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vangel76andClaude Opus 5.5
be98b9d7f7
Problem: files with E-AC-3 audio (MP4 ec-3, MOV, Matroska A_EAC3, MPEG-TS) imported silent: filmcraft-ac3 refused bsid 11-16. Fix: clean-room E-AC-3 decoding from ATSC A/52:2012 Annex E in filmcraft-ac3: bsi and audfrm syntax, 1/2/3/6-block syncframes, reduced sample rates, frame-based exponent strategies (exponents reused across short syncframes), SNR offset strategies, default band structures, spectral extension (translation, notch filter, noise blending). Independent substream 0 is decoded; dependent substreams and other programs are skipped (7.1 plays as its 5.1 core). AHT and enhanced coupling are refused as unsupported. The audio blocks share the AC-3 path; AC-3 output is unchanged. filmcraft-codecs routes E-AC-3 in MP4/MOV, Matroska and TS to the decoder; the TS splitter joins dependent substream frames to their access unit. Tests: ffmpeg oracle for raw E-AC-3 (64.8-91.0 dB SNR) and in MP4, MOV, Matroska and TS (79.5-91.3 dB, random access identical), mutation fuzz, synthetic frames for headers, substream skipping, refusals and exponent reuse across 1-block syncframes, spectral extension unit tests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
17 lines
379 B
TOML
17 lines
379 B
TOML
[package]
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name = "filmcraft-ac3"
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description = "Clean-room AC-3 and E-AC-3 (Dolby Digital / Dolby Digital Plus, ATSC A/52) audio decoder"
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version.workspace = true
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edition.workspace = true
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license.workspace = true
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rust-version.workspace = true
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[lints]
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workspace = true
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[dependencies]
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thiserror = { workspace = true }
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[dev-dependencies]
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filmcraft-testkit = { workspace = true }
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