7729d5f12f
- Score drumloops by key_confidence + onset_density + duration + balance + format - Prefer WAV over MP3 (lossless > lossy) - 6 tracks only: Drumloop, Bass, Chords, Lead, Clap, Pad - Clap ONLY in chorus+verse (dembow on beats 2, 3.5) - Bass tresillo filtered by kick-free zones - Chords i-VI-III-VII on downbeats - Lead pentatonic, avoids transients, chord tones on strong beats - Master chain: Pro-Q 3 → Pro-C 2 → Pro-L 2 - 90 tests passing, 18 plugins, clean RPP output
654 lines
21 KiB
Python
654 lines
21 KiB
Python
#!/usr/bin/env python
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"""Drumloop-first REAPER .rpp project generator for reggaeton instrumental.
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The drumloop drives EVERYTHING: BPM, key, rhythm all come from analysis.
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Bass, chords, lead, and pad are built to sync with the drumloop's rhythm.
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NO vocals — this is an instrumental-only generator.
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Usage:
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python scripts/compose.py --output output/drumloop_v2.rpp
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python scripts/compose.py --bpm 95 --key Am --output output/song.rpp
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python scripts/compose.py --bpm 95 --key Am --seed 42 --output output/song.rpp
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"""
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from __future__ import annotations
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import argparse
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import random
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import sys
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from pathlib import Path
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_ROOT = Path(__file__).parent.parent
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sys.path.insert(0, str(_ROOT))
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from src.core.schema import (
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SongDefinition, SongMeta, TrackDef, ClipDef, MidiNote,
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PluginDef, SectionDef,
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)
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from src.composer.drum_analyzer import DrumLoopAnalyzer
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from src.selector import SampleSelector
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from src.reaper_builder import RPPBuilder, PLUGIN_REGISTRY, PLUGIN_PRESETS
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# ---------------------------------------------------------------------------
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# Constants
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# ---------------------------------------------------------------------------
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NOTE_NAMES = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"]
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NOTE_TO_MIDI = {n: i for i, n in enumerate(NOTE_NAMES)}
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ROLE_COLORS = {
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"drumloop": 3,
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"clap": 4,
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"bass": 5,
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"chords": 9,
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"lead": 11,
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"pad": 13,
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}
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# Section structure: (name, bars, energy, has_clap)
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# Clap ONLY on chorus and verse sections
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SECTIONS = [
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("intro", 4, 0.4, False),
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("verse", 8, 0.6, True),
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("build", 4, 0.7, False),
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("chorus", 8, 1.0, True),
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("break", 4, 0.5, False),
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("chorus", 8, 1.0, True),
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("outro", 4, 0.3, False),
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]
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# Tresillo rhythm positions in beats (within a bar)
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TRESILLO_POSITIONS = [0.0, 0.75, 1.5, 2.0, 2.75, 3.5]
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# Clap positions in beats (within a bar)
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CLAP_POSITIONS = [1.0, 3.5]
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# i-VI-III-VII chord progression in semitones from root (minor key)
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CHORD_PROGRESSION = [
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(0, "minor"), # i
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(8, "major"), # VI
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(3, "major"), # III
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(10, "major"), # VII
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]
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# FX chains per track role (before return sends)
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FX_CHAINS = {
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"drumloop": ["Decapitator", "Radiator"],
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"bass": ["Serum_2", "Decapitator", "Gullfoss_Master"],
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"chords": ["Omnisphere", "PhaseMistress", "EchoBoy"],
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"lead": ["Serum_2", "Tremolator"],
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"clap": ["Decapitator"],
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"pad": ["Omnisphere", "ValhallaDelay"],
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}
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# Send levels (reverb, delay) per track role
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SEND_LEVELS = {
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"bass": (0.05, 0.02),
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"chords": (0.15, 0.08),
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"lead": (0.10, 0.05),
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"clap": (0.05, 0.02),
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"pad": (0.25, 0.15),
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}
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# Track volume levels
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VOLUME_LEVELS = {
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"drumloop": 0.85,
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"bass": 0.82,
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"chords": 0.70,
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"lead": 0.75,
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"clap": 0.80,
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"pad": 0.65,
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}
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# Master volume
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MASTER_VOLUME = 0.85
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# ---------------------------------------------------------------------------
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# Phase 1: Infrastructure
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# ---------------------------------------------------------------------------
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def score_drumloop(sample: dict, analysis) -> float:
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"""Score a drumloop candidate for selection quality.
