diff options
| author | Tomas Härdin <git@haerdin.se> | 2022-05-20 14:41:38 +0200 |
|---|---|---|
| committer | Tomas Härdin <git@haerdin.se> | 2022-06-10 10:50:12 +0200 |
| commit | 01827beb70050f117a5cf6a800614b6402db7599 (patch) | |
| tree | 72b8c1e660c9b8a9e6363c7eb3a6d49025f5a8bd | |
| parent | 6704c2dd1903215f89e78dd1293247d798f58886 (diff) | |
libavcodec/jpeg2000_parser: LUTify info_marker()
This speeds find_frame_end() up by 39% according to valgrind
| -rw-r--r-- | libavcodec/jpeg2000_parser.c | 26 |
1 files 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]; } /** |