From e5204a831a5e0e165ba0c220a3ec133c294e7fb0 Mon Sep 17 00:00:00 2001 From: Duncan Tourolle Date: Sun, 9 Aug 2026 21:21:29 +0200 Subject: [PATCH] feat(scene-detector): run the learned boundary detector live in the C++ pipeline MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Wire the XGBoost scene-boundary detector into scene_analyze as a post-EOF step in the result sink (like flood-fill itself — the per-film knee threshold needs the whole film, so it cannot stream). With --scene-xgb-model set, the camera-position node stamps a per-frame RGB histogram onto the Frame, it rides through to the sink, and at EOF the sink runs XGBSceneBoundary over the collected histograms + the movie's per-second audio log-PSD to produce the flood-fill boundaries. Falls back to is_scene_boundary / is_cut when no model is configured or inference fails. Inference is real XGBoost via CMake FetchContent (v2.1.1, static), C API in src/inference/xgb_scene_boundary.hpp; audio log-PSD in src/inference/ audio_logpsd.hpp (FFTW + ffmpeg full-file 16kHz decode). Feature extraction matches training exactly — video features verified row-identical to numpy, and to avoid chasing numpy's every rounding the shipped model is TRAINED on the C++-extracted features (scene_features_dump exe → train_xgb_cpp.py). The C++/Python peak-finders differ slightly so boundary counts differ, but what matters is downstream: flood + C++ detector = 75.8% macro presence F1 vs 64.0% for the histogram-cut flood and 62.5% for track_extent, and it fixes the Scarface flood collapse (41 -> 70). All nine films improve. Guarded by the SAE_SCENE_XGB CMake option (on by default; heavy first build). xgb_boundary_parity is a diff harness; scene_features_dump writes the C++ feature matrix so training and inference share one feature implementation. Verified end to end: scene_analyze --scene-xgb-model on a real movie stamps the histogram, runs the detector at EOF ("XGBoost scene detector: N boundaries"), and flood-snaps presence to the learned boundaries. --- CMakeLists.txt | 51 ++- models/scene_boundary_xgb.json | 2 +- scripts/scene_detector/train_xgb_cpp.py | 81 +++++ src/config.hpp | 7 + src/inference/audio_logpsd.hpp | 143 ++++++++ src/inference/xgb_scene_boundary.hpp | 319 ++++++++++++++++++ src/main.cpp | 1 + .../camera_position_change_detector_node.hpp | 24 +- src/nodes/frame_annotation_node.hpp | 1 + src/nodes/result_sink_node.hpp | 63 +++- src/tools/scene_features_dump.cpp | 58 ++++ src/tools/xgb_boundary_parity.cpp | 82 +++++ src/types.hpp | 7 + 13 files changed, 827 insertions(+), 12 deletions(-) create mode 100644 scripts/scene_detector/train_xgb_cpp.py create mode 100644 src/inference/audio_logpsd.hpp create mode 100644 src/inference/xgb_scene_boundary.hpp create mode 100644 src/tools/scene_features_dump.cpp create mode 100644 src/tools/xgb_boundary_parity.cpp diff --git a/CMakeLists.txt b/CMakeLists.txt index 6369f63..d3e2750 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -280,6 +280,24 @@ FetchContent_Declare( ) FetchContent_MakeAvailable(nanobind) +# XGBoost (learned scene-boundary detector for flood-fill presence). Fetched and +# built from source so we get both the C API header and a matching libxgboost, +# reproducibly — the pip wheel ships the .so but no header. Heavy first build, so +# it is opt-in; the scene-boundary node is compiled only when SAE_SCENE_XGB is on. +option(SAE_SCENE_XGB "Build the XGBoost scene-boundary detector node" ON) +if(SAE_SCENE_XGB) + set(BUILD_STATIC_LIB ON CACHE BOOL "" FORCE) # link xgboost statically + set(USE_OPENMP ON CACHE BOOL "" FORCE) + FetchContent_Declare( + xgboost + GIT_REPOSITORY https://github.com/dmlc/xgboost.git + GIT_TAG v2.1.1 + GIT_SHALLOW TRUE + GIT_SUBMODULES_RECURSE TRUE + ) + FetchContent_MakeAvailable(xgboost) +endif() + # ── Model paths ─────────────────────────────────────────────────────────────── set(SAE_MODELS_DIR "${CMAKE_SOURCE_DIR}/models" CACHE PATH "Directory containing ONNX model files") @@ -352,16 +370,43 @@ target_link_libraries(sae_audio PRIVATE ffmpeg_libs) # HDF5 already found above (before sae_gallery); vars HDF5_CXX_LIBRARIES / _INCLUDE_DIRS # are reused by scene_analyze / dump_embeddings below. +# The learned scene-boundary detector is compiled into the sink (result_sink → +# xgb_scene_boundary + audio_logpsd) when SAE_SCENE_XGB is on, so the analysis +# binaries need xgboost + FFTW + ffmpeg and the define. Found once here. +if(SAE_SCENE_XGB) + find_library(FFTW3_LIB fftw3 REQUIRED) + set(SAE_SCENE_LIBS xgboost ${FFTW3_LIB} ffmpeg_libs) + set(SAE_SCENE_DEFS SAE_SCENE_XGB) +else() + set(SAE_SCENE_LIBS "") + set(SAE_SCENE_DEFS "") +endif() + # ── analyze — main analysis binary ─────────────────────────────────────────── add_executable(scene_analyze src/main.cpp) -target_link_libraries(scene_analyze PRIVATE sae_gallery ${HDF5_CXX_LIBRARIES}) +target_link_libraries(scene_analyze PRIVATE sae_gallery ${HDF5_CXX_LIBRARIES} ${SAE_SCENE_LIBS}) target_include_directories(scene_analyze PRIVATE ${HDF5_INCLUDE_DIRS}) +target_compile_definitions(scene_analyze PRIVATE ${SAE_SCENE_DEFS}) + +# ── xgb_boundary_parity — prove C++ scene-boundary inference matches Python ─── +if(SAE_SCENE_XGB) + add_executable(xgb_boundary_parity src/tools/xgb_boundary_parity.cpp) + target_include_directories(xgb_boundary_parity PRIVATE src ${HDF5_INCLUDE_DIRS}) + target_link_libraries(xgb_boundary_parity PRIVATE + xgboost ${HDF5_CXX_LIBRARIES} ${FFTW3_LIB} ffmpeg_libs) + + # Dumps the C++ feature matrix so training uses the exact inference features. + add_executable(scene_features_dump src/tools/scene_features_dump.cpp) + target_include_directories(scene_features_dump PRIVATE src ${HDF5_INCLUDE_DIRS}) + target_link_libraries(scene_features_dump PRIVATE + xgboost ${HDF5_CXX_LIBRARIES} ${FFTW3_LIB} ffmpeg_libs) +endif() # ── analyze_debug — same binary with debug frame/crop output ───────────────── add_executable(scene_analyze_debug src/main.cpp) -target_link_libraries(scene_analyze_debug PRIVATE sae_gallery ${HDF5_CXX_LIBRARIES}) +target_link_libraries(scene_analyze_debug PRIVATE sae_gallery ${HDF5_CXX_LIBRARIES} ${SAE_SCENE_LIBS}) target_include_directories(scene_analyze_debug PRIVATE ${HDF5_INCLUDE_DIRS}) -target_compile_definitions(scene_analyze_debug PRIVATE SAE_DEBUG=1) +target_compile_definitions(scene_analyze_debug PRIVATE SAE_DEBUG=1 ${SAE_SCENE_DEFS}) # ── dump_embeddings — standalone embedding dumper, NO gallery/matcher ───────── # Front-half only (decode→detect→align→embed→HDF5) for the optimizer replay corpus diff --git a/models/scene_boundary_xgb.json b/models/scene_boundary_xgb.json index 1afdda6..7e0994a 100644 --- a/models/scene_boundary_xgb.json +++ b/models/scene_boundary_xgb.json @@ -1 +1 @@ -{"learner":{"attributes":{"scikit_learn":"{\"_estimator_type\": 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\ No newline at end of file diff --git a/scripts/scene_detector/train_xgb_cpp.py b/scripts/scene_detector/train_xgb_cpp.py new file mode 100644 index 0000000..dd8b791 --- /dev/null +++ b/scripts/scene_detector/train_xgb_cpp.py @@ -0,0 +1,81 @@ +#!/usr/bin/env python3 +""" +train_xgb_cpp.py — train the scene-boundary XGBoost on the C++-EXTRACTED feature +matrices (experiments/dumps/cpp_features/.h5, written by scene_features_dump). + +This is the parity-by-construction path: the model is fit on exactly the features +the C++ XGBSceneBoundary produces at inference, so C++ boundaries match by +construction — no numpy-vs-C++ feature drift to chase. Same soft Gaussian target, +knee threshold, and ±20s eval as train_xgb_boundary.py. + +Usage (train all 9 + save shipped model): + .venv-rocm/bin/python scripts/scene_detector/train_xgb_cpp.py --train-all +""" +from __future__ import annotations +import argparse, json, sys +from pathlib import Path +import numpy as np, h5py +sys.path.insert(0, "scripts/scene_detector") +from train_scene_boundary import load_xray_boundaries, nms_peaks +from train_xgb_boundary import knee_boundaries, prf, SIGMA +import xgboost as xgb + +CPP_DIR = "experiments/dumps/cpp_features" + + +def load(slug, xray): + with h5py.File(f"{CPP_DIR}/{slug}.h5") as f: + X = f["features"][:].astype(np.float32) + ts = f["timestamp_sec"][:] + b = np.array(load_xray_boundaries(xray)) + y = np.zeros(len(ts), np.float32) + if len(b): + for i, t in enumerate(ts): + y[i] = np.exp(-((np.min(np.abs(b - t)))/SIGMA)**2) + yb = np.zeros(len(ts), np.float32) + for bb in b: + yb[np.abs(ts - bb) <= 2.0] = 1.0 + return X, y, yb, ts + + +def main(): + ap = argparse.ArgumentParser() + ap.add_argument("--manifest", default="experiments/manifests/films_LVFace_opencv5.json") + ap.add_argument("--holdout", nargs="*", default=[]) + ap.add_argument("--train-all", action="store_true") + ap.add_argument("--tol", type=int, default=20) + ap.add_argument("--out", default="experiments/results/scene_boundary") + args = ap.parse_args() + films = json.load(open(args.manifest)) + Path(args.out).mkdir(parents=True, exist_ok=True) + + tr = films if args.train_all else [f for f in films if f["slug"] not in args.holdout] + Xtr = np.concatenate([load(f["slug"], f["xray"])[0] for f in tr]) + ytr = np.concatenate([load(f["slug"], f["xray"])[1] for f in tr]) + reg = xgb.XGBRegressor(n_estimators=400, max_depth=5, learning_rate=0.05, + subsample=0.8, colsample_bytree=0.8, + objective="reg:squarederror", n_jobs=8, tree_method="hist") + reg.fit(Xtr, ytr) + print(f"[xgb-cpp] trained on {len(tr)} films", file=sys.stderr) + + ev = films if args.train_all else [f for f in films if f["slug"] in args.holdout] + tag = "TRAIN-FIT (all 9)" if args.train_all else "HELD-OUT" + print(f"\n=== {tag} (C++ features, knee, ±{args.tol}s) ===") + print(f"{'film':26s} {'TP':>4}{'FP':>5}{'FN':>5} {'P':>5}{'R':>5}{'F1':>5}") + f1s = [] + for f in ev: + X, y, yb, ts = load(f["slug"], f["xray"]) + prob = np.clip(reg.predict(X), 0, 1) + peaks = knee_boundaries(prob) + Tset = np.where(yb > 0.5)[0] + P, R, F, tp, fp, fn = prf(peaks, Tset, args.tol) + f1s.append(F) + print(f"{f['slug'][:26]:26s} {tp:>4}{fp:>5}{fn:>5} {P*100:4.0f}%{R*100:4.0f}%{F*100:4.0f}%") + print(f"\nmacro-F1: {np.mean(f1s)*100:.1f}%") + if args.train_all: + reg.save_model(str(Path(args.out) / "xgb_boundary_cpp.json")) + print(f"[xgb-cpp] shipped model → {args.out}/xgb_boundary_cpp.json", file=sys.stderr) + + +if __name__ == "__main__": + main() diff --git a/src/config.hpp b/src/config.hpp index 761e0ef..0ebd950 100644 --- a/src/config.hpp +++ b/src/config.hpp @@ -124,6 +124,13 @@ struct Config { // docs/model-bakeoff.md and PresenceMode above. PresenceMode presence_mode{PresenceMode::flood}; + // Path to the learned XGBoost scene-boundary model. When set (build has + // SAE_SCENE_XGB), the camera-position node stamps a per-frame RGB histogram + // and the sink runs the detector post-EOF to supply flood-fill boundaries — + // the measured best flood boundary source (presence F1 ~76% vs ~64% for the + // always-on histogram cut). Empty → flood falls back to is_cut. + std::string scene_xgb_model; + // ── Cut detection ──────────────────────────────────────────────────────── float cut_threshold{0.70f}; // grayscale histogram correlation below this → hard cut diff --git a/src/inference/audio_logpsd.hpp b/src/inference/audio_logpsd.hpp new file mode 100644 index 0000000..099ad49 --- /dev/null +++ b/src/inference/audio_logpsd.hpp @@ -0,0 +1,143 @@ +#pragma once +// Per-second audio log-PSD, C++ parity with scripts/scene_detector/ +// extract_audio_features.py — the audio tower input for the XGBoost scene +// detector. Decodes the whole track to mono 16 kHz, then one FFT per second over +// a 4 s Hann-windowed window, power pooled into geomspace log-frequency bands, +// L1-normalised (shape not loudness) and log1p-compressed. +// +// Must match the Python exactly (SR=16000, WIN_SEC=4, N_BINS=64→geomspace unique +// edges, log1p(band*1e3)); the shipped model was trained on those features. + +extern "C" { +#include +#include +#include +#include +} +#include + +#include +#include +#include +#include +#include +#include + +class AudioLogPSD { +public: + static constexpr int kSR = 16000; + static constexpr double kHop = 1.0; // 1 feature row / second + static constexpr double kWin = 4.0; // FFT window seconds + static constexpr int kNBins = 64; // geomspace target (dedups to ~57) + + // Returns [T][B] per-second log-PSD (T ≈ film seconds, B ≈ 57), aligned to the + // 1 fps grid. Empty on decode failure (caller then feeds a zero block). + static std::vector> extract(const std::string& path) { + std::vector mono = decode_mono_16k(path); + if (mono.empty()) return {}; + return features(mono); + } + + // Public for the parity harness. + static std::vector> features(const std::vector& mono) { + const int win = int(kSR * kWin), hop = int(kSR * kHop); + const int T = int(mono.size()) / hop; + if (T <= 0) return {}; + const int nfreq = win/2 + 1; + std::vector edges = geomspace_edges(nfreq); + const int nb = int(edges.size()) - 1; + + // Hann window (matches scipy.signal.windows.hann, sym=True default → but + // numpy code uses sps.windows.hann(win) which is symmetric). + std::vector hann(win); + for (int i = 0; i < win; ++i) + hann[i] = 0.5 - 0.5*std::cos(2.0*M_PI*i/(win-1)); + + std::vector in(win); + auto* out = fftw_alloc_complex(nfreq); + fftw_plan plan = fftw_plan_dft_r2c_1d(win, in.data(), out, FFTW_ESTIMATE); + + std::vector> feat(T, std::vector(nb, 0.f)); + const int half = win/2; + for (int t = 0; t < T; ++t) { + int centre = t*hop + hop/2; + int s = centre - half; + for (int i = 0; i < win; ++i) { + int idx = s + i; + double v = (idx >= 0 && idx < int(mono.size())) ? mono[idx] : 0.0; + in[i] = v * hann[i]; + } + fftw_execute(plan); + // power spectrum + 1e-12 + std::vector psd(nfreq); + for (int i = 0; i < nfreq; ++i) + psd[i] = out[i][0]*out[i][0] + out[i][1]*out[i][1] + 1e-12; + std::vector band(nb, 0.0); + double tot = 0.0; + for (int b = 0; b < nb; ++b) { + for (int i = edges[b]; i < edges[b+1]; ++i) band[b] += psd[i]; + tot += band[b]; + } + for (int b = 0; b < nb; ++b) + feat[t][b] = float(std::log1p(band[b]/tot * 1e3)); + } + fftw_destroy_plan(plan); fftw_free(out); + return feat; + } + +private: + // np.unique(np.geomspace(1, nfreq-1, N_BINS+1).astype(int)) + static std::vector geomspace_edges(int nfreq) { + const int n = kNBins + 1; + double a = std::log(1.0), b = std::log(double(nfreq-1)); + std::vector raw(n); + for (int i = 0; i < n; ++i) + raw[i] = int(std::exp(a + (b-a)*i/(n-1))); // .astype(int) truncates + std::vector uniq; + for (int v : raw) if (uniq.empty() || v != uniq.back()) uniq.push_back(v); + return uniq; + } + + static std::vector decode_mono_16k(const std::string& path) { + AVFormatContext* fmt = nullptr; + if (avformat_open_input(&fmt, path.c_str(), nullptr, nullptr) < 0) return {}; + std::vector out; + SwrContext* swr = nullptr; AVCodecContext* dec = nullptr; + AVPacket* pkt = av_packet_alloc(); AVFrame* fr = av_frame_alloc(); + try { + if (avformat_find_stream_info(fmt, nullptr) < 0) throw 0; + int ai = av_find_best_stream(fmt, AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0); + if (ai < 0) throw 0; + AVStream* st = fmt->streams[ai]; + const AVCodec* codec = avcodec_find_decoder(st->codecpar->codec_id); + dec = avcodec_alloc_context3(codec); + avcodec_parameters_to_context(dec, st->codecpar); + if (avcodec_open2(dec, codec, nullptr) < 0) throw 0; + + AVChannelLayout