ref: bb4b01a1f96ee6576fb0ccc8237cf635e89a01ec
dir: h264bsd/src/h264bsd_pic_param_set.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
h264bsdDecodePicParamSet
------------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------
1. Include headers
------------------------------------------------------------------------------*/
#include "h264bsd_pic_param_set.h"
#include "h264bsd_util.h"
#include "h264bsd_vlc.h"
#include "h264bsd_cfg.h"
/*------------------------------------------------------------------------------
2. External compiler flags
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
3. Module defines
------------------------------------------------------------------------------*/
/* lookup table for ceil(log2(numSliceGroups)), i.e. number of bits needed to
* represent range [0, numSliceGroups)
*
* NOTE: if MAX_NUM_SLICE_GROUPS is higher than 8 this table has to be resized
* accordingly */
static const u32 CeilLog2NumSliceGroups[8] = {1, 1, 2, 2, 3, 3, 3, 3};
/*------------------------------------------------------------------------------
4. Local function prototypes
------------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------
Function name: h264bsdDecodePicParamSet
Functional description:
Decode picture parameter set information from the stream.
Function allocates memory for
- run lengths if slice group map type is 0
- top-left and bottom-right arrays if map type is 2
- for slice group ids if map type is 6
Validity of some of the slice group mapping information depends
on the image dimensions which are not known here. Therefore the
validity has to be checked afterwards, currently in the parameter
set activation phase.
Inputs:
pStrmData pointer to stream data structure
Outputs:
pPicParamSet decoded information is stored here
Returns:
HANTRO_OK success
HANTRO_NOK failure, invalid information or end of stream
MEMORY_ALLOCATION_ERROR for memory allocation failure
------------------------------------------------------------------------------*/
u32 h264bsdDecodePicParamSet(strmData_t *pStrmData, picParamSet_t *pPicParamSet)
{
/* Variables */
u32 tmp, i, value;
i32 itmp;
/* Code */
ASSERT(pStrmData);
ASSERT(pPicParamSet);
memset(pPicParamSet, 0, sizeof(picParamSet_t));
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData,
&pPicParamSet->picParameterSetId);
if (tmp != HANTRO_OK)
return(tmp);
if (pPicParamSet->picParameterSetId >= MAX_NUM_PIC_PARAM_SETS)
{
EPRINT("pic_parameter_set_id");
return(HANTRO_NOK);
}
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData,
&pPicParamSet->seqParameterSetId);
if (tmp != HANTRO_OK)
return(tmp);
if (pPicParamSet->seqParameterSetId >= MAX_NUM_SEQ_PARAM_SETS)
{
EPRINT("seq_param_set_id");
return(HANTRO_NOK);
}
/* entropy_coding_mode_flag, shall be 0 for baseline profile */
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp)
{
EPRINT("entropy_coding_mode_flag");
return(HANTRO_NOK);
}
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pPicParamSet->picOrderPresentFlag = (tmp == 1) ? HANTRO_TRUE : HANTRO_FALSE;
/* num_slice_groups_minus1 */
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pPicParamSet->numSliceGroups = value + 1;
if (pPicParamSet->numSliceGroups > MAX_NUM_SLICE_GROUPS)
{
EPRINT("num_slice_groups_minus1");
return(HANTRO_NOK);
}
/* decode slice group mapping information if more than one slice groups */
if (pPicParamSet->numSliceGroups > 1)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData,
&pPicParamSet->sliceGroupMapType);
if (tmp != HANTRO_OK)
return(tmp);
if (pPicParamSet->sliceGroupMapType > 6)
{
EPRINT("slice_group_map_type");
return(HANTRO_NOK);
}
if (pPicParamSet->sliceGroupMapType == 0)
{
ALLOCATE(pPicParamSet->runLength,
pPicParamSet->numSliceGroups, u32);
if (pPicParamSet->runLength == NULL)
return(MEMORY_ALLOCATION_ERROR);
