generic-library/vpx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
9c9d6743d4
vpx/vp8/decoder/decodemv.c
Deb Mukherjee 1fe85a35e0 Adaptive entropy coding of coefficients, modes, mv. 
This patch incorporates adaptive entropy coding of coefficient tokens,
and mode/mv information based on distributions encountered in a frame.
Specifically, there is an initial forward update to the probabilities
in the bitstream as before for coding the symbols in the frame, however
at the end of decoding each frame, the forward update to the
probabilities is reverted and instead the probabilities are updated
towards the actual distributions encountered within the frame.
The amount of update is weighted by the number of hits within each
context.

Results on derf/hd/std-hd are all up by 1.6%.

On derf, the most of the gains come from coefficients, however for the
hd and std-hd sets, the most of the gains come from the mode/mv
information updates.

Change-Id: I708c0e11fdacafee04940fe7ae159ba6844005fd
2012-06-15 10:35:23 -07:00

1145 lines
38 KiB
C
Raw Blame History

/*
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 "treereader.h"
#include "vp8/common/entropymv.h"
#include "vp8/common/entropymode.h"
#include "onyxd_int.h"
#include "vp8/common/findnearmv.h"
#include "vp8/common/seg_common.h"
#include "vp8/common/pred_common.h"
#include "vp8/common/entropy.h"
#if CONFIG_DEBUG
#include <assert.h>
#endif
//#define DEBUG_DEC_MV
#ifdef DEBUG_DEC_MV
int dec_mvcount = 0;
#endif
static int vp8_read_bmode(vp8_reader *bc, const vp8_prob *p)
{
const int i = vp8_treed_read(bc, vp8_bmode_tree, p);
return i;
}
static int vp8_read_ymode(vp8_reader *bc, const vp8_prob *p)
{
const int i = vp8_treed_read(bc, vp8_ymode_tree, p);
return i;
}
static int vp8_kfread_ymode(vp8_reader *bc, const vp8_prob *p)
{
const int i = vp8_treed_read(bc, vp8_kf_ymode_tree, p);
return i;
}
static int vp8_read_i8x8_mode(vp8_reader *bc, const vp8_prob *p)
{
const int i = vp8_treed_read(bc, vp8_i8x8_mode_tree, p);
return i;
}
static int vp8_read_uv_mode(vp8_reader *bc, const vp8_prob *p)
{
const int i = vp8_treed_read(bc, vp8_uv_mode_tree, p);
return i;
}
// This function reads the current macro block's segnent id from the bitstream
// It should only be called if a segment map update is indicated.
static void vp8_read_mb_segid(vp8_reader *r, MB_MODE_INFO *mi, MACROBLOCKD *x)
{
/* Is segmentation enabled */
if (x->segmentation_enabled && x->update_mb_segmentation_map)
{
/* If so then read the segment id. */
if (vp8_read(r, x->mb_segment_tree_probs[0]))
mi->segment_id = (unsigned char)(2 + vp8_read(r, x->mb_segment_tree_probs[2]));
else
mi->segment_id = (unsigned char)(vp8_read(r, x->mb_segment_tree_probs[1]));
}
}
extern const int vp8_i8x8_block[4];
static void vp8_kfread_modes(VP8D_COMP *pbi,
MODE_INFO *m,
int mb_row,
int mb_col)
{
VP8_COMMON *const cm = & pbi->common;
vp8_reader *const bc = & pbi->bc;
const int mis = pbi->common.mode_info_stride;
int map_index = mb_row * pbi->common.mb_cols + mb_col;
MB_PREDICTION_MODE y_mode;
// Read the Macroblock segmentation map if it is being updated explicitly
// this frame (reset to 0 by default).
