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aom/vp9/decoder/vp9_decodemv.c

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20 KiB
C
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/*
Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <assert.h>
#include "vp9/common/vp9_common.h"
#include "vp9/common/vp9_entropy.h"
#include "vp9/common/vp9_entropymode.h"
#include "vp9/common/vp9_entropymv.h"
#include "vp9/common/vp9_findnearmv.h"
#include "vp9/common/vp9_mvref_common.h"
#include "vp9/common/vp9_pred_common.h"
#include "vp9/common/vp9_reconinter.h"
#include "vp9/common/vp9_seg_common.h"
#include "vp9/decoder/vp9_dboolhuff.h"
#include "vp9/decoder/vp9_decodemv.h"
#include "vp9/decoder/vp9_decodeframe.h"
#include "vp9/decoder/vp9_onyxd_int.h"
static MB_PREDICTION_MODE read_intra_mode(vp9_reader *r, const vp9_prob *p) {
return (MB_PREDICTION_MODE)vp9_read_tree(r, vp9_intra_mode_tree, p);
}
static MB_PREDICTION_MODE read_intra_mode_y(VP9_COMMON *cm, vp9_reader *r,
int size_group) {
const MB_PREDICTION_MODE y_mode = read_intra_mode(r,
cm->fc.y_mode_prob[size_group]);
if (!cm->frame_parallel_decoding_mode)
++cm->counts.y_mode[size_group][y_mode];
return y_mode;
}
static MB_PREDICTION_MODE read_intra_mode_uv(VP9_COMMON *cm, vp9_reader *r,
MB_PREDICTION_MODE y_mode) {
const MB_PREDICTION_MODE uv_mode = read_intra_mode(r,
cm->fc.uv_mode_prob[y_mode]);
if (!cm->frame_parallel_decoding_mode)
++cm->counts.uv_mode[y_mode][uv_mode];
return uv_mode;
}
static MB_PREDICTION_MODE read_inter_mode(VP9_COMMON *cm, vp9_reader *r,
int ctx) {
const int mode = vp9_read_tree(r, vp9_inter_mode_tree,
cm->fc.inter_mode_probs[ctx]);
if (!cm->frame_parallel_decoding_mode)
++cm->counts.inter_mode[ctx][mode];
return NEARESTMV + mode;
}
static int read_segment_id(vp9_reader *r, const struct segmentation *seg) {
return vp9_read_tree(r, vp9_segment_tree, seg->tree_probs);
}
static TX_SIZE read_selected_tx_size(VP9_COMMON *cm, MACROBLOCKD *xd,
TX_SIZE max_tx_size, vp9_reader *r) {
const int ctx = vp9_get_pred_context_tx_size(xd);
const vp9_prob *tx_probs = get_tx_probs(max_tx_size, ctx, &cm->fc.tx_probs);
TX_SIZE tx_size = vp9_read(r, tx_probs[0]);
if (tx_size != TX_4X4 && max_tx_size >= TX_16X16) {
tx_size += vp9_read(r, tx_probs[1]);
if (tx_size != TX_8X8 && max_tx_size >= TX_32X32)
tx_size += vp9_read(r, tx_probs[2]);
}
if (!cm->frame_parallel_decoding_mode)
++get_tx_counts(max_tx_size, ctx, &cm->counts.tx)[tx_size];
return tx_size;
}
static TX_SIZE read_tx_size(VP9_COMMON *cm, MACROBLOCKD *xd, TX_MODE tx_mode,
BLOCK_SIZE bsize, int allow_select, vp9_reader *r) {
const TX_SIZE max_tx_size = max_txsize_lookup[bsize];
if (allow_select && tx_mode == TX_MODE_SELECT && bsize >= BLOCK_8X8)
return read_selected_tx_size(cm, xd, max_tx_size, r);
else
return MIN(max_tx_size, tx_mode_to_biggest_tx_size[tx_mode]);
}
static void set_segment_id(VP9_COMMON *cm, BLOCK_SIZE bsize,
