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h264_slice_data.h
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h264_slice_data.h
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/*
* h264bitstream - a library for reading and writing H.264 video
* Copyright (C) 2012 Alex Izvorski
*
* Written by Alex Izvorski <[email protected]> and Alex Giladi <[email protected]>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
typedef struct
{
int mb_type;
int sub_mb_type[4]; // [ mbPartIdx ]
// pcm mb only
int pcm_sample_luma[256];
int pcm_sample_chroma[512];
int transform_size_8x8_flag;
int mb_qp_delta;
int mb_field_decoding_flag;
int mb_skip_flag;
// intra mb only
int prev_intra4x4_pred_mode_flag[16]; // [ luma4x4BlkIdx ]
int rem_intra4x4_pred_mode[16]; // [ luma4x4BlkIdx ]
int prev_intra8x8_pred_mode_flag[4]; // [ luma8x8BlkIdx ]
int rem_intra8x8_pred_mode[4]; // [ luma8x8BlkIdx ]
int intra_chroma_pred_mode;
// inter mb only
int ref_idx_l0[4]; // [ mbPartIdx ]
int ref_idx_l1[4]; // [ mbPartIdx ]
int mvd_l0[4][4][2]; // [ mbPartIdx ][ subMbPartIdx ][ compIdx ]
int mvd_l1[4][4][2]; // [ mbPartIdx ][ subMbPartIdx ][ compIdx ]
// residuals
int coded_block_pattern;
int Intra16x16DCLevel[16]; // [ 16 ]
int Intra16x16ACLevel[16][15]; // [ i8x8 * 4 + i4x4 ][ 15 ]
int LumaLevel[16][16]; // [ i8x8 * 4 + i4x4 ][ 16 ]
int LumaLevel8x8[4][64]; // [ i8x8 ][ 64 ]
int ChromaDCLevel[2][16]; // [ iCbCr ][ 4 * NumC8x8 ]
int ChromaACLevel[2][16][15]; // [ iCbCr ][ i8x8*4+i4x4 ][ 15 ]
} macroblock_t;
typedef struct
{
macroblock_t* mbs;
} slice_t;
/****** bitstream functions - not already implemented ******/
uint32_t bs_read_te(bs_t* b);
void bs_write_te(bs_t* b, uint32_t v);
uint32_t bs_read_me(bs_t* b);
void bs_write_me(bs_t* b, uint32_t v);
// CABAC
// 9.3 CABAC parsing process for slice data
// NOTE: these functions will need more arguments, since how they work depends on *what* is being encoded/decoded
// for now, just a placeholder for places that we will need to call this from
uint32_t bs_read_ae(bs_t* b);
void bs_write_ae(bs_t* b, uint32_t v);
// CALVC
// 9.2 CAVLC parsing process for transform coefficient levels
uint32_t bs_read_ce(bs_t* b);
void bs_write_ce(bs_t* b, uint32_t v);
/****** dummy defines *****/
#define cabac 0
// values for mb_type
#define I_PCM 0
#define I_NxN 0
#define P_8x8ref0 0
// values for MbPartPredMode (and SubMbPredMode)
#define Intra_4x4 0
#define Intra_8x8 0
#define Intra_16x16 0
#define Direct 0
#define Pred_L0 0
#define Pred_L1 0
// values for sub_mb_type
#define B_Direct_8x8 0
#define B_Direct_16x16 0
#define MbWidthC 8
#define MbHeightC 8
#define SubWidthC 2
#define SubHeightC 2
int NextMbAddress( int CurrMbAddr );
int MbPartPredMode( int mb_type, int mbPartIdx );
int NumMbPart( int mb_type );
int NumSubMbPart( int sub_mb_type );
int SubMbPredMode( int sub_mb_type );
int TotalCoeff( int x );
int TrailingOnes( int x );
int Min( int a, int b );
int Abs( int x );
#define CodedBlockPatternLuma (mb->coded_block_pattern % 16)
#define CodedBlockPatternChroma (mb->coded_block_pattern / 16)
//7.4.3 Slice header semantics, Eq 7-23
#define MbaffFrameFlag ( h->sps->mb_adaptive_frame_field_flag && !h->sh->field_pic_flag )