Update server.js

server.js

@@ -1,6 +1,6 @@
 // ═══════════════════════════════════════════════════════════
-// COMPLETE UPDATED BACKEND SERVER - PART 1 OF 2
-// Fixed: Session ID issue in /mashup/create endpoint
+// COMPLETE UPDATED BACKEND SERVER
+// Version 15.0 - Added "Slowed" Effect + Improved Bass Boost
 // ═══════════════════════════════════════════════════════════
 
 const express = require('express');
@@ -74,6 +74,7 @@ const INSTRUMENTS = {
   }
 };
 
+// ✅ UPDATED EFFECTS - Added "slowed" + Improved "bass_boosted"
 const EFFECTS = {
   lofi: {
     name: "LoFi Hip Hop",
@@ -82,6 +83,16 @@ const EFFECTS = {
     instrumentVolume: 0,
     instrumentMoods: ["chill", "sad_romantic", "ambient"]
   },
+  
+  // ✅ NEW: Simple Slowed Effect (just makes song slower, no reverb)
+  slowed: {
+    name: "Slowed",
+    description: "Just slowed down - pure slow tempo (No instruments, no reverb)",
+    baseCommand: `atempo=0.80,asetrate=44100*0.90,aresample=44100,equalizer=f=800:t=q:width=2:g=1.5,highpass=f=35,lowpass=f=14000,volume=1.15`,
+    instrumentVolume: 0,
+    instrumentMoods: []
+  },
+  
   slowed_reverb: {
     name: "Slowed + Reverb",
     description: "Simple & authentic - like YouTube/TikTok (clean vocals, no instruments)",
@@ -89,6 +100,7 @@ const EFFECTS = {
     instrumentVolume: 0,
     instrumentMoods: []
   },
+  
   nightcore: {
     name: "Nightcore",
     description: "High energy with bright sparkling sounds (With Instruments)",
@@ -96,6 +108,7 @@ const EFFECTS = {
     instrumentVolume: 0.04,
     instrumentMoods: ["upbeat", "romantic"]
   },
+  
   vaporwave: {
     name: "Vaporwave",
     description: "Retro nostalgic with dreamy sad vibes (With Instruments)",
@@ -103,6 +116,7 @@ const EFFECTS = {
     instrumentVolume: 0.005,
     instrumentMoods: ["sad_romantic", "ambient", "sad"]
   },
+  
   "8d_audio": {
     name: "8D Audio",
     description: "Immersive 360° with ambient dreamy layers (With Instruments)",
@@ -110,13 +124,16 @@ const EFFECTS = {
     instrumentVolume: 0.05,
     instrumentMoods: ["ambient", "romantic", "sad_romantic"]
   },
+  
+  // ✅ IMPROVED: Bass Boosted (smooth transitions, no noise, dynamic pulsing)
   bass_boosted: {
     name: "Bass Boosted",
-    description: "Heavy bass with deep atmospheric tones (With Instruments)",
-    baseCommand: `bass=g=18:f=55:width_type=o:width=1.5,bass=g=14:f=95:width_type=h:width=90,equalizer=f=35:t=q:width=1.2:g=12,equalizer=f=75:t=q:width=1.5:g=10,equalizer=f=140:t=q:width=2:g=8,equalizer=f=500:t=q:width=2:g=-3,equalizer=f=4000:t=q:width=4:g=-6,acompressor=threshold=-22dB:ratio=8:attack=3:release=40:makeup=8,tremolo=f=0.15:d=0.3,highpass=f=28,alimiter=limit=0.95:attack=5:release=50,volume=1.5`,
+    description: "Smooth heavy bass with pulsing rhythm (Clean, no distortion)",
+    baseCommand: `bass=g=16:f=50:width_type=o:width=1.8,bass=g=12:f=90:width_type=h:width=100,equalizer=f=35:t=q:width=1:g=10,equalizer=f=70:t=q:width=1.5:g=8,equalizer=f=130:t=q:width=2:g=6,equalizer=f=450:t=q:width=2:g=-2.5,equalizer=f=3500:t=q:width=3.5:g=-4.5,acompressor=threshold=-24dB:ratio=6:attack=4:release=60:makeup=6,apulsator=hz=0.18:mode=sine:width=0.6,highpass=f=25,alimiter=limit=0.92:attack=6:release=65,volume=1.45`,
     instrumentVolume: 0.05,
     instrumentMoods: ["ambient", "chill"]
   },
+  
   ambient: {
     name: "Ambient Chill",
     description: "Ethereal meditation with sad peaceful vibes (With Instruments)",
@@ -469,35 +486,32 @@ async function matchTempo(inputPath, targetBPM, currentBPM, identifier) {
     return inputPath;
   }
 }
-// ═══════════════════════════════════════════════════════════
-// COMPLETE UPDATED BACKEND SERVER - PART 2 OF 2
-// Copy Part 1 + Part 2 together into one server.js file
-// ═══════════════════════════════════════════════════════════
 
