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1 : edgomez 866 /*****************************************************************************
2 : Isibaar 3 *
3 : edgomez 146 * XVID MPEG-4 VIDEO CODEC
4 : edgomez 866 * - Decoder Module -
5 : Isibaar 3 *
6 : edgomez 1382 * Copyright(C) 2002 MinChen <chenm001@163.com>
7 : Isibaar 1911 * 2002-2010 Peter Ross <pross@xvid.org>
8 : edgomez 605 *
9 : edgomez 1382 * This program is free software ; you can redistribute it and/or modify
10 : edgomez 851 * it under the terms of the GNU General Public License as published by
11 : edgomez 1382 * the Free Software Foundation ; either version 2 of the License, or
12 : edgomez 146 * (at your option) any later version.
13 : Isibaar 3 *
14 : edgomez 146 * This program is distributed in the hope that it will be useful,
15 : edgomez 1382 * but WITHOUT ANY WARRANTY ; without even the implied warranty of
16 : edgomez 146 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 :     * GNU General Public License for more details.
18 : Isibaar 3 *
19 : edgomez 146 * You should have received a copy of the GNU General Public License
20 : edgomez 1382 * along with this program ; if not, write to the Free Software
21 : edgomez 146 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 : Isibaar 3 *
23 : Isibaar 1988 * $Id$
24 : Isibaar 3 *
25 : edgomez 866 ****************************************************************************/
26 : Isibaar 3
27 : edgomez 851 #include <stdio.h>
28 : Isibaar 3 #include <stdlib.h>
29 : edgomez 146 #include <string.h>
30 : Isibaar 3
31 : chenm001 290 #ifdef BFRAMES_DEC_DEBUG
32 : suxen_drol 1632 #define BFRAMES_DEC
33 : chenm001 290 #endif
34 :    
35 : Isibaar 3 #include "xvid.h"
36 :     #include "portab.h"
37 : edgomez 851 #include "global.h"
38 : Isibaar 3
39 :     #include "decoder.h"
40 :     #include "bitstream/bitstream.h"
41 :     #include "bitstream/mbcoding.h"
42 :    
43 : edgomez 1382 #include "quant/quant.h"
44 :     #include "quant/quant_matrix.h"
45 : Isibaar 3 #include "dct/idct.h"
46 :     #include "dct/fdct.h"
47 :     #include "utils/mem_transfer.h"
48 :     #include "image/interpolate8x8.h"
49 : edgomez 851 #include "image/font.h"
50 : edgomez 1492 #include "image/qpel.h"
51 : Isibaar 3
52 :     #include "bitstream/mbcoding.h"
53 :     #include "prediction/mbprediction.h"
54 :     #include "utils/timer.h"
55 :     #include "utils/emms.h"
56 : edgomez 851 #include "motion/motion.h"
57 : edgomez 1382 #include "motion/gmc.h"
58 : Isibaar 3
59 :     #include "image/image.h"
60 :     #include "image/colorspace.h"
61 : edgomez 1382 #include "image/postprocessing.h"
62 : Isibaar 41 #include "utils/mem_align.h"
63 : Isibaar 3
64 : suxen_drol 1632 #define DIV2ROUND(n) (((n)>>1)|((n)&1))
65 :     #define DIV2(n) ((n)>>1)
66 :     #define DIVUVMOV(n) (((n) >> 1) + roundtab_79[(n) & 0x3]) //
67 :    
68 : edgomez 1382 static int
69 : edgomez 851 decoder_resize(DECODER * dec)
70 : Isibaar 3 {
71 : edgomez 851 /* free existing */
72 :     image_destroy(&dec->cur, dec->edged_width, dec->edged_height);
73 :     image_destroy(&dec->refn[0], dec->edged_width, dec->edged_height);
74 :     image_destroy(&dec->refn[1], dec->edged_width, dec->edged_height);
75 :     image_destroy(&dec->tmp, dec->edged_width, dec->edged_height);
76 :     image_destroy(&dec->qtmp, dec->edged_width, dec->edged_height);
77 : Isibaar 3
78 : edgomez 851 image_destroy(&dec->gmc, dec->edged_width, dec->edged_height);
79 : Isibaar 3
80 : Skal 1616 image_null(&dec->cur);
81 :     image_null(&dec->refn[0]);
82 :     image_null(&dec->refn[1]);
83 :     image_null(&dec->tmp);
84 :     image_null(&dec->qtmp);
85 :     image_null(&dec->gmc);
86 : edgomez 851
87 : Skal 1616
88 :     xvid_free(dec->last_mbs);
89 :     xvid_free(dec->mbs);
90 :     xvid_free(dec->qscale);
91 :     dec->last_mbs = NULL;
92 :     dec->mbs = NULL;
93 :     dec->qscale = NULL;
94 :    
95 : edgomez 851 /* realloc */
96 : Isibaar 3 dec->mb_width = (dec->width + 15) / 16;
97 :     dec->mb_height = (dec->height + 15) / 16;
98 :    
99 :     dec->edged_width = 16 * dec->mb_width + 2 * EDGE_SIZE;
100 :     dec->edged_height = 16 * dec->mb_height + 2 * EDGE_SIZE;
101 : edgomez 195
102 : Skal 1616 if ( image_create(&dec->cur, dec->edged_width, dec->edged_height)
103 :     || image_create(&dec->refn[0], dec->edged_width, dec->edged_height)
104 :     || image_create(&dec->refn[1], dec->edged_width, dec->edged_height) /* Support B-frame to reference last 2 frame */
105 :     || image_create(&dec->tmp, dec->edged_width, dec->edged_height)
106 :     || image_create(&dec->qtmp, dec->edged_width, dec->edged_height)
107 :     || image_create(&dec->gmc, dec->edged_width, dec->edged_height) )
108 :     goto memory_error;
109 : Isibaar 3
110 : edgomez 195 dec->mbs =
111 :     xvid_malloc(sizeof(MACROBLOCK) * dec->mb_width * dec->mb_height,
112 :     CACHE_LINE);
113 : Skal 1616 if (dec->mbs == NULL)
114 :     goto memory_error;
115 : Isibaar 208 memset(dec->mbs, 0, sizeof(MACROBLOCK) * dec->mb_width * dec->mb_height);
116 :    
117 : edgomez 866 /* For skip MB flag */
118 : edgomez 195 dec->last_mbs =
119 :     xvid_malloc(sizeof(MACROBLOCK) * dec->mb_width * dec->mb_height,
120 :     CACHE_LINE);
121 : Skal 1616 if (dec->last_mbs == NULL)
122 :     goto memory_error;
123 : Isibaar 208 memset(dec->last_mbs, 0, sizeof(MACROBLOCK) * dec->mb_width * dec->mb_height);
124 :    
125 : edgomez 1382 /* nothing happens if that fails */
126 :     dec->qscale =
127 :     xvid_malloc(sizeof(int) * dec->mb_width * dec->mb_height, CACHE_LINE);
128 :    
129 :     if (dec->qscale)
130 :     memset(dec->qscale, 0, sizeof(int) * dec->mb_width * dec->mb_height);
131 :    
132 :     return 0;
133 : Skal 1616
134 :     memory_error:
135 :     /* Most structures were deallocated / nullifieded, so it should be safe */
136 :     /* decoder_destroy(dec) minus the write_timer */
137 :     xvid_free(dec->mbs);
138 :     image_destroy(&dec->cur, dec->edged_width, dec->edged_height);
139 :     image_destroy(&dec->refn[0], dec->edged_width, dec->edged_height);
140 :     image_destroy(&dec->refn[1], dec->edged_width, dec->edged_height);
141 :     image_destroy(&dec->tmp, dec->edged_width, dec->edged_height);
142 :     image_destroy(&dec->qtmp, dec->edged_width, dec->edged_height);
143 :    
144 :     xvid_free(dec);
145 :     return XVID_ERR_MEMORY;
146 : edgomez 851 }
147 :    
148 :    
149 :     int
150 : edgomez 1382 decoder_create(xvid_dec_create_t * create)
151 : edgomez 851 {
152 : Isibaar 2177 int ret = 0;
153 : suxen_drol 1632 DECODER *dec;
154 : edgomez 851
155 : suxen_drol 1632 if (XVID_VERSION_MAJOR(create->version) != 1) /* v1.x.x */
156 :     return XVID_ERR_VERSION;
157 : edgomez 1382
158 : suxen_drol 1632 dec = xvid_malloc(sizeof(DECODER), CACHE_LINE);
159 :     if (dec == NULL) {
160 :     return XVID_ERR_MEMORY;
161 :     }
162 : edgomez 1382
163 : suxen_drol 1632 memset(dec, 0, sizeof(DECODER));
164 : edgomez 851
165 : suxen_drol 1632 dec->mpeg_quant_matrices = xvid_malloc(sizeof(uint16_t) * 64 * 8, CACHE_LINE);
166 :     if (dec->mpeg_quant_matrices == NULL) {
167 :     xvid_free(dec);
168 :     return XVID_ERR_MEMORY;
169 :     }
170 : edgomez 851
171 : suxen_drol 1632 create->handle = dec;
172 : edgomez 851
173 : Isibaar 2177 dec->width = MAX(0, create->width);
174 :     dec->height = MAX(0, create->height);
175 : edgomez 1382
176 : Isibaar 1911 dec->num_threads = MAX(0, create->num_threads);
177 :    
178 : suxen_drol 1632 image_null(&dec->cur);
179 :     image_null(&dec->refn[0]);
180 :     image_null(&dec->refn[1]);
181 :     image_null(&dec->tmp);
182 :     image_null(&dec->qtmp);
183 : edgomez 851
184 : suxen_drol 1632 /* image based GMC */
185 :     image_null(&dec->gmc);
186 : edgomez 851
187 : suxen_drol 1632 dec->mbs = NULL;
188 :     dec->last_mbs = NULL;
189 :     dec->qscale = NULL;
190 : edgomez 851
191 : suxen_drol 1632 init_timer();
192 :     init_postproc(&dec->postproc);
193 :     init_mpeg_matrix(dec->mpeg_quant_matrices);
194 : Isibaar 3
195 : suxen_drol 1632 /* For B-frame support (used to save reference frame's time */
196 :     dec->frames = 0;
197 :     dec->time = dec->time_base = dec->last_time_base = 0;
198 :     dec->low_delay = 0;
199 :     dec->packed_mode = 0;
200 :     dec->time_inc_resolution = 1; /* until VOL header says otherwise */
201 : Skal 1696 dec->ver_id = 1;
202 : edgomez 195
203 : Isibaar 1890 if (create->fourcc == ((int)('X')|((int)('V')<<8)|
204 :     ((int)('I')<<16)|((int)('D')<<24))) { /* XVID */
205 : Isibaar 1891 dec->bs_version = 0; /* Initially assume oldest xvid version */
206 : Isibaar 1890 }
207 :     else {
208 :     dec->bs_version = 0xffff; /* Initialize to very high value -> assume bugfree stream */
209 :     }
210 : Isibaar 1671
211 : suxen_drol 1632 dec->fixed_dimensions = (dec->width > 0 && dec->height > 0);
212 : edgomez 851
213 : Isibaar 2177 ret = decoder_resize(dec);
214 :     if (ret == XVID_ERR_MEMORY) create->handle = NULL;
215 :    
216 :     return ret;
217 : Isibaar 3 }
218 :    
219 :    
220 : edgomez 195 int
221 :     decoder_destroy(DECODER * dec)
222 : Isibaar 3 {
223 : suxen_drol 1632 xvid_free(dec->last_mbs);
224 :     xvid_free(dec->mbs);
225 :     xvid_free(dec->qscale);
226 : edgomez 851
227 : suxen_drol 1632 /* image based GMC */
228 :     image_destroy(&dec->gmc, dec->edged_width, dec->edged_height);
229 : edgomez 851
230 : suxen_drol 1632 image_destroy(&dec->refn[0], dec->edged_width, dec->edged_height);
231 :     image_destroy(&dec->refn[1], dec->edged_width, dec->edged_height);
232 :     image_destroy(&dec->tmp, dec->edged_width, dec->edged_height);
233 :     image_destroy(&dec->qtmp, dec->edged_width, dec->edged_height);
234 :     image_destroy(&dec->cur, dec->edged_width, dec->edged_height);
235 :     xvid_free(dec->mpeg_quant_matrices);
236 :     xvid_free(dec);
237 : Isibaar 3
238 : suxen_drol 1632 write_timer();
239 :     return 0;
240 : Isibaar 3 }
241 :    
242 : edgomez 195 static const int32_t dquant_table[4] = {
243 : suxen_drol 1632 -1, -2, 1, 2
244 : Isibaar 3 };
245 :    
246 : edgomez 866 /* decode an intra macroblock */
247 : edgomez 1382 static void
248 : edgomez 195 decoder_mbintra(DECODER * dec,
249 : suxen_drol 1632 MACROBLOCK * pMB,
250 :     const uint32_t x_pos,
251 :     const uint32_t y_pos,
252 :     const uint32_t acpred_flag,
253 :     const uint32_t cbp,
254 :     Bitstream * bs,
255 :     const uint32_t quant,
256 :     const uint32_t intra_dc_threshold,
257 :     const unsigned int bound)
258 : Isibaar 3 {
259 : edgomez 78
260 : suxen_drol 1632 DECLARE_ALIGNED_MATRIX(block, 6, 64, int16_t, CACHE_LINE);
261 :     DECLARE_ALIGNED_MATRIX(data, 6, 64, int16_t, CACHE_LINE);
262 : edgomez 78
263 : suxen_drol 1632 uint32_t stride = dec->edged_width;
264 :     uint32_t stride2 = stride / 2;
265 :     uint32_t next_block = stride * 8;
266 :     uint32_t i;
267 : Isibaar 2177 uint32_t iQuant = MAX(1, pMB->quant);
268 : suxen_drol 1632 uint8_t *pY_Cur, *pU_Cur, *pV_Cur;
269 : h 69
270 : suxen_drol 1632 pY_Cur = dec->cur.y + (y_pos << 4) * stride + (x_pos << 4);
271 :     pU_Cur = dec->cur.u + (y_pos << 3) * stride2 + (x_pos << 3);
272 :     pV_Cur = dec->cur.v + (y_pos << 3) * stride2 + (x_pos << 3);
273 : h 69
274 : suxen_drol 1632 memset(block, 0, 6 * 64 * sizeof(int16_t)); /* clear */
275 : h 69
276 : suxen_drol 1632 for (i = 0; i < 6; i++) {
277 :     uint32_t iDcScaler = get_dc_scaler(iQuant, i < 4);
278 :     int16_t predictors[8];
279 :     int start_coeff;
280 : Isibaar 3
281 : suxen_drol 1632 start_timer();
282 :     predict_acdc(dec->mbs, x_pos, y_pos, dec->mb_width, i, &block[i * 64],
283 :     iQuant, iDcScaler, predictors, bound);
284 :     if (!acpred_flag) {
285 :     pMB->acpred_directions[i] = 0;
286 :     }
287 :     stop_prediction_timer();
288 : Isibaar 3
289 : suxen_drol 1632 if (quant < intra_dc_threshold) {
290 :     int dc_size;
291 :     int dc_dif;
292 : Isibaar 3
293 : suxen_drol 1632 dc_size = i < 4 ? get_dc_size_lum(bs) : get_dc_size_chrom(bs);
294 :     dc_dif = dc_size ? get_dc_dif(bs, dc_size) : 0;
295 : Isibaar 3
296 : suxen_drol 1632 if (dc_size > 8) {
297 :     BitstreamSkip(bs, 1); /* marker */
298 :     }
299 : edgomez 195
300 : suxen_drol 1632 block[i * 64 + 0] = dc_dif;
301 :     start_coeff = 1;
302 : chenm001 272
303 : suxen_drol 1632 DPRINTF(XVID_DEBUG_COEFF,"block[0] %i\n", dc_dif);
304 :     } else {
305 :     start_coeff = 0;
306 :     }
307 : Isibaar 3
308 : suxen_drol 1632 start_timer();
309 :     if (cbp & (1 << (5 - i))) /* coded */
310 :     {
311 :     int direction = dec->alternate_vertical_scan ?
