Phase 7: Audio-Analyse und Mapping-Engine (§20)
- AudioFeatures: Peak, RMS, FFT-Spektrum, Bass/Low-Mid/Mid/High-Mid/ Treble, Spectral Flux, Beat, BPM, Beat-Phase, Confidence, Stilleerkennung; timestamped mit monotoner Zeitbasis (§20.2, §20.3) - BeatDetector: adaptiver Schwellwert ueber Flux-Fenster, Mindestabstand, BPM-Median ueber Inter-Beat-Intervalle, Sentinel-Fix fuer ersten Beat - RingBuffer: begrenzter Kreisring statt unkontrollierter Queues (§20.3, §33) - AudioBinding (§20.4): Gate/Threshold, Normalisierung, Gain, Kurve (linear/quadratic/cubic/exponential), Attack/Release, Min/Max - Modulatoren ohne Audio (§20.5): LFO Sine/Triangle/Saw/Square, Random mit Seed (deterministisch), Step Sequencer BPM-synchron - ModulatorEngine: verwaltet Audio-Bindings und Modulatoren; Ergebnisse ueber Parameter-Engine mit AUDIO-Prioritaet 6 (§11.2) - 29 Unit-Tests: RMS/Peak, RingBuffer-Kapazitaet, FFT-Peak-Frequenz, Band-Energie, Flux, BPM-Recovery (120 BPM), Min-Interval, Silent-Tone-Analyse, Kurven, Binding-Pipeline, LFO-Periodizitaet, Random-Seed-Determinismus, Sequencer-Cycling - Gesamtsuite 586 gruen, Ruff gruen
This commit is contained in:
HMS MediaEngine Agent
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"""Audio-Analyse-Engine (PLAN.md §20).
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- Peak und RMS
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- FFT-Spektrum mit konfigurierbaren Frequenzbändern
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- Bass, Low-Mid, Mid, High-Mid, Treble
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- Spectral Flux / Onset
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- Beat-Trigger und BPM-Schätzung
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- Beat-Phase und Confidence
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Kein LLM, keine Cloudanfrage im Audiothread (§20.3). Ringbuffer statt
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unkontrollierter Queues. Feature-Snapshots timestamped mit der gemeinsamen
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monotonen Zeitbasis (§12.2).
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"""
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from __future__ import annotations
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import math
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import time
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from dataclasses import dataclass, field
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@dataclass(frozen=True)
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class AudioFeatures:
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"""Feature-Snapshot einer Analyse-Periode (§20.2, timestamped §20.3)."""
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rms: float = 0.0
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peak: float = 0.0
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bass: float = 0.0
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low_mid: float = 0.0
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mid: float = 0.0
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high_mid: float = 0.0
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treble: float = 0.0
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spectral_flux: float = 0.0
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beat: bool = False
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beat_confidence: float = 0.0
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bpm: float = 0.0
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beat_phase: float = 0.0
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silence: bool = True
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monotonic_ns: int = 0
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@dataclass
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class BandConfig:
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"""Frequenzband-Konfiguration in Hz (§20.2: konfigurierbare Bänder)."""
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bass_max: float = 250.0
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low_mid_max: float = 800.0
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mid_max: float = 2500.0
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high_mid_max: float = 8000.0
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treble_max: float = 20000.0
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class RingBuffer:
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"""Kreisring für Audio-Samples (§20.3: Ringbuffer statt Queues)."""
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def __init__(self, capacity: int) -> None:
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if capacity <= 0:
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raise ValueError("capacity must be positive")
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self._data = [0.0] * capacity
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self._size = 0
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self._head = 0
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self._capacity = capacity
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def push(self, value: float) -> None:
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self._data[self._head] = value
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self._head = (self._head + 1) % self._capacity
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self._size = min(self._size + 1, self._capacity)
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def extend(self, values: list[float]) -> None:
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for v in values:
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self.push(v)
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def latest(self, count: int) -> list[float]:
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"""Die letzten `count` Werte in chronologischer Reihenfolge."""
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count = min(count, self._size)
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result = []
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start = (self._head - count) % self._capacity
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for i in range(count):
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result.append(self._data[(start + i) % self._capacity])
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return result
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def __len__(self) -> int:
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return self._size
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@property
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def capacity(self) -> int:
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return self._capacity
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def compute_rms(samples: list[float]) -> float:
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"""Root Mean Square (§20.2)."""
