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Simplify MV parsing, removes laying out 2 or 4 (16x8/8x8/8x16) MVs over all 

16 subblocks (since we no longer need that), which should also lead to a
minor speedup.

Originally committed as revision 23854 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/n0.8
Ronald S. Bultje 15 years ago
parent
7c4dcf8165
commit
7ed06b2be8
2 changed files with 41 additions and 29 deletions
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  1. +36
    -27
      libavcodec/vp8.c
  2. +5
    -2
      libavcodec/vp8data.h

+ 36
- 27
libavcodec/vp8.c View File

@@ -599,44 +599,54 @@ static const uint8_t *get_submv_prob(const VP56mv *left, const VP56mv *top)

/**
* Split motion vector prediction, 16.4.
* @returns the number of motion vectors parsed (2, 4 or 16)
*/
static void decode_splitmvs(VP8Context *s, VP56RangeCoder *c,
static int decode_splitmvs(VP8Context *s, VP56RangeCoder *c,
VP8Macroblock *mb, VP56mv *base_mv)
{
int part_idx = mb->partitioning =
vp8_rac_get_tree(c, vp8_mbsplit_tree, vp8_mbsplit_prob);
int n, num = vp8_mbsplit_count[part_idx];
VP56mv part_mv[16];
const uint8_t *mbsplits = vp8_mbsplits[part_idx],
*firstidx = vp8_mbfirstidx[part_idx];

for (n = 0; n < num; n++) {
int k = vp8_mbfirstidx[part_idx][n];
const VP56mv *left = (k & 3) ? &mb->bmv[k - 1] : &mb[-1].bmv[k + 3],
*above = (k > 3) ? &mb->bmv[k - 4] : &mb[-s->mb_stride].bmv[k + 12];
const uint8_t *submv_prob = get_submv_prob(left, above);
int k = firstidx[n];
const VP56mv *left, *above;
const uint8_t *submv_prob;

if (!(k & 3)) {
VP8Macroblock *left_mb = &mb[-1];
left = &left_mb->bmv[vp8_mbsplits[left_mb->partitioning][k + 3]];
} else
left = &mb->bmv[mbsplits[k - 1]];
if (k <= 3) {
VP8Macroblock *above_mb = &mb[-s->mb_stride];
above = &above_mb->bmv[vp8_mbsplits[above_mb->partitioning][k + 12]];
} else
above = &mb->bmv[mbsplits[k - 4]];

submv_prob = get_submv_prob(left, above);

switch (vp8_rac_get_tree(c, vp8_submv_ref_tree, submv_prob)) {
case VP8_SUBMVMODE_NEW4X4:
part_mv[n].y = base_mv->y + read_mv_component(c, s->prob->mvc[0]);
part_mv[n].x = base_mv->x + read_mv_component(c, s->prob->mvc[1]);
mb->bmv[n].y = base_mv->y + read_mv_component(c, s->prob->mvc[0]);
mb->bmv[n].x = base_mv->x + read_mv_component(c, s->prob->mvc[1]);
break;
case VP8_SUBMVMODE_ZERO4X4:
part_mv[n].x = 0;
part_mv[n].y = 0;
mb->bmv[n].x = 0;
mb->bmv[n].y = 0;
break;
case VP8_SUBMVMODE_LEFT4X4:
part_mv[n] = *left;
mb->bmv[n] = *left;
break;
case VP8_SUBMVMODE_TOP4X4:
part_mv[n] = *above;
mb->bmv[n] = *above;
break;
}

/* fill out over the 4x4 blocks in MB */
for (k = 0; k < 16; k++)
if (vp8_mbsplits[part_idx][k] == n) {
mb->bmv[k] = part_mv[n];
}
}

return num;
}

static inline void decode_intra4x4_modes(VP56RangeCoder *c, uint8_t *intra4x4,
@@ -698,8 +708,7 @@ static void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_mvinter, p);
switch (mb->mode) {
case VP8_MVMODE_SPLIT:
decode_splitmvs(s, c, mb, &best);
mb->mv = mb->bmv[15];
mb->mv = mb->bmv[decode_splitmvs(s, c, mb, &best) - 1];
break;
case VP8_MVMODE_ZERO:
mb->mv.x = 0;
@@ -717,8 +726,8 @@ static void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
break;
}
if (mb->mode != VP8_MVMODE_SPLIT) {
for (n = 0; n < 16; n++)
mb->bmv[n] = mb->mv;
mb->partitioning = VP8_SPLITMVMODE_NONE;
mb->bmv[0] = mb->mv;
}
} else {
// intra MB, 16.1
@@ -1040,23 +1049,23 @@ static void inter_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 0, 16, 8, width, height, &mb->bmv[0]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 8, 16, 8, width, height, &mb->bmv[8]);
0, 8, 16, 8, width, height, &mb->bmv[1]);
break;
case VP8_SPLITMVMODE_8x16:
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 0, 8, 16, width, height, &mb->bmv[0]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
8, 0, 8, 16, width, height, &mb->bmv[2]);
8, 0, 8, 16, width, height, &mb->bmv[1]);
break;
case VP8_SPLITMVMODE_8x8:
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 0, 8, 8, width, height, &mb->bmv[0]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
8, 0, 8, 8, width, height, &mb->bmv[2]);
8, 0, 8, 8, width, height, &mb->bmv[1]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 8, 8, 8, width, height, &mb->bmv[8]);
0, 8, 8, 8, width, height, &mb->bmv[2]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
8, 8, 8, 8, width, height, &mb->bmv[10]);
8, 8, 8, 8, width, height, &mb->bmv[3]);
break;
}
}


+ 5
- 2
libavcodec/vp8data.h View File

@@ -67,6 +67,7 @@ enum inter_splitmvmode {
VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal)
VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each
VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each
VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs
};

static const uint8_t vp8_pred4x4_mode[] =
@@ -119,7 +120,7 @@ static const int8_t vp8_small_mvtree[7][2] = {
{ -6, -7 } // '110', '111'
};

static const uint8_t vp8_mbsplits[4][16] = {
static const uint8_t vp8_mbsplits[5][16] = {
{ 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1 },
{ 0, 0, 1, 1, 0, 0, 1, 1,
@@ -127,7 +128,9 @@ static const uint8_t vp8_mbsplits[4][16] = {
{ 0, 0, 1, 1, 0, 0, 1, 1,
2, 2, 3, 3, 2, 2, 3, 3 },
{ 0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15 }
8, 9, 10, 11, 12, 13, 14, 15 },
{ 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0 }
};

static const uint8_t vp8_mbfirstidx[4][16] = {


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