ref: ac47fb12e8cac244fc7703607a42e54f37948270
dir: /src/h264bsd_slice_header.c/
/*
* 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. External compiler flags
3. Module defines
4. Local function prototypes
5. Functions
h264bsdDecodeSliceHeader
NumSliceGroupChangeCycleBits
RefPicListReordering
DecRefPicMarking
CheckPpsId
CheckFrameNum
CheckIdrPicId
CheckPicOrderCntLsb
CheckDeltaPicOrderCntBottom
CheckDeltaPicOrderCnt
CheckRedundantPicCnt
------------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------
1. Include headers
------------------------------------------------------------------------------*/
#include "h264bsd_slice_header.h"
#include "h264bsd_util.h"
#include "h264bsd_vlc.h"
#include "h264bsd_nal_unit.h"
#include "h264bsd_dpb.h"
/*------------------------------------------------------------------------------
2. External compiler flags
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
3. Module defines
------------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------
4. Local function prototypes
------------------------------------------------------------------------------*/
static u32 RefPicListReordering(strmData_t *, refPicListReordering_t *,
u32, u32);
static u32 NumSliceGroupChangeCycleBits(u32 picSizeInMbs,
u32 sliceGroupChangeRate);
static u32 DecRefPicMarking(strmData_t *pStrmData,
decRefPicMarking_t *pDecRefPicMarking, nalUnitType_e nalUnitType,
u32 numRefFrames);
/*------------------------------------------------------------------------------
Function name: h264bsdDecodeSliceHeader
Functional description:
Decode slice header data from the stream.
Inputs:
pStrmData pointer to stream data structure
pSeqParamSet pointer to active sequence parameter set
pPicParamSet pointer to active picture parameter set
pNalUnit pointer to current NAL unit structure
Outputs:
pSliceHeader decoded data is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data or end of stream
------------------------------------------------------------------------------*/
u32 h264bsdDecodeSliceHeader(strmData_t *pStrmData, sliceHeader_t *pSliceHeader,
seqParamSet_t *pSeqParamSet, picParamSet_t *pPicParamSet,
nalUnit_t *pNalUnit)
{
/* Variables */
u32 tmp, i, value;
i32 itmp;
u32 picSizeInMbs;
/* Code */
ASSERT(pStrmData);
ASSERT(pSliceHeader);
ASSERT(pSeqParamSet);
ASSERT(pPicParamSet);
ASSERT( pNalUnit->nalUnitType == NAL_CODED_SLICE ||
pNalUnit->nalUnitType == NAL_CODED_SLICE_IDR );
memset(pSliceHeader, 0, sizeof(sliceHeader_t));
picSizeInMbs = pSeqParamSet->picWidthInMbs * pSeqParamSet->picHeightInMbs;
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->firstMbInSlice = value;
if (value >= picSizeInMbs)
{
EPRINT("first_mb_in_slice");
return(HANTRO_NOK);
}
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->sliceType = value;
/* slice type has to be either I or P slice. P slice is not allowed when
* current NAL unit is an IDR NAL unit or num_ref_frames is 0 */
if ( !IS_I_SLICE(pSliceHeader->sliceType) &&
( !IS_P_SLICE(pSliceHeader->sliceType) ||
IS_IDR_NAL_UNIT(pNalUnit) ||
!pSeqParamSet->numRefFrames ) )
{
EPRINT("slice_type");
return(HANTRO_NOK);
}
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->picParameterSetId = value;
if (pSliceHeader->picParameterSetId != pPicParamSet->picParameterSetId)
{
EPRINT("pic_parameter_set_id");
return(HANTRO_NOK);
}
/* log2(maxFrameNum) -> num bits to represent frame_num */
i = 0;
while (pSeqParamSet->maxFrameNum >> i)
i++;
i--;
tmp = h264bsdGetBits(pStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
if (IS_IDR_NAL_UNIT(pNalUnit) && tmp != 0)
{
EPRINT("frame_num");
return(HANTRO_NOK);
}
pSliceHeader->frameNum = tmp;
if (IS_IDR_NAL_UNIT(pNalUnit))
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->idrPicId = value;
if (value > 65535)
{
EPRINT("idr_pic_id");
return(HANTRO_NOK);
}
}
if (pSeqParamSet->picOrderCntType == 0)
{
/* log2(maxPicOrderCntLsb) -> num bits to represent pic_order_cnt_lsb */
i = 0;
while (pSeqParamSet->maxPicOrderCntLsb >> i)
i++;
i--;
tmp = h264bsdGetBits(pStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pSliceHeader->picOrderCntLsb = tmp;
if (pPicParamSet->picOrderPresentFlag)
{
tmp = h264bsdDecodeExpGolombSigned(pStrmData, &itmp);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->deltaPicOrderCntBottom = itmp;
}
/* check that picOrderCnt for IDR picture will be zero. See
* DecodePicOrderCnt function to understand the logic here */
if ( IS_IDR_NAL_UNIT(pNalUnit) &&
( (pSliceHeader->picOrderCntLsb >
pSeqParamSet->maxPicOrderCntLsb/2) ||
MIN((i32)pSliceHeader->picOrderCntLsb,
(i32)pSliceHeader->picOrderCntLsb +
pSliceHeader->deltaPicOrderCntBottom) != 0 ) )
{
return(HANTRO_NOK);
}
}
if ( (pSeqParamSet->picOrderCntType == 1) &&
!pSeqParamSet->deltaPicOrderAlwaysZeroFlag )
{
tmp = h264bsdDecodeExpGolombSigned(pStrmData, &itmp);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->deltaPicOrderCnt[0] = itmp;
if (pPicParamSet->picOrderPresentFlag)
{
tmp = h264bsdDecodeExpGolombSigned(pStrmData, &itmp);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->deltaPicOrderCnt[1] = itmp;
}
/* check that picOrderCnt for IDR picture will be zero. See
* DecodePicOrderCnt function to understand the logic here */
if ( IS_IDR_NAL_UNIT(pNalUnit) &&
MIN(pSliceHeader->deltaPicOrderCnt[0],
pSliceHeader->deltaPicOrderCnt[0] +
pSeqParamSet->offsetForTopToBottomField +
pSliceHeader->deltaPicOrderCnt[1]) != 0)
{
return(HANTRO_NOK);
}
}
if (pPicParamSet->redundantPicCntPresentFlag)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->redundantPicCnt = value;
if (value > 127)
{
EPRINT("redundant_pic_cnt");
return(HANTRO_NOK);
}
}
if (IS_P_SLICE(pSliceHeader->sliceType))
{
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pSliceHeader->numRefIdxActiveOverrideFlag = tmp;
if (pSliceHeader->numRefIdxActiveOverrideFlag)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
if (value > 15)
{
EPRINT("num_ref_idx_l0_active_minus1");
return(HANTRO_NOK);
}
pSliceHeader->numRefIdxL0Active = value + 1;
}
/* set numRefIdxL0Active from pic param set */
else
{
/* if value (minus1) in picture parameter set exceeds 15 it should
* have been overridden here */
if (pPicParamSet->numRefIdxL0Active > 16)
{
EPRINT("num_ref_idx_active_override_flag");
return(HANTRO_NOK);
}
pSliceHeader->numRefIdxL0Active = pPicParamSet->numRefIdxL0Active;
}
}
if (IS_P_SLICE(pSliceHeader->sliceType))
{
tmp = RefPicListReordering(pStrmData,
&pSliceHeader->refPicListReordering,
pSliceHeader->numRefIdxL0Active,
pSeqParamSet->maxFrameNum);
if (tmp != HANTRO_OK)
return(tmp);
}
if (pNalUnit->nalRefIdc != 0)
{
tmp = DecRefPicMarking(pStrmData, &pSliceHeader->decRefPicMarking,
pNalUnit->nalUnitType, pSeqParamSet->numRefFrames);
if (tmp != HANTRO_OK)
return(tmp);
}
