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VP8: unroll splitmv decoding tree

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Much faster splitmv mode decoding.

Originally committed as revision 24680 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jason Garrett-Glaser 2010-08-03 10:37:14 +00:00
parent 23117d69c1
commit c5dec7f137
2 changed files with 12 additions and 26 deletions
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25
libavcodec/vp8.c
View File

@ -673,20 +673,19 @@ int decode_splitmvs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb)
submv_prob = get_submv_prob(left, above);
switch (vp8_rac_get_tree(c, vp8_submv_ref_tree, submv_prob)) {
case VP8_SUBMVMODE_NEW4X4:
mb->bmv[n].y = mb->mv.y + read_mv_component(c, s->prob->mvc[0]);
mb->bmv[n].x = mb->mv.x + read_mv_component(c, s->prob->mvc[1]);
break;
case VP8_SUBMVMODE_ZERO4X4:
AV_ZERO32(&mb->bmv[n]);
break;
case VP8_SUBMVMODE_LEFT4X4:
if (vp56_rac_get_prob_branchy(c, submv_prob[0])) {
if (vp56_rac_get_prob_branchy(c, submv_prob[1])) {
if (vp56_rac_get_prob_branchy(c, submv_prob[2])) {
mb->bmv[n].y = mb->mv.y + read_mv_component(c, s->prob->mvc[0]);
mb->bmv[n].x = mb->mv.x + read_mv_component(c, s->prob->mvc[1]);
} else {
AV_ZERO32(&mb->bmv[n]);
}
} else {
AV_WN32A(&mb->bmv[n], above);
}
} else {
AV_WN32A(&mb->bmv[n], left);
break;
case VP8_SUBMVMODE_TOP4X4:
AV_WN32A(&mb->bmv[n], above);
break;
}
}

13
libavcodec/vp8data.h
View File

@ -55,13 +55,6 @@ enum inter_mvmode {
VP8_MVMODE_SPLIT
};
enum inter_submvmode {
VP8_SUBMVMODE_LEFT4X4,
VP8_SUBMVMODE_TOP4X4,
VP8_SUBMVMODE_ZERO4X4,
VP8_SUBMVMODE_NEW4X4
};
enum inter_splitmvmode {
VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical)
VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal)
@ -139,12 +132,6 @@ static const uint8_t vp8_submv_prob[5][3] = {
{ 208, 1, 1 }
};
static const int8_t vp8_submv_ref_tree[3][2] = {
{ -VP8_SUBMVMODE_LEFT4X4, 1 }, // '0'
{ -VP8_SUBMVMODE_TOP4X4, 2 }, // '10'
{ -VP8_SUBMVMODE_ZERO4X4, -VP8_SUBMVMODE_NEW4X4 } // '110', '111'
};
static const uint8_t vp8_pred16x16_prob_intra[4] = { 145, 156, 163, 128 };
static const uint8_t vp8_pred16x16_prob_inter[4] = { 112, 86, 140, 37 };