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ffmpeg/libavcodec/vp9mvs.c
Ronald S. Bultje bd01412313 vp9: fix mvref finding to adhere to bug in libvpx. 
Fixes a particular youtube video that I unfortunately can't share.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
2014-01-24 07:02:56 +01:00

353 lines
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/*
* VP9 compatible video decoder
*
* Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
* Copyright (C) 2013 Clément Bœsch <u pkh me>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "internal.h"
#include "vp56.h"
#include "vp9.h"
#include "vp9data.h"
static av_always_inline void clamp_mv(VP56mv *dst, const VP56mv *src,
VP9Context *s)
{
dst->x = av_clip(src->x, s->min_mv.x, s->max_mv.x);
dst->y = av_clip(src->y, s->min_mv.y, s->max_mv.y);
}
static void find_ref_mvs(VP9Context *s,
VP56mv *pmv, int ref, int z, int idx, int sb)
{
static const int8_t mv_ref_blk_off[N_BS_SIZES][8][2] = {
[BS_64x64] = { { 3, -1 }, { -1, 3 }, { 4, -1 }, { -1, 4 },
{ -1, -1 }, { 0, -1 }, { -1, 0 }, { 6, -1 } },
[BS_64x32] = { { 0, -1 }, { -1, 0 }, { 4, -1 }, { -1, 2 },
{ -1, -1 }, { 0, -3 }, { -3, 0 }, { 2, -1 } },
[BS_32x64] = { { -1, 0 }, { 0, -1 }, { -1, 4 }, { 2, -1 },
{ -1, -1 }, { -3, 0 }, { 0, -3 }, { -1, 2 } },
[BS_32x32] = { { 1, -1 }, { -1, 1 }, { 2, -1 }, { -1, 2 },
{ -1, -1 }, { 0, -3 }, { -3, 0 }, { -3, -3 } },
[BS_32x16] = { { 0, -1 }, { -1, 0 }, { 2, -1 }, { -1, -1 },
{ -1, 1 }, { 0, -3 }, { -3, 0 }, { -3, -3 } },
[BS_16x32] = { { -1, 0 }, { 0, -1 }, { -1, 2 }, { -1, -1 },
{ 1, -1 }, { -3, 0 }, { 0, -3 }, { -3, -3 } },
[BS_16x16] = { { 0, -1 }, { -1, 0 }, { 1, -1 }, { -1, 1 },
{ -1, -1 }, { 0, -3 }, { -3, 0 }, { -3, -3 } },
[BS_16x8] = { { 0, -1 }, { -1, 0 }, { 1, -1 }, { -1, -1 },
{ 0, -2 }, { -2, 0 }, { -2, -1 }, { -1, -2 } },
[BS_8x16] = { { -1, 0 }, { 0, -1 }, { -1, 1 }, { -1, -1 },
{ -2, 0 }, { 0, -2 }, { -1, -2 }, { -2, -1 } },
[BS_8x8] = { { 0, -1 }, { -1, 0 }, { -1, -1 }, { 0, -2 },
{ -2, 0 }, { -1, -2 }, { -2, -1 }, { -2, -2 } },
[BS_8x4] = { { 0, -1 }, { -1, 0 }, { -1, -1 }, { 0, -2 },
{ -2, 0 }, { -1, -2 }, { -2, -1 }, { -2, -2 } },
[BS_4x8] = { { 0, -1 }, { -1, 0 }, { -1, -1 }, { 0, -2 },
{ -2, 0 }, { -1, -2 }, { -2, -1 }, { -2, -2 } },
[BS_4x4] = { { 0, -1 }, { -1, 0 }, { -1, -1 }, { 0, -2 },
{ -2, 0 }, { -1, -2 }, { -2, -1 }, { -2, -2 } },
};
VP9Block *const b = &s->b;
int row = b->row, col = b->col, row7 = b->row7;
const int8_t (*p)[2] = mv_ref_blk_off[b->bs];
#define INVALID_MV 0x80008000U
uint32_t mem = INVALID_MV;
int i;
#define RETURN_DIRECT_MV(mv) \
do { \
uint32_t m = AV_RN32A(&mv); \
if (!idx) { \
AV_WN32A(pmv, m); \
return; \
} else if (mem == INVALID_MV) { \
mem = m; \
} else if (m != mem) { \
AV_WN32A(pmv, m); \
return; \
} \
} while (0)
if (sb >= 0) {
if (sb == 2 || sb == 1) {
RETURN_DIRECT_MV(b->mv[0][z]);
} else if (sb == 3) {
RETURN_DIRECT_MV(b->mv[2][z]);
RETURN_DIRECT_MV(b->mv[1][z]);
RETURN_DIRECT_MV(b->mv[0][z]);
}
#define RETURN_MV(mv) \
do { \
if (sb > 0) { \