 // API ENDPOINTS
 
 app.get('/', (req, res) => {
   res.json({
     status: 'online',
-    message: '🎵 Unified Mashup API v14.0 - SIMPLE SLOWED+REVERB',
-    version: '14.0',
+    message: '🎵 Unified Mashup API v15.0 - NEW SLOWED EFFECT',
+    version: '15.0',
     features: [
       '🎭 Smart Genre Detection (8 genres)',
       '🎬 CapCut-style Timeline Editor',
-      '🎨 LoFi Effects (7 effects)',
+      '🎨 8 Audio Effects (NEW: Pure Slowed)',
       '🔀 Natural Crossfade',
-      '🎹 Smart Instrument Mixing (NOT in LoFi/Slowed+Reverb)',
+      '🎹 Smart Instrument Mixing',
       '🎵 BPM Detection & Tempo Matching',
       '🎯 Genre Compatibility Check',
       '📊 Frequency Spectrum Analysis',
       '✂️ Precise Clip Trimming',
       '🔊 Volume Control per Clip',
-      '🔥 SIMPLE Slowed+Reverb (Like YouTube/TikTok - Clean & Fast)',
+      '🔥 NEW: Pure Slowed Effect (just slow tempo)',
+      '🎚️ IMPROVED: Clean Bass Boost (smooth pulsing)',
       '❌ Zero Quality Loss'
     ],
     total_effects: Object.keys(EFFECTS).length,
     total_instruments: Object.keys(INSTRUMENTS).length,
-    note: 'Slowed+Reverb is now SIMPLE - no complex analysis, just clean authentic sound like YouTube/TikTok!'
+    note: 'NEW: Slowed effect added! Bass boost improved for smooth transitions!'
   });
 });
 
@@ -518,7 +532,8 @@ app.get('/effects', (req, res) => {
       description: EFFECTS[key].description,
       moods: EFFECTS[key].instrumentMoods || [],
       hasInstruments: EFFECTS[key].instrumentVolume > 0,
-      isSimple: key === 'slowed_reverb'
+      isNew: key === 'slowed',
+      isImproved: key === 'bass_boosted'
     }))
   });
 });
@@ -564,7 +579,27 @@ app.post('/process', upload.single('audio'), async (req, res) => {
     let usedInstruments = [];
     let analysisDetails = null;
     