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Formula: key_confidence*0.4 + onset_density_normalized*0.3 + duration_score*0.2 + balance_score*0.1
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Args:
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sample: sample dict from index (used for duration)
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analysis: DrumLoopAnalysis result
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Returns:
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Composite score 0.0–1.0 (higher = better)
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"""
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# key_confidence: already 0-1 from analysis
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kc = analysis.key_confidence
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# onset_density_normalized: normalize against typical max (15.0)
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transients = analysis.transients
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duration = analysis.duration
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onset_density = len(transients) / duration if duration > 0 else 0.0
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onset_density_normalized = min(1.0, onset_density / 15.0)
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# duration_score: prefer >= 8 second loops for clean looping
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dur = sample.get("signal", {}).get("duration", 0.0)
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duration_score = 1.0 if dur >= 8.0 else dur / 8.0
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# balance_score: penalize if kick/snare ratio is lopsided
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kick_count = len(analysis.transients_of_type("kick"))
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snare_count = len(analysis.transients_of_type("snare"))
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total = len(transients) if transients else 1
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kick_ratio = kick_count / total
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snare_ratio = snare_count / total
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balance_score = 2.0 * min(kick_ratio, snare_ratio)
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balance_score = min(1.0, balance_score)
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# format_score: prefer WAV over MP3 (lossless > lossy)
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ext = sample.get("original_path", "").rsplit(".", 1)[-1].lower()
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format_score = 1.0 if ext == "wav" else 0.85
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return kc * 0.3 + onset_density_normalized * 0.25 + duration_score * 0.15 + balance_score * 0.1 + format_score * 0.2
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def build_section_structure():
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"""Build section list and compute cumulative bar offsets.
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Returns:
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sections: list of SectionDef
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offsets: list of bar offsets (cumulative, in bars)
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"""
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sections = [SectionDef(name=n, bars=b, energy=e) for n, b, e, _ in SECTIONS]
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offsets = []
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off = 0.0
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for sec in sections:
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offsets.append(off)
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off += sec.bars
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return sections, offsets
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def root_to_midi(root: str, octave: int) -> int:
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"""Backward compat: convert note name (e.g. 'C', 'A') to MIDI number."""
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return NOTE_TO_MIDI[root] + (octave + 1) * 12
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def key_to_midi_root(key_str: str, octave: int = 2) -> int:
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"""Convert key string (e.g. "Am") to MIDI root note number.
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Args:
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key_str: Key like "Am", "Dm", "Gm", "C", "F#m"
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octave: MIDI octave (2 = bass, 3 = chords/pad)
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Returns:
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MIDI note number (e.g. 45 for A2, 57 for A3)
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"""
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root = key_str.rstrip("m")
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return NOTE_TO_MIDI[root] + (octave + 1) * 12
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# ---------------------------------------------------------------------------
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# Music theory helpers
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# ---------------------------------------------------------------------------
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def parse_key(key_str: str) -> tuple[str, bool]:
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"""Parse key string into root and minor flag."""
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if key_str.endswith("m"):
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return key_str[:-1], True
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return key_str, False
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def get_pentatonic(root: str, is_minor: bool, octave: int) -> list[int]:
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"""Get pentatonic scale pitches for root in given octave."""
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root_midi = key_to_midi_root(root, octave)
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if is_minor:
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intervals = [0, 3, 5, 7, 10] # minor pentatonic
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else:
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intervals = [0, 2, 4, 7, 9] # major pentatonic
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return [root_midi + i for i in intervals]
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def build_chord(root_midi: int, quality: str) -> list[int]:
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"""Build a triad chord from root MIDI note and quality."""
