ref: 20573f0640e181e8363fd1efc52f16569715eb97
dir: /vp8/decoder/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 "vp8/common/blockd.h"
#include "onyxd_int.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
#include "detokenize.h"
#define BOOL_DATA UINT8
#define OCB_X PREV_COEF_CONTEXTS * ENTROPY_NODES
DECLARE_ALIGNED(16, static const unsigned char, coef_bands_x[16]) =
{
0 * OCB_X, 1 * OCB_X, 2 * OCB_X, 3 * OCB_X,
6 * OCB_X, 4 * OCB_X, 5 * OCB_X, 6 * OCB_X,
6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 6 * OCB_X,
6 * OCB_X, 6 * OCB_X, 6 * OCB_X, 7 * OCB_X
};
#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[12] =
{ 129, 130, 133, 140, 153, 177, 196, 230, 243, 254, 254, 0 };
void vp8_reset_mb_tokens_context(MACROBLOCKD *x)
{
/* Clear entropy contexts for Y2 blocks */
if (x->mode_info_context->mbmi.mode != B_PRED &&
x->mode_info_context->mbmi.mode != SPLITMV)
{
vpx_memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
vpx_memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
}
else
{
vpx_memset(x->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1);
vpx_memset(x->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES)-1);
}
}
DECLARE_ALIGNED(16, extern const unsigned char, vp8_norm[256]);
#define FILL \
if(count < 0) \
VP8DX_BOOL_DECODER_FILL(count, value, bufptr, bufend);
#define NORMALIZE \
/*if(range < 0x80)*/ \
{ \
shift = vp8_norm[range]; \
range <<= shift; \
value <<= shift; \
count -= shift; \
}
#define DECODE_AND_APPLYSIGN(value_to_sign) \
split = (range + 1) >> 1; \
bigsplit = (VP8_BD_VALUE)split << (VP8_BD_VALUE_SIZE - 8); \
FILL \
if ( value < bigsplit ) \
{ \
range = split; \
v= value_to_sign; \
} \
else \
{ \
range = range-split; \
value = value-bigsplit; \
v = -value_to_sign; \
} \
range +=range; \
value +=value; \
count--;
#define DECODE_AND_BRANCH_IF_ZERO(probability,branch) \
{ \
split = 1 + ((( probability*(range-1) ) )>> 8); \
bigsplit = (VP8_BD_VALUE)split << (VP8_BD_VALUE_SIZE - 8); \
FILL \
if ( value < bigsplit ) \
{ \
range = split; \
NORMALIZE \
goto branch; \
} \
value -= bigsplit; \
range = range - split; \
NORMALIZE \
}
#define DECODE_AND_LOOP_IF_ZERO(probability,branch) \
{ \
split = 1 + ((( probability*(range-1) ) ) >> 8); \
bigsplit = (VP8_BD_VALUE)split << (VP8_BD_VALUE_SIZE - 8); \
FILL \
if ( value < bigsplit ) \
{ \
range = split; \
NORMALIZE \
Prob = coef_probs; \
if(c<15) {\
++c; \
Prob += coef_bands_x[c]; \
goto branch; \
} goto BLOCK_FINISHED; /*for malformed input */\
} \
value -= bigsplit; \
range = range - split; \
NORMALIZE \
}
#define DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(val) \
DECODE_AND_APPLYSIGN(val) \
Prob = coef_probs + (ENTROPY_NODES*2); \
if(c < 15){\
qcoeff_ptr [ scan[c] ] = (INT16) v; \
++c; \
goto DO_WHILE; }\
qcoeff_ptr [ 15 ] = (INT16) v; \
goto BLOCK_FINISHED;
#define DECODE_EXTRABIT_AND_ADJUST_VAL(prob, bits_count)\
split = 1 + (((range-1) * prob) >> 8); \
bigsplit = (VP8_BD_VALUE)split << (VP8_BD_VALUE_SIZE - 8); \
FILL \
if(value >= bigsplit)\
{\
range = range-split;\
value = value-bigsplit;\
val += ((UINT16)1<<bits_count);\
}\
else\
{\
range = split;\
}\
NORMALIZE
int vp8_decode_mb_tokens(VP8D_COMP *dx, MACROBLOCKD *x)
{
ENTROPY_CONTEXT *A = (ENTROPY_CONTEXT *)x->above_context;
ENTROPY_CONTEXT *L = (ENTROPY_CONTEXT *)x->left_context;
const FRAME_CONTEXT * const fc = &dx->common.fc;
BOOL_DECODER *bc = x->current_bc;
char *eobs = x->eobs;
ENTROPY_CONTEXT *a;
ENTROPY_CONTEXT *l;
int i;
int eobtotal = 0;
register int count;
const BOOL_DATA *bufptr;
const BOOL_DATA *bufend;
register unsigned int range;
VP8_BD_VALUE value;
const int *scan;
register unsigned int shift;
unsigned int split;
VP8_BD_VALUE bigsplit;
short *qcoeff_ptr;
const vp8_prob *coef_probs;
int stop;
int val, bits_count;
int c;
int v;
const vp8_prob *Prob;
int start_coeff;
i = 0;
stop = 16;
scan = vp8_default_zig_zag1d;
qcoeff_ptr = &x->qcoeff[0];
coef_probs = fc->coef_probs [3] [ 0 ] [0];
if (x->mode_info_context->mbmi.mode != B_PRED &&