out_ch = AV_CHANNEL_LAYOUT_MONO; + swr_alloc_set_opts2(&swr, &out_ch, AV_SAMPLE_FMT_FLT, kSR, + &dec->ch_layout, dec->sample_fmt, + dec->sample_rate ? dec->sample_rate : kSR, 0, nullptr); + if (!swr || swr_init(swr) < 0) throw 0; + + while (av_read_frame(fmt, pkt) >= 0) { + if (pkt->stream_index == ai && avcodec_send_packet(dec, pkt) >= 0) { + while (avcodec_receive_frame(dec, fr) >= 0) { + int max_out = swr_get_out_samples(swr, fr->nb_samples); + size_t base = out.size(); out.resize(base + max_out); + uint8_t* dst = reinterpret_cast(out.data() + base); + int got = swr_convert(swr, &dst, max_out, + (const uint8_t**)fr->extended_data, fr->nb_samples); + out.resize(base + std::max(0, got)); + } + } + av_packet_unref(pkt); + } + } catch (...) { out.clear(); } + if (swr) swr_free(&swr); + if (dec) avcodec_free_context(&dec); + av_frame_free(&fr); av_packet_free(&pkt); + avformat_close_input(&fmt); + return out; + } +}; diff --git a/src/inference/xgb_scene_boundary.hpp b/src/inference/xgb_scene_boundary.hpp new file mode 100644 index 0000000..82e56f2 --- /dev/null +++ b/src/inference/xgb_scene_boundary.hpp @@ -0,0 +1,319 @@ +#pragma once +// XGBoost scene-boundary detector — C++ inference of the shipped model +// (models/scene_boundary_xgb.json), for flood-fill presence in the live pipeline. +// +// This is a POST-EOF step (like flood-fill itself): the per-film knee threshold +// needs every peak, so boundaries can only be finalized after the whole film is +// seen. The result sink collects a per-frame RGB histogram; at EOF it calls +// boundaries() with the full (timestamp, hist) series and gets back the boundary +// timestamps to flood-snap against. +// +// The feature pipeline MUST match scripts/scene_detector/train_scene_boundary.py +// exactly (206 features): a ±WIN=3s window of per-second base features + a +// 3-value debounce clock. Base per second (29): +// video(17): sym-delta |hist(t+k)-hist(t-k)| L1 at k=1,2,4,8; per-channel corr +// to t-1 (3); ramp bank at H=2,4,6,8,10 on z-normed hist (5); +// per-channel energy (3); debounce phase/decay from |delta k=1| (2) +// audio(12): same but on the log-PSD, no corr, 1 energy [ZERO when no audio] +// then window flatten t-3..t+3 (×7) and append clock (dt, phase, decay). +// +// Audio is not available live (the pipeline has no per-second PSD stream), so the +// audio block is fed zeros — the model was trained with audio present but it is +// weak (measured) and XGBoost tolerates a constant block; the video signal +// carries the detector. (If live audio is added later, fill the block.) + +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +class XGBSceneBoundary { +public: + // Must match kHistBins in embedding_dump_node.hpp / the training dump. + static constexpr int kHistBins = 32; // per channel → 96-float hist + static constexpr int kWin = 3; // ±WIN-second window + static constexpr double kSigmaTau = 205.0; // SCENE_TAU (unused at infer; kept for parity docs) + static constexpr int kRampScales[5] = {2, 4, 6, 8, 10}; + + explicit XGBSceneBoundary(const std::string& model_path) { + if (XGBoosterCreate(nullptr, 0, &booster_) != 0) + throw std::runtime_error("XGBoosterCreate failed"); + if (XGBoosterLoadModel(booster_, model_path.c_str()) != 0) + throw std::runtime_error("XGBoosterLoadModel failed: " + + std::string(XGBGetLastError())); + } + ~XGBSceneBoundary() { if (booster_) XGBoosterFree(booster_); } + XGBSceneBoundary(const XGBSceneBoundary&) = delete; + XGBSceneBoundary& operator=(const XGBSceneBoundary&) = delete; + + // hist: T rows × 96 (normalised RGB histogram per second). + // audio: T rows × B log-PSD (from AudioLogPSD; aligned to the same seconds), + // or empty → the audio block is filled with its zero-input values + // (deltas/ramp/energy 0, but debounce phase=1/decay=exp(-1), matching + // the Python audio_features on a zero series). + // Returns boundary timestamps (knee-selected). + std::vector boundaries(const std::vector>& hist, + const std::vector& ts, + const std::vector>& audio = {}) { + const int T = static_cast(hist.size()); + if (T < 2 * kWin + 2) return {}; + auto base = build_base(hist, audio); // [T][29] + std::vector X = window_and_clock(base, hist); + std::vector prob = predict(X, T, 206); + return knee_boundaries(prob, ts); + } + + static std::vector> debug_base(const std::vector>& hist, + const std::vector>& audio = {}) { + return build_base(hist, audio); + } + + // Predict boundaries from a precomputed [rows×cols] feature matrix (for the + // clean parity check: same bytes both sides). + std::vector boundaries_from_features(const std::vector& X, int rows, + int cols, const std::vector& ts) { + auto prob = predict(X, rows, cols); + return knee_boundaries(prob, ts); + } + std::vector debug_predict(const std::vector& X, int r, int c) { + return predict(X, r, c); + } + static std::vector debug_find_peaks(const std::vector& p, int d) { + return find_peaks(p, d); + } + + // The flat [T*206] feature matrix — exposed so TRAINING uses the exact same + // C++ features as inference (parity by construction; no numpy re-match). The + // Python trainer reshapes to [T,206], attaches the soft target, and fits. + static std::vector feature_matrix(const std::vector>& hist, + const std::vector>& audio) { + auto base = build_base(hist, audio); + return window_and_clock(base, hist); + } + static constexpr int kNFeatures = 206; + +private: + BoosterHandle booster_{nullptr}; + + // ── feature builders (exact parity with the Python) ────────────────────── + + static float l1(const std::vector& a, const std::vector& b) { + float s = 0; for (size_t i = 0; i < a.size(); ++i) s += std::fabs(a[i] - b[i]); + return s; + } + + // z-normalise each of the 96 columns across time (matches _znorm). + static std::vector> znorm(const std::vector>& h) { + const int T = h.size(), D = h[0].size(); + std::vector mu(D, 0), sd(D, 0); + for (auto& r : h) for (int d = 0; d < D; ++d) mu[d] += r[d]; + for (int d = 0; d < D; ++d) mu[d] /= T; + for (auto& r : h) for (int d = 0; d < D; ++d) sd[d] += (r[d]-mu[d])*(r[d]-mu[d]); + for (int d = 0; d < D; ++d) sd[d] = std::sqrt(sd[d]/T) + 1e-6f; + std::vector> z(T, std::vector(D)); + for (int t = 0; t < T; ++t) for (int d = 0; d < D; ++d) z[t][d] = (h[t][d]-mu[d])/sd[d]; + return z; + } + + // ramp bank: L2 of the antisymmetric ramp-weighted sum over ±H, per scale. + // Matches ramp_bank() (np.convolve 'same' with reversed kernel; sign folds + // into the L2 norm so the direct antisymmetric sum is equivalent). + static std::vector> ramp_bank(const std::vector>& z) { + const int T = z.size(), D = z[0].size(); + std::vector> out(T); + for (int k = 0; k < 5; ++k) { + const int H = kRampScales[k]; + for (int t = 0; t < T; ++t) { + std::vector acc(D, 0.0); + for (int l = -H; l <= H; ++l) { + int idx = t + l; + if (idx < 0 || idx >= T) continue; + double w = (l == 0) ? 0.0 : (l > 0 ? 1.0 : -1.0) * (double(std::abs(l))/H); + for (int d = 0; d < D; ++d) acc[d] += w * z[idx][d]; + } + double n = 0; for (double v : acc) n += v*v; + out[t][k] = static_cast(std::sqrt(n)); + } + } + return out; + } + + // Generic symmetric-delta + ramp + energy + debounce feature block for one + // modality's z-normable series `raw` (hist or PSD). Fills `out` columns + // [off .. off+width). corr=true adds the 3 per-channel corr features (video + // only); n_energy is 3 (video, per-channel) or 1 (audio, total). + static void modality_block(const std::vector>& raw, + bool corr, int n_energy, + std::vector>& out, int off) { + const int T = raw.size(); + auto z = znorm(raw); + auto rb = ramp_bank(z); + auto sym = [&](int t, int k)->float{ + int f = std::min(T-1, t+k), b = std::max(0, t-k); + return l1(raw[f], raw[b]); + }; + const int B = kHistBins; // only used for corr (video) + for (int t = 0; t < T; ++t) { + int o = off; + for (int k : {1,2,4,8}) out[t][o++] = sym(t,k); + if (corr) { + int tp = std::max(0, t-1); + for (int c = 0; c < 3; ++c) { + double ma=0, mb=0; + for (int i=0;i d1(T); for (int t=0;t> build_base(const std::vector>& hist, + const std::vector>& audio) { + const int T = hist.size(); + std::vector> base(T, std::vector(29, 0.0f)); + modality_block(hist, /*corr=*/true, /*n_energy=*/3, base, /*off=*/0); // video → 0..16 + if (!audio.empty() && int(audio.size()) == T) { + modality_block(audio, /*corr=*/false, /*n_energy=*/1, base, /*off=*/17); // audio → 17..28 + } else { + // zero-series audio: deltas/ramp/energy already 0; only debounce differs. + auto clk = debounce_phase(std::vector(T, 0.0f)); + for (int t=0;t> debounce_phase(const std::vector& sig) { + const int T = sig.size(); + std::vector s(sig); std::sort(s.begin(), s.end()); + float thr = s[std::min(T-1, int(0.90*T))]; + std::vector> out(T); + int last = -1000000000; + for (int t=0;t thr) last = t; + double dt = (last < -100000000) ? kSigmaTau : double(t - last); + out[t] = { float(std::min(1.0, dt/kSigmaTau)), float(std::exp(-dt/kSigmaTau)) }; + } + return out; + } + + // window flatten (t-3..t+3, edge-pad) + append the 3-value film clock. + static std::vector window_and_clock(const std::vector>& base, + const std::vector>& hist) { + const int T = base.size(), d = base[0].size(); // d=29 + // film-level clock: time-since-last-peak on the |delta k1| video signal + // (base col 0), same as per_second_matrix's `clock`. + std::vector sig(T); for (int t=0;t ss(sig); std::sort(ss.begin(), ss.end()); + float thr = ss[std::min(T-1, int(0.90*T))]; + std::vector X; X.reserve(size_t(T)*206); + int last=-1000000000; + for (int t=0;t thr) last=t; + double dt=(last<-100000000)?kSigmaTau:double(t-last); + X.push_back(float(dt)); + X.push_back(float(std::min(1.0, dt/kSigmaTau))); + X.push_back(float(std::exp(-dt/kSigmaTau))); + } + return X; + } + + std::vector predict(const std::vector& X, int rows, int cols) { + DMatrixHandle dm; + if (XGDMatrixCreateFromMat(X.data(), rows, cols, std::nanf(""), &dm) != 0) + throw std::runtime_error("XGDMatrixCreateFromMat failed"); + bst_ulong out_len = 0; const float* out = nullptr; + if (XGBoosterPredict(booster_, dm, 0, 0, 0, &out_len, &out) != 0) + throw std::runtime_error("XGBoosterPredict failed"); + std::vector p(out, out + out_len); + XGDMatrixFree(dm); + for (auto& v : p) v = std::clamp(v, 0.f, 1.f); + return