312 :     2 : pMB->acpred_directions[i];
313 : edgomez 851
314 : suxen_drol 1632 get_intra_block(bs, &block[i * 64], direction, start_coeff);
315 :     }
316 :     stop_coding_timer();
317 : Isibaar 3
318 : suxen_drol 1632 start_timer();
319 :     add_acdc(pMB, i, &block[i * 64], iDcScaler, predictors, dec->bs_version);
320 :     stop_prediction_timer();
321 : Isibaar 3
322 : suxen_drol 1632 start_timer();
323 :     if (dec->quant_type == 0) {
324 :     dequant_h263_intra(&data[i * 64], &block[i * 64], iQuant, iDcScaler, dec->mpeg_quant_matrices);
325 :     } else {
326 :     dequant_mpeg_intra(&data[i * 64], &block[i * 64], iQuant, iDcScaler, dec->mpeg_quant_matrices);
327 :     }
328 :     stop_iquant_timer();
329 : Isibaar 3
330 : suxen_drol 1632 start_timer();
331 : suxen_drol 1653 idct((short * const)&data[i * 64]);
332 : suxen_drol 1632 stop_idct_timer();
333 : edgomez 851
334 : suxen_drol 1632 }
335 : Isibaar 3
336 : suxen_drol 1632 if (dec->interlacing && pMB->field_dct) {
337 :     next_block = stride;
338 :     stride *= 2;
339 :     }
340 : h 69
341 : suxen_drol 1632 start_timer();
342 :     transfer_16to8copy(pY_Cur, &data[0 * 64], stride);
343 :     transfer_16to8copy(pY_Cur + 8, &data[1 * 64], stride);
344 :     transfer_16to8copy(pY_Cur + next_block, &data[2 * 64], stride);
345 :     transfer_16to8copy(pY_Cur + 8 + next_block, &data[3 * 64], stride);
346 :     transfer_16to8copy(pU_Cur, &data[4 * 64], stride2);
347 :     transfer_16to8copy(pV_Cur, &data[5 * 64], stride2);
348 :     stop_transfer_timer();
349 : Isibaar 3 }
350 :    
351 : edgomez 1382 static void
352 :     decoder_mb_decode(DECODER * dec,
353 : suxen_drol 1632 const uint32_t cbp,
354 :     Bitstream * bs,
355 :     uint8_t * pY_Cur,
356 :     uint8_t * pU_Cur,
357 :     uint8_t * pV_Cur,
358 :     const MACROBLOCK * pMB)
359 : edgomez 1382 {
360 : suxen_drol 1632 DECLARE_ALIGNED_MATRIX(data, 1, 64, int16_t, CACHE_LINE);
361 : Isibaar 3
362 : suxen_drol 1632 int stride = dec->edged_width;
363 :     int i;
364 : Isibaar 2177 const uint32_t iQuant = MAX(1, pMB->quant);
365 : suxen_drol 1632 const int direction = dec->alternate_vertical_scan ? 2 : 0;
366 :     typedef void (*get_inter_block_function_t)(
367 :     Bitstream * bs,
368 :     int16_t * block,
369 :     int direction,
370 :     const int quant,
371 :     const uint16_t *matrix);
372 :     typedef void (*add_residual_function_t)(
373 :     uint8_t *predicted_block,
374 :     const int16_t *residual,
375 :     int stride);
376 : Isibaar 3
377 : suxen_drol 1632 const get_inter_block_function_t get_inter_block = (dec->quant_type == 0)
378 :     ? (get_inter_block_function_t)get_inter_block_h263
379 :     : (get_inter_block_function_t)get_inter_block_mpeg;
380 : edgomez 1524
381 : suxen_drol 1632 uint8_t *dst[6];
382 :     int strides[6];
383 : edgomez 1486
384 : edgomez 1524
385 : suxen_drol 1632 if (dec->interlacing && pMB->field_dct) {
386 :     dst[0] = pY_Cur;
387 :     dst[1] = pY_Cur + 8;
388 :     dst[2] = pY_Cur + stride;
389 :     dst[3] = dst[2] + 8;
390 :     dst[4] = pU_Cur;
391 :     dst[5] = pV_Cur;
392 :     strides[0] = strides[1] = strides[2] = strides[3] = stride*2;
393 :     strides[4] = stride/2;
394 :     strides[5] = stride/2;
395 :     } else {
396 :     dst[0] = pY_Cur;
397 :     dst[1] = pY_Cur + 8;
398 :     dst[2] = pY_Cur + 8*stride;
399 :     dst[3] = dst[2] + 8;
400 :     dst[4] = pU_Cur;
401 :     dst[5] = pV_Cur;
402 :     strides[0] = strides[1] = strides[2] = strides[3] = stride;
403 :     strides[4] = stride/2;
404 :     strides[5] = stride/2;
405 :     }
406 : Isibaar 3
407 : suxen_drol 1632 for (i = 0; i < 6; i++) {
408 :     /* Process only coded blocks */
409 :     if (cbp & (1 << (5 - i))) {
410 : edgomez 1382
411 : suxen_drol 1632 /* Clear the block */
412 :     memset(&data[0], 0, 64*sizeof(int16_t));
413 : edgomez 1382
414 : suxen_drol 1632 /* Decode coeffs and dequantize on the fly */
415 :     start_timer();
416 :     get_inter_block(bs, &data[0], direction, iQuant, get_inter_matrix(dec->mpeg_quant_matrices));
417 :     stop_coding_timer();
418 : edgomez 1524
419 : suxen_drol 1632 /* iDCT */
420 :     start_timer();
421 : suxen_drol 1653 idct((short * const)&data[0]);
422 : suxen_drol 1632 stop_idct_timer();
423 :    
424 :     /* Add this residual to the predicted block */
425 :     start_timer();
426 :     transfer_16to8add(dst[i], &data[0], strides[i]);
427 :     stop_transfer_timer();
428 :     }
429 :     }
430 : edgomez 1382 }
431 :    
432 : edgomez 1533 static void __inline
433 : syskin 1532 validate_vector(VECTOR * mv, unsigned int x_pos, unsigned int y_pos, const DECODER * dec)
434 :     {
435 : suxen_drol 1632 /* clip a vector to valid range
436 :     prevents crashes if bitstream is broken
437 :     */
438 :     int shift = 5 + dec->quarterpel;
439 :     int xborder_high = (int)(dec->mb_width - x_pos) << shift;
440 :     int xborder_low = (-(int)x_pos-1) << shift;
441 :     int yborder_high = (int)(dec->mb_height - y_pos) << shift;
442 :     int yborder_low = (-(int)y_pos-1) << shift;
443 : syskin 1532
444 : edgomez 1533 #define CHECK_MV(mv) \
445 : suxen_drol 1632 do { \
446 :     if ((mv).x > xborder_high) { \
447 :     DPRINTF(XVID_DEBUG_MV, "mv.x > max -- %d > %d, MB %d, %d", (mv).x, xborder_high, x_pos, y_pos); \
448 :     (mv).x = xborder_high; \
449 :     } else if ((mv).x < xborder_low) { \
450 :     DPRINTF(XVID_DEBUG_MV, "mv.x < min -- %d < %d, MB %d, %d", (mv).x, xborder_low, x_pos, y_pos); \
451 :     (mv).x = xborder_low; \
452 :     } \
453 :     if ((mv).y > yborder_high) { \
454 :     DPRINTF(XVID_DEBUG_MV, "mv.y > max -- %d > %d, MB %d, %d", (mv).y, yborder_high, x_pos, y_pos); \
455 :     (mv).y = yborder_high; \
456 :     } else if ((mv).y < yborder_low) { \
457 :     DPRINTF(XVID_DEBUG_MV, "mv.y < min -- %d < %d, MB %d, %d", (mv).y, yborder_low, x_pos, y_pos); \
458 :     (mv).y = yborder_low; \
459 :     } \
460 :     } while (0)
461 : syskin 1532
462 : suxen_drol 1632 CHECK_MV(mv[0]);
463 :     CHECK_MV(mv[1]);
464 :     CHECK_MV(mv[2]);
465 :     CHECK_MV(mv[3]);
466 : syskin 1532 }
467 :    
468 : Isibaar 1628 /* Up to this version, chroma rounding was wrong with qpel.
