📄 cabac.c
字号:
}
else if (act_sym<=2)
{
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][act_ctx]);
biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][4]);
csym=act_sym-1;
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
else biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][6]);
}
else if (act_sym<=10)
{
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][act_ctx]);
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][4]);
biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][5]);
csym=(((act_sym-3)>>2)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
else biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][6]);
csym=(((act_sym-3)>>1)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
else biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][6]);
csym=((act_sym-3)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
else biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][6]);
}
else if (act_sym==11 || act_sym==22)
{
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][act_ctx]);
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][4]);
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][5]);
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
if (act_sym==11) biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][6]);
else biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
}
else
{
if (act_sym > 22) act_sym--;
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][act_ctx]);
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][4]);
biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][5]);
csym=(((act_sym-12)>>3)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
else biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][6]);
csym=(((act_sym-12)>>2)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
else biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][6]);
csym=(((act_sym-12)>>1)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
else biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][6]);
csym=((act_sym-12)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->mb_type_contexts[2][6]);
else biari_encode_symbol (eep_dp, 0, &ctx->mb_type_contexts[2][6]);
if (act_sym >=22) act_sym++;
}
}
if(act_sym==mode16x16) // additional info for 16x16 Intra-mode
{
if( mode_sym==25 )
{
biari_encode_symbol_final(eep_dp, 1 );
return;
}
biari_encode_symbol_final(eep_dp, 0 );
act_ctx = 8;
act_sym = mode_sym/12;
biari_encode_symbol(eep_dp, (unsigned char) act_sym, ctx->mb_type_contexts[1] + act_ctx ); // coding of AC/no AC
mode_sym = mode_sym % 12;
act_sym = mode_sym / 4; // coding of cbp: 0,1,2
act_ctx = 9;
if (act_sym==0)
{
biari_encode_symbol(eep_dp, 0, ctx->mb_type_contexts[1] + act_ctx );
}
else
{
biari_encode_symbol(eep_dp, 1, ctx->mb_type_contexts[1] + act_ctx );
if (act_sym==1)
{
biari_encode_symbol(eep_dp, 0, ctx->mb_type_contexts[1] + act_ctx );
}
else
{
biari_encode_symbol(eep_dp, 1, ctx->mb_type_contexts[1] + act_ctx );
}
}
mode_sym = mode_sym % 4; // coding of I pred-mode: 0,1,2,3
act_ctx = 10;
act_sym = mode_sym/2;
biari_encode_symbol(eep_dp, (unsigned char) act_sym, ctx->mb_type_contexts[1] + act_ctx );
act_sym = mode_sym%2;
biari_encode_symbol(eep_dp, (unsigned char) act_sym, ctx->mb_type_contexts[1] + act_ctx );
}
}
}
/*!
***************************************************************************
* \brief
* This function is used to arithmetically encode the 8x8 block
* type info
***************************************************************************
*/
void writeB8_typeInfo2Buffer_CABAC(SyntaxElement *se, EncodingEnvironmentPtr eep_dp)
{
int act_ctx;
int act_sym, csym;
int bframe=(img->type==B_IMG || img->type==BS_IMG);
MotionInfoContexts *ctx = (img->currentSlice)->mot_ctx;
act_sym = se->value1;
act_ctx = 0;
if (!bframe)
{
switch (act_sym)
{
case 0:
biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[0][1]);
break;
case 1:
biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[0][1]);
biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[0][3]);
break;
case 2:
biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[0][1]);
biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[0][3]);
biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[0][4]);
break;
case 3:
biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[0][1]);
biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[0][3]);
biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[0][4]);
break;
}
}
else //===== B-FRAME =====
{
if (act_sym==0)
{
biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][0]);
return;
}
else
{
biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][0]);
act_sym--;
}
if (act_sym<2)
{
biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][1]);
if (act_sym==0) biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][3]);
else biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][3]);
}
else if (act_sym<6)
{
biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][1]);
biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][2]);
csym=(((act_sym-2)>>1)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][3]);
else biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][3]);
csym=((act_sym-2)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][3]);
else biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][3]);
}
else
{
biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][1]);
biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][2]);
csym=(((act_sym-6)>>2)&0x01);
if (csym)
{
biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][3]);
csym=((act_sym-6)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][3]);
else biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][3]);
}
else
{
biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][3]);
csym=(((act_sym-6)>>1)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][3]);
else biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][3]);
csym=((act_sym-6)&0x01);
if (csym) biari_encode_symbol (eep_dp, 1, &ctx->b8_type_contexts[1][3]);
else biari_encode_symbol (eep_dp, 0, &ctx->b8_type_contexts[1][3]);
}
}
}
}
/*!
