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(-) -- 2.30.2 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
