ref: fcccbcbb395ce4cf31b54ce1245cc28e5e3ef4c1
dir: /vp9/decoder/vp9_detokenize.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 "vp9/common/vp9_type_aliases.h"
#include "vp9/common/vp9_blockd.h"
#include "vp9_onyxd_int.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
#include "vp9_detokenize.h"
#include "vp9/common/vp9_seg_common.h"
#define EOB_CONTEXT_NODE 0
#define ZERO_CONTEXT_NODE 1
#define ONE_CONTEXT_NODE 2
#define LOW_VAL_CONTEXT_NODE 3
#define TWO_CONTEXT_NODE 4
#define THREE_CONTEXT_NODE 5
#define HIGH_LOW_CONTEXT_NODE 6
#define CAT_ONE_CONTEXT_NODE 7
#define CAT_THREEFOUR_CONTEXT_NODE 8
#define CAT_THREE_CONTEXT_NODE 9
#define CAT_FIVE_CONTEXT_NODE 10
#define CAT1_MIN_VAL 5
#define CAT2_MIN_VAL 7
#define CAT3_MIN_VAL 11
#define CAT4_MIN_VAL 19
#define CAT5_MIN_VAL 35
#define CAT6_MIN_VAL 67
#define CAT1_PROB0 159
#define CAT2_PROB0 145
#define CAT2_PROB1 165
#define CAT3_PROB0 140
#define CAT3_PROB1 148
#define CAT3_PROB2 173
#define CAT4_PROB0 135
#define CAT4_PROB1 140
#define CAT4_PROB2 155
#define CAT4_PROB3 176
#define CAT5_PROB0 130
#define CAT5_PROB1 134
#define CAT5_PROB2 141
#define CAT5_PROB3 157
#define CAT5_PROB4 180
static const unsigned char cat6_prob[14] =
{ 254, 254, 252, 249, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0 };
void vp9_reset_mb_tokens_context(MACROBLOCKD* const xd) {
/* Clear entropy contexts for Y2 blocks */
if ((xd->mode_info_context->mbmi.mode != B_PRED &&
xd->mode_info_context->mbmi.mode != I8X8_PRED &&
xd->mode_info_context->mbmi.mode != SPLITMV)
|| xd->mode_info_context->mbmi.txfm_size == TX_16X16
) {
vpx_memset(xd->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
vpx_memset(xd->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
} else {
vpx_memset(xd->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES) - 1);
vpx_memset(xd->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES) - 1);
}
}
DECLARE_ALIGNED(16, extern const unsigned char, vp9_norm[256]);
static int get_signed(BOOL_DECODER *br, int value_to_sign) {
const int split = (br->range + 1) >> 1;
const VP9_BD_VALUE bigsplit = (VP9_BD_VALUE)split << (VP9_BD_VALUE_SIZE - 8);
int v;
if (br->count < 0)
vp9_bool_decoder_fill(br);
if (br->value < bigsplit) {
br->range = split;
v = value_to_sign;
} else {
br->range = br->range - split;
br->value = br->value - bigsplit;
v = -value_to_sign;
}
br->range += br->range;
br->value += br->value;
--br->count;
return v;
}
#define INCREMENT_COUNT(token) \
do { \
coef_counts[coef_bands[c]][pt][token]++; \
pt = vp9_prev_token_class[token]; \
} while (0)
#define WRITE_COEF_CONTINUE(val, token) \
{ \
qcoeff_ptr[scan[c]] = (INT16) get_signed(br, val); \
INCREMENT_COUNT(token); \
c++; \
continue; \
}
#define ADJUST_COEF(prob, bits_count) \
do { \
if (vp9_read(br, prob)) \
val += (UINT16)(1 << bits_count);\
} while (0);
static int decode_coefs(VP9D_COMP *dx, const MACROBLOCKD *xd,
BOOL_DECODER* const br,
ENTROPY_CONTEXT *a, ENTROPY_CONTEXT *l,
PLANE_TYPE type,
TX_TYPE tx_type,
int seg_eob, INT16 *qcoeff_ptr,
const int *const scan, TX_SIZE txfm_size,
const int *coef_bands) {
FRAME_CONTEXT *const fc = &dx->common.fc;
int pt, c = (type == PLANE_TYPE_Y_NO_DC);
vp9_prob (*coef_probs)[PREV_COEF_CONTEXTS][ENTROPY_NODES], *prob;
unsigned int (*coef_counts)[PREV_COEF_CONTEXTS][MAX_ENTROPY_TOKENS];
switch (txfm_size) {
default:
case TX_4X4:
if (tx_type == DCT_DCT) {
coef_probs = fc->coef_probs[type];
coef_counts = fc->coef_counts[type];
} else {
coef_probs = fc->hybrid_coef_probs[type];
coef_counts = fc->hybrid_coef_counts[type];
}
break;
case TX_8X8:
if (tx_type == DCT_DCT) {
coef_probs = fc->coef_probs_8x8[type];
coef_counts = fc->coef_counts_8x8[type];
} else {
coef_probs = fc->hybrid_coef_probs_8x8[type];
coef_counts = fc->hybrid_coef_counts_8x8[type];
}
break;
case TX_16X16:
if (tx_type == DCT_DCT) {
coef_probs = fc->coef_probs_16x16[type];
coef_counts = fc->coef_counts_16x16[type];
} else {
coef_probs = fc->hybrid_coef_probs_16x16[type];
coef_counts = fc->hybrid_coef_counts_16x16[type];
}
break;
}
VP9_COMBINEENTROPYCONTEXTS(pt, *a, *l);
while (1) {
int val;
const uint8_t *cat6 = cat6_prob;
if (c >= seg_eob) break;
prob = coef_probs[coef_bands[c]][pt];
if (!vp9_read(br, prob[EOB_CONTEXT_NODE]))
break;
SKIP_START:
if (c >= seg_eob) break;
if (!vp9_read(br, prob[ZERO_CONTEXT_NODE])) {
INCREMENT_COUNT(ZERO_TOKEN);
++c;
prob = coef_probs[coef_bands[c]][pt];
goto SKIP_START;
}
// ONE_CONTEXT_NODE_0_
if (!vp9_read(br, prob[ONE_CONTEXT_NODE])) {
WRITE_COEF_CONTINUE(1, ONE_TOKEN);
}
// LOW_VAL_CONTEXT_NODE_0_
if (!vp9_read(br, prob[LOW_VAL_CONTEXT_NODE])) {
if (!vp9_read(br, prob[TWO_CONTEXT_NODE])) {
WRITE_COEF_CONTINUE(2, TWO_TOKEN);
}
if (!vp9_read(br, prob[THREE_CONTEXT_NODE])) {
WRITE_COEF_CONTINUE(3, THREE_TOKEN);
}
WRITE_COEF_CONTINUE(4, FOUR_TOKEN);
}
// HIGH_LOW_CONTEXT_NODE_0_
if (!vp9_read(br, prob[HIGH_LOW_CONTEXT_NODE])) {
if (!vp9_read(br, prob[CAT_ONE_CONTEXT_NODE])) {
val = CAT1_MIN_VAL;
ADJUST_COEF(CAT1_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY1);
}
val = CAT2_MIN_VAL;
ADJUST_COEF(CAT2_PROB1, 1);
ADJUST_COEF(CAT2_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY2);
}
// CAT_THREEFOUR_CONTEXT_NODE_0_
if (!vp9_read(br, prob[CAT_THREEFOUR_CONTEXT_NODE])) {
if (!vp9_read(br, prob[CAT_THREE_CONTEXT_NODE])) {
val = CAT3_MIN_VAL;
ADJUST_COEF(CAT3_PROB2, 2);
ADJUST_COEF(CAT3_PROB1, 1);
ADJUST_COEF(CAT3_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY3);
}
val = CAT4_MIN_VAL;
ADJUST_COEF(CAT4_PROB3, 3);
ADJUST_COEF(CAT4_PROB2, 2);
ADJUST_COEF(CAT4_PROB1, 1);
ADJUST_COEF(CAT4_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY4);
}
// CAT_FIVE_CONTEXT_NODE_0_:
if (!vp9_read(br, prob[CAT_FIVE_CONTEXT_NODE])) {
val = CAT5_MIN_VAL;
ADJUST_COEF(CAT5_PROB4, 4);
ADJUST_COEF(CAT5_PROB3, 3);
ADJUST_COEF(CAT5_PROB2, 2);
ADJUST_COEF(CAT5_PROB1, 1);
ADJUST_COEF(CAT5_PROB0, 0);