x->mode_info_context->mbmi.mode != SPLITMV)
{
i = 24;
stop = 24;
qcoeff_ptr += 24*16;
eobtotal -= 16;
coef_probs = fc->coef_probs [1] [ 0 ] [0];
}
bufend = bc->user_buffer_end;
bufptr = bc->user_buffer;
value = bc->value;
count = bc->count;
range = bc->range;
start_coeff = 0;
BLOCK_LOOP:
a = A + vp8_block2above[i];
l = L + vp8_block2left[i];
c = start_coeff;
VP8_COMBINEENTROPYCONTEXTS(v, *a, *l);
Prob = coef_probs;
Prob += v * ENTROPY_NODES;
*a = *l = 0;
DO_WHILE:
Prob += coef_bands_x[c];
DECODE_AND_BRANCH_IF_ZERO(Prob[EOB_CONTEXT_NODE], BLOCK_FINISHED);
*a = *l = 1;
CHECK_0_:
DECODE_AND_LOOP_IF_ZERO(Prob[ZERO_CONTEXT_NODE], CHECK_0_);
DECODE_AND_BRANCH_IF_ZERO(Prob[ONE_CONTEXT_NODE], ONE_CONTEXT_NODE_0_);
DECODE_AND_BRANCH_IF_ZERO(Prob[LOW_VAL_CONTEXT_NODE],
LOW_VAL_CONTEXT_NODE_0_);
DECODE_AND_BRANCH_IF_ZERO(Prob[HIGH_LOW_CONTEXT_NODE],
HIGH_LOW_CONTEXT_NODE_0_);
DECODE_AND_BRANCH_IF_ZERO(Prob[CAT_THREEFOUR_CONTEXT_NODE],
CAT_THREEFOUR_CONTEXT_NODE_0_);
DECODE_AND_BRANCH_IF_ZERO(Prob[CAT_FIVE_CONTEXT_NODE],
CAT_FIVE_CONTEXT_NODE_0_);
val = CAT6_MIN_VAL;
bits_count = 10;
do
{
DECODE_EXTRABIT_AND_ADJUST_VAL(cat6_prob[bits_count], bits_count);
bits_count -- ;
}
while (bits_count >= 0);
DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(val);
CAT_FIVE_CONTEXT_NODE_0_:
val = CAT5_MIN_VAL;
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT5_PROB4, 4);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT5_PROB3, 3);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT5_PROB2, 2);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT5_PROB1, 1);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT5_PROB0, 0);
DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(val);
CAT_THREEFOUR_CONTEXT_NODE_0_:
DECODE_AND_BRANCH_IF_ZERO(Prob[CAT_THREE_CONTEXT_NODE],
CAT_THREE_CONTEXT_NODE_0_);
val = CAT4_MIN_VAL;
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT4_PROB3, 3);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT4_PROB2, 2);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT4_PROB1, 1);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT4_PROB0, 0);
DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(val);
CAT_THREE_CONTEXT_NODE_0_:
val = CAT3_MIN_VAL;
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT3_PROB2, 2);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT3_PROB1, 1);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT3_PROB0, 0);
DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(val);
HIGH_LOW_CONTEXT_NODE_0_:
DECODE_AND_BRANCH_IF_ZERO(Prob[CAT_ONE_CONTEXT_NODE],
CAT_ONE_CONTEXT_NODE_0_);
val = CAT2_MIN_VAL;
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT2_PROB1, 1);
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT2_PROB0, 0);
DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(val);
CAT_ONE_CONTEXT_NODE_0_:
val = CAT1_MIN_VAL;
DECODE_EXTRABIT_AND_ADJUST_VAL(CAT1_PROB0, 0);
DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(val);
LOW_VAL_CONTEXT_NODE_0_:
DECODE_AND_BRANCH_IF_ZERO(Prob[TWO_CONTEXT_NODE], TWO_CONTEXT_NODE_0_);
DECODE_AND_BRANCH_IF_ZERO(Prob[THREE_CONTEXT_NODE], THREE_CONTEXT_NODE_0_);
DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(4);
THREE_CONTEXT_NODE_0_:
DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(3);
TWO_CONTEXT_NODE_0_:
DECODE_SIGN_WRITE_COEFF_AND_CHECK_EXIT(2);
ONE_CONTEXT_NODE_0_:
DECODE_AND_APPLYSIGN(1);
Prob = coef_probs + ENTROPY_NODES;
if (c < 15)
{
qcoeff_ptr [ scan[c] ] = (INT16) v;
++c;
goto DO_WHILE;
}
qcoeff_ptr [ 15 ] = (INT16) v;
BLOCK_FINISHED:
eobs[i] = c;
eobtotal += c;
qcoeff_ptr += 16;
i++;
if (i < stop)
goto BLOCK_LOOP;
if (i == 25)
{
start_coeff = 1;
i = 0;
stop = 16;
coef_probs = fc->coef_probs [0] [ 0 ] [0];
qcoeff_ptr -= (24*16 + 16);
goto BLOCK_LOOP;
}
if (i == 16)
{
start_coeff = 0;
coef_probs = fc->coef_probs [2] [ 0 ] [0];
stop = 24;
goto BLOCK_LOOP;
}
FILL
bc->user_buffer = bufptr;
bc->value = value;
bc->count = count;
bc->range = range;
return eobtotal;
}