📄 cabac.c
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///*****************************************************************************
//*
//* T264 AVC CODEC
//*
//* Copyright(C) 2004-2005 joylife <joylife_video@yahoo.com.cn>
//* 2004-2005 tricro <tricro@hotmail.com>
//*
//* This program is free software ; you can redistribute it and/or modify
//* it under the terms of the GNU General Public License as published by
//* the Free Software Foundation ; either version 2 of the License, or
//* (at your option) any later version.
//*
//* This program is distributed in the hope that it will be useful,
//* but WITHOUT ANY WARRANTY ; without even the implied warranty of
//* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//* GNU General Public License for more details.
//*
//* You should have received a copy of the GNU General Public License
//* along with this program ; if not, write to the Free Software
//* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//*
//****************************************************************************/
//
///*****************************************************************************
// * cabac.c: h264 encoder library
// *****************************************************************************
// * Copyright (C) 2003 Laurent Aimar
// *
// * Authors: Laurent Aimar <fenrir@via.ecp.fr>
// *
// * This program is free software; you can redistribute it and/or modify
// * it under the terms of the GNU General Public License as published by
// * the Free Software Foundation; either version 2 of the License, or
// * (at your option) any later version.
// *
// * This program is distributed in the hope that it will be useful,
// * but WITHOUT ANY WARRANTY; without even the implied warranty of
// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// * GNU General Public License for more details.
// *
// * You should have received a copy of the GNU General Public License
// * along with this program; if not, write to the Free Software
// * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
// *****************************************************************************/
//
///*Note: the CABAC routine is currently referenced from x264 temporarily, with adaptation to
// *the data structure of T264. It should be modified further in the near future.
// *It's can support B slice, but only with MB mode P16x16, P16x8, P8x16, Direct16x16, B_SKIP
// *ie., B8x8 is not support now
//*/
//
//#include <stdlib.h>
//#include <stdio.h>
//#include <string.h>
//#include <assert.h>
//#include "T264.h"
//#include "cabac_engine.h"
//#include "inter.h"
///* From ffmpeg
//*/
//#define T264_SCAN8_SIZE (6*8)
//#define T264_SCAN8_0 (4+1*8)
//
//static const int T264_scan8[16+2*4] =
//{
// /* Luma */
// VEC_LUMA + 0, VEC_LUMA + 1, VEC_LUMA + 1*8 + 0, VEC_LUMA + 1*8 + 1,
