ref: e9abdf4e1f0586d3b50cc19c34098c1be13b9d68
dir: h264bsd/src/h264bsd_decoder.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
h264bsdInit
h264bsdDecode
h264bsdShutdown
h264bsdCurrentImage
h264bsdNextOutputPicture
h264bsdPicWidth
h264bsdPicHeight
h264bsdFlushBuffer
h264bsdCheckValidParamSets
h264bsdVideoRange
h264bsdMatrixCoefficients
h264bsdCroppingParams
------------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------
1. Include headers
------------------------------------------------------------------------------*/
#include "h264bsd_decoder.h"
#include "h264bsd_nal_unit.h"
#include "h264bsd_byte_stream.h"
#include "h264bsd_seq_param_set.h"
#include "h264bsd_pic_param_set.h"
#include "h264bsd_slice_header.h"
#include "h264bsd_slice_data.h"
#include "h264bsd_neighbour.h"
#include "h264bsd_util.h"
#include "h264bsd_dpb.h"
#include "h264bsd_deblocking.h"
#include "h264bsd_conceal.h"
#include "h264bsd_storage.h"
/*------------------------------------------------------------------------------
2. External compiler flags
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
3. Module defines
------------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------
4. Local function prototypes
------------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------
Function name: h264bsdInit
Functional description:
Initialize the decoder.
Inputs:
noOutputReordering flag to indicate the decoder that it does not
have to perform reordering of display images.
Outputs:
pStorage pointer to initialized storage structure
Returns:
none
------------------------------------------------------------------------------*/
u32 h264bsdInit(storage_t *pStorage, u32 noOutputReordering)
{
/* Variables */
u32 size;
/* Code */
ASSERT(pStorage);
h264bsdInitStorage(pStorage);
/* allocate mbLayer to be next multiple of 64 to enable use of
* specific NEON optimized "memset" for clearing the structure */
size = (sizeof(macroblockLayer_t) + 63) & ~0x3F;
pStorage->mbLayer = (macroblockLayer_t*)malloc(size);
if (!pStorage->mbLayer)
return HANTRO_NOK;
if (noOutputReordering)
pStorage->noReordering = HANTRO_TRUE;
return HANTRO_OK;
}
/*------------------------------------------------------------------------------
Function: h264bsdDecode
Functional description:
Decode a NAL unit. This function calls other modules to perform
tasks like
* extract and decode NAL unit from the byte stream
* decode parameter sets
* decode slice header and slice data
* conceal errors in the picture
* perform deblocking filtering
This function contains top level control logic of the decoder.
Inputs:
pStorage pointer to storage data structure
byteStrm pointer to stream buffer given by application
len length of the buffer in bytes
picId identifier for a picture, assigned by the
application
Outputs:
readBytes number of bytes read from the stream is stored
here
Returns:
H264BSD_RDY decoding finished, nothing special
H264BSD_PIC_RDY decoding of a picture finished
H264BSD_HDRS_RDY param sets activated, information like
picture dimensions etc can be read
H264BSD_ERROR error in decoding
H264BSD_PARAM_SET_ERROR serius error in decoding, failed to
activate param sets
------------------------------------------------------------------------------*/
u32 h264bsdDecode(storage_t *pStorage, u8 *byteStrm, u32 len, u32 picId,
u32 *readBytes)
{
/* Variables */
u32 tmp, ppsId, spsId;
i32 picOrderCnt;
nalUnit_t nalUnit;
seqParamSet_t seqParamSet;
picParamSet_t picParamSet;
strmData_t strm;
u32 accessUnitBoundaryFlag = HANTRO_FALSE;
u32 picReady = HANTRO_FALSE;
/* Code */
ASSERT(pStorage);
ASSERT(byteStrm);
ASSERT(len);
ASSERT(readBytes);
