Application/Mode/Bandwidth API with OpusEncoder::with_application and
with_mode; SILK analysis-by-synthesis encoder mirroring the decoder's
fixed-point reconstruction with noise feedback, LTP, NLSF quantisation and
per-frame rate control; hybrid CELT from band 17 in the shared range coder;
pre-skip 120 in every mode. Oracle tests against filmcraft-opus and ffmpeg
(native opus + libopus).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
New L0 crate effectcraft-opusenc: clean-room RFC 6716 CELT-only encoder
(fullband 48 kHz, 20 ms packets, mono/stereo as dual L/R stereo, constant
packet size from the bitrate) with the RFC 7845 OpusHead and pre-skip.
Forward low-overlap MDCT, inter/intra coarse energy, fine/final energy,
the decoder's exact allocation, recursive band splitting, PVQ search and
codeword indexing, silence frames.
crates/export depends on it; filmcraft-opus (dev) is the round-trip oracle
in tests/opus_roundtrip.rs, with ffmpeg reading an in-test Ogg Opus file
as a second oracle when installed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Brandon Thomas