ffmpeg | branch: master | Michael Niedermayer <mich...@niedermayer.cc> | Sun Mar 30 14:55:13 2025 +0200| [98c178837088aea01d0ee8409daf2128a3ef4e83] | committer: Michael Niedermayer
avcodec/ffv1enc: replace 3 double precision log2() by 1 single precision log2() This makes the remap finding heuristic much faster Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=98c178837088aea01d0ee8409daf2128a3ef4e83 --- libavcodec/ffv1enc.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/libavcodec/ffv1enc.c b/libavcodec/ffv1enc.c index a09b31218d..2a188ade77 100644 --- a/libavcodec/ffv1enc.c +++ b/libavcodec/ffv1enc.c @@ -1390,7 +1390,7 @@ static void encode_float32_remap(FFV1Context *f, FFV1SliceContext *sc, int last_mul_index = -1; int mul_count = 1 << log2_mul_count; - score_sum[log2_mul_count] += log2_mul_count; + score_sum[log2_mul_count] += log2_mul_count * log2_mul_count; for (int i= 0; i<pixel_num; i++) { int64_t val = sc->unit[p][i].val; int mul_index = (val + 1LL)*mul_count >> 32; @@ -1414,11 +1414,17 @@ static void encode_float32_remap(FFV1Context *f, FFV1SliceContext *sc, } cost = FFMAX((delta + mul/2) / mul, 1); - score_tab[si] += log2(cost); - if (mul > 1) - score_tab[si] += log2(fabs(delta - cost*mul)+1) * (1 + (mul_count > 1)); + float score = 1; + if (mul > 1) { + score *= (fabs(delta - cost*mul)+1); + if (mul_count > 1) + score *= score; + } + score *= cost; + score *= score; if (mul_index != last_mul_index) - score_tab[si] += 0.5*log2(mul); + score *= mul; + score_tab[si] += log2f(score); } } last_val = val; _______________________________________________ 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".