int mi_row, int mi_col, int segment_id) {
const int mi_offset = mi_row * cm->mi_cols + mi_col;
const int bw = num_8x8_blocks_wide_lookup[bsize];
const int bh = num_8x8_blocks_high_lookup[bsize];
const int xmis = MIN(cm->mi_cols - mi_col, bw);
const int ymis = MIN(cm->mi_rows - mi_row, bh);
int x, y;
assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);
for (y = 0; y < ymis; y++)
for (x = 0; x < xmis; x++)
cm->last_frame_seg_map[mi_offset + y * cm->mi_cols + x] = segment_id;
}
static int read_intra_segment_id(VP9_COMMON *const cm, MACROBLOCKD *const xd,
int mi_row, int mi_col,
vp9_reader *r) {
struct segmentation *const seg = &cm->seg;
const BLOCK_SIZE bsize = xd->mi_8x8[0]->mbmi.sb_type;
int segment_id;
if (!seg->enabled)
return 0; // Default for disabled segmentation
if (!seg->update_map)
return 0;
segment_id = read_segment_id(r, seg);
set_segment_id(cm, bsize, mi_row, mi_col, segment_id);
return segment_id;
}
static int read_inter_segment_id(VP9_COMMON *const cm, MACROBLOCKD *const xd,
int mi_row, int mi_col, vp9_reader *r) {
struct segmentation *const seg = &cm->seg;
MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
const BLOCK_SIZE bsize = mbmi->sb_type;
int predicted_segment_id, segment_id;
if (!seg->enabled)
return 0; // Default for disabled segmentation
predicted_segment_id = vp9_get_segment_id(cm, cm->last_frame_seg_map,
bsize, mi_row, mi_col);
if (!seg->update_map)
return predicted_segment_id;
if (seg->temporal_update) {
const vp9_prob pred_prob = vp9_get_pred_prob_seg_id(seg, xd);
mbmi->seg_id_predicted = vp9_read(r, pred_prob);
segment_id = mbmi->seg_id_predicted ? predicted_segment_id
: read_segment_id(r, seg);
} else {
segment_id = read_segment_id(r, seg);
}
set_segment_id(cm, bsize, mi_row, mi_col, segment_id);
return segment_id;
}
static int read_skip_coeff(VP9_COMMON *cm, const MACROBLOCKD *xd,
int segment_id, vp9_reader *r) {
if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)) {
return 1;
} else {
const int ctx = vp9_get_pred_context_mbskip(xd);
const int skip = vp9_read(r, cm->fc.mbskip_probs[ctx]);
if (!cm->frame_parallel_decoding_mode)
++cm->counts.mbskip[ctx][skip];
return skip;
}
}
static void read_intra_frame_mode_info(VP9_COMMON *const cm,
MACROBLOCKD *const xd,
MODE_INFO *const m,
int mi_row, int mi_col, vp9_reader *r) {
MB_MODE_INFO *const mbmi = &m->mbmi;
const BLOCK_SIZE bsize = mbmi->sb_type;
const MODE_INFO *above_mi = xd->mi_8x8[-cm->mode_info_stride];
const MODE_INFO *left_mi = xd->left_available ? xd->mi_8x8[-1] : NULL;
mbmi->segment_id = read_intra_segment_id(cm, xd, mi_row, mi_col, r);
mbmi->skip_coeff = read_skip_coeff(cm, xd, mbmi->segment_id, r);
mbmi->tx_size = read_tx_size(cm, xd, cm->tx_mode, bsize, 1, r);
mbmi->ref_frame[0] = INTRA_FRAME;
mbmi->ref_frame[1] = NONE;
if (bsize >= BLOCK_8X8) {
const MB_PREDICTION_MODE A = above_block_mode(m, above_mi, 0);
