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1 : | edgomez | 1.8 | /***************************************************************************** |
2 : | * | ||
3 : | * XVID MPEG-4 VIDEO CODEC | ||
4 : | * - Prediction functions - | ||
5 : | * | ||
6 : | * Copyright(C) 2001-2002 - Michael Militzer <isibaar@xvid.org> | ||
7 : | * Copyright(C) 2001-2002 - Peter Ross <pross@cs.rmit.edu.au> | ||
8 : | * | ||
9 : | * This program is an implementation of a part of one or more MPEG-4 | ||
10 : | * Video tools as specified in ISO/IEC 14496-2 standard. Those intending | ||
11 : | * to use this software module in hardware or software products are | ||
12 : | * advised that its use may infringe existing patents or copyrights, and | ||
13 : | * any such use would be at such party's own risk. The original | ||
14 : | * developer of this software module and his/her company, and subsequent | ||
15 : | * editors and their companies, will have no liability for use of this | ||
16 : | * software or modifications or derivatives thereof. | ||
17 : | * | ||
18 : | * This program is free software; you can redistribute it and/or modify | ||
19 : | * it under the terms of the GNU General Public License as published by | ||
20 : | * the Free Software Foundation; either version 2 of the License, or | ||
21 : | * (at your option) any later version. | ||
22 : | * | ||
23 : | * This program is distributed in the hope that it will be useful, | ||
24 : | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
25 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
26 : | * GNU General Public License for more details. | ||
27 : | * | ||
28 : | * You should have received a copy of the GNU General Public License | ||
29 : | * along with this program; if not, write to the Free Software | ||
30 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
31 : | * | ||
32 : | * $Id$ | ||
33 : | * | ||
34 : | ****************************************************************************/ | ||
35 : | Isibaar | 1.1 | |
36 : | #include "../encoder.h" | ||
37 : | #include "mbprediction.h" | ||
38 : | #include "../utils/mbfunctions.h" | ||
39 : | #include "../bitstream/cbp.h" | ||
40 : | |||
41 : | |||
42 : | #define ABS(X) (((X)>0)?(X):-(X)) | ||
43 : | #define DIV_DIV(A,B) ( (A) > 0 ? ((A)+((B)>>1))/(B) : ((A)-((B)>>1))/(B) ) | ||
44 : | |||
45 : | |||
46 : | edgomez | 1.8 | /***************************************************************************** |
47 : | * Local inlined function | ||
48 : | ****************************************************************************/ | ||
49 : | |||
50 : | edgomez | 1.4 | static int __inline |
51 : | rescale(int predict_quant, | ||
52 : | int current_quant, | ||
53 : | int coeff) | ||
54 : | Isibaar | 1.1 | { |
55 : | edgomez | 1.4 | return (coeff != 0) ? DIV_DIV((coeff) * (predict_quant), |
56 : | (current_quant)) : 0; | ||
57 : | Isibaar | 1.1 | } |
58 : | |||
59 : | |||
60 : | edgomez | 1.8 | /***************************************************************************** |
61 : | * Local data | ||
62 : | ****************************************************************************/ | ||
63 : | |||
64 : | edgomez | 1.4 | static const int16_t default_acdc_values[15] = { |
65 : | Isibaar | 1.1 | 1024, |
66 : | edgomez | 1.2 | 0, 0, 0, 0, 0, 0, 0, |