/* if previous buffer was not finished and same pointer given -> skip NAL
* unit extraction */
if (pStorage->prevBufNotFinished && byteStrm == pStorage->prevBufPointer)
{
strm = pStorage->strm[0];
strm.pStrmCurrPos = strm.pStrmBuffStart;
strm.strmBuffReadBits = strm.bitPosInWord = 0;
*readBytes = pStorage->prevBytesConsumed;
}
else
{
tmp = h264bsdExtractNalUnit(byteStrm, len, &strm, readBytes);
if (tmp != HANTRO_OK)
{
EPRINT("BYTE_STREAM");
return(H264BSD_ERROR);
}
/* store stream */
pStorage->strm[0] = strm;
pStorage->prevBytesConsumed = *readBytes;
pStorage->prevBufPointer = byteStrm;
}
pStorage->prevBufNotFinished = HANTRO_FALSE;
tmp = h264bsdDecodeNalUnit(&strm, &nalUnit);
if (tmp != HANTRO_OK)
{
EPRINT("NAL_UNIT");
return(H264BSD_ERROR);
}
/* Discard unspecified, reserved, SPS extension and auxiliary picture slices */
if(nalUnit.nalUnitType == 0 || nalUnit.nalUnitType >= 13)
{
DEBUG(("DISCARDED NAL (UNSPECIFIED, REGISTERED, SPS ext or AUX slice)\n"));
return(H264BSD_RDY);
}
tmp = h264bsdCheckAccessUnitBoundary(
&strm,
&nalUnit,
pStorage,
&accessUnitBoundaryFlag);
if (tmp != HANTRO_OK)
{
EPRINT("ACCESS UNIT BOUNDARY CHECK");
if (tmp == PARAM_SET_ERROR)
return(H264BSD_PARAM_SET_ERROR);
else
return(H264BSD_ERROR);
}
if ( accessUnitBoundaryFlag )
{
DEBUG(("Access unit boundary\n"));
/* conceal if picture started and param sets activated */
if (pStorage->picStarted && pStorage->activeSps != NULL)
{
DEBUG(("CONCEALING..."));
/* return error if second phase of
* initialization is not completed */
if (pStorage->pendingActivation)
{
EPRINT("Pending activation not completed");
return (H264BSD_ERROR);
}
if (!pStorage->validSliceInAccessUnit)
{
pStorage->currImage->data =
h264bsdAllocateDpbImage(pStorage->dpb);
h264bsdInitRefPicList(pStorage->dpb);
tmp = h264bsdConceal(pStorage, pStorage->currImage, P_SLICE);
}
else
tmp = h264bsdConceal(pStorage, pStorage->currImage,
pStorage->sliceHeader->sliceType);
picReady = HANTRO_TRUE;
/* current NAL unit should be decoded on next activation -> set
* readBytes to 0 */
*readBytes = 0;
pStorage->prevBufNotFinished = HANTRO_TRUE;
DEBUG(("...DONE\n"));
}
else
{
pStorage->validSliceInAccessUnit = HANTRO_FALSE;
}
pStorage->skipRedundantSlices = HANTRO_FALSE;
}
if (!picReady)
{
switch (nalUnit.nalUnitType)
{
case NAL_SEQ_PARAM_SET:
DEBUG(("SEQ PARAM SET\n"));
tmp = h264bsdDecodeSeqParamSet(&strm, &seqParamSet);
if (tmp != HANTRO_OK)
{
EPRINT("SEQ_PARAM_SET");
FREE(seqParamSet.offsetForRefFrame);
FREE(seqParamSet.vuiParameters);
return(H264BSD_ERROR);
}
tmp = h264bsdStoreSeqParamSet(pStorage, &seqParamSet);
break;
case NAL_PIC_PARAM_SET:
DEBUG(("PIC PARAM SET\n"));
tmp = h264bsdDecodePicParamSet(&strm, &picParamSet);
if (tmp != HANTRO_OK)
{
EPRINT("PIC_PARAM_SET");
FREE(picParamSet.runLength);
FREE(picParamSet.topLeft);
FREE(picParamSet.bottomRight);
FREE(picParamSet.sliceGroupId);
return(H264BSD_ERROR);
}
tmp = h264bsdStorePicParamSet(pStorage, &picParamSet);
break;
case NAL_CODED_SLICE_IDR:
DEBUG(("IDR "));
/* fall through */
case NAL_CODED_SLICE:
DEBUG(("SLICE HEADER\n"));
/* picture successfully finished and still decoding same old
* access unit -> no need to decode redundant slices */
if (pStorage->skipRedundantSlices)
return(H264BSD_RDY);
pStorage->picStarted = HANTRO_TRUE;
if (h264bsdIsStartOfPicture(pStorage))
{
pStorage->numConcealedMbs = 0;
pStorage->currentPicId = picId;
tmp = h264bsdCheckPpsId(&strm, &ppsId);
ASSERT(tmp == HANTRO_OK);
/* store old activeSpsId and return headers ready
* indication if activeSps changes */
spsId = pStorage->activeSpsId;
tmp = h264bsdActivateParamSets(pStorage, ppsId,
IS_IDR_NAL_UNIT(&nalUnit) ?
