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avcodec/ffv1enc: replace 3 double precision log2() by 1 single precision log2()

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This makes the remap finding heuristic much faster

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2025-03-30 14:55:13 +02:00
parent b4d165c68f
commit 98c1788370
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GPG key ID: B18E8928B3948D64
1 changed files with 11 additions and 5 deletions
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16
libavcodec/ffv1enc.c
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@ -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;