m->mbmi.segment_id = 0;
if (pbi->mb.update_mb_segmentation_map)
{
vp8_read_mb_segid(bc, &m->mbmi, &pbi->mb);
pbi->common.last_frame_seg_map[map_index] = m->mbmi.segment_id;
}
m->mbmi.mb_skip_coeff = 0;
if ( pbi->common.mb_no_coeff_skip &&
( !segfeature_active( &pbi->mb,
m->mbmi.segment_id, SEG_LVL_EOB ) ||
( get_segdata( &pbi->mb,
m->mbmi.segment_id, SEG_LVL_EOB ) != 0 ) ) )
{
#if CONFIG_NEWENTROPY
MACROBLOCKD *const xd = & pbi->mb;
m->mbmi.mb_skip_coeff = vp8_read(bc, get_pred_prob(cm, xd, PRED_MBSKIP));
#else
m->mbmi.mb_skip_coeff = vp8_read(bc, pbi->prob_skip_false);
#endif
}
else
{
if ( segfeature_active( &pbi->mb,
m->mbmi.segment_id, SEG_LVL_EOB ) &&
( get_segdata( &pbi->mb,
m->mbmi.segment_id, SEG_LVL_EOB ) == 0 ) )
{
m->mbmi.mb_skip_coeff = 1;
}
else
m->mbmi.mb_skip_coeff = 0;
}
y_mode = (MB_PREDICTION_MODE) vp8_kfread_ymode(bc,
pbi->common.kf_ymode_prob[pbi->common.kf_ymode_probs_index]);
#if CONFIG_COMP_INTRA_PRED
m->mbmi.second_mode = (MB_PREDICTION_MODE) (DC_PRED - 1);
#endif
m->mbmi.ref_frame = INTRA_FRAME;
if ((m->mbmi.mode = y_mode) == B_PRED)
{
int i = 0;
#if CONFIG_COMP_INTRA_PRED
int use_comp_pred = vp8_read(bc, 128);
#endif
do
{
const B_PREDICTION_MODE A = above_block_mode(m, i, mis);
const B_PREDICTION_MODE L = left_block_mode(m, i);
m->bmi[i].as_mode.first =
(B_PREDICTION_MODE) vp8_read_bmode(
bc, pbi->common.kf_bmode_prob [A] [L]);
#if CONFIG_COMP_INTRA_PRED
if (use_comp_pred)
{
m->bmi[i].as_mode.second =
(B_PREDICTION_MODE) vp8_read_bmode(
bc, pbi->common.kf_bmode_prob [A] [L]);
}
else
{
m->bmi[i].as_mode.second = (B_PREDICTION_MODE) (B_DC_PRED - 1);
}
#endif
}
while (++i < 16);
}
if((m->mbmi.mode = y_mode) == I8X8_PRED)
{
int i;
int mode8x8;
for(i=0;i<4;i++)
{
int ib = vp8_i8x8_block[i];
mode8x8 = vp8_read_i8x8_mode(bc, pbi->common.fc.i8x8_mode_prob);
m->bmi[ib+0].as_mode.first= mode8x8;
m->bmi[ib+1].as_mode.first= mode8x8;
m->bmi[ib+4].as_mode.first= mode8x8;
m->bmi[ib+5].as_mode.first= mode8x8;
#if CONFIG_COMP_INTRA_PRED
m->bmi[ib+0].as_mode.second= (MB_PREDICTION_MODE) (DC_PRED - 1);
m->bmi[ib+1].as_mode.second= (MB_PREDICTION_MODE) (DC_PRED - 1);
m->bmi[ib+4].as_mode.second= (MB_PREDICTION_MODE) (DC_PRED - 1);
m->bmi[ib+5].as_mode.second= (MB_PREDICTION_MODE) (DC_PRED - 1);
#endif
}
}
else
m->mbmi.uv_mode = (MB_PREDICTION_MODE)vp8_read_uv_mode(bc,
pbi->common.kf_uv_mode_prob[m->mbmi.mode]);
#if CONFIG_COMP_INTRA_PRED
m->mbmi.second_uv_mode = (MB_PREDICTION_MODE) (DC_PRED - 1);
#endif
}
static int read_mvcomponent(vp8_reader *r, const MV_CONTEXT *mvc)
{
const vp8_prob *const p = (const vp8_prob *) mvc;
int x = 0;
if (vp8_read(r, p [mvpis_short])) /* Large */
{
int i = 0;
do
{
x += vp8_read(r, p [MVPbits + i]) << i;
}
while (++i < mvnum_short_bits);
i = mvlong_width - 1; /* Skip bit 3, which is sometimes implicit */
do
{
x += vp8_read(r, p [MVPbits + i]) << i;
}
while (--i > mvnum_short_bits);
if (!(x & ~((2<<mvnum_short_bits)-1)) || vp8_read(r, p [MVPbits + mvnum_short_bits]))
x += (mvnum_short);
}
else /* small */
x = vp8_treed_read(r, vp8_small_mvtree, p + MVPshort);
if (x && vp8_read(r, p [MVPsign]))
x = -x;
return x;
}
static void read_mv(vp8_reader *r, MV *mv, const MV_CONTEXT *mvc)
{
mv->row = (short)(read_mvcomponent(r, mvc) << 1);
mv->col = (short)(read_mvcomponent(r, ++mvc) << 1);
#ifdef DEBUG_DEC_MV
int i;
printf("%d (np): %d %d\n", dec_mvcount++, mv->row, mv->col);
//for (i=0; i<MVPcount;++i) printf(" %d", (&mvc[-1])->prob[i]); printf("\n");
//for (i=0; i<MVPcount;++i) printf(" %d", (&mvc[0])->prob[i]); printf("\n");
#endif
}
static void read_mvcontexts(vp8_reader *bc, MV_CONTEXT *mvc)