/* decode sliceQpDelta and check that initial QP for the slice will be on
* the range [0, 51] */
tmp = h264bsdDecodeExpGolombSigned(pStrmData, &itmp);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->sliceQpDelta = itmp;
itmp += (i32)pPicParamSet->picInitQp;
if ( (itmp < 0) || (itmp > 51) )
{
EPRINT("slice_qp_delta");
return(HANTRO_NOK);
}
if (pPicParamSet->deblockingFilterControlPresentFlag)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pSliceHeader->disableDeblockingFilterIdc = value;
if (pSliceHeader->disableDeblockingFilterIdc > 2)
{
EPRINT("disable_deblocking_filter_idc");
return(HANTRO_NOK);
}
if (pSliceHeader->disableDeblockingFilterIdc != 1)
{
tmp = h264bsdDecodeExpGolombSigned(pStrmData, &itmp);
if (tmp != HANTRO_OK)
return(tmp);
if ( (itmp < -6) || (itmp > 6) )
{
EPRINT("slice_alpha_c0_offset_div2");
return(HANTRO_NOK);
}
pSliceHeader->sliceAlphaC0Offset = itmp * 2;
tmp = h264bsdDecodeExpGolombSigned(pStrmData, &itmp);
if (tmp != HANTRO_OK)
return(tmp);
if ( (itmp < -6) || (itmp > 6) )
{
EPRINT("slice_beta_offset_div2");
return(HANTRO_NOK);
}
pSliceHeader->sliceBetaOffset = itmp * 2;
}
}
if ( (pPicParamSet->numSliceGroups > 1) &&
(pPicParamSet->sliceGroupMapType >= 3) &&
(pPicParamSet->sliceGroupMapType <= 5) )
{
/* set tmp to number of bits used to represent slice_group_change_cycle
* in the stream */
tmp = NumSliceGroupChangeCycleBits(picSizeInMbs,
pPicParamSet->sliceGroupChangeRate);
value = h264bsdGetBits(pStrmData, tmp);
if (value == END_OF_STREAM)
return(HANTRO_NOK);
pSliceHeader->sliceGroupChangeCycle = value;
/* corresponds to tmp = Ceil(picSizeInMbs / sliceGroupChangeRate) */
tmp = (picSizeInMbs + pPicParamSet->sliceGroupChangeRate - 1) /
pPicParamSet->sliceGroupChangeRate;
if (pSliceHeader->sliceGroupChangeCycle > tmp)
{
EPRINT("slice_group_change_cycle");
return(HANTRO_NOK);
}
}
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function: NumSliceGroupChangeCycleBits
Functional description:
Determine number of bits needed to represent
slice_group_change_cycle in the stream. The standard states that
slice_group_change_cycle is represented by
Ceil( Log2( (picSizeInMbs / sliceGroupChangeRate) + 1) )
bits. Division "/" in the equation is non-truncating division.
Inputs:
picSizeInMbs picture size in macroblocks
sliceGroupChangeRate
Outputs:
none
Returns:
number of bits needed
------------------------------------------------------------------------------*/
u32 NumSliceGroupChangeCycleBits(u32 picSizeInMbs, u32 sliceGroupChangeRate)
{
/* Variables */
u32 tmp,numBits,mask;
/* Code */
ASSERT(picSizeInMbs);
ASSERT(sliceGroupChangeRate);
ASSERT(sliceGroupChangeRate <= picSizeInMbs);
/* compute (picSizeInMbs / sliceGroupChangeRate + 1), rounded up */
if (picSizeInMbs % sliceGroupChangeRate)
tmp = 2 + picSizeInMbs/sliceGroupChangeRate;
else
tmp = 1 + picSizeInMbs/sliceGroupChangeRate;
numBits = 0;
mask = ~0U;
/* set numBits to position of right-most non-zero bit */
while (tmp & (mask<<++numBits))
;
numBits--;
/* add one more bit if value greater than 2^numBits */
if (tmp & ((1<<numBits)-1))
numBits++;
return(numBits);
}
/*------------------------------------------------------------------------------
Function: RefPicListReordering
Functional description:
Decode reference picture list reordering syntax elements from
the stream. Max number of reordering commands is numRefIdxActive.
