new analyzer

bin/LoopbackCapture.cs

@@ -1,6 +1,12 @@
+// Exit codes: 0 = clean exit / parent ended; 2 = no render endpoint;
+// 3 = instance already running; 4 = WASAPI initialization failed;
+// 5 = unhandled exception / persistent capture error;
+// 6 = lease expired (Godot is not responding).
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Globalization;
+using System.IO;
 using System.Net;
 using System.Net.Sockets;
 using System.Runtime.InteropServices;
@@ -9,14 +15,423 @@ using System.Threading;
 
 namespace LoopbackCapture
 {
+    // Independent analysis branch: never writes to RMS/onset/BPM detector state.
+    sealed class RuleGenreAnalyzer
+    {
+        // TUNING TABLE: initial heuristics, NOT calibrated probabilities. Adjust here.
+        const int FftSize = 2048, ShortHops = 400, RhythmHops = 1600;
+        const int DynamicsSamples = 160, DynamicsHopCount = 10, MinDynamicsSamples = 40;
+        const int MinBars = 4, MinPeaks = 4;
+        const double FeatureAlpha = 0.05, Temperature = 0.20, ConfidenceThreshold = 0.30;
+        const double BandMinHz = 100, BandMaxHz = 8000, HighHz = 2000;
+        const double LowMinHz = 40, LowMaxHz = 120, MidMinHz = 200, MidMaxHz = 5000;
+        const double CentroidMinHz = 500, CentroidMaxHz = 4000;
+        const double FlatnessMin = 0.02, FlatnessMax = 0.50;
+        const double HighRatioMin = 0.05, HighRatioMax = 0.60, LowRatioMin = 0.05, LowRatioMax = 0.50;
+        const double DensityMax = 8, DynamicsMinDb = 6, DynamicsMaxDb = 24;
+        const double LatinMinBpm = 85, LatinMaxBpm = 105, ElectronicMinBpm = 115, ElectronicMaxBpm = 135;
+        const double HipHopMinBpm = 80, HipHopMaxBpm = 95, TempoShoulderBpm = 15;
+        // Il dembow e' una firma discreta, non un contributo lineare: sopra soglia sposta
+        // la decisione, sotto soglia non tocca nulla. Richiede anche affinita' di tempo
+        // >= 0.5, altrimenti una sincope qualsiasi a 130 BPM verrebbe promossa a latin.
+        // La soglia lavora sul dembow NORMALIZZATO (vedi DembowBaseline).
+        const double DembowGate = 0.40, DembowBonus = 0.35;
+        // Un istogramma uniforme correla gia' 7/16 con un template che ha 7 caselle attive
+        // su 16. Senza togliere questo pavimento, qualsiasi ritmo piatto (rock con piatti
+        // ovunque) ottiene ~0.44 e passa per un dembow debole.
+        const double DembowBaseline = 7.0 / 16.0;
+        // Il rilevatore puo' agganciare la cella 3+3+2 e riportare 4/3 del battito.
+        // Si prova anche l'ipotesi 3/4 e si tiene quella che spiega meglio il pattern.
+        const double FoldMargin = 0.05, MinFoldBpm = 50;
+        static readonly double[] FoldFactors = { 1.0, 0.75, 1.25 };
+        const double RegularityCenter = 0.50, RegularityWidth = 0.50;
+        const double PeakSigma = 1, PowerEpsilon = 1e-20, RmsFloor = 1e-6, ActiveRms = 1e-5;
+        const int PublishMs = 1000, StaleMs = 1000;
+        // Columns: dembow, fourFloor, tempo affinity, low, flatness, high, density,
+        // centroid, regularity, medium regularity, dynamics. Negative = inhibitory.
+        // Each row has total absolute weight 1; Bias implements rewarded complements.
+        // Scores include Bias, then stable softmax(score / Temperature).
+        static readonly string[] Labels = { "latin", "electronic", "hiphop", "rock", "classical" };
+        // Pesi derivati dalla distanza di Fisher misurata su dati reali etichettati
+        // (tests\rock2.csv, classic.csv, hiphop.csv). Le feature sono quasi ortogonali:
+        //   flatness/highRatio separano classical da {rock, hiphop} ma NON rock da hiphop (d'~0.03);
+        //   regularity/regMid/dynamics separano rock da hiphop ma non rock da classical.
+        // density non discrimina nessuna delle tre coppie (d' 0.14-0.45): peso azzerato.
+        // I Bias NON sono scelti a mano: sono il valore che porta ogni classe a 0 sulla media
+        // globale delle feature (bias_c = -w_c . mean). Senza questa compensazione una classe
+        // diventa il "vincitore per default" e ogni ritaratura sposta il problema su un'altra.
+        static readonly double[] Bias = { -0.273, -0.119, -0.197, 0.018, 0.191 };
+        static readonly double[,] Weights = {
+            { 0.50, 0, 0.25, 0.25, 0, 0, 0, 0, 0, 0, 0 },
+            { 0, 0.35, 0.25, 0.15, 0, 0, 0, 0, 0.25, 0, 0 },
+            { 0, 0, 0, 0.15, 0, 0, 0, 0, 0.20, 0.35, 0.30 },
+            { 0, 0, 0, 0, 0.25, 0.15, 0, 0, -0.20, -0.25, -0.15 },
+            { 0, 0, 0, 0, -0.40, -0.45, 0, 0, 0, 0, 0.15 }
+        };
+        static readonly int[] DembowTemplate = { 1,0,0,1,0,0,1,0,1,0,0,1,0,0,1,0 };
+        readonly int rate, hop;
+        readonly double[] samples = new double[FftSize], hann = new double[FftSize];
+        readonly double[] real = new double[FftSize], imag = new double[FftSize];
+        readonly double[] cos = new double[FftSize / 2], sin = new double[FftSize / 2];
+        readonly int[] reverse = new int[FftSize];
+        readonly double[] previousPower = new double[FftSize / 2 + 1];
+        readonly double[] shortOnset = new double[ShortHops], rhythm = new double[RhythmHops];
+        readonly double[] envelope = new double[ShortHops], folded = new double[16];
+        readonly double[] dynamics = new double[DynamicsSamples], sortedDynamics = new double[DynamicsSamples];
+        readonly double[] features = new double[11], probabilities = new double[5];
+        int write, filled, hopFrames, shortHead, shortCount, rhythmHead, rhythmCount;
+        int dynamicsHead, dynamicsCount, dynamicsHops, dynamicsFrames;
+        double dynamicsSum, recentRms, centroid, flatness, highRatio, lowRatio;
+        double dembow, fourFloor, density, regularity, dynamicRange;
+        bool spectrumReady, dynamicReady;