67 : | 0, 0, 0, 0, 0, 0, 0 | ||
68 : | Isibaar | 1.1 | }; |
69 : | edgomez | 1.8 | |
70 : | |||
71 : | /***************************************************************************** | ||
72 : | * Functions | ||
73 : | ****************************************************************************/ | ||
74 : | Isibaar | 1.1 | |
75 : | |||
76 : | /* get dc/ac prediction direction for a single block and place | ||
77 : | predictor values into MB->pred_values[j][..] | ||
78 : | */ | ||
79 : | |||
80 : | |||
81 : | edgomez | 1.4 | void |
82 : | predict_acdc(MACROBLOCK * pMBs, | ||
83 : | uint32_t x, | ||
84 : | uint32_t y, | ||
85 : | uint32_t mb_width, | ||
86 : | uint32_t block, | ||
87 : | int16_t qcoeff[64], | ||
88 : | uint32_t current_quant, | ||
89 : | int32_t iDcScaler, | ||
90 : | suxen_drol | 1.5 | int16_t predictors[8], |
91 : | suxen_drol | 1.6 | const int bound) |
92 : | suxen_drol | 1.5 | |
93 : | Isibaar | 1.1 | { |
94 : | suxen_drol | 1.6 | const int mbpos = (y * mb_width) + x; |
95 : | edgomez | 1.2 | int16_t *left, *top, *diag, *current; |
96 : | Isibaar | 1.1 | |
97 : | edgomez | 1.2 | int32_t left_quant = current_quant; |
98 : | int32_t top_quant = current_quant; | ||
99 : | Isibaar | 1.1 | |
100 : | edgomez | 1.2 | const int16_t *pLeft = default_acdc_values; |
101 : | const int16_t *pTop = default_acdc_values; | ||
102 : | const int16_t *pDiag = default_acdc_values; | ||
103 : | Isibaar | 1.1 | |
104 : | edgomez | 1.4 | uint32_t index = x + y * mb_width; // current macroblock |
105 : | int *acpred_direction = &pMBs[index].acpred_directions[block]; | ||
106 : | Isibaar | 1.1 | uint32_t i; |
107 : | |||
108 : | left = top = diag = current = 0; | ||
109 : | |||
110 : | // grab left,top and diag macroblocks | ||
111 : | |||
112 : | // left macroblock | ||
113 : | |||
114 : | suxen_drol | 1.5 | if (x && mbpos >= bound + 1 && |
115 : | edgomez | 1.4 | (pMBs[index - 1].mode == MODE_INTRA || |
116 : | pMBs[index - 1].mode == MODE_INTRA_Q)) { | ||
117 : | Isibaar | 1.1 | |
118 : | left = pMBs[index - 1].pred_values[0]; | ||
119 : | left_quant = pMBs[index - 1].quant; | ||
120 : | //DEBUGI("LEFT", *(left+MBPRED_SIZE)); | ||
121 : | } | ||
122 : | // top macroblock | ||
123 : | edgomez | 1.4 | |
124 : | suxen_drol | 1.6 | if (mbpos >= bound + (int)mb_width && |
125 : | edgomez | 1.4 | (pMBs[index - mb_width].mode == MODE_INTRA || |
126 : | pMBs[index - mb_width].mode == MODE_INTRA_Q)) { | ||
127 : | Isibaar | 1.1 | |
128 : | top = pMBs[index - mb_width].pred_values[0]; | ||
129 : | top_quant = pMBs[index - mb_width].quant; | ||
130 : | edgomez | 1.2 | } |
131 : | Isibaar | 1.1 | // diag macroblock |
132 : | edgomez | 1.4 | |
133 : | suxen_drol | 1.6 | if (x && mbpos >= bound + (int)mb_width + 1 && |
134 : | edgomez | 1.4 | (pMBs[index - 1 - mb_width].mode == MODE_INTRA || |
135 : | pMBs[index - 1 - mb_width].mode == MODE_INTRA_Q)) { | ||
136 : | Isibaar | 1.1 | |
137 : | diag = pMBs[index - 1 - mb_width].pred_values[0]; | ||
138 : | } | ||
139 : | |||
140 : | edgomez | 1.2 | current = pMBs[index].pred_values[0]; |
141 : | Isibaar | 1.1 | |
142 : | // now grab pLeft, pTop, pDiag _blocks_ | ||
143 : | edgomez | 1.4 | |
144 : | Isibaar | 1.1 | switch (block) { |
145 : | edgomez | 1.4 | |
146 : | case 0: | ||
147 : | if (left) | ||