HANTRO_TRUE : HANTRO_FALSE);
if (tmp != HANTRO_OK)
{
EPRINT("Param set activation");
pStorage->activePpsId = MAX_NUM_PIC_PARAM_SETS;
pStorage->activePps = NULL;
pStorage->activeSpsId = MAX_NUM_SEQ_PARAM_SETS;
pStorage->activeSps = NULL;
pStorage->pendingActivation = HANTRO_FALSE;
if(tmp == MEMORY_ALLOCATION_ERROR)
{
return H264BSD_MEMALLOC_ERROR;
}
else
return(H264BSD_PARAM_SET_ERROR);
}
if (spsId != pStorage->activeSpsId)
{
seqParamSet_t *oldSPS = NULL;
seqParamSet_t *newSPS = pStorage->activeSps;
u32 noOutputOfPriorPicsFlag = 1;
if(pStorage->oldSpsId < MAX_NUM_SEQ_PARAM_SETS)
{
oldSPS = pStorage->sps[pStorage->oldSpsId];
}
*readBytes = 0;
pStorage->prevBufNotFinished = HANTRO_TRUE;
if(nalUnit.nalUnitType == NAL_CODED_SLICE_IDR)
{
tmp =
h264bsdCheckPriorPicsFlag(&noOutputOfPriorPicsFlag,
&strm, newSPS,
pStorage->activePps,
nalUnit.nalUnitType);
}
else
{
tmp = HANTRO_NOK;
}
if((tmp != HANTRO_OK) ||
(noOutputOfPriorPicsFlag != 0) ||
(pStorage->dpb->noReordering) ||
(oldSPS == NULL) ||
(oldSPS->picWidthInMbs != newSPS->picWidthInMbs) ||
(oldSPS->picHeightInMbs != newSPS->picHeightInMbs) ||
(oldSPS->maxDpbSize != newSPS->maxDpbSize))
{
pStorage->dpb->flushed = 0;
}
else
{
h264bsdFlushDpb(pStorage->dpb);
}
pStorage->oldSpsId = pStorage->activeSpsId;
return(H264BSD_HDRS_RDY);
}
}
/* return error if second phase of
* initialization is not completed */
if (pStorage->pendingActivation)
{
EPRINT("Pending activation not completed");
return (H264BSD_ERROR);
}
tmp = h264bsdDecodeSliceHeader(&strm, pStorage->sliceHeader + 1,
pStorage->activeSps, pStorage->activePps, &nalUnit);
if (tmp != HANTRO_OK)
{
EPRINT("SLICE_HEADER");
return(H264BSD_ERROR);
}
if (h264bsdIsStartOfPicture(pStorage))
{
if (!IS_IDR_NAL_UNIT(&nalUnit))
{
tmp = h264bsdCheckGapsInFrameNum(pStorage->dpb,
pStorage->sliceHeader[1].frameNum,
nalUnit.nalRefIdc != 0 ?