+        long lastDataMs = -1, lastPublishMs;
+        StreamWriter dump;
+        public double DembowPhase { get; private set; }
+        // Tempo effettivamente usato per il folding: puo' essere i 3/4 di quello rilevato
+        // se il pattern dimostra che il detector ha agganciato la cella 3+3+2.
+        public double EffectiveBpm { get; private set; }
+
+        public RuleGenreAnalyzer(int sampleRate, int hopSize, string dumpPath)
+        {
+            rate = sampleRate; hop = hopSize;
+            for (int i = 0; i < FftSize; i++)
+            {
+                hann[i] = 0.5 - 0.5 * Math.Cos(2 * Math.PI * i / (FftSize - 1));
+                int x = i, r = 0;
+                for (int b = 0; b < 11; b++) { r = (r << 1) | (x & 1); x >>= 1; }
+                reverse[i] = r;
+            }
+            for (int i = 0; i < cos.Length; i++)
+            {
+                cos[i] = Math.Cos(-2 * Math.PI * i / FftSize);
+                sin[i] = Math.Sin(-2 * Math.PI * i / FftSize);
+            }
+            if (!string.IsNullOrEmpty(dumpPath))
+            {
+                try
+                {
+                    dump = new StreamWriter(dumpPath, false, Encoding.UTF8);
+                    dump.WriteLine("ms,bpm,dembow,fourfloor,density,flatness,centroid,regularity,highRatio,lowRatio,label,conf,f0_latin_dembow,f1_fourfloor,f2_tempo_latin,f3_low,f4_flat,f5_high,f6_density,f7_centroid,f8_reg,f9_regmid,f10_dyn,s_latin,s_electronic,s_hiphop,s_rock,s_classical");
+                    dump.Flush();
+                }
+                catch (Exception ex) { DisableDump(ex); }
+            }
+        }
+
+        void DisableDump(Exception ex)
+        {
+            Console.Error.WriteLine("Feature dump disabled: " + ex.Message);
+            if (dump != null) { try { dump.Dispose(); } catch { } dump = null; }
+        }
+
+        public void MarkData(long now) { lastDataMs = now; }
+
+        // Il folding ritmico dipende dal tempo: se il BPM cambia (nuovo brano), la storia
+        // gia' registrata e' su una griglia che non corrisponde piu'. Va scartata, altrimenti
+        // per fino a 16 s si pubblica un dembow/fourFloor casuale.
+        public void ResetRhythm()
+        {
+            rhythmHead = 0;
+            rhythmCount = 0;
+            Array.Clear(rhythm, 0, rhythm.Length);
+            dembow = 0;
+            fourFloor = 0;
+            DembowPhase = 0;
+        }
+
+        // Errore di ottava del rilevatore: 85 BPM puo' uscire 170, 195 puo' uscire 97.5.
+        // Riporta il tempo in [70,145) prima di applicare sia i template di tempo sia il
+        // folding ritmico. Senza questa normalizzazione nessuna regola di tempo entra in
+        // gioco (LatinMin 85, HipHopMin 80) e vince sempre la classe senza termine ritmico.
+        public static double CanonicalTempo(double bpm)
+        {
+            if (bpm <= 0) return 0;
+            while (bpm >= 145.0) bpm /= 2.0;
+            while (bpm < 70.0) bpm *= 2.0;
+            return bpm;
+        }
+
+        public void AddSample(float value)
+        {
+            double v = float.IsNaN(value) || float.IsInfinity(value) ? 0 : value;
+            samples[write] = v; write = (write + 1) % FftSize;
+            if (filled < FftSize) filled++;
+            dynamicsSum += v * v; dynamicsFrames++;
+            if (++hopFrames < hop) return;
+            hopFrames = 0;
+            double flux = filled == FftSize ? Spectrum() : 0;
+            shortOnset[shortHead] = flux; shortHead = (shortHead + 1) % ShortHops;
+            shortCount = Math.Min(shortCount + 1, ShortHops);
+            rhythm[rhythmHead] = flux; rhythmHead = (rhythmHead + 1) % RhythmHops;
+            rhythmCount = Math.Min(rhythmCount + 1, RhythmHops);
+            if (++dynamicsHops >= DynamicsHopCount)
+            {
+                recentRms = Math.Sqrt(dynamicsSum / Math.Max(1, dynamicsFrames));
+                dynamics[dynamicsHead] = 20 * Math.Log10(Math.Max(RmsFloor, recentRms));
+                dynamicsHead = (dynamicsHead + 1) % DynamicsSamples;
+                dynamicsCount = Math.Min(dynamicsCount + 1, DynamicsSamples);
+                dynamicsSum = 0; dynamicsFrames = 0; dynamicsHops = 0;
+            }
+        }
+
+        // Real input, radix-2 complex workspace; only nonnegative frequency bins used.
+        // All FFT/window/twiddle/history arrays are preallocated and reused per hop.
+        double Spectrum()
+        {
+            for (int i = 0; i < FftSize; i++)
+            {
+                real[reverse[i]] = samples[(write + i) % FftSize] * hann[i];
+                imag[reverse[i]] = 0;
+            }
+            for (int size = 2; size <= FftSize; size <<= 1)
+            {
+                int half = size / 2, stride = FftSize / size;
+                for (int start = 0; start < FftSize; start += size)
+                    for (int j = 0; j < half; j++)
+                    {
+                        int a = start + j, b = a + half, t = j * stride;
+                        double tr = cos[t] * real[b] - sin[t] * imag[b];
+                        double ti = sin[t] * real[b] + cos[t] * imag[b];
+                        real[b] = real[a] - tr; imag[b] = imag[a] - ti;
+                        real[a] += tr; imag[a] += ti;
+                    }
+            }
+            double total = 0, band = 0, weighted = 0, logs = 0, high = 0, low = 0, flux = 0;
+            int bins = 0;
+            for (int k = 0; k <= FftSize / 2; k++)
+            {
+                double hz = k * (double)rate / FftSize;
+                double p = (real[k] * real[k] + imag[k] * imag[k]) / (FftSize * (double)FftSize);
+                // One-sided power: DC/Nyquist occur once, other bins twice.
+                if (k > 0 && k < FftSize / 2) p *= 2;