Inputs:
pStrmData pointer to stream data structure
numRefIdxActive number of active reference indices to be used for
current slice
maxPicNum maxFrameNum from the active SPS
Outputs:
pRefPicListReordering decoded data is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
u32 RefPicListReordering(strmData_t *pStrmData,
refPicListReordering_t *pRefPicListReordering, u32 numRefIdxActive,
u32 maxPicNum)
{
/* Variables */
u32 tmp, value, i;
u32 command;
/* Code */
ASSERT(pStrmData);
ASSERT(pRefPicListReordering);
ASSERT(numRefIdxActive);
ASSERT(maxPicNum);
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pRefPicListReordering->refPicListReorderingFlagL0 = tmp;
if (pRefPicListReordering->refPicListReorderingFlagL0)
{
i = 0;
do
{
if (i > numRefIdxActive)
{
EPRINT("Too many reordering commands");
return(HANTRO_NOK);
}
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &command);
if (tmp != HANTRO_OK)
return(tmp);
if (command > 3)
{
EPRINT("reordering_of_pic_nums_idc");
return(HANTRO_NOK);
}
pRefPicListReordering->command[i].reorderingOfPicNumsIdc = command;
if ((command == 0) || (command == 1))
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
if (value >= maxPicNum)
{
EPRINT("abs_diff_pic_num_minus1");
return(HANTRO_NOK);
}
pRefPicListReordering->command[i].absDiffPicNum = value + 1;
}
else if (command == 2)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pRefPicListReordering->command[i].longTermPicNum = value;
}
i++;
} while (command != 3);
/* there shall be at least one reordering command if
* refPicListReorderingFlagL0 was set */
if (i == 1)
{
EPRINT("ref_pic_list_reordering");
return(HANTRO_NOK);
}
}
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function: DecRefPicMarking
Functional description:
Decode decoded reference picture marking syntax elements from
the stream.
Inputs:
pStrmData pointer to stream data structure
nalUnitType type of the current NAL unit
numRefFrames max number of reference frames from the active SPS
Outputs:
pDecRefPicMarking decoded data is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
u32 DecRefPicMarking(strmData_t *pStrmData,
decRefPicMarking_t *pDecRefPicMarking, nalUnitType_e nalUnitType,
u32 numRefFrames)
{
/* Variables */
u32 tmp, value;
u32 i;
u32 operation;
/* variables for error checking purposes, store number of memory
* management operations of certain type */
u32 num4 = 0, num5 = 0, num6 = 0, num1to3 = 0;
/* Code */
ASSERT( nalUnitType == NAL_CODED_SLICE_IDR ||
nalUnitType == NAL_CODED_SLICE ||
nalUnitType == NAL_SEI );
if (nalUnitType == NAL_CODED_SLICE_IDR)
{
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pDecRefPicMarking->noOutputOfPriorPicsFlag = tmp;
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pDecRefPicMarking->longTermReferenceFlag = tmp;
if (!numRefFrames && pDecRefPicMarking->longTermReferenceFlag)
{
EPRINT("long_term_reference_flag");
return(HANTRO_NOK);
}
}
else
{
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pDecRefPicMarking->adaptiveRefPicMarkingModeFlag = tmp;
if (pDecRefPicMarking->adaptiveRefPicMarkingModeFlag)
{
i = 0;
do
{
/* see explanation of the MAX_NUM_MMC_OPERATIONS in
* slice_header.h */
if (i > (2 * numRefFrames + 2))
{
EPRINT("Too many management operations");
return(HANTRO_NOK);
}
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &operation);
if (tmp != HANTRO_OK)
return(tmp);
if (operation > 6)
{
EPRINT("memory_management_control_operation");
return(HANTRO_NOK);
}
pDecRefPicMarking->operation[i].
memoryManagementControlOperation = operation;
if ((operation == 1) || (operation == 3))
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pDecRefPicMarking->operation[i].differenceOfPicNums =
value + 1;
}
if (operation == 2)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pDecRefPicMarking->operation[i].longTermPicNum = value;
}
if ((operation == 3) || (operation == 6))
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pDecRefPicMarking->operation[i].longTermFrameIdx =
value;
}
if (operation == 4)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* value shall be in range [0, numRefFrames] */
if (value > numRefFrames)
{
EPRINT("max_long_term_frame_idx_plus1");
return(HANTRO_NOK);
}
if (value == 0)
{
pDecRefPicMarking->operation[i].
maxLongTermFrameIdx =
NO_LONG_TERM_FRAME_INDICES;
}
else
{
pDecRefPicMarking->operation[i].
maxLongTermFrameIdx = value - 1;
}
num4++;
}
if (operation == 5)
{
num5++;
}
if (operation && operation <= 3)
num1to3++;
if (operation == 6)
num6++;
i++;
} while (operation != 0);
/* error checking */
if (num4 > 1 || num5 > 1 || num6 > 1 || (num1to3 && num5))
return(HANTRO_NOK);
}
}
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function name: h264bsdCheckPpsId
Functional description:
Peek value of pic_parameter_set_id from the slice header. Function
does not modify current stream positions but copies the stream
data structure to tmp structure which is used while accessing
stream data.
Inputs:
pStrmData pointer to stream data structure
Outputs:
picParamSetId value is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
u32 h264bsdCheckPpsId(strmData_t *pStrmData, u32 *picParamSetId)
{
/* Variables */
u32 tmp, value;
strmData_t tmpStrmData[1];
/* Code */
ASSERT(pStrmData);
/* don't touch original stream position params */
*tmpStrmData = *pStrmData;
/* first_mb_in_slice */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* slice_type */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
if (value >= MAX_NUM_PIC_PARAM_SETS)
return(HANTRO_NOK);
*picParamSetId = value;
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function: h264bsdCheckFrameNum
Functional description:
Peek value of frame_num from the slice header. Function does not
modify current stream positions but copies the stream data
structure to tmp structure which is used while accessing stream
data.
Inputs:
pStrmData pointer to stream data structure
maxFrameNum
Outputs:
frameNum value is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
u32 h264bsdCheckFrameNum(
strmData_t *pStrmData,
u32 maxFrameNum,
u32 *frameNum)
{
/* Variables */
u32 tmp, value, i;
strmData_t tmpStrmData[1];
/* Code */
ASSERT(pStrmData);
ASSERT(maxFrameNum);
ASSERT(frameNum);
/* don't touch original stream position params */
*tmpStrmData = *pStrmData;
/* skip first_mb_in_slice */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip slice_type */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip pic_parameter_set_id */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* log2(maxFrameNum) -> num bits to represent frame_num */
i = 0;
while (maxFrameNum >> i)
i++;
i--;
/* frame_num */
tmp = h264bsdGetBits(tmpStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
*frameNum = tmp;
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function: h264bsdCheckIdrPicId
Functional description:
Peek value of idr_pic_id from the slice header. Function does not
modify current stream positions but copies the stream data
structure to tmp structure which is used while accessing stream
data.
Inputs:
pStrmData pointer to stream data structure
maxFrameNum max frame number from active SPS
nalUnitType type of the current NAL unit
Outputs:
idrPicId value is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
u32 h264bsdCheckIdrPicId(
strmData_t *pStrmData,
u32 maxFrameNum,
nalUnitType_e nalUnitType,
u32 *idrPicId)
{
/* Variables */
u32 tmp, value, i;
strmData_t tmpStrmData[1];
/* Code */
ASSERT(pStrmData);
ASSERT(maxFrameNum);
ASSERT(idrPicId);
/* nalUnitType must be equal to 5 because otherwise idrPicId is not
* present */
if (nalUnitType != NAL_CODED_SLICE_IDR)
return(HANTRO_NOK);
/* don't touch original stream position params */
*tmpStrmData = *pStrmData;
/* skip first_mb_in_slice */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip slice_type */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip pic_parameter_set_id */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* log2(maxFrameNum) -> num bits to represent frame_num */
i = 0;
while (maxFrameNum >> i)
i++;
i--;
/* skip frame_num */
tmp = h264bsdGetBits(tmpStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
/* idr_pic_id */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, idrPicId);
if (tmp != HANTRO_OK)
return(tmp);
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function: h264bsdCheckPicOrderCntLsb
Functional description:
Peek value of pic_order_cnt_lsb from the slice header. Function
does not modify current stream positions but copies the stream
data structure to tmp structure which is used while accessing
stream data.