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY5);
}
val = 0;
while (*cat6) {
val = (val << 1) | vp9_read(br, *cat6++);
}
val += CAT6_MIN_VAL;
WRITE_COEF_CONTINUE(val, DCT_VAL_CATEGORY6);
}
if (c < seg_eob)
coef_counts[coef_bands[c]][pt][DCT_EOB_TOKEN]++;
a[0] = l[0] = (c != !type);
return c;
}
static int get_eob(MACROBLOCKD* const xd, int segment_id, int eob_max) {
int active = vp9_segfeature_active(xd, segment_id, SEG_LVL_EOB);
int eob = vp9_get_segdata(xd, segment_id, SEG_LVL_EOB);
if (!active || eob > eob_max)
eob = eob_max;
return eob;
}
static int vp9_decode_mb_tokens_16x16(VP9D_COMP* const pbi,
MACROBLOCKD* const xd,
BOOL_DECODER* const bc) {
ENTROPY_CONTEXT* const A = (ENTROPY_CONTEXT *)xd->above_context;
ENTROPY_CONTEXT* const L = (ENTROPY_CONTEXT *)xd->left_context;
unsigned short* const eobs = xd->eobs;
const int segment_id = xd->mode_info_context->mbmi.segment_id;
int c, i, eobtotal = 0, seg_eob;
// Luma block
eobs[0] = c = decode_coefs(pbi, xd, bc, A, L, PLANE_TYPE_Y_WITH_DC,
get_tx_type(xd, &xd->block[0]),
get_eob(xd, segment_id, 256),
xd->qcoeff, vp9_default_zig_zag1d_16x16,
TX_16X16, vp9_coef_bands_16x16);
A[1] = A[2] = A[3] = A[0];
L[1] = L[2] = L[3] = L[0];
eobtotal += c;
// 8x8 chroma blocks
seg_eob = get_eob(xd, segment_id, 64);
for (i = 16; i < 24; i += 4) {
ENTROPY_CONTEXT* const a = A + vp9_block2above_8x8[i];
ENTROPY_CONTEXT* const l = L + vp9_block2left_8x8[i];
eobs[i] = c = decode_coefs(pbi, xd, bc, a, l, PLANE_TYPE_UV,
DCT_DCT, seg_eob, xd->block[i].qcoeff,
vp9_default_zig_zag1d_8x8,
TX_8X8, vp9_coef_bands_8x8);
a[1] = a[0];
l[1] = l[0];
eobtotal += c;
}
// no Y2 block
vpx_memset(&A[8], 0, sizeof(A[8]));
vpx_memset(&L[8], 0, sizeof(L[8]));
return eobtotal;
}
static int vp9_decode_mb_tokens_8x8(VP9D_COMP* const pbi,
MACROBLOCKD* const xd,
BOOL_DECODER* const bc) {
ENTROPY_CONTEXT *const A = (ENTROPY_CONTEXT *)xd->above_context;
ENTROPY_CONTEXT *const L = (ENTROPY_CONTEXT *)xd->left_context;
unsigned short *const eobs = xd->eobs;
PLANE_TYPE type;
int c, i, eobtotal = 0, seg_eob;
const int segment_id = xd->mode_info_context->mbmi.segment_id;
// 2nd order DC block
if (xd->mode_info_context->mbmi.mode != B_PRED &&
xd->mode_info_context->mbmi.mode != SPLITMV &&
xd->mode_info_context->mbmi.mode != I8X8_PRED) {
ENTROPY_CONTEXT *const a = A + vp9_block2above_8x8[24];
ENTROPY_CONTEXT *const l = L + vp9_block2left_8x8[24];
eobs[24] = c = decode_coefs(pbi, xd, bc, a, l, PLANE_TYPE_Y2,
DCT_DCT, get_eob(xd, segment_id, 4),
xd->block[24].qcoeff,
vp9_default_zig_zag1d, TX_8X8, vp9_coef_bands);
eobtotal += c - 4;
type = PLANE_TYPE_Y_NO_DC;
} else {
type = PLANE_TYPE_Y_WITH_DC;
}
// luma blocks
seg_eob = get_eob(xd, segment_id, 64);
for (i = 0; i < 16; i += 4) {
ENTROPY_CONTEXT *const a = A + vp9_block2above_8x8[i];
ENTROPY_CONTEXT *const l = L + vp9_block2left_8x8[i];
eobs[i] = c = decode_coefs(pbi, xd, bc, a, l, type,
type == PLANE_TYPE_Y_WITH_DC ?