+                total += p;
+                if (hz >= BandMinHz && hz <= BandMaxHz)
+                { band += p; weighted += hz * p; logs += Math.Log(Math.Max(PowerEpsilon, p)); bins++; }
+                if (hz > HighHz) high += p;
+                if (hz >= LowMinHz && hz <= LowMaxHz) low += p;
+                if (hz >= MidMinHz && hz <= MidMaxHz && spectrumReady)
+                    flux += Math.Max(0, p - previousPower[k]);
+                previousPower[k] = p;
+            }
+            double smoothing = spectrumReady ? FeatureAlpha : 1;
+            centroid += smoothing * ((band > PowerEpsilon ? weighted / band : 0) - centroid);
+            flatness += smoothing * ((band > PowerEpsilon && bins > 0 ? Clamp(Math.Exp(logs / bins) / (band / bins)) : 0) - flatness);
+            highRatio += smoothing * ((total > PowerEpsilon ? high / total : 0) - highRatio);
+            lowRatio += smoothing * ((total > PowerEpsilon ? low / total : 0) - lowRatio);
+            spectrumReady = true;
+            return flux;
+        }
+
+        static double Clamp(double x) { return Math.Max(0, Math.Min(1, x)); }
+        static double Normalize(double x, double min, double max) { return Clamp((x - min) / (max - min)); }
+        static double Tempo(double bpm, double min, double max)
+        { return bpm <= 0 ? 0 : Clamp(1 - Math.Max(min - bpm, Math.Max(0, bpm - max)) / TempoShoulderBpm); }
+
+        void RhythmFeatures(double bpm)
+        {
+            double maximum = PowerEpsilon;
+            for (int i = 0; i < shortCount; i++)
+            {
+                envelope[i] = shortOnset[(shortHead - shortCount + i + ShortHops) % ShortHops];
+                maximum = Math.Max(maximum, envelope[i]);
+            }
+            double mean = 0, variance = 0;
+            for (int i = 0; i < shortCount; i++) { envelope[i] /= maximum; mean += envelope[i]; }
+            mean /= Math.Max(1, shortCount);
+            for (int i = 0; i < shortCount; i++) variance += (envelope[i] - mean) * (envelope[i] - mean);
+            double threshold = mean + PeakSigma * Math.Sqrt(variance / Math.Max(1, shortCount));
+            int peaks = 0, lastPeak = -1, intervals = 0;
+            double sum = 0, squares = 0;
+            for (int i = 1; i < shortCount - 1; i++)
+                if (envelope[i] > threshold && envelope[i] > envelope[i - 1] && envelope[i] >= envelope[i + 1])
+                {
+                    peaks++;
+                    if (lastPeak >= 0) { double d = i - lastPeak; sum += d; squares += d * d; intervals++; }
+                    lastPeak = i;
+                }
+            // Available duration during warm-up; exactly 4 s once the 400-slot ring is full.
+            density = peaks / Math.Max(0.01, shortCount / 100.0);
+            regularity = peaks < MinPeaks ? 0 : 1 - Clamp(Math.Sqrt(Math.Max(0, squares / intervals - Math.Pow(sum / intervals, 2))) / (sum / intervals));
+            dembow = 0; fourFloor = 0; DembowPhase = 0;
+            EffectiveBpm = 0;
+            if (bpm <= 0) return;
+
+            // Il pattern 3+3+2 crea periodicita' spurie a 4/3 e a 5/4 del battito: il
+            // detector puo' agganciare una cella invece del battito (95 BPM letti 127 o 76).
+            // Non lo si decide a priori: vince l'ipotesi che correla meglio col template.
+            double bestD = 0, bestF = 0, bestP = 0, bestT = 0;
+            bool found = false;
+            for (int h = 0; h < FoldFactors.Length; h++)
+            {
+                double d, f, p;
+                if (!Fold(bpm * FoldFactors[h], out d, out f, out p)) continue;
+                if (!found || d > bestD + FoldMargin)
+                {
+                    bestD = d; bestF = f; bestP = p; bestT = bpm * FoldFactors[h];
+                    found = true;
+                }
+            }
+            if (found) { dembow = bestD; fourFloor = bestF; DembowPhase = bestP; EffectiveBpm = bestT; }
+        }
+
+        bool Fold(double bpm, out double dembowScore, out double fourFloorScore, out double phaseScore)
+        {
+            dembowScore = 0; fourFloorScore = 0; phaseScore = 0;
+            if (bpm < MinFoldBpm) return false;
+            double hopPerBeat = 60 / bpm * 100, barHops = hopPerBeat * 4;
+            int bars = (int)Math.Floor(rhythmCount / barHops);
+            if (bars < MinBars) return false;
+            int count = (int)Math.Floor(bars * barHops);
+            Array.Clear(folded, 0, folded.Length);
+            double maximum = PowerEpsilon;
+            for (int i = 0; i < count; i++) maximum = Math.Max(maximum, rhythm[(rhythmHead - count + i + RhythmHops) % RhythmHops]);
+            for (int i = 0; i < count; i++)
+                folded[((int)Math.Floor(i / hopPerBeat * 4)) % 16] += rhythm[(rhythmHead - count + i + RhythmHops) % RhythmHops] / maximum / bars;
+            double sum = 0;
+            for (int i = 0; i < 16; i++) sum += folded[i];
+            if (sum <= PowerEpsilon) return false;
+            for (int i = 0; i < 16; i++) folded[i] /= sum;
+            for (int phase = 0; phase < 16; phase++)
+            {
+                double correlation = 0;
+                for (int i = 0; i < 16; i++) correlation += folded[(i + phase) % 16] * DembowTemplate[i];
+                // Unit-sum folded envelope, binary template: theoretical maximum dot = 1.
+                if (correlation > dembowScore) { dembowScore = Clamp(correlation); phaseScore = phase / 16.0; }
+                double mass = 0, weakest = 1;
+                for (int q = 0; q < 4; q++)
+                { double v = folded[(phase + 4 * q) % 16]; mass += v; weakest = Math.Min(weakest, v); }
+                // quarterMass * (weakest / meanQuarter): penalizes missing quarters.