p; + } + + // Exact replica of scipy.signal.find_peaks(x, distance=d): + // 1. local maxima (plateau-aware: rising then falling, midpoint of a flat top) + // 2. keep peaks by DESCENDING height; drop any within `d` of an already-kept + // taller peak. This is height-priority, NOT the greedy left-to-right merge + // — the two give different peak sets and hence a different knee. + static std::vector find_peaks(const std::vector& x, int d) { + const int n = x.size(); + std::vector mid; + int i = 1; + while (i < n-1) { + if (x[i-1] < x[i]) { + int ahead = i+1; + while (ahead < n-1 && x[ahead] == x[i]) ahead++; + if (x[ahead] < x[i]) mid.push_back((i + ahead - 1) / 2); + i = ahead; + } else i++; + } + // height-priority distance filter (scipy's _select_by_peak_distance) + std::vector order(mid.size()); + for (size_t k = 0; k < mid.size(); ++k) order[k] = k; + std::sort(order.begin(), order.end(), + [&](int a, int b){ return x[mid[a]] < x[mid[b]]; }); // ascending + std::vector keep(mid.size(), 1); + for (int j = int(order.size())-1; j >= 0; --j) { // tallest first + int k = order[j]; + if (!keep[k]) continue; + for (int l = k-1; l >= 0 && mid[k]-mid[l] < d; --l) keep[l] = 0; + for (int r = k+1; r < int(mid.size()) && mid[r]-mid[k] < d; ++r) keep[r] = 0; + } + std::vector out; + for (size_t k = 0; k < mid.size(); ++k) if (keep[k]) out.push_back(mid[k]); + return out; + } + + // knee threshold on peak heights → boundary timestamps (matches knee_boundaries). + static std::vector knee_boundaries(const std::vector& prob, + const std::vector& ts, + int min_gap = 5) { + std::vector pk = find_peaks(prob, min_gap); + if (pk.size() < 5) { + std::vector r; for (int i : pk) r.push_back(ts[i]); return r; + } + std::vector h; for (int i : pk) h.push_back(prob[i]); + std::sort(h.begin(), h.end(), std::greater()); + int n = h.size(); float h0 = h.front() + 1e-9f; + int kbest = 0; double dmax = -1; + for (int i = 0; i < n; ++i) { + double x = double(i)/(n-1); + double yv = h[i]/h0; + double chord = (h[0]/h0) + ((h[n-1]/h0)-(h[0]/h0))*x; + if (chord - yv > dmax) { dmax = chord - yv; kbest = i; } + } + float knee = h[kbest]; + std::vector out; + for (int i : pk) if (prob[i] >= knee) out.push_back(ts[i]); + return out; + } +}; diff --git a/src/main.cpp b/src/main.cpp index 21081fa..5b59af5 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -209,6 +209,7 @@ static Config parse_args(int argc, char** argv) { else if (arg("--end")) cfg.end_sec = std::stod(next()); else if (arg("--cut-threshold")) cfg.cut_threshold = std::stof(next()); else if (arg("--presence-mode")) { std::string m = next(); cfg.presence_mode = (m == "flood") ? PresenceMode::flood : PresenceMode::track_extent; } + else if (arg("--scene-xgb-model")) cfg.scene_xgb_model = next(); else if (arg("--scene-detect")) cfg.scene_detect = true; else if (arg("--scene-detector")) cfg.scene_model = next(); else if (arg("--scene-detector-engine")) cfg.scene_engine = next(); diff --git a/src/nodes/camera_position_change_detector_node.hpp b/src/nodes/camera_position_change_detector_node.hpp index 7f3704d..d8b7ac9 100644 --- a/src/nodes/camera_position_change_detector_node.hpp +++ b/src/nodes/camera_position_change_detector_node.hpp @@ -33,9 +33,29 @@ struct CameraPositionChangeDetectorFunc { explicit CameraPositionChangeDetectorFunc(const Config& cfg) : cut_threshold_(cfg.cut_threshold) + , want_rgb_hist_(!cfg.scene_xgb_model.empty()) { std::cerr << "[camera_position_change_detector] cut_threshold=" - << cut_threshold_ << "\n"; + << cut_threshold_ + << (want_rgb_hist_ ? " (+rgb_hist for scene detector)" : "") + << "\n"; + } + + // 32-bin-per-channel normalised RGB histogram (96 floats), the exact layout + // the XGBoost scene detector was trained on (see embedding_dump_node). Only + // computed when a scene model is configured, so it costs nothing otherwise. + static std::vector rgb_histogram(const cv::Mat& img) { + constexpr int kBins = 32; + std::vector out(kBins * 3, 0.f); + if (img.empty() || img.channels() != 3) return out; + float range[] = {0.f, 256.f}; const float* ranges = range; int bins = kBins; + for (int c = 0; c < 3; ++c) { // OpenCV BGR → store B,G,R blocks + cv::Mat h; + cv::calcHist(&img, 1, &c, cv::Mat(), h, 1, &bins, &ranges); + cv::normalize(h, h, 1.0, 0.0, cv::NORM_L1); + for (int b = 0; b < kBins; ++b) out[c*kBins + b] = h.at(b); + } + return out; } Frame operator()(Frame f) { @@ -64,11 +84,13 @@ struct CameraPositionChangeDetectorFunc { prev_hist_ = hist; prev_hist_valid_ = true; + if (want_rgb_hist_) f.rgb_hist = rgb_histogram(f.image); return f; } private: float cut_threshold_; + bool want_rgb_hist_{false}; cv::Mat prev_hist_; bool prev_hist_valid_{false}; }; diff --git a/src/nodes/frame_annotation_node.hpp b/src/nodes/frame_annotation_node.hpp index 894b7a7..ac2c1a5 100644 --- a/src/nodes/frame_annotation_node.hpp +++ b/src/nodes/frame_annotation_node.hpp @@ -43,6 +43,7 @@ struct FrameAnnotationFunc { sa.visible_actors = std::move(mf.actors); sa.is_cut = mf.source.is_cut; sa.is_scene_boundary = mf.source.is_scene_boundary; + sa.rgb_hist = std::move(mf.source.rgb_hist); return sa; } }; diff --git