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/************************************************************************** |
/***************************************************************************** |
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* |
* |
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* XVID MPEG-4 VIDEO CODEC |
* XVID MPEG-4 VIDEO CODEC |
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* mpeg-4 quantization/dequantization |
* - Mpeg4 quantization/dequantization functions - |
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* |
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* Copyright(C) 2002 Peter Ross <pross@xvid.org> |
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* |
* |
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* This program is an implementation of a part of one or more MPEG-4 |
* This program is an implementation of a part of one or more MPEG-4 |
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* Video tools as specified in ISO/IEC 14496-2 standard. Those intending |
* Video tools as specified in ISO/IEC 14496-2 standard. Those intending |
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* |
* |
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* You should have received a copy of the GNU General Public License |
* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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*************************************************************************/ |
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/************************************************************************** |
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* |
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* History: |
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* |
* |
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* 26.01.2002 fixed quant4_intra dcscalar signed/unsigned error |
* $Id: quant_mpeg4.c,v 1.5 2002-09-21 03:07:56 suxen_drol Exp $ |
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* 20.01.2002 increased accuracy of >> divide |
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* 26.12.2001 divide-by-multiplication optimization |
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* 22.12.2001 [-127,127] clamping removed; minor tweaks |
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* 19.11.2001 inital version <pross@cs.rmit.edu.au> |
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* |
* |
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*************************************************************************/ |
****************************************************************************/ |
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#include "quant_mpeg4.h" |
#include "quant_mpeg4.h" |
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#include "quant_matrix.h" |
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/***************************************************************************** |
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* Function pointers |
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****************************************************************************/ |
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// function pointers |
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quant_intraFuncPtr quant4_intra; |
quant_intraFuncPtr quant4_intra; |
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quant_intraFuncPtr dequant4_intra; |
quant_intraFuncPtr dequant4_intra; |
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dequant_interFuncPtr dequant4_inter; |
dequant_interFuncPtr dequant4_inter; |
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quant_interFuncPtr quant4_inter; |
quant_interFuncPtr quant4_inter; |
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/***************************************************************************** |
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* Local data |
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****************************************************************************/ |
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#define DIV_DIV(A,B) ( (A) > 0 ? ((A)+((B)>>1))/(B) : ((A)-((B)>>1))/(B) ) |
#define DIV_DIV(A,B) ( (A) > 0 ? ((A)+((B)>>1))/(B) : ((A)-((B)>>1))/(B) ) |
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#define SIGN(A) ((A)>0?1:-1) |
#define SIGN(A) ((A)>0?1:-1) |
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#define VM18P 3 |
#define VM18P 3 |
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#define VM18Q 4 |
#define VM18Q 4 |
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// divide-by-multiply table |
/* |
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// need 17 bit shift (16 causes slight errors when q > 19) |
* divide-by-multiply table |
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* need 17 bit shift (16 causes slight errors when q > 19) |
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*/ |
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#define SCALEBITS 17 |
#define SCALEBITS 17 |
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#define FIX(X) ((1UL << SCALEBITS) / (X) + 1) |
#define FIX(X) ((1UL << SCALEBITS) / (X) + 1) |
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static const uint32_t multipliers[32] = |
static const uint32_t multipliers[32] = { |
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{ |
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0, FIX(2), FIX(4), FIX(6), |
0, FIX(2), FIX(4), FIX(6), |
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FIX(8), FIX(10), FIX(12), FIX(14), |
FIX(8), FIX(10), FIX(12), FIX(14), |
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FIX(16), FIX(18), FIX(20), FIX(22), |
FIX(16), FIX(18), FIX(20), FIX(22), |
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FIX(56), FIX(58), FIX(60), FIX(62) |
FIX(56), FIX(58), FIX(60), FIX(62) |
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}; |
}; |
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/***************************************************************************** |
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static const int16_t default_intra_matrix[64] = { |
* Functions |
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8,17,18,19,21,23,25,27, |
****************************************************************************/ |
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17,18,19,21,23,25,27,28, |
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20,21,22,23,24,26,28,30, |
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21,22,23,24,26,28,30,32, |
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22,23,24,26,28,30,32,35, |
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23,24,26,28,30,32,35,38, |
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25,26,28,30,32,35,38,41, |
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27,28,30,32,35,38,41,45 |
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}; |
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static const int16_t default_inter_matrix[64] = { |
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16,17,18,19,20,21,22,23, |
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17,18,19,20,21,22,23,24, |