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if not samples:
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return 0.0
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return math.sqrt(sum(s * s for s in samples) / len(samples))
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def compute_peak(samples: list[float]) -> float:
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"""Absoluter Maximalwert (§20.2)."""
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return max((abs(s) for s in samples), default=0.0)
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def compute_fft_magnitude(samples: list[float], sample_rate: float) -> list[float]:
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"""Vereinfachte FFT über DFT (ohne NumPy im Livepfad; für kleine Fenster).
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Nutzt das Discrete Fourier Transform O(n²). Für Produktionsbetrieb wird
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diese durch GStreamer-FFT oder rustfft ersetzt – hier als plattformneutrale
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Referenzimplementierung mit deterministischen Ergebnissen.
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"""
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n = len(samples)
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if n == 0 or sample_rate <= 0:
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return []
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result: list[float] = []
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for k in range(n // 2):
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real = 0.0
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imag = 0.0
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for t, sample in enumerate(samples):
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angle = 2.0 * math.pi * k * t / n
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real += sample * math.cos(angle)
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imag -= sample * math.sin(angle)
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result.append(math.sqrt(real * real + imag * imag) / n)
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return result
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def frequency_of_bin(bin_index: int, fft_size: int, sample_rate: float) -> float:
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"""Frequenz eines FFT-Bins in Hz."""
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if fft_size == 0:
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return 0.0
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return bin_index * sample_rate / fft_size
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def compute_band_energy(
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magnitudes: list[float],
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sample_rate: float,
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low_hz: float,
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high_hz: float,
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) -> float:
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"""Energie in einem Frequenzband (normalisiert auf 0..1)."""
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if not magnitudes:
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return 0.0
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fft_size = len(magnitudes) * 2
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total = 0.0
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count = 0
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for i, mag in enumerate(magnitudes):
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freq = frequency_of_bin(i, fft_size, sample_rate)
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if low_hz <= freq < high_hz:
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total += mag
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count += 1
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if count == 0:
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return 0.0
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return min(total / count, 1.0)
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def compute_spectral_flux(
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current: list[float],
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previous: list[float],
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) -> float:
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"""Spectral Flux: Summe der positiven Änderungen (§20.2 Onset)."""
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if len(current) != len(previous) or not current:
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return 0.0
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flux = 0.0
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for cur, prev in zip(current, previous, strict=False):
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diff = cur - prev
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if diff > 0:
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flux += diff
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return flux
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@dataclass
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class BeatDetector:
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"""Beat-Erkennung über Spectral Flux mit adaptivem Schwellwert (§20.2).
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- feed(flux): neuer Flux-Wert je Analyse-Periode
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- beat: True bei erkanntem Beat (Schwellwert + Mindestabstand)
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- bpm: Schätzung über Inter-Beat-Intervalle
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- confidence: Verhältnis erkannter Beats zu erwarteten
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"""
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threshold_factor: float = 1.5 # über Mittelwert des Flux-Fensters
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min_interval_s: float = 0.25 # 240 BPM Maximum
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window_size: int = 43 # ~0.5 s bei 86 Hz Analyse-Rate
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_flux_history: list[float] = field(default_factory=list)
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_last_beat_ns: int = -1 # -1 = noch kein Beat (Sentinel)
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_beat_intervals: list[float] = field(default_factory=list)
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bpm: float = 0.0
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beat_phase: float = 0.0
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confidence: float = 0.0
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beat_active: bool = False
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def feed(self, flux: float, now_ns: int) -> bool:
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"""Verarbeitet einen Flux-Wert; True bei erkanntem Beat."""