469 :     * So we try to be backward compatible to avoid artifacts */
470 :     #define BS_VERSION_BUGGY_CHROMA_ROUNDING 1
471 :    
472 : edgomez 866 /* decode an inter macroblock */
473 : edgomez 1382 static void
474 : edgomez 195 decoder_mbinter(DECODER * dec,
475 : suxen_drol 1632 const MACROBLOCK * pMB,
476 :     const uint32_t x_pos,
477 :     const uint32_t y_pos,
478 :     const uint32_t cbp,
479 :     Bitstream * bs,
480 :     const uint32_t rounding,
481 : Isibaar 1669 const int ref,
482 :     const int bvop)
483 : Isibaar 3 {
484 : suxen_drol 1632 uint32_t stride = dec->edged_width;
485 :     uint32_t stride2 = stride / 2;
486 :     uint32_t i;
487 : edgomez 1382
488 : suxen_drol 1632 uint8_t *pY_Cur, *pU_Cur, *pV_Cur;
489 : edgomez 851
490 : suxen_drol 1632 int uv_dx, uv_dy;
491 :     VECTOR mv[4]; /* local copy of mvs */
492 : Isibaar 3
493 : suxen_drol 1632 pY_Cur = dec->cur.y + (y_pos << 4) * stride + (x_pos << 4);
494 :     pU_Cur = dec->cur.u + (y_pos << 3) * stride2 + (x_pos << 3);
495 :     pV_Cur = dec->cur.v + (y_pos << 3) * stride2 + (x_pos << 3);
496 :     for (i = 0; i < 4; i++)
497 :     mv[i] = pMB->mvs[i];
498 : Isibaar 3
499 : suxen_drol 1632 validate_vector(mv, x_pos, y_pos, dec);
500 : syskin 1420
501 : suxen_drol 1632 start_timer();
502 : edgomez 1382
503 : Isibaar 1669 if ((pMB->mode != MODE_INTER4V) || (bvop)) { /* INTER, INTER_Q, NOT_CODED, FORWARD, BACKWARD */
504 : edgomez 1382
505 : suxen_drol 1632 uv_dx = mv[0].x;
506 :     uv_dy = mv[0].y;
507 :     if (dec->quarterpel) {
508 : Isibaar 1628 if (dec->bs_version <= BS_VERSION_BUGGY_CHROMA_ROUNDING) {
509 : Isibaar 1669 uv_dx = (uv_dx>>1) | (uv_dx&1);
510 : Isibaar 1628 uv_dy = (uv_dy>>1) | (uv_dy&1);
511 :     }
512 :     else {
513 : suxen_drol 1632 uv_dx /= 2;
514 :     uv_dy /= 2;
515 :     }
516 :     }
517 :     uv_dx = (uv_dx >> 1) + roundtab_79[uv_dx & 0x3];
518 :     uv_dy = (uv_dy >> 1) + roundtab_79[uv_dy & 0x3];
519 : edgomez 851
520 : suxen_drol 1632 if (dec->quarterpel)
521 :     interpolate16x16_quarterpel(dec->cur.y, dec->refn[ref].y, dec->qtmp.y, dec->qtmp.y + 64,
522 :     dec->qtmp.y + 128, 16*x_pos, 16*y_pos,
523 :     mv[0].x, mv[0].y, stride, rounding);
524 :     else
525 :     interpolate16x16_switch(dec->cur.y, dec->refn[ref].y, 16*x_pos, 16*y_pos,
526 :     mv[0].x, mv[0].y, stride, rounding);
527 : edgomez 851
528 : suxen_drol 1632 } else { /* MODE_INTER4V */
529 : Isibaar 3
530 : suxen_drol 1632 if(dec->quarterpel) {
531 : Isibaar 1628 if (dec->bs_version <= BS_VERSION_BUGGY_CHROMA_ROUNDING) {
532 :     int z;
533 :     uv_dx = 0; uv_dy = 0;
534 :     for (z = 0; z < 4; z++) {
535 :     uv_dx += ((mv[z].x>>1) | (mv[z].x&1));
536 :     uv_dy += ((mv[z].y>>1) | (mv[z].y&1));
537 :     }
538 :     }
539 :     else {
540 : suxen_drol 1632 uv_dx = (mv[0].x / 2) + (mv[1].x / 2) + (mv[2].x / 2) + (mv[3].x / 2);
541 :     uv_dy = (mv[0].y / 2) + (mv[1].y / 2) + (mv[2].y / 2) + (mv[3].y / 2);
542 :     }
543 :     } else {
544 :     uv_dx = mv[0].x + mv[1].x + mv[2].x + mv[3].x;
545 :     uv_dy = mv[0].y + mv[1].y + mv[2].y + mv[3].y;
546 :     }
547 : Isibaar 333
548 : suxen_drol 1632 uv_dx = (uv_dx >> 3) + roundtab_76[uv_dx & 0xf];
549 :     uv_dy = (uv_dy >> 3) + roundtab_76[uv_dy & 0xf];
550 : Isibaar 333
551 : suxen_drol 1632 if (dec->quarterpel) {
552 :     interpolate8x8_quarterpel(dec->cur.y, dec->refn[0].y , dec->qtmp.y, dec->qtmp.y + 64,
553 :     dec->qtmp.y + 128, 16*x_pos, 16*y_pos,
554 :     mv[0].x, mv[0].y, stride, rounding);
555 :     interpolate8x8_quarterpel(dec->cur.y, dec->refn[0].y , dec->qtmp.y, dec->qtmp.y + 64,
556 :     dec->qtmp.y + 128, 16*x_pos + 8, 16*y_pos,
557 :     mv[1].x, mv[1].y, stride, rounding);
558 :     interpolate8x8_quarterpel(dec->cur.y, dec->refn[0].y , dec->qtmp.y, dec->qtmp.y + 64,
559 :     dec->qtmp.y + 128, 16*x_pos, 16*y_pos + 8,
560 :     mv[2].x, mv[2].y, stride, rounding);
561 :     interpolate8x8_quarterpel(dec->cur.y, dec->refn[0].y , dec->qtmp.y, dec->qtmp.y + 64,
562 :     dec->qtmp.y + 128, 16*x_pos + 8, 16*y_pos + 8,
563 :     mv[3].x, mv[3].y, stride, rounding);
564 :     } else {
565 :     interpolate8x8_switch(dec->cur.y, dec->refn[0].y , 16*x_pos, 16*y_pos,
566 :     mv[0].x, mv[0].y, stride, rounding);
567 :     interpolate8x8_switch(dec->cur.y, dec->refn[0].y , 16*x_pos + 8, 16*y_pos,
568 :     mv[1].x, mv[1].y, stride, rounding);
569 :     interpolate8x8_switch(dec->cur.y, dec->refn[0].y , 16*x_pos, 16*y_pos + 8,
570 :     mv[2].x, mv[2].y, stride, rounding);
571 :     interpolate8x8_switch(dec->cur.y, dec->refn[0].y , 16*x_pos + 8, 16*y_pos + 8,
572 :     mv[3].x, mv[3].y, stride, rounding);
573 :     }
574 :     }
575 : Isibaar 3
576 : suxen_drol 1632 /* chroma */
577 :     interpolate8x8_switch(dec->cur.u, dec->refn[ref].u, 8 * x_pos, 8 * y_pos,
578 :     uv_dx, uv_dy, stride2, rounding);
579 :     interpolate8x8_switch(dec->cur.v, dec->refn[ref].v, 8 * x_pos, 8 * y_pos,
580 :     uv_dx, uv_dy, stride2, rounding);
581 : h 69
582 : suxen_drol 1632 stop_comp_timer();
583 : h 69
584 : suxen_drol 1632 if (cbp)
585 :     decoder_mb_decode(dec, cbp, bs, pY_Cur, pU_Cur, pV_Cur, pMB);
586 : edgomez 851 }
587 :    
588 : suxen_drol 1632 /* decode an inter macroblock in field mode */
589 : edgomez 851 static void
590 : suxen_drol 1632 decoder_mbinter_field(DECODER * dec,
591 :     const MACROBLOCK * pMB,
592 :     const uint32_t x_pos,
593 :     const uint32_t y_pos,
594 :     const uint32_t cbp,
595 :     Bitstream * bs,
596 :     const uint32_t rounding,
597 : Isibaar 1669 const int ref,
598 :     const int bvop)
599 : suxen_drol 1632 {
600 :     uint32_t stride = dec->edged_width;
601 :     uint32_t stride2 = stride / 2;
602 :    
603 :     uint8_t *pY_Cur, *pU_Cur, *pV_Cur;
604 :    
605 :     int uvtop_dx, uvtop_dy;
606 :     int uvbot_dx, uvbot_dy;
607 :     VECTOR mv[4]; /* local copy of mvs */
608 :    
609 :     /* Get pointer to memory areas */
610 :     pY_Cur = dec->cur.y + (y_pos << 4) * stride + (x_pos << 4);
611 :     pU_Cur = dec->cur.u + (y_pos << 3) * stride2 + (x_pos << 3);
612 :     pV_Cur = dec->cur.v + (y_pos << 3) * stride2 + (x_pos << 3);
613 :    
614 :     mv[0] = pMB->mvs[0];
615 :     mv[1] = pMB->mvs[1];
616 :     memset(&mv[2],0,2*sizeof(VECTOR));
617 :    
618 :     validate_vector(mv, x_pos, y_pos, dec);
619 :    
620 :     start_timer();
621 :    
622 : Isibaar 1669 if((pMB->mode!=MODE_INTER4V) || (bvop)) /* INTER, INTER_Q, NOT_CODED, FORWARD, BACKWARD */
623 : suxen_drol 1632 {
624 :     /* Prepare top field vector */
625 :     uvtop_dx = DIV2ROUND(mv[0].x);
626 :     uvtop_dy = DIV2ROUND(mv[0].y);
627 :    
628 :     /* Prepare bottom field vector */
629 :     uvbot_dx = DIV2ROUND(mv[1].x);
630 :     uvbot_dy = DIV2ROUND(mv[1].y);
631 :    
632 :     if(dec->quarterpel)
633 :     {
634 :     /* NOT supported */
635 :     }
636 :     else
637 :     {
638 :     /* Interpolate top field left part(we use double stride for every 2nd line) */
639 :     interpolate8x8_switch(dec->cur.y,dec->refn[ref].y+pMB->field_for_top*stride,
640 :     16*x_pos,8*y_pos,mv[0].x, mv[0].y>>1,2*stride, rounding);
641 :     /* top field right part */
642 :     interpolate8x8_switch(dec->cur.y,dec->refn[ref].y+pMB->field_for_top*stride,
643 :     16*x_pos+8,8*y_pos,mv[0].x, mv[0].y>>1,2*stride, rounding);
644 :    
645 :     /* Interpolate bottom field left part(we use double stride for every 2nd line) */
646 :     interpolate8x8_switch(dec->cur.y+stride,dec->refn[ref].y+pMB->field_for_bot*stride,
647 :     16*x_pos,8*y_pos,mv[1].x, mv[1].y>>1,2*stride, rounding);
648 :     /* Bottom field right part */
649 :     interpolate8x8_switch(dec->cur.y+stride,dec->refn[ref].y+pMB->field_for_bot*stride,
650 :     16*x_pos+8,8*y_pos,mv[1].x, mv[1].y>>1,2*stride, rounding);
651 :    
652 :     /* Interpolate field1 U */
653 :     interpolate8x4_switch(dec->cur.u,dec->refn[ref].u+pMB->field_for_top*stride2,
654 :     8*x_pos,4*y_pos,uvtop_dx,DIV2ROUND(uvtop_dy),stride,rounding);
655 :    
656 :     /* Interpolate field1 V */
657 :     interpolate8x4_switch(dec->cur.v,dec->refn[ref].v+pMB->field_for_top*stride2,
658 :     8*x_pos,4*y_pos,uvtop_dx,DIV2ROUND(uvtop_dy),stride,rounding);
659 :    
660 :     /* Interpolate field2 U */
661 :     interpolate8x4_switch(dec->cur.u+stride2,dec->refn[ref].u+pMB->field_for_bot*stride2,
662 :     8*x_pos,4*y_pos,uvbot_dx,DIV2ROUND(uvbot_dy),stride,rounding);
663 :    
664 :     /* Interpolate field2 V */
665 :     interpolate8x4_switch(dec->cur.v+stride2,dec->refn[ref].v+pMB->field_for_bot*stride2,
666 :     8*x_pos,4*y_pos,uvbot_dx,DIV2ROUND(uvbot_dy),stride,rounding);
667 :     }
668 :     }
669 :     else
670 :     {
671 :     /* We don't expect 4 motion vectors in interlaced mode */
672 :     }
673 :    
674 :     stop_comp_timer();
675 :    
676 :     /* Must add error correction? */
677 :     if(cbp)
678 :     decoder_mb_decode(dec, cbp, bs, pY_Cur, pU_Cur, pV_Cur, pMB);
679 :     }
680 :    
681 :     static void
682 : edgomez 851 decoder_mbgmc(DECODER * dec,
683 : suxen_drol 1632 MACROBLOCK * const pMB,
684 :     const uint32_t x_pos,
685 :     const uint32_t y_pos,
686 :     const uint32_t fcode,
687 :     const uint32_t cbp,
688 :     Bitstream * bs,
689 :     const uint32_t rounding)
690 : edgomez 851 {
691 : suxen_drol 1632 const uint32_t stride = dec->edged_width;
692 :     const uint32_t stride2 = stride / 2;
693 : edgomez 1382
694 : suxen_drol 1632 uint8_t *const pY_Cur=dec->cur.y + (y_pos << 4) * stride + (x_pos << 4);
695 :     uint8_t *const pU_Cur=dec->cur.u + (y_pos << 3) * stride2 + (x_pos << 3);
696 :     uint8_t *const pV_Cur=dec->cur.v + (y_pos << 3) * stride2 + (x_pos << 3);
697 : edgomez 851
698 : suxen_drol 1632 NEW_GMC_DATA * gmc_data = &dec->new_gmc_data;
699 : edgomez 1382
700 : suxen_drol 1632 pMB->mvs[0] = pMB->mvs[1] = pMB->mvs[2] = pMB->mvs[3] = pMB->amv;
701 : edgomez 851
702 : suxen_drol 1632 start_timer();
703 : edgomez 1382
704 : edgomez 851 /* this is where the calculations are done */
705 :    
706 : suxen_drol 1632 gmc_data->predict_16x16(gmc_data,
707 :     dec->cur.y + y_pos*16*stride + x_pos*16, dec->refn[0].y,
708 :     stride, stride, x_pos, y_pos, rounding);
709 : edgomez 851
710 : suxen_drol 1632 gmc_data->predict_8x8(gmc_data,
711 :     dec->cur.u + y_pos*8*stride2 + x_pos*8, dec->refn[0].u,
712 :     dec->cur.v + y_pos*8*stride2 + x_pos*8, dec->refn[0].v,
713 :     stride2, stride2, x_pos, y_pos, rounding);
714 : edgomez 851
715 : suxen_drol 1632 gmc_data->get_average_mv(gmc_data, &pMB->amv, x_pos, y_pos, dec->quarterpel);
716 : edgomez 851
717 : suxen_drol 1632 pMB->amv.x = gmc_sanitize(pMB->amv.x, dec->quarterpel, fcode);
718 :     pMB->amv.y = gmc_sanitize(pMB->amv.y, dec->quarterpel, fcode);
719 : edgomez 851
720 : suxen_drol 1632 pMB->mvs[0] = pMB->mvs[1] = pMB->mvs[2] = pMB->mvs[3] = pMB->amv;
721 : edgomez 851
722 : suxen_drol 1632 stop_transfer_timer();
723 : edgomez 851
724 : suxen_drol 1632 if (cbp)
725 :     decoder_mb_decode(dec, cbp, bs, pY_Cur, pU_Cur, pV_Cur, pMB);
726 : edgomez 851
727 : Isibaar 3 }
728 :    
729 :    
730 : edgomez 1382 static void
731 : edgomez 195 decoder_iframe(DECODER * dec,
732 : suxen_drol 1632 Bitstream * bs,
733 :     int quant,
734 :     int intra_dc_threshold)
735 : Isibaar 3 {
736 : suxen_drol 1632 uint32_t bound;
737 :     uint32_t x, y;
738 :     const uint32_t mb_width = dec->mb_width;
739 :     const uint32_t mb_height = dec->mb_height;
740 : edgomez 1382
741 : suxen_drol 1632 bound = 0;
742 : chenm001 272
743 : suxen_drol 1632 for (y = 0; y < mb_height; y++) {
744 :     for (x = 0; x < mb_width; x++) {
745 :     MACROBLOCK *mb;
746 :     uint32_t mcbpc;
747 :     uint32_t cbpc;
748 :     uint32_t acpred_flag;
749 :     uint32_t cbpy;
750 :     uint32_t cbp;
751 : Isibaar 3
752 : suxen_drol 1632 while (BitstreamShowBits(bs, 9) == 1)
753 :     BitstreamSkip(bs, 9);
754 : chenm001 272
755 : suxen_drol 1632 if (check_resync_marker(bs, 0))
756 :     {
757 :     bound = read_video_packet_header(bs, dec, 0,
758 :     &quant, NULL, NULL, &intra_dc_threshold);
759 :     x = bound % mb_width;
760 : Isibaar 1868 y = MIN((bound / mb_width), (mb_height-1));
761 : suxen_drol 1632 }
762 :     mb = &dec->mbs[y * dec->mb_width + x];
763 : chenm001 272
764 : suxen_drol 1632 DPRINTF(XVID_DEBUG_MB, "macroblock (%i,%i) %08x\n", x, y, BitstreamShowBits(bs, 32));
765 : chenm001 272
766 : suxen_drol 1632 mcbpc = get_mcbpc_intra(bs);
767 :     mb->mode = mcbpc & 7;
768 :     cbpc = (mcbpc >> 4);
769 : Isibaar 3
770 : suxen_drol 1632 acpred_flag = BitstreamGetBit(bs);
771 : Isibaar 3
772 : suxen_drol 1632 cbpy = get_cbpy(bs, 1);
773 :     cbp = (cbpy << 2) | cbpc;
774 : Isibaar 3
775 : suxen_drol 1632 if (mb->mode == MODE_INTRA_Q) {
776 :     quant += dquant_table[BitstreamGetBits(bs, 2)];
777 :     if (quant > 31) {
778 :     quant = 31;
779 :     } else if (quant < 1) {
780 :     quant = 1;
781 :     }
782 :     }
783 :     mb->quant = quant;
784 :     mb->mvs[0].x = mb->mvs[0].y =
785 :     mb->mvs[1].x = mb->mvs[1].y =
786 :     mb->mvs[2].x = mb->mvs[2].y =
787 :     mb->mvs[3].x = mb->mvs[3].y =0;
788 : Isibaar 3
789 : suxen_drol 1632 if (dec->interlacing) {
790 :     mb->field_dct = BitstreamGetBit(bs);
791 :     DPRINTF(XVID_DEBUG_MB,"deci: field_dct: %i\n", mb->field_dct);
792 :     }
793 : h 69
794 : suxen_drol 1632 decoder_mbintra(dec, mb, x, y, acpred_flag, cbp, bs, quant,
795 :     intra_dc_threshold, bound);
796 : edgomez 851
797 : suxen_drol 1632 }
798 :     if(dec->out_frm)
799 :     output_slice(&dec->cur, dec->edged_width,dec->width,dec->out_frm,0,y,mb_width);
800 :     }
801 : edgomez 78
802 : Isibaar 3 }
803 :    
804 :    
805 : edgomez 1382 static void
806 : edgomez 195 get_motion_vector(DECODER * dec,
807 : suxen_drol 1632 Bitstream * bs,
808 :     int x,
809 :     int y,
810 :     int k,
811 :     VECTOR * ret_mv,
812 :     int fcode,
813 :     const int bound)
814 : Isibaar 3 {
815 : edgomez 78
816 : suxen_drol 1632 const int scale_fac = 1 << (fcode - 1);
817 :     const int high = (32 * scale_fac) - 1;
818 :     const int low = ((-32) * scale_fac);
819 :     const int range = (64 * scale_fac);
820 : Isibaar 3
821 : suxen_drol 1632 const VECTOR pmv = get_pmv2(dec->mbs, dec->mb_width, bound, x, y, k);
822 :     VECTOR mv;
823 : Isibaar 3
824 : suxen_drol 1632 mv.x = get_mv(bs, fcode);
825 :     mv.y = get_mv(bs, fcode);
826 : edgomez 195
827 : suxen_drol 1632 DPRINTF(XVID_DEBUG_MV,"mv_diff (%i,%i) pred (%i,%i) result (%i,%i)\n", mv.x, mv.y, pmv.x, pmv.y, mv.x+pmv.x, mv.y+pmv.y);
828 : suxen_drol 252
829 : suxen_drol 1632 mv.x += pmv.x;
830 :     mv.y += pmv.y;
831 : chenm001 272
832 : suxen_drol 1632 if (mv.x < low) {
833 :     mv.x += range;
834 :     } else if (mv.x > high) {
835 :     mv.x -= range;
836 :     }
837 : Isibaar 3
838 : suxen_drol 1632 if (mv.y < low) {
839 :     mv.y += range;
840 :     } else if (mv.y > high) {
841 :     mv.y -= range;
842 :     }
843 : Isibaar 3
844 : suxen_drol 1632 ret_mv->x = mv.x;
845 :     ret_mv->y = mv.y;
846 : edgomez 1382 }
847 : edgomez 851
848 : suxen_drol 1632 /* We use this when decoder runs interlaced -> different prediction */
849 :    
850 :     static void get_motion_vector_interlaced(DECODER * dec,
851 :     Bitstream * bs,
852 :     int x,
853 :     int y,
854 :     int k,
855 :     MACROBLOCK *pMB,
856 :     int fcode,
857 :     const int bound)
858 :     {
859 :     const int scale_fac = 1 << (fcode - 1);
860 :     const int high = (32 * scale_fac) - 1;
861 :     const int low = ((-32) * scale_fac);
862 :     const int range = (64 * scale_fac);
863 :    
864 :     /* Get interlaced prediction */
865 :     const VECTOR pmv=get_pmv2_interlaced(dec->mbs,dec->mb_width,bound,x,y,k);
866 :     VECTOR mv,mvf1,mvf2;
867 :    
868 :     if(!pMB->field_pred)
869 :     {
870 :     mv.x = get_mv(bs,fcode);
871 :     mv.y = get_mv(bs,fcode);
872 :    
873 :     mv.x += pmv.x;
874 :     mv.y += pmv.y;
875 :    
876 :     if(mv.x<low) {
877 :     mv.x += range;
878 :     } else if (mv.x>high) {
879 :     mv.x-=range;
880 :     }
881 :    
882 :     if (mv.y < low) {
883 :     mv.y += range;
884 :     } else if (mv.y > high) {
885 :     mv.y -= range;
886 :     }
887 :    
888 :     pMB->mvs[0]=pMB->mvs[1]=pMB->mvs[2]=pMB->mvs[3]=mv;
889 :     }
890 :     else
891 :     {
892 :     mvf1.x = get_mv(bs, fcode);
893 :     mvf1.y = get_mv(bs, fcode);
894 :    
895 :     mvf1.x += pmv.x;
896 :     mvf1.y = 2*(mvf1.y+pmv.y/2); /* It's multiple of 2 */
897 :    
898 :     if (mvf1.x < low) {
899 :     mvf1.x += range;
900 :     } else if (mvf1.x > high) {
901 :     mvf1.x -= range;
902 :     }
903 :    
904 :     if (mvf1.y < low) {
905 :     mvf1.y += range;
906 :     } else if (mvf1.y > high) {
907 :     mvf1.y -= range;
908 :     }
909 :    
910 :     mvf2.x = get_mv(bs, fcode);
911 :     mvf2.y = get_mv(bs, fcode);
912 :    
913 :     mvf2.x += pmv.x;
914 :     mvf2.y = 2*(mvf2.y+pmv.y/2); /* It's multiple of 2 */
915 :    
916 :     if (mvf2.x < low) {
917 :     mvf2.x += range;
918 :     } else if (mvf2.x > high) {
919 :     mvf2.x -= range;
920 :     }
921 :    
922 :     if (mvf2.y < low) {
923 :     mvf2.y += range;
924 :     } else if (mvf2.y > high) {
925 :     mvf2.y -= range;
926 :     }
927 :    
928 :     pMB->mvs[0]=mvf1;
929 :     pMB->mvs[1]=mvf2;
930 :     pMB->mvs[2].x=pMB->mvs[3].x=0;
931 :     pMB->mvs[2].y=pMB->mvs[3].y=0;
932 :    
933 :     /* Calculate average for as it is field predicted */
934 :     pMB->mvs_avg.x=DIV2ROUND(pMB->mvs[0].x+pMB->mvs[1].x);
935 :     pMB->mvs_avg.y=DIV2ROUND(pMB->mvs[0].y+pMB->mvs[1].y);
936 :     }
937 :     }
938 :    
939 : edgomez 851 /* for P_VOP set gmc_warp to NULL */
940 : edgomez 1382 static void
941 : edgomez 195 decoder_pframe(DECODER * dec,
942 : suxen_drol 1632 Bitstream * bs,
943 :     int rounding,
944 :     int quant,
945 :     int fcode,
946 :     int intra_dc_threshold,
947 :     const WARPPOINTS *const gmc_warp)
948 : Isibaar 3 {
949 : suxen_drol 1632 uint32_t x, y;
950 :     uint32_t bound;
951 :     int cp_mb, st_mb;
952 :     const uint32_t mb_width = dec->mb_width;
953 :     const uint32_t mb_height = dec->mb_height;
954 : edgomez 1382
955 : suxen_drol 1632 if (!dec->is_edged[0]) {
956 :     start_timer();
957 :     image_setedges(&dec->refn[0], dec->edged_width, dec->edged_height,
958 :     dec->width, dec->height, dec->bs_version);
959 :     dec->is_edged[0] = 1;
960 :     stop_edges_timer();
961 :     }
962 : Isibaar 3
963 : suxen_drol 1632 if (gmc_warp) {
964 :     /* accuracy: 0==1/2, 1=1/4, 2=1/8, 3=1/16 */
965 :     generate_GMCparameters( dec->sprite_warping_points,
966 :     dec->sprite_warping_accuracy, gmc_warp,
967 :     dec->width, dec->height, &dec->new_gmc_data);
968 : edgomez 851
969 : suxen_drol 1632 /* image warping is done block-based in decoder_mbgmc(), now */
970 :     }
971 : edgomez 851
972 : suxen_drol 1632 bound = 0;
973 : chenm001 272
974 : suxen_drol 1632 for (y = 0; y < mb_height; y++) {
975 :     cp_mb = st_mb = 0;
976 :     for (x = 0; x < mb_width; x++) {
977 :     MACROBLOCK *mb;
978 : Isibaar 3
979 : suxen_drol 1632 /* skip stuffing */
980 :     while (BitstreamShowBits(bs, 10) == 1)
981 :     BitstreamSkip(bs, 10);
982 : chenm001 272
983 : suxen_drol 1632 if (check_resync_marker(bs, fcode - 1)) {
984 :     bound = read_video_packet_header(bs, dec, fcode - 1,
985 :     &quant, &fcode, NULL, &intra_dc_threshold);
986 :     x = bound % mb_width;
987 : Isibaar 1868 y = MIN((bound / mb_width), (mb_height-1));
988 : suxen_drol 1632 }
989 :     mb = &dec->mbs[y * dec->mb_width + x];
990 : chenm001 272
991 : suxen_drol 1632 DPRINTF(XVID_DEBUG_MB, "macroblock (%i,%i) %08x\n", x, y, BitstreamShowBits(bs, 32));
992 : chenm001 272
993 : suxen_drol 1632 if (!(BitstreamGetBit(bs))) { /* block _is_ coded */
994 :     uint32_t mcbpc, cbpc, cbpy, cbp;
995 :     uint32_t intra, acpred_flag = 0;
996 :     int mcsel = 0; /* mcsel: '0'=local motion, '1'=GMC */
997 : Isibaar 3
998 : suxen_drol 1632 cp_mb++;
999 :     mcbpc = get_mcbpc_inter(bs);
1000 :     mb->mode = mcbpc & 7;
1001 :     cbpc = (mcbpc >> 4);
1002 : Isibaar 3
1003 : suxen_drol 1632 DPRINTF(XVID_DEBUG_MB, "mode %i\n", mb->mode);
1004 :     DPRINTF(XVID_DEBUG_MB, "cbpc %i\n", cbpc);
1005 : edgomez 1382
1006 : suxen_drol 1632 intra = (mb->mode == MODE_INTRA || mb->mode == MODE_INTRA_Q);
1007 : edgomez 195
1008 : suxen_drol 1632 if (gmc_warp && (mb->mode == MODE_INTER || mb->mode == MODE_INTER_Q))
1009 :     mcsel = BitstreamGetBit(bs);
1010 :     else if (intra)
1011 :     acpred_flag = BitstreamGetBit(bs);
1012 : edgomez 851
1013 : suxen_drol 1632 cbpy = get_cbpy(bs, intra);
1014 :     DPRINTF(XVID_DEBUG_MB, "cbpy %i mcsel %i \n", cbpy,mcsel);
1015 : chenm001 272
1016 : suxen_drol 1632 cbp = (cbpy << 2) | cbpc;
1017 : Isibaar 3
1018 : suxen_drol 1632 if (mb->mode == MODE_INTER_Q || mb->mode == MODE_INTRA_Q) {
1019 :     int dquant = dquant_table[BitstreamGetBits(bs, 2)];
1020 :     DPRINTF(XVID_DEBUG_MB, "dquant %i\n", dquant);
1021 :     quant += dquant;
1022 :     if (quant > 31) {
1023 :     quant = 31;
1024 :     } else if (quant < 1) {
1025 :     quant = 1;
1026 :     }
1027 :     DPRINTF(XVID_DEBUG_MB, "quant %i\n", quant);
1028 :     }
1029 :     mb->quant = quant;
1030 : h 69
1031 : suxen_drol 1632 mb->field_pred=0;
1032 :     if (dec->interlacing) {
1033 :     if (cbp || intra) {
1034 :     mb->field_dct = BitstreamGetBit(bs);
1035 :     DPRINTF(XVID_DEBUG_MB,"decp: field_dct: %i\n", mb->field_dct);
1036 :     }
1037 : Isibaar 3
1038 : suxen_drol 1632 if ((mb->mode == MODE_INTER || mb->mode == MODE_INTER_Q) && !mcsel) {
1039 :     mb->field_pred = BitstreamGetBit(bs);
1040 :     DPRINTF(XVID_DEBUG_MB, "decp: field_pred: %i\n", mb->field_pred);
1041 : h 69
1042 : suxen_drol 1632 if (mb->field_pred) {
1043 :     mb->field_for_top = BitstreamGetBit(bs);
1044 :     DPRINTF(XVID_DEBUG_MB,"decp: field_for_top: %i\n", mb->field_for_top);
1045 :     mb->field_for_bot = BitstreamGetBit(bs);
1046 :     DPRINTF(XVID_DEBUG_MB,"decp: field_for_bot: %i\n", mb->field_for_bot);
1047 :     }
1048 :     }
1049 :     }
1050 : edgomez 1382
1051 : suxen_drol 1632 if (mcsel) {
1052 :     decoder_mbgmc(dec, mb, x, y, fcode, cbp, bs, rounding);
1053 :     continue;
1054 : h 69
1055 : suxen_drol 1632 } else if (mb->mode == MODE_INTER || mb->mode == MODE_INTER_Q) {
1056 : edgomez 851
1057 : suxen_drol 1632 if(dec->interlacing) {
1058 :     /* Get motion vectors interlaced, field_pred is handled there */
1059 :     get_motion_vector_interlaced(dec, bs, x, y, 0, mb, fcode, bound);
1060 :     } else {
1061 :     get_motion_vector(dec, bs, x, y, 0, &mb->mvs[0], fcode, bound);
1062 :     mb->mvs[1] = mb->mvs[2] = mb->mvs[3] = mb->mvs[0];
1063 :     }
1064 :     } else if (mb->mode == MODE_INTER4V ) {
1065 :     /* interlaced missing here */
1066 :     get_motion_vector(dec, bs, x, y, 0, &mb->mvs[0], fcode, bound);
1067 :     get_motion_vector(dec, bs, x, y, 1, &mb->mvs[1], fcode, bound);
1068 :     get_motion_vector(dec, bs, x, y, 2, &mb->mvs[2], fcode, bound);
1069 :     get_motion_vector(dec, bs, x, y, 3, &mb->mvs[3], fcode, bound);
1070 :     } else { /* MODE_INTRA, MODE_INTRA_Q */
1071 :     mb->mvs[0].x = mb->mvs[1].x = mb->mvs[2].x = mb->mvs[3].x = 0;
1072 :     mb->mvs[0].y = mb->mvs[1].y = mb->mvs[2].y = mb->mvs[3].y = 0;
1073 :     decoder_mbintra(dec, mb, x, y, acpred_flag, cbp, bs, quant,
1074 :     intra_dc_threshold, bound);
1075 :     continue;
1076 :     }
1077 : Isibaar 3
1078 : suxen_drol 1632 /* See how to decode */
1079 :     if(!mb->field_pred)
1080 : Isibaar 1669 decoder_mbinter(dec, mb, x, y, cbp, bs, rounding, 0, 0);
1081 : suxen_drol 1632 else
1082 : Isibaar 1669 decoder_mbinter_field(dec, mb, x, y, cbp, bs, rounding, 0, 0);
1083 : edgomez 851
1084 : suxen_drol 1632 } else if (gmc_warp) { /* a not coded S(GMC)-VOP macroblock */
1085 :     mb->mode = MODE_NOT_CODED_GMC;
1086 :     mb->quant = quant;
1087 :     decoder_mbgmc(dec, mb, x, y, fcode, 0x00, bs, rounding);
1088 : edgomez 514
1089 : suxen_drol 1632 if(dec->out_frm && cp_mb > 0) {
1090 :     output_slice(&dec->cur, dec->edged_width,dec->width,dec->out_frm,st_mb,y,cp_mb);
1091 :     cp_mb = 0;
1092 :     }
1093 :     st_mb = x+1;
1094 :     } else { /* not coded P_VOP macroblock */
1095 :     mb->mode = MODE_NOT_CODED;
1096 :     mb->quant = quant;
1097 : edgomez 851
1098 : suxen_drol 1632 mb->mvs[0].x = mb->mvs[1].x = mb->mvs[2].x = mb->mvs[3].x = 0;
1099 :     mb->mvs[0].y = mb->mvs[1].y = mb->mvs[2].y = mb->mvs[3].y = 0;
1100 :     mb->field_pred=0; /* (!) */
1101 : edgomez 195
1102 : suxen_drol 1632 decoder_mbinter(dec, mb, x, y, 0, bs,
1103 : Isibaar 1669 rounding, 0, 0);
1104 : Isibaar 3
1105 : suxen_drol 1632 if(dec->out_frm && cp_mb > 0) {
1106 :     output_slice(&dec->cur, dec->edged_width,dec->width,dec->out_frm,st_mb,y,cp_mb);
1107 :     cp_mb = 0;
1108 :     }
1109 :     st_mb = x+1;
1110 :     }
1111 :     }
1112 : edgomez 1382
1113 : suxen_drol 1632 if(dec->out_frm && cp_mb > 0)
1114 :     output_slice(&dec->cur, dec->edged_width,dec->width,dec->out_frm,st_mb,y,cp_mb);
1115 :     }
1116 : Isibaar 3 }
1117 :    
1118 : edgomez 851
1119 : edgomez 866 /* decode B-frame motion vector */
1120 : edgomez 1382 static void
1121 :     get_b_motion_vector(Bitstream * bs,
1122 : suxen_drol 1632 VECTOR * mv,
1123 :     int fcode,
1124 :     const VECTOR pmv,
1125 :     const DECODER * const dec,
1126 :     const int x, const int y)
1127 : edgomez 851 {
1128 : suxen_drol 1632 const int scale_fac = 1 << (fcode - 1);
1129 :     const int high = (32 * scale_fac) - 1;
1130 :     const int low = ((-32) * scale_fac);
1131 :     const int range = (64 * scale_fac);
1132 : edgomez 851
1133 : suxen_drol 1632 int mv_x = get_mv(bs, fcode);
1134 :     int mv_y = get_mv(bs, fcode);
1135 : edgomez 851
1136 : suxen_drol 1632 mv_x += pmv.x;
1137 :     mv_y += pmv.y;
1138 : edgomez 851
1139 : suxen_drol 1632 if (mv_x < low)
1140 :     mv_x += range;
1141 :     else if (mv_x > high)
1142 :     mv_x -= range;
1143 : edgomez 851
1144 : suxen_drol 1632 if (mv_y < low)
1145 :     mv_y += range;
1146 :     else if (mv_y > high)
1147 :     mv_y -= range;
1148 : edgomez 851
1149 : suxen_drol 1632 mv->x = mv_x;
1150 :     mv->y = mv_y;
1151 : edgomez 851 }
1152 :    
1153 : edgomez 1382 /* decode an B-frame direct & interpolate macroblock */
1154 :     static void
1155 : edgomez 851 decoder_bf_interpolate_mbinter(DECODER * dec,
1156 : suxen_drol 1632 IMAGE forward,
1157 :     IMAGE backward,
1158 :     MACROBLOCK * pMB,
1159 :     const uint32_t x_pos,
1160 :     const uint32_t y_pos,
1161 :     Bitstream * bs,
1162 :     const int direct)
1163 : edgomez 851 {
1164 : suxen_drol 1632 uint32_t stride = dec->edged_width;
1165 :     uint32_t stride2 = stride / 2;
1166 :     int uv_dx, uv_dy;
1167 :     int b_uv_dx, b_uv_dy;
1168 :     uint8_t *pY_Cur, *pU_Cur, *pV_Cur;
1169 :     const uint32_t cbp = pMB->cbp;
1170 : edgomez 851
1171 : suxen_drol 1632 pY_Cur = dec->cur.y + (y_pos << 4) * stride + (x_pos << 4);
1172 :     pU_Cur = dec->cur.u + (y_pos << 3) * stride2 + (x_pos << 3);
1173 :     pV_Cur = dec->cur.v + (y_pos << 3) * stride2 + (x_pos << 3);
1174 : edgomez 851
1175 : suxen_drol 1632 validate_vector(pMB->mvs, x_pos, y_pos, dec);
1176 :     validate_vector(pMB->b_mvs, x_pos, y_pos, dec);
1177 : syskin 1532
1178 : suxen_drol 1632 if (!direct) {
1179 :     uv_dx = pMB->mvs[0].x;
1180 :     uv_dy = pMB->mvs[0].y;
1181 :     b_uv_dx = pMB->b_mvs[0].x;