+                // Uniform 16 bins => .25; four equal quarter hits => 1; missing hit => 0.
+                double floor = mass > 0 ? mass * Clamp(weakest / (mass / 4)) : 0;
+                fourFloorScore = Math.Max(fourFloorScore, Clamp(floor));
+            }
+            // Rimuove il pavimento del 7/16: 0 = nessuna informazione ritmica, 1 = dembow pieno.
+            dembowScore = Clamp((dembowScore - DembowBaseline) / (1 - DembowBaseline));
+            return true;
+        }
+
+        double Percentile(double fraction)
+        {
+            double index = (dynamicsCount - 1) * fraction;
+            int lo = (int)index, hi = Math.Min(lo + 1, dynamicsCount - 1);
+            return sortedDynamics[lo] + (sortedDynamics[hi] - sortedDynamics[lo]) * (index - lo);
+        }
+
+        public void Publish(long now, double bpm, UdpClient udp, IPEndPoint destination)
+        {
+            if (now - lastPublishMs < PublishMs) return;
+            lastPublishMs = now;
+            bool fresh = lastDataMs >= 0 && now - lastDataMs <= StaleMs;
+            RhythmFeatures(bpm);
+            // Il termine di tempo usa il BPM che ha vinto il confronto di folding,
+            // non quello grezzo del rilevatore.
+            double tempo = EffectiveBpm > 0 ? EffectiveBpm : bpm;
+            dynamicReady = dynamicsCount >= MinDynamicsSamples;
+            dynamicRange = 0;
+            if (dynamicReady)
+            {
+                Array.Copy(dynamics, sortedDynamics, dynamicsCount);
+                Array.Sort(sortedDynamics, 0, dynamicsCount);
+                dynamicRange = Percentile(0.90) - Percentile(0.10);
+            }
+            features[0] = dembow; features[1] = fourFloor;
+            features[3] = Normalize(lowRatio, LowRatioMin, LowRatioMax);
+            features[4] = Normalize(flatness, FlatnessMin, FlatnessMax);
+            features[5] = Normalize(highRatio, HighRatioMin, HighRatioMax);
+            features[6] = Normalize(density, 0, DensityMax);
+            features[7] = Normalize(centroid, CentroidMinHz, CentroidMaxHz);
+            features[8] = regularity;
+            features[9] = Clamp(1 - Math.Abs(regularity - RegularityCenter) / RegularityWidth);
+            features[10] = dynamicReady ? Normalize(dynamicRange, DynamicsMinDb, DynamicsMaxDb) : 0;
+            double maxScore = double.NegativeInfinity;
+            double[] rawScores = new double[Labels.Length];
+            for (int c = 0; c < Labels.Length; c++)
+            {
+                features[2] = c == 0 ? Tempo(tempo, LatinMinBpm, LatinMaxBpm) : c == 1 ? Tempo(tempo, ElectronicMinBpm, ElectronicMaxBpm) : c == 2 ? Tempo(tempo, HipHopMinBpm, HipHopMaxBpm) : 0;
+                double score = Bias[c];
+                for (int j = 0; j < features.Length; j++) score += features[j] * Weights[c, j];
+                // Dembow come soglia, non come peso: un pattern 3+3+2 riconosciuto vale
+                // piu' di un contributo lineare, ma solo se il tempo e' compatibile.
+                if (c == 0 && dembow >= DembowGate && Tempo(tempo, LatinMinBpm, LatinMaxBpm) >= 0.5)
+                    score += DembowBonus;
+                probabilities[c] = score;
+                rawScores[c] = score;
+                maxScore = Math.Max(maxScore, score);
+            }
+            double total = 0;
+            bool active = fresh && recentRms >= ActiveRms && shortCount >= ShortHops;
+            for (int c = 0; c < Labels.Length; c++)
+            { probabilities[c] = active ? Math.Exp((probabilities[c] - maxScore) / Temperature) : 1; total += probabilities[c]; }
+            for (int c = 0; c < Labels.Length; c++)
+                probabilities[c] /= total;
+            int best = 0;
+            for (int c = 1; c < Labels.Length; c++) if (probabilities[c] > probabilities[best]) best = c;
+            string label = probabilities[best] < ConfidenceThreshold ? "unknown" : Labels[best];
+            StringBuilder packet = new StringBuilder();
+            packet.AppendFormat(CultureInfo.InvariantCulture, "GENR:1;{0};{1:F3}", label, probabilities[best]);
+            for (int c = 0; c < Labels.Length; c++) packet.AppendFormat(CultureInfo.InvariantCulture, ";{0}={1:F3}", Labels[c], probabilities[c]);
+            try { byte[] bytes = Encoding.UTF8.GetBytes(packet.ToString()); udp.Send(bytes, bytes.Length, destination); } catch { }
+            if (dump != null)
+            {
+                try
+                {
+                    StringBuilder row = new StringBuilder();
+                    row.AppendFormat(CultureInfo.InvariantCulture,
+                        "{0},{1:F3},{2:F3},{3:F3},{4:F3},{5:F6},{6:F3},{7:F3},{8:F6},{9:F6},{10},{11:F3}",
+                        now, tempo, fresh ? dembow : 0, fresh ? fourFloor : 0, fresh ? density : 0,
+                        fresh ? flatness : 0, fresh ? centroid : 0, fresh ? regularity : 0,
+                        fresh ? highRatio : 0, fresh ? lowRatio : 0, label, probabilities[best]);
+                    // Valori normalizzati visti dal classificatore + punteggi grezzi per classe:
+                    // servono a capire QUALE termine fa perdere una classe, non solo che perde.
+                    for (int j = 0; j < features.Length; j++) row.AppendFormat(CultureInfo.InvariantCulture, ",{0:F3}", features[j]);
+                    for (int c = 0; c < Labels.Length; c++) row.AppendFormat(CultureInfo.InvariantCulture, ",{0:F3}", rawScores[c]);
+                    dump.WriteLine(row.ToString());
+                    dump.Flush(); // Once a second, never on the per-frame path.
+                }
+                catch (Exception ex) { DisableDump(ex); }
+            }
+        }
+    }
+
     class Program
     {
         const int SIO_UDP_CONNRESET = -1744830452;
 