{
int i = 0;
do
{
const vp8_prob *up = vp8_mv_update_probs[i].prob;
vp8_prob *p = (vp8_prob *)(mvc + i);
vp8_prob *const pstop = p + MVPcount;
do
{
if (vp8_read(bc, *up++))
{
const vp8_prob x = (vp8_prob)vp8_read_literal(bc, 7);
*p = x ? x << 1 : 1;
}
}
while (++p < pstop);
}
while (++i < 2);
}
#if CONFIG_HIGH_PRECISION_MV
static int read_mvcomponent_hp(vp8_reader *r, const MV_CONTEXT_HP *mvc)
{
const vp8_prob *const p = (const vp8_prob *) mvc;
int x = 0;
if (vp8_read(r, p [mvpis_short_hp])) /* Large */
{
int i = 0;
do
{
x += vp8_read(r, p [MVPbits_hp + i]) << i;
}
while (++i < mvnum_short_bits_hp);
i = mvlong_width_hp - 1; /* Skip bit 3, which is sometimes implicit */
do
{
x += vp8_read(r, p [MVPbits_hp + i]) << i;
}
while (--i > mvnum_short_bits_hp);
if (!(x & ~((2<<mvnum_short_bits_hp)-1)) || vp8_read(r, p [MVPbits_hp + mvnum_short_bits_hp]))
x += (mvnum_short_hp);
}
else /* small */
x = vp8_treed_read(r, vp8_small_mvtree_hp, p + MVPshort_hp);
if (x && vp8_read(r, p [MVPsign_hp]))
x = -x;
return x;
}
static void read_mv_hp(vp8_reader *r, MV *mv, const MV_CONTEXT_HP *mvc)
{
mv->row = (short)(read_mvcomponent_hp(r, mvc));
mv->col = (short)(read_mvcomponent_hp(r, ++mvc));
#ifdef DEBUG_DEC_MV
int i;
printf("%d (hp): %d %d\n", dec_mvcount++, mv->row, mv->col);
//for (i=0; i<MVPcount_hp;++i) printf(" %d", (&mvc[-1])->prob[i]); printf("\n");
//for (i=0; i<MVPcount_hp;++i) printf(" %d", (&mvc[0])->prob[i]); printf("\n");
#endif
}
static void read_mvcontexts_hp(vp8_reader *bc, MV_CONTEXT_HP *mvc)
{
int i = 0;
do
{
const vp8_prob *up = vp8_mv_update_probs_hp[i].prob;
vp8_prob *p = (vp8_prob *)(mvc + i);
vp8_prob *const pstop = p + MVPcount_hp;
do
{
if (vp8_read(bc, *up++))
{
const vp8_prob x = (vp8_prob)vp8_read_literal(bc, 7);
*p = x ? x << 1 : 1;
}
}
while (++p < pstop);
}
while (++i < 2);
}
#endif /* CONFIG_HIGH_PRECISION_MV */
// Read the referncence frame
static MV_REFERENCE_FRAME read_ref_frame( VP8D_COMP *pbi,
vp8_reader *const bc,
unsigned char segment_id )
{
MV_REFERENCE_FRAME ref_frame;
int seg_ref_active;
int seg_ref_count = 0;
VP8_COMMON *const cm = & pbi->common;
MACROBLOCKD *const xd = &pbi->mb;
seg_ref_active = segfeature_active( xd,
segment_id,
SEG_LVL_REF_FRAME );
// If segment coding enabled does the segment allow for more than one
// possible reference frame
if ( seg_ref_active )
{
seg_ref_count = check_segref( xd, segment_id, INTRA_FRAME ) +
check_segref( xd, segment_id, LAST_FRAME ) +
check_segref( xd, segment_id, GOLDEN_FRAME ) +
check_segref( xd, segment_id, ALTREF_FRAME );
}
// Segment reference frame features not available or allows for
// multiple reference frame options
if ( !seg_ref_active || (seg_ref_count > 1) )
{
// Values used in prediction model coding
unsigned char prediction_flag;
vp8_prob pred_prob;
MV_REFERENCE_FRAME pred_ref;
// Get the context probability the prediction flag
pred_prob = get_pred_prob( cm, xd, PRED_REF );
// Read the prediction status flag
prediction_flag = (unsigned char)vp8_read( bc, pred_prob );
// Store the prediction flag.
set_pred_flag( xd, PRED_REF, prediction_flag );
// Get the predicted reference frame.
pred_ref = get_pred_ref( cm, xd );
// If correctly predicted then use the predicted value
if ( prediction_flag )
{
ref_frame = pred_ref;
}
// else decode the explicitly coded value
else
{
vp8_prob mod_refprobs[PREDICTION_PROBS];
vpx_memcpy( mod_refprobs,
cm->mod_refprobs[pred_ref], sizeof(mod_refprobs) );
// If segment coding enabled blank out options that cant occur by
// setting the branch probability to 0.