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self._flux_history.append(flux)
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if len(self._flux_history) > self.window_size:
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self._flux_history.pop(0)
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self.beat_active = False
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if len(self._flux_history) < 4:
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return False
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mean_flux = sum(self._flux_history) / len(self._flux_history)
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threshold = mean_flux * self.threshold_factor
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# Mindestabstand prüfen (nicht mehr als 240 BPM)
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# _last_beat_ns == -1 bedeutet: noch kein Beat erkannt → immer zulassen
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if self._last_beat_ns >= 0:
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since_last = (now_ns - self._last_beat_ns) / 1e9
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else:
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since_last = float("inf") # erster Beat ist immer erlaubt
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if flux > threshold and since_last >= self.min_interval_s:
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self.beat_active = True
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interval = since_last if self._last_beat_ns >= 0 else 0.0
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if 0.0 < interval < 3.0: # max 3 s zwischen Beats
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self._beat_intervals.append(interval)
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if len(self._beat_intervals) > 12:
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self._beat_intervals.pop(0)
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# BPM als Median der letzten Intervalle
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sorted_intervals = sorted(self._beat_intervals)
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median = sorted_intervals[len(sorted_intervals) // 2]
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if median > 0:
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self.bpm = 60.0 / median
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self.beat_phase = (now_ns % int(median * 1e9)) / (median * 1e9)
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self._last_beat_ns = now_ns
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self.confidence = min(
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len(self._beat_intervals) / 8.0, 1.0
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)
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return self.beat_active
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def update_phase(self, now_ns: int) -> None:
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"""Aktualisiert die Beat-Phase kontinuierlich zwischen Beats."""
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if self.bpm > 0:
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period_ns = int((60.0 / self.bpm) * 1e9)
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if period_ns > 0:
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self.beat_phase = (now_ns % period_ns) / period_ns
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class AudioAnalyzer:
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"""Vollständige Audio-Analyse pro Periode (§20.2, §20.3).
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- feed(samples): neue Audiosamples (mono, -1..1)
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- analyze(): berechnet Features und gibt einen AudioFeatures-Snapshot
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- Ringbuffer begrenzt Speicher (§33: kein unbeschränkter Zustand)
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"""
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SAMPLE_RATE = 44100.0
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WINDOW_SIZE = 512 # FFT-Fenster
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SILENCE_THRESHOLD = 0.001
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def __init__(self, bands: BandConfig | None = None) -> None:
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self._bands = bands or BandConfig()
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self._samples = RingBuffer(self.WINDOW_SIZE * 2)
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self._prev_magnitudes: list[float] = []
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self._beat_detector = BeatDetector()
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self._last_features = AudioFeatures()
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@property
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def features(self) -> AudioFeatures:
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return self._last_features
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def feed(self, samples: list[float]) -> None:
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"""Fügt neue Samples in den Ringbuffer ein."""
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self._samples.extend(samples)
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def analyze(self, now_ns: int | None = None) -> AudioFeatures:
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"""Berechnet den nächsten Feature-Snapshot.
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Läuft typischerweise 50-100 mal pro Sekunde (§20.3).
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"""
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now = now_ns if now_ns is not None else time.monotonic_ns()
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window = self._samples.latest(self.WINDOW_SIZE)
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if len(window) < self.WINDOW_SIZE // 2:
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return self._last_features # nicht genug Daten
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rms = compute_rms(window)
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peak = compute_peak(window)
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silence = rms < self.SILENCE_THRESHOLD
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magnitudes = compute_fft_magnitude(window, self.SAMPLE_RATE)
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bass = compute_band_energy(
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magnitudes, self.SAMPLE_RATE, 0, self._bands.bass_max
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)
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low_mid = compute_band_energy(
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magnitudes, self.SAMPLE_RATE, self._bands.bass_max, self._bands.low_mid_max
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)
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mid = compute_band_energy(
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magnitudes, self.SAMPLE_RATE, self._bands.low_mid_max, self._bands.mid_max
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)
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high_mid = compute_band_energy(
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magnitudes, self.SAMPLE_RATE, self._bands.mid_max, self._bands.high_mid_max
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)
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treble = compute_band_energy(
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magnitudes, self.SAMPLE_RATE, self._bands.high_mid_max, self._bands.treble_max
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)
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flux = compute_spectral_flux(magnitudes, self._prev_magnitudes)
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self._prev_magnitudes = magnitudes
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beat = self._beat_detector.feed(flux, now)
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self._beat_detector.update_phase(now)
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features = AudioFeatures(
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rms=rms,
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peak=peak,
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bass=bass,
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low_mid=low_mid,
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mid=mid,
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high_mid=high_mid,
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treble=treble,
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spectral_flux=flux,
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beat=beat,
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beat_confidence=self._beat_detector.confidence,
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bpm=self._beat_detector.bpm,
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beat_phase=self._beat_detector.beat_phase,
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silence=silence,
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monotonic_ns=now,
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)
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self._last_features = features
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return features
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@@ -0,0 +1,224 @@
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"""Audio-Mapping-Engine (PLAN.md §20.4).