// VEC_LUMA + 2, VEC_LUMA + 3, VEC_LUMA + 1*8 + 2, VEC_LUMA + 1*8 + 3,
// VEC_LUMA + 2*8 + 0, VEC_LUMA + 2*8 + 1, VEC_LUMA + 3*8 + 0, VEC_LUMA + 3*8 + 1,
// VEC_LUMA + 2*8 + 2, VEC_LUMA + 2*8 + 3, VEC_LUMA + 3*8 + 2, VEC_LUMA + 3*8 + 3,
//
// /* Cb */
// NNZ_CHROMA0 + 0, NNZ_CHROMA0 + 1,
// NNZ_CHROMA0 + 1*8 + 0, NNZ_CHROMA0 + 1*8 + 1,
//
// /* Cr */
// NNZ_CHROMA1 + 0, NNZ_CHROMA1 + 1,
// NNZ_CHROMA1 + 1*8 + 0, NNZ_CHROMA1 + 1*8 + 1,
//};
//static const uint8_t block_idx_xy[4][4] =
//{
// { 0, 2, 8, 10},
// { 1, 3, 9, 11},
// { 4, 6, 12, 14},
// { 5, 7, 13, 15}
//};
//
//#define IS_INTRA(mode) (mode == I_4x4 || mode == I_16x16)
//#define IS_SKIP(type) ( (type) == P_SKIP || (type) == B_SKIP )
//enum {
// INTRA_4x4 = 0,
// INTRA_16x16 = 1,
// INTRA_PCM = 2,
//
// P_L0 = 3,
// P_8x81 = 4,
// P_SKIP1 = 5,
//
// B_DIRECT = 6,
// B_L0_L0 = 7,
// B_L0_L1 = 8,
// B_L0_BI = 9,
// B_L1_L0 = 10,
// B_L1_L1 = 11,
// B_L1_BI = 12,
// B_BI_L0 = 13,
// B_BI_L1 = 14,
// B_BI_BI = 15,
// B_8x81 = 16,
// B_SKIP1 = 17,
//};
//
//static const int T264_mb_partition_listX_table[][2] =
//{
// {0, 0}, //B_DIRECT_8x8 = 100,
// {1, 0}, //B_L0_8x8,
// {0, 1}, //B_L1_8x8,
// {1, 1}, //B_Bi_8x8,
// {1, 0}, //B_L0_8x4,
// {1, 0}, //B_L0_4x8,
// {0, 1}, //B_L1_8x4,
// {0, 1}, //B_L1_4x8,
// {1, 1}, //B_Bi_8x4,
// {1, 1}, //B_Bi_4x8,
// {1, 0}, //B_L0_4x4,
// {0, 1}, //B_L1_4x4,
// {1, 1} //B_Bi_4x4
//};
//
//static const int T264_mb_type_list0_table[18][2] =
//{
// {0,0}, {0,0}, {0,0}, /* INTRA */
// {1,1}, /* P_L0 */
// {0,0}, /* P_8x8 */
// {1,1}, /* P_SKIP */
// {0,0}, /* B_DIRECT */
// {1,1}, {1,0}, {1,1}, /* B_L0_* */
// {0,1}, {0,0}, {0,1}, /* B_L1_* */
// {1,1}, {1,0}, {1,1}, /* B_BI_* */
// {0,0}, /* B_8x8 */
// {0,0} /* B_SKIP */
//};
//static const int T264_mb_type_list1_table[18][2] =
//{
// {0,0}, {0,0}, {0,0}, /* INTRA */
// {0,0}, /* P_L0 */
// {0,0}, /* P_8x8 */
// {0,0}, /* P_SKIP */
// {0,0}, /* B_DIRECT */
// {0,0}, {0,1}, {0,1}, /* B_L0_* */
// {1,0}, {1,1}, {1,1}, /* B_L1_* */
// {1,0}, {1,1}, {1,1}, /* B_BI_* */
// {0,0}, /* B_8x8 */
// {0,0} /* B_SKIP */
//};
//
//static void T264_cabac_mb_type( T264_t *t )
//{
// T264_mb_context_t *mb_ctxs = &(t->rec->mb[0]);
// int32_t mb_mode = t->mb.mb_mode;
//
// if( t->slice_type == SLICE_I )
// {
// int ctx = 0;
// if( t->mb.mb_x > 0 && mb_ctxs[t->mb.mb_xy-1].mb_mode != I_4x4 )
// {
// ctx++;
// }
// if( t->mb.mb_y > 0 && mb_ctxs[t->mb.mb_xy - t->mb_stride].mb_mode != I_4x4 )
// {
// ctx++;
// }
//
// if( mb_mode == I_4x4 )
// {
// T264_cabac_encode_decision( &t->cabac, 3 + ctx, 0 );
// }
// else if(mb_mode == I_16x16) /* I_16x16 */
// {
// T264_cabac_encode_decision( &t->cabac, 3 + ctx, 1 );
// T264_cabac_encode_terminal( &t->cabac, 0 );
//
// T264_cabac_encode_decision( &t->cabac, 3 + 3, ( t->mb.cbp_y == 0 ? 0 : 1 ));
// if( t->mb.cbp_c == 0 )
// {
// T264_cabac_encode_decision( &t->cabac, 3 + 4, 0 );
// }
// else
// {
// T264_cabac_encode_decision( &t->cabac, 3 + 4, 1 );
// T264_cabac_encode_decision( &t->cabac, 3 + 5, ( t->mb.cbp_c == 1 ? 0 : 1 ) );
// }
// T264_cabac_encode_decision( &t->cabac, 3 + 6, ( (t->mb.mode_i16x16 / 2) ? 1 : 0 ));
// T264_cabac_encode_decision( &t->cabac, 3 + 7, ( (t->mb.mode_i16x16 % 2) ? 1 : 0 ));
// }
// else /* I_PCM */
// {
// T264_cabac_encode_decision( &t->cabac, 3 + ctx, 1 );
// T264_cabac_encode_terminal( &t->cabac, 1 );
// }
// }
// else if( t->slice_type == SLICE_P )
// {
// /* prefix: 14, suffix: 17 */
// if( mb_mode == P_MODE )
// {
// if( t->mb.mb_part == MB_16x16 )
// {
// T264_cabac_encode_decision( &t->cabac, 14, 0 );
// T264_cabac_encode_decision( &t->cabac, 15, 0 );
// T264_cabac_encode_decision( &t->cabac, 16, 0 );
// }
// else if( t->mb.mb_part == MB_16x8 )
// {
// T264_cabac_encode_decision( &t->cabac, 14, 0 );
// T264_cabac_encode_decision( &t->cabac, 15, 1 );
// T264_cabac_encode_decision( &t->cabac, 17, 1 );
// }
// else if( t->mb.mb_part == MB_8x16 )
// {
// T264_cabac_encode_decision( &t->cabac, 14, 0 );
// T264_cabac_encode_decision( &t->cabac, 15, 1 );
// T264_cabac_encode_decision( &t->cabac, 17, 0 );
// }
// else /* P8x8 mode */
// {
// T264_cabac_encode_decision( &t->cabac, 14, 0 );
// T264_cabac_encode_decision( &t->cabac, 15, 0 );
// T264_cabac_encode_decision( &t->cabac, 16, 1 );
// }
// }
// else if( mb_mode == I_4x4 )
// {
// /* prefix */
// T264_cabac_encode_decision( &t->cabac, 14, 1 );
//
// T264_cabac_encode_decision( &t->cabac, 17, 0 );
// }
// else if(mb_mode == I_16x16) /* intra 16x16 */
// {
// /* prefix */
// T264_cabac_encode_decision( &t->cabac, 14, 1 );
//
// /* suffix */
// T264_cabac_encode_decision( &t->cabac, 17, 1 );
// T264_cabac_encode_terminal( &t->cabac, 0 ); /*ctxIdx == 276 */
//
// T264_cabac_encode_decision( &t->cabac, 17+1, ( t->mb.cbp_y == 0 ? 0 : 1 ));
// if( t->mb.cbp_c == 0 )
// {
// T264_cabac_encode_decision( &t->cabac, 17+2, 0 );
// }
// else
// {
// T264_cabac_encode_decision( &t->cabac, 17+2, 1 );
// T264_cabac_encode_decision( &t->cabac, 17+2, ( t->mb.cbp_c == 1 ? 0 : 1 ) );
// }
// T264_cabac_encode_decision( &t->cabac, 17+3, ( (t->mb.mode_i16x16 / 2) ? 1 : 0 ));
// T264_cabac_encode_decision( &t->cabac, 17+3, ( (t->mb.mode_i16x16 % 2) ? 1 : 0 ));
// }
// else /* I_PCM */
// {
// /* prefix */
// T264_cabac_encode_decision( &t->cabac, 14, 1 );
//
// T264_cabac_encode_decision( &t->cabac, 17, 1 );
// T264_cabac_encode_terminal( &t->cabac, 1 ); /*ctxIdx == 276 */
// }
// }
// else if( t->slice_type == SLICE_B )
// {
// int ctx = 0;
// if( t->mb.mb_x > 0 && mb_ctxs[t->mb.mb_xy-1].mb_mode != B_SKIP && !mb_ctxs[t->mb.mb_xy-1].is_copy )
// {
// ctx++;
// }
// if( t->mb.mb_y > 0 && mb_ctxs[t->mb.mb_xy - t->mb_stride].mb_mode != B_SKIP && ! mb_ctxs[t->mb.mb_xy - t->mb_stride].is_copy)
