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Fix a tsan error bug in frame parallel decode.

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A frame may be waiting for an out of border pixel from another
frame. A frame's row progress variable is set to -1 when start being decoded
and another frame may be waiting for -2 row pixel from this frame.
In this case, vp9_frameworker_wait will return directly and skip the waiting
which leads to tsan error between threads.

Change-Id: Id16604915fb598b823e34393f696e3aa46fb6422
This commit is contained in:
hkuang 2015-03-03 12:57:26 -08:00
parent 1790d45252
commit a723f5ecd1
1 changed files with 2 additions and 2 deletions
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4
vp9/decoder/vp9_decodeframe.c
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@ -1927,7 +1927,7 @@ void dec_build_inter_predictors(VP9Decoder *const pbi, MACROBLOCKD *xd,
// pixels of each superblock row can be changed by next superblock row.
if (pbi->frame_parallel_decode)
vp9_frameworker_wait(pbi->frame_worker_owner, ref_frame_buf,
(y1 + 7) << (plane == 0 ? 0 : 1));
MAX(0, (y1 + 7) << (plane == 0 ? 0 : 1)));
// Skip border extension if block is inside the frame.
if (x0 < 0 || x0 > frame_width - 1 || x1 < 0 || x1 > frame_width - 1 ||
@ -1983,7 +1983,7 @@ void dec_build_inter_predictors(VP9Decoder *const pbi, MACROBLOCKD *xd,
// pixels of each superblock row can be changed by next superblock row.
if (pbi->frame_parallel_decode)
vp9_frameworker_wait(pbi->frame_worker_owner, ref_frame_buf,
(y1 + 7) << (plane == 0 ? 0 : 1));
MAX(0, (y1 + 7) << (plane == 0 ? 0 : 1)));
}
#if CONFIG_VP9_HIGHBITDEPTH
if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {