h264: fix clang warning about uninitialized variable
[libav.git] / libavcodec / h264_refs.c
1 /*
2 * H.26L/H.264/AVC/JVT/14496-10/... reference picture handling
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * H.264 / AVC / MPEG4 part10 reference picture handling.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #include "internal.h"
29 #include "avcodec.h"
30 #include "h264.h"
31 #include "golomb.h"
32
33 #include <assert.h>
34
35 #define COPY_PICTURE(dst, src) \
36 do {\
37 *(dst) = *(src);\
38 (dst)->f.extended_data = (dst)->f.data;\
39 (dst)->tf.f = &(dst)->f;\
40 } while (0)
41
42
43 static void pic_as_field(Picture *pic, const int parity){
44 int i;
45 for (i = 0; i < 4; ++i) {
46 if (parity == PICT_BOTTOM_FIELD)
47 pic->f.data[i] += pic->f.linesize[i];
48 pic->reference = parity;
49 pic->f.linesize[i] *= 2;
50 }
51 pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
52 }
53
54 static int split_field_copy(Picture *dest, Picture *src, int parity, int id_add)
55 {
56 int match = !!(src->reference & parity);
57
58 if (match) {
59 COPY_PICTURE(dest, src);
60 if (parity != PICT_FRAME) {
61 pic_as_field(dest, parity);
62 dest->pic_id *= 2;
63 dest->pic_id += id_add;
64 }
65 }
66
67 return match;
68 }
69
70 static int build_def_list(Picture *def, int def_len,
71 Picture **in, int len, int is_long, int sel)
72 {
73 int i[2] = { 0 };
74 int index = 0;
75
76 while ((i[0] < len || i[1] < len) && index < def_len) {
77 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
78 i[0]++;
79 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
80 i[1]++;
81 if (i[0] < len && index < def_len) {
82 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
83 split_field_copy(&def[index++], in[i[0]++], sel, 1);
84 }
85 if (i[1] < len && index < def_len) {
86 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
87 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
88 }
89 }
90
91 return index;
92 }
93
94 static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir)
95 {
96 int i, best_poc;
97 int out_i = 0;
98
99 for (;;) {
100 best_poc = dir ? INT_MIN : INT_MAX;
101
102 for (i = 0; i < len; i++) {
103 const int poc = src[i]->poc;
104 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
105 best_poc = poc;
106 sorted[out_i] = src[i];
107 }
108 }
109 if (best_poc == (dir ? INT_MIN : INT_MAX))
110 break;
111 limit = sorted[out_i++]->poc - dir;
112 }
113 return out_i;
114 }
115
116 int ff_h264_fill_default_ref_list(H264Context *h)
117 {
118 int i, len;
119
120 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
121 Picture *sorted[32];
122 int cur_poc, list;
123 int lens[2];
124
125 if (FIELD_PICTURE(h))
126 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
127 else
128 cur_poc = h->cur_pic_ptr->poc;
129
130 for (list = 0; list < 2; list++) {
131 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
132 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
133 assert(len <= 32);
134
135 len = build_def_list(h->default_ref_list[list], FF_ARRAY_ELEMS(h->default_ref_list[0]),
136 sorted, len, 0, h->picture_structure);
137 len += build_def_list(h->default_ref_list[list] + len,
138 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
139 h->long_ref, 16, 1, h->picture_structure);
140
141 if (len < h->ref_count[list])
142 memset(&h->default_ref_list[list][len], 0, sizeof(Picture) * (h->ref_count[list] - len));
143 lens[list] = len;
144 }
145
146 if (lens[0] == lens[1] && lens[1] > 1) {
147 for (i = 0; i < lens[0] &&
148 h->default_ref_list[0][i].f.buf[0]->buffer ==
149 h->default_ref_list[1][i].f.buf[0]->buffer; i++);
150 if (i == lens[0]) {
151 Picture tmp;
152 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]);
153 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]);