VP56mv tmp; \
uint32_t m; \
clamp_mv(&tmp, &mv, s); \
m = AV_RN32A(&tmp); \
if (!idx) { \
AV_WN32A(pmv, m); \
return; \
} else if (mem == INVALID_MV) { \
mem = m; \
} else if (m != mem) { \
AV_WN32A(pmv, m); \
return; \
} \
} else { \
uint32_t m = AV_RN32A(&mv); \
if (!idx) { \
clamp_mv(pmv, &mv, s); \
return; \
} else if (mem == INVALID_MV) { \
mem = m; \
} else if (m != mem) { \
clamp_mv(pmv, &mv, s); \
return; \
} \
} \
} while (0)
if (row > 0) {
VP9MVRefPair *mv = &s->mv[0][(row - 1) * s->sb_cols * 8 + col];
if (mv->ref[0] == ref)
RETURN_MV(s->above_mv_ctx[2 * col + (sb & 1)][0]);
else if (mv->ref[1] == ref)
RETURN_MV(s->above_mv_ctx[2 * col + (sb & 1)][1]);
}
if (col > s->tiling.tile_col_start) {
VP9MVRefPair *mv = &s->mv[0][row * s->sb_cols * 8 + col - 1];
if (mv->ref[0] == ref)
RETURN_MV(s->left_mv_ctx[2 * row7 + (sb >> 1)][0]);
else if (mv->ref[1] == ref)
RETURN_MV(s->left_mv_ctx[2 * row7 + (sb >> 1)][1]);
}
i = 2;
} else {
i = 0;
}
// previously coded MVs in the neighborhood, using same reference frame
for (; i < 8; i++) {
int c = p[i][0] + col, r = p[i][1] + row;
if (c >= s->tiling.tile_col_start && c < s->cols &&
r >= 0 && r < s->rows) {
VP9MVRefPair *mv = &s->mv[0][r * s->sb_cols * 8 + c];
if (mv->ref[0] == ref)
RETURN_MV(mv->mv[0]);
else if (mv->ref[1] == ref)
RETURN_MV(mv->mv[1]);
}
}
// MV at this position in previous frame, using same reference frame
if (s->use_last_frame_mvs) {
VP9MVRefPair *mv = &s->mv[1][row * s->sb_cols * 8 + col];
if (mv->ref[0] == ref)
RETURN_MV(mv->mv[0]);
else if (mv->ref[1] == ref)
RETURN_MV(mv->mv[1]);
}
#define RETURN_SCALE_MV(mv, scale) \
do { \
if (scale) { \
VP56mv mv_temp = { -mv.x, -mv.y }; \
RETURN_MV(mv_temp); \
} else { \
RETURN_MV(mv); \
} \
} while (0)
// previously coded MVs in the neighborhood, using different reference frame
for (i = 0; i < 8; i++) {
int c = p[i][0] + col, r = p[i][1] + row;
if (c >= s->tiling.tile_col_start && c < s->cols &&
r >= 0 && r < s->rows) {
VP9MVRefPair *mv = &s->mv[0][r * s->sb_cols * 8 + c];
if (mv->ref[0] != ref && mv->ref[0] >= 0)
RETURN_SCALE_MV(mv->mv[0],
s->signbias[mv->ref[0]] != s->signbias[ref]);
if (mv->ref[1] != ref && mv->ref[1] >= 0 &&
// BUG - libvpx has this condition regardless of whether
// we used the first ref MV and pre-scaling
AV_RN32A(&mv->mv[0]) != AV_RN32A(&mv->mv[1])) {
RETURN_SCALE_MV(mv->mv[1],
s->signbias[mv->ref[1]] != s->signbias[ref]);
}
}
}
// MV at this position in previous frame, using different reference frame
if (s->use_last_frame_mvs) {
VP9MVRefPair *mv = &s->mv[1][row * s->sb_cols * 8 + col];
if (mv->ref[0] != ref && mv->ref[0] >= 0)
RETURN_SCALE_MV(mv->mv[0],
s->signbias[mv->ref[0]] != s->signbias[ref]);
if (mv->ref[1] != ref && mv->ref[1] >= 0 &&
// BUG - libvpx has this condition regardless of whether
// we used the first ref MV and pre-scaling
AV_RN32A(&mv->mv[0]) != AV_RN32A(&mv->mv[1])) {
RETURN_SCALE_MV(mv->mv[1],
s->signbias[mv->ref[1]] != s->signbias[ref]);
}
}
AV_ZERO32(pmv);
#undef INVALID_MV
#undef RETURN_MV
#undef RETURN_SCALE_MV