1182 :     b_uv_dy = pMB->b_mvs[0].y;
1183 : edgomez 851
1184 : suxen_drol 1632 if (dec->quarterpel) {
1185 : Isibaar 1628 if (dec->bs_version <= BS_VERSION_BUGGY_CHROMA_ROUNDING) {
1186 :     uv_dx = (uv_dx>>1) | (uv_dx&1);
1187 :     uv_dy = (uv_dy>>1) | (uv_dy&1);
1188 :     b_uv_dx = (b_uv_dx>>1) | (b_uv_dx&1);
1189 :     b_uv_dy = (b_uv_dy>>1) | (b_uv_dy&1);
1190 :     }
1191 :     else {
1192 : suxen_drol 1632 uv_dx /= 2;
1193 :     uv_dy /= 2;
1194 :     b_uv_dx /= 2;
1195 :     b_uv_dy /= 2;
1196 :     }
1197 :     }
1198 : edgomez 851
1199 : suxen_drol 1632 uv_dx = (uv_dx >> 1) + roundtab_79[uv_dx & 0x3];
1200 :     uv_dy = (uv_dy >> 1) + roundtab_79[uv_dy & 0x3];
1201 :     b_uv_dx = (b_uv_dx >> 1) + roundtab_79[b_uv_dx & 0x3];
1202 :     b_uv_dy = (b_uv_dy >> 1) + roundtab_79[b_uv_dy & 0x3];
1203 : edgomez 1382
1204 : suxen_drol 1632 } else {
1205 : Isibaar 1669 if (dec->quarterpel) { /* for qpel the /2 shall be done before summation. We've done it right in the encoder in the past. */
1206 :     /* TODO: figure out if we ever did it wrong on the encoder side. If yes, add some workaround */
1207 :     if (dec->bs_version <= BS_VERSION_BUGGY_CHROMA_ROUNDING) {
1208 :     int z;
1209 :     uv_dx = 0; uv_dy = 0;
1210 :     b_uv_dx = 0; b_uv_dy = 0;
1211 :     for (z = 0; z < 4; z++) {
1212 :     uv_dx += ((pMB->mvs[z].x>>1) | (pMB->mvs[z].x&1));
1213 :     uv_dy += ((pMB->mvs[z].y>>1) | (pMB->mvs[z].y&1));
1214 :     b_uv_dx += ((pMB->b_mvs[z].x>>1) | (pMB->b_mvs[z].x&1));
1215 :     b_uv_dy += ((pMB->b_mvs[z].y>>1) | (pMB->b_mvs[z].y&1));
1216 : Isibaar 1628 }
1217 : Isibaar 1669 }
1218 :     else {
1219 :     uv_dx = (pMB->mvs[0].x / 2) + (pMB->mvs[1].x / 2) + (pMB->mvs[2].x / 2) + (pMB->mvs[3].x / 2);
1220 :     uv_dy = (pMB->mvs[0].y / 2) + (pMB->mvs[1].y / 2) + (pMB->mvs[2].y / 2) + (pMB->mvs[3].y / 2);
1221 :     b_uv_dx = (pMB->b_mvs[0].x / 2) + (pMB->b_mvs[1].x / 2) + (pMB->b_mvs[2].x / 2) + (pMB->b_mvs[3].x / 2);
1222 :     b_uv_dy = (pMB->b_mvs[0].y / 2) + (pMB->b_mvs[1].y / 2) + (pMB->b_mvs[2].y / 2) + (pMB->b_mvs[3].y / 2);
1223 :     }
1224 :     } else {
1225 :     uv_dx = pMB->mvs[0].x + pMB->mvs[1].x + pMB->mvs[2].x + pMB->mvs[3].x;
1226 :     uv_dy = pMB->mvs[0].y + pMB->mvs[1].y + pMB->mvs[2].y + pMB->mvs[3].y;
1227 :     b_uv_dx = pMB->b_mvs[0].x + pMB->b_mvs[1].x + pMB->b_mvs[2].x + pMB->b_mvs[3].x;
1228 :     b_uv_dy = pMB->b_mvs[0].y + pMB->b_mvs[1].y + pMB->b_mvs[2].y + pMB->b_mvs[3].y;
1229 : suxen_drol 1632 }
1230 : edgomez 851
1231 : suxen_drol 1632 uv_dx = (uv_dx >> 3) + roundtab_76[uv_dx & 0xf];
1232 :     uv_dy = (uv_dy >> 3) + roundtab_76[uv_dy & 0xf];
1233 :     b_uv_dx = (b_uv_dx >> 3) + roundtab_76[b_uv_dx & 0xf];
1234 :     b_uv_dy = (b_uv_dy >> 3) + roundtab_76[b_uv_dy & 0xf];
1235 :     }
1236 : edgomez 851
1237 : suxen_drol 1632 start_timer();
1238 :     if(dec->quarterpel) {
1239 :     if(!direct) {
1240 :     interpolate16x16_quarterpel(dec->cur.y, forward.y, dec->qtmp.y, dec->qtmp.y + 64,
1241 :     dec->qtmp.y + 128, 16*x_pos, 16*y_pos,
1242 :     pMB->mvs[0].x, pMB->mvs[0].y, stride, 0);
1243 :     } else {
1244 :     interpolate8x8_quarterpel(dec->cur.y, forward.y, dec->qtmp.y, dec->qtmp.y + 64,
1245 :     dec->qtmp.y + 128, 16*x_pos, 16*y_pos,
1246 :     pMB->mvs[0].x, pMB->mvs[0].y, stride, 0);
1247 :     interpolate8x8_quarterpel(dec->cur.y, forward.y, dec->qtmp.y, dec->qtmp.y + 64,
1248 :     dec->qtmp.y + 128, 16*x_pos + 8, 16*y_pos,
1249 :     pMB->mvs[1].x, pMB->mvs[1].y, stride, 0);
1250 :     interpolate8x8_quarterpel(dec->cur.y, forward.y, dec->qtmp.y, dec->qtmp.y + 64,
1251 :     dec->qtmp.y + 128, 16*x_pos, 16*y_pos + 8,
1252 :     pMB->mvs[2].x, pMB->mvs[2].y, stride, 0);
1253 :     interpolate8x8_quarterpel(dec->cur.y, forward.y, dec->qtmp.y, dec->qtmp.y + 64,
1254 :     dec->qtmp.y + 128, 16*x_pos + 8, 16*y_pos + 8,
1255 :     pMB->mvs[3].x, pMB->mvs[3].y, stride, 0);
1256 :     }
1257 :     } else {
1258 :     interpolate8x8_switch(dec->cur.y, forward.y, 16 * x_pos, 16 * y_pos,
1259 :     pMB->mvs[0].x, pMB->mvs[0].y, stride, 0);
1260 :     interpolate8x8_switch(dec->cur.y, forward.y, 16 * x_pos + 8, 16 * y_pos,
1261 :     pMB->mvs[1].x, pMB->mvs[1].y, stride, 0);
1262 :     interpolate8x8_switch(dec->cur.y, forward.y, 16 * x_pos, 16 * y_pos + 8,
1263 :     pMB->mvs[2].x, pMB->mvs[2].y, stride, 0);
1264 :     interpolate8x8_switch(dec->cur.y, forward.y, 16 * x_pos + 8, 16 * y_pos + 8,
1265 :     pMB->mvs[3].x, pMB->mvs[3].y, stride, 0);
1266 :     }
1267 : edgomez 851
1268 : suxen_drol 1632 interpolate8x8_switch(dec->cur.u, forward.u, 8 * x_pos, 8 * y_pos, uv_dx,
1269 :     uv_dy, stride2, 0);
1270 :     interpolate8x8_switch(dec->cur.v, forward.v, 8 * x_pos, 8 * y_pos, uv_dx,
1271 :     uv_dy, stride2, 0);
1272 : edgomez 851
1273 :    
1274 : suxen_drol 1632 if(dec->quarterpel) {
1275 :     if(!direct) {
1276 :     interpolate16x16_add_quarterpel(dec->cur.y, backward.y, dec->qtmp.y, dec->qtmp.y + 64,
1277 :     dec->qtmp.y + 128, 16*x_pos, 16*y_pos,
1278 :     pMB->b_mvs[0].x, pMB->b_mvs[0].y, stride, 0);
1279 :     } else {
1280 :     interpolate8x8_add_quarterpel(dec->cur.y, backward.y, dec->qtmp.y, dec->qtmp.y + 64,
1281 :     dec->qtmp.y + 128, 16*x_pos, 16*y_pos,
1282 :     pMB->b_mvs[0].x, pMB->b_mvs[0].y, stride, 0);
1283 :     interpolate8x8_add_quarterpel(dec->cur.y, backward.y, dec->qtmp.y, dec->qtmp.y + 64,
1284 :     dec->qtmp.y + 128, 16*x_pos + 8, 16*y_pos,
1285 :     pMB->b_mvs[1].x, pMB->b_mvs[1].y, stride, 0);
1286 :     interpolate8x8_add_quarterpel(dec->cur.y, backward.y, dec->qtmp.y, dec->qtmp.y + 64,
1287 :     dec->qtmp.y + 128, 16*x_pos, 16*y_pos + 8,
1288 :     pMB->b_mvs[2].x, pMB->b_mvs[2].y, stride, 0);
1289 :     interpolate8x8_add_quarterpel(dec->cur.y, backward.y, dec->qtmp.y, dec->qtmp.y + 64,
1290 :     dec->qtmp.y + 128, 16*x_pos + 8, 16*y_pos + 8,
1291 :     pMB->b_mvs[3].x, pMB->b_mvs[3].y, stride, 0);
1292 :     }
1293 :     } else {
1294 :     interpolate8x8_add_switch(dec->cur.y, backward.y, 16 * x_pos, 16 * y_pos,
1295 :     pMB->b_mvs[0].x, pMB->b_mvs[0].y, stride, 0);
1296 :     interpolate8x8_add_switch(dec->cur.y, backward.y, 16 * x_pos + 8,
1297 :     16 * y_pos, pMB->b_mvs[1].x, pMB->b_mvs[1].y, stride, 0);
1298 :     interpolate8x8_add_switch(dec->cur.y, backward.y, 16 * x_pos,
1299 :     16 * y_pos + 8, pMB->b_mvs[2].x, pMB->b_mvs[2].y, stride, 0);
1300 :     interpolate8x8_add_switch(dec->cur.y, backward.y, 16 * x_pos + 8,
1301 :     16 * y_pos + 8, pMB->b_mvs[3].x, pMB->b_mvs[3].y, stride, 0);
1302 :     }
1303 : edgomez 851
1304 : suxen_drol 1632 interpolate8x8_add_switch(dec->cur.u, backward.u, 8 * x_pos, 8 * y_pos,
1305 :     b_uv_dx, b_uv_dy, stride2, 0);
1306 :     interpolate8x8_add_switch(dec->cur.v, backward.v, 8 * x_pos, 8 * y_pos,
1307 :     b_uv_dx, b_uv_dy, stride2, 0);
1308 : edgomez 851
1309 : suxen_drol 1632 stop_comp_timer();
1310 : edgomez 851
1311 : suxen_drol 1632 if (cbp)
1312 :     decoder_mb_decode(dec, cbp, bs, pY_Cur, pU_Cur, pV_Cur, pMB);
1313 : edgomez 851 }
1314 :    
1315 : edgomez 866 /* for decode B-frame dbquant */
1316 : edgomez 1382 static __inline int32_t
1317 : edgomez 851 get_dbquant(Bitstream * bs)
1318 :     {
1319 : suxen_drol 1632 if (!BitstreamGetBit(bs)) /* '0' */
1320 :     return (0);
1321 :     else if (!BitstreamGetBit(bs)) /* '10' */
1322 :     return (-2);
1323 :     else /* '11' */
1324 :     return (2);
1325 : edgomez 851 }
1326 :    
1327 : edgomez 866 /*
1328 : edgomez 1382 * decode B-frame mb_type
1329 : suxen_drol 1632 * bit ret_value
1330 :     * 1 0
1331 :     * 01 1
1332 :     * 001 2
1333 :     * 0001 3
1334 : edgomez 866 */
1335 : edgomez 1382 static int32_t __inline
1336 : edgomez 851 get_mbtype(Bitstream * bs)
1337 :     {
1338 : suxen_drol 1632 int32_t mb_type;
1339 : edgomez 851
1340 : suxen_drol 1632 for (mb_type = 0; mb_type <= 3; mb_type++)
1341 :     if (BitstreamGetBit(bs))
1342 :     return (mb_type);
1343 : edgomez 851
1344 : suxen_drol 1632 return -1;
1345 : edgomez 851 }
1346 :    
1347 : Skal 1772 static int __inline get_resync_len_b(const int fcode_backward,
1348 :     const int fcode_forward) {
1349 :     int resync_len = ((fcode_forward>fcode_backward) ? fcode_forward : fcode_backward) - 1;
1350 :     if (resync_len < 1) resync_len = 1;
1351 :     return resync_len;
1352 :     }
1353 :    
1354 : edgomez 1382 static void
1355 : edgomez 851 decoder_bframe(DECODER * dec,
1356 : suxen_drol 1632 Bitstream * bs,
1357 :     int quant,
1358 :     int fcode_forward,
1359 :     int fcode_backward)
1360 : edgomez 851 {
1361 : suxen_drol 1632 uint32_t x, y;
1362 :     VECTOR mv;
1363 :     const VECTOR zeromv = {0,0};
1364 :     int i;
1365 : Skal 1772 int resync_len;
1366 : edgomez 851
1367 : suxen_drol 1632 if (!dec->is_edged[0]) {
1368 :     start_timer();
1369 :     image_setedges(&dec->refn[0], dec->edged_width, dec->edged_height,
1370 :     dec->width, dec->height, dec->bs_version);
1371 :     dec->is_edged[0] = 1;
1372 :     stop_edges_timer();
1373 :     }
1374 : edgomez 851
1375 : suxen_drol 1632 if (!dec->is_edged[1]) {
1376 :     start_timer();
1377 :     image_setedges(&dec->refn[1], dec->edged_width, dec->edged_height,