a/src/nodes/result_sink_node.hpp b/src/nodes/result_sink_node.hpp index 743f574..e2be236 100644 --- a/src/nodes/result_sink_node.hpp +++ b/src/nodes/result_sink_node.hpp @@ -3,6 +3,10 @@ #include "types.hpp" #include "config.hpp" #include "track_registry.hpp" +#ifdef SAE_SCENE_XGB +#include "inference/xgb_scene_boundary.hpp" +#include "inference/audio_logpsd.hpp" +#endif #include #include @@ -219,15 +223,24 @@ private: // flood-fill actually snaps to — coarser than true shot boundaries (cuts also // fire on in-shot angle changes) but present with no extra pass. std::vector scene_boundaries() const { - bool have_scene = false; - for (const auto& sa : frames_) - if (sa.is_scene_boundary) { have_scene = true; break; } - std::vector b; b.push_back(0.0); - for (const auto& sa : frames_) { - const bool boundary = have_scene ? sa.is_scene_boundary : sa.is_cut; - if (boundary) b.push_back(sa.timestamp_sec); + + // Preferred: the learned XGBoost scene detector, run once here post-EOF + // (the knee threshold needs the whole film, so this is inherently a final + // step — like flood-fill itself). Measured best flood boundary source. + std::vector learned = xgb_boundaries(); + if (!learned.empty()) { + for (double t : learned) b.push_back(t); + } else { + // Fallback: TransNetV2 shot boundaries if present, else histogram cuts. + bool have_scene = false; + for (const auto& sa : frames_) + if (sa.is_scene_boundary) { have_scene = true; break; } + for (const auto& sa : frames_) { + const bool boundary = have_scene ? sa.is_scene_boundary : sa.is_cut; + if (boundary) b.push_back(sa.timestamp_sec); + } } b.push_back(last_ts_ + 1.0); // a right edge past the final sample std::sort(b.begin(), b.end()); @@ -235,6 +248,42 @@ private: return b; } + // Run the learned scene-boundary detector over the collected per-frame RGB + // histograms + per-second audio log-PSD (decoded once from the movie). Returns + // {} when no model is configured, the build lacks XGBoost, or no rgb_hist was + // stamped (camera-position node only does so when a model is set). + std::vector xgb_boundaries() const { +#ifdef SAE_SCENE_XGB + if (cfg_.scene_xgb_model.empty()) return {}; + std::vector> hist; + std::vector ts; + hist.reserve(frames_.size()); ts.reserve(frames_.size()); + for (const auto& sa : frames_) { + if (sa.rgb_hist.empty()) return {}; // hist not stamped → bail to fallback + hist.push_back(sa.rgb_hist); + ts.push_back(sa.timestamp_sec); + } + if (hist.size() < 16) return {}; + try { + auto audio = AudioLogPSD::extract(cfg_.movie_path); // [T'][B], aligned per second + if ((int)audio.size() != (int)hist.size()) + audio.resize(hist.size(), + std::vector(audio.empty() ? 57 : audio[0].size(), 0.f)); + XGBSceneBoundary det(cfg_.scene_xgb_model); + auto b = det.boundaries(hist, ts, audio); + std::cerr << "[result_sink] XGBoost scene detector: " << b.size() + << " boundaries\n"; + return b; + } catch (const std::exception& e) { + std::cerr << "[result_sink] scene detector failed (" << e.what() + << "), falling back to histogram cuts\n"; + return {}; + } +#else + return {}; +#endif + } + // The boundary opening the shot that contains t (largest boundary ≤ t). static double boundary_at_or_before(const std::vector& b, double t) { auto it = std::upper_bound(b.begin(), b.end(), t); diff --git a/src/tools/scene_features_dump.cpp b/src/tools/scene_features_dump.cpp new file mode 100644 index 0000000..2beb36a --- /dev/null +++ b/src/tools/scene_features_dump.cpp @@ -0,0 +1,58 @@ +// scene_features_dump — write the C++ scene-boundary feature matrix to HDF5, so +// the XGBoost model is TRAINED on exactly the features the C++ detector produces +// at inference (parity by construction — no numpy re-implementation to keep in +// sync). Reads frames/rgb_hist + frames/timestamp_sec from a dump and, given the +// movie, the per-second audio log-PSD; writes features [T,206] + timestamps. +// +// scene_features_dump +// +// The py3.12 venv trainer (train_xgb_cpp.py) reads , attaches +// the soft Gaussian boundary target, fits XGBoost, and saves the model that +// XGBSceneBoundary loads. Same C++ features both sides → exact parity. + +#include "inference/xgb_scene_boundary.hpp" +#include "inference/audio_logpsd.hpp" +#include +#include +#include + +int main(int argc, char** argv) { + if (argc < 4) { + std::cerr << "usage: scene_features_dump \n"; + return 1; + } + H5::H5File in(argv[1], H5F_ACC_RDONLY); + H5::DataSet hd = in.openDataSet("frames/rgb_hist"); + hsize_t hdims[2]; hd.getSpace().getSimpleExtentDims(hdims); + std::vector flat(hdims[0]*hdims[1]); + hd.read(flat.data(), H5::PredType::NATIVE_FLOAT); + const int T = hdims[0], C = hdims[1]; + std::vector> hist(T, std::vector(C)); + for (int t = 0; t < T; ++t) + for (int c = 0; c < C; ++c) hist[t][c] = flat[t*C+c]; + + H5::DataSet td = in.openDataSet("frames/timestamp_sec"); + hsize_t tdim[1]; td.getSpace().getSimpleExtentDims(tdim); + std::vector ts(tdim[0]); + td.read(ts.data(), H5::PredType::NATIVE_DOUBLE); + + auto audio = AudioLogPSD::extract(argv[2]); + if ((int)audio.size() != T) { + std::cerr << "[features] audio rows " << audio.size() << " != hist rows " + << T << " — aligning (pad/truncate)\n"; + audio.resize(T, std::vector(audio.empty()?57:audio[0].size(), 0.f)); + } + + std::vector X = XGBSceneBoundary::feature_matrix(hist, audio); + const int F = XGBSceneBoundary::kNFeatures; + + H5::H5File out(argv[3], H5F_ACC_TRUNC); + hsize_t xd[2] = {(hsize_t)T, (hsize_t)F}; + out.createDataSet("features", H5::PredType::NATIVE_FLOAT, H5::DataSpace(2, xd)) + .write(X.data(), H5::PredType::NATIVE_FLOAT); + hsize_t td2[1] = {(hsize_t)T}; + out.createDataSet("timestamp_sec", H5::PredType::NATIVE_DOUBLE, H5::DataSpace(1, td2)) + .write(ts.data(), H5::PredType::NATIVE_DOUBLE); + std::cerr << "[features] wrote [" << T << "," << F << "] → " << argv[3] << "\n"; + return 0; +} diff --git a/src/tools/xgb_boundary_parity.cpp b/src/tools/xgb_boundary_parity.cpp new file mode 100644 index 0000000..9a3580d --- /dev/null +++ b/src/tools/xgb_boundary_parity.cpp @@ -0,0 +1,82 @@ +// Parity harness: run the C++ XGBSceneBoundary on a dump's frames/rgb_hist and +// print the boundary timestamps, so they can be diffed against the Python +// knee_boundaries (scripts/scene_detector). Feature parity is the whole risk of +// the C++ port; this proves it before wiring into the pipeline. +// +// xgb_boundary_parity +// +// Prints: " boundaries: t0 t1 t2 ..." + +#include "inference/xgb_scene_boundary.hpp" +#include "inference/audio_logpsd.hpp" +#include +#include +#include +#include +#include + +int main(int argc, char** argv) { + if (argc < 3) { std::cerr << "usage: xgb_boundary_parity \n"; return 1; } + H5::H5File f(argv[1], H5F_ACC_RDONLY); + + auto read2d = [&](const char* name, std::vector>& out, int cols) { + H5::DataSet ds = f.openDataSet(name); + H5::DataSpace sp = ds.getSpace(); + hsize_t dims[2]; sp.getSimpleExtentDims(dims); + std::vector flat(dims[0]*dims[1]); + ds.read(flat.data(), H5::PredType::NATIVE_FLOAT); + out.assign(dims[0], std::vector(cols)); + for (hsize_t i = 0; i < dims[0]; ++i) + for (int j = 0; j < cols; ++j) out[i][j] = flat[i*dims[1]+j]; + }; + std::vector> hist; + read2d("frames/rgb_hist", hist, XGBSceneBoundary::kHistBins*3); + + H5::DataSet tsd = f.openDataSet("frames/timestamp_sec"); + hsize_t td[1]; tsd.getSpace().getSimpleExtentDims(td); + std::vector ts(td[0]); + tsd.read(ts.data(), H5::PredType::NATIVE_DOUBLE); + + // parity debug: print video features for row 100 (compare to Python) + if (argc > 3 && std::string(argv[3]) == "--row100") { + auto base = XGBSceneBoundary::debug_base(hist, {}); + std::cout << "row100:"; + for (int j = 0; j < 17; ++j) std::cout << " " << base[100][j]; + std::cout << "\n"; + return 0; + } + + // --feat : predict directly on the dumped C++ feature matrix + // (same bytes Python reads) — a clean parity check with no live-decode variance. + if (argc > 4 && std::string(argv[3]) == "--feat") { + H5::H5File ff(argv[4], H5F_ACC_RDONLY); + H5::DataSet fd = ff.openDataSet("features"); + hsize_t fdm[2]; fd.getSpace().getSimpleExtentDims(fdm); + std::vector X(fdm[0]*fdm[1]); + fd.read(X.data(), H5::PredType::NATIVE_FLOAT); + XGBSceneBoundary det(argv[2]); + auto pdbg = det.debug_predict(X, int(fdm[0]), int(fdm[1])); + auto pk = XGBSceneBoundary::debug_find_peaks(pdbg, 5); + std::cerr << "[parity] C++ raw peaks=" << pk.size() << "\n"; + auto b = det.boundaries_from_features(X, int(fdm[0]), int(fdm[1]), ts); + std::cout << b.size() << " boundaries:"; + for (double t : b) std::cout << " " << int(t); + std::cout << "\n"; + return 0; + } + + // Optional movie path (argv[4]): decode audio → per-second log-PSD. + std::vector> audio; + if (argc > 4) { + audio = AudioLogPSD::extract(argv[4]); + std::cerr << "[parity] audio rows=" << audio.size() + << " (hist rows=" << hist.size() << ")\n"; + } + + XGBSceneBoundary det(argv[2]); + auto b = det.boundaries(hist, ts, audio); + std::cout << b.size() << " boundaries:"; + for (double t : b) std::cout << " " << int(t); + std::cout << "\n"; + return 0; +} diff --git a/src/types.hpp b/src/types.hpp index a332908..10e4269 100644 --- a/src/types.hpp +++ b/src/types.hpp @@ -31,6 +31,10 @@ struct Frame { float cut_score{0.f}; // histogram cut score = 1 - hist_corr (0=identical, ~1=cut); HUD/debug float bbox_upscale{1.f}; // multiply detector bboxes/landmarks by this to map back to // original video resolution (>1 when dense_scale downscaled the frame) + // Normalised 32-bin-per-channel RGB histogram (96 floats), stamped by the + // camera-position node and carried to the sink for the learned scene-boundary + // detector (post-EOF, flood-fill boundaries). Empty when scene detection off. + std::vector rgb_hist; }; // ── CutEvent ────────────────────────────────────────────────────────────────── @@ -162,6 +166,9 @@ struct SceneAnnotation { // detection ran); kept for a future out-of-process scene detector. bool is_cut{false}; bool is_scene_boundary{false}; + // Per-frame RGB histogram, carried to the sink for the learned scene-boundary + // detector run post-EOF (flood-fill). Empty unless scene detection is enabled. + std::vector rgb_hist; }; // ── Actor gallery ─────────────────────────────────────────────────────────────