const MB_PREDICTION_MODE L = left_block_mode(m, left_mi, 0);
mbmi->mode = read_intra_mode(r, vp9_kf_y_mode_prob[A][L]);
} else {
// Only 4x4, 4x8, 8x4 blocks
const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize]; // 1 or 2
const int num_4x4_h = num_4x4_blocks_high_lookup[bsize]; // 1 or 2
int idx, idy;
for (idy = 0; idy < 2; idy += num_4x4_h) {
for (idx = 0; idx < 2; idx += num_4x4_w) {
const int ib = idy * 2 + idx;
const MB_PREDICTION_MODE A = above_block_mode(m, above_mi, ib);
const MB_PREDICTION_MODE L = left_block_mode(m, left_mi, ib);
const MB_PREDICTION_MODE b_mode = read_intra_mode(r,
vp9_kf_y_mode_prob[A][L]);
m->bmi[ib].as_mode = b_mode;
if (num_4x4_h == 2)
m->bmi[ib + 2].as_mode = b_mode;
if (num_4x4_w == 2)
m->bmi[ib + 1].as_mode = b_mode;
}
}
mbmi->mode = m->bmi[3].as_mode;
}
mbmi->uv_mode = read_intra_mode(r, vp9_kf_uv_mode_prob[mbmi->mode]);
}
static int read_mv_component(vp9_reader *r,
const nmv_component *mvcomp, int usehp) {
int mag, d, fr, hp;
const int sign = vp9_read(r, mvcomp->sign);
const int mv_class = vp9_read_tree(r, vp9_mv_class_tree, mvcomp->classes);
const int class0 = mv_class == MV_CLASS_0;
// Integer part
if (class0) {
d = vp9_read_tree(r, vp9_mv_class0_tree, mvcomp->class0);
} else {
int i;
const int n = mv_class + CLASS0_BITS - 1; // number of bits
d = 0;
for (i = 0; i < n; ++i)
d |= vp9_read(r, mvcomp->bits[i]) << i;
}
// Fractional part
fr = vp9_read_tree(r, vp9_mv_fp_tree, class0 ? mvcomp->class0_fp[d]
: mvcomp->fp);
// High precision part (if hp is not used, the default value of the hp is 1)
hp = usehp ? vp9_read(r, class0 ? mvcomp->class0_hp : mvcomp->hp)
: 1;
// Result
mag = vp9_get_mv_mag(mv_class, (d << 3) | (fr << 1) | hp) + 1;
return sign ? -mag : mag;
}
static INLINE void read_mv(vp9_reader *r, MV *mv, const MV *ref,
const nmv_context *ctx,
nmv_context_counts *counts, int allow_hp) {
const MV_JOINT_TYPE j = vp9_read_tree(r, vp9_mv_joint_tree, ctx->joints);
const int use_hp = allow_hp && vp9_use_mv_hp(ref);
MV diff = {0, 0};
if (mv_joint_vertical(j))
diff.row = read_mv_component(r, &ctx->comps[0], use_hp);
if (mv_joint_horizontal(j))
diff.col = read_mv_component(r, &ctx->comps[1], use_hp);
vp9_inc_mv(&diff, counts);
mv->row = ref->row + diff.row;
mv->col = ref->col + diff.col;
}
static REFERENCE_MODE read_reference_mode(VP9_COMMON *cm,
const MACROBLOCKD *xd,
vp9_reader *r) {
const int ctx = vp9_get_pred_context_comp_inter_inter(cm, xd);
const int mode = vp9_read(r, cm->fc.comp_inter_prob[ctx]);
if (!cm->frame_parallel_decoding_mode)
++cm->counts.comp_inter[ctx][mode];
return mode; // SINGLE_REFERENCE or COMPOUND_REFERENCE
}
// Read the referncence frame
static void read_ref_frames(VP9_COMMON *const cm, MACROBLOCKD *const xd,
vp9_reader *r,
int segment_id, MV_REFERENCE_FRAME ref_frame[2]) {
FRAME_CONTEXT *const fc = &cm->fc;
FRAME_COUNTS *const counts = &cm->counts;
if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
