6a703c314d
Incomplete: step 1 (fixture markers + track_truth.json), step 6 (frontend wiring), step 8 (tests) not done; suite not yet run. Salvaged from interrupted prior session. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
85 lines
4.0 KiB
Python
85 lines
4.0 KiB
Python
"""Paths, constants, and the timebase convention.
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Timebase convention (FROZEN CONTRACT — do not change without a change request):
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``t_global`` is the master timeline in seconds.
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For a video *v* with ``offset_ms`` and ``drift_ppm``::
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t_video = (t_global - offset_ms / 1000) * (1 + drift_ppm * 1e-6)
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The reference video has ``offset_ms == 0`` (and ``drift_ppm == 0``). A positive
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``offset_ms`` means the video started recording *later* than the master zero, so at a
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given ``t_global`` its local playhead is earlier. Use :func:`t_video_from_global` and
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:func:`t_global_from_video` everywhere — never re-derive the algebra inline. The
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frontend mirrors :func:`t_video_from_global` in ``transport.js``.
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"""
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from __future__ import annotations
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import os
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from pathlib import Path
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# ---------------------------------------------------------------------------
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# Paths. The data root can be overridden with FESTIVAL4D_DATA_DIR (used by tests
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# to run against a temporary project without touching the repo's data/).
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# ---------------------------------------------------------------------------
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REPO_ROOT = Path(__file__).resolve().parents[2]
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def _data_dir() -> Path:
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env = os.environ.get("FESTIVAL4D_DATA_DIR")
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return Path(env).resolve() if env else REPO_ROOT / "data"
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DATA_DIR = _data_dir()
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RAW_DIR = DATA_DIR / "raw" # user drops source videos here (gitignored)
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WORK_DIR = DATA_DIR / "work" # extracted wavs, frames, colmap workspace (gitignored)
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AUDIO_DIR = WORK_DIR / "audio" # per-video mono 16 kHz wavs (ingest)
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AUDIO_HQ_DIR = WORK_DIR / "audio_hq" # per-video listening-quality AAC (lazy, /api/audio/{id})
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FRAMES_DIR = WORK_DIR / "frames" # sampled JPEGs for SfM
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COLMAP_DIR = WORK_DIR / "colmap" # COLMAP workspace
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DB_PATH = DATA_DIR / "project.db" # SQLite (gitignored)
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BEATS_JSON = WORK_DIR / "beats.json" # beat/onset analysis (lane E / M10, /api/beats)
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CAPSULE_DIR = DATA_DIR / "capsule" # default output of `python -m festival4d capsule` (M17)
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POINTS_PLY = WORK_DIR / "points.ply" # reconstructed / synthetic point cloud
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SPLAT_PLY = WORK_DIR / "splat.ply" # optional 3DGS splat (trained externally, e.g. via MODELBEAST — see docs/modelbeast-crossover.md); viewer prefers it over the point cloud
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SYNC_JSON = WORK_DIR / "sync.json" # exported sync solution (lane A)
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GROUND_TRUTH_JSON = WORK_DIR / "ground_truth.json" # synthetic fixture ground truth
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DETECTIONS_JSON = WORK_DIR / "detections.json" # marker detections (phase 6 / M19, contract #3)
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TRACK_TRUTH_JSON = WORK_DIR / "track_truth.json" # synthetic marker ground truth (phase 6 / M18)
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# ---------------------------------------------------------------------------
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# Constants
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# ---------------------------------------------------------------------------
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FRONTEND_ORIGINS = [
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"http://localhost:5173",
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"http://127.0.0.1:5173",
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]
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# Local-only, single-user, offline tool: allow any localhost origin so a Vite dev server on
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# a fallback port (5174, …) still works. Kept alongside the explicit 5173 default.
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FRONTEND_ORIGIN_REGEX = r"http://(localhost|127\.0\.0\.1)(:\d+)?"
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API_HOST = "127.0.0.1"
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API_PORT = 8000
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AUDIO_SAMPLE_RATE = 16_000 # ingest extracts mono 16 kHz for sync (M1)
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# Synthetic fixture parameters (M0). Ground-truth offsets are deliberately odd,
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# non-round numbers so a naive integer-second guesser can't accidentally "pass".
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SYNTH_VIDEO_W = 640
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SYNTH_VIDEO_H = 360
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SYNTH_FPS = 30
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SYNTH_DURATION_S = 20.0
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SYNTH_AUDIO_SR = 48_000
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SYNTH_OFFSETS_MS = (0.0, 1370.0, -842.0) # cam0 is the reference (offset 0)
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def t_video_from_global(t_global: float, offset_ms: float, drift_ppm: float = 0.0) -> float:
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"""Map master-timeline seconds to a video's local playhead seconds (FROZEN)."""
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return (t_global - offset_ms / 1000.0) * (1.0 + drift_ppm * 1e-6)
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def t_global_from_video(t_video: float, offset_ms: float, drift_ppm: float = 0.0) -> float:
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"""Inverse of :func:`t_video_from_global` (FROZEN)."""
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return t_video / (1.0 + drift_ppm * 1e-6) + offset_ms / 1000.0
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