------- WAV helpers --------------------
+
+function _sanitizeFileName(name) {
+  return String(name || "clip")
+    .normalize("NFKD")
+    .replace(/[^\w\-\.]+/g, "_")
+    .replace(/_+/g, "_")
+    .replace(/^_+|_+$/g, "")
+    .slice(0, 80) || "clip";
+}
+
+function _clamp(n, a, b) {
+  const x = Number(n);
+  if (!Number.isFinite(x)) return a;
+  return Math.max(a, Math.min(b, x));
+}
+
+function _encodeWav16(channelData, sampleRate) {
+  const numChannels = channelData.length;
+  const length = channelData[0]?.length || 0;
+
+  const bytesPerSample = 2;
+  const blockAlign = numChannels * bytesPerSample;
+  const byteRate = sampleRate * blockAlign;
+  const dataSize = length * blockAlign;
+
+  const buffer = new ArrayBuffer(44 + dataSize);
+  const view = new DataView(buffer);
+
+  const writeStr = (off, s) => {
+    for (let i = 0; i < s.length; i++) view.setUint8(off + i, s.charCodeAt(i));
+  };
+
+  writeStr(0, "RIFF");
+  view.setUint32(4, 36 + dataSize, true);
+  writeStr(8, "WAVE");
+  writeStr(12, "fmt ");
+  view.setUint32(16, 16, true);            // PCM
+  view.setUint16(20, 1, true);             // format = 1
+  view.setUint16(22, numChannels, true);
+  view.setUint32(24, sampleRate, true);
+  view.setUint32(28, byteRate, true);
+  view.setUint16(32, blockAlign, true);
+  view.setUint16(34, 16, true);            // bits
+  writeStr(36, "data");
+  view.setUint32(40, dataSize, true);
+
+  let offset = 44;
+  for (let i = 0; i < length; i++) {
+    for (let ch = 0; ch < numChannels; ch++) {
+      let s = channelData[ch][i] || 0;
+      s = Math.max(-1, Math.min(1, s));
+      view.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7fff, true);
+      offset += 2;
+    }
+  }
+
+  return buffer;
+}
+
+function _sliceToWavArrayBuffer(audioBuffer, offsetSec, durSec, { volume = 1, pan = 0 } = {}) {
+  const sr = audioBuffer.sampleRate;
+  const start = Math.max(0, Math.floor((offsetSec || 0) * sr));
+  const end = Math.min(audioBuffer.length, start + Math.floor((durSec || 0) * sr));
+  const sliceLen = Math.max(0, end - start);
+  if (sliceLen <= 0) return null;
+
+  volume = _clamp(volume, 0, 1.5);
+  pan = _clamp(pan, -1, 1);
+
+  // equal-power pan
+  const angle = (pan + 1) * (Math.PI / 4);
+  const gL = Math.cos(angle) * volume;
+  const gR = Math.sin(angle) * volume;
+
+  const inCh = audioBuffer.numberOfChannels || 1;
+
+  // se for mono e pan != 0, gera estéreo pra “congelar” a pan
+  const outCh = (inCh === 1 && Math.abs(pan) > 1e-6) ? 2 : inCh;
+
+  const out = new Array(outCh).fill(0).map(() => new Float32Array(sliceLen));
+
+  if (inCh === 1) {
+    const src = audioBuffer.getChannelData(0).subarray(start, end);
+    if (outCh === 1) {
+      for (let i = 0; i < sliceLen; i++) out[0][i] = src[i] * volume;
+    } else {
+      for (let i = 0; i < sliceLen; i++) {
+        out[0][i] = src[i] * gL;
+        out[1][i] = src[i] * gR;
+      }
+    }
+  } else if (inCh >= 2) {
+    const L = audioBuffer.getChannelData(0).subarray(start, end);
+    const R = audioBuffer.getChannelData(1).subarray(start, end);
+    for (let i = 0; i < sliceLen; i++) {
+      out[0][i] = L[i] * gL;
+      out[1][i] = R[i] * gR;
+    }
+    // se tiver mais canais, copia/atenua sem pan (raro)
+    for (let ch = 2; ch < outCh; ch++) {
+      const C = audioBuffer.getChannelData(ch).subarray(start, end);
+      for (let i = 0; i < sliceLen; i++) out[ch][i] = C[i] * volume;
+    }
+  }
+
+  return _encodeWav16(out, sr);
+}
+
+async function _ensureClipBuffer(clip) {
+  if (clip?.buffer) return clip.buffer;
+
+  // fallback: tenta buscar e decodificar do sourcePath
+  if (!clip?.sourcePath) return null;
+
+  const ctx = getAudioContext();
+  const res = await fetch(clip.sourcePath);