-    if (effectType === 'slowed_reverb') {
+    // ✅ Handle "slowed" effect (NEW)
+    if (effectType === 'slowed') {
+      console.log('\n🐌 Applying PURE SLOWED effect...');
+      console.log('   Speed: 80% (perfect slow)');
+      console.log('   Pitch: 90% (deeper tone)');
+      console.log('   NO REVERB, NO INSTRUMENTS');
+      console.log('   Just pure slowed tempo');
+      
+      ffmpegCommand = `ffmpeg -i "${inputPath}" -threads 0 -af "${effect.baseCommand}" -ar 44100 -b:a 192k -preset ultrafast -y "${outputPath}"`;
+      
+      analysisDetails = {
+        description: 'Pure slowed tempo',
+        speed: '80% (slower than slowed+reverb)',
+        pitch: '90% (deeper voice)',
+        reverb: 'NONE',
+        instruments: 'NONE',
+        quality: 'Simple & Clean - Just Slow'
+      };
+    }
+    // ✅ Handle "slowed_reverb" effect
+    else if (effectType === 'slowed_reverb') {
       console.log('\n🔥 Applying SIMPLE Slowed + Reverb (YouTube/TikTok style)...');
       console.log('   Speed: 85% (perfect slow)');
       console.log('   Pitch: 92% (deep voice)');
@@ -583,7 +618,55 @@ app.post('/process', upload.single('audio'), async (req, res) => {
         instruments: 'NONE',
         quality: 'YouTube/TikTok style - Clean & Professional'
       };
-    } else {
+    }
+    // ✅ Handle "bass_boosted" effect (IMPROVED)
+    else if (effectType === 'bass_boosted') {
+      console.log('\n🔊 Applying IMPROVED BASS BOOST...');
+      console.log('   Bass: Heavy but clean (16dB @ 50Hz)');
+      console.log('   Pulsing: Smooth rhythm (0.18Hz sine wave)');
+      console.log('   Compression: Dynamic & artifact-free');
+      console.log('   NO NOISE, NO DISTORTION');
+      
+      if (addInstruments && effect.instrumentVolume > 0) {
+        const selectedKeys = getSmartInstruments(effectType, 2);
+        usedInstruments = selectedKeys.map(key => ({
+          id: key,
+          name: INSTRUMENTS[key].name,
+          mood: INSTRUMENTS[key].mood
+        }));
+        
+        console.log(`🎹 Instruments: ${usedInstruments.map(i => i.name).join(', ')}`);
+        
+        const timestamp = Date.now();
+        const inst1Path = path.join(outputsDir, `inst1-${timestamp}.wav`);
+        const inst2Path = path.join(outputsDir, `inst2-${timestamp}.wav`);
+        
+        await execPromise(`ffmpeg -f lavfi -i "${INSTRUMENTS[selectedKeys[0]].command}" -t 12 -ar 44100 -y "${inst1Path}"`);
+        await execPromise(`ffmpeg -f lavfi -i "${INSTRUMENTS[selectedKeys[1]].command}" -t 12 -ar 44100 -y "${inst2Path}"`);
+        
+        const vol = effect.instrumentVolume;
+        ffmpegCommand = `ffmpeg -i "${inputPath}" -stream_loop -1 -i "${inst1Path}" -stream_loop -1 -i "${inst2Path}" -filter_complex "[0:a]volume=3.5[main];[1:a]volume=${vol}[i1];[2:a]volume=${vol}[i2];[main][i1][i2]amix=inputs=3:duration=first:dropout_transition=2:weights=15 0.5 0.5,${effect.baseCommand}" -ar 44100 -b:a 192k -preset ultrafast -threads 0 -y "${outputPath}"`;
+        
+        setTimeout(() => {
+          [inst1Path, inst2Path].forEach(p => {
+            if (fs.existsSync(p)) fs.unlinkSync(p);
+          });
+        }, 5000);
+      } else {
+        console.log('⏭️  Instruments skipped for this effect');
+        ffmpegCommand = `ffmpeg -i "${inputPath}" -threads 0 -af "${effect.baseCommand}" -ar 44100 -b:a 192k -preset ultrafast -y "${outputPath}"`;
+      }
+      
+      analysisDetails = {
+        description: 'Smooth heavy bass with pulsing',
+        bass: 'Deep & powerful (16dB @ 50Hz, 12dB @ 90Hz)',
+        pulsing: 'Smooth sine wave rhythm (0.18Hz)',
+        compression: 'Dynamic (6:1 ratio, clean transitions)',
+        quality: 'No noise, no distortion - Pure bass'
+      };
+    }
+    // ✅ Handle other effects
+    else {
       if (addInstruments && effect.instrumentVolume > 0) {
         const selectedKeys = getSmartInstruments(effectType, 2);
         usedInstruments = selectedKeys.map(key => ({
@@ -638,7 +721,8 @@ app.post('/process', upload.single('audio'), async (req, res) => {
         description: effect.description,
         moods: effect.instrumentMoods || [],
         hasInstruments: effect.instrumentVolume > 0,
-        isSimple: effectType === 'slowed_reverb'
+        isNew: effectType === 'slowed',
+        isImproved: effectType === 'bass_boosted'
       },
       instruments: usedInstruments,
       output: { 
@@ -650,7 +734,6 @@ app.post('/process', upload.single('audio'), async (req, res) => {
     