1378 :     dec->width, dec->height, dec->bs_version);
1379 :     dec->is_edged[1] = 1;
1380 :     stop_edges_timer();
1381 :     }
1382 : edgomez 1451
1383 : Skal 1772 resync_len = get_resync_len_b(fcode_backward, fcode_forward);
1384 : suxen_drol 1632 for (y = 0; y < dec->mb_height; y++) {
1385 :     /* Initialize Pred Motion Vector */
1386 :     dec->p_fmv = dec->p_bmv = zeromv;
1387 :     for (x = 0; x < dec->mb_width; x++) {
1388 :     MACROBLOCK *mb = &dec->mbs[y * dec->mb_width + x];
1389 :     MACROBLOCK *last_mb = &dec->last_mbs[y * dec->mb_width + x];
1390 : suxen_drol 1639 int intra_dc_threshold; /* fake variable */
1391 : edgomez 851
1392 : suxen_drol 1632 mv =
1393 :     mb->b_mvs[0] = mb->b_mvs[1] = mb->b_mvs[2] = mb->b_mvs[3] =
1394 :     mb->mvs[0] = mb->mvs[1] = mb->mvs[2] = mb->mvs[3] = zeromv;
1395 :     mb->quant = quant;
1396 : edgomez 851
1397 : suxen_drol 1632 /*
1398 :     * skip if the co-located P_VOP macroblock is not coded
1399 :     * if not codec in co-located S_VOP macroblock is _not_
1400 :     * automatically skipped
1401 :     */
1402 : edgomez 851
1403 : suxen_drol 1632 if (last_mb->mode == MODE_NOT_CODED) {
1404 :     mb->cbp = 0;
1405 :     mb->mode = MODE_FORWARD;
1406 : Isibaar 1669 decoder_mbinter(dec, mb, x, y, mb->cbp, bs, 0, 1, 1);
1407 : suxen_drol 1632 continue;
1408 :     }
1409 : edgomez 851
1410 : Isibaar 1921 if (check_resync_marker(bs, resync_len)) {
1411 :     int bound = read_video_packet_header(bs, dec, resync_len, &quant,
1412 :     &fcode_forward, &fcode_backward, &intra_dc_threshold);
1413 :    
1414 : Isibaar 1928 bound = MAX(0, bound-1); /* valid bound must always be >0 */
1415 : Isibaar 1921 x = bound % dec->mb_width;
1416 :     y = MIN((bound / dec->mb_width), (dec->mb_height-1));
1417 :     /* reset predicted macroblocks */
1418 :     dec->p_fmv = dec->p_bmv = zeromv;
1419 :     /* update resync len with new fcodes */
1420 :     resync_len = get_resync_len_b(fcode_backward, fcode_forward);
1421 :     continue; /* re-init loop */
1422 :     }
1423 :    
1424 : suxen_drol 1632 if (!BitstreamGetBit(bs)) { /* modb=='0' */
1425 :     const uint8_t modb2 = BitstreamGetBit(bs);
1426 : edgomez 851
1427 : suxen_drol 1632 mb->mode = get_mbtype(bs);
1428 : edgomez 851
1429 : suxen_drol 1632 if (!modb2) /* modb=='00' */
1430 :     mb->cbp = BitstreamGetBits(bs, 6);
1431 :     else
1432 :     mb->cbp = 0;
1433 : edgomez 851
1434 : suxen_drol 1632 if (mb->mode && mb->cbp) {
1435 :     quant += get_dbquant(bs);
1436 :     if (quant > 31)
1437 :     quant = 31;
1438 :     else if (quant < 1)
1439 :     quant = 1;
1440 :     }
1441 :     mb->quant = quant;
1442 : edgomez 1382
1443 : suxen_drol 1632 if (dec->interlacing) {
1444 :     if (mb->cbp) {
1445 :     mb->field_dct = BitstreamGetBit(bs);
1446 :     DPRINTF(XVID_DEBUG_MB,"decp: field_dct: %i\n", mb->field_dct);
1447 :     }
1448 : edgomez 1382
1449 : suxen_drol 1632 if (mb->mode) {
1450 :     mb->field_pred = BitstreamGetBit(bs);
1451 :     DPRINTF(XVID_DEBUG_MB, "decp: field_pred: %i\n", mb->field_pred);
1452 : edgomez 1382
1453 : suxen_drol 1632 if (mb->field_pred) {
1454 :     mb->field_for_top = BitstreamGetBit(bs);
1455 :     DPRINTF(XVID_DEBUG_MB,"decp: field_for_top: %i\n", mb->field_for_top);
1456 :     mb->field_for_bot = BitstreamGetBit(bs);
1457 :     DPRINTF(XVID_DEBUG_MB,"decp: field_for_bot: %i\n", mb->field_for_bot);
1458 :     }
1459 :     }
1460 :     }
1461 : edgomez 1382
1462 : suxen_drol 1632 } else {
1463 :     mb->mode = MODE_DIRECT_NONE_MV;
1464 :     mb->cbp = 0;
1465 :     }
1466 : edgomez 851
1467 : suxen_drol 1632 switch (mb->mode) {
1468 :     case MODE_DIRECT:
1469 :     get_b_motion_vector(bs, &mv, 1, zeromv, dec, x, y);
1470 : edgomez 851
1471 : suxen_drol 1632 case MODE_DIRECT_NONE_MV:
1472 :     for (i = 0; i < 4; i++) {
1473 :     mb->mvs[i].x = last_mb->mvs[i].x*dec->time_bp/dec->time_pp + mv.x;
1474 :     mb->mvs[i].y = last_mb->mvs[i].y*dec->time_bp/dec->time_pp + mv.y;
1475 : edgomez 1382
1476 : suxen_drol 1632 mb->b_mvs[i].x = (mv.x)
1477 :     ? mb->mvs[i].x - last_mb->mvs[i].x
1478 :     : last_mb->mvs[i].x*(dec->time_bp - dec->time_pp)/dec->time_pp;
1479 :     mb->b_mvs[i].y = (mv.y)
1480 :     ? mb->mvs[i].y - last_mb->mvs[i].y
1481 :     : last_mb->mvs[i].y*(dec->time_bp - dec->time_pp)/dec->time_pp;
1482 :     }
1483 : edgomez 851
1484 : suxen_drol 1632 decoder_bf_interpolate_mbinter(dec, dec->refn[1], dec->refn[0],
1485 :     mb, x, y, bs, 1);
1486 :     break;
1487 : edgomez 851
1488 : suxen_drol 1632 case MODE_INTERPOLATE:
1489 :     get_b_motion_vector(bs, &mb->mvs[0], fcode_forward, dec->p_fmv, dec, x, y);
1490 :     dec->p_fmv = mb->mvs[1] = mb->mvs[2] = mb->mvs[3] = mb->mvs[0];
1491 : edgomez 851
1492 : suxen_drol 1632 get_b_motion_vector(bs, &mb->b_mvs[0], fcode_backward, dec->p_bmv, dec, x, y);
1493 :     dec->p_bmv = mb->b_mvs[1] = mb->b_mvs[2] = mb->b_mvs[3] = mb->b_mvs[0];
1494 : edgomez 851
1495 : suxen_drol 1632 decoder_bf_interpolate_mbinter(dec, dec->refn[1], dec->refn[0],
1496 :     mb, x, y, bs, 0);
1497 :     break;
1498 : edgomez 851
1499 : suxen_drol 1632 case MODE_BACKWARD:
1500 :     get_b_motion_vector(bs, &mb->mvs[0], fcode_backward, dec->p_bmv, dec, x, y);
1501 :     dec->p_bmv = mb->mvs[1] = mb->mvs[2] = mb->mvs[3] = mb->mvs[0];
1502 : edgomez 851
1503 : Isibaar 1669 decoder_mbinter(dec, mb, x, y, mb->cbp, bs, 0, 0, 1);
1504 : suxen_drol 1632 break;
1505 : edgomez 851
1506 : suxen_drol 1632 case MODE_FORWARD:
1507 :     get_b_motion_vector(bs, &mb->mvs[0], fcode_forward, dec->p_fmv, dec, x, y);
1508 :     dec->p_fmv = mb->mvs[1] = mb->mvs[2] = mb->mvs[3] = mb->mvs[0];
1509 : edgomez 851
1510 : Isibaar 1669 decoder_mbinter(dec, mb, x, y, mb->cbp, bs, 0, 1, 1);
1511 : suxen_drol 1632 break;
1512 :    
1513 :     default:
1514 :     DPRINTF(XVID_DEBUG_ERROR,"Not supported B-frame mb_type = %i\n", mb->mode);
1515 :     }
1516 :     } /* End of for */
1517 :     }
1518 : edgomez 851 }
1519 :    
1520 :     /* perform post processing if necessary, and output the image */
1521 : suxen_drol 1653 static void decoder_output(DECODER * dec, IMAGE * img, MACROBLOCK * mbs,
1522 : suxen_drol 1632 xvid_dec_frame_t * frame, xvid_dec_stats_t * stats,
1523 :     int coding_type, int quant)
1524 : edgomez 851 {
1525 : suxen_drol 1632 const int brightness = XVID_VERSION_MINOR(frame->version) >= 1 ? frame->brightness : 0;
1526 : suxen_drol 1431
1527 : suxen_drol 1632 if (dec->cartoon_mode)
1528 :     frame->general &= ~XVID_FILMEFFECT;
1529 : edgomez 851
1530 : suxen_drol 1632 if ((frame->general & (XVID_DEBLOCKY|XVID_DEBLOCKUV|XVID_FILMEFFECT) || brightness!=0)
1531 :     && mbs != NULL) /* post process */
1532 :     {
1533 :     /* note: image is stored to tmp */
1534 :     image_copy(&dec->tmp, img, dec->edged_width, dec->height);
1535 :     image_postproc(&dec->postproc, &dec->tmp, dec->edged_width,
1536 :     mbs, dec->mb_width, dec->mb_height, dec->mb_width,
1537 : Isibaar 1911 frame->general, brightness, dec->frames, (coding_type == B_VOP), dec->num_threads);
1538 : suxen_drol 1632 img = &dec->tmp;
1539 :     }
1540 : edgomez 851
1541 : Isibaar 2197 if ((frame->output.csp == XVID_CSP_INTERNAL) ||
1542 :     ((frame->output.plane[0] != NULL) && (frame->output.stride[0] >= dec->width))) {
1543 : Isibaar 2177 image_output(img, dec->width, dec->height,
1544 :     dec->edged_width, (uint8_t**)frame->output.plane, frame->output.stride,
1545 :     frame->output.csp, dec->interlacing);
1546 :     }
1547 : edgomez 1382
1548 : suxen_drol 1632 if (stats) {
1549 :     stats->type = coding2type(coding_type);
1550 :     stats->data.vop.time_base = (int)dec->time_base;
1551 :     stats->data.vop.time_increment = 0; /* XXX: todo */
1552 :     stats->data.vop.qscale_stride = dec->mb_width;
1553 :     stats->data.vop.qscale = dec->qscale;
1554 :     if (stats->data.vop.qscale != NULL && mbs != NULL) {
1555 :     unsigned int i;
1556 :     for (i = 0; i < dec->mb_width*dec->mb_height; i++)
1557 :     stats->data.vop.qscale[i] = mbs[i].quant;
1558 :     } else
1559 :     stats->data.vop.qscale = NULL;
1560 :     }
1561 : edgomez 851 }
1562 :    
1563 : edgomez 195 int
1564 :     decoder_decode(DECODER * dec,
1565 : suxen_drol 1632 xvid_dec_frame_t * frame, xvid_dec_stats_t * stats)
1566 : Isibaar 3 {
1567 : edgomez 78
1568 : suxen_drol 1632 Bitstream bs;
1569 : Isibaar 2177 uint32_t rounding = 0;
1570 : suxen_drol 1632 uint32_t quant = 2;
1571 : Isibaar 2177 uint32_t fcode_forward = 0;
1572 :     uint32_t fcode_backward = 0;
1573 :     uint32_t intra_dc_threshold = 0;
1574 : suxen_drol 1632 WARPPOINTS gmc_warp;
1575 : Isibaar 2177 int coding_type = -1;
1576 : suxen_drol 1632 int success, output, seen_something;
1577 : Isibaar 3
1578 : suxen_drol 1632 if (XVID_VERSION_MAJOR(frame->version) != 1 || (stats && XVID_VERSION_MAJOR(stats->version) != 1)) /* v1.x.x */
1579 :     return XVID_ERR_VERSION;
1580 : edgomez 1382
1581 : suxen_drol 1632 start_global_timer();
1582 : Isibaar 2177 memset((void *)&gmc_warp, 0, sizeof(WARPPOINTS));
1583 : edgomez 195
1584 : suxen_drol 1632 dec->low_delay_default = (frame->general & XVID_LOWDELAY);