148 : | Isibaar | 1.1 | pLeft = left + MBPRED_SIZE; |
149 : | edgomez | 1.4 | |
150 : | if (top) | ||
151 : | Isibaar | 1.1 | pTop = top + (MBPRED_SIZE << 1); |
152 : | edgomez | 1.4 | |
153 : | if (diag) | ||
154 : | Isibaar | 1.1 | pDiag = diag + 3 * MBPRED_SIZE; |
155 : | edgomez | 1.4 | |
156 : | Isibaar | 1.1 | break; |
157 : | edgomez | 1.4 | |
158 : | Isibaar | 1.1 | case 1: |
159 : | pLeft = current; | ||
160 : | left_quant = current_quant; | ||
161 : | edgomez | 1.4 | |
162 : | if (top) { | ||
163 : | Isibaar | 1.1 | pTop = top + 3 * MBPRED_SIZE; |
164 : | pDiag = top + (MBPRED_SIZE << 1); | ||
165 : | } | ||
166 : | break; | ||
167 : | edgomez | 1.4 | |
168 : | Isibaar | 1.1 | case 2: |
169 : | edgomez | 1.4 | if (left) { |
170 : | Isibaar | 1.1 | pLeft = left + 3 * MBPRED_SIZE; |
171 : | pDiag = left + MBPRED_SIZE; | ||
172 : | } | ||
173 : | edgomez | 1.4 | |
174 : | Isibaar | 1.1 | pTop = current; |
175 : | top_quant = current_quant; | ||
176 : | |||
177 : | break; | ||
178 : | edgomez | 1.4 | |
179 : | Isibaar | 1.1 | case 3: |
180 : | pLeft = current + (MBPRED_SIZE << 1); | ||
181 : | left_quant = current_quant; | ||
182 : | edgomez | 1.4 | |
183 : | Isibaar | 1.1 | pTop = current + MBPRED_SIZE; |
184 : | top_quant = current_quant; | ||
185 : | edgomez | 1.4 | |
186 : | Isibaar | 1.1 | pDiag = current; |
187 : | edgomez | 1.4 | |
188 : | Isibaar | 1.1 | break; |
189 : | edgomez | 1.4 | |
190 : | Isibaar | 1.1 | case 4: |
191 : | edgomez | 1.4 | if (left) |
192 : | Isibaar | 1.1 | pLeft = left + (MBPRED_SIZE << 2); |
193 : | edgomez | 1.4 | if (top) |
194 : | Isibaar | 1.1 | pTop = top + (MBPRED_SIZE << 2); |
195 : | edgomez | 1.4 | if (diag) |
196 : | Isibaar | 1.1 | pDiag = diag + (MBPRED_SIZE << 2); |
197 : | break; | ||
198 : | edgomez | 1.4 | |
199 : | Isibaar | 1.1 | case 5: |
200 : | edgomez | 1.4 | if (left) |
201 : | Isibaar | 1.1 | pLeft = left + 5 * MBPRED_SIZE; |
202 : | edgomez | 1.4 | if (top) |
203 : | Isibaar | 1.1 | pTop = top + 5 * MBPRED_SIZE; |
204 : | edgomez | 1.4 | if (diag) |
205 : | Isibaar | 1.1 | pDiag = diag + 5 * MBPRED_SIZE; |
206 : | break; | ||
207 : | } | ||
208 : | |||
209 : | edgomez | 1.4 | // determine ac prediction direction & ac/dc predictor |
210 : | // place rescaled ac/dc predictions into predictors[] for later use | ||
211 : | Isibaar | 1.1 | |
212 : | edgomez | 1.4 | if (ABS(pLeft[0] - pDiag[0]) < ABS(pDiag[0] - pTop[0])) { |
213 : | *acpred_direction = 1; // vertical | ||
214 : | Isibaar | 1.1 | predictors[0] = DIV_DIV(pTop[0], iDcScaler); |
215 : | edgomez | 1.4 | for (i = 1; i < 8; i++) { |
216 : | Isibaar | 1.1 | predictors[i] = rescale(top_quant, current_quant, pTop[i]); |
217 : | } | ||
218 : | edgomez | 1.4 | } else { |
219 : | *acpred_direction = 2; // horizontal | ||
220 : | Isibaar | 1.1 | predictors[0] = DIV_DIV(pLeft[0], iDcScaler); |
221 : | edgomez | 1.4 | for (i = 1; i < 8; i++) { |
222 : | Isibaar | 1.1 | predictors[i] = rescale(left_quant, current_quant, pLeft[i + 7]); |
223 : | } | ||
224 : | } | ||
225 : | } | ||
226 : | |||
227 : | |||
228 : | /* decoder: add predictors to dct_codes[] and | ||
229 : | store current coeffs to pred_values[] for future prediction | ||
230 : | */ | ||
231 : | |||
232 : | |||
233 : | edgomez | 1.4 | void |
234 : | add_acdc(MACROBLOCK * pMB, | ||