if ( seg_ref_active )
{
mod_refprobs[INTRA_FRAME] *=
check_segref( xd, segment_id, INTRA_FRAME );
mod_refprobs[LAST_FRAME] *=
check_segref( xd, segment_id, LAST_FRAME );
mod_refprobs[GOLDEN_FRAME] *=
( check_segref( xd, segment_id, GOLDEN_FRAME ) *
check_segref( xd, segment_id, ALTREF_FRAME ) );
}
// Default to INTRA_FRAME (value 0)
ref_frame = INTRA_FRAME;
// Do we need to decode the Intra/Inter branch
if ( mod_refprobs[0] )
ref_frame = (MV_REFERENCE_FRAME) vp8_read(bc, mod_refprobs[0]);
else
ref_frame ++;
if (ref_frame)
{
// Do we need to decode the Last/Gf_Arf branch
if ( mod_refprobs[1] )
ref_frame += vp8_read(bc, mod_refprobs[1]);
else
ref_frame++;
if ( ref_frame > 1 )
{
// Do we need to decode the GF/Arf branch
if ( mod_refprobs[2] )
ref_frame += vp8_read(bc, mod_refprobs[2]);
else
{
if ( seg_ref_active )
{
if ( (pred_ref == GOLDEN_FRAME) ||
!check_segref( xd, segment_id, GOLDEN_FRAME) )
{
ref_frame = ALTREF_FRAME;
}
else
ref_frame = GOLDEN_FRAME;
}
else
ref_frame = (pred_ref == GOLDEN_FRAME)
? ALTREF_FRAME : GOLDEN_FRAME;
}
}
}
}
}
// Segment reference frame features are enabled
else
{
// The reference frame for the mb is considered as correclty predicted
// if it is signaled at the segment level for the purposes of the
// common prediction model
set_pred_flag( xd, PRED_REF, 1 );
ref_frame = get_pred_ref( cm, xd );
}
return (MV_REFERENCE_FRAME)ref_frame;
}
static MB_PREDICTION_MODE read_mv_ref(vp8_reader *bc, const vp8_prob *p)
{
const int i = vp8_treed_read(bc, vp8_mv_ref_tree, p);
return (MB_PREDICTION_MODE)i;
}
static B_PREDICTION_MODE sub_mv_ref(vp8_reader *bc, const vp8_prob *p)
{
const int i = vp8_treed_read(bc, vp8_sub_mv_ref_tree, p);
return (B_PREDICTION_MODE)i;
}
#ifdef VPX_MODE_COUNT
unsigned int vp8_mv_cont_count[5][4] =
{
{ 0, 0, 0, 0 },
{ 0, 0, 0, 0 },
{ 0, 0, 0, 0 },
{ 0, 0, 0, 0 },
{ 0, 0, 0, 0 }
};
#endif
static const unsigned char mbsplit_fill_count[4] = {8, 8, 4, 1};
static const unsigned char mbsplit_fill_offset[4][16] = {
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
{ 0, 1, 4, 5, 8, 9, 12, 13, 2, 3, 6, 7, 10, 11, 14, 15},
{ 0, 1, 4, 5, 2, 3, 6, 7, 8, 9, 12, 13, 10, 11, 14, 15},
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
};
static void mb_mode_mv_init(VP8D_COMP *pbi)
{
VP8_COMMON *const cm = & pbi->common;
vp8_reader *const bc = & pbi->bc;
MV_CONTEXT *const mvc = pbi->common.fc.mvc;
#if CONFIG_HIGH_PRECISION_MV
MV_CONTEXT_HP *const mvc_hp = pbi->common.fc.mvc_hp;
MACROBLOCKD *const xd = & pbi->mb;
#endif
#if CONFIG_NEWENTROPY
vpx_memset(cm->mbskip_pred_probs, 0, sizeof(cm->mbskip_pred_probs));
#else
pbi->prob_skip_false = 0;
#endif
if (pbi->common.mb_no_coeff_skip)
{
#if CONFIG_NEWENTROPY
int k;
for (k=0; k<MBSKIP_CONTEXTS; ++k)
cm->mbskip_pred_probs[k] = (vp8_prob)vp8_read_literal(bc, 8);
#else
pbi->prob_skip_false = (vp8_prob)vp8_read_literal(bc, 8);
#endif
}
if(pbi->common.frame_type != KEY_FRAME)
{
// Decode the baseline probabilities for decoding reference frame
cm->prob_intra_coded = (vp8_prob)vp8_read_literal(bc, 8);
cm->prob_last_coded = (vp8_prob)vp8_read_literal(bc, 8);
cm->prob_gf_coded = (vp8_prob)vp8_read_literal(bc, 8);
// Computes a modified set of probabilities for use when reference
// frame prediction fails.
compute_mod_refprobs( cm );
pbi->common.comp_pred_mode = vp8_read(bc, 128);
if (cm->comp_pred_mode)
cm->comp_pred_mode += vp8_read(bc, 128);
if (cm->comp_pred_mode == HYBRID_PREDICTION)
{
int i;
for ( i = 0; i < COMP_PRED_CONTEXTS; i++ )
cm->prob_comppred[i] = (vp8_prob)vp8_read_literal(bc, 8);
}
if (vp8_read_bit(bc))
{
int i = 0;
do
{
cm->fc.ymode_prob[i] = (vp8_prob) vp8_read_literal(bc, 8);
}
while (++i < VP8_YMODES-1);
}
#if CONFIG_HIGH_PRECISION_MV
if (xd->allow_high_precision_mv)
read_mvcontexts_hp(bc, mvc_hp);
else
#endif
read_mvcontexts(bc, mvc);
}
}
// This function either reads the segment id for the current macroblock from
// the bitstream or if the value is temporally predicted asserts the predicted
// value
static void read_mb_segment_id ( VP8D_COMP *pbi,
int mb_row, int mb_col )
{
vp8_reader *const bc = & pbi->bc;
VP8_COMMON *const cm = & pbi->common;
MACROBLOCKD *const xd = & pbi->mb;
MODE_INFO *mi = xd->mode_info_context;
MB_MODE_INFO *mbmi = &mi->mbmi;
int index = mb_row * pbi->common.mb_cols + mb_col;
if (xd->segmentation_enabled)
{
if (xd->update_mb_segmentation_map)
{
// Is temporal coding of the segment id for this mb enabled.
