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Dylan M. Taylor
56d088bf04
* craft-audio: FilmCraft's FLAC encoder and MP1/MP2 decoder speed-ups FLAC: per-order predictor kernels, merged Rice partition sums, the LPC window kept per block length, and batches consumed by offset (filmcraft 5eaff794, d9dad4a5). The output is unchanged: 64 golden cases hash the same before and after. MP1/MP2: the faster synthesis filterbank (filmcraft 51c755e5), with its bit-exact test. * craft-audio: FilmCraft's AAC and Opus decoder speed-ups and refactors AAC: table-driven Huffman decoding, per-stage FFT twiddles and fused stages, reused per-channel work buffers, and the encoder's memoised per-band work (filmcraft f9627280, d587ceed, 6121635c, dc124ab7, 7a532eca). Opus: radix-2/3/4 FFT kernels in the CELT IMDCT, the PVQ table built once, one de-emphasis loop for both channels, the SILK resampler without per-sample divisions and with eight partial sums, concealment and FEC capped at 120 ms (filmcraft bf7ac420, 12e32026, c4dc64d1, eb352ec8, 87b8e22d, 014b5e56, 78d77b72). The per-frame mid-only flag this crate fixed in the SILK decoder is kept in the refactored decode. * craft-media: Ogg CRC-32 by slice-by-16 FilmCraft's 6763f9bf: sixteen independent lookups per 16 input bytes, so opening a file is several times faster. Checked against a bit-at-a-time reference on every short length and alignment, and across every split. * craft-audio: SoundCraft's CAF cookie-size and FLAC vendor-length checks A CAF magic cookie size above the signed range is refused instead of passed to symphonia (soundcraft 3bd3965), and a Vorbis comment block whose vendor string claims more than the block holds is refused (soundcraft ddfe991). Each with its regression test. * craft-audio: AC-3 reads bits through the shared BitReader FilmCraft's 1c9c2e82: the AC-3 decoder's private bit-at-a-time reader is replaced by craft-media's BitReader, with its two tests: the decoded output of 2,000 synthetic and 12 real syncframes (and their damaged variants) hashes the same as before, and the reader agrees with the old one on random reads, skips and overruns. The three AC-3 features now turn on craft-media's bitstream module. * craft-audio: the quantiser rounds without a libm call SoundCraft's d293336, the audio-io part: round-half-away by integer arithmetic in the bounce's inner loop, with its test against f64::round over the quantiser's range. * craft-audio: flac::Encoder, the FLAC packet encoder, is public FilmCraft muxes FLAC into its own outputs from integer samples, so it needs the encoder below FileEncoder: planar samples in, frames out, and the STREAMINFO to patch in at the end. The module is behind flac-encode, its errors convert to AudioError::Encode, and pending_samples says how long the final frame will be.