67 |
uint32_t current_quant, |
uint32_t current_quant, |
68 |
int32_t iDcScaler, |
int32_t iDcScaler, |
69 |
int16_t predictors[8], |
int16_t predictors[8], |
70 |
const int bound, |
const int bound) |
|
const int bsversion) |
|
71 |
|
|
72 |
{ |
{ |
73 |
const int mbpos = (y * mb_width) + x; |
const int mbpos = (y * mb_width) + x; |
186 |
|
|
187 |
/* determine ac prediction direction & ac/dc predictor place rescaled ac/dc |
/* determine ac prediction direction & ac/dc predictor place rescaled ac/dc |
188 |
* predictions into predictors[] for later use */ |
* predictions into predictors[] for later use */ |
|
|
|
|
/* Workaround: Bitstream versions <= 32 used to have a wrong predictor |
|
|
* stored as it wasn't clipped to the [-2048, 2047] range. We only |
|
|
* use the right predictors for bs versions > 32 */ |
|
|
#define BUGGY_CLIPPING_BS_VERSION 32 |
|
189 |
if (abs(pLeft[0] - pDiag[0]) < abs(pDiag[0] - pTop[0])) { |
if (abs(pLeft[0] - pDiag[0]) < abs(pDiag[0] - pTop[0])) { |
190 |
*acpred_direction = 1; /* vertical */ |
*acpred_direction = 1; /* vertical */ |
191 |
predictors[0] = DIV_DIV(pTop[0], iDcScaler); |
predictors[0] = DIV_DIV(pTop[0], iDcScaler); |
|
if (bsversion == 0 || bsversion > BUGGY_CLIPPING_BS_VERSION) |
|
|
predictors[0] = CLIP(predictors[0], -2048, 2047); |
|
192 |
for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
193 |
predictors[i] = rescale(top_quant, current_quant, pTop[i]); |
predictors[i] = rescale(top_quant, current_quant, pTop[i]); |
194 |
} |
} |
195 |
} else { |
} else { |
196 |
*acpred_direction = 2; /* horizontal */ |
*acpred_direction = 2; /* horizontal */ |
197 |
predictors[0] = DIV_DIV(pLeft[0], iDcScaler); |
predictors[0] = DIV_DIV(pLeft[0], iDcScaler); |
|
if (bsversion == 0 || bsversion > BUGGY_CLIPPING_BS_VERSION) |
|
|
predictors[0] = CLIP(predictors[0], -2048, 2047); |
|
198 |
for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
199 |
predictors[i] = rescale(left_quant, current_quant, pLeft[i + 7]); |
predictors[i] = rescale(left_quant, current_quant, pLeft[i + 7]); |
200 |
} |
} |
206 |
store current coeffs to pred_values[] for future prediction |
store current coeffs to pred_values[] for future prediction |
207 |
*/ |
*/ |
208 |
|
|
209 |
|
/* Up to this version, no DC clipping was performed, so we try to be backward |
210 |
|
* compatible to avoid artifacts */ |
211 |
|
#define BS_VERSION_BUGGY_DC_CLIPPING 34 |
212 |
|
|
213 |
void |
void |
214 |
add_acdc(MACROBLOCK * pMB, |
add_acdc(MACROBLOCK * pMB, |
215 |
uint32_t block, |
uint32_t block, |
216 |
int16_t dct_codes[64], |
int16_t dct_codes[64], |
217 |
uint32_t iDcScaler, |
uint32_t iDcScaler, |
218 |
int16_t predictors[8]) |
int16_t predictors[8], |
219 |
|
const int bsversion) |
220 |
{ |
{ |
221 |
uint8_t acpred_direction = pMB->acpred_directions[block]; |
uint8_t acpred_direction = pMB->acpred_directions[block]; |
222 |
int16_t *pCurrent = pMB->pred_values[block]; |
int16_t *pCurrent = pMB->pred_values[block]; |
226 |
|
|
227 |
dct_codes[0] += predictors[0]; /* dc prediction */ |
dct_codes[0] += predictors[0]; /* dc prediction */ |
228 |
pCurrent[0] = dct_codes[0] * iDcScaler; |
pCurrent[0] = dct_codes[0] * iDcScaler; |
229 |
|
if (!bsversion || bsversion > BS_VERSION_BUGGY_DC_CLIPPING) { |
230 |
|
pCurrent[0] = CLIP(pCurrent[0], -2048, 2047); |
231 |
|
} |
232 |
|
|
233 |
if (acpred_direction == 1) { |
if (acpred_direction == 1) { |
234 |
for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
285 |
/* store current coeffs to pred_values[] for future prediction */ |
/* store current coeffs to pred_values[] for future prediction */ |
286 |
|
|
287 |
pCurrent[0] = qcoeff[0] * iDcScaler; |
pCurrent[0] = qcoeff[0] * iDcScaler; |
288 |
|
pCurrent[0] = CLIP(pCurrent[0], -2048, 2047); |
289 |
for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
290 |
pCurrent[i] = qcoeff[i]; |
pCurrent[i] = qcoeff[i]; |
291 |
pCurrent[i + 7] = qcoeff[i * 8]; |
pCurrent[i + 7] = qcoeff[i * 8]; |
342 |
|
|
343 |
/* store current coeffs to pred_values[] for future prediction */ |
/* store current coeffs to pred_values[] for future prediction */ |
344 |
pCurrent[0] = qcoeff[0] * iDcScaler; |
pCurrent[0] = qcoeff[0] * iDcScaler; |
345 |
|
pCurrent[0] = CLIP(pCurrent[0], -2048, 2047); |
346 |
for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
347 |
pCurrent[i] = qcoeff[i]; |
pCurrent[i] = qcoeff[i]; |
348 |
pCurrent[i + 7] = qcoeff[i * 8]; |
pCurrent[i + 7] = qcoeff[i * 8]; |
426 |
iDcScaler = get_dc_scaler(iQuant, j<4); |
iDcScaler = get_dc_scaler(iQuant, j<4); |
427 |
|
|
428 |
predict_acdc(frame->mbs, x, y, mb_width, j, &qcoeff[j * 64], |
predict_acdc(frame->mbs, x, y, mb_width, j, &qcoeff[j * 64], |
429 |
iQuant, iDcScaler, predictors[j], 0, 0); |
iQuant, iDcScaler, predictors[j], 0); |
430 |
|
|
431 |
if ((frame->vop_flags & XVID_VOP_HQACPRED)) |
if ((frame->vop_flags & XVID_VOP_HQACPRED)) |
432 |
S += calc_acdc_bits(pMB, j, &qcoeff[j * 64], iDcScaler, predictors[j]); |
S += calc_acdc_bits(pMB, j, &qcoeff[j * 64], iDcScaler, predictors[j]); |