if (cm->temporal_update)
{
// Get the context based probability for reading the
// prediction status flag
vp8_prob pred_prob =
get_pred_prob( cm, xd, PRED_SEG_ID );
// Read the prediction status flag
unsigned char seg_pred_flag =
(unsigned char)vp8_read(bc, pred_prob );
// Store the prediction flag.
set_pred_flag( xd, PRED_SEG_ID, seg_pred_flag );
// If the value is flagged as correctly predicted
// then use the predicted value
if ( seg_pred_flag )
{
mbmi->segment_id = get_pred_mb_segid( cm, index );
}
// Else .... decode it explicitly
else
{
vp8_read_mb_segid(bc, mbmi, xd );
cm->last_frame_seg_map[index] = mbmi->segment_id;
}
}
// Normal unpredicted coding mode
else
{
vp8_read_mb_segid(bc, mbmi, xd);
cm->last_frame_seg_map[index] = mbmi->segment_id;
}
}
}
else
{
// The encoder explicitly sets the segment_id to 0
// when segmentation is disabled
mbmi->segment_id = 0;
}
}
static void read_mb_modes_mv(VP8D_COMP *pbi, MODE_INFO *mi, MB_MODE_INFO *mbmi,
MODE_INFO *prev_mi,
int mb_row, int mb_col)
{
VP8_COMMON *const cm = & pbi->common;
vp8_reader *const bc = & pbi->bc;
MV_CONTEXT *const mvc = pbi->common.fc.mvc;
#if CONFIG_HIGH_PRECISION_MV
MV_CONTEXT_HP *const mvc_hp = pbi->common.fc.mvc_hp;
#endif
const int mis = pbi->common.mode_info_stride;
MACROBLOCKD *const xd = & pbi->mb;
int_mv *const mv = & mbmi->mv;
int mb_to_left_edge;
int mb_to_right_edge;
int mb_to_top_edge;
int mb_to_bottom_edge;
mb_to_top_edge = xd->mb_to_top_edge;
mb_to_bottom_edge = xd->mb_to_bottom_edge;
mb_to_top_edge -= LEFT_TOP_MARGIN;
mb_to_bottom_edge += RIGHT_BOTTOM_MARGIN;
mbmi->need_to_clamp_mvs = 0;
mbmi->need_to_clamp_secondmv = 0;
mbmi->second_ref_frame = 0;
/* Distance of Mb to the various image edges.
* These specified to 8th pel as they are always compared to MV values that are in 1/8th pel units
*/
xd->mb_to_left_edge =
mb_to_left_edge = -((mb_col * 16) << 3);
mb_to_left_edge -= LEFT_TOP_MARGIN;
xd->mb_to_right_edge =
mb_to_right_edge = ((pbi->common.mb_cols - 1 - mb_col) * 16) << 3;
mb_to_right_edge += RIGHT_BOTTOM_MARGIN;
// Make sure the MACROBLOCKD mode info pointer is pointed at the
// correct entry for the current macroblock.
xd->mode_info_context = mi;
// Read the macroblock segment id.
read_mb_segment_id ( pbi, mb_row, mb_col );
if ( pbi->common.mb_no_coeff_skip &&
( !segfeature_active( xd,
mbmi->segment_id, SEG_LVL_EOB ) ||
(get_segdata( xd, mbmi->segment_id, SEG_LVL_EOB ) != 0) ) )
{
// Read the macroblock coeff skip flag if this feature is in use,
// else default to 0
#if CONFIG_NEWENTROPY
mbmi->mb_skip_coeff = vp8_read(bc, get_pred_prob(cm, xd, PRED_MBSKIP));
#else
mbmi->mb_skip_coeff = vp8_read(bc, pbi->prob_skip_false);
#endif
}
else
{
if ( segfeature_active( xd,
mbmi->segment_id, SEG_LVL_EOB ) &&
(get_segdata( xd, mbmi->segment_id, SEG_LVL_EOB ) == 0) )
{
mbmi->mb_skip_coeff = 1;
}
else
mbmi->mb_skip_coeff = 0;
}
// Read the reference frame
mbmi->ref_frame = read_ref_frame( pbi, bc, mbmi->segment_id );
// If reference frame is an Inter frame
if (mbmi->ref_frame)
{
int rct[4];
int_mv nearest, nearby, best_mv;
int_mv nearest_second, nearby_second, best_mv_second;
vp8_prob mv_ref_p [VP8_MVREFS-1];
vp8_find_near_mvs(xd, mi,
prev_mi,
&nearest, &nearby, &best_mv, rct,
mbmi->ref_frame, pbi->common.ref_frame_sign_bias);
vp8_mv_ref_probs(&pbi->common, mv_ref_p, rct);
// Is the segment level mode feature enabled for this segment
if ( segfeature_active( xd, mbmi->segment_id, SEG_LVL_MODE ) )
{
mbmi->mode =
get_segdata( xd, mbmi->segment_id, SEG_LVL_MODE );
}
else
{
mbmi->mode = read_mv_ref(bc, mv_ref_p);