ref_frame[0] = vp9_get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME);
ref_frame[1] = NONE;
} else {
const REFERENCE_MODE mode = (cm->comp_pred_mode == REFERENCE_MODE_SELECT)
? read_reference_mode(cm, xd, r)
: cm->comp_pred_mode;
// FIXME(rbultje) I'm pretty sure this breaks segmentation ref frame coding
if (mode == COMPOUND_REFERENCE) {
const int idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
const int ctx = vp9_get_pred_context_comp_ref_p(cm, xd);
const int bit = vp9_read(r, fc->comp_ref_prob[ctx]);
if (!cm->frame_parallel_decoding_mode)
++counts->comp_ref[ctx][bit];
ref_frame[idx] = cm->comp_fixed_ref;
ref_frame[!idx] = cm->comp_var_ref[bit];
} else if (mode == SINGLE_REFERENCE) {
const int ctx0 = vp9_get_pred_context_single_ref_p1(xd);
const int bit0 = vp9_read(r, fc->single_ref_prob[ctx0][0]);
if (!cm->frame_parallel_decoding_mode)
++counts->single_ref[ctx0][0][bit0];
if (bit0) {
const int ctx1 = vp9_get_pred_context_single_ref_p2(xd);
const int bit1 = vp9_read(r, fc->single_ref_prob[ctx1][1]);
if (!cm->frame_parallel_decoding_mode)
++counts->single_ref[ctx1][1][bit1];
ref_frame[0] = bit1 ? ALTREF_FRAME : GOLDEN_FRAME;
} else {
ref_frame[0] = LAST_FRAME;
}
ref_frame[1] = NONE;
} else {
assert(!"Invalid prediction mode.");
}
}
}
static INLINE INTERPOLATION_TYPE read_switchable_filter_type(
VP9_COMMON *const cm, MACROBLOCKD *const xd, vp9_reader *r) {
const int ctx = vp9_get_pred_context_switchable_interp(xd);
const int type = vp9_read_tree(r, vp9_switchable_interp_tree,
cm->fc.switchable_interp_prob[ctx]);
if (!cm->frame_parallel_decoding_mode)
++cm->counts.switchable_interp[ctx][type];
return type;
}
static void read_intra_block_mode_info(VP9_COMMON *const cm, MODE_INFO *mi,
vp9_reader *r) {
MB_MODE_INFO *const mbmi = &mi->mbmi;
const BLOCK_SIZE bsize = mi->mbmi.sb_type;
mbmi->ref_frame[0] = INTRA_FRAME;
mbmi->ref_frame[1] = NONE;
if (bsize >= BLOCK_8X8) {
mbmi->mode = read_intra_mode_y(cm, r, size_group_lookup[bsize]);
} else {
// Only 4x4, 4x8, 8x4 blocks
const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize]; // 1 or 2
const int num_4x4_h = num_4x4_blocks_high_lookup[bsize]; // 1 or 2
int idx, idy;
for (idy = 0; idy < 2; idy += num_4x4_h) {
for (idx = 0; idx < 2; idx += num_4x4_w) {
const int ib = idy * 2 + idx;
const int b_mode = read_intra_mode_y(cm, r, 0);
mi->bmi[ib].as_mode = b_mode;
if (num_4x4_h == 2)
mi->bmi[ib + 2].as_mode = b_mode;
if (num_4x4_w == 2)
mi->bmi[ib + 1].as_mode = b_mode;
}
}
mbmi->mode = mi->bmi[3].as_mode;
}
mbmi->uv_mode = read_intra_mode_uv(cm, r, mbmi->mode);
}
static INLINE int assign_mv(VP9_COMMON *cm, MB_PREDICTION_MODE mode,
int_mv mv[2], int_mv best_mv[2],
int_mv nearest_mv[2], int_mv near_mv[2],
int is_compound, int allow_hp, vp9_reader *r) {
int i;
int ret = 1;
switch (mode) {
case NEWMV: {
nmv_context_counts *const mv_counts = cm->frame_parallel_decoding_mode ?
