Add a comment to explain the code.
CC: [email protected]
Bug-Id: CID 1194388
---
New version, after a visit at the oracles shrine.
Vittorio
libavcodec/mjpegdec.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index d9a73d8..01e11be 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -964,7 +964,9 @@ static int
mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
if (!Al) {
- s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
+ // s->coefs_finished is a bitmask for coefficients coded
+ // ss and se are parameters telling start and end coefficients
+ s->coefs_finished[c] |= (~0ULL >> (63 - (se - ss))) << ss;
last_scan = !~s->coefs_finished[c];
}
--
1.9.3 (Apple Git-50)
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