154 COPY_PICTURE(&h->default_ref_list[1][1], &tmp);
155 }
156 }
157 } else {
158 len = build_def_list(h->default_ref_list[0], FF_ARRAY_ELEMS(h->default_ref_list[0]),
159 h->short_ref, h->short_ref_count, 0, h->picture_structure);
160 len += build_def_list(h->default_ref_list[0] + len,
161 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
162 h-> long_ref, 16, 1, h->picture_structure);
163
164 if (len < h->ref_count[0])
165 memset(&h->default_ref_list[0][len], 0, sizeof(Picture) * (h->ref_count[0] - len));
166 }
167 #ifdef TRACE
168 for (i = 0; i < h->ref_count[0]; i++) {
169 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n",
170 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
171 h->default_ref_list[0][i].pic_id,
172 h->default_ref_list[0][i].f.data[0]);
173 }
174 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
175 for (i = 0; i < h->ref_count[1]; i++) {
176 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n",
177 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
178 h->default_ref_list[1][i].pic_id,
179 h->default_ref_list[1][i].f.data[0]);
180 }
181 }
182 #endif
183 return 0;
184 }
185
186 static void print_short_term(H264Context *h);
187 static void print_long_term(H264Context *h);
188
189 /**
190 * Extract structure information about the picture described by pic_num in
191 * the current decoding context (frame or field). Note that pic_num is
192 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
193 * @param pic_num picture number for which to extract structure information
194 * @param structure one of PICT_XXX describing structure of picture
195 * with pic_num
196 * @return frame number (short term) or long term index of picture
197 * described by pic_num
198 */
199 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
200 {
201 *structure = h->picture_structure;
202 if (FIELD_PICTURE(h)) {
203 if (!(pic_num & 1))
204 /* opposite field */
205 *structure ^= PICT_FRAME;
206 pic_num >>= 1;
207 }
208
209 return pic_num;
210 }
211
212 int ff_h264_decode_ref_pic_list_reordering(H264Context *h)
213 {
214 int list, index, pic_structure, i;
215
216 print_short_term(h);
217 print_long_term(h);
218
219 for (list = 0; list < h->list_count; list++) {
220 for (i = 0; i < h->ref_count[list]; i++)
221 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]);
222
223 if (get_bits1(&h->gb)) { // ref_pic_list_modification_flag_l[01]
224 int pred = h->curr_pic_num;
225
226 for (index = 0; ; index++) {
227 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
228 unsigned int pic_id;
229 int i;
230 Picture *ref = NULL;
231
232 if (modification_of_pic_nums_idc == 3)
233 break;
234
235 if (index >= h->ref_count[list]) {
236 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
237 return -1;
238 }
239
240 switch (modification_of_pic_nums_idc) {
241 case 0:
242 case 1: {
243 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1;
244 int frame_num;
245
246 if (abs_diff_pic_num > h->max_pic_num) {
247 av_log(h->avctx, AV_LOG_ERROR,
248 "abs_diff_pic_num overflow\n");
249 return AVERROR_INVALIDDATA;
250 }
251
252 if (modification_of_pic_nums_idc == 0)
253 pred -= abs_diff_pic_num;
254 else
255 pred += abs_diff_pic_num;
256 pred &= h->max_pic_num - 1;
257
258 frame_num = pic_num_extract(h, pred, &pic_structure);
259
260 for (i = h->short_ref_count - 1; i >= 0; i--) {
261 ref = h->short_ref[i];
262 assert(ref->reference);
263 assert(!ref->long_ref);
264 if (ref->frame_num == frame_num &&
265 (ref->reference & pic_structure))
266 break;
267 }
268 if (i >= 0)
269 ref->pic_id = pred;
270 break;
271 }
272 case 2: {
273 int long_idx;
274 pic_id = get_ue_golomb(&h->gb); // long_term_pic_idx
275
276 long_idx = pic_num_extract(h, pic_id, &pic_structure);
277
278 if (long_idx > 31) {