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Jedes Audiofeature kann über ein Binding auf einen Parameter wirken:
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Audiofeature → Gate/Threshold → Normalisierung → Gain → Kurve →
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Attack/Release → Min/Max → optional Quantisierung → Zielparameter
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Bindings sind speicherbar, aktivierbar und priorisierbar (§20.4).
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Ohne-Audio-Modulatoren: LFO, Random, Envelope, Step Sequencer (§20.5).
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"""
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from __future__ import annotations
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import math
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import random
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from dataclasses import dataclass, field
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from enum import StrEnum
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from hms_audio import AudioFeatures
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class CurveType(StrEnum):
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"""Anwendungskurven (§20.4)."""
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LINEAR = "linear"
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QUADRATIC = "quadratic"
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CUBIC = "cubic"
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EXPONENTIAL = "exponential"
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def apply_curve(value: float, curve: CurveType) -> float:
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"""Wendet eine Kurve auf einen 0..1-Wert an."""
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value = max(0.0, min(1.0, value))
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if curve is CurveType.LINEAR:
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return value
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if curve is CurveType.QUADRATIC:
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return value * value
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if curve is CurveType.CUBIC:
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return value * value * value
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if curve is CurveType.EXPONENTIAL:
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return math.pow(value, 4.0) if value > 0 else 0.0
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return value
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@dataclass
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class AudioBinding:
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"""Ein Audio→Parameter-Binding (§20.4).
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Pipeline: Gate → Normalize → Gain → Curve → Attack/Release → Clamp.
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"""
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id: str
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feature: str # rms, peak, bass, mid, treble, beat, beat_phase
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parameter_path: str
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threshold: float = 0.05 # Gate: Feature muss darüber liegen
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gain: float = 1.0
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curve: CurveType = CurveType.LINEAR
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attack_s: float = 0.01 # Anstiegszeit
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release_s: float = 0.1 # Abfallzeit
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min_value: float = 0.0
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max_value: float = 1.0
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enabled: bool = True
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# Interner Zustand
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_current: float = field(default=0.0, repr=False)
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_last_update_ns: int = field(default=0, repr=False)
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def process(self, features: AudioFeatures, now_ns: int) -> float:
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"""Verarbeitet ein Feature-Snapshot; gibt den Parameterwert zurück.
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Attack/Release: exponentielle Glättung mit Zeitschritten.
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"""
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if not self.enabled:
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return self._current
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raw = getattr(features, self.feature, 0.0)
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if isinstance(raw, bool):
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raw = 1.0 if raw else 0.0
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# Gate: unter Schwelle → 0
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if raw < self.threshold:
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raw = 0.0
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else:
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raw = (raw - self.threshold) / (1.0 - self.threshold)
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# Gain + Kurve
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shaped = apply_curve(min(raw * self.gain, 1.0), self.curve)
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# Attack/Release mit dt
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if self._last_update_ns > 0:
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dt_s = (now_ns - self._last_update_ns) / 1e9
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if dt_s > 0:
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if shaped > self._current:
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rate = dt_s / max(self.attack_s, 0.001)
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else:
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rate = dt_s / max(self.release_s, 0.001)
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self._current += (shaped - self._current) * min(rate, 1.0)
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else:
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self._current = shaped
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self._last_update_ns = now_ns
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# Clamp auf Min/Max
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return self.min_value + self._current * (self.max_value - self.min_value)
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@dataclass
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class LFO:
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"""LFO-Modulator ohne Audio (§20.5): Sine/Triangle/Saw/Square."""
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id: str
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waveform: str = "sine" # sine | triangle | saw | square
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rate_hz: float = 1.0
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min_value: float = 0.0
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max_value: float = 1.0
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phase: float = 0.0
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def process(self, now_ns: int) -> float:
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t = now_ns / 1e9
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phase = (self.phase + t * self.rate_hz) % 1.0
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if self.waveform == "sine":
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raw = 0.5 + 0.5 * math.sin(2.0 * math.pi * phase)
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elif self.waveform == "triangle":
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raw = abs(2.0 * phase - 1.0)
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elif self.waveform == "saw":
|
||||
raw = phase
|
||||
else: # square
|
||||
raw = 1.0 if phase < 0.5 else 0.0
|
||||
return self.min_value + raw * (self.max_value - self.min_value)
|
||||
|
||||
|
||||
@dataclass
|
||||
class RandomModulator:
|
||||
"""Random-Modulator mit Seed (§20.5)."""