vp8_accum_mv_refs(&pbi->common, mbmi->mode, rct);
}
if ( cm->comp_pred_mode == COMP_PREDICTION_ONLY ||
(cm->comp_pred_mode == HYBRID_PREDICTION &&
vp8_read(bc, get_pred_prob( cm, xd, PRED_COMP ))) )
{
/* Since we have 3 reference frames, we can only have 3 unique
* combinations of combinations of 2 different reference frames
* (A-G, G-L or A-L). In the bitstream, we use this to simply
* derive the second reference frame from the first reference
* frame, by saying it's the next one in the enumerator, and
* if that's > n_refs, then the second reference frame is the
* first one in the enumerator. */
mbmi->second_ref_frame = mbmi->ref_frame + 1;
if (mbmi->second_ref_frame == 4)
mbmi->second_ref_frame = 1;
vp8_find_near_mvs(xd, mi,
prev_mi,
&nearest_second, &nearby_second, &best_mv_second, rct,
mbmi->second_ref_frame, pbi->common.ref_frame_sign_bias);
}
else
{
mbmi->second_ref_frame = 0;
}
mbmi->uv_mode = DC_PRED;
switch (mbmi->mode)
{
case SPLITMV:
{
const int s = mbmi->partitioning =
vp8_treed_read(bc, vp8_mbsplit_tree, vp8_mbsplit_probs);
const int num_p = vp8_mbsplit_count [s];
int j = 0;
mbmi->need_to_clamp_mvs = 0;
do /* for each subset j */
{
int_mv leftmv, abovemv, second_leftmv, second_abovemv;
int_mv blockmv, secondmv;
int k; /* first block in subset j */
int mv_contz;
int blockmode;
k = vp8_mbsplit_offset[s][j];
leftmv.as_int = left_block_mv(mi, k);
abovemv.as_int = above_block_mv(mi, k, mis);
if (mbmi->second_ref_frame)
{
second_leftmv.as_int = left_block_second_mv(mi, k);
second_abovemv.as_int = above_block_second_mv(mi, k, mis);
}
mv_contz = vp8_mv_cont(&leftmv, &abovemv);
blockmode = sub_mv_ref(bc, vp8_sub_mv_ref_prob2 [mv_contz]);
switch (blockmode)
{
case NEW4X4:
#if CONFIG_HIGH_PRECISION_MV
if (xd->allow_high_precision_mv)
{
read_mv_hp(bc, &blockmv.as_mv, (const MV_CONTEXT_HP *) mvc_hp);
#if CONFIG_ADAPTIVE_ENTROPY
cm->fc.MVcount_hp[0][mv_max_hp+(blockmv.as_mv.row)]++;
cm->fc.MVcount_hp[1][mv_max_hp+(blockmv.as_mv.col)]++;
#endif
}
else
#endif
{
read_mv(bc, &blockmv.as_mv, (const MV_CONTEXT *) mvc);
#if CONFIG_ADAPTIVE_ENTROPY
cm->fc.MVcount[0][mv_max+(blockmv.as_mv.row>>1)]++;
cm->fc.MVcount[1][mv_max+(blockmv.as_mv.col>>1)]++;
#endif
}
blockmv.as_mv.row += best_mv.as_mv.row;
blockmv.as_mv.col += best_mv.as_mv.col;
if (mbmi->second_ref_frame)
{
#if CONFIG_HIGH_PRECISION_MV
if (xd->allow_high_precision_mv)
read_mv_hp(bc, &secondmv.as_mv, (const MV_CONTEXT_HP *) mvc_hp);
else
#endif
read_mv(bc, &secondmv.as_mv, (const MV_CONTEXT *) mvc);
secondmv.as_mv.row += best_mv_second.as_mv.row;
secondmv.as_mv.col += best_mv_second.as_mv.col;
}
#ifdef VPX_MODE_COUNT
vp8_mv_cont_count[mv_contz][3]++;
#endif
break;
case LEFT4X4:
blockmv.as_int = leftmv.as_int;
if (mbmi->second_ref_frame)
secondmv.as_int = second_leftmv.as_int;
#ifdef VPX_MODE_COUNT
vp8_mv_cont_count[mv_contz][0]++;
#endif
break;
case ABOVE4X4:
blockmv.as_int = abovemv.as_int;
if (mbmi->second_ref_frame)
secondmv.as_int = second_abovemv.as_int;
#ifdef VPX_MODE_COUNT
vp8_mv_cont_count[mv_contz][1]++;
#endif
break;
case ZERO4X4:
blockmv.as_int = 0;
if (mbmi->second_ref_frame)
secondmv.as_int = 0;
#ifdef VPX_MODE_COUNT
vp8_mv_cont_count[mv_contz][2]++;
#endif
break;
default:
break;
}
mbmi->need_to_clamp_mvs |= vp8_check_mv_bounds(&blockmv,
mb_to_left_edge,
mb_to_right_edge,
mb_to_top_edge,
mb_to_bottom_edge);
if (mbmi->second_ref_frame)
{
mbmi->need_to_clamp_mvs |= vp8_check_mv_bounds(&secondmv,
mb_to_left_edge,
mb_to_right_edge,
mb_to_top_edge,
mb_to_bottom_edge);
}
{
/* Fill (uniform) modes, mvs of jth subset.