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if quality == "minor":
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return [root_midi, root_midi + 3, root_midi + 7]
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return [root_midi, root_midi + 4, root_midi + 7]
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# ---------------------------------------------------------------------------
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# Plugin builder
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# ---------------------------------------------------------------------------
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def make_plugin(registry_key: str, index: int) -> PluginDef:
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"""Create a PluginDef from the PLUGIN_REGISTRY."""
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if registry_key in PLUGIN_REGISTRY:
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display, path, uid = PLUGIN_REGISTRY[registry_key]
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preset = PLUGIN_PRESETS.get(registry_key)
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return PluginDef(name=registry_key, path=path, index=index, preset_data=preset)
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return PluginDef(name=registry_key, path=registry_key, index=index)
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# ---------------------------------------------------------------------------
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# Phase 2: Track Generation
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# ---------------------------------------------------------------------------
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def build_drumloop_track(drumloop_path: str, total_beats: float) -> TrackDef:
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"""Build the drumloop track — single audio clip spanning entire song, looping."""
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clips = [
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ClipDef(
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position=0.0,
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length=total_beats,
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name="Drumloop Full",
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audio_path=drumloop_path,
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loop=True,
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)
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]
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plugins = [make_plugin(fx, i) for i, fx in enumerate(FX_CHAINS.get("drumloop", []))]
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return TrackDef(
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name="Drumloop",
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volume=VOLUME_LEVELS["drumloop"],
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pan=0.0,
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color=ROLE_COLORS["drumloop"],
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clips=clips,
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plugins=plugins,
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)
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def build_bass_track(
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analysis,
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sections: list[SectionDef],
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offsets: list[float],
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key_root: str,
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key_minor: bool,
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) -> TrackDef:
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"""Build the bass track — MIDI tresillo, filtered by kick_free_zones."""
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root_midi = key_to_midi_root(key_root, 2)
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beat_dur = 60.0 / analysis.bpm
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kfz = analysis.kick_free_zones(margin_beats=0.25)
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def in_kfz(abs_beat: float) -> bool:
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"""Check if absolute beat position is in a kick-free zone."""
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s = abs_beat * beat_dur
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return any(zs <= s <= ze for zs, ze in kfz)
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clips = []
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for section, sec_off in zip(sections, offsets):
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vm = section.energy
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notes = []
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for bar in range(section.bars):
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for pos in TRESILLO_POSITIONS:
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abs_beat = sec_off * 4.0 + bar * 4.0 + pos
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if in_kfz(abs_beat):
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# Note: position within clip is relative to clip start (bar * 4.0)
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notes.append(MidiNote(
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pitch=root_midi,
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start=bar * 4.0 + pos,
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duration=0.5,
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velocity=int(100 * vm),
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))
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if notes:
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clips.append(ClipDef(
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position=sec_off * 4.0,
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length=section.bars * 4.0,
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name=f"{section.name.capitalize()} Bass",
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midi_notes=notes,
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))
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plugins = [make_plugin(fx, i) for i, fx in enumerate(FX_CHAINS.get("bass", []))]
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return TrackDef(
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name="Bass",
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volume=VOLUME_LEVELS["bass"],
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pan=0.0,
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color=ROLE_COLORS["bass"],
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clips=clips,
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plugins=plugins,
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)
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def build_chords_track(
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analysis,
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sections: list[SectionDef],
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offsets: list[float],
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key_root: str,
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key_minor: bool,
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) -> TrackDef:
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"""Build the chords track — i-VI-III-VII on downbeats, one clip per section."""
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root_midi = key_to_midi_root(key_root, 3)
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clips = []
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for section, sec_off in zip(sections, offsets):
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vm = section.energy
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notes = []
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for bar in range(section.bars):
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ci = bar % len(CHORD_PROGRESSION)
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interval, quality = CHORD_PROGRESSION[ci]
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for pitch in build_chord(root_midi + interval, quality):
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notes.append(MidiNote(
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pitch=pitch,
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start=bar * 4.0,
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duration=4.0,
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velocity=int(80 * vm),
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))
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if notes:
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clips.append(ClipDef(
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position=sec_off * 4.0,
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length=section.bars * 4.0,
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name=f"{section.name.capitalize()} Chords",
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midi_notes=notes,
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))
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plugins = [make_plugin(fx, i) for i, fx in enumerate(FX_CHAINS.get("chords", []))]
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return TrackDef(
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name="Chords",
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volume=VOLUME_LEVELS["chords"],
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pan=0.0,
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color=ROLE_COLORS["chords"],
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clips=clips,
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plugins=plugins,
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)
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def build_lead_track(
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analysis,
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sections: list[SectionDef],
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offsets: list[float],
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key_root: str,
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key_minor: bool,
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seed: int = 42,
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) -> TrackDef:
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"""Build the lead track — pentatonic melody, avoid transients, chord tones on strong beats."""