         static int selectedTargetPid = 0; // 0 = Tutto il sistema
+        static Mutex instanceMutex;
+        static ManualResetEvent cmdReady = new ManualResetEvent(false);
+        static long leaseDeadlineMs;
 
         static void Main(string[] args)
         {
+            try
+            {
+                Run(args);
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine(ex);
+                Environment.Exit(5);
+            }
+        }
+
+        static void Run(string[] args)
+        {
+            Stopwatch lifecycleClock = Stopwatch.StartNew();
+            int leaseMs = 0;
+            string dumpPath = null;
+            foreach (string arg in args)
+            {
+                if (arg.StartsWith("--dump-features=", StringComparison.Ordinal))
+                    dumpPath = arg.Substring(16);
+                if (arg.StartsWith("--lease-ms=", StringComparison.Ordinal))
+                {
+                    int parsedLease;
+                    if (int.TryParse(arg.Substring(11), out parsedLease) && parsedLease > 0)
+                        leaseMs = parsedLease;
+                }
+            }
+            Interlocked.Exchange(ref leaseDeadlineMs, lifecycleClock.ElapsedMilliseconds + leaseMs);
             int port = 4242;
             int cmdPort = 4243;
             if (args.Length > 0)
@@ -25,6 +440,35 @@ namespace LoopbackCapture
                 cmdPort = port + 1;
             }
 