NULL : &cm->counts.mv;
read_mv(r, &mv[0].as_mv, &best_mv[0].as_mv,
&cm->fc.nmvc, mv_counts, allow_hp);
if (is_compound)
read_mv(r, &mv[1].as_mv, &best_mv[1].as_mv,
&cm->fc.nmvc, mv_counts, allow_hp);
for (i = 0; i < 1 + is_compound; ++i) {
ret = ret && mv[i].as_mv.row < MV_UPP && mv[i].as_mv.row > MV_LOW;
ret = ret && mv[i].as_mv.col < MV_UPP && mv[i].as_mv.col > MV_LOW;
}
break;
}
case NEARESTMV: {
mv[0].as_int = nearest_mv[0].as_int;
if (is_compound) mv[1].as_int = nearest_mv[1].as_int;
break;
}
case NEARMV: {
mv[0].as_int = near_mv[0].as_int;
if (is_compound) mv[1].as_int = near_mv[1].as_int;
break;
}
case ZEROMV: {
mv[0].as_int = 0;
if (is_compound) mv[1].as_int = 0;
break;
}
default: {
return 0;
}
}
return ret;
}
static int read_is_inter_block(VP9_COMMON *const cm, MACROBLOCKD *const xd,
int segment_id, vp9_reader *r) {
if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
return vp9_get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME) !=
INTRA_FRAME;
} else {
const int ctx = vp9_get_pred_context_intra_inter(xd);
const int is_inter = vp9_read(r, vp9_get_pred_prob_intra_inter(cm, xd));
if (!cm->frame_parallel_decoding_mode)
++cm->counts.intra_inter[ctx][is_inter];
return is_inter;
}
}
static void read_inter_block_mode_info(VP9_COMMON *const cm,
MACROBLOCKD *const xd,
const TileInfo *const tile,
MODE_INFO *const mi,
int mi_row, int mi_col, vp9_reader *r) {
MB_MODE_INFO *const mbmi = &mi->mbmi;
const BLOCK_SIZE bsize = mbmi->sb_type;
const int allow_hp = cm->allow_high_precision_mv;
int_mv nearest[2], nearmv[2], best[2];
uint8_t inter_mode_ctx;
MV_REFERENCE_FRAME ref0;
int is_compound;
mbmi->uv_mode = DC_PRED;
read_ref_frames(cm, xd, r, mbmi->segment_id, mbmi->ref_frame);
ref0 = mbmi->ref_frame[0];
is_compound = has_second_ref(mbmi);
vp9_find_mv_refs(cm, xd, tile, mi, xd->last_mi, ref0, mbmi->ref_mvs[ref0],
mi_row, mi_col);
inter_mode_ctx = mbmi->mode_context[ref0];
if (vp9_segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
mbmi->mode = ZEROMV;
if (bsize < BLOCK_8X8) {
vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
"Invalid usage of segement feature on small blocks");
return;
}
} else {
if (bsize >= BLOCK_8X8)
mbmi->mode = read_inter_mode(cm, r, inter_mode_ctx);
}
// nearest, nearby
if (bsize < BLOCK_8X8 || mbmi->mode != ZEROMV) {
vp9_find_best_ref_mvs(xd, allow_hp,
mbmi->ref_mvs[ref0], &nearest[0], &nearmv[0]);
best[0].as_int = nearest[0].as_int;
}
if (is_compound) {
const MV_REFERENCE_FRAME ref1 = mbmi->ref_frame[1];
vp9_find_mv_refs(cm, xd, tile, mi, xd->last_mi,
ref1, mbmi->ref_mvs[ref1], mi_row, mi_col);
if (bsize < BLOCK_8X8 || mbmi->mode != ZEROMV) {
vp9_find_best_ref_mvs(xd, allow_hp,
mbmi->ref_mvs[ref1], &nearest[1], &nearmv[1]);
best[1].as_int = nearest[1].as_int;
}
}