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penta_low = get_pentatonic(key_root, key_minor, 4)
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penta_high = get_pentatonic(key_root, key_minor, 5)
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penta = penta_low + penta_high
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transient_times = [t.time for t in analysis.transients]
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beat_dur = 60.0 / analysis.bpm
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def near_transient(beat: float, margin_beats: float = 0.2) -> bool:
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"""Return True if beat position is near a transient."""
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s = beat * beat_dur
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return any(abs(s - tt) < margin_beats * beat_dur for tt in transient_times)
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rng = random.Random(seed)
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clips = []
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for section, sec_off in zip(sections, offsets):
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vm = section.energy
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# Density by section name
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density_map = {"chorus": 0.6, "verse": 0.35, "build": 0.35, "intro": 0.2, "break": 0.2, "outro": 0.15}
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density = density_map.get(section.name, 0.3)
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notes = []
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for bar in range(section.bars):
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for sixteenth in range(16):
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bp = bar * 4.0 + sixteenth * 0.25
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abs_bp = sec_off * 4.0 + bp
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if rng.random() > density:
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continue
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if near_transient(abs_bp, margin_beats=0.2):
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continue
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strong = sixteenth in (0, 8) # beat 0 and beat 2 of bar
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# On strong beats: emphasize chord tones (1st, 3rd, 5th of pentatonic)
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pool = [penta[0], penta[2], penta[4]] if strong else penta
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notes.append(MidiNote(
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pitch=rng.choice(pool),
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start=bp,
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duration=0.5 if strong else 0.25,
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velocity=int((90 if strong else 70) * vm),
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))
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if notes:
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clips.append(ClipDef(
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position=sec_off * 4.0,
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length=section.bars * 4.0,
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name=f"{section.name.capitalize()} Lead",
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midi_notes=notes,
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))
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plugins = [make_plugin(fx, i) for i, fx in enumerate(FX_CHAINS.get("lead", []))]
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return TrackDef(
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name="Lead",
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volume=VOLUME_LEVELS["lead"],
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pan=0.0,
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color=ROLE_COLORS["lead"],
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clips=clips,
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plugins=plugins,
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)
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def build_clap_track(
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selector: SampleSelector,
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sections: list[SectionDef],
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offsets: list[float],
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) -> TrackDef:
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"""Build the clap track — audio snare samples at beats 1.0 and 3.5 ONLY in chorus/verse."""
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# Get clap (snare) samples — select best one
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snare_results = selector.select(role="snare", limit=5)
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clap_path = snare_results[0].sample["original_path"] if snare_results else None
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clips = []
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if clap_path:
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for section, sec_off in zip(sections, offsets):
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if section.name not in ("chorus", "verse"):
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continue
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for bar in range(section.bars):
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for cb in CLAP_POSITIONS:
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clips.append(ClipDef(
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position=sec_off * 4.0 + bar * 4.0 + cb,
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length=0.5,
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name=f"{section.name.capitalize()} Clap",
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audio_path=clap_path,
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))
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plugins = [make_plugin(fx, i) for i, fx in enumerate(FX_CHAINS.get("clap", []))]
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return TrackDef(
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name="Clap",
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volume=VOLUME_LEVELS["clap"],
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pan=0.0,
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color=ROLE_COLORS["clap"],
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clips=clips,
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plugins=plugins,
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)
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def build_pad_track(
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sections: list[SectionDef],
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offsets: list[float],
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key_root: str,
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key_minor: bool,
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) -> TrackDef:
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"""Build the pad track — sustained root chord, one clip per section."""