235 : | uint32_t block, | ||
236 : | int16_t dct_codes[64], | ||
237 : | uint32_t iDcScaler, | ||
238 : | int16_t predictors[8]) | ||
239 : | Isibaar | 1.1 | { |
240 : | uint8_t acpred_direction = pMB->acpred_directions[block]; | ||
241 : | edgomez | 1.4 | int16_t *pCurrent = pMB->pred_values[block]; |
242 : | Isibaar | 1.1 | uint32_t i; |
243 : | |||
244 : | suxen_drol | 1.6 | DPRINTF(DPRINTF_COEFF,"predictor[0] %i", predictors[0]); |
245 : | |||
246 : | Isibaar | 1.1 | dct_codes[0] += predictors[0]; // dc prediction |
247 : | pCurrent[0] = dct_codes[0] * iDcScaler; | ||
248 : | |||
249 : | edgomez | 1.4 | if (acpred_direction == 1) { |
250 : | for (i = 1; i < 8; i++) { | ||
251 : | Isibaar | 1.1 | int level = dct_codes[i] + predictors[i]; |
252 : | edgomez | 1.4 | |
253 : | suxen_drol | 1.6 | DPRINTF(DPRINTF_COEFF,"predictor[%i] %i",i, predictors[i]); |
254 : | |||
255 : | Isibaar | 1.1 | dct_codes[i] = level; |
256 : | pCurrent[i] = level; | ||
257 : | edgomez | 1.4 | pCurrent[i + 7] = dct_codes[i * 8]; |
258 : | Isibaar | 1.1 | } |
259 : | edgomez | 1.4 | } else if (acpred_direction == 2) { |
260 : | for (i = 1; i < 8; i++) { | ||
261 : | int level = dct_codes[i * 8] + predictors[i]; | ||
262 : | suxen_drol | 1.6 | DPRINTF(DPRINTF_COEFF,"predictor[%i] %i",i*8, predictors[i]); |
263 : | edgomez | 1.4 | |
264 : | dct_codes[i * 8] = level; | ||
265 : | pCurrent[i + 7] = level; | ||
266 : | Isibaar | 1.1 | pCurrent[i] = dct_codes[i]; |
267 : | } | ||
268 : | edgomez | 1.4 | } else { |
269 : | for (i = 1; i < 8; i++) { | ||
270 : | Isibaar | 1.1 | pCurrent[i] = dct_codes[i]; |
271 : | edgomez | 1.4 | pCurrent[i + 7] = dct_codes[i * 8]; |
272 : | Isibaar | 1.1 | } |
273 : | } | ||
274 : | } | ||
275 : | |||
276 : | |||
277 : | |||
278 : | // ****************************************************************** | ||
279 : | // ****************************************************************** | ||
280 : | |||
281 : | /* encoder: subtract predictors from qcoeff[] and calculate S1/S2 | ||
282 : | |||
283 : | edgomez | 1.2 | todo: perform [-127,127] clamping after prediction |
284 : | clamping must adjust the coeffs, so dequant is done correctly | ||
285 : | Isibaar | 1.1 | |
286 : | edgomez | 1.2 | S1/S2 are used to determine if its worth predicting for AC |
287 : | S1 = sum of all (qcoeff - prediction) | ||
288 : | S2 = sum of all qcoeff | ||
289 : | */ | ||
290 : | Isibaar | 1.1 | |
291 : | edgomez | 1.4 | uint32_t |
292 : | calc_acdc(MACROBLOCK * pMB, | ||
293 : | uint32_t block, | ||
294 : | int16_t qcoeff[64], | ||
295 : | uint32_t iDcScaler, | ||
296 : | int16_t predictors[8]) | ||
297 : | Isibaar | 1.1 | { |
298 : | edgomez | 1.4 | int16_t *pCurrent = pMB->pred_values[block]; |
299 : | Isibaar | 1.1 | uint32_t i; |
300 : | uint32_t S1 = 0, S2 = 0; | ||
301 : | |||
302 : | |||
303 : | /* store current coeffs to pred_values[] for future prediction */ | ||
304 : | |||
305 : | pCurrent[0] = qcoeff[0] * iDcScaler; | ||
306 : | edgomez | 1.4 | for (i = 1; i < 8; i++) { |
307 : | Isibaar | 1.1 | pCurrent[i] = qcoeff[i]; |
308 : | pCurrent[i + 7] = qcoeff[i * 8]; | ||
309 : | edgomez | 1.2 | } |
310 : | Isibaar | 1.1 | |
311 : | /* subtract predictors and store back in predictors[] */ | ||
312 : | |||
313 : | qcoeff[0] = qcoeff[0] - predictors[0]; | ||