279 av_log(h->avctx, AV_LOG_ERROR,
280 "long_term_pic_idx overflow\n");
281 return AVERROR_INVALIDDATA;
282 }
283 ref = h->long_ref[long_idx];
284 assert(!(ref && !ref->reference));
285 if (ref && (ref->reference & pic_structure)) {
286 ref->pic_id = pic_id;
287 assert(ref->long_ref);
288 i = 0;
289 } else {
290 i = -1;
291 }
292 break;
293 }
294 default:
295 av_log(h->avctx, AV_LOG_ERROR,
296 "illegal modification_of_pic_nums_idc %u\n",
297 modification_of_pic_nums_idc);
298 return AVERROR_INVALIDDATA;
299 }
300
301 if (i < 0) {
302 av_log(h->avctx, AV_LOG_ERROR,
303 "reference picture missing during reorder\n");
304 memset(&h->ref_list[list][index], 0, sizeof(Picture)); // FIXME
305 } else {
306 for (i = index; i + 1 < h->ref_count[list]; i++) {
307 if (ref->long_ref == h->ref_list[list][i].long_ref &&
308 ref->pic_id == h->ref_list[list][i].pic_id)
309 break;
310 }
311 for (; i > index; i--) {
312 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]);
313 }
314 COPY_PICTURE(&h->ref_list[list][index], ref);
315 if (FIELD_PICTURE(h)) {
316 pic_as_field(&h->ref_list[list][index], pic_structure);
317 }
318 }
319 }
320 }
321 }
322 for (list = 0; list < h->list_count; list++) {
323 for (index = 0; index < h->ref_count[list]; index++) {
324 if (!h->ref_list[list][index].f.buf[0]) {
325 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
326 if (h->default_ref_list[list][0].f.buf[0])
327 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]);
328 else
329 return -1;
330 }
331 }
332 }
333
334 return 0;
335 }
336
337 void ff_h264_fill_mbaff_ref_list(H264Context *h)
338 {
339 int list, i, j;
340 for (list = 0; list < 2; list++) { //FIXME try list_count
341 for (i = 0; i < h->ref_count[list]; i++) {
342 Picture *frame = &h->ref_list[list][i];
343 Picture *field = &h->ref_list[list][16 + 2 * i];
344 COPY_PICTURE(field, frame);
345 for (j = 0; j < 3; j++)
346 field[0].f.linesize[j] <<= 1;
347 field[0].reference = PICT_TOP_FIELD;
348 field[0].poc = field[0].field_poc[0];
349 COPY_PICTURE(field + 1, field);
350 for (j = 0; j < 3; j++)
351 field[1].f.data[j] += frame->f.linesize[j];
352 field[1].reference = PICT_BOTTOM_FIELD;
353 field[1].poc = field[1].field_poc[1];
354
355 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0];
356 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1];
357 for (j = 0; j < 2; j++) {
358 h->chroma_weight[16 + 2 * i][list][j][0] = h->chroma_weight[16 + 2 * i + 1][list][j][0] = h->chroma_weight[i][list][j][0];
359 h->chroma_weight[16 + 2 * i][list][j][1] = h->chroma_weight[16 + 2 * i + 1][list][j][1] = h->chroma_weight[i][list][j][1];
360 }
361 }
362 }
363 }
364
365 /**
366 * Mark a picture as no longer needed for reference. The refmask
367 * argument allows unreferencing of individual fields or the whole frame.
368 * If the picture becomes entirely unreferenced, but is being held for
369 * display purposes, it is marked as such.
370 * @param refmask mask of fields to unreference; the mask is bitwise
371 * anded with the reference marking of pic
372 * @return non-zero if pic becomes entirely unreferenced (except possibly
373 * for display purposes) zero if one of the fields remains in
374 * reference
375 */
376 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask)
377 {
378 int i;
379 if (pic->reference &= refmask) {
380 return 0;
381 } else {
382 for(i = 0; h->delayed_pic[i]; i++)
383 if(pic == h->delayed_pic[i]){
384 pic->reference = DELAYED_PIC_REF;
385 break;
386 }
387 return 1;
388 }
389 }
390
391 /**
392 * Find a Picture in the short term reference list by frame number.
393 * @param frame_num frame number to search for
394 * @param idx the index into h->short_ref where returned picture is found
395 * undefined if no picture found.