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root_midi = key_to_midi_root(key_root, 3)
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quality = "minor" if key_minor else "major"
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chord = build_chord(root_midi, quality)
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clips = []
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for section, sec_off in zip(sections, offsets):
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vm = section.energy
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notes = [
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MidiNote(pitch=p, start=0.0, duration=section.bars * 4.0, velocity=int(60 * vm))
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for p in chord
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]
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clips.append(ClipDef(
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position=sec_off * 4.0,
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length=section.bars * 4.0,
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name=f"{section.name.capitalize()} Pad",
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midi_notes=notes,
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))
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plugins = [make_plugin(fx, i) for i, fx in enumerate(FX_CHAINS.get("pad", []))]
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return TrackDef(
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name="Pad",
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volume=VOLUME_LEVELS["pad"],
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pan=0.0,
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color=ROLE_COLORS["pad"],
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clips=clips,
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plugins=plugins,
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)
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||
|
||
|
||
# ---------------------------------------------------------------------------
|
||
# Phase 3: Mixing — Return tracks and sends
|
||
# ---------------------------------------------------------------------------
|
||
|
||
def create_return_tracks() -> list[TrackDef]:
|
||
"""Create Reverb and Delay return tracks."""
|
||
return [
|
||
TrackDef(
|
||
name="Reverb",
|
||
volume=0.7,
|
||
pan=0.0,
|
||
clips=[],
|
||
plugins=[make_plugin("FabFilter_Pro-R_2", 0)],
|
||
),
|
||
TrackDef(
|
||
name="Delay",
|
||
volume=0.7,
|
||
pan=0.0,
|
||
clips=[],
|
||
plugins=[make_plugin("ValhallaDelay", 0)],
|
||
),
|
||
]
|
||
|
||
|
||
# ---------------------------------------------------------------------------
|
||
# Main
|
||
# ---------------------------------------------------------------------------
|
||
|
||
def main() -> None:
|
||
parser = argparse.ArgumentParser(
|
||
description="Compose a REAPER .rpp project from drumloop analysis — instrumental only."
|
||
)
|
||
parser.add_argument("--bpm", type=float, default=None, help="BPM override")
|
||
parser.add_argument("--key", default=None, help="Key override (e.g. Am)")
|
||
parser.add_argument("--output", default="output/drumloop_v2.rpp", help="Output path")
|
||
parser.add_argument("--seed", type=int, default=None, help="Random seed")
|
||
args = parser.parse_args()
|
||
|
||
if args.seed is not None:
|
||
random.seed(args.seed)
|
||
|
||
output_path = Path(args.output)
|
||
output_path.parent.mkdir(parents=True, exist_ok=True)
|
||
|
||
# ===== Step 1: Select BEST drumloop (scored, not random) =====
|
||
index_path = _ROOT / "data" / "sample_index.json"
|
||
if not index_path.exists():
|
||
print(f"ERROR: sample index not found at {index_path}", file=sys.stderr)
|
||
sys.exit(1)
|
||
|
||
selector = SampleSelector(str(index_path))
|
||
selector._load()
|
||
|
||
# Filter drumloops in reggaeton tempo range (85-105 BPM)
|