     if (analysisDetails) {
       response.analysis = analysisDetails;
-      response.message = `${response.message} (Simple & clean - YouTube/TikTok style)`;
     }
     
     console.log('\n═══════════════════════════════════════════════════════════');
@@ -798,13 +881,9 @@ app.post('/mashup/analyze/:sessionId', async (req, res) => {
   }
 });
 
-// ═══════════════════════════════════════════════════════════
-// ✅ FIXED /mashup/create ENDPOINT - Session ID Issue Fixed
-// ═══════════════════════════════════════════════════════════
 app.post('/mashup/create', async (req, res) => {
   const tempFiles = [];
   try {
-    // ✅ FIX: Support both session_id (snake_case) and sessionId (camelCase)
     const { session_id, sessionId, arrangement, theme, transitions, forceCreate } = req.body;
     const actualSessionId = session_id || sessionId;
     
@@ -1057,15 +1136,15 @@ setInterval(() => {
 
 app.listen(PORT, '0.0.0.0', () => {
   console.log('\n═══════════════════════════════════════════════════════════');
-  console.log('🎵 UNIFIED MASHUP API v14.0 - FIXED SESSION ID');
+  console.log('🎵 UNIFIED MASHUP API v15.0 - NEW SLOWED EFFECT');
   console.log('═══════════════════════════════════════════════════════════');
   console.log(`📍 Server: http://0.0.0.0:${PORT}`);
   console.log('');
-  console.log('🔥 FEATURES:');
+  console.log('🔥 NEW FEATURES:');
   console.log('═══════════════════════════════════════════════════════════');
-  console.log('✅ Session ID bug FIXED (supports both formats)');
-  console.log('✅ Simple Slowed+Reverb (YouTube/TikTok style)');
-  console.log('✅ 7 Audio Effects with smart instruments');
+  console.log('✅ NEW: Pure "Slowed" effect (just slow tempo)');
+  console.log('✅ IMPROVED: Clean Bass Boost (smooth pulsing)');
+  console.log('✅ 8 Total effects with smart instruments');
   console.log('✅ Genre detection & compatibility check');
   console.log('✅ Timeline mashup editor');
   console.log('');
@@ -1073,10 +1152,23 @@ app.listen(PORT, '0.0.0.0', () => {
   console.log('═══════════════════════════════════════════════════════════');
   console.log('GET  / - API Info');
   console.log('GET  /health - Health Check');
+  console.log('GET  /effects - List all effects (includes new slowed)');
   console.log('POST /process - Single song processing');
   console.log('POST /mashup/upload - Upload 2 songs');
   console.log('POST /mashup/analyze/:sessionId - Analyze');
-  console.log('POST /mashup/create - Create mashup ✅ FIXED');
+  console.log('POST /mashup/create - Create mashup');
   console.log('GET  /download/:filename - Download');
+  console.log('═══════════════════════════════════════════════════════════');
+  console.log('');
+  console.log('🎨 AVAILABLE EFFECTS:');
+  console.log('═══════════════════════════════════════════════════════════');
+  console.log('1. lofi - LoFi Hip Hop');
+  console.log('2. slowed 🆕 - Pure Slowed (just slow tempo)');
+  console.log('3. slowed_reverb - Slowed + Reverb');
+  console.log('4. nightcore - Nightcore');
+  console.log('5. vaporwave - Vaporwave');
+  console.log('6. 8d_audio - 8D Audio');
+  console.log('7. bass_boosted ⭐ - Bass Boost (IMPROVED)');
+  console.log('8. ambient - Ambient Chill');
   console.log('═══════════════════════════════════════════════════════════\n');
 });