Inputs:
pStrmData pointer to stream data structure
pSeqParamSet pointer to active SPS
nalUnitType type of the current NAL unit
Outputs:
picOrderCntLsb value is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
u32 h264bsdCheckPicOrderCntLsb(
strmData_t *pStrmData,
seqParamSet_t *pSeqParamSet,
nalUnitType_e nalUnitType,
u32 *picOrderCntLsb)
{
/* Variables */
u32 tmp, value, i;
strmData_t tmpStrmData[1];
/* Code */
ASSERT(pStrmData);
ASSERT(pSeqParamSet);
ASSERT(picOrderCntLsb);
/* picOrderCntType must be equal to 0 */
ASSERT(pSeqParamSet->picOrderCntType == 0);
ASSERT(pSeqParamSet->maxFrameNum);
ASSERT(pSeqParamSet->maxPicOrderCntLsb);
/* don't touch original stream position params */
*tmpStrmData = *pStrmData;
/* skip first_mb_in_slice */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip slice_type */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip pic_parameter_set_id */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* log2(maxFrameNum) -> num bits to represent frame_num */
i = 0;
while (pSeqParamSet->maxFrameNum >> i)
i++;
i--;
/* skip frame_num */
tmp = h264bsdGetBits(tmpStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
/* skip idr_pic_id when necessary */
if (nalUnitType == NAL_CODED_SLICE_IDR)
{
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
}
/* log2(maxPicOrderCntLsb) -> num bits to represent pic_order_cnt_lsb */
i = 0;
while (pSeqParamSet->maxPicOrderCntLsb >> i)
i++;
i--;
/* pic_order_cnt_lsb */
tmp = h264bsdGetBits(tmpStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
*picOrderCntLsb = tmp;
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function: h264bsdCheckDeltaPicOrderCntBottom
Functional description:
Peek value of delta_pic_order_cnt_bottom from the slice header.
Function does not modify current stream positions but copies the
stream data structure to tmp structure which is used while
accessing stream data.
Inputs:
pStrmData pointer to stream data structure
pSeqParamSet pointer to active SPS
nalUnitType type of the current NAL unit
Outputs:
deltaPicOrderCntBottom value is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
u32 h264bsdCheckDeltaPicOrderCntBottom(
strmData_t *pStrmData,
seqParamSet_t *pSeqParamSet,
nalUnitType_e nalUnitType,
i32 *deltaPicOrderCntBottom)
{
/* Variables */
u32 tmp, value, i;
strmData_t tmpStrmData[1];
/* Code */
ASSERT(pStrmData);
ASSERT(pSeqParamSet);
ASSERT(deltaPicOrderCntBottom);
/* picOrderCntType must be equal to 0 and picOrderPresentFlag must be TRUE
* */
ASSERT(pSeqParamSet->picOrderCntType == 0);
ASSERT(pSeqParamSet->maxFrameNum);
ASSERT(pSeqParamSet->maxPicOrderCntLsb);
/* don't touch original stream position params */
*tmpStrmData = *pStrmData;
/* skip first_mb_in_slice */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip slice_type */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip pic_parameter_set_id */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* log2(maxFrameNum) -> num bits to represent frame_num */
i = 0;
while (pSeqParamSet->maxFrameNum >> i)
i++;
i--;
/* skip frame_num */
tmp = h264bsdGetBits(tmpStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
/* skip idr_pic_id when necessary */
if (nalUnitType == NAL_CODED_SLICE_IDR)
{
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
}
/* log2(maxPicOrderCntLsb) -> num bits to represent pic_order_cnt_lsb */
i = 0;
while (pSeqParamSet->maxPicOrderCntLsb >> i)
i++;
i--;
/* skip pic_order_cnt_lsb */
tmp = h264bsdGetBits(tmpStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
/* delta_pic_order_cnt_bottom */
tmp = h264bsdDecodeExpGolombSigned(tmpStrmData, deltaPicOrderCntBottom);
if (tmp != HANTRO_OK)
return(tmp);
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function: h264bsdCheckDeltaPicOrderCnt
Functional description:
Peek values delta_pic_order_cnt[0] and delta_pic_order_cnt[1]
from the slice header. Function does not modify current stream
positions but copies the stream data structure to tmp structure
which is used while accessing stream data.
