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BITSTREAM - CLARIFICATION OF MV SIZE RANGE

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The codec should effectively run with motion vector of range (-2048, 2047)
in full pixels, for sequences of 1080p and below. Add assertions to clarify
this behavior.

Change-Id: Ia0cac28249f587d8f8882205228fa480263ab313
This commit is contained in:
Jingning Han
2013-09-27 17:22:59 -07:00
parent 6c2082db71
commit 6d3bd96607
2 changed files with 17 additions and 1 deletions
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4
vp9/common/vp9_entropymv.h
View File

@@ -73,6 +73,10 @@ extern struct vp9_token vp9_mv_class_encodings[MV_CLASSES];
#define MV_MAX ((1 << MV_MAX_BITS) - 1)
#define MV_VALS ((MV_MAX << 1) + 1)
#define MV_IN_USE_BITS 14
#define MV_UPP ((1 << MV_IN_USE_BITS) - 1)
#define MV_LOW (-(1 << MV_IN_USE_BITS))
extern const vp9_tree_index vp9_mv_class0_tree[2 * CLASS0_SIZE - 2];
extern struct vp9_token vp9_mv_class0_encodings[CLASS0_SIZE];

14
vp9/decoder/vp9_decodemv.c
View File

@@ -522,8 +522,14 @@ static void read_inter_block_mode_info(VP9D_COMP *pbi, MODE_INFO *mi,
assert(!"Invalid inter mode value");
}
mi->bmi[j].as_mv[0].as_int = block[0].as_int;
if (is_compound)
assert(block[0].as_mv.row < MV_UPP && block[0].as_mv.row > MV_LOW);
assert(block[0].as_mv.col < MV_UPP && block[0].as_mv.col > MV_LOW);
if (is_compound) {
mi->bmi[j].as_mv[1].as_int = block[1].as_int;
assert(block[1].as_mv.row < MV_UPP && block[1].as_mv.row > MV_LOW);
assert(block[1].as_mv.col < MV_UPP && block[1].as_mv.col > MV_LOW);
}
if (num_4x4_h == 2)
mi->bmi[j + 2] = mi->bmi[j];
@@ -564,6 +570,12 @@ static void read_inter_block_mode_info(VP9D_COMP *pbi, MODE_INFO *mi,
default:
assert(!"Invalid inter mode value");
}
assert(mv0->as_mv.row < MV_UPP && mv0->as_mv.row > MV_LOW);
assert(mv0->as_mv.col < MV_UPP && mv0->as_mv.col > MV_LOW);
if (is_compound) {
assert(mv1->as_mv.row < MV_UPP && mv1->as_mv.row > MV_LOW);
assert(mv1->as_mv.col < MV_UPP && mv1->as_mv.col > MV_LOW);
}
}
}