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Fix crash when PU depth is limited

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When video width or height was not a multiple of the smallest CU size,
no prediction would be performed at the border CUs. Kvazaar would later
crash at an assertion failure when attempting to write the bitstream for
the CU.

Fixed by permitting inter and intra prediction when the CU split is
forced, even if CUs of that size would otherwise be disabled.
This commit is contained in:
Arttu Ylä-Outinen 2017-04-27 10:07:45 +03:00
parent 9130b5107c
commit 2f2405dfe6
1 changed files with 33 additions and 11 deletions
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44
src/search.c
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@ -508,15 +508,21 @@ static double search_cu(encoder_state_t * const state, int x, int y, int depth,
cur_cu->tr_depth = depth > 0 ? depth : 1;
cur_cu->type = CU_NOTSET;
cur_cu->part_size = SIZE_2Nx2N;
// If the CU is completely inside the frame at this depth, search for
// prediction modes at this depth.
if (x + cu_width <= frame->width &&
y + cu_width <= frame->height)
{
bool can_use_inter =
state->frame->slicetype != KVZ_SLICE_I
&& WITHIN(depth, ctrl->cfg.pu_depth_inter.min, ctrl->cfg.pu_depth_inter.max);
int cu_width_inter_min = LCU_WIDTH >> ctrl->cfg.pu_depth_inter.max;
bool can_use_inter = state->frame->slicetype != KVZ_SLICE_I && (
WITHIN(depth, ctrl->cfg.pu_depth_inter.min, ctrl->cfg.pu_depth_inter.max) ||
// When the split was forced because the CTU is partially outside the
// frame, we permit inter coding even if pu_depth_inter would
// otherwise forbid it.
(x & ~(cu_width_inter_min - 1)) + cu_width_inter_min > frame->width ||
(y & ~(cu_width_inter_min - 1)) + cu_width_inter_min > frame->height
);
if (can_use_inter) {
double mode_cost;
@ -566,9 +572,17 @@ static double search_cu(encoder_state_t * const state, int x, int y, int depth,
bool skip_intra = state->encoder_control->cfg.rdo == 0
&& cur_cu->type != CU_NOTSET
&& cost / (cu_width * cu_width) < INTRA_TRESHOLD;
if (!skip_intra
&& WITHIN(depth, ctrl->cfg.pu_depth_intra.min, ctrl->cfg.pu_depth_intra.max))
{
int32_t cu_width_intra_min = LCU_WIDTH >> ctrl->cfg.pu_depth_intra.max;
bool can_use_intra =
WITHIN(depth, ctrl->cfg.pu_depth_intra.min, ctrl->cfg.pu_depth_intra.max) ||
// When the split was forced because the CTU is partially outside
// the frame, we permit intra coding even if pu_depth_intra would
// otherwise forbid it.
(x & ~(cu_width_intra_min - 1)) + cu_width_intra_min > frame->width ||
(y & ~(cu_width_intra_min - 1)) + cu_width_intra_min > frame->height;
if (can_use_intra && !skip_intra) {
int8_t intra_mode;
double intra_cost;
kvz_search_cu_intra(state, x, y, depth, &work_tree[depth],
@ -684,11 +698,17 @@ static double search_cu(encoder_state_t * const state, int x, int y, int depth,
cost += mode_bits * state->lambda;
}
bool can_split_cu =
// If the CU is partially outside the frame, we need to split it even
// if pu_depth_intra and pu_depth_inter would not permit it.
cur_cu->type == CU_NOTSET ||
depth < ctrl->cfg.pu_depth_intra.max ||
(state->frame->slicetype != KVZ_SLICE_I &&
depth < ctrl->cfg.pu_depth_inter.max);
// Recursively split all the way to max search depth.
if (depth < ctrl->cfg.pu_depth_intra.max ||
(depth < ctrl->cfg.pu_depth_inter.max && state->frame->slicetype != KVZ_SLICE_I))
{
if (can_split_cu) {
int half_cu = cu_width / 2;
double split_cost = 0.0;
int cbf = cbf_is_set_any(cur_cu->cbf, depth);
@ -787,6 +807,8 @@ static double search_cu(encoder_state_t * const state, int x, int y, int depth,
(state->tile->lcu_offset_y * LCU_WIDTH) + y + (LCU_WIDTH >> depth),
depth, debug_split, (cur_cu->type==CU_INTRA)?1:0);
assert(cur_cu->type != CU_NOTSET);
return cost;
}