396 * @return pointer to the found picture, or NULL if no pic with the provided
397 * frame number is found
398 */
399 static Picture *find_short(H264Context *h, int frame_num, int *idx)
400 {
401 int i;
402
403 for (i = 0; i < h->short_ref_count; i++) {
404 Picture *pic = h->short_ref[i];
405 if (h->avctx->debug & FF_DEBUG_MMCO)
406 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
407 if (pic->frame_num == frame_num) {
408 *idx = i;
409 return pic;
410 }
411 }
412 return NULL;
413 }
414
415 /**
416 * Remove a picture from the short term reference list by its index in
417 * that list. This does no checking on the provided index; it is assumed
418 * to be valid. Other list entries are shifted down.
419 * @param i index into h->short_ref of picture to remove.
420 */
421 static void remove_short_at_index(H264Context *h, int i)
422 {
423 assert(i >= 0 && i < h->short_ref_count);
424 h->short_ref[i] = NULL;
425 if (--h->short_ref_count)
426 memmove(&h->short_ref[i], &h->short_ref[i + 1],
427 (h->short_ref_count - i) * sizeof(Picture*));
428 }
429
430 /**
431 *
432 * @return the removed picture or NULL if an error occurs
433 */
434 static Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
435 {
436 Picture *pic;
437 int i;
438
439 if (h->avctx->debug & FF_DEBUG_MMCO)
440 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
441
442 pic = find_short(h, frame_num, &i);
443 if (pic) {
444 if (unreference_pic(h, pic, ref_mask))
445 remove_short_at_index(h, i);
446 }
447
448 return pic;
449 }
450
451 /**
452 * Remove a picture from the long term reference list by its index in
453 * that list.
454 * @return the removed picture or NULL if an error occurs
455 */
456 static Picture *remove_long(H264Context *h, int i, int ref_mask)
457 {
458 Picture *pic;
459
460 pic = h->long_ref[i];
461 if (pic) {
462 if (unreference_pic(h, pic, ref_mask)) {
463 assert(h->long_ref[i]->long_ref == 1);
464 h->long_ref[i]->long_ref = 0;
465 h->long_ref[i] = NULL;
466 h->long_ref_count--;
467 }
468 }
469
470 return pic;
471 }
472
473 void ff_h264_remove_all_refs(H264Context *h)
474 {
475 int i;
476
477 for (i = 0; i < 16; i++) {
478 remove_long(h, i, 0);
479 }
480 assert(h->long_ref_count == 0);
481
482 for (i = 0; i < h->short_ref_count; i++) {
483 unreference_pic(h, h->short_ref[i], 0);
484 h->short_ref[i] = NULL;
485 }
486 h->short_ref_count = 0;
487 }
488
489 /**
490 * print short term list
491 */
492 static void print_short_term(H264Context *h)
493 {
494 uint32_t i;
495 if (h->avctx->debug & FF_DEBUG_MMCO) {
496 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
497 for (i = 0; i < h->short_ref_count; i++) {
498 Picture *pic = h->short_ref[i];
499 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
500 i, pic->frame_num, pic->poc, pic->f.data[0]);
501 }
502 }
503 }
504
505 /**
506 * print long term list
507 */
508 static void print_long_term(H264Context *h)
509 {
510 uint32_t i;
511 if (h->avctx->debug & FF_DEBUG_MMCO) {
512 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
513 for (i = 0; i < 16; i++) {
514 Picture *pic = h->long_ref[i];
515 if (pic) {
516 av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n",
517 i, pic->frame_num, pic->poc, pic->f.data[0]);
518 }
519 }
520 }
521 }
522
523 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
524 {
525 int i;
526
527 for (i = 0; i < n_mmcos; i++) {
528 if (mmco1[i].opcode != mmco2[i].opcode)
529 return -1;
530 }
531
532 return 0;
533 }
534
535 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
536 {
537 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
538 int mmco_index = 0, i = 0;
539
540 assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
541
542 if (h->short_ref_count &&
543 h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
544 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
545 mmco[0].opcode = MMCO_SHORT2UNUSED;
546 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
547 mmco_index = 1;
548 if (FIELD_PICTURE(h)) {
549 mmco[0].short_pic_num *= 2;
550 mmco[1].opcode = MMCO_SHORT2UNUSED;
551 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
552 mmco_index = 2;
553 }
554 }
555
556 if (first_slice) {
557 h->mmco_index = mmco_index;
558 } else if (!first_slice && mmco_index >= 0 &&
559 (mmco_index != h->mmco_index ||
560 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
561 av_log(h->avctx, AV_LOG_ERROR,
562 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
563 mmco_index, h->mmco_index, i);
564 return AVERROR_INVALIDDATA;
565 }
566 return 0;
567 }
568
569 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
570 {
571 int i, av_uninit(j);
