[FFmpeg-devel] [PATCH] avutil/crc: always use precalculated CRC tables for known polynomials
Derek Buitenhuis
derek.buitenhuis at gmail.com
Sun Oct 22 16:08:27 EEST 2017
On 10/22/2017 2:03 PM, James Almer wrote:
> This prevents data races in av_crc_get_table()
>
> Signed-off-by: James Almer <jamrial at gmail.com>
> ---
> libavutil/Makefile | 1 +
> libavutil/crc.c | 295 +-------------
> libavutil/crc_tables.c | 1030 ++++++++++++++++++++++++++++++++++++++++++++++++
> libavutil/crc_tables.h | 33 ++
> 4 files changed, 1066 insertions(+), 293 deletions(-)
> create mode 100644 libavutil/crc_tables.c
> create mode 100644 libavutil/crc_tables.h
Can this be generated at init, or lazily, using ff_thread_once instead of
hardcoding huge tables?
- Derek
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