shithub: dav1d

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threading: fix deadlock with multiple tile rows

Tile progress needs to be initilized to starting superblock row of the
tile row. Otherwise tile threads will wait indefinitely for a sb row of
a different tile.

--- a/src/decode.c

+++ b/src/decode.c

@@ -2813,8 +2813,10 @@

                 const int tile_start_off = f->frame_thread.tile_start_off[tile_idx];

                 ts->frame_thread.pal_idx = &f->frame_thread.pal_idx[tile_start_off * 2];

                 ts->frame_thread.cf = &((int32_t *) f->frame_thread.cf)[tile_start_off * 3];

-                if (f->n_tc > 0)

-                    atomic_init(&ts->progress, 0);

+                if (f->n_tc > 0) {

+                    unsigned row_sb_start = f->frame_hdr.tiling.row_start_sb[ts->tiling.row];

+                    atomic_init(&ts->progress, row_sb_start);

+                }

             }

         }

     }