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[FFmpeg-devel,0/2] 32bps FLAC patches

Message ID 20220726194107.316153-1-mvanb1@gmail.com
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Series 32bps FLAC patches | expand

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Martijn van Beurden July 26, 2022, 7:41 p.m. UTC 
Recently libFLAC gained the ability (not in any released version yet
though) 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. The decoding patch has been send in for review earlier,
but didn't get any feedback yet, so I'm sending it in again,
unchanged, this time with a patch for encoding too.

Martijn van Beurden (2):
  libavcodec/flacdec: Implement decoding of 32 bit-per-sample PCM
  libavcodec/flacenc: Implement encoding of 32 bit-per-sample PCM

 libavcodec/flac.c       |   4 +-
 libavcodec/flacdec.c    | 248 ++++++++++++++++++--
 libavcodec/flacenc.c    | 499 ++++++++++++++++++++++++++++++++--------
 libavcodec/get_bits.h   |  12 +
 libavcodec/mathops.h    |   9 +
 libavcodec/put_bits.h   |   7 +
 libavcodec/put_golomb.h |  19 +-
 7 files changed, 668 insertions(+), 130 deletions(-)