HANTRO_TRUE : HANTRO_FALSE,
pStorage->activeSps->
gapsInFrameNumValueAllowedFlag);
if (tmp != HANTRO_OK)
{
EPRINT("Gaps in frame num");
return(H264BSD_ERROR);
}
}
pStorage->currImage->data =
h264bsdAllocateDpbImage(pStorage->dpb);
}
/* store slice header to storage if successfully decoded */
pStorage->sliceHeader[0] = pStorage->sliceHeader[1];
pStorage->validSliceInAccessUnit = HANTRO_TRUE;
pStorage->prevNalUnit[0] = nalUnit;
h264bsdComputeSliceGroupMap(pStorage,
pStorage->sliceHeader->sliceGroupChangeCycle);
h264bsdInitRefPicList(pStorage->dpb);
tmp = h264bsdReorderRefPicList(pStorage->dpb,
&pStorage->sliceHeader->refPicListReordering,
pStorage->sliceHeader->frameNum,
pStorage->sliceHeader->numRefIdxL0Active);
if (tmp != HANTRO_OK)
{
EPRINT("Reordering");
return(H264BSD_ERROR);
}
DEBUG(("SLICE DATA, FIRST %d\n",
pStorage->sliceHeader->firstMbInSlice));
tmp = h264bsdDecodeSliceData(&strm, pStorage,
pStorage->currImage, pStorage->sliceHeader);
if (tmp != HANTRO_OK)
{
EPRINT("SLICE_DATA");
h264bsdMarkSliceCorrupted(pStorage,
pStorage->sliceHeader->firstMbInSlice);
return(H264BSD_ERROR);
}
if (h264bsdIsEndOfPicture(pStorage))
{
picReady = HANTRO_TRUE;
pStorage->skipRedundantSlices = HANTRO_TRUE;
}
break;
case NAL_SEI:
DEBUG(("SEI MESSAGE, NOT DECODED"));
break;
default:
DEBUG(("NOT IMPLEMENTED YET %d\n",nalUnit.nalUnitType));
}
}
if (picReady)
{
h264bsdFilterPicture(pStorage->currImage, pStorage->mb);
h264bsdResetStorage(pStorage);
picOrderCnt = h264bsdDecodePicOrderCnt(pStorage->poc,
pStorage->activeSps, pStorage->sliceHeader, pStorage->prevNalUnit);
if (pStorage->validSliceInAccessUnit)
{
if (pStorage->prevNalUnit->nalRefIdc)
{
tmp = h264bsdMarkDecRefPic(pStorage->dpb,
&pStorage->sliceHeader->decRefPicMarking,
pStorage->currImage, pStorage->sliceHeader->frameNum,
picOrderCnt,
IS_IDR_NAL_UNIT(pStorage->prevNalUnit) ?
HANTRO_TRUE : HANTRO_FALSE,
pStorage->currentPicId, pStorage->numConcealedMbs);
}
/* non-reference picture, just store for possible display
* reordering */
else
{
tmp = h264bsdMarkDecRefPic(pStorage->dpb, NULL,
pStorage->currImage, pStorage->sliceHeader->frameNum,
picOrderCnt,
IS_IDR_NAL_UNIT(pStorage->prevNalUnit) ?
HANTRO_TRUE : HANTRO_FALSE,
pStorage->currentPicId, pStorage->numConcealedMbs);
}
}
pStorage->picStarted = HANTRO_FALSE;
pStorage->validSliceInAccessUnit = HANTRO_FALSE;
return(H264BSD_PIC_RDY);
}
else
return(H264BSD_RDY);
}
/*------------------------------------------------------------------------------
Function: h264bsdShutdown
Functional description:
Shutdown a decoder instance. Function frees all the memories
allocated for the decoder instance.
Inputs:
pStorage pointer to storage data structure
Returns:
none
------------------------------------------------------------------------------*/
void h264bsdShutdown(storage_t *pStorage)
{
/* Variables */
u32 i;
/* Code */
ASSERT(pStorage);
for (i = 0; i < MAX_NUM_SEQ_PARAM_SETS; i++)
{
if (pStorage->sps[i])
{
FREE(pStorage->sps[i]->offsetForRefFrame);
FREE(pStorage->sps[i]->vuiParameters);
FREE(pStorage->sps[i]);
}
}
for (i = 0; i < MAX_NUM_PIC_PARAM_SETS; i++)
{
if (pStorage->pps[i])
{
FREE(pStorage->pps[i]->runLength);
FREE(pStorage->pps[i]->topLeft);
FREE(pStorage->pps[i]->bottomRight);
FREE(pStorage->pps[i]->sliceGroupId);
FREE(pStorage->pps[i]);
}
}
FREE(pStorage->mbLayer);
FREE(pStorage->mb);
FREE(pStorage->sliceGroupMap);
h264bsdFreeDpb(pStorage->dpb);
}
/*------------------------------------------------------------------------------
Function: h264bsdNextOutputPicture
Functional description:
Get next output picture in display order.
