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Set default framedelay to min(8, ceil(sqrt(n_threads)))

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This reduces memory usage significantly. Fixes #375.
This commit is contained in:
Ronald S. Bultje
2022-01-10 14:49:11 +00:00
parent f98240139c
commit b562b7f648
1 changed files with 11 additions and 1 deletions
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src/lib.c
+11 -1
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@@ -169,8 +169,18 @@ COLD int dav1d_open(Dav1dContext **const c_out, const Dav1dSettings *const s) {
c->n_tc = s->n_threads ? s->n_threads :
iclip(dav1d_num_logical_processors(c), 1, DAV1D_MAX_THREADS);
/* ceil(sqrt(n)) */
static const uint8_t fc_lut[49] = {
1, /* 1 */
2, 2, 2, /* 2- 4 */
3, 3, 3, 3, 3, /* 5- 9 */
4, 4, 4, 4, 4, 4, 4, /* 10-16 */
5, 5, 5, 5, 5, 5, 5, 5, 5, /* 17-25 */
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, /* 26-36 */
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, /* 37-49 */
};
c->n_fc = s->max_frame_delay ? umin(s->max_frame_delay, c->n_tc) :
umin(c->n_tc, 8);
c->n_tc < 50 ? fc_lut[c->n_tc - 1] : 8; // min(8, ceil(sqrt(n)))
c->fc = dav1d_alloc_aligned(sizeof(*c->fc) * c->n_fc, 32);
if (!c->fc) goto error;