****************************************************************************
* \brief
* This function is used to arithmetically encode a pair of
* intra prediction modes of a given MB.
****************************************************************************
*/
void writeIntraPredMode2Buffer_CABAC(SyntaxElement *se, EncodingEnvironmentPtr eep_dp)
{
TextureInfoContexts *ctx = img->currentSlice->tex_ctx;
// use_most_probable_mode
if (se->value1 == -1)
biari_encode_symbol(eep_dp, 1, ctx->ipr_contexts);
else
{
biari_encode_symbol(eep_dp, 0, ctx->ipr_contexts);
// remaining_mode_selector
biari_encode_symbol(eep_dp,(signed short)( se->value1 & 0x1 ), ctx->ipr_contexts+1);
biari_encode_symbol(eep_dp,(signed short)((se->value1 & 0x2)>>1), ctx->ipr_contexts+1);
biari_encode_symbol(eep_dp,(signed short)((se->value1 & 0x4)>>2), ctx->ipr_contexts+1);
}
}
/*!
****************************************************************************
* \brief
* This function is used to arithmetically encode the reference
* parameter of a given MB.
****************************************************************************
*/
void writeRefFrame2Buffer_CABAC(SyntaxElement *se, EncodingEnvironmentPtr eep_dp)
{
MotionInfoContexts *ctx = img->currentSlice->mot_ctx;
Macroblock *currMB = &img->mb_data[img->current_mb_nr];
int addctx = 0;
int a, b;
int act_ctx;
int act_sym;
int** refframe_array = ((img->type==B_IMG || img->type==BS_IMG)? fw_refFrArr : refFrArr);
int block_y = img->block_y;
if( input->InterlaceCodingOption >= MB_CODING && mb_adaptive )
{
if( !img->field_mode )
{
refframe_array = ((img->type==B_IMG || img->type==BS_IMG) ? fw_refFrArr_frm : refFrArr_frm);
}
else if ( !img->top_field )
{
refframe_array = ((img->type==B_IMG || img->type==BS_IMG) ? fw_refFrArr_bot : refFrArr_bot);
block_y = ( img->block_y - 4 ) / 2;
}
else
{
refframe_array = ((img->type==B_IMG || img->type==BS_IMG) ? fw_refFrArr_top : refFrArr_top);
block_y = img->block_y / 2;
}
}
if ((img->subblock_y == 0) && ((currMB->mb_available[0][1] == NULL) || (IS_DIRECT(currMB->mb_available[0][1]))))
b = 0;
else
{
/*===== HS: the chosen refframe_array should already contain the scale versions of RefIdx =====
if(( input->InterlaceCodingOption >= MB_CODING && mb_adaptive && (img->subblock_y == 0)
&& (img->field_mode == 0) && (currMB->mb_available[0][1]->mb_field == 1))) //|| (img->field_mode == 1))
b = (refframe_array[block_y+img->subblock_y-1][img->block_x+img->subblock_x] > 1 ? 1 : 0);
else
*/
b = (refframe_array[block_y+img->subblock_y-1][img->block_x+img->subblock_x] > 0 ? 1 : 0);
}
if ((img->subblock_x == 0) && ((currMB->mb_available[1][0] == NULL) || (IS_DIRECT(currMB->mb_available[1][0]))))
a = 0;
else
{
/*===== HS: the chosen refframe_array should already contain the scale versions of RefIdx =====
if(( input->InterlaceCodingOption >= MB_CODING && mb_adaptive && (img->subblock_x == 0)
&& (img->field_mode == 0) && (currMB->mb_available[1][0]->mb_field == 1))) // || (img->field_mode == 1))
a = (refframe_array[block_y+img->subblock_y][img->block_x+img->subblock_x-1] > 1 ? 1 : 0);
else
*/
a = (refframe_array[block_y+img->subblock_y][img->block_x+img->subblock_x-1] > 0 ? 1 : 0);
}
act_ctx = a + 2*b;
se->context = act_ctx; // store context
act_sym = se->value1;
if (act_sym==0)
{
biari_encode_symbol(eep_dp, 0, ctx->ref_no_contexts[addctx] + act_ctx );
}
else
{
biari_encode_symbol(eep_dp, 1, ctx->ref_no_contexts[addctx] + act_ctx);
act_sym--;
act_ctx=4;
unary_bin_encode(eep_dp, act_sym,ctx->ref_no_contexts[addctx]+act_ctx,1);
}
}
/*!