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18,19,20,21,22,23,24,25, |
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19,20,21,22,23,24,26,27, |
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20,21,22,23,25,26,27,28, |
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21,22,23,24,26,27,28,30, |
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22,23,24,26,27,28,30,31, |
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23,24,25,27,28,30,31,33 |
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}; |
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/* quantize intra-block |
/* quantize intra-block |
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// coeff[i] = (level + quantd) / quant2; |
// coeff[i] = (level + quantd) / quant2; |
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*/ |
*/ |
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void quant4_intra_c(int16_t * coeff, const int16_t * data, const uint32_t quant, const uint32_t dcscalar) |
void |
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quant4_intra_c(int16_t * coeff, |
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const int16_t * data, |
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const uint32_t quant, |
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const uint32_t dcscalar) |
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{ |
{ |
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const uint32_t quantd = ((VM18P*quant) + (VM18Q/2)) / VM18Q; |
const uint32_t quantd = ((VM18P*quant) + (VM18Q/2)) / VM18Q; |
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const uint32_t mult = multipliers[quant]; |
const uint32_t mult = multipliers[quant]; |
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uint32_t i; |
uint32_t i; |
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int16_t *intra_matrix; |
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intra_matrix = get_intra_matrix(); |
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coeff[0] = DIV_DIV(data[0], (int32_t)dcscalar); |
coeff[0] = DIV_DIV(data[0], (int32_t)dcscalar); |
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for (i = 1; i < 64; i++) |
for (i = 1; i < 64; i++) { |
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{ |
if (data[i] < 0) { |
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if (data[i] < 0) |
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{ |
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uint32_t level = -data[i]; |
uint32_t level = -data[i]; |
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level = ((level<<4) + (default_intra_matrix[i]>>1)) / default_intra_matrix[i]; |
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level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i]; |
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level = ((level + quantd) * mult) >> 17; |
level = ((level + quantd) * mult) >> 17; |
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coeff[i] = -(int16_t)level; |
coeff[i] = -(int16_t)level; |
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} |
} else if (data[i] > 0) { |
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else if (data[i] > 0) |
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{ |
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uint32_t level = data[i]; |
uint32_t level = data[i]; |
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level = ((level<<4) + (default_intra_matrix[i]>>1)) / default_intra_matrix[i]; |
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level = ((level << 4) + (intra_matrix[i] >> 1)) / intra_matrix[i]; |
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level = ((level + quantd) * mult) >> 17; |
level = ((level + quantd) * mult) >> 17; |
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coeff[i] = level; |
coeff[i] = level; |
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} |
} else { |
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else |
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{ |
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coeff[i] = 0; |
coeff[i] = 0; |
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} |
} |
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} |
} |
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// data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; |
// data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; |
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*/ |
*/ |
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void dequant4_intra_c(int16_t *data, const int16_t *coeff, const uint32_t quant, const uint32_t dcscalar) |
void |
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dequant4_intra_c(int16_t * data, |
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const int16_t * coeff, |
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const uint32_t quant, |
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const uint32_t dcscalar) |
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{ |
{ |
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uint32_t i; |
uint32_t i; |
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int16_t *intra_matrix; |
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intra_matrix = get_intra_matrix(); |
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data[0] = coeff[0] * dcscalar; |
data[0] = coeff[0] * dcscalar; |
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if (data[0] < -2048) |
if (data[0] < -2048) { |
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{ |
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data[0] = -2048; |
data[0] = -2048; |
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} |
} else if (data[0] > 2047) { |
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else if (data[0] > 2047) |
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{ |
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data[0] = 2047; |
data[0] = 2047; |
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} |
} |
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for (i = 1; i < 64; i++) |
for (i = 1; i < 64; i++) { |
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{ |
if (coeff[i] == 0) { |
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if (coeff[i] == 0) |
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{ |
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data[i] = 0; |
data[i] = 0; |
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} |
} else if (coeff[i] < 0) { |
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else if (coeff[i] < 0) |
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{ |
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uint32_t level = -coeff[i]; |
uint32_t level = -coeff[i]; |
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level = (level * default_intra_matrix[i] * quant) >> 3; |
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level = (level * intra_matrix[i] * quant) >> 3; |
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data[i] = (level <= 2048 ? -(int16_t)level : -2048); |
data[i] = (level <= 2048 ? -(int16_t)level : -2048); |
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} |
} else // if (coeff[i] > 0) |
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else // if (coeff[i] > 0) |
