Op vr 28 okt. 2022 om 22:13 schreef Martijn van Beurden <mva...@gmail.com>: > > Op di 11 okt. 2022 om 19:24 schreef Martijn van Beurden <mva...@gmail.com>: > > > > Recently libFLAC gained the ability (first released in FLAC 1.4.0) > > to create FLAC files containing 32-bit int PCM samples. To > > keep complexity reasonable, the choice was made to limit residuals > > to 32-bit integers, which the encoder must make sure of. In case > > the encoder cannot find any predictor of which the residuals fit > > this limit, it must default to using a verbatim subframe. Tests have > > shown that this does not happen often (<0.1% of subframes on a > > music corpus of various styles). See also discussion here: > > https://github.com/ietf-wg-cellar/flac-specification/pull/148 > > > > These two patches implement decoding and encoding following this > > format. > > > > Changes since v1: > > fix copy-paste error in encoder, several invocations of > > lpc_encode_choose_datapath used wrong parameters, making FATE fail as > > compression was less than it should be > > > > Changes since v2: > > Rebased decoder part as it didn't apply anymore > > > > Changes since v3: > > Moved put_golomb part to flacenc.c (as it is now quite specific to FLAC) > > and renamed put_sbits64 to put_sbits63 (and changed assert accordingly) > > > > Changes since v4: > > Fix check of decoded_buffer_33bps malloc. Fix reading of wasted bits > > for 33bps subframe. Add fate test > > > > Changes since v5: > > Slimmed down 32 bps fate flac test from 2 to 1 input file. Replaced > > -strict -2 with -strict experimental in fate and encoder warning. > > > > Changes since v6: > > Deduplicated function bodies with preprocessor macros in both > > encoder and decoder, declared variables in loop body where possible > > and changed ff_ctz to ff_ctzll where necessary > > > > Martijn van Beurden (3): > > libavcodec/flacdec: Implement decoding of 32 bit-per-sample PCM > > libavcodec/flacenc: Implement encoding of 32 bit-per-sample PCM > > fate/flac: Add test of 32 bps encoding/decoding > > > > libavcodec/flac.c | 4 +- > > libavcodec/flacdec.c | 218 ++++++++++++++++-- > > libavcodec/flacenc.c | 480 +++++++++++++++++++++++++++++++--------- > > libavcodec/get_bits.h | 12 + > > libavcodec/mathops.h | 9 + > > libavcodec/put_bits.h | 7 + > > libavcodec/put_golomb.h | 14 -- > > tests/fate/flac.mak | 4 + > > 8 files changed, 602 insertions(+), 146 deletions(-) > > > > Hi all, > > With this email, I would like to renew the attention of the mailing > list for these patches. > > Kind regards, Martijn van Beurden
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