atracdenc/src/atrac, branch fix_input_file_path

Add MSYS2 build support (#70)

2026-05-03T12:41:21Z

* Add MSYS2 build support Add a selectable PCM I/O backend so MSVC builds can keep Media Foundation while MSYS2/MinGW builds use libsndfile. Teach the libsndfile finder about MINGW_PREFIX and add a Windows MSYS2 CI job that builds the libsndfile backend. Fix and enable tests for MSYS2 builds

atrac3: reimplement tonal encoding. Use flatness-based tonal extraction

2026-04-19T22:27:45Z

- Add shared CalcSpectralFlatnessPerBfu helper in atrac_psy_common with BFU-table mapping. - Implement ATRAC3 tonal extraction: compute MDCT energy, estimate per-BFU flatness, extract up to 5-bin strongest tonal run in low-flatness BFUs, and zero extracted bins in residual. - Map extracted tonal bins into TTonalBlocks and integrate them into bitstream coding. - Update ATRAC3 bit allocation - reduce residual bits for BFUs with tonal blocks, and increase tonal quantizer selection. - Restore --notonal CLI option in main.cpp for A/B comparison.

[AT3] refactor bitstream allocation loop to bs_encode

2026-04-11T21:20:06Z

Fix Windows C++17 build and MSVC flag warnings

2026-04-08T22:12:05Z

atrac3: add YAML gain control debug logging (--yaml-log)

2026-04-08T21:33:40Z

Inspired by edge264's YAML logging approach (FOSDEM 2026): emit every gain control decision as a self-contained YAML stream so any frame can be grep'd, analyzed with Python, or used to craft custom test curves. ./atracdenc -e atrac3 -i in.wav -o out.oma --yaml-log gain.yaml Each YAML document covers one frame (frame:/time: header) with channels and bands nested below. Per-band fields emitted in pipeline order: high_freq_ratio, overlap_ratio, dynamic_min_score, gain[], next_level pcm_qmf (256 raw QMF samples, non-modulated, non-windowed) curve_raw, rms_cur, rms_next_mod, point0_level, crossover curve_final, max_gain, ratio, level_boost, scale_boost, total_boost gain_boost (or skip: at each early-exit point) New files / changes: src/yaml_log.h - TYamlFmtGuard (stream format RAII), YamlWriteFloatSeq (vector + ptr/len overloads) src/atrac/at3/atrac3.h - YamlLog field in TAtrac3EncoderSettings src/atrac3denc.h - FrameNum counter + YamlLog pointer on TAtrac3Encoder src/atrac3denc.cpp - frame header in GetLambda, incremental YAML in CreateSubbandInfo at every decision point src/main.cpp - --yaml-log CLI flag Co-Authored-By: Claude Sonnet 4.6

atrac3: ratio-scored transients, per-band gain boost, pre-echo reduction

2026-03-15T20:13:24Z

Rewrites the ATRAC3 gain control pipeline to eliminate noise flashes and substantially reduce pre-echo artifacts: Transient detection & curve building (transient_detector.cpp/h): - Replace legacy heuristic detector with ratio-scored DetectTransients: score = peak/floor for rising (c/a) or falling (a/c) triplets, scored and ranked, top-N kept, sorted by location - Add explicit point0 derived from windowed-RMS match between bufCur and the curve-modulated bufNext (CalcWindowedRmsAfterCurve) - Replace RegionMax with RegionRMS for smoother region amplitude estimate - Add per-band detection thresholds kMinScorePerBand[4] = {1.9,1.9,2.1,2.2} - Dynamic minScore: scale threshold by min(1.5, max(1.0, overlapRatio)) to suppress false-positive curves when previous frame dominates - Scale constraint: curve[0].Level >= 3 to cap cross-frame amplification at 2x Bit allocation (atrac3_bitstream.cpp/h): - Add GainBoostPerBand[NumQMF] to TSingleChannelElement, computed in CreateSubbandInfo and applied in CalcBitsAllocation - levelBoost: compensate for Demodulate's GainLevel[minLevel] attenuation - scaleBoost: compensate for next-frame cross-frame scale via lookahead - Both capped (kLevelBoostCap=1, kScaleBoostCap=2) to avoid bit starvation Upsampler (atrac3denc.cpp): - Raise cutoff from 600 Hz to 800 Hz for tighter band separation Tests (gain_processor_ut.cpp): - Relax fixed curve shape assertions to ExpectCurveReasonable (bounds checks) - Relax quantization error bound for dense-event spacing (<=128 samples) Results (branch new_psy vs original baseline): riddler: pre-echo worse 43->15/479 frames, 0 flashes spine: pre-echo worse 192->107/1804 frames, 0 flashes Co-Authored-By: Claude Sonnet 4.6

Fix energy calculation for quantization units

2025-09-05T20:08:03Z

Use common bit allocation engine for AT1 mode

2025-07-31T21:40:11Z

This commit also removes handling "bfuidxconst" option and mark it as deprecated. This option actually does not affect encoding speed significantly.

Move implementation details into corresponding dirs (#52)

2025-07-22T20:54:21Z

Clean qmf code. (#51)

2025-07-21T20:39:37Z

- Remove unused TQmf template pcm type parameter - Do not copy buffer twice in the synthesis fb