217 строки
7.1 KiB
C
217 строки
7.1 KiB
C
/*
|
|
* 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 "vpx_mem/vpx_mem.h"
|
|
#include "vpx_ports/mem.h"
|
|
|
|
#include "vp9/common/vp9_blockd.h"
|
|
#include "vp9/common/vp9_common.h"
|
|
#include "vp9/common/vp9_entropy.h"
|
|
#if CONFIG_COEFFICIENT_RANGE_CHECKING
|
|
#include "vp9/common/vp9_idct.h"
|
|
#endif
|
|
|
|
#include "vp9/decoder/vp9_detokenize.h"
|
|
|
|
#define EOB_CONTEXT_NODE 0
|
|
#define ZERO_CONTEXT_NODE 1
|
|
#define ONE_CONTEXT_NODE 2
|
|
|
|
#define INCREMENT_COUNT(token) \
|
|
do { \
|
|
if (counts) \
|
|
++coef_counts[band][ctx][token]; \
|
|
} while (0)
|
|
|
|
static INLINE int read_coeff(const vpx_prob *probs, int n, vpx_reader *r) {
|
|
int i, val = 0;
|
|
for (i = 0; i < n; ++i)
|
|
val = (val << 1) | vpx_read(r, probs[i]);
|
|
return val;
|
|
}
|
|
|
|
static int decode_coefs(const MACROBLOCKD *xd,
|
|
PLANE_TYPE type,
|
|
tran_low_t *dqcoeff, TX_SIZE tx_size, const int16_t *dq,
|
|
int ctx, const int16_t *scan, const int16_t *nb,
|
|
vpx_reader *r) {
|
|
FRAME_COUNTS *counts = xd->counts;
|
|
const int max_eob = 16 << (tx_size << 1);
|
|
const FRAME_CONTEXT *const fc = xd->fc;
|
|
const int ref = is_inter_block(xd->mi[0]);
|
|
int band, c = 0;
|
|
const vpx_prob (*coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] =
|
|
fc->coef_probs[tx_size][type][ref];
|
|
const vpx_prob *prob;
|
|
unsigned int (*coef_counts)[COEFF_CONTEXTS][UNCONSTRAINED_NODES + 1];
|
|
unsigned int (*eob_branch_count)[COEFF_CONTEXTS];
|
|
uint8_t token_cache[32 * 32];
|
|
const uint8_t *band_translate = get_band_translate(tx_size);
|
|
const int dq_shift = (tx_size == TX_32X32);
|
|
int v, token;
|
|
int16_t dqv = dq[0];
|
|
const uint8_t *const cat6_prob =
|
|
#if CONFIG_VP9_HIGHBITDEPTH
|
|
(xd->bd == VPX_BITS_12) ? vp9_cat6_prob_high12 :
|
|
(xd->bd == VPX_BITS_10) ? vp9_cat6_prob_high12 + 2 :
|
|
#endif // CONFIG_VP9_HIGHBITDEPTH
|
|
vp9_cat6_prob;
|
|
const int cat6_bits =
|
|
#if CONFIG_VP9_HIGHBITDEPTH
|
|
(xd->bd == VPX_BITS_12) ? 18 :
|
|
(xd->bd == VPX_BITS_10) ? 16 :
|
|
#endif // CONFIG_VP9_HIGHBITDEPTH
|
|
14;
|
|
|
|
if (counts) {
|
|
coef_counts = counts->coef[tx_size][type][ref];
|
|
eob_branch_count = counts->eob_branch[tx_size][type][ref];
|
|
}
|
|
|
|
while (c < max_eob) {
|
|
int val = -1;
|
|
band = *band_translate++;
|
|
prob = coef_probs[band][ctx];
|
|
if (counts)
|
|
++eob_branch_count[band][ctx];
|
|
if (!vpx_read(r, prob[EOB_CONTEXT_NODE])) {
|
|
INCREMENT_COUNT(EOB_MODEL_TOKEN);
|
|
break;
|
|
}
|
|
|
|
while (!vpx_read(r, prob[ZERO_CONTEXT_NODE])) {
|
|
INCREMENT_COUNT(ZERO_TOKEN);
|
|
dqv = dq[1];
|
|
token_cache[scan[c]] = 0;
|
|
++c;
|
|
if (c >= max_eob)
|
|
return c; // zero tokens at the end (no eob token)
|
|
ctx = get_coef_context(nb, token_cache, c);
|
|
band = *band_translate++;
|
|
prob = coef_probs[band][ctx];
|
|
}
|
|
|
|
if (!vpx_read(r, prob[ONE_CONTEXT_NODE])) {
|
|
INCREMENT_COUNT(ONE_TOKEN);
|
|
token = ONE_TOKEN;
|
|
val = 1;
|
|
} else {
|
|
INCREMENT_COUNT(TWO_TOKEN);
|
|
token = vpx_read_tree(r, vp9_coef_con_tree,
|
|
vp9_pareto8_full[prob[PIVOT_NODE] - 1]);
|
|
switch (token) {
|
|
case TWO_TOKEN:
|
|
case THREE_TOKEN:
|
|
case FOUR_TOKEN:
|
|
val = token;
|
|
break;
|
|
case CATEGORY1_TOKEN:
|
|
val = CAT1_MIN_VAL + read_coeff(vp9_cat1_prob, 1, r);
|
|
break;
|
|
case CATEGORY2_TOKEN:
|
|
val = CAT2_MIN_VAL + read_coeff(vp9_cat2_prob, 2, r);
|
|
break;
|
|
case CATEGORY3_TOKEN:
|
|
val = CAT3_MIN_VAL + read_coeff(vp9_cat3_prob, 3, r);
|
|
break;
|
|
case CATEGORY4_TOKEN:
|
|
val = CAT4_MIN_VAL + read_coeff(vp9_cat4_prob, 4, r);
|
|
break;
|
|
case CATEGORY5_TOKEN:
|
|
val = CAT5_MIN_VAL + read_coeff(vp9_cat5_prob, 5, r);
|
|
break;
|
|
case CATEGORY6_TOKEN:
|
|
val = CAT6_MIN_VAL + read_coeff(cat6_prob, cat6_bits, r);
|
|
break;
|
|
}
|
|
}
|
|
v = (val * dqv) >> dq_shift;
|
|
#if CONFIG_COEFFICIENT_RANGE_CHECKING
|
|
#if CONFIG_VP9_HIGHBITDEPTH
|
|
dqcoeff[scan[c]] = highbd_check_range((vpx_read_bit(r) ? -v : v),
|
|
xd->bd);
|
|
#else
|
|
dqcoeff[scan[c]] = check_range(vpx_read_bit(r) ? -v : v);
|
|
#endif // CONFIG_VP9_HIGHBITDEPTH
|
|
#else
|
|
dqcoeff[scan[c]] = vpx_read_bit(r) ? -v : v;
|
|
#endif // CONFIG_COEFFICIENT_RANGE_CHECKING
|
|
token_cache[scan[c]] = vp9_pt_energy_class[token];
|
|
++c;
|
|
ctx = get_coef_context(nb, token_cache, c);
|
|
dqv = dq[1];
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
// TODO(slavarnway): Decode version of vp9_set_context. Modify vp9_set_context
|
|
// after testing is complete, then delete this version.
|
|
static
|
|
void dec_set_contexts(const MACROBLOCKD *xd, struct macroblockd_plane *pd,
|
|
TX_SIZE tx_size, int has_eob,
|
|
int aoff, int loff) {
|
|
ENTROPY_CONTEXT *const a = pd->above_context + aoff;
|
|
ENTROPY_CONTEXT *const l = pd->left_context + loff;
|
|
const int tx_size_in_blocks = 1 << tx_size;
|
|
|
|
// above
|
|
if (has_eob && xd->mb_to_right_edge < 0) {
|
|
int i;
|
|
const int blocks_wide = pd->n4_w +
|
|
(xd->mb_to_right_edge >> (5 + pd->subsampling_x));
|
|
int above_contexts = tx_size_in_blocks;
|
|
if (above_contexts + aoff > blocks_wide)
|
|
above_contexts = blocks_wide - aoff;
|
|
|
|
for (i = 0; i < above_contexts; ++i)
|
|
a[i] = has_eob;
|
|
for (i = above_contexts; i < tx_size_in_blocks; ++i)
|
|
a[i] = 0;
|
|
} else {
|
|
memset(a, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks);
|
|
}
|
|
|
|
// left
|
|
if (has_eob && xd->mb_to_bottom_edge < 0) {
|
|
int i;
|
|
const int blocks_high = pd->n4_h +
|
|
(xd->mb_to_bottom_edge >> (5 + pd->subsampling_y));
|
|
int left_contexts = tx_size_in_blocks;
|
|
if (left_contexts + loff > blocks_high)
|
|
left_contexts = blocks_high - loff;
|
|
|
|
for (i = 0; i < left_contexts; ++i)
|
|
l[i] = has_eob;
|
|
for (i = left_contexts; i < tx_size_in_blocks; ++i)
|
|
l[i] = 0;
|
|
} else {
|
|
memset(l, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks);
|
|
}
|
|
}
|
|
|
|
int vp9_decode_block_tokens(MACROBLOCKD *xd,
|
|
int plane, const scan_order *sc,
|
|
int x, int y,
|
|
TX_SIZE tx_size, vpx_reader *r,
|
|
int seg_id) {
|
|
struct macroblockd_plane *const pd = &xd->plane[plane];
|
|
const int16_t *const dequant = pd->seg_dequant[seg_id];
|
|
const int ctx = get_entropy_context(tx_size, pd->above_context + x,
|
|
pd->left_context + y);
|
|
const int eob = decode_coefs(xd, get_plane_type(plane),
|
|
pd->dqcoeff, tx_size,
|
|
dequant, ctx, sc->scan, sc->neighbors, r);
|
|
dec_set_contexts(xd, pd, tx_size, eob > 0, x, y);
|
|
return eob;
|
|
}
|
|
|
|
|