+            int parentPid = 0;
+            if (args.Length > 1) int.TryParse(args[1], out parentPid);
+            if (parentPid > 0)
+            {
+                Thread parentWatchdog = new Thread(() =>
+                {
+                    try
+                    {
+                        using (Process parent = Process.GetProcessById(parentPid))
+                        {
+                            parent.WaitForExit();
+                        }
+                    }
+                    catch { }
+                    Environment.Exit(0);
+                });
+                parentWatchdog.IsBackground = true;
+                parentWatchdog.Start();
+            }
+
+            bool createdNew;
+            instanceMutex = new Mutex(false, "Local\\LoopbackCapture_" + port, out createdNew);
+            if (!createdNew)
+            {
+                Console.Error.WriteLine("LoopbackCapture: istanza gia attiva sulla porta " + port);
+                Environment.Exit(3);
+            }
+            GC.KeepAlive(instanceMutex);
+
             UdpClient udpSend = null;
             try
             {
@@ -44,6 +488,7 @@ namespace LoopbackCapture
                 try
                 {
                     udpCmd = new UdpClient(cmdPort);
+                    cmdReady.Set();
                     IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
                     while (true)
                     {
@@ -57,6 +502,11 @@ namespace LoopbackCapture
                                 selectedTargetPid = pid;
                             }
                         }
+                        else if (cmd.StartsWith("PING:", StringComparison.Ordinal))
+                        {
+                            Interlocked.Exchange(ref leaseDeadlineMs, lifecycleClock.ElapsedMilliseconds + leaseMs);
+                        }
+                        // Unknown commands are deliberately ignored.
                     }
                 }
                 catch { }
@@ -64,29 +514,42 @@ namespace LoopbackCapture
             cmdListenerThread.IsBackground = true;
             cmdListenerThread.Start();
 