Inputs:
pStrmData pointer to stream data structure
pSeqParamSet pointer to active SPS
nalUnitType type of the current NAL unit
picOrderPresentFlag flag indicating if delta_pic_order_cnt[1]
is present in the stream
Outputs:
deltaPicOrderCnt values are stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
u32 h264bsdCheckDeltaPicOrderCnt(
strmData_t *pStrmData,
seqParamSet_t *pSeqParamSet,
nalUnitType_e nalUnitType,
u32 picOrderPresentFlag,
i32 *deltaPicOrderCnt)
{
/* Variables */
u32 tmp, value, i;
strmData_t tmpStrmData[1];
/* Code */
ASSERT(pStrmData);
ASSERT(pSeqParamSet);
ASSERT(deltaPicOrderCnt);
/* picOrderCntType must be equal to 1 and deltaPicOrderAlwaysZeroFlag must
* be FALSE */
ASSERT(pSeqParamSet->picOrderCntType == 1);
ASSERT(!pSeqParamSet->deltaPicOrderAlwaysZeroFlag);
ASSERT(pSeqParamSet->maxFrameNum);
/* don't touch original stream position params */
*tmpStrmData = *pStrmData;
/* skip first_mb_in_slice */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip slice_type */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip pic_parameter_set_id */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* log2(maxFrameNum) -> num bits to represent frame_num */
i = 0;
while (pSeqParamSet->maxFrameNum >> i)
i++;
i--;
/* skip frame_num */
tmp = h264bsdGetBits(tmpStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
/* skip idr_pic_id when necessary */
if (nalUnitType == NAL_CODED_SLICE_IDR)
{
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
}
/* delta_pic_order_cnt[0] */
tmp = h264bsdDecodeExpGolombSigned(tmpStrmData, &deltaPicOrderCnt[0]);
if (tmp != HANTRO_OK)
return(tmp);
/* delta_pic_order_cnt[1] if present */
if (picOrderPresentFlag)
{
tmp = h264bsdDecodeExpGolombSigned(tmpStrmData, &deltaPicOrderCnt[1]);
if (tmp != HANTRO_OK)
return(tmp);
}
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function: h264bsdCheckRedundantPicCnt
Functional description:
Peek value of redundant_pic_cnt from the slice header. Function
does not modify current stream positions but copies the stream
data structure to tmp structure which is used while accessing
stream data.
Inputs:
pStrmData pointer to stream data structure
pSeqParamSet pointer to active SPS
pPicParamSet pointer to active PPS
nalUnitType type of the current NAL unit
Outputs:
redundantPicCnt value is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
u32 h264bsdCheckRedundantPicCnt(
strmData_t *pStrmData,
seqParamSet_t *pSeqParamSet,
picParamSet_t *pPicParamSet,
nalUnitType_e nalUnitType,
u32 *redundantPicCnt)
{
/* Variables */
u32 tmp, value, i;
i32 ivalue;
strmData_t tmpStrmData[1];
/* Code */
ASSERT(pStrmData);
ASSERT(pSeqParamSet);
ASSERT(pPicParamSet);
ASSERT(redundantPicCnt);
/* redundant_pic_cnt_flag must be TRUE */
ASSERT(pPicParamSet->redundantPicCntPresentFlag);
ASSERT(pSeqParamSet->maxFrameNum);
ASSERT(pSeqParamSet->picOrderCntType > 0 ||
pSeqParamSet->maxPicOrderCntLsb);
/* don't touch original stream position params */
*tmpStrmData = *pStrmData;
/* skip first_mb_in_slice */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip slice_type */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* skip pic_parameter_set_id */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
/* log2(maxFrameNum) -> num bits to represent frame_num */
i = 0;
while (pSeqParamSet->maxFrameNum >> i)
i++;
i--;
/* skip frame_num */
tmp = h264bsdGetBits(tmpStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
/* skip idr_pic_id when necessary */
if (nalUnitType == NAL_CODED_SLICE_IDR)
{
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
}
if (pSeqParamSet->picOrderCntType == 0)
{
/* log2(maxPicOrderCntLsb) -> num bits to represent pic_order_cnt_lsb */
i = 0;
while (pSeqParamSet->maxPicOrderCntLsb >> i)
i++;
i--;
/* pic_order_cnt_lsb */
tmp = h264bsdGetBits(tmpStrmData, i);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
if (pPicParamSet->picOrderPresentFlag)
{
/* skip delta_pic_order_cnt_bottom */
tmp = h264bsdDecodeExpGolombSigned(tmpStrmData, &ivalue);
if (tmp != HANTRO_OK)
return(tmp);
}
}
if (pSeqParamSet->picOrderCntType == 1 &&
!pSeqParamSet->deltaPicOrderAlwaysZeroFlag)
{
/* delta_pic_order_cnt[0] */
tmp = h264bsdDecodeExpGolombSigned(tmpStrmData, &ivalue);
if (tmp != HANTRO_OK)
return(tmp);
/* delta_pic_order_cnt[1] if present */
if (pPicParamSet->picOrderPresentFlag)
{
tmp = h264bsdDecodeExpGolombSigned(tmpStrmData, &ivalue);
if (tmp != HANTRO_OK)
return(tmp);
}
}
/* redundant_pic_cnt */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, redundantPicCnt);
if (tmp != HANTRO_OK)
return(tmp);
return(HANTRO_OK);
}
/*------------------------------------------------------------------------------
Function: h264bsdCheckPriorPicsFlag
Functional description:
Peek value of no_output_of_prior_pics_flag from the slice header.