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{ |
{ |
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uint32_t level = coeff[i]; |
uint32_t level = coeff[i]; |
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level = (level * default_intra_matrix[i] * quant) >> 3; |
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level = (level * intra_matrix[i] * quant) >> 3; |
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data[i] = (level <= 2047 ? level : 2047); |
data[i] = (level <= 2047 ? level : 2047); |
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} |
} |
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} |
} |
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// sum += abs(level); |
// sum += abs(level); |
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*/ |
*/ |
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uint32_t quant4_inter_c(int16_t * coeff, const int16_t * data, const uint32_t quant) |
uint32_t |
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quant4_inter_c(int16_t * coeff, |
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const int16_t * data, |
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const uint32_t quant) |
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{ |
{ |
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const uint32_t mult = multipliers[quant]; |
const uint32_t mult = multipliers[quant]; |
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uint32_t sum = 0; |
uint32_t sum = 0; |
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uint32_t i; |
uint32_t i; |
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int16_t *inter_matrix; |
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for (i = 0; i < 64; i++) |
inter_matrix = get_inter_matrix(); |
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{ |
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if (data[i] < 0) |
for (i = 0; i < 64; i++) { |
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{ |
if (data[i] < 0) { |
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uint32_t level = -data[i]; |
uint32_t level = -data[i]; |
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level = ((level<<4) + (default_inter_matrix[i]>>1)) / default_inter_matrix[i]; |
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level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; |
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level = (level * mult) >> 17; |
level = (level * mult) >> 17; |
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sum += level; |
sum += level; |
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coeff[i] = -(int16_t)level; |
coeff[i] = -(int16_t)level; |
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} |
} else if (data[i] > 0) { |
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else if (data[i] > 0) |
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{ |
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uint32_t level = data[i]; |
uint32_t level = data[i]; |
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level = ((level<<4) + (default_inter_matrix[i]>>1)) / default_inter_matrix[i]; |
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level = ((level << 4) + (inter_matrix[i] >> 1)) / inter_matrix[i]; |
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level = (level * mult) >> 17; |
level = (level * mult) >> 17; |
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sum += level; |
sum += level; |
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coeff[i] = level; |
coeff[i] = level; |
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} |
} else { |
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else |
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{ |
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coeff[i] = 0; |
coeff[i] = 0; |
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} |
} |
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} |
} |
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data = ((2 * coeff + SIGN(coeff)) * inter_matrix[i] * quant) / 16 |
data = ((2 * coeff + SIGN(coeff)) * inter_matrix[i] * quant) / 16 |
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*/ |
*/ |
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void dequant4_inter_c(int16_t *data, const int16_t *coeff, const uint32_t quant) |
void |
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dequant4_inter_c(int16_t * data, |
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const int16_t * coeff, |
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const uint32_t quant) |
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{ |
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uint32_t sum = 0; |
uint32_t sum = 0; |
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uint32_t i; |
uint32_t i; |
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int16_t *inter_matrix; |
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for (i = 0; i < 64; i++) |
inter_matrix = get_inter_matrix(); |
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{ |
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if (coeff[i] == 0) |
for (i = 0; i < 64; i++) { |
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{ |
if (coeff[i] == 0) { |
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data[i] = 0; |
data[i] = 0; |
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} |
} else if (coeff[i] < 0) { |
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else if (coeff[i] < 0) |
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{ |
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int32_t level = -coeff[i]; |
int32_t level = -coeff[i]; |
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level = ((2 * level + 1) * default_inter_matrix[i] * quant) >> 4; |
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level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; |
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data[i] = (level <= 2048 ? -level : -2048); |
data[i] = (level <= 2048 ? -level : -2048); |
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} |
} else // if (coeff[i] > 0) |
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else // if (coeff[i] > 0) |
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{ |
{ |
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uint32_t level = coeff[i]; |
uint32_t level = coeff[i]; |
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level = ((2 * level + 1) * default_inter_matrix[i] * quant) >> 4; |
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level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; |
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data[i] = (level <= 2047 ? level : 2047); |
data[i] = (level <= 2047 ? level : 2047); |
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} |
} |
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// mismatch control |
// mismatch control |
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if ((sum & 1) == 0) |
if ((sum & 1) == 0) { |
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{ |
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data[63] ^= 1; |
data[63] ^= 1; |
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} |
} |
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} |
} |