}
static av_always_inline int read_mv_component(VP9Context *s, int idx, int hp)
{
int bit, sign = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].sign);
int n, c = vp8_rac_get_tree(&s->c, ff_vp9_mv_class_tree,
s->prob.p.mv_comp[idx].classes);
s->counts.mv_comp[idx].sign[sign]++;
s->counts.mv_comp[idx].classes[c]++;
if (c) {
int m;
for (n = 0, m = 0; m < c; m++) {
bit = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].bits[m]);
n |= bit << m;
s->counts.mv_comp[idx].bits[m][bit]++;
}
n <<= 3;
bit = vp8_rac_get_tree(&s->c, ff_vp9_mv_fp_tree,
s->prob.p.mv_comp[idx].fp);
n |= bit << 1;
s->counts.mv_comp[idx].fp[bit]++;
if (hp) {
bit = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].hp);
s->counts.mv_comp[idx].hp[bit]++;
n |= bit;
} else {
n |= 1;
// bug in libvpx - we count for bw entropy purposes even if the
// bit wasn't coded
s->counts.mv_comp[idx].hp[1]++;
}
n += 8 << c;
} else {
n = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].class0);
s->counts.mv_comp[idx].class0[n]++;
bit = vp8_rac_get_tree(&s->c, ff_vp9_mv_fp_tree,
s->prob.p.mv_comp[idx].class0_fp[n]);
s->counts.mv_comp[idx].class0_fp[n][bit]++;
n = (n << 3) | (bit << 1);
if (hp) {
bit = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].class0_hp);
s->counts.mv_comp[idx].class0_hp[bit]++;
n |= bit;
} else {
n |= 1;
// bug in libvpx - we count for bw entropy purposes even if the
// bit wasn't coded
s->counts.mv_comp[idx].class0_hp[1]++;
}
}
return sign ? -(n + 1) : (n + 1);
}
void ff_vp9_fill_mv(VP9Context *s, VP56mv *mv, int mode, int sb)
{
VP9Block *const b = &s->b;
if (mode == ZEROMV) {
memset(mv, 0, sizeof(*mv) * 2);
} else {
int hp;
// FIXME cache this value and reuse for other subblocks
find_ref_mvs(s, &mv[0], b->ref[0], 0, mode == NEARMV,
mode == NEWMV ? -1 : sb);
// FIXME maybe move this code into find_ref_mvs()
if ((mode == NEWMV || sb == -1) &&
!(hp = s->highprecisionmvs &&
abs(mv[0].x) < 64 && abs(mv[0].y) < 64)) {
if (mv[0].y & 1) {
if (mv[0].y < 0)
mv[0].y++;
else
mv[0].y--;
}
if (mv[0].x & 1) {
if (mv[0].x < 0)
mv[0].x++;
else
mv[0].x--;
}
}
if (mode == NEWMV) {
enum MVJoint j = vp8_rac_get_tree(&s->c, ff_vp9_mv_joint_tree,
s->prob.p.mv_joint);
s->counts.mv_joint[j]++;
if (j >= MV_JOINT_V)
mv[0].y += read_mv_component(s, 0, hp);
if (j & 1)
mv[0].x += read_mv_component(s, 1, hp);
}
if (b->comp) {
// FIXME cache this value and reuse for other subblocks
find_ref_mvs(s, &mv[1], b->ref[1], 1, mode == NEARMV,
mode == NEWMV ? -1 : sb);
if ((mode == NEWMV || sb == -1) &&
!(hp = s->highprecisionmvs &&
abs(mv[1].x) < 64 && abs(mv[1].y) < 64)) {
if (mv[1].y & 1) {
if (mv[1].y < 0)
mv[1].y++;
else
mv[1].y--;
}
if (mv[1].x & 1) {
if (mv[1].x < 0)
mv[1].x++;
else
mv[1].x--;
}
}
if (mode == NEWMV) {
enum MVJoint j = vp8_rac_get_tree(&s->c, ff_vp9_mv_joint_tree,
s->prob.p.mv_joint);
s->counts.mv_joint[j]++;
if (j >= MV_JOINT_V)
mv[1].y += read_mv_component(s, 0, hp);
if (j & 1)
mv[1].x += read_mv_component(s, 1, hp);
}
}
}
}
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