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avcodec/ffv1enc: Eliminate float/double from find_best_state()

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log2() remains, this can either be replaced by a integer implementation or the table
hardcoded if needed

Tested-by: Anton Khirnov <anton@khirnov.net>
Tested-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-05-27 19:31:33 +02:00
parent 9e4d1549e8
commit 366ef56f7f
5 changed files with 20 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
libavcodec/ffv1enc.c
View File

@ -140,32 +140,31 @@ static void find_best_state(uint8_t best_state[256][256],
const uint8_t one_state[256])
{
int i, j, k, m;
double l2tab[256];
uint32_t l2tab[256];
for (i = 1; i < 256; i++)
l2tab[i] = log2(i / 256.0);
l2tab[i] = log2(i / 256.0) * ((-1<<31) / 8);
for (i = 0; i < 256; i++) {
double best_len[256];
double p = i / 256.0;
uint64_t best_len[256];
for (j = 0; j < 256; j++)
best_len[j] = 1 << 30;
best_len[j] = UINT64_MAX;
for (j = FFMAX(i - 10, 1); j < FFMIN(i + 11, 256); j++) {
double occ[256] = { 0 };
double len = 0;
occ[j] = 1.0;
uint32_t occ[256] = { 0 };
uint64_t len = 0;
occ[j] = UINT32_MAX;
if (!one_state[j])
continue;
for (k = 0; k < 256; k++) {
double newocc[256] = { 0 };
uint32_t newocc[256] = { 0 };
for (m = 1; m < 256; m++)
if (occ[m]) {
len -=occ[m]*( p *l2tab[ m]
+ (1-p)*l2tab[256-m]);
len += (occ[m]*(( i *(uint64_t)l2tab[ m]
+ (256-i)*(uint64_t)l2tab[256-m])>>8)) >> 8;
}
if (len < best_len[k]) {
best_len[k] = len;
@ -173,8 +172,8 @@ static void find_best_state(uint8_t best_state[256][256],
}
for (m = 1; m < 256; m++)
if (occ[m]) {
newocc[ one_state[ m]] += occ[m] * p;
newocc[256 - one_state[256 - m]] += occ[m] * (1 - p);
newocc[ one_state[ m]] += occ[m] * (uint64_t) i >> 8;
newocc[256 - one_state[256 - m]] += occ[m] * (uint64_t)(256 - i) >> 8;
}
memcpy(occ, newocc, sizeof(occ));
}

4
tests/ref/vsynth/vsynth1-ffv1-2pass
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@ -1,4 +1,4 @@
7332cfda96233acc7178b09868c07ad7 *tests/data/fate/vsynth1-ffv1-2pass.avi
2382244 tests/data/fate/vsynth1-ffv1-2pass.avi
266ff859dade888a2c0cfddb29260186 *tests/data/fate/vsynth1-ffv1-2pass.avi
2382240 tests/data/fate/vsynth1-ffv1-2pass.avi
c5ccac874dbf808e9088bc3107860042 *tests/data/fate/vsynth1-ffv1-2pass.out.rawvideo
stddev: 0.00 PSNR:999.99 MAXDIFF: 0 bytes: 7603200/ 7603200

4
tests/ref/vsynth/vsynth2-ffv1-2pass
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@ -1,4 +1,4 @@
2f5af924c6f7de1d4c34ec2dc9fca4ac *tests/data/fate/vsynth2-ffv1-2pass.avi
3530664 tests/data/fate/vsynth2-ffv1-2pass.avi
97b5dc666896cbaf98cec3acfbe0f3fc *tests/data/fate/vsynth2-ffv1-2pass.avi
3530654 tests/data/fate/vsynth2-ffv1-2pass.avi
36d7ca943916e1743cefa609eba0205c *tests/data/fate/vsynth2-ffv1-2pass.out.rawvideo
stddev: 0.00 PSNR:999.99 MAXDIFF: 0 bytes: 7603200/ 7603200

4
tests/ref/vsynth/vsynth3-ffv1-2pass
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@ -1,4 +1,4 @@
5b658e65541539248035c17da5eada3a *tests/data/fate/vsynth3-ffv1-2pass.avi
53522 tests/data/fate/vsynth3-ffv1-2pass.avi
96a6700731a71ee2e05c207e2334ade7 *tests/data/fate/vsynth3-ffv1-2pass.avi
53520 tests/data/fate/vsynth3-ffv1-2pass.avi
a038ad7c3c09f776304ef7accdea9c74 *tests/data/fate/vsynth3-ffv1-2pass.out.rawvideo
stddev: 0.00 PSNR:999.99 MAXDIFF: 0 bytes: 86700/ 86700

4
tests/ref/vsynth/vsynth_lena-ffv1-2pass
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@ -1,4 +1,4 @@
2e1833cf75da113a6fabbaae07ddd455 *tests/data/fate/vsynth_lena-ffv1-2pass.avi
3490450 tests/data/fate/vsynth_lena-ffv1-2pass.avi
c46df7f2b5770564475710f1086cdff6 *tests/data/fate/vsynth_lena-ffv1-2pass.avi
3490446 tests/data/fate/vsynth_lena-ffv1-2pass.avi
dde5895817ad9d219f79a52d0bdfb001 *tests/data/fate/vsynth_lena-ffv1-2pass.out.rawvideo
stddev: 0.00 PSNR:999.99 MAXDIFF: 0 bytes: 7603200/ 7603200