314 : | |||
315 : | edgomez | 1.4 | if (pMB->acpred_directions[block] == 1) { |
316 : | for (i = 1; i < 8; i++) { | ||
317 : | Isibaar | 1.1 | int16_t level; |
318 : | |||
319 : | level = qcoeff[i]; | ||
320 : | S2 += ABS(level); | ||
321 : | level -= predictors[i]; | ||
322 : | S1 += ABS(level); | ||
323 : | predictors[i] = level; | ||
324 : | } | ||
325 : | edgomez | 1.4 | } else // acpred_direction == 2 |
326 : | Isibaar | 1.1 | { |
327 : | edgomez | 1.4 | for (i = 1; i < 8; i++) { |
328 : | Isibaar | 1.1 | int16_t level; |
329 : | |||
330 : | edgomez | 1.4 | level = qcoeff[i * 8]; |
331 : | Isibaar | 1.1 | S2 += ABS(level); |
332 : | level -= predictors[i]; | ||
333 : | S1 += ABS(level); | ||
334 : | predictors[i] = level; | ||
335 : | } | ||
336 : | |||
337 : | edgomez | 1.2 | } |
338 : | Isibaar | 1.1 | |
339 : | edgomez | 1.4 | |
340 : | edgomez | 1.2 | return S2 - S1; |
341 : | Isibaar | 1.1 | } |
342 : | |||
343 : | |||
344 : | /* apply predictors[] to qcoeff */ | ||
345 : | |||
346 : | edgomez | 1.4 | void |
347 : | apply_acdc(MACROBLOCK * pMB, | ||
348 : | uint32_t block, | ||
349 : | int16_t qcoeff[64], | ||
350 : | int16_t predictors[8]) | ||
351 : | Isibaar | 1.1 | { |
352 : | uint32_t i; | ||
353 : | |||
354 : | edgomez | 1.4 | if (pMB->acpred_directions[block] == 1) { |
355 : | for (i = 1; i < 8; i++) { | ||
356 : | Isibaar | 1.1 | qcoeff[i] = predictors[i]; |
357 : | } | ||
358 : | edgomez | 1.4 | } else { |
359 : | for (i = 1; i < 8; i++) { | ||
360 : | qcoeff[i * 8] = predictors[i]; | ||
361 : | Isibaar | 1.1 | } |
362 : | edgomez | 1.2 | } |
363 : | Isibaar | 1.1 | } |
364 : | |||
365 : | |||
366 : | edgomez | 1.4 | void |
367 : | MBPrediction(FRAMEINFO * frame, | ||
368 : | uint32_t x, | ||
369 : | uint32_t y, | ||
370 : | uint32_t mb_width, | ||
371 : | int16_t qcoeff[6 * 64]) | ||
372 : | Isibaar | 1.1 | { |
373 : | edgomez | 1.2 | |
374 : | int32_t j; | ||
375 : | suxen_drol | 1.3 | int32_t iDcScaler, iQuant = frame->quant; |
376 : | Isibaar | 1.1 | int32_t S = 0; |
377 : | int16_t predictors[6][8]; | ||
378 : | |||
379 : | suxen_drol | 1.3 | MACROBLOCK *pMB = &frame->mbs[x + y * mb_width]; |
380 : | Isibaar | 1.1 | |
381 : | edgomez | 1.2 | if ((pMB->mode == MODE_INTRA) || (pMB->mode == MODE_INTRA_Q)) { |
382 : | edgomez | 1.4 | |
383 : | for (j = 0; j < 6; j++) { | ||
384 : | Isibaar | 1.1 | iDcScaler = get_dc_scaler(iQuant, (j < 4) ? 1 : 0); |
385 : | |||
386 : | edgomez | 1.4 | predict_acdc(frame->mbs, x, y, mb_width, j, &qcoeff[j * 64], |
387 : | suxen_drol | 1.6 | iQuant, iDcScaler, predictors[j], 0); |
388 : | edgomez | 1.4 | |
389 : | S += calc_acdc(pMB, j, &qcoeff[j * 64], iDcScaler, predictors[j]); | ||
390 : | edgomez | 1.2 | |
391 : | Isibaar | 1.1 | } |
392 : | |||
393 : | edgomez | 1.4 | if (S < 0) // dont predict |
394 : | { | ||
395 : | for (j = 0; j < 6; j++) { | ||
396 : | Isibaar | 1.1 | pMB->acpred_directions[j] = 0; |
397 : | } | ||
398 : | edgomez | 1.4 | } else { |
399 : | for (j = 0; j < 6; j++) { | ||
400 : | apply_acdc(pMB, j, &qcoeff[j * 64], predictors[j]); | ||
401 : | Isibaar | 1.1 | } |
402 : | } | ||
403 : | pMB->cbp = calc_cbp(qcoeff); | ||
404 : | } | ||
405 : | edgomez | 1.2 | |
406 : | suxen_drol | 1.6 | } |
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