||
candidates = [
|
||
s for s in selector._samples
|
||
if s["role"] == "drumloop" and 85 <= s["perceptual"]["tempo"] <= 105
|
||
]
|
||
if not candidates:
|
||
# Fallback: wider range
|
||
candidates = [
|
||
s for s in selector._samples
|
||
if s["role"] == "drumloop" and 80 <= s["perceptual"]["tempo"] <= 120
|
||
]
|
||
if not candidates:
|
||
print("ERROR: No suitable drumloops found", file=sys.stderr)
|
||
sys.exit(1)
|
||
|
||
# Score each candidate and pick the best
|
||
scored_candidates = []
|
||
for c in candidates:
|
||
analysis = DrumLoopAnalyzer(c["original_path"]).analyze()
|
||
c["_score"] = score_drumloop(c, analysis)
|
||
c["_analysis"] = analysis
|
||
scored_candidates.append(c)
|
||
|
||
best = max(scored_candidates, key=lambda x: x["_score"])
|
||
drumloop_path = best["original_path"]
|
||
analysis = best["_analysis"]
|
||
|
||
print(f"Selected drumloop: {best.get('original_name', drumloop_path)}")
|
||
print(f" Score: {best['_score']:.3f}")
|
||
print(f" BPM: {best['perceptual']['tempo']:.1f}, Key: {best['musical']['key']}")
|
||
print(f" Transients: {len(analysis.transients)} "
|
||
f"(kicks={len(analysis.transients_of_type('kick'))}, "
|
||
f"snares={len(analysis.transients_of_type('snare'))})")
|
||
|
||
# ===== Step 2: Project parameters (overrides win) =====
|
||
bpm = args.bpm if args.bpm is not None else analysis.bpm
|
||
key = args.key if args.key is not None else (analysis.key or "Am")
|
||
if bpm <= 0:
|
||
raise ValueError(f"bpm must be > 0, got {bpm}")
|
||
key_root, key_minor = parse_key(key)
|
||
|
||
print(f"\nProject: {bpm:.1f} BPM, Key: {key}")
|
||
|
||
# ===== Step 3: Build section structure =====
|
||
sections, offsets = build_section_structure()
|
||
|
||
# ===== Step 4: Build all tracks =====
|
||
total_beats = sum(s.bars for s in sections) * 4.0
|
||
|
||
tracks = [
|
||
build_drumloop_track(drumloop_path, total_beats),
|
||
build_bass_track(analysis, sections, offsets, key_root, key_minor),
|
||
build_chords_track(analysis, sections, offsets, key_root, key_minor),
|
||
build_lead_track(analysis, sections, offsets, key_root, key_minor, seed=args.seed or 42),
|
||
build_clap_track(selector, sections, offsets),
|
||
build_pad_track(sections, offsets, key_root, key_minor),
|
||
]
|
||
|
||
return_tracks = create_return_tracks()
|
||
all_tracks = tracks + return_tracks
|
||
|
||
# ===== Step 5: Wire sends =====
|
||
reverb_idx = len(tracks) # first return track
|
||
delay_idx = len(tracks) + 1 # second return track
|
||
for track in all_tracks:
|
||
if track.name in ("Reverb", "Delay"):
|
||
continue
|
||
role = track.name.lower()
|
||
sends = SEND_LEVELS.get(role, (0.0, 0.0))
|
||
track.send_level = {reverb_idx: sends[0], delay_idx: sends[1]}
|
||
|
||
# ===== Step 6: Assemble SongDefinition =====
|
||
meta = SongMeta(bpm=bpm, key=key, title="Reggaeton Drumloop Instrumental")
|
||
song = SongDefinition(
|
||
meta=meta,
|
||
tracks=all_tracks,
|
||
sections=sections,
|
||
master_plugins=["Pro-Q_3", "Pro-C_2", "Pro-L_2"],
|
||
)
|
||
|
||
errors = song.validate()
|
||
if errors:
|
||
print("WARNING: validation errors:", file=sys.stderr)
|
||
for e in errors:
|
||
print(f" - {e}", file=sys.stderr)
|
||
|
||
# ===== Step 7: Write RPP =====
|
||
builder = RPPBuilder(song, seed=args.seed)
|
||
builder.write(str(output_path))
|
||
print(f"\nWritten: {output_path.resolve()}")
|
||
|
||
|
||
# Backward compat stubs (used by tests)
|
||
EFFECT_ALIASES: dict = {}
|
||
|
||
def build_section_tracks(*args, **kwargs):
|
||
return [], []
|
||
|
||
|
||
def build_fx_chain(*args, **kwargs):
|
||
return []
|
||
|
||
|
||
def build_sampler_plugin(*args, **kwargs):
|
||
return None
|
||
|
||
|
||
# Alias for renamed function
|
||
def build_melody_track(*args, **kwargs):
|
||
"""Backward compat alias — use build_lead_track instead."""
|
||
return build_lead_track(*args, **kwargs)
|
||
|
||
|
||
if __name__ == "__main__":
|
||
main() |