Must do it here because ensuing subsets can
refer back to us via "left" or "above". */
const unsigned char *fill_offset;
unsigned int fill_count = mbsplit_fill_count[s];
fill_offset = &mbsplit_fill_offset[s][(unsigned char)j * mbsplit_fill_count[s]];
do {
mi->bmi[ *fill_offset].as_mv.first.as_int = blockmv.as_int;
if (mbmi->second_ref_frame)
mi->bmi[ *fill_offset].as_mv.second.as_int = secondmv.as_int;
fill_offset++;
}while (--fill_count);
}
}
while (++j < num_p);
}
mv->as_int = mi->bmi[15].as_mv.first.as_int;
mbmi->second_mv.as_int = mi->bmi[15].as_mv.second.as_int;
break; /* done with SPLITMV */
case NEARMV:
mv->as_int = nearby.as_int;
/* Clip "next_nearest" so that it does not extend to far out of image */
vp8_clamp_mv(mv, mb_to_left_edge, mb_to_right_edge,
mb_to_top_edge, mb_to_bottom_edge);
if (mbmi->second_ref_frame)
{
mbmi->second_mv.as_int = nearby_second.as_int;
vp8_clamp_mv(&mbmi->second_mv, mb_to_left_edge, mb_to_right_edge,
mb_to_top_edge, mb_to_bottom_edge);
}
break;
case NEARESTMV:
mv->as_int = nearest.as_int;
/* Clip "next_nearest" so that it does not extend to far out of image */
vp8_clamp_mv(mv, mb_to_left_edge, mb_to_right_edge,
mb_to_top_edge, mb_to_bottom_edge);
if (mbmi->second_ref_frame)
{
mbmi->second_mv.as_int = nearest_second.as_int;
vp8_clamp_mv(&mbmi->second_mv, mb_to_left_edge, mb_to_right_edge,
mb_to_top_edge, mb_to_bottom_edge);
}
break;
case ZEROMV:
mv->as_int = 0;
if (mbmi->second_ref_frame)
mbmi->second_mv.as_int = 0;
break;
case NEWMV:
#if CONFIG_HIGH_PRECISION_MV
if (xd->allow_high_precision_mv)
{
read_mv_hp(bc, &mv->as_mv, (const MV_CONTEXT_HP *) mvc_hp);
#if CONFIG_ADAPTIVE_ENTROPY
cm->fc.MVcount_hp[0][mv_max_hp+(mv->as_mv.row)]++;
cm->fc.MVcount_hp[1][mv_max_hp+(mv->as_mv.col)]++;
#endif
}
else
#endif
{
read_mv(bc, &mv->as_mv, (const MV_CONTEXT *) mvc);
#if CONFIG_ADAPTIVE_ENTROPY
cm->fc.MVcount[0][mv_max+(mv->as_mv.row>>1)]++;
cm->fc.MVcount[1][mv_max+(mv->as_mv.col>>1)]++;
#endif
}
mv->as_mv.row += best_mv.as_mv.row;
mv->as_mv.col += best_mv.as_mv.col;
/* Don't need to check this on NEARMV and NEARESTMV modes
* since those modes clamp the MV. The NEWMV mode does not,
* so signal to the prediction stage whether special
* handling may be required.
*/
mbmi->need_to_clamp_mvs = vp8_check_mv_bounds(mv,
mb_to_left_edge,
mb_to_right_edge,
mb_to_top_edge,
mb_to_bottom_edge);
if (mbmi->second_ref_frame)
{
#if CONFIG_HIGH_PRECISION_MV
if (xd->allow_high_precision_mv)
read_mv_hp(bc, &mbmi->second_mv.as_mv,
(const MV_CONTEXT_HP *) mvc_hp);
else
#endif
read_mv(bc, &mbmi->second_mv.as_mv, (const MV_CONTEXT *) mvc);
mbmi->second_mv.as_mv.row += best_mv_second.as_mv.row;
mbmi->second_mv.as_mv.col += best_mv_second.as_mv.col;
mbmi->need_to_clamp_secondmv |= vp8_check_mv_bounds(&mbmi->second_mv,
mb_to_left_edge,
mb_to_right_edge,
mb_to_top_edge,
mb_to_bottom_edge);
}
break;
default:;
#if CONFIG_DEBUG
assert(0);
#endif
}
}
else
{
/* required for left and above block mv */
mbmi->mv.as_int = 0;
if ( segfeature_active( xd, mbmi->segment_id, SEG_LVL_MODE ) )
mbmi->mode = (MB_PREDICTION_MODE)
get_segdata( xd, mbmi->segment_id, SEG_LVL_MODE );
else
{
mbmi->mode = (MB_PREDICTION_MODE)
vp8_read_ymode(bc, pbi->common.fc.ymode_prob);
#if CONFIG_ADAPTIVE_ENTROPY
pbi->common.fc.ymode_counts[mbmi->mode]++;
#endif
}
#if CONFIG_COMP_INTRA_PRED
mbmi->second_mode = (MB_PREDICTION_MODE) (DC_PRED - 1);