Inputs:
pStorage pointer to storage data structure
Outputs:
picId identifier of the picture will be stored here
isIdrPic IDR flag of the picture will be stored here
numErrMbs number of concealed macroblocks in the picture
will be stored here
Returns:
pointer to the picture data
NULL if no pictures available for display
------------------------------------------------------------------------------*/
u8* h264bsdNextOutputPicture(storage_t *pStorage, u32 *picId, u32 *isIdrPic,
u32 *numErrMbs)
{
/* Variables */
dpbOutPicture_t *pOut;
/* Code */
ASSERT(pStorage);
pOut = h264bsdDpbOutputPicture(pStorage->dpb);
if (pOut != NULL)
{
*picId = pOut->picId;
*isIdrPic = pOut->isIdr;
*numErrMbs = pOut->numErrMbs;
return (pOut->data);
}
else
return(NULL);
}
/*------------------------------------------------------------------------------
Function: h264bsdNextOutputPictureARGB
Functional description:
Get next output picture in display order, converted to ARGB.
Inputs:
pStorage pointer to storage data structure
Outputs:
picId identifier of the picture will be stored here
isIdrPic IDR flag of the picture will be stored here
numErrMbs number of concealed macroblocks in the picture
will be stored here
Returns:
pointer to the picture data
NULL if no pictures available for display
------------------------------------------------------------------------------*/
u32* h264bsdNextOutputPictureARGB(storage_t *pStorage, u32 *picId, u32 *isIdrPic, u32 *numErrMbs)
{
u32 width = h264bsdPicWidth(pStorage) * 16;
u32 height = h264bsdPicHeight(pStorage) * 16;
u8* data = h264bsdNextOutputPicture(pStorage, picId, isIdrPic, numErrMbs);
if(data == NULL) return NULL;
size_t rgbSize = sizeof(u32) * width * height;
if(pStorage->rgbConversionBufferSize < rgbSize)
{
if(pStorage->rgbConversionBuffer != NULL) free(pStorage->rgbConversionBuffer);
pStorage->rgbConversionBufferSize = rgbSize;
pStorage->rgbConversionBuffer = (u32*)malloc(rgbSize);
}
h264bsdConvertToARGB(width, height, data, pStorage->rgbConversionBuffer);
return pStorage->rgbConversionBuffer;
}
/*------------------------------------------------------------------------------
Function: h264bsdPicWidth
Functional description:
Get width of the picture in macroblocks
Inputs:
pStorage pointer to storage data structure
Outputs:
none
Returns:
picture width
0 if parameters sets not yet activated
------------------------------------------------------------------------------*/
u32 h264bsdPicWidth(storage_t *pStorage)
{
/* Variables */
/* Code */
ASSERT(pStorage);
if (pStorage->activeSps)
return(pStorage->activeSps->picWidthInMbs);
else
return(0);
}
/*------------------------------------------------------------------------------
Function: h264bsdPicHeight
Functional description:
Get height of the picture in macroblocks
Inputs:
pStorage pointer to storage data structure
Outputs:
none
Returns:
picture width
0 if parameters sets not yet activated
------------------------------------------------------------------------------*/
u32 h264bsdPicHeight(storage_t *pStorage)
{
/* Variables */
/* Code */
ASSERT(pStorage);
if (pStorage->activeSps)
return(pStorage->activeSps->picHeightInMbs);
else
return(0);
}
/*------------------------------------------------------------------------------
Function: h264bsdFlushBuffer
Functional description:
Flush the decoded picture buffer, see dpb.c for details
Inputs:
pStorage pointer to storage data structure
------------------------------------------------------------------------------*/
void h264bsdFlushBuffer(storage_t *pStorage)
{
/* Variables */
/* Code */
ASSERT(pStorage);
h264bsdFlushDpb(pStorage->dpb);
}
/*------------------------------------------------------------------------------
Function: h264bsdCheckValidParamSets
Functional description:
Check if any valid parameter set combinations (SPS/PPS) exists.
