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268 lines
13 KiB
C
268 lines
13 KiB
C
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/******************************************************************************
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*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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/*!
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***************************************************************************
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* \file ih264d_cabac.h
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*
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* \brief
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* This file contains declarations of Binary decoding routines and tables.
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*
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* \date
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* 04/02/2003
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*
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* \author NS
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***************************************************************************
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*/
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#ifndef _IH264D_CABAC_H_
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#define _IH264D_CABAC_H_
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#include "ih264_typedefs.h"
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#include "ih264_macros.h"
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#include "ih264_platform_macros.h"
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#include "ih264d_bitstrm.h"
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#include "ih264d_defs.h"
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#define B_BITS 10
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#define HALF (1 << (B_BITS-1))
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#define QUARTER (1 << (B_BITS-2))
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#define CTXT_UNUSED {0,64}
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#define NUM_MB_SKIP_CTXT 6
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#define NUM_MB_TYPE_CTXT 9
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#define NUM_SUBMB_TYPE_CTXT 7
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#define NUM_REF_IDX_CTXT 6
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#define NUM_MB_QP_DELTA 4
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#define NUM_PRED_MODE 6
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#define NUM_MB_FIELD 3
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#define NUM_CBP 12
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#define NUM_CTX_MVD 14
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/* Residual block cabac context parameters */
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#define NUM_CTX_CAT 6
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#define NUM_LUMA_CTX_CAT 3
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#define NUM_CTX_CODED_BLOCK 4
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/* Luma CtxSigCoeff + CtxLastCoeff = 15 + 15 = 30 */
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#define NUM_LUMA_CTX_SIG_COEF 30
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/* Chroma DC CtxSigCoeff + CtxLastCoeff = 3 + 3 = 6 */
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#define NUM_CTX_CHROMA_DC_SIG_COEF 6
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/* Chroma AC CtxSigCoeff + CtxLastCoeff = 14 + 14 = 28 */
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#define NUM_CTX_CHROMA_AC_SIG_COEF 28
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#define NUM_CTX_ABS_LEVEL 10
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#define LUMA_DC_CTXCAT 0
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#define LUMA_AC_CTXCAT 1
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#define LUMA_4X4_CTXCAT 2
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#define CHROMA_DC_CTXCAT 3
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#define CHROMA_AC_CTXCAT 4
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#define LUMA_8X8_CTXCAT 5
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/*****************************************************************************/
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/* Constant Macros */
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/*****************************************************************************/
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#define NUM_CABAC_CTXTS 460
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#define QP_RANGE 52
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#define NUM_CAB_INIT_IDC_PLUS_ONE 4
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#define LAST_COEFF_CTXT_MINUS_SIG_COEFF_CTXT 61
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#define LAST_COEFF_CTXT_MINUS_SIG_COEFF_CTXT_8X8 15
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/*bits 0 to 5 :state
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bit 6:mps*/
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typedef struct
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{
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UWORD8 u1_mps_state; /* state number */
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} bin_ctxt_model_t;
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typedef struct
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{
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/* Neighbour availability Variables needed to get CtxtInc, for CABAC */
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UWORD8 u1_mb_type; /** macroblock type: I/P/B/SI/SP */
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UWORD8 u1_cbp; /** Coded Block Pattern */
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UWORD8 u1_intra_chroma_pred_mode;
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/*************************************************************************/
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/* Arrangnment of DC CSBP */
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/* bits: b7 b6 b5 b4 b3 b2 b1 b0 */
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/* CSBP: x x x x x Vdc Udc Ydc */
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/*************************************************************************/
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UWORD8 u1_yuv_dc_csbp;
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WORD8 i1_ref_idx[4];
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UWORD8 u1_mv[4][4];
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UWORD8 u1_transform8x8_ctxt;
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} ctxt_inc_mb_info_t;
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#define ONE_RIGHT_SHIFTED_BY_8 1<<8
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#define ONE_RIGHT_SHIFTED_BY_9 1<<9
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#define ONE_RIGHT_SHIFTED_BY_14 1<<14
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typedef struct
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{
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UWORD32 u4_code_int_range;
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UWORD32 u4_code_int_val_ofst;
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const void *cabac_table;
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void * pv_codec_handle; /* For Error Handling */
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} decoding_envirnoment_t;
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WORD32 ih264d_init_cabac_dec_envirnoment(decoding_envirnoment_t * ps_cab_env,
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dec_bit_stream_t *ps_bitstrm);
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UWORD32 ih264d_decode_bin(UWORD32 u4_ctx_inc,
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bin_ctxt_model_t *ps_bin_ctxt,
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dec_bit_stream_t *ps_bitstrm,
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decoding_envirnoment_t *ps_cab_env);
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UWORD8 ih264d_decode_terminate(decoding_envirnoment_t * ps_cab_env,
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dec_bit_stream_t * ps_bitstrm);
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UWORD32 ih264d_decode_bins_tunary(UWORD8 u1_max_bins,
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UWORD32 u4_ctx_inc,
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bin_ctxt_model_t *ps_src_bin_ctxt,
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dec_bit_stream_t *ps_bitstrm,
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decoding_envirnoment_t *ps_cab_env);
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UWORD32 ih264d_decode_bins(UWORD8 u1_max_bins,
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UWORD32 u4_ctx_inc,
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bin_ctxt_model_t *ps_src_bin_ctxt,
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dec_bit_stream_t *ps_bitstrm,
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decoding_envirnoment_t *ps_cab_env);
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UWORD32 ih264d_decode_bins_unary(UWORD8 u1_max_bins,
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UWORD32 u4_ctx_inc,
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bin_ctxt_model_t *ps_src_bin_ctxt,
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dec_bit_stream_t *ps_bitstrm,
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decoding_envirnoment_t *ps_cab_env);
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UWORD32 ih264d_decode_bypass_bins_unary(decoding_envirnoment_t *ps_cab_env,
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dec_bit_stream_t *ps_bitstrm);
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UWORD32 ih264d_decode_bypass_bins(decoding_envirnoment_t *ps_cab_env,
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UWORD8 u1_max_bins,
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dec_bit_stream_t *ps_bitstrm);
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/*****************************************************************************/
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/* Function Macros */
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/*****************************************************************************/
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/*****************************************************************************/
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/* Defining a macro for renormalization*/
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/*****************************************************************************/
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/*we renormalize every time the number bits(which are read ahead of time) we have
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consumed in the u4_ofst exceeds 23*/
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#define RENORM_RANGE_OFFSET(u4_codeIntRange_m,u4_codeIntValOffset_m,u4_offset_m,pu4_buffer_m) \
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{ \
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UWORD32 read_bits_m,u4_clz_m ; \
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u4_clz_m = CLZ(u4_codeIntRange_m); \
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NEXTBITS(read_bits_m,(u4_offset_m+23),pu4_buffer_m,u4_clz_m) \
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FLUSHBITS(u4_offset_m,(u4_clz_m)) \
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u4_codeIntRange_m = u4_codeIntRange_m << u4_clz_m; \
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u4_codeIntValOffset_m = (u4_codeIntValOffset_m << u4_clz_m) | read_bits_m; \
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}
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/*****************************************************************************/
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/* Defining a macro for checking if the symbol is MPS*/
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/*****************************************************************************/
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#define CHECK_IF_LPS(u4_codeIntRange_m,u4_codeIntValOffset_m,u4_symbol_m, \
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u4_codeIntRangeLPS_m,u1_mps_state_m,table_lookup_m) \
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{ \
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if(u4_codeIntValOffset_m >= u4_codeIntRange_m) \
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{ \
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u4_symbol_m = 1 - u4_symbol_m; \
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u4_codeIntValOffset_m -= u4_codeIntRange_m; \
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u4_codeIntRange_m = u4_codeIntRangeLPS_m; \
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u1_mps_state_m = (table_lookup_m >> 15) & 0x7F; \
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} \
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}
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/*!
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**************************************************************************
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* \if Function name : DECODE_ONE_BIN_MACRO \endif
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*
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* \brief
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* This function implements decoding process of a decision as defined
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* in 9.3.3.2.2.
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*
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* \return
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* Returns symbol decoded.
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*
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* \note
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* It is specified in 9.3.3.2.3.2 that, one of the input to this function
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* is CtxIdx. CtxIdx is used to identify state and MPS of that context
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* (Refer Fig 9.11 - Flowchart for encoding a decision). To suffice that
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* here we pass a pointer bin_ctxt_model_t which contains these values.
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*
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**************************************************************************
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*/
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#define DECODE_ONE_BIN_MACRO(p_binCtxt_arg ,u4_code_int_range,u4_code_int_val_ofst, \
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pu4_table_arg, \
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p_DecBitStream_arg,u4_symbol) \
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{ \
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bin_ctxt_model_t *p_binCtxt_m = (bin_ctxt_model_t *) p_binCtxt_arg; \
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dec_bit_stream_t *p_DecBitStream_m = (dec_bit_stream_t *) p_DecBitStream_arg; \
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const UWORD32 *pu4_table_m = (const UWORD32 *) pu4_table_arg; \
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\
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UWORD32 u4_quantCodeIntRange_m,u4_codeIntRangeLPS_m; \
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UWORD32 u1_mps_state_m; \
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UWORD32 table_lookup_m; \
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UWORD32 u4_clz_m; \
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\
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u1_mps_state_m = (p_binCtxt_m->u1_mps_state); \
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u4_clz_m = CLZ(u4_code_int_range); \
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u4_quantCodeIntRange_m = u4_code_int_range << u4_clz_m; \
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u4_quantCodeIntRange_m = (u4_quantCodeIntRange_m >> 29) & 0x3; \
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table_lookup_m = pu4_table_m[(u1_mps_state_m << 2)+u4_quantCodeIntRange_m]; \
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u4_codeIntRangeLPS_m = table_lookup_m & 0xff; \
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\
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u4_codeIntRangeLPS_m = u4_codeIntRangeLPS_m << (23 - u4_clz_m); \
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u4_code_int_range = u4_code_int_range - u4_codeIntRangeLPS_m; \
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u4_symbol = ((u1_mps_state_m>> 6) & 0x1); \
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/*if mps*/ \
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u1_mps_state_m = (table_lookup_m >> 8) & 0x7F; \
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if(u4_code_int_val_ofst >= u4_code_int_range) \
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{ \
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\
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u4_symbol = 1 - u4_symbol; \
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u4_code_int_val_ofst -= u4_code_int_range; \
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u4_code_int_range = u4_codeIntRangeLPS_m; \
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u1_mps_state_m = (table_lookup_m >> 15) & 0x7F; \
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} \
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if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_8) \
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{ \
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UWORD32 *pu4_buffer,u4_offset; \
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UWORD32 read_bits,u4_clz_m ; \
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\
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pu4_buffer = p_DecBitStream_m->pu4_buffer; \
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u4_offset = p_DecBitStream_m->u4_ofst; \
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u4_clz_m = CLZ(u4_code_int_range); \
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NEXTBITS(read_bits,(u4_offset+23),pu4_buffer,u4_clz_m) \
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FLUSHBITS(u4_offset,(u4_clz_m)) \
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u4_code_int_range = u4_code_int_range << u4_clz_m; \
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u4_code_int_val_ofst= (u4_code_int_val_ofst << u4_clz_m) | read_bits; \
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\
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\
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p_DecBitStream_m->u4_ofst = u4_offset; \
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} \
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p_binCtxt_m->u1_mps_state = u1_mps_state_m; \
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}
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#endif /* _IH264D_CABAC_H_ */
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