572 int current_ref_assigned = 0, err = 0;
573 Picture *av_uninit(pic);
574
575 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
576 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
577
578 for (i = 0; i < mmco_count; i++) {
579 int av_uninit(structure), av_uninit(frame_num);
580 if (h->avctx->debug & FF_DEBUG_MMCO)
581 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
582 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
583
584 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
585 mmco[i].opcode == MMCO_SHORT2LONG) {
586 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
587 pic = find_short(h, frame_num, &j);
588 if (!pic) {
589 if (mmco[i].opcode != MMCO_SHORT2LONG ||
590 !h->long_ref[mmco[i].long_arg] ||
591 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
592 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
593 err = AVERROR_INVALIDDATA;
594 }
595 continue;
596 }
597 }
598
599 switch (mmco[i].opcode) {
600 case MMCO_SHORT2UNUSED:
601 if (h->avctx->debug & FF_DEBUG_MMCO)
602 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
603 h->mmco[i].short_pic_num, h->short_ref_count);
604 remove_short(h, frame_num, structure ^ PICT_FRAME);
605 break;
606 case MMCO_SHORT2LONG:
607 if (h->long_ref[mmco[i].long_arg] != pic)
608 remove_long(h, mmco[i].long_arg, 0);
609
610 remove_short_at_index(h, j);
611 h->long_ref[ mmco[i].long_arg ] = pic;
612 if (h->long_ref[mmco[i].long_arg]) {
613 h->long_ref[mmco[i].long_arg]->long_ref = 1;
614 h->long_ref_count++;
615 }
616 break;
617 case MMCO_LONG2UNUSED:
618 j = pic_num_extract(h, mmco[i].long_arg, &structure);
619 pic = h->long_ref[j];
620 if (pic) {
621 remove_long(h, j, structure ^ PICT_FRAME);
622 } else if (h->avctx->debug & FF_DEBUG_MMCO)
623 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
624 break;
625 case MMCO_LONG:
626 // Comment below left from previous code as it is an interresting note.
627 /* First field in pair is in short term list or
628 * at a different long term index.
629 * This is not allowed; see 7.4.3.3, notes 2 and 3.
630 * Report the problem and keep the pair where it is,
631 * and mark this field valid.
632 */
633 if (h->short_ref[0] == h->cur_pic_ptr)
634 remove_short_at_index(h, 0);
635
636 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
637 remove_long(h, mmco[i].long_arg, 0);
638
639 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
640 h->long_ref[mmco[i].long_arg]->long_ref = 1;
641 h->long_ref_count++;
642 }
643
644 h->cur_pic_ptr->reference |= h->picture_structure;
645 current_ref_assigned = 1;
646 break;
647 case MMCO_SET_MAX_LONG:
648 assert(mmco[i].long_arg <= 16);
649 // just remove the long term which index is greater than new max
650 for (j = mmco[i].long_arg; j < 16; j++) {
651 remove_long(h, j, 0);
652 }
653 break;
654 case MMCO_RESET:
655 while (h->short_ref_count) {
656 remove_short(h, h->short_ref[0]->frame_num, 0);
657 }
658 for (j = 0; j < 16; j++) {
659 remove_long(h, j, 0);
660 }
661 h->frame_num = h->cur_pic_ptr->frame_num = 0;
662 h->mmco_reset = 1;
663 h->cur_pic_ptr->mmco_reset = 1;
664 break;
665 default: assert(0);
666 }
667 }
668
669 if (!current_ref_assigned) {
670 /* Second field of complementary field pair; the first field of
671 * which is already referenced. If short referenced, it
672 * should be first entry in short_ref. If not, it must exist
673 * in long_ref; trying to put it on the short list here is an
674 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
675 */
676 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
677 /* Just mark the second field valid */
678 h->cur_pic_ptr->reference = PICT_FRAME;
679 } else if (h->cur_pic_ptr->long_ref) {
680 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
681 "assignment for second field "
682 "in complementary field pair "
683 "(first field is long term)\n");
684 err = AVERROR_INVALIDDATA;
685 } else {
686 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
687 if (pic) {
688 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
689 err = AVERROR_INVALIDDATA;
690 }
691
692 if (h->short_ref_count)
693 memmove(&h->short_ref[1], &h->short_ref[0],
694 h->short_ref_count * sizeof(Picture*));
695
696 h->short_ref[0] = h->cur_pic_ptr;
697 h->short_ref_count++;
698 h->cur_pic_ptr->reference |= h->picture_structure;
699 }
700 }
701
702 if (h->long_ref_count + h->short_ref_count -
703 (h->short_ref[0] == h->cur_pic_ptr) > h->sps.ref_frame_count) {
704
705 /* We have too many reference frames, probably due to corrupted
706 * stream. Need to discard one frame. Prevents overrun of the
707 * short_ref and long_ref buffers.