// {
// ctx++;
// }
//
// if( t->mb.is_copy)
// {
// T264_cabac_encode_decision( &t->cabac, 27+ctx, 0 );
// }
// else if( t->mb.mb_part == MB_8x8 )
// {
// T264_cabac_encode_decision( &t->cabac, 27+ctx, 1 );
// T264_cabac_encode_decision( &t->cabac, 27+3, 1 );
// T264_cabac_encode_decision( &t->cabac, 27+4, 1 );
//
// T264_cabac_encode_decision( &t->cabac, 27+5, 1 );
// T264_cabac_encode_decision( &t->cabac, 27+5, 1 );
// T264_cabac_encode_decision( &t->cabac, 27+5, 1 );
// }
// else if( IS_INTRA( mb_mode ) )
// {
// /* prefix */
// T264_cabac_encode_decision( &t->cabac, 27+ctx, 1 );
// T264_cabac_encode_decision( &t->cabac, 27+3, 1 );
// T264_cabac_encode_decision( &t->cabac, 27+4, 1 );
//
// T264_cabac_encode_decision( &t->cabac, 27+5, 1 );
// T264_cabac_encode_decision( &t->cabac, 27+5, 0 );
// T264_cabac_encode_decision( &t->cabac, 27+5, 1 );
//
// /* Suffix */
// if( mb_mode == I_4x4 )
// {
// T264_cabac_encode_decision( &t->cabac, 32, 0 );
// }
// else if(mb_mode == I_16x16)
// {
// T264_cabac_encode_decision( &t->cabac, 32, 1 );
// T264_cabac_encode_terminal( &t->cabac, 0 );
//
// /* TODO */
// T264_cabac_encode_decision( &t->cabac, 32+1, ( t->mb.cbp_y == 0 ? 0 : 1 ));
// if( t->mb.cbp_c == 0 )
// {
// T264_cabac_encode_decision( &t->cabac, 32+2, 0 );
// }
// else
// {
// T264_cabac_encode_decision( &t->cabac, 32+2, 1 );
// T264_cabac_encode_decision( &t->cabac, 32+2, ( t->mb.cbp_c == 1 ? 0 : 1 ) );
// }
// T264_cabac_encode_decision( &t->cabac, 32+3, ( (t->mb.mode_i16x16 / 2) ? 1 : 0 ));
// T264_cabac_encode_decision( &t->cabac, 32+3, ( (t->mb.mode_i16x16 % 2) ? 1 : 0 ));
// }
// else /* I_PCM */
// {
// T264_cabac_encode_decision( &t->cabac, 32, 1 );
// T264_cabac_encode_terminal( &t->cabac, 1 );
// }
//
// }
// else
// {
// static const int i_mb_len[21] =
// {
// 3, 6, 6, /* L0 L0 */
// 3, 6, 6, /* L1 L1 */
// 6, 7, 7, /* BI BI */
//
// 6, 6, /* L0 L1 */
// 6, 6, /* L1 L0 */
// 7, 7, /* L0 BI */
// 7, 7, /* L1 BI */
// 7, 7, /* BI L0 */
// 7, 7, /* BI L1 */
// };
// static const int i_mb_bits[21][7] =
// {
// { 1, 0, 0, }, { 1, 1, 0, 0, 0, 1, }, { 1, 1, 0, 0, 1, 0, }, /* L0 L0 */
// { 1, 0, 1, }, { 1, 1, 0, 0, 1, 1, }, { 1, 1, 0, 1, 0, 0, }, /* L1 L1 */
// { 1, 1, 0, 0, 0, 0 ,}, { 1, 1, 1, 1, 0, 0 , 0 }, { 1, 1, 1, 1, 0, 0 , 1 },/* BI BI */
//
// { 1, 1, 0, 1, 0, 1, }, { 1, 1, 0, 1, 1, 0, }, /* L0 L1 */
// { 1, 1, 0, 1, 1, 1, }, { 1, 1, 1, 1, 1, 0, }, /* L1 L0 */
// { 1, 1, 1, 0, 0, 0, 0 }, { 1, 1, 1, 0, 0, 0, 1 }, /* L0 BI */
// { 1, 1, 1, 0, 0, 1, 0 }, { 1, 1, 1, 0, 0, 1, 1 }, /* L1 BI */
// { 1, 1, 1, 0, 1, 0, 0 }, { 1, 1, 1, 0, 1, 0, 1 }, /* BI L0 */
// { 1, 1, 1, 0, 1, 1, 0 }, { 1, 1, 1, 0, 1, 1, 1 } /* BI L1 */
// };
//
// const int i_partition = t->mb.mb_part;
// int idx = 0;
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