Inputs:
pStorage pointer to storage structure
Returns:
1 at least one valid SPS/PPS combination found
0 no valid param set combinations found
------------------------------------------------------------------------------*/
u32 h264bsdCheckValidParamSets(storage_t *pStorage)
{
/* Variables */
/* Code */
ASSERT(pStorage);
return(h264bsdValidParamSets(pStorage) == HANTRO_OK ? 1 : 0);
}
/*------------------------------------------------------------------------------
Function: h264bsdVideoRange
Functional description:
Get value of video_full_range_flag received in the VUI data.
Inputs:
pStorage pointer to storage structure
Returns:
1 video_full_range_flag received and value is 1
0 otherwise
------------------------------------------------------------------------------*/
u32 h264bsdVideoRange(storage_t *pStorage)
{
/* Variables */
/* Code */
ASSERT(pStorage);
if (pStorage->activeSps && pStorage->activeSps->vuiParametersPresentFlag &&
pStorage->activeSps->vuiParameters &&
pStorage->activeSps->vuiParameters->videoSignalTypePresentFlag &&
pStorage->activeSps->vuiParameters->videoFullRangeFlag)
return(1);
else /* default value of video_full_range_flag is 0 */
return(0);
}
/*------------------------------------------------------------------------------
Function: h264bsdMatrixCoefficients
Functional description:
Get value of matrix_coefficients received in the VUI data
Inputs:
pStorage pointer to storage structure
Outputs:
value of matrix_coefficients if received
2 otherwise (this is the default value)
------------------------------------------------------------------------------*/
u32 h264bsdMatrixCoefficients(storage_t *pStorage)
{
/* Variables */
/* Code */
ASSERT(pStorage);
if (pStorage->activeSps && pStorage->activeSps->vuiParametersPresentFlag &&
pStorage->activeSps->vuiParameters &&
pStorage->activeSps->vuiParameters->videoSignalTypePresentFlag &&
pStorage->activeSps->vuiParameters->colourDescriptionPresentFlag)
return(pStorage->activeSps->vuiParameters->matrixCoefficients);
else /* default unspecified */
return(2);
}
/*------------------------------------------------------------------------------
Function: hh264bsdCroppingParams
Functional description:
Get cropping parameters of the active SPS
Inputs:
pStorage pointer to storage structure
Outputs:
croppingFlag flag indicating if cropping params present is
stored here
leftOffset cropping left offset in pixels is stored here
width width of the image after cropping is stored here
topOffset cropping top offset in pixels is stored here
height height of the image after cropping is stored here
Returns:
none
------------------------------------------------------------------------------*/
void h264bsdCroppingParams(storage_t *pStorage, u32 *croppingFlag,
u32 *leftOffset, u32 *width, u32 *topOffset, u32 *height)
{
/* Variables */
/* Code */
ASSERT(pStorage);
if (pStorage->activeSps && pStorage->activeSps->frameCroppingFlag)
{
*croppingFlag = 1;
*leftOffset = 2 * pStorage->activeSps->frameCropLeftOffset;
*width = 16 * pStorage->activeSps->picWidthInMbs -
2 * (pStorage->activeSps->frameCropLeftOffset +
pStorage->activeSps->frameCropRightOffset);
*topOffset = 2 * pStorage->activeSps->frameCropTopOffset;
*height = 16 * pStorage->activeSps->picHeightInMbs -
2 * (pStorage->activeSps->frameCropTopOffset +
pStorage->activeSps->frameCropBottomOffset);
}
else
{
*croppingFlag = 0;
*leftOffset = 0;
*width = 0;
*topOffset = 0;
*height = 0;
}
}
/*------------------------------------------------------------------------------
Function: h264bsdSampleAspectRatio
Functional description:
Get aspect ratio received in the VUI data
Inputs:
pStorage pointer to storage structure
Outputs:
sarWidth sample aspect ratio height
sarHeight sample aspect ratio width
------------------------------------------------------------------------------*/
void h264bsdSampleAspectRatio(storage_t *pStorage, u32 *sarWidth, u32 *sarHeight)
{
/* Variables */
