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winamp/Src/h264dec/ldecod/src/fmo.c

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/*!
*****************************************************************************
*
* \file fmo.c
*
* \brief
* Support for Flexible Macroblock Ordering (FMO)
*
* \author
* Main contributors (see contributors.h for copyright, address and affiliation details)
* - Stephan Wenger stewe@cs.tu-berlin.de
* - Karsten Suehring suehring@hhi.de
******************************************************************************
*/
#include "global.h"
#include "elements.h"
#include "defines.h"
#include "header.h"
#include "fmo.h"
//#define PRINT_FMO_MAPS
static void FmoGenerateType0MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits );
static void FmoGenerateType1MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits );
static void FmoGenerateType2MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits );
static void FmoGenerateType3MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits );
static void FmoGenerateType4MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits );
static void FmoGenerateType5MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits );
static void FmoGenerateType6MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits );
/*!
************************************************************************
* \brief
* Generates p_Vid->MapUnitToSliceGroupMap
* Has to be called every time a new Picture Parameter Set is used
*
* \param p_Vid
* image encoding parameters for current picture
*
************************************************************************
*/
static int FmoGenerateMapUnitToSliceGroupMap (VideoParameters *p_Vid)
{
seq_parameter_set_rbsp_t* sps = p_Vid->active_sps;
pic_parameter_set_rbsp_t* pps = p_Vid->active_pps;
unsigned int NumSliceGroupMapUnits;
NumSliceGroupMapUnits = (sps->pic_height_in_map_units_minus1+1)* (sps->pic_width_in_mbs_minus1+1);
if (pps->slice_group_map_type == 6)
{
if ((pps->pic_size_in_map_units_minus1 + 1) != NumSliceGroupMapUnits)
{
error ("wrong pps->pic_size_in_map_units_minus1 for used SPS and FMO type 6", 500);
}
}
// allocate memory for p_Vid->MapUnitToSliceGroupMap
if (p_Vid->MapUnitToSliceGroupMap)
free (p_Vid->MapUnitToSliceGroupMap);
if ((p_Vid->MapUnitToSliceGroupMap = malloc ((NumSliceGroupMapUnits) * sizeof (int))) == NULL)
{
printf ("cannot allocated %d bytes for p_Vid->MapUnitToSliceGroupMap, exit\n", (int) ( (pps->pic_size_in_map_units_minus1+1) * sizeof (int)));
exit (-1);
}
if (pps->num_slice_groups_minus1 == 0) // only one slice group
{
memset (p_Vid->MapUnitToSliceGroupMap, 0, NumSliceGroupMapUnits * sizeof (int));
return 0;
}
switch (pps->slice_group_map_type)
{
case 0:
FmoGenerateType0MapUnitMap (p_Vid, NumSliceGroupMapUnits);
break;
case 1:
FmoGenerateType1MapUnitMap (p_Vid, NumSliceGroupMapUnits);
break;
case 2:
FmoGenerateType2MapUnitMap (p_Vid, NumSliceGroupMapUnits);
break;
case 3:
FmoGenerateType3MapUnitMap (p_Vid, NumSliceGroupMapUnits);
break;
case 4:
FmoGenerateType4MapUnitMap (p_Vid, NumSliceGroupMapUnits);
break;
case 5:
FmoGenerateType5MapUnitMap (p_Vid, NumSliceGroupMapUnits);
break;
case 6:
FmoGenerateType6MapUnitMap (p_Vid, NumSliceGroupMapUnits);
break;
default:
printf ("Illegal slice_group_map_type %d , exit \n", (int) pps->slice_group_map_type);
exit (-1);
}
return 0;
}
/*!
************************************************************************
* \brief
* Generates p_Vid->MbToSliceGroupMap from p_Vid->MapUnitToSliceGroupMap
*
* \param p_Vid
* image encoding parameters for current picture
*
************************************************************************
*/
static int FmoGenerateMbToSliceGroupMap (VideoParameters *p_Vid)
{
seq_parameter_set_rbsp_t* sps = p_Vid->active_sps;
unsigned i;
// allocate memory for p_Vid->MbToSliceGroupMap
if (p_Vid->MbToSliceGroupMap)
free (p_Vid->MbToSliceGroupMap);
if ((p_Vid->MbToSliceGroupMap = malloc ((p_Vid->PicSizeInMbs) * sizeof (int))) == NULL)
{
printf ("cannot allocate %d bytes for p_Vid->MbToSliceGroupMap, exit\n", (int) ((p_Vid->PicSizeInMbs) * sizeof (int)));
exit (-1);
}
if ((sps->frame_mbs_only_flag)|| p_Vid->field_pic_flag)
{
for (i=0; i<p_Vid->PicSizeInMbs; i++)
{
p_Vid->MbToSliceGroupMap[i] = p_Vid->MapUnitToSliceGroupMap[i];
}
}
else
if (sps->mb_adaptive_frame_field_flag && (!p_Vid->field_pic_flag))
{
for (i=0; i<p_Vid->PicSizeInMbs; i++)
{
p_Vid->MbToSliceGroupMap[i] = p_Vid->MapUnitToSliceGroupMap[i/2];
}
}
else
{
for (i=0; i<p_Vid->PicSizeInMbs; i++)
{
p_Vid->MbToSliceGroupMap[i] = p_Vid->MapUnitToSliceGroupMap[(i/(2*p_Vid->PicWidthInMbs))*p_Vid->PicWidthInMbs+(i%p_Vid->PicWidthInMbs)];
}
}
return 0;
}
/*!
************************************************************************
* \brief
* FMO initialization: Generates p_Vid->MapUnitToSliceGroupMap and p_Vid->MbToSliceGroupMap.
*
* \param p_Vid
* image encoding parameters for current picture
************************************************************************
*/
int fmo_init(VideoParameters *p_Vid)
{
pic_parameter_set_rbsp_t* pps = p_Vid->active_pps;
#ifdef PRINT_FMO_MAPS
unsigned i,j;
#endif
FmoGenerateMapUnitToSliceGroupMap(p_Vid);
FmoGenerateMbToSliceGroupMap(p_Vid);
p_Vid->NumberOfSliceGroups = pps->num_slice_groups_minus1 + 1;
#ifdef PRINT_FMO_MAPS
printf("\n");
printf("FMO Map (Units):\n");
for (j=0; j<p_Vid->PicHeightInMapUnits; j++)
{
for (i=0; i<p_Vid->PicWidthInMbs; i++)
{
printf("%c",48+p_Vid->MapUnitToSliceGroupMap[i+j*p_Vid->PicWidthInMbs]);
}
printf("\n");
}
printf("\n");
printf("FMO Map (Mb):\n");
for (j=0; j<p_Vid->PicHeightInMbs; j++)
{
for (i=0; i<p_Vid->PicWidthInMbs; i++)
{
printf("%c",48 + p_Vid->MbToSliceGroupMap[i + j * p_Vid->PicWidthInMbs]);
}
printf("\n");
}
printf("\n");
#endif
return 0;
}
/*!
************************************************************************
* \brief
* Free memory allocated by FMO functions
************************************************************************
*/
int FmoFinit(VideoParameters *p_Vid)
{
if (p_Vid->MbToSliceGroupMap)
{
free (p_Vid->MbToSliceGroupMap);
p_Vid->MbToSliceGroupMap = NULL;
}
if (p_Vid->MapUnitToSliceGroupMap)
{
free (p_Vid->MapUnitToSliceGroupMap);
p_Vid->MapUnitToSliceGroupMap = NULL;
}
return 0;
}
/*!
************************************************************************
* \brief
* FmoGetNumberOfSliceGroup(p_Vid)
*
* \par p_Vid:
* VideoParameters
************************************************************************
*/
int FmoGetNumberOfSliceGroup(VideoParameters *p_Vid)
{
return p_Vid->NumberOfSliceGroups;
}
/*!
************************************************************************
* \brief
* FmoGetLastMBOfPicture(p_Vid)
* returns the macroblock number of the last MB in a picture. This
* mb happens to be the last macroblock of the picture if there is only
* one slice group
*
* \par Input:
* None
************************************************************************
*/
int FmoGetLastMBOfPicture(VideoParameters *p_Vid)
{
return FmoGetLastMBInSliceGroup (p_Vid, FmoGetNumberOfSliceGroup(p_Vid)-1);
}
/*!
************************************************************************
* \brief
* FmoGetLastMBInSliceGroup: Returns MB number of last MB in SG
*
* \par Input:
* SliceGroupID (0 to 7)
************************************************************************
*/
int FmoGetLastMBInSliceGroup (VideoParameters *p_Vid, int SliceGroup)
{
int i;
for (i=p_Vid->PicSizeInMbs-1; i>=0; i--)
if (FmoGetSliceGroupId (p_Vid, i) == SliceGroup)
return i;
return -1;
}
/*!
************************************************************************
* \brief
* Returns SliceGroupID for a given MB
*
* \param p_Vid
* image encoding parameters for current picture
* \param mb
* Macroblock number (in scan order)
************************************************************************
*/
int FmoGetSliceGroupId (VideoParameters *p_Vid, int mb)
{
assert (mb < (int) p_Vid->PicSizeInMbs);
assert (p_Vid->MbToSliceGroupMap != NULL);
return p_Vid->MbToSliceGroupMap[mb];
}
/*!