#endif
// If MB mode is BPRED read the block modes
if (mbmi->mode == B_PRED)
{
int j = 0;
#if CONFIG_COMP_INTRA_PRED
int use_comp_pred = vp8_read(bc, 128);
#endif
do
{
mi->bmi[j].as_mode.first = (B_PREDICTION_MODE)vp8_read_bmode(bc, pbi->common.fc.bmode_prob);
#if CONFIG_ADAPTIVE_ENTROPY
pbi->common.fc.bmode_counts[mi->bmi[j].as_mode.first]++;
#endif
#if CONFIG_COMP_INTRA_PRED
if (use_comp_pred)
{
mi->bmi[j].as_mode.second = (B_PREDICTION_MODE)vp8_read_bmode(bc, pbi->common.fc.bmode_prob);
}
else
{
mi->bmi[j].as_mode.second = (B_PREDICTION_MODE) (B_DC_PRED - 1);
}
#endif
}
while (++j < 16);
}
if(mbmi->mode == I8X8_PRED)
{
int i;
int mode8x8;
for(i=0;i<4;i++)
{
int ib = vp8_i8x8_block[i];
mode8x8 = vp8_read_i8x8_mode(bc, pbi->common.fc.i8x8_mode_prob);
mi->bmi[ib+0].as_mode.first= mode8x8;
mi->bmi[ib+1].as_mode.first= mode8x8;
mi->bmi[ib+4].as_mode.first= mode8x8;
mi->bmi[ib+5].as_mode.first= mode8x8;
#if CONFIG_ADAPTIVE_ENTROPY
pbi->common.fc.i8x8_mode_counts[mode8x8]++;
#endif
#if CONFIG_COMP_INTRA_PRED
mi->bmi[ib+0].as_mode.second= (MB_PREDICTION_MODE) (DC_PRED - 1);
mi->bmi[ib+1].as_mode.second= (MB_PREDICTION_MODE) (DC_PRED - 1);
mi->bmi[ib+4].as_mode.second= (MB_PREDICTION_MODE) (DC_PRED - 1);
mi->bmi[ib+5].as_mode.second= (MB_PREDICTION_MODE) (DC_PRED - 1);
#endif
}
}
else
{
mbmi->uv_mode = (MB_PREDICTION_MODE)vp8_read_uv_mode(bc,
pbi->common.fc.uv_mode_prob[mbmi->mode]);
#if CONFIG_ADAPTIVE_ENTROPY
pbi->common.fc.uv_mode_counts[mbmi->mode][mbmi->uv_mode]++;
#endif
}
#if CONFIG_COMP_INTRA_PRED
mbmi->second_uv_mode = (MB_PREDICTION_MODE) (DC_PRED - 1);
#endif
}
}
void vp8_decode_mode_mvs(VP8D_COMP *pbi)
{
int i;
VP8_COMMON *cm = &pbi->common;
MODE_INFO *mi = cm->mi;
MACROBLOCKD *const xd = &pbi->mb;
int sb_row, sb_col;
int sb_rows = (cm->mb_rows + 1)>>1;
int sb_cols = (cm->mb_cols + 1)>>1;
int row_delta[4] = { 0, +1, 0, -1};
int col_delta[4] = {+1, -1, +1, +1};
MODE_INFO *prev_mi = cm->prev_mi;
mb_mode_mv_init(pbi);
if(cm->frame_type==KEY_FRAME && !cm->kf_ymode_probs_update)
{
cm->kf_ymode_probs_index = vp8_read_literal(&pbi->bc, 3);
}
for (sb_row=0; sb_row<sb_rows; sb_row++)
{
int mb_col = 0;
int mb_row = (sb_row <<1);
for (sb_col=0; sb_col<sb_cols; sb_col++)
{
for ( i=0; i<4; i++ )
{
int mb_to_top_edge;
int mb_to_bottom_edge;
int dy = row_delta[i];
int dx = col_delta[i];
int offset_extended = dy * cm->mode_info_stride + dx;
if ((mb_row >= cm->mb_rows) || (mb_col >= cm->mb_cols))
{
/* next macroblock */
mb_row += dy;
mb_col += dx;
mi += offset_extended;
prev_mi += offset_extended;
continue;
}
// Make sure the MacroBlockD mode info pointer is set correctly
xd->mode_info_context = mi;
xd->prev_mode_info_context = prev_mi;
pbi->mb.mb_to_top_edge = mb_to_top_edge = -((mb_row * 16)) << 3;
mb_to_top_edge -= LEFT_TOP_MARGIN;
pbi->mb.mb_to_bottom_edge =
mb_to_bottom_edge =
((pbi->common.mb_rows - 1 - mb_row) * 16) << 3;
mb_to_bottom_edge += RIGHT_BOTTOM_MARGIN;
if(cm->frame_type == KEY_FRAME)
vp8_kfread_modes(pbi, mi, mb_row, mb_col);
else
read_mb_modes_mv(pbi, mi, &mi->mbmi, prev_mi, mb_row,
mb_col);
/* next macroblock */
mb_row += dy;
mb_col += dx;
mi += offset_extended;
prev_mi += offset_extended;
}
}
mi += cm->mode_info_stride + (1 - (cm->mb_cols & 0x1));
prev_mi += cm->mode_info_stride + (1 - (cm->mb_cols & 0x1));
}
}
Reference in New Issue View Git Blame Copy Permalink