for (i = 0; i < pPicParamSet->numSliceGroups; i++)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pPicParamSet->runLength[i] = value+1;
/* param values checked in CheckPps() */
}
}
else if (pPicParamSet->sliceGroupMapType == 2)
{
ALLOCATE(pPicParamSet->topLeft,
pPicParamSet->numSliceGroups - 1, u32);
ALLOCATE(pPicParamSet->bottomRight,
pPicParamSet->numSliceGroups - 1, u32);
if (pPicParamSet->topLeft == NULL ||
pPicParamSet->bottomRight == NULL)
return(MEMORY_ALLOCATION_ERROR);
for (i = 0; i < pPicParamSet->numSliceGroups - 1; i++)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pPicParamSet->topLeft[i] = value;
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pPicParamSet->bottomRight[i] = value;
/* param values checked in CheckPps() */
}
}
else if ( (pPicParamSet->sliceGroupMapType == 3) ||
(pPicParamSet->sliceGroupMapType == 4) ||
(pPicParamSet->sliceGroupMapType == 5) )
{
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pPicParamSet->sliceGroupChangeDirectionFlag =
(tmp == 1) ? HANTRO_TRUE : HANTRO_FALSE;
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pPicParamSet->sliceGroupChangeRate = value + 1;
/* param value checked in CheckPps() */
}
else if (pPicParamSet->sliceGroupMapType == 6)
{
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
pPicParamSet->picSizeInMapUnits = value + 1;
ALLOCATE(pPicParamSet->sliceGroupId,
pPicParamSet->picSizeInMapUnits, u32);
if (pPicParamSet->sliceGroupId == NULL)
return(MEMORY_ALLOCATION_ERROR);
/* determine number of bits needed to represent range
* [0, numSliceGroups) */
tmp = CeilLog2NumSliceGroups[pPicParamSet->numSliceGroups-1];
for (i = 0; i < pPicParamSet->picSizeInMapUnits; i++)
{
pPicParamSet->sliceGroupId[i] = h264bsdGetBits(pStrmData, tmp);
if ( pPicParamSet->sliceGroupId[i] >=
pPicParamSet->numSliceGroups )
{
EPRINT("slice_group_id");
return(HANTRO_NOK);
}
}
}
}
/* num_ref_idx_l0_active_minus1 */
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
if (value > 31)
{
EPRINT("num_ref_idx_l0_active_minus1");
return(HANTRO_NOK);
}
pPicParamSet->numRefIdxL0Active = value + 1;
/* num_ref_idx_l1_active_minus1 */
tmp = h264bsdDecodeExpGolombUnsigned(pStrmData, &value);
if (tmp != HANTRO_OK)
return(tmp);
if (value > 31)
{
EPRINT("num_ref_idx_l1_active_minus1");
return(HANTRO_NOK);
}
/* weighted_pred_flag, this shall be 0 for baseline profile */
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp)
{
EPRINT("weighted_pred_flag");
return(HANTRO_NOK);
}
/* weighted_bipred_idc */
tmp = h264bsdGetBits(pStrmData, 2);
if (tmp > 2)
{
EPRINT("weighted_bipred_idc");
return(HANTRO_NOK);
}
/* pic_init_qp_minus26 */
tmp = h264bsdDecodeExpGolombSigned(pStrmData, &itmp);
if (tmp != HANTRO_OK)
return(tmp);
if ((itmp < -26) || (itmp > 25))
{
EPRINT("pic_init_qp_minus26");
return(HANTRO_NOK);
}
pPicParamSet->picInitQp = (u32)(itmp + 26);
/* pic_init_qs_minus26 */
tmp = h264bsdDecodeExpGolombSigned(pStrmData, &itmp);
if (tmp != HANTRO_OK)
return(tmp);
if ((itmp < -26) || (itmp > 25))
{
EPRINT("pic_init_qs_minus26");
return(HANTRO_NOK);
}
tmp = h264bsdDecodeExpGolombSigned(pStrmData, &itmp);
if (tmp != HANTRO_OK)
return(tmp);
if ((itmp < -12) || (itmp > 12))
{
EPRINT("chroma_qp_index_offset");
return(HANTRO_NOK);
}
pPicParamSet->chromaQpIndexOffset = itmp;
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pPicParamSet->deblockingFilterControlPresentFlag =
(tmp == 1) ? HANTRO_TRUE : HANTRO_FALSE;
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pPicParamSet->constrainedIntraPredFlag = (tmp == 1) ?
HANTRO_TRUE : HANTRO_FALSE;
tmp = h264bsdGetBits(pStrmData, 1);
if (tmp == END_OF_STREAM)
return(HANTRO_NOK);
pPicParamSet->redundantPicCntPresentFlag = (tmp == 1) ?
HANTRO_TRUE : HANTRO_FALSE;
tmp = h264bsdRbspTrailingBits(pStrmData);
/* ignore possible errors in trailing bits of parameters sets */
return(HANTRO_OK);
}