+            // Thread.Start alone does not guarantee that the command socket is bound.
+            if (!cmdReady.WaitOne(2000))
+                Console.Error.WriteLine("LoopbackCapture: command socket not ready after 2000 ms; continuing.");
+
+            // Announce after command readiness (or its bounded diagnostic timeout).
+            try
+            {
+                byte[] hello = Encoding.UTF8.GetBytes("HELLO:2");
+                udpSend.Send(hello, hello.Length, remoteEp);
+            }
+            catch { }
+
             IMMDeviceEnumerator enumerator = (IMMDeviceEnumerator)new MMDeviceEnumeratorComObject();
             IMMDevice device = null;
             int hr = enumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out device);
             if (hr != 0 || device == null)
             {
                 hr = enumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eConsole, out device);
-                if (hr != 0 || device == null) return;
+                if (hr != 0 || device == null) Environment.Exit(2);
             }
 
             Guid iidMgr = typeof(IAudioSessionManager2).GUID;
             object oMgr;
-            device.Activate(ref iidMgr, 1, IntPtr.Zero, out oMgr);
+            hr = device.Activate(ref iidMgr, 1, IntPtr.Zero, out oMgr);
+            if (hr != 0 || oMgr == null) Environment.Exit(4);
             IAudioSessionManager2 sessionManager = (IAudioSessionManager2)oMgr;
 
             Guid iidAudioClient = typeof(IAudioClient).GUID;
             object oAudioClient;
             hr = device.Activate(ref iidAudioClient, 1, IntPtr.Zero, out oAudioClient);
-            if (hr != 0 || oAudioClient == null) return;
+            if (hr != 0 || oAudioClient == null) Environment.Exit(4);
 
             IAudioClient audioClient = (IAudioClient)oAudioClient;
             IntPtr pMixFormat;
             hr = audioClient.GetMixFormat(out pMixFormat);
-            if (hr != 0 || pMixFormat == IntPtr.Zero) return;
+            if (hr != 0 || pMixFormat == IntPtr.Zero) Environment.Exit(4);
 
             WAVEFORMATEX wf = (WAVEFORMATEX)Marshal.PtrToStructure(pMixFormat, typeof(WAVEFORMATEX));
             int channels = wf.nChannels;
@@ -112,15 +575,16 @@ namespace LoopbackCapture
             Guid emptySession = Guid.Empty;
 
             hr = audioClient.Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_LOOPBACK, 10000000, 0, pMixFormat, ref emptySession);
-            if (hr != 0) return;
+            if (hr != 0) Environment.Exit(4);
 
             Guid iidCaptureClient = typeof(IAudioCaptureClient).GUID;
             object oCaptureClient;
             hr = audioClient.GetService(ref iidCaptureClient, out oCaptureClient);
-            if (hr != 0 || oCaptureClient == null) return;
+            if (hr != 0 || oCaptureClient == null) Environment.Exit(4);
 
             IAudioCaptureClient captureClient = (IAudioCaptureClient)oCaptureClient;
-            audioClient.Start();
+            hr = audioClient.Start();
+            if (hr != 0) Environment.Exit(4);
 
             // Filtro Passa-Basso sui Sub-Bassi (cassa e basse frequenze: 120 Hz)
             float cutoffFreq = 120.0f;
@@ -134,6 +598,7 @@ namespace LoopbackCapture
             // Buffer circolare onset flux temporizzato ai campioni audio reali (100 Hz = ogni 10ms esatti)
             int hopSize = sampleRate / 100;
             if (hopSize < 1) hopSize = 480;
+            RuleGenreAnalyzer genreAnalyzer = new RuleGenreAnalyzer(sampleRate, hopSize, dumpPath);
             const int BUFFER_HOPS = 400; // 4.0 secondi di finestra temporale
             float[] onsetBuffer = new float[BUFFER_HOPS];
             int onsetHead = 0;
@@ -146,15 +611,50 @@ namespace LoopbackCapture
             float prevHopTotalRms = 0;
 
             float detectedBpm = 0.0f;
+            double foldedBpm = 0.0; // tempo canonico con cui e' stato costruito lo storico ritmico
             int candidateBpm = 0;
             int candidateStreak = 0;
             int bpmEvalCounter = 0;
 
             long lastAppListBroadcast = 0;
             int myPid = Process.GetCurrentProcess().Id;
+            long lastHeartbeat = -250;
+            long heartbeatCounter = 0;
+            long captureErrorSince = -1;
 