mbmi->interp_filter = (cm->mcomp_filter_type == SWITCHABLE)
? read_switchable_filter_type(cm, xd, r)
: cm->mcomp_filter_type;
if (bsize < BLOCK_8X8) {
const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize]; // 1 or 2
const int num_4x4_h = num_4x4_blocks_high_lookup[bsize]; // 1 or 2
int idx, idy;
int b_mode;
for (idy = 0; idy < 2; idy += num_4x4_h) {
for (idx = 0; idx < 2; idx += num_4x4_w) {
int_mv block[2];
const int j = idy * 2 + idx;
b_mode = read_inter_mode(cm, r, inter_mode_ctx);
if (b_mode == NEARESTMV || b_mode == NEARMV) {
vp9_append_sub8x8_mvs_for_idx(cm, xd, tile, &nearest[0],
&nearmv[0], j, 0,
mi_row, mi_col);
if (is_compound)
vp9_append_sub8x8_mvs_for_idx(cm, xd, tile, &nearest[1],
&nearmv[1], j, 1,
mi_row, mi_col);
}
if (!assign_mv(cm, b_mode, block, best, nearest, nearmv,
is_compound, allow_hp, r)) {
xd->corrupted |= 1;
break;
};
mi->bmi[j].as_mv[0].as_int = block[0].as_int;
if (is_compound)
mi->bmi[j].as_mv[1].as_int = block[1].as_int;
if (num_4x4_h == 2)
mi->bmi[j + 2] = mi->bmi[j];
if (num_4x4_w == 2)
mi->bmi[j + 1] = mi->bmi[j];
}
}
mi->mbmi.mode = b_mode;
mbmi->mv[0].as_int = mi->bmi[3].as_mv[0].as_int;
mbmi->mv[1].as_int = mi->bmi[3].as_mv[1].as_int;
} else {
xd->corrupted |= !assign_mv(cm, mbmi->mode, mbmi->mv,
best, nearest, nearmv,
is_compound, allow_hp, r);
}
}
static void read_inter_frame_mode_info(VP9_COMMON *const cm,
MACROBLOCKD *const xd,
const TileInfo *const tile,
MODE_INFO *const mi,
int mi_row, int mi_col, vp9_reader *r) {
MB_MODE_INFO *const mbmi = &mi->mbmi;
int inter_block;
mbmi->mv[0].as_int = 0;
mbmi->mv[1].as_int = 0;
mbmi->segment_id = read_inter_segment_id(cm, xd, mi_row, mi_col, r);
mbmi->skip_coeff = read_skip_coeff(cm, xd, mbmi->segment_id, r);
inter_block = read_is_inter_block(cm, xd, mbmi->segment_id, r);
mbmi->tx_size = read_tx_size(cm, xd, cm->tx_mode, mbmi->sb_type,
!mbmi->skip_coeff || !inter_block, r);
if (inter_block)
read_inter_block_mode_info(cm, xd, tile, mi, mi_row, mi_col, r);
else
read_intra_block_mode_info(cm, mi, r);
}
void vp9_read_mode_info(VP9_COMMON *cm, MACROBLOCKD *xd,
const TileInfo *const tile,
int mi_row, int mi_col, vp9_reader *r) {
MODE_INFO *const mi = xd->mi_8x8[0];
const BLOCK_SIZE bsize = mi->mbmi.sb_type;
const int bw = num_8x8_blocks_wide_lookup[bsize];
const int bh = num_8x8_blocks_high_lookup[bsize];
const int y_mis = MIN(bh, cm->mi_rows - mi_row);
const int x_mis = MIN(bw, cm->mi_cols - mi_col);
int x, y, z;
if (frame_is_intra_only(cm))
read_intra_frame_mode_info(cm, xd, mi, mi_row, mi_col, r);
else
read_inter_frame_mode_info(cm, xd, tile, mi, mi_row, mi_col, r);
for (y = 0, z = 0; y < y_mis; y++, z += cm->mode_info_stride) {
for (x = !y; x < x_mis; x++) {
xd->mi_8x8[z + x] = mi;
}
}
}
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