get_tx_type(xd, xd->block + i) : DCT_DCT,
seg_eob, xd->block[i].qcoeff,
vp9_default_zig_zag1d_8x8,
TX_8X8, vp9_coef_bands_8x8);
a[1] = a[0];
l[1] = l[0];
eobtotal += c;
}
// chroma blocks
if (xd->mode_info_context->mbmi.mode == I8X8_PRED ||
xd->mode_info_context->mbmi.mode == SPLITMV) {
// use 4x4 transform for U, V components in I8X8/splitmv prediction mode
seg_eob = get_eob(xd, segment_id, 16);
for (i = 16; i < 24; i++) {
ENTROPY_CONTEXT *const a = A + vp9_block2above[i];
ENTROPY_CONTEXT *const l = L + vp9_block2left[i];
eobs[i] = c = decode_coefs(pbi, xd, bc, a, l, PLANE_TYPE_UV,
DCT_DCT, seg_eob, xd->block[i].qcoeff,
vp9_default_zig_zag1d, TX_4X4, vp9_coef_bands);
eobtotal += c;
}
} else {
for (i = 16; i < 24; i += 4) {
ENTROPY_CONTEXT *const a = A + vp9_block2above_8x8[i];
ENTROPY_CONTEXT *const l = L + vp9_block2left_8x8[i];
eobs[i] = c = decode_coefs(pbi, xd, bc, a, l, PLANE_TYPE_UV,
DCT_DCT, seg_eob, xd->block[i].qcoeff,
vp9_default_zig_zag1d_8x8,
TX_8X8, vp9_coef_bands_8x8);
a[1] = a[0];
l[1] = l[0];
eobtotal += c;
}
}
return eobtotal;
}
int vp9_decode_coefs_4x4(VP9D_COMP *dx, MACROBLOCKD *xd,
BOOL_DECODER* const bc,
PLANE_TYPE type, int i) {
ENTROPY_CONTEXT *const A = (ENTROPY_CONTEXT *)xd->above_context;
ENTROPY_CONTEXT *const L = (ENTROPY_CONTEXT *)xd->left_context;
ENTROPY_CONTEXT *const a = A + vp9_block2above[i];
ENTROPY_CONTEXT *const l = L + vp9_block2left[i];
INT16 *qcoeff_ptr = &xd->qcoeff[0];
const int *scan = vp9_default_zig_zag1d;
unsigned short *const eobs = xd->eobs;
int segment_id = xd->mode_info_context->mbmi.segment_id;
int c, seg_eob = get_eob(xd, segment_id, 16);
TX_TYPE tx_type = DCT_DCT;
if (type == PLANE_TYPE_Y_WITH_DC)
tx_type = get_tx_type(xd, &xd->block[i]);
switch (tx_type) {
case ADST_DCT :
scan = vp9_row_scan;
break;
case DCT_ADST :
scan = vp9_col_scan;
break;
default :
scan = vp9_default_zig_zag1d;
break;
}
eobs[i] = c = decode_coefs(dx, xd, bc, a, l, type,
tx_type, seg_eob, qcoeff_ptr + i * 16,
scan, TX_4X4, vp9_coef_bands);
return c;
}
int vp9_decode_mb_tokens_4x4_uv(VP9D_COMP* const dx,
MACROBLOCKD* const xd,
BOOL_DECODER* const bc) {
int eobtotal = 0, i;
for (i = 16; i < 24; i++)
eobtotal += vp9_decode_coefs_4x4(dx, xd, bc, PLANE_TYPE_UV, i);
return eobtotal;
}
static int vp9_decode_mb_tokens_4x4(VP9D_COMP* const dx,
MACROBLOCKD* const xd,
BOOL_DECODER* const bc) {
int i, eobtotal = 0;
PLANE_TYPE type;
if (xd->mode_info_context->mbmi.mode != B_PRED &&
xd->mode_info_context->mbmi.mode != I8X8_PRED &&
xd->mode_info_context->mbmi.mode != SPLITMV) {
eobtotal += vp9_decode_coefs_4x4(dx, xd, bc, PLANE_TYPE_Y2, 24) - 16;
type = PLANE_TYPE_Y_NO_DC;
} else {
type = PLANE_TYPE_Y_WITH_DC;
}
for (i = 0; i < 16; ++i) {
eobtotal += vp9_decode_coefs_4x4(dx, xd, bc, type, i);
}
return eobtotal + vp9_decode_mb_tokens_4x4_uv(dx, xd, bc);
}
int vp9_decode_mb_tokens(VP9D_COMP* const dx,
MACROBLOCKD* const xd,
BOOL_DECODER* const bc) {
const TX_SIZE tx_size = xd->mode_info_context->mbmi.txfm_size;
int eobtotal;
if (tx_size == TX_16X16) {
eobtotal = vp9_decode_mb_tokens_16x16(dx, xd, bc);
} else if (tx_size == TX_8X8) {
eobtotal = vp9_decode_mb_tokens_8x8(dx, xd, bc);
} else {
assert(tx_size == TX_4X4);
eobtotal = vp9_decode_mb_tokens_4x4(dx, xd, bc);
}
return eobtotal;
}