************************************************************************
* \brief
* FmoGetNextMBBr: Returns the MB-Nr (in scan order) of the next
* MB in the (scattered) Slice, -1 if the slice is finished
* \param p_Vid
* image encoding parameters for current picture
*
* \param CurrentMbNr
* number of the current macroblock
************************************************************************
*/
int FmoGetNextMBNr (VideoParameters *p_Vid, int CurrentMbNr)
{
int SliceGroup = FmoGetSliceGroupId (p_Vid, CurrentMbNr);
while (++CurrentMbNr<(int)p_Vid->PicSizeInMbs && p_Vid->MbToSliceGroupMap [CurrentMbNr] != SliceGroup)
;
if (CurrentMbNr >= (int)p_Vid->PicSizeInMbs)
return -1; // No further MB in this slice (could be end of picture)
else
return CurrentMbNr;
}
/*!
************************************************************************
* \brief
* Generate interleaved slice group map type MapUnit map (type 0)
*
************************************************************************
*/
static void FmoGenerateType0MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits )
{
pic_parameter_set_rbsp_t* pps = p_Vid->active_pps;
unsigned iGroup, j;
unsigned i = 0;
do
{
for( iGroup = 0;
(iGroup <= pps->num_slice_groups_minus1) && (i < PicSizeInMapUnits);
i += pps->run_length_minus1[iGroup++] + 1 )
{
for( j = 0; j <= pps->run_length_minus1[ iGroup ] && i + j < PicSizeInMapUnits; j++ )
p_Vid->MapUnitToSliceGroupMap[i+j] = iGroup;
}
}
while( i < PicSizeInMapUnits );
}
/*!
************************************************************************
* \brief
* Generate dispersed slice group map type MapUnit map (type 1)
*
************************************************************************
*/
static void FmoGenerateType1MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits )
{
pic_parameter_set_rbsp_t* pps = p_Vid->active_pps;
unsigned i;
for( i = 0; i < PicSizeInMapUnits; i++ )
{
p_Vid->MapUnitToSliceGroupMap[i] = ((i%p_Vid->PicWidthInMbs)+(((i/p_Vid->PicWidthInMbs)*(pps->num_slice_groups_minus1+1))/2))
%(pps->num_slice_groups_minus1+1);
}
}
/*!
************************************************************************
* \brief
* Generate foreground with left-over slice group map type MapUnit map (type 2)
*
************************************************************************
*/
static void FmoGenerateType2MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits )
{
pic_parameter_set_rbsp_t* pps = p_Vid->active_pps;
int iGroup;
unsigned i, x, y;
unsigned yTopLeft, xTopLeft, yBottomRight, xBottomRight;
for( i = 0; i < PicSizeInMapUnits; i++ )
p_Vid->MapUnitToSliceGroupMap[ i ] = pps->num_slice_groups_minus1;
for( iGroup = pps->num_slice_groups_minus1 - 1 ; iGroup >= 0; iGroup-- )
{
yTopLeft = pps->top_left[ iGroup ] / p_Vid->PicWidthInMbs;
xTopLeft = pps->top_left[ iGroup ] % p_Vid->PicWidthInMbs;
yBottomRight = pps->bottom_right[ iGroup ] / p_Vid->PicWidthInMbs;
xBottomRight = pps->bottom_right[ iGroup ] % p_Vid->PicWidthInMbs;
for( y = yTopLeft; y <= yBottomRight; y++ )
for( x = xTopLeft; x <= xBottomRight; x++ )
p_Vid->MapUnitToSliceGroupMap[ y * p_Vid->PicWidthInMbs + x ] = iGroup;
}
}
/*!