****************************************************************************
* \brief
* This function is used to arithmetically encode the reference
* parameter of a given MB.
****************************************************************************
*/
void writeBwdRefFrame2Buffer_CABAC(SyntaxElement *se, EncodingEnvironmentPtr eep_dp)
{
MotionInfoContexts *ctx = img->currentSlice->mot_ctx;
Macroblock *currMB = &img->mb_data[img->current_mb_nr];
int addctx = 0;
int a, b;
int act_ctx;
int act_sym;
int** refframe_array = ((img->type==B_IMG || img->type==BS_IMG)? bw_refFrArr : refFrArr);
int block_y = img->block_y;
if( input->InterlaceCodingOption >= MB_CODING && mb_adaptive )
{
if( !img->field_mode )
{
refframe_array = ((img->type==B_IMG || img->type==BS_IMG) ? bw_refFrArr_frm : refFrArr_frm);
}
else if ( !img->top_field )
{
refframe_array = ((img->type==B_IMG || img->type==BS_IMG) ? bw_refFrArr_bot : refFrArr_bot);
block_y = ( img->block_y - 4 ) / 2;
}
else
{
refframe_array = ((img->type==B_IMG || img->type==BS_IMG) ? bw_refFrArr_top : refFrArr_top);
block_y = img->block_y / 2;
}
}
if ((img->subblock_y == 0) && ((currMB->mb_available[0][1] == NULL) || (IS_DIRECT(currMB->mb_available[0][1]))))
b = 0;
else
{
/*===== HS: the chosen refframe_array should already contain the scale versions of RefIdx =====
if( input->InterlaceCodingOption >= MB_CODING && mb_adaptive && (img->subblock_y == 0)
&& (img->field_mode == 0) && (currMB->mb_available[0][1]->mb_field == 1))
b = (BWD_IDX(refframe_array[block_y+img->subblock_y-1][img->block_x+img->subblock_x]) > 1 ? 1 : 0);
else
*/
b = (BWD_IDX(refframe_array[block_y+img->subblock_y-1][img->block_x+img->subblock_x]) > 0 ? 1 : 0);
}
if ((img->subblock_x == 0) && ((currMB->mb_available[1][0] == NULL) || (IS_DIRECT(currMB->mb_available[1][0]))))
a = 0;
else
{
/*===== HS: the chosen refframe_array should already contain the scale versions of RefIdx =====
if( input->InterlaceCodingOption >= MB_CODING && mb_adaptive && (img->subblock_x == 0)
&& (img->field_mode == 0) && (currMB->mb_available[1][0]->mb_field == 1))
a = (BWD_IDX(refframe_array[block_y+img->subblock_y][img->block_x+img->subblock_x-1]) > 1 ? 1 : 0);
else
*/
a = (BWD_IDX(refframe_array[block_y+img->subblock_y][img->block_x+img->subblock_x-1]) > 0 ? 1 : 0);
}
act_ctx = a + 2*b;
se->context = act_ctx; // store context
act_sym = se->value1;
if (act_sym==0)
{
biari_encode_symbol(eep_dp, 0, ctx->/*bwd_*/ref_no_contexts[addctx] + act_ctx );
}
else
{
biari_encode_symbol(eep_dp, 1, ctx->/*bwd_*/ref_no_contexts[addctx] + act_ctx);
act_sym--;
act_ctx=4;
unary_bin_encode(eep_dp, act_sym,ctx->/*bwd_*/ref_no_contexts[addctx]+act_ctx,1);
}
}
/*!
****************************************************************************
* \brief
* This function is used to arithmetically encode the motion
* vector data of a given MB.
****************************************************************************
*/
void writeMVD2Buffer_CABAC(SyntaxElement *se, EncodingEnvironmentPtr eep_dp)
{
int i = img->subblock_x;
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -