shithub: h264bsd

ref: bb4b01a1f96ee6576fb0ccc8237cf635e89a01ec
dir: h264bsd/src/h264bsd_slice_header.h

/*
 * Copyright (C) 2009 The Android Open Source Project
 * Modified for use by h264bsd standalone library
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*------------------------------------------------------------------------------

    Table of contents

    1. Include headers
    2. Module defines
    3. Data types
    4. Function prototypes

------------------------------------------------------------------------------*/

#ifndef H264SWDEC_SLICE_HEADER_H
#define H264SWDEC_SLICE_HEADER_H

/*------------------------------------------------------------------------------
    1. Include headers
------------------------------------------------------------------------------*/

#include "basetype.h"
#include "h264bsd_stream.h"
#include "h264bsd_cfg.h"
#include "h264bsd_seq_param_set.h"
#include "h264bsd_pic_param_set.h"
#include "h264bsd_nal_unit.h"

/*------------------------------------------------------------------------------
    2. Module defines
------------------------------------------------------------------------------*/

enum {
    P_SLICE = 0,
    I_SLICE = 2
};

enum {NO_LONG_TERM_FRAME_INDICES = 0xFFFF};

/* macro to determine if slice is an inter slice, sliceTypes 0 and 5 */
#define IS_P_SLICE(sliceType) (((sliceType) == P_SLICE) || \
    ((sliceType) == P_SLICE + 5))

/* macro to determine if slice is an intra slice, sliceTypes 2 and 7 */
#define IS_I_SLICE(sliceType) (((sliceType) == I_SLICE) || \
    ((sliceType) == I_SLICE + 5))

/*------------------------------------------------------------------------------
    3. Data types
------------------------------------------------------------------------------*/

/* structure to store data of one reference picture list reordering operation */
typedef struct
{
    u32 reorderingOfPicNumsIdc;
    u32 absDiffPicNum;
    u32 longTermPicNum;
} refPicListReorderingOperation_t;

/* structure to store reference picture list reordering operations */
typedef struct
{
    u32 refPicListReorderingFlagL0;
    refPicListReorderingOperation_t command[MAX_NUM_REF_PICS+1];
} refPicListReordering_t;

/* structure to store data of one DPB memory management control operation */
typedef struct
{
    u32 memoryManagementControlOperation;
    u32 differenceOfPicNums;
    u32 longTermPicNum;
    u32 longTermFrameIdx;
    u32 maxLongTermFrameIdx;
} memoryManagementOperation_t;

/* worst case scenario: all MAX_NUM_REF_PICS pictures in the buffer are
 * short term pictures, each one of them is first marked as long term
 * reference picture which is then marked as unused for reference.
 * Additionally, max long-term frame index is set and current picture is
 * marked as long term reference picture. Last position reserved for
 * end memory_management_control_operation command */
#define MAX_NUM_MMC_OPERATIONS (2*MAX_NUM_REF_PICS+2+1)

/* structure to store decoded reference picture marking data */
typedef struct
{
    u32 noOutputOfPriorPicsFlag;
    u32 longTermReferenceFlag;
    u32 adaptiveRefPicMarkingModeFlag;
    memoryManagementOperation_t operation[MAX_NUM_MMC_OPERATIONS];
} decRefPicMarking_t;

/* structure to store slice header data decoded from the stream */
typedef struct
{
    u32 firstMbInSlice;
    u32 sliceType;
    u32 picParameterSetId;
    u32 frameNum;
    u32 idrPicId;
    u32 picOrderCntLsb;
    i32 deltaPicOrderCntBottom;
    i32 deltaPicOrderCnt[2];
    u32 redundantPicCnt;
    u32 numRefIdxActiveOverrideFlag;
    u32 numRefIdxL0Active;
    i32 sliceQpDelta;
    u32 disableDeblockingFilterIdc;
    i32 sliceAlphaC0Offset;
    i32 sliceBetaOffset;
    u32 sliceGroupChangeCycle;
    refPicListReordering_t refPicListReordering;
    decRefPicMarking_t decRefPicMarking;
} sliceHeader_t;

/*------------------------------------------------------------------------------
    4. Function prototypes
------------------------------------------------------------------------------*/

u32 h264bsdDecodeSliceHeader(strmData_t *pStrmData,
  sliceHeader_t *pSliceHeader,
  seqParamSet_t *pSeqParamSet,
  picParamSet_t *pPicParamSet,
  nalUnit_t *pNalUnit);

u32 h264bsdCheckPpsId(strmData_t *pStrmData, u32 *ppsId);

u32 h264bsdCheckFrameNum(
  strmData_t *pStrmData,
  u32 maxFrameNum,
  u32 *frameNum);

u32 h264bsdCheckIdrPicId(
  strmData_t *pStrmData,
  u32 maxFrameNum,
  nalUnitType_e nalUnitType,
  u32 *idrPicId);

u32 h264bsdCheckPicOrderCntLsb(
  strmData_t *pStrmData,
  seqParamSet_t *pSeqParamSet,
  nalUnitType_e nalUnitType,
  u32 *picOrderCntLsb);

u32 h264bsdCheckDeltaPicOrderCntBottom(
  strmData_t *pStrmData,
  seqParamSet_t *pSeqParamSet,
  nalUnitType_e nalUnitType,
  i32 *deltaPicOrderCntBottom);

u32 h264bsdCheckDeltaPicOrderCnt(
  strmData_t *pStrmData,
  seqParamSet_t *pSeqParamSet,
  nalUnitType_e nalUnitType,
  u32 picOrderPresentFlag,
  i32 *deltaPicOrderCnt);

u32 h264bsdCheckRedundantPicCnt(
  strmData_t *pStrmData,
  seqParamSet_t *pSeqParamSet,
  picParamSet_t *pPicParamSet,
  nalUnitType_e nalUnitType,
  u32 *redundantPicCnt);

u32 h264bsdCheckPriorPicsFlag(u32 * noOutputOfPriorPicsFlag,
                              const strmData_t * pStrmData,
                              const seqParamSet_t * pSeqParamSet,
                              const picParamSet_t * pPicParamSet,
                              nalUnitType_e nalUnitType);

#endif /* #ifdef H264SWDEC_SLICE_HEADER_H */