+  if (!res.ok) return null;
+
+  const arr = await res.arrayBuffer();
+  const decoded = await ctx.decodeAudioData(arr.slice(0));
+  clip.buffer = decoded;
+  return decoded;
+}
+
+// -------------------- XML: SampleTracks + zip --------------------
+
+async function applySampleTracksToXmlAndZip(xmlDoc, zip) {
+  const songTc = xmlDoc.querySelector("song > trackcontainer");
+  if (!songTc) return;
+
+  // sampletracks no LMMS são track[type="2"] e cada clipe é <sampletco> :contentReference[oaicite:4]{index=4}
+  const existingSample = songTc.querySelector(':scope > track[type="2"]');
+  const template = existingSample ? existingSample.cloneNode(true) : null;
+
+  // remove todas as sample tracks existentes e recria pelo estado atual
+  Array.from(songTc.querySelectorAll(':scope > track[type="2"]')).forEach(n => n.remove());
+
+  const secondsPerStep = getSecondsPerStep();
+  const tracks = appState.audio?.tracks || [];
+  const clips = appState.audio?.clips || [];
+
+  // recria track por lane
+  for (let i = 0; i < tracks.length; i++) {
+    const lane = tracks[i];
+    const laneName = lane?.name || `Áudio ${i + 1}`;
+
+    const trackNode = template
+      ? template.cloneNode(true)
+      : (() => {
+          const t = xmlDoc.createElement("track");
+          t.setAttribute("type", "2");
+          const st = xmlDoc.createElement("sampletrack");
+          st.setAttribute("vol", "100");
+          st.setAttribute("pan", "0");
+          t.appendChild(st);
+          return t;
+        })();
+
+    trackNode.setAttribute("type", "2");
+    trackNode.setAttribute("name", laneName);
+
+    // garante sampletrack com vol/pan neutro (vamos “bakar” no WAV por clipe)
+    let st = trackNode.querySelector("sampletrack");
+    if (!st) {
+      st = xmlDoc.createElement("sampletrack");
+      trackNode.insertBefore(st, trackNode.firstChild);
+    }
+    st.setAttribute("vol", "100");
+    st.setAttribute("pan", "0");
+
+    // limpa sampletco anteriores
+    Array.from(trackNode.querySelectorAll(":scope > sampletco")).forEach(n => n.remove());
+
+    const laneClips = clips
+      .filter(c => String(c.trackId) === String(lane.id))
+      .slice()
+      .sort((a, b) => (a.startTimeInSeconds || 0) - (b.startTimeInSeconds || 0));
+
+    for (let cidx = 0; cidx < laneClips.length; cidx++) {
+      const clip = laneClips[cidx];
+
+      const buffer = await _ensureClipBuffer(clip);
+      if (!buffer) continue;
+
+      const offsetSec = clip.offset || 0;
+      const durSec = clip.durationInSeconds || 0;
+      if (durSec <= 0.0001) continue;
+
+      const wav = _sliceToWavArrayBuffer(buffer, offsetSec, durSec, {
+        volume: clip.volume ?? 1,
+        pan: clip.pan ?? 0,
+      });
+      if (!wav) continue;
+
+      const sliceName =
+        `${_sanitizeFileName(laneName)}__${_sanitizeFileName(clip.name || "clip")}` +
+        `__${_sanitizeFileName(clip.id || String(cidx))}.wav`;
+
+      const zipPath = `samples/${sliceName}`;
+      zip.file(zipPath, wav);
+
+      // converte segundos -> ticks LMMS (12 ticks por step), inverso do seu parser :contentReference[oaicite:5]{index=5}
+      const posTicks = Math.round(((clip.startTimeInSeconds || 0) / secondsPerStep) * 12);
+      const lenTicks = Math.max(1, Math.round((durSec / secondsPerStep) * 12));
+
+      const tco = xmlDoc.createElement("sampletco");
+      tco.setAttribute("pos", String(Math.max(0, posTicks)));
+      tco.setAttribute("len", String(lenTicks));
+      tco.setAttribute("muted", String((clip.volume === 0 || clip.muted) ? 1 : 0));
+      tco.setAttribute("src", zipPath);
+
+      trackNode.appendChild(tco);
+    }
+
+    songTc.appendChild(trackNode);
+  }
+}
+
 export { generateXmlFromState as generateXmlFromStateExported };