u32 w = 1;
u32 h = 1;
/* Code */
ASSERT(pStorage);
if (pStorage->activeSps &&
pStorage->activeSps->vuiParametersPresentFlag &&
pStorage->activeSps->vuiParameters &&
pStorage->activeSps->vuiParameters->aspectRatioPresentFlag )
{
switch (pStorage->activeSps->vuiParameters->aspectRatioIdc)
{
case ASPECT_RATIO_UNSPECIFIED: w = 0; h = 0; break;
case ASPECT_RATIO_1_1: w = 1; h = 1; break;
case ASPECT_RATIO_12_11: w = 12; h = 11; break;
case ASPECT_RATIO_10_11: w = 10; h = 11; break;
case ASPECT_RATIO_16_11: w = 16; h = 11; break;
case ASPECT_RATIO_40_33: w = 40; h = 33; break;
case ASPECT_RATIO_24_11: w = 24; h = 11; break;
case ASPECT_RATIO_20_11: w = 20; h = 11; break;
case ASPECT_RATIO_32_11: w = 32; h = 11; break;
case ASPECT_RATIO_80_33: w = 80; h = 33; break;
case ASPECT_RATIO_18_11: w = 18; h = 11; break;
case ASPECT_RATIO_15_11: w = 15; h = 11; break;
case ASPECT_RATIO_64_33: w = 64; h = 33; break;
case ASPECT_RATIO_160_99: w = 160; h = 99; break;
case ASPECT_RATIO_EXTENDED_SAR:
w = pStorage->activeSps->vuiParameters->sarWidth;
h = pStorage->activeSps->vuiParameters->sarHeight;
if ((w == 0) || (h == 0))
w = h = 0;
break;
default:
w = 0;
h = 0;
break;
}
}
/* set aspect ratio*/
*sarWidth = w;
*sarHeight = h;
}
/*------------------------------------------------------------------------------
Function: h264bsdProfile
Functional description:
Get profile information from active SPS
Inputs:
pStorage pointer to storage structure
Outputs:
profile current profile
------------------------------------------------------------------------------*/
u32 h264bsdProfile(storage_t *pStorage)
{
if (pStorage->activeSps)
return pStorage->activeSps->profileIdc;
else
return 0;
}
/*------------------------------------------------------------------------------
Function name: h264bsdAlloc
Functional description:
Allocate storage for a decoder
Inputs:
none
Outputs:
none
Returns:
pStorage pointer to uninitialized storage structure
------------------------------------------------------------------------------*/
storage_t* h264bsdAlloc()
{
return (storage_t*)malloc(sizeof(storage_t));
}
/*------------------------------------------------------------------------------
Function name: h264bsdFree
Functional description:
Free storage for a decoder
Inputs:
pStorage pointer to storage structure
Outputs:
none
Returns:
none
------------------------------------------------------------------------------*/
void h264bsdFree(storage_t *pStorage)
{
free(pStorage);
}
/*------------------------------------------------------------------------------
Function: h264bsdConvertToARGB
Functional description:
Convert decoded image data ARGB format.
ARGB format uses u32 pixels where the MSB is alpha.
*Note* While this function is available, it is not heavily optimized.
If possible, you should use decoded image data directly.
This function should only be used when there is no other way to get ARGB data.
Inputs:
width width of the image in pixels
height height of the image in pixels
data pointer to decoded image data
Outputs:
rgbData pointer to the buffer where the RGB data will be written
Returns:
none
------------------------------------------------------------------------------*/
void h264bsdConvertToARGB(u32 width, u32 height, u8* data, u32 *rgbData)
{
const u32 w = width;
const u32 h = height;
int x = 0;
int y = 0;
size_t ySize = w * h;
size_t uSize = w/2 * h/2;
u8* luma = data;
u8* cb = data + ySize;
u8* cr = data + ySize + uSize;
u32* rgb = rgbData;
while(y < h)
{
int c = *luma - 16;
int d = *cb - 128;
int e = *cr - 128;
u32 r = (u32)CLIP1((298*c + 409*e + 128) >> 8);
u32 g = (u32)CLIP1((298*c - 100*d - 208*e + 128) >> 8);
u32 b = (u32)CLIP1((298*c + 516*d + 128) >> 8);
u32 pixel = 0xff;
pixel = (pixel << 8) & r;
pixel = (pixel << 8) & g;
pixel = (pixel << 8) & b;
*rgb = pixel;
++x;
++rgb;
++luma;
if(!(x & 1))
{
++cb;
++cr;
}
if(x < w) continue;
++y;
if(y & 1)
{
cb -= w;
cr -= w;
}
}
}