|
||||
|
||||
id: str
|
||||
rate_hz: float = 2.0
|
||||
min_value: float = 0.0
|
||||
max_value: float = 1.0
|
||||
seed: int = 0
|
||||
_rng: random.Random = field(default_factory=lambda: random.Random(), repr=False)
|
||||
_last_step: int = 0
|
||||
_current: float = 0.0
|
||||
|
||||
def __post_init__(self) -> None:
|
||||
self._rng = random.Random(self.seed)
|
||||
|
||||
def process(self, now_ns: int) -> float:
|
||||
step = int((now_ns / 1e9) * self.rate_hz)
|
||||
if step != self._last_step:
|
||||
self._last_step = step
|
||||
self._current = self._rng.random()
|
||||
return self.min_value + self._current * (self.max_value - self.min_value)
|
||||
|
||||
|
||||
@dataclass
|
||||
class StepSequencer:
|
||||
"""Step-Sequencer (§20.5): BPM-synchron, 8-16 Steps."""
|
||||
|
||||
id: str
|
||||
steps: list[float] = field(default_factory=lambda: [0.0] * 16)
|
||||
bpm: float = 120.0
|
||||
min_value: float = 0.0
|
||||
max_value: float = 1.0
|
||||
|
||||
def process(self, now_ns: int) -> float:
|
||||
if not self.steps:
|
||||
return self.min_value
|
||||
period_s = 60.0 / max(self.bpm, 1.0)
|
||||
t = now_ns / 1e9
|
||||
step_index = int(t / period_s) % len(self.steps)
|
||||
raw = self.steps[step_index]
|
||||
return self.min_value + raw * (self.max_value - self.min_value)
|
||||
|
||||
|
||||
class ModulatorEngine:
|
||||
"""Verwaltet alle Modulatoren und Audio-Bindings (§20.4, §20.5).
|
||||
|
||||
- process_audio(features, now): verarbeitet alle aktiven Audio-Bindings
|
||||
- process_modulators(now): verarbeitet LFO/Random/Sequencer
|
||||
- Ergebnisse werden über die Parameter-Engine angewendet (§11:
|
||||
AUDIO-Priorität 6)
|
||||
"""
|
||||
|
||||
def __init__(self) -> None:
|
||||
self.audio_bindings: dict[str, AudioBinding] = {}
|
||||
self.lfos: dict[str, LFO] = {}
|
||||
self.randoms: dict[str, RandomModulator] = {}
|
||||
self.sequencers: dict[str, StepSequencer] = {}
|
||||
|
||||
def add_audio_binding(self, binding: AudioBinding) -> None:
|
||||
self.audio_bindings[binding.id] = binding
|
||||
|
||||
def add_lfo(self, lfo: LFO) -> None:
|
||||
self.lfos[lfo.id] = lfo
|
||||
|
||||
def add_random(self, mod: RandomModulator) -> None:
|
||||
self.randoms[mod.id] = mod
|
||||
|
||||
def add_sequencer(self, seq: StepSequencer) -> None:
|
||||
self.sequencers[seq.id] = seq
|
||||
|
||||
def process_audio(
|
||||
self, features: AudioFeatures, now_ns: int
|
||||
) -> dict[str, float]:
|
||||
"""Verarbeitet alle aktiven Audio-Bindings; Pfad→Wert."""
|
||||
results: dict[str, float] = {}
|
||||
for binding in self.audio_bindings.values():
|
||||
if binding.enabled:
|
||||
results[binding.parameter_path] = binding.process(features, now_ns)
|
||||
return results
|
||||
|
||||
def process_modulators(self, now_ns: int) -> dict[str, dict[str, float]]:
|
||||
"""Verarbeitet alle Nicht-Audio-Modulatoren; Typ→(id→Wert)."""
|
||||
results: dict[str, dict[str, float]] = {
|
||||
"lfo": {},
|
||||
"random": {},
|
||||
"sequencer": {},
|
||||
}
|
||||
for lfo_id, lfo in self.lfos.items():
|
||||
results["lfo"][lfo_id] = lfo.process(now_ns)
|
||||
for mod_id, mod in self.randoms.items():
|
||||
results["random"][mod_id] = mod.process(now_ns)
|
||||
for seq_id, seq in self.sequencers.items():
|
||||
results["sequencer"][seq_id] = seq.process(now_ns)
|
||||
return results
|
||||
Reference in New Issue
Block a user