44 |
#include "quant_mpeg4.h" |
#include "quant_mpeg4.h" |
45 |
#include "quant_matrix.h" |
#include "quant_matrix.h" |
46 |
|
|
47 |
// function pointers |
/* function pointers */ |
48 |
quant_intraFuncPtr quant4_intra; |
quant_intraFuncPtr quant4_intra; |
49 |
quant_intraFuncPtr dequant4_intra; |
quant_intraFuncPtr dequant4_intra; |
50 |
dequant_interFuncPtr dequant4_inter; |
dequant_interFuncPtr dequant4_inter; |
55 |
#define VM18Q 4 |
#define VM18Q 4 |
56 |
|
|
57 |
|
|
58 |
// divide-by-multiply table |
/* |
59 |
// need 17 bit shift (16 causes slight errors when q > 19) |
* divide-by-multiply table |
60 |
|
* need 17 bit shift (16 causes slight errors when q > 19) |
61 |
|
*/ |
62 |
|
|
63 |
#define SCALEBITS 17 |
#define SCALEBITS 17 |
64 |
#define FIX(X) ((1UL << SCALEBITS) / (X) + 1) |
#define FIX(X) ((1UL << SCALEBITS) / (X) + 1) |
75 |
}; |
}; |
76 |
|
|
77 |
/* quantize intra-block |
/* quantize intra-block |
78 |
|
* |
79 |
// const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q); |
* const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q); |
80 |
// |
* level = DIV_DIV(16 * data[i], default_intra_matrix[i]); |
81 |
// level = DIV_DIV(16 * data[i], default_intra_matrix[i]); |
* coeff[i] = (level + quantd) / quant2; |
|
// coeff[i] = (level + quantd) / quant2; |
|
82 |
*/ |
*/ |
83 |
|
|
84 |
void |
void |
117 |
|
|
118 |
|
|
119 |
|
|
120 |
/* dequantize intra-block & clamp to [-2048,2047] |
/* |
121 |
// data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; |
* dequantize intra-block & clamp to [-2048,2047] |
122 |
|
* |
123 |
|
* data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; |
124 |
*/ |
*/ |
125 |
|
|
126 |
void |
void |
149 |
|
|
150 |
level = (level * intra_matrix[i] * quant) >> 3; |
level = (level * intra_matrix[i] * quant) >> 3; |
151 |
data[i] = (level <= 2048 ? -(int16_t) level : -2048); |
data[i] = (level <= 2048 ? -(int16_t) level : -2048); |
152 |
} else // if (coeff[i] > 0) |
} else /* if (coeff[i] > 0) */ |
153 |
{ |
{ |
154 |
uint32_t level = coeff[i]; |
uint32_t level = coeff[i]; |
155 |
|
|
162 |
|
|
163 |
|
|
164 |
/* quantize inter-block |
/* quantize inter-block |
165 |
|
* |
166 |
// level = DIV_DIV(16 * data[i], default_intra_matrix[i]); |
* level = DIV_DIV(16 * data[i], default_intra_matrix[i]); |
167 |
// coeff[i] = (level + quantd) / quant2; |
* coeff[i] = (level + quantd) / quant2; |
168 |
// sum += abs(level); |
* sum += abs(level); |
169 |
*/ |
*/ |
170 |
|
|
171 |
uint32_t |
uint32_t |
227 |
|
|
228 |
level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; |
level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; |
229 |
data[i] = (level <= 2048 ? -level : -2048); |
data[i] = (level <= 2048 ? -level : -2048); |
230 |
} else // if (coeff[i] > 0) |
} else /* if (coeff[i] > 0) */ |
231 |
{ |
{ |
232 |
uint32_t level = coeff[i]; |
uint32_t level = coeff[i]; |
233 |
|
|
238 |
sum ^= data[i]; |
sum ^= data[i]; |
239 |
} |
} |
240 |
|
|
241 |
// mismatch control |
/* mismatch control */ |
242 |
|
|
243 |
if ((sum & 1) == 0) { |
if ((sum & 1) == 0) { |
244 |
data[63] ^= 1; |
data[63] ^= 1; |