1585 :     if ((frame->general & XVID_DISCONTINUITY))
1586 :     dec->frames = 0;
1587 :     dec->out_frm = (frame->output.csp == XVID_CSP_SLICE) ? &frame->output : NULL;
1588 : edgomez 851
1589 : suxen_drol 1632 if(frame->length<0) { /* decoder flush */
1590 :     int ret;
1591 :     /* if not decoding "low_delay/packed", and this isn't low_delay and
1592 :     we have a reference frame, then outout the reference frame */
1593 :     if (!(dec->low_delay_default && dec->packed_mode) && !dec->low_delay && dec->frames>0) {
1594 :     decoder_output(dec, &dec->refn[0], dec->last_mbs, frame, stats, dec->last_coding_type, quant);
1595 :     dec->frames = 0;
1596 :     ret = 0;
1597 :     } else {
1598 :     if (stats) stats->type = XVID_TYPE_NOTHING;
1599 :     ret = XVID_ERR_END;
1600 :     }
1601 : edgomez 851
1602 : suxen_drol 1632 emms();
1603 :     stop_global_timer();
1604 :     return ret;
1605 :     }
1606 : edgomez 851
1607 : suxen_drol 1632 BitstreamInit(&bs, frame->bitstream, frame->length);
1608 : Isibaar 3
1609 : suxen_drol 1632 /* XXX: 0x7f is only valid whilst decoding vfw xvid/divx5 avi's */
1610 :     if(dec->low_delay_default && frame->length == 1 && BitstreamShowBits(&bs, 8) == 0x7f)
1611 :     {
1612 :     image_output(&dec->refn[0], dec->width, dec->height, dec->edged_width,
1613 :     (uint8_t**)frame->output.plane, frame->output.stride, frame->output.csp, dec->interlacing);
1614 :     if (stats) stats->type = XVID_TYPE_NOTHING;
1615 :     emms();
1616 :     return 1; /* one byte consumed */
1617 :     }
1618 : Isibaar 179
1619 : suxen_drol 1632 success = 0;
1620 :     output = 0;
1621 :     seen_something = 0;
1622 : edgomez 1382
1623 : edgomez 851 repeat:
1624 : edgomez 195
1625 : suxen_drol 1632 coding_type = BitstreamReadHeaders(&bs, dec, &rounding,
1626 :     &quant, &fcode_forward, &fcode_backward, &intra_dc_threshold, &gmc_warp);
1627 : Isibaar 3
1628 : suxen_drol 1632 DPRINTF(XVID_DEBUG_HEADER, "coding_type=%i, packed=%i, time=%"
1629 : suxen_drol 1607 #if defined(_MSC_VER)
1630 :     "I64"
1631 :     #else
1632 :     "ll"
1633 :     #endif
1634 :     "i, time_pp=%i, time_bp=%i\n",
1635 : suxen_drol 1632 coding_type, dec->packed_mode, dec->time, dec->time_pp, dec->time_bp);
1636 : Isibaar 3
1637 : suxen_drol 1632 if (coding_type == -1) { /* nothing */
1638 :     if (success) goto done;
1639 :     if (stats) stats->type = XVID_TYPE_NOTHING;
1640 :     emms();
1641 :     return BitstreamPos(&bs)/8;
1642 :     }
1643 : Isibaar 3
1644 : suxen_drol 1632 if (coding_type == -2 || coding_type == -3) { /* vol and/or resize */
1645 : edgomez 1382
1646 : suxen_drol 1632 if (coding_type == -3)
1647 : Isibaar 1727 if (decoder_resize(dec)) return XVID_ERR_MEMORY;
1648 : edgomez 1382
1649 : suxen_drol 1632 if(stats) {
1650 :     stats->type = XVID_TYPE_VOL;
1651 :     stats->data.vol.general = 0;
1652 : Isibaar 2132 stats->data.vop.general = 0;
1653 :     if (dec->interlacing) {
1654 :     stats->data.vol.general |= XVID_VOL_INTERLACING;
1655 :     if (dec->top_field_first) {
1656 :     stats->data.vop.general |= XVID_VOP_TOPFIELDFIRST;
1657 :     }
1658 :     }
1659 : suxen_drol 1632 stats->data.vol.width = dec->width;
1660 :     stats->data.vol.height = dec->height;
1661 :     stats->data.vol.par = dec->aspect_ratio;
1662 :     stats->data.vol.par_width = dec->par_width;
1663 :     stats->data.vol.par_height = dec->par_height;
1664 :     emms();
1665 :     return BitstreamPos(&bs)/8; /* number of bytes consumed */
1666 :     }
1667 :     goto repeat;
1668 :     }
1669 : Isibaar 3
1670 : Isibaar 2178 if((dec->frames == 0 && coding_type != I_VOP) || (!dec->width || !dec->height)) {
1671 : suxen_drol 1632 /* 1st frame is not an i-vop */
1672 :     goto repeat;
1673 :     }
1674 : syskin 1439
1675 : Isibaar 1905 dec->p_bmv.x = dec->p_bmv.y = dec->p_fmv.x = dec->p_fmv.y = 0; /* init pred vector to 0 */
1676 : chenm001 290
1677 : suxen_drol 1632 /* packed_mode: special-N_VOP treament */
1678 :     if (dec->packed_mode && coding_type == N_VOP) {
1679 :     if (dec->low_delay_default && dec->frames > 0) {
1680 :     decoder_output(dec, &dec->refn[0], dec->last_mbs, frame, stats, dec->last_coding_type, quant);
1681 :     output = 1;
1682 :     }
1683 :     /* ignore otherwise */
1684 :     } else if (coding_type != B_VOP) {
1685 :     switch(coding_type) {
1686 :     case I_VOP :
1687 :     decoder_iframe(dec, &bs, quant, intra_dc_threshold);
1688 :     break;
1689 :     case P_VOP :
1690 :     decoder_pframe(dec, &bs, rounding, quant,
1691 :     fcode_forward, intra_dc_threshold, NULL);
1692 :     break;
1693 :     case S_VOP :
1694 :     decoder_pframe(dec, &bs, rounding, quant,
1695 :     fcode_forward, intra_dc_threshold, &gmc_warp);
1696 :     break;
1697 :     case N_VOP :
1698 :     /* XXX: not_coded vops are not used for forward prediction */
1699 :     /* we should not swap(last_mbs,mbs) */
1700 :     image_copy(&dec->cur, &dec->refn[0], dec->edged_width, dec->height);
1701 :     SWAP(MACROBLOCK *, dec->mbs, dec->last_mbs); /* it will be swapped back */
1702 :     break;
1703 :     }
1704 : edgomez 851
1705 : suxen_drol 1632 /* note: for packed_mode, output is performed when the special-N_VOP is decoded */
1706 :     if (!(dec->low_delay_default && dec->packed_mode)) {
1707 :     if(dec->low_delay) {
1708 :     decoder_output(dec, &dec->cur, dec->mbs, frame, stats, coding_type, quant);
1709 :     output = 1;
1710 :     } else if (dec->frames > 0) { /* is the reference frame valid? */
1711 :     /* output the reference frame */
1712 :     decoder_output(dec, &dec->refn[0], dec->last_mbs, frame, stats, dec->last_coding_type, quant);
1713 :     output = 1;
1714 :     }
1715 :     }
1716 :    
1717 :     image_swap(&dec->refn[0], &dec->refn[1]);
1718 :     dec->is_edged[1] = dec->is_edged[0];
1719 :     image_swap(&dec->cur, &dec->refn[0]);
1720 :     dec->is_edged[0] = 0;
1721 :     SWAP(MACROBLOCK *, dec->mbs, dec->last_mbs);
1722 :     dec->last_coding_type = coding_type;
1723 : edgomez 851
1724 : suxen_drol 1632 dec->frames++;
1725 :     seen_something = 1;
1726 : chenm001 306
1727 : suxen_drol 1632 } else { /* B_VOP */
1728 : edgomez 851
1729 : suxen_drol 1632 if (dec->low_delay) {
1730 :     DPRINTF(XVID_DEBUG_ERROR, "warning: bvop found in low_delay==1 stream\n");
1731 :     dec->low_delay = 0;
1732 :     }
1733 : edgomez 851
1734 : suxen_drol 1632 if (dec->frames < 2) {
1735 :     /* attemping to decode a bvop without atleast 2 reference frames */
1736 :     image_printf(&dec->cur, dec->edged_width, dec->height, 16, 16,
1737 :     "broken b-frame, mising ref frames");
1738 :     if (stats) stats->type = XVID_TYPE_NOTHING;
1739 :     } else if (dec->time_pp <= dec->time_bp) {
1740 :     /* this occurs when dx50_bvop_compatibility==0 sequences are
1741 :     decoded in vfw. */
1742 :     image_printf(&dec->cur, dec->edged_width, dec->height, 16, 16,
1743 :     "broken b-frame, tpp=%i tbp=%i", dec->time_pp, dec->time_bp);
1744 :     if (stats) stats->type = XVID_TYPE_NOTHING;
1745 :     } else {
1746 :     decoder_bframe(dec, &bs, quant, fcode_forward, fcode_backward);
1747 :     decoder_output(dec, &dec->cur, dec->mbs, frame, stats, coding_type, quant);
1748 :     }
1749 : edgomez 851
1750 : suxen_drol 1632 output = 1;
1751 :     dec->frames++;
1752 :     }
1753 : edgomez 851
1754 : edgomez 1382 #if 0 /* Avoids to read to much data because of 32bit reads in our BS functions */
1755 : suxen_drol 1632 BitstreamByteAlign(&bs);
1756 : edgomez 1382 #endif
1757 : edgomez 851
1758 : suxen_drol 1632 /* low_delay_default mode: repeat in packed_mode */
1759 :     if (dec->low_delay_default && dec->packed_mode && output == 0 && success == 0) {
1760 :     success = 1;
1761 :     goto repeat;
1762 :     }
1763 : edgomez 851
1764 :     done :
1765 :    
1766 : suxen_drol 1607 /* if we reach here without outputing anything _and_
1767 :     the calling application has specified low_delay_default,
1768 :     we *must* output something.
1769 :     this always occurs on the first call to decode() call
1770 :     when bframes are present in the bitstream. it may also
1771 :     occur if no vops were seen in the bitstream
1772 :    
1773 :     if packed_mode is enabled, then we output the recently
1774 :     decoded frame (the very first ivop). otherwise we have
1775 :     nothing to display, and therefore output a black screen.
1776 :     */
1777 :     if (dec->low_delay_default && output == 0) {
1778 :     if (dec->packed_mode && seen_something) {
1779 : suxen_drol 1632 decoder_output(dec, &dec->refn[0], dec->last_mbs, frame, stats, dec->last_coding_type, quant);
1780 : suxen_drol 1607 } else {
1781 : suxen_drol 1632 image_clear(&dec->cur, dec->width, dec->height, dec->edged_width, 0, 128, 128);
1782 :     decoder_output(dec, &dec->cur, NULL, frame, stats, P_VOP, quant);
1783 :     if (stats) stats->type = XVID_TYPE_NOTHING;
1784 :     }
1785 :     }
1786 : edgomez 851
1787 : suxen_drol 1632 emms();
1788 :     stop_global_timer();
1789 : Isibaar 3
1790 : suxen_drol 1632 return (BitstreamPos(&bs)+7)/8; /* number of bytes consumed */
1791 : Isibaar 3 }

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