             while (true)
             {
+                if (leaseMs > 0 && lifecycleClock.ElapsedMilliseconds > Interlocked.Read(ref leaseDeadlineMs))
+                {
+                    // Prefer clean parent termination even if its watchdog has not run yet.
+                    if (parentPid > 0)
+                    {
+                        try
+                        {
+                            using (Process parent = Process.GetProcessById(parentPid))
+                            {
+                                if (parent.HasExited) Environment.Exit(0);
+                            }
+                        }
+                        catch { Environment.Exit(0); }
+                    }
+                    // A PING may have renewed the lease while checking the parent.
+                    if (lifecycleClock.ElapsedMilliseconds > Interlocked.Read(ref leaseDeadlineMs))
+                    {
+                        Console.Error.WriteLine("LoopbackCapture: lease expired (Godot is not responding).");
+                        Environment.Exit(6);
+                    }
+                }
+                if (lifecycleClock.ElapsedMilliseconds - lastHeartbeat >= 250)
+                {
+                    lastHeartbeat = lifecycleClock.ElapsedMilliseconds;
+                    try
+                    {
+                        byte[] heartbeat = Encoding.UTF8.GetBytes(string.Format("HB:{0};0", heartbeatCounter++));
+                        udpSend.Send(heartbeat, heartbeat.Length, remoteEp);
+                    }
+                    catch { }
+                }
                 // 1. Lettura campioni PCM WASAPI dal loopback di sistema
                 uint packetLength = 0;
                 hr = captureClient.GetNextPacketSize(out packetLength);
@@ -168,6 +668,7 @@ namespace LoopbackCapture
 
                     hr = captureClient.GetBuffer(out pData, out numFramesRead, out flags, out devPos, out qpcPos);
                     if (hr != 0) break;
+                    if (numFramesRead > 0) genreAnalyzer.MarkData(lifecycleClock.ElapsedMilliseconds);
 
                     if ((flags & 1) == 0 && numFramesRead > 0)
                     {
@@ -200,6 +701,7 @@ namespace LoopbackCapture
                                     monoSample /= channels;
                                 }
 
+                                genreAnalyzer.AddSample((flags & 2) != 0 ? 0f : monoSample);
                                 totalSumSq += (monoSample * monoSample);
 
                                 // Filtro IIR passa-basso a doppio polo per estrarre la cassa
@@ -243,6 +745,7 @@ namespace LoopbackCapture
                     }
                     else
                     {
+                        for (uint f = 0; f < numFramesRead; f++) genreAnalyzer.AddSample(0f);
                         currentTotalRms *= 0.7f;
                     }
 
@@ -250,6 +753,18 @@ namespace LoopbackCapture
                     hr = captureClient.GetNextPacketSize(out packetLength);
                 }
 
+                // A full second of consecutive failed capture iterations is persistent.
+                if (hr != 0)
+                {
+                    if (captureErrorSince < 0) captureErrorSince = lifecycleClock.ElapsedMilliseconds;
+                    if (lifecycleClock.ElapsedMilliseconds - captureErrorSince >= 1000)
+                    {
+                        Console.Error.WriteLine("Persistent WASAPI capture error: " + hr);
+                        Environment.Exit(5);
+                    }
+                }
+                else captureErrorSince = -1;
+
                 // 2. Volume mirato se selezionata una specifica applicazione (es. Spotify/Chrome)
                 float displayRms = currentTotalRms;
                 if (selectedTargetPid > 0 && sessionManager != null)
@@ -427,6 +942,22 @@ namespace LoopbackCapture
                     }
                 }
 
+                // Il folding ritmico e' valido solo sullo stesso brano. Il ring contiene envelope
+                // di onset indipendenti dal tempo: il problema non e' il BPM in se', ma mediare
+                // battute di brani diversi. Serve quindi un salto DISCRETO di tempo, non la deriva
+                // dell'inseguimento morbido (0.94/0.06), che altrimenti azzererebbe lo storico
+                // a ogni gradino e dembow resterebbe sempre a zero.
+                // Il confronto usa il tempo canonico: un flip di ottava del rilevatore (170 -> 171)
+                // non deve azzerare nulla, mentre un cambio reale di brano si'.
+                double canonicalBpm = RuleGenreAnalyzer.CanonicalTempo(detectedBpm);
+                if (detectedBpm > 50.0f && Math.Abs(canonicalBpm - foldedBpm) > 10.0)
+                {
+                    genreAnalyzer.ResetRhythm();
+                }
+                foldedBpm = canonicalBpm;
+
+                genreAnalyzer.Publish(lifecycleClock.ElapsedMilliseconds, canonicalBpm, udpSend, remoteEp);
+
                 // 4. Invio lista applicazioni attive (FILTRANDO se stesso e Godot!)
                 long nowTicks = DateTime.UtcNow.Ticks;
                 if ((nowTicks - lastAppListBroadcast) >= (TimeSpan.TicksPerMillisecond * 1500) && sessionManager != null)

bin/build.ps1

@@ -0,0 +1,10 @@
+$csc = "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe"
+if (-not (Test-Path $csc)) {
+    $csc = "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"
+}
+if (-not (Test-Path $csc)) {
+    Write-Error "Compilatore .NET Framework csc.exe non trovato (Framework64 / Framework)."
+    exit 1
+}
+& $csc /nologo /unsafe /optimize+ /target:exe /out:bin\LoopbackCapture.exe bin\LoopbackCapture.cs
+exit $LASTEXITCODE