Function does not modify current stream positions but copies
the stream data structure to tmp structure which is used while
accessing stream data.
Inputs:
pStrmData pointer to stream data structure
pSeqParamSet pointer to active SPS
pPicParamSet pointer to active PPS
nalUnitType type of the current NAL unit
Outputs:
noOutputOfPriorPicsFlag value is stored here
Returns:
HANTRO_OK success
HANTRO_NOK invalid stream data
------------------------------------------------------------------------------*/
/*lint -e715 disable lint info nalUnitType not referenced */
u32 h264bsdCheckPriorPicsFlag(u32 * noOutputOfPriorPicsFlag,
const strmData_t * pStrmData,
const seqParamSet_t * pSeqParamSet,
const picParamSet_t * pPicParamSet,
nalUnitType_e nalUnitType)
{
/* Variables */
u32 tmp, value, i;
i32 ivalue;
strmData_t tmpStrmData[1];
/* Code */
ASSERT(pStrmData);
ASSERT(pSeqParamSet);
ASSERT(pPicParamSet);
ASSERT(noOutputOfPriorPicsFlag);
/* must be IDR lsice */
ASSERT(nalUnitType == NAL_CODED_SLICE_IDR);
/* don't touch original stream position params */
*tmpStrmData = *pStrmData;
/* skip first_mb_in_slice */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if(tmp != HANTRO_OK)
return (tmp);
/* slice_type */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if(tmp != HANTRO_OK)
return (tmp);
/* skip pic_parameter_set_id */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if(tmp != HANTRO_OK)
return (tmp);
/* log2(maxFrameNum) -> num bits to represent frame_num */
i = 0;
while(pSeqParamSet->maxFrameNum >> i)
i++;
i--;
/* skip frame_num */
tmp = h264bsdGetBits(tmpStrmData, i);
if(tmp == END_OF_STREAM)
return (HANTRO_NOK);
/* skip idr_pic_id */
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if(tmp != HANTRO_OK)
return (tmp);
if(pSeqParamSet->picOrderCntType == 0)
{
/* log2(maxPicOrderCntLsb) -> num bits to represent pic_order_cnt_lsb */
i = 0;
while(pSeqParamSet->maxPicOrderCntLsb >> i)
i++;
i--;
/* skip pic_order_cnt_lsb */
tmp = h264bsdGetBits(tmpStrmData, i);
if(tmp == END_OF_STREAM)
return (HANTRO_NOK);
if(pPicParamSet->picOrderPresentFlag)
{
/* skip delta_pic_order_cnt_bottom */
tmp = h264bsdDecodeExpGolombSigned(tmpStrmData, &ivalue);
if(tmp != HANTRO_OK)
return (tmp);
}
}
if(pSeqParamSet->picOrderCntType == 1 &&
!pSeqParamSet->deltaPicOrderAlwaysZeroFlag)
{
/* skip delta_pic_order_cnt[0] */
tmp = h264bsdDecodeExpGolombSigned(tmpStrmData, &ivalue);
if(tmp != HANTRO_OK)
return (tmp);
/* skip delta_pic_order_cnt[1] if present */
if(pPicParamSet->picOrderPresentFlag)
{
tmp = h264bsdDecodeExpGolombSigned(tmpStrmData, &ivalue);
if(tmp != HANTRO_OK)
return (tmp);
}
}
/* skip redundant_pic_cnt */
if(pPicParamSet->redundantPicCntPresentFlag)
{
tmp = h264bsdDecodeExpGolombUnsigned(tmpStrmData, &value);
if(tmp != HANTRO_OK)
return (tmp);
}
*noOutputOfPriorPicsFlag = h264bsdGetBits(tmpStrmData, 1);
if(*noOutputOfPriorPicsFlag == END_OF_STREAM)
return (HANTRO_NOK);
return (HANTRO_OK);
}
/*lint +e715 */