ffmpeg | branch: master | Tomas Härdin <g...@haerdin.se> | Fri May 20 14:41:38 2022 +0200| [01827beb70050f117a5cf6a800614b6402db7599] | committer: Tomas Härdin
libavcodec/jpeg2000_parser: LUTify info_marker() This speeds find_frame_end() up by 39% according to valgrind > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=01827beb70050f117a5cf6a800614b6402db7599 --- libavcodec/jpeg2000_parser.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/libavcodec/jpeg2000_parser.c b/libavcodec/jpeg2000_parser.c index 20672fbf46..4cb7db4225 100644 --- a/libavcodec/jpeg2000_parser.c +++ b/libavcodec/jpeg2000_parser.c @@ -65,13 +65,25 @@ static inline void reset_context(JPEG2000ParserContext *m) */ static uint8_t info_marker(uint16_t marker) { - if (marker == 0xFF92 || marker == 0xFF4F || - marker == 0xFF90 || marker == 0xFF93 || - marker == 0xFFD9) - return 0; - else - if (marker > 0xFF00) return 1; - return 0; + static const uint8_t lut[256] = { + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, // 0xFF4F + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 0xFF90 0xFF92 0xFF93 + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, // 0xFFD9 + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + }; + return marker < 0xFF00 ? 0 : lut[marker & 0xFF]; } /** _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