708 */
709 av_log(h->avctx, AV_LOG_ERROR,
710 "number of reference frames (%d+%d) exceeds max (%d; probably "
711 "corrupt input), discarding one\n",
712 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
713 err = AVERROR_INVALIDDATA;
714
715 if (h->long_ref_count && !h->short_ref_count) {
716 for (i = 0; i < 16; ++i)
717 if (h->long_ref[i])
718 break;
719
720 assert(i < 16);
721 remove_long(h, i, 0);
722 } else {
723 pic = h->short_ref[h->short_ref_count - 1];
724 remove_short(h, pic->frame_num, 0);
725 }
726 }
727
728 print_short_term(h);
729 print_long_term(h);
730 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
731 }
732
733 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
734 int first_slice)
735 {
736 int i, ret;
737 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
738 int mmco_index = 0;
739
740 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
741 skip_bits1(gb); // broken_link
742 if (get_bits1(gb)) {
743 mmco[0].opcode = MMCO_LONG;
744 mmco[0].long_arg = 0;
745 mmco_index = 1;
746 }
747 } else {
748 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
749 for (i = 0; i < MAX_MMCO_COUNT; i++) {
750 MMCOOpcode opcode = get_ue_golomb_31(gb);
751
752 mmco[i].opcode = opcode;
753 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
754 mmco[i].short_pic_num =
755 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
756 (h->max_pic_num - 1);
757 #if 0
758 if (mmco[i].short_pic_num >= h->short_ref_count ||
759 h->short_ref[ mmco[i].short_pic_num ] == NULL){
760 av_log(s->avctx, AV_LOG_ERROR,
761 "illegal short ref in memory management control "
762 "operation %d\n", mmco);
763 return -1;
764 }
765 #endif
766 }
767 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
768 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
769 unsigned int long_arg = get_ue_golomb_31(gb);
770 if (long_arg >= 32 ||
771 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
772 long_arg == 16) &&
773 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
774 av_log(h->avctx, AV_LOG_ERROR,
775 "illegal long ref in memory management control "
776 "operation %d\n", opcode);
777 return -1;
778 }
779 mmco[i].long_arg = long_arg;
780 }
781
782 if (opcode > (unsigned) MMCO_LONG) {
783 av_log(h->avctx, AV_LOG_ERROR,
784 "illegal memory management control operation %d\n",
785 opcode);
786 return -1;
787 }
788 if (opcode == MMCO_END)
789 break;
790 }
791 mmco_index = i;
792 } else {
793 if (first_slice) {
794 ret = ff_generate_sliding_window_mmcos(h, first_slice);
795 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
796 return ret;
797 }
798 mmco_index = -1;
799 }
800 }
801
802 if (first_slice && mmco_index != -1) {
803 h->mmco_index = mmco_index;
804 } else if (!first_slice && mmco_index >= 0 &&
805 (mmco_index != h->mmco_index ||
806 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
807 av_log(h->avctx, AV_LOG_ERROR,
808 "Inconsistent MMCO state between slices [%d, %d]\n",
809 mmco_index, h->mmco_index);
810 return AVERROR_INVALIDDATA;
811 }
812
813 return 0;
814 }