************************************************************************
* \brief
* Generate box-out slice group map type MapUnit map (type 3)
*
************************************************************************
*/
static void FmoGenerateType3MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits )
{
pic_parameter_set_rbsp_t* pps = p_Vid->active_pps;
unsigned i, k;
int leftBound, topBound, rightBound, bottomBound;
int x, y, xDir, yDir;
int mapUnitVacant;
unsigned mapUnitsInSliceGroup0 = imin((pps->slice_group_change_rate_minus1 + 1) * p_Vid->slice_group_change_cycle, PicSizeInMapUnits);
for( i = 0; i < PicSizeInMapUnits; i++ )
p_Vid->MapUnitToSliceGroupMap[ i ] = 2;
x = ( p_Vid->PicWidthInMbs - pps->slice_group_change_direction_flag ) / 2;
y = ( p_Vid->PicHeightInMapUnits - pps->slice_group_change_direction_flag ) / 2;
leftBound = x;
topBound = y;
rightBound = x;
bottomBound = y;
xDir = pps->slice_group_change_direction_flag - 1;
yDir = pps->slice_group_change_direction_flag;
for( k = 0; k < PicSizeInMapUnits; k += mapUnitVacant )
{
mapUnitVacant = ( p_Vid->MapUnitToSliceGroupMap[ y * p_Vid->PicWidthInMbs + x ] == 2 );
if( mapUnitVacant )
p_Vid->MapUnitToSliceGroupMap[ y * p_Vid->PicWidthInMbs + x ] = ( k >= mapUnitsInSliceGroup0 );
if( xDir == -1 && x == leftBound )
{
leftBound = imax( leftBound - 1, 0 );
x = leftBound;
xDir = 0;
yDir = 2 * pps->slice_group_change_direction_flag - 1;
}
else
if( xDir == 1 && x == rightBound )
{
rightBound = imin( rightBound + 1, (int)p_Vid->PicWidthInMbs - 1 );
x = rightBound;
xDir = 0;
yDir = 1 - 2 * pps->slice_group_change_direction_flag;
}
else
if( yDir == -1 && y == topBound )
{
topBound = imax( topBound - 1, 0 );
y = topBound;
xDir = 1 - 2 * pps->slice_group_change_direction_flag;
yDir = 0;
}
else
if( yDir == 1 && y == bottomBound )
{
bottomBound = imin( bottomBound + 1, (int)p_Vid->PicHeightInMapUnits - 1 );
y = bottomBound;
xDir = 2 * pps->slice_group_change_direction_flag - 1;
yDir = 0;
}
else
{
x = x + xDir;
y = y + yDir;
}
}
}
/*!
************************************************************************
* \brief
* Generate raster scan slice group map type MapUnit map (type 4)
*
************************************************************************
*/
static void FmoGenerateType4MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits )
{
pic_parameter_set_rbsp_t* pps = p_Vid->active_pps;
unsigned mapUnitsInSliceGroup0 = imin((pps->slice_group_change_rate_minus1 + 1) * p_Vid->slice_group_change_cycle, PicSizeInMapUnits);
unsigned sizeOfUpperLeftGroup = pps->slice_group_change_direction_flag ? ( PicSizeInMapUnits - mapUnitsInSliceGroup0 ) : mapUnitsInSliceGroup0;
unsigned i;
for( i = 0; i < PicSizeInMapUnits; i++ )
if( i < sizeOfUpperLeftGroup )
p_Vid->MapUnitToSliceGroupMap[ i ] = pps->slice_group_change_direction_flag;
else
p_Vid->MapUnitToSliceGroupMap[ i ] = 1 - pps->slice_group_change_direction_flag;
}
/*!
************************************************************************
* \brief
* Generate wipe slice group map type MapUnit map (type 5)
*
************************************************************************
*/
static void FmoGenerateType5MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits )
{
pic_parameter_set_rbsp_t* pps = p_Vid->active_pps;
unsigned mapUnitsInSliceGroup0 = imin((pps->slice_group_change_rate_minus1 + 1) * p_Vid->slice_group_change_cycle, PicSizeInMapUnits);
unsigned sizeOfUpperLeftGroup = pps->slice_group_change_direction_flag ? ( PicSizeInMapUnits - mapUnitsInSliceGroup0 ) : mapUnitsInSliceGroup0;
unsigned i,j, k = 0;
for( j = 0; j < p_Vid->PicWidthInMbs; j++ )
for( i = 0; i < p_Vid->PicHeightInMapUnits; i++ )
if( k++ < sizeOfUpperLeftGroup )
p_Vid->MapUnitToSliceGroupMap[ i * p_Vid->PicWidthInMbs + j ] = pps->slice_group_change_direction_flag;
else
p_Vid->MapUnitToSliceGroupMap[ i * p_Vid->PicWidthInMbs + j ] = 1 - pps->slice_group_change_direction_flag;
}
/*!
************************************************************************
* \brief
* Generate explicit slice group map type MapUnit map (type 6)
*
************************************************************************
*/
static void FmoGenerateType6MapUnitMap (VideoParameters *p_Vid, unsigned PicSizeInMapUnits )
{
pic_parameter_set_rbsp_t* pps = p_Vid->active_pps;
unsigned i;
for (i=0; i<PicSizeInMapUnits; i++)
{
p_Vid->MapUnitToSliceGroupMap[i] = pps->slice_group_id[i];
}
}
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