h264_refs: Remove broken trace debug code
[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 <inttypes.h>
29
30 #include "internal.h"
31 #include "avcodec.h"
32 #include "h264.h"
33 #include "golomb.h"
34 #include "mpegutils.h"
35
36 #include <assert.h>
37
38 static void pic_as_field(H264Ref *pic, const int parity)
39 {
40 int i;
41 for (i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
42 if (parity == PICT_BOTTOM_FIELD)
43 pic->data[i] += pic->linesize[i];
44 pic->reference = parity;
45 pic->linesize[i] *= 2;
46 }
47 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
48 }
49
50 static void ref_from_h264pic(H264Ref *dst, H264Picture *src)
51 {
52 memcpy(dst->data, src->f->data, sizeof(dst->data));
53 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
54 dst->reference = src->reference;
55 dst->poc = src->poc;
56 dst->pic_id = src->pic_id;
57 dst->parent = src;
58 }
59
60 static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add)
61 {
62 int match = !!(src->reference & parity);
63
64 if (match) {
65 ref_from_h264pic(dest, src);
66 if (parity != PICT_FRAME) {
67 pic_as_field(dest, parity);
68 dest->pic_id *= 2;
69 dest->pic_id += id_add;
70 }
71 }
72
73 return match;
74 }
75
76 static int build_def_list(H264Ref *def, int def_len,
77 H264Picture **in, int len, int is_long, int sel)
78 {
79 int i[2] = { 0 };
80 int index = 0;
81
82 while ((i[0] < len || i[1] < len) && index < def_len) {
83 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
84 i[0]++;
85 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
86 i[1]++;
87 if (i[0] < len && index < def_len) {
88 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
89 split_field_copy(&def[index++], in[i[0]++], sel, 1);
90 }
91 if (i[1] < len && index < def_len) {
92 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
93 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
94 }
95 }
96
97 return index;
98 }
99
100 static int add_sorted(H264Picture **sorted, H264Picture **src, int len, int limit, int dir)
101 {
102 int i, best_poc;
103 int out_i = 0;
104
105 for (;;) {
106 best_poc = dir ? INT_MIN : INT_MAX;
107
108 for (i = 0; i < len; i++) {
109 const int poc = src[i]->poc;
110 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
111 best_poc = poc;
112 sorted[out_i] = src[i];
113 }
114 }
115 if (best_poc == (dir ? INT_MIN : INT_MAX))
116 break;
117 limit = sorted[out_i++]->poc - dir;
118 }
119 return out_i;
120 }
121
122 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
123 {
124 int i, len;
125
126 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
127 H264Picture *sorted[32];
128 int cur_poc, list;
129 int lens[2];
130
131 if (FIELD_PICTURE(h))
132 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
133 else
134 cur_poc = h->cur_pic_ptr->poc;
135
136 for (list = 0; list < 2; list++) {
137 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
138 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
139 assert(len <= 32);
140
141 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
142 sorted, len, 0, h->picture_structure);
143 len += build_def_list(sl->ref_list[list] + len,
144 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
145 h->long_ref, 16, 1, h->picture_structure);
146
147 if (len < sl->ref_count[list])
148 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
149 lens[list] = len;
150 }
151
152 if (lens[0] == lens[1] && lens[1] > 1) {
153 for (i = 0; i < lens[0] &&
154 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
155 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
156 if (i == lens[0]) {
157 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
158 }
159 }
160 } else {
161 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
162 h->short_ref, h->short_ref_count, 0, h->picture_structure);
163 len += build_def_list(sl->ref_list[0] + len,
164 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
165 h-> long_ref, 16, 1, h->picture_structure);
166
167 if (len < sl->ref_count[0])
168 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
169 }
170 }
171
172 static void print_short_term(H264Context *h);
173 static void print_long_term(H264Context *h);
174
175 /**
176 * Extract structure information about the picture described by pic_num in
177 * the current decoding context (frame or field). Note that pic_num is
178 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
179 * @param pic_num picture number for which to extract structure information
180 * @param structure one of PICT_XXX describing structure of picture
181 * with pic_num
182 * @return frame number (short term) or long term index of picture
183 * described by pic_num
184 */
185 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
186 {
187 *structure = h->picture_structure;
188 if (FIELD_PICTURE(h)) {
189 if (!(pic_num & 1))
190 /* opposite field */
191 *structure ^= PICT_FRAME;
192 pic_num >>= 1;
193 }
194
195 return pic_num;
196 }
197
198 int ff_h264_decode_ref_pic_list_reordering(H264Context *h, H264SliceContext *sl)
199 {
200 int list, index, pic_structure;
201
202 print_short_term(h);
203 print_long_term(h);
204
205 h264_initialise_ref_list(h, sl);
206
207 for (list = 0; list < sl->list_count; list++) {
208 if (get_bits1(&sl->gb)) { // ref_pic_list_modification_flag_l[01]
209 int pred = h->curr_pic_num;
210
211 for (index = 0; ; index++) {
212 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
213 unsigned int pic_id;
214 int i;
215 H264Picture *ref = NULL;
216
217 if (modification_of_pic_nums_idc == 3)
218 break;
219
220 if (index >= sl->ref_count[list]) {
221 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
222 return -1;
223 }
224
225 switch (modification_of_pic_nums_idc) {
226 case 0:
227 case 1: {
228 const unsigned int abs_diff_pic_num = get_ue_golomb(&sl->gb) + 1;
229 int frame_num;
230
231 if (abs_diff_pic_num > h->max_pic_num) {
232 av_log(h->avctx, AV_LOG_ERROR,
233 "abs_diff_pic_num overflow\n");
234 return AVERROR_INVALIDDATA;
235 }
236
237 if (modification_of_pic_nums_idc == 0)
238 pred -= abs_diff_pic_num;
239 else
240 pred += abs_diff_pic_num;
241 pred &= h->max_pic_num - 1;
242
243 frame_num = pic_num_extract(h, pred, &pic_structure);
244
245 for (i = h->short_ref_count - 1; i >= 0; i--) {
246 ref = h->short_ref[i];
247 assert(ref->reference);
248 assert(!ref->long_ref);
249 if (ref->frame_num == frame_num &&
250 (ref->reference & pic_structure))
251 break;
252 }
253 if (i >= 0)
254 ref->pic_id = pred;
255 break;
256 }
257 case 2: {
258 int long_idx;
259 pic_id = get_ue_golomb(&sl->gb); // long_term_pic_idx
260
261 long_idx = pic_num_extract(h, pic_id, &pic_structure);
262
263 if (long_idx > 31) {
264 av_log(h->avctx, AV_LOG_ERROR,
265 "long_term_pic_idx overflow\n");
266 return AVERROR_INVALIDDATA;
267 }
268 ref = h->long_ref[long_idx];
269 assert(!(ref && !ref->reference));
270 if (ref && (ref->reference & pic_structure)) {
271 ref->pic_id = pic_id;
272 assert(ref->long_ref);
273 i = 0;
274 } else {
275 i = -1;
276 }
277 break;
278 }
279 default:
280 av_log(h->avctx, AV_LOG_ERROR,
281 "illegal modification_of_pic_nums_idc %u\n",
282 modification_of_pic_nums_idc);
283 return AVERROR_INVALIDDATA;
284 }
285
286 if (i < 0) {
287 av_log(h->avctx, AV_LOG_ERROR,
288 "reference picture missing during reorder\n");
289 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
290 } else {
291 for (i = index; i + 1 < sl->ref_count[list]; i++) {
292 if (sl->ref_list[list][i].parent &&
293 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
294 ref->pic_id == sl->ref_list[list][i].pic_id)
295 break;
296 }
297 for (; i > index; i--) {
298 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
299 }
300 ref_from_h264pic(&sl->ref_list[list][index], ref);
301 if (FIELD_PICTURE(h)) {
302 pic_as_field(&sl->ref_list[list][index], pic_structure);
303 }
304 }
305 }
306 }
307 }
308 for (list = 0; list < sl->list_count; list++) {
309 for (index = 0; index < sl->ref_count[list]; index++) {
310 if (!sl->ref_list[list][index].parent) {
311 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
312 if (index == 0 || h->avctx->err_recognition & AV_EF_EXPLODE)
313 return AVERROR_INVALIDDATA;
314 else
315 sl->ref_list[list][index] = sl->ref_list[list][index - 1];
316 }
317 }
318 }
319
320 return 0;
321 }
322
323 void ff_h264_fill_mbaff_ref_list(H264Context *h, H264SliceContext *sl)
324 {
325 int list, i, j;
326 for (list = 0; list < sl->list_count; list++) { //FIXME try list_count
327 for (i = 0; i < sl->ref_count[list]; i++) {
328 H264Ref *frame = &sl->ref_list[list][i];
329 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
330
331 field[0] = *frame;
332
333 for (j = 0; j < 3; j++)
334 field[0].linesize[j] <<= 1;
335 field[0].reference = PICT_TOP_FIELD;
336 field[0].poc = field[0].parent->field_poc[0];
337
338 field[1] = field[0];
339
340 for (j = 0; j < 3; j++)
341 field[1].data[j] += frame->parent->f->linesize[j];
342 field[1].reference = PICT_BOTTOM_FIELD;
343 field[1].poc = field[1].parent->field_poc[1];
344
345 sl->luma_weight[16 + 2 * i][list][0] = sl->luma_weight[16 + 2 * i + 1][list][0] = sl->luma_weight[i][list][0];
346 sl->luma_weight[16 + 2 * i][list][1] = sl->luma_weight[16 + 2 * i + 1][list][1] = sl->luma_weight[i][list][1];
347 for (j = 0; j < 2; j++) {
348 sl->chroma_weight[16 + 2 * i][list][j][0] = sl->chroma_weight[16 + 2 * i + 1][list][j][0] = sl->chroma_weight[i][list][j][0];
349 sl->chroma_weight[16 + 2 * i][list][j][1] = sl->chroma_weight[16 + 2 * i + 1][list][j][1] = sl->chroma_weight[i][list][j][1];
350 }
351 }
352 }
353 }
354
355 /**
356 * Mark a picture as no longer needed for reference. The refmask
357 * argument allows unreferencing of individual fields or the whole frame.
358 * If the picture becomes entirely unreferenced, but is being held for
359 * display purposes, it is marked as such.
360 * @param refmask mask of fields to unreference; the mask is bitwise
361 * anded with the reference marking of pic
362 * @return non-zero if pic becomes entirely unreferenced (except possibly
363 * for display purposes) zero if one of the fields remains in
364 * reference
365 */
366 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
367 {
368 int i;
369 if (pic->reference &= refmask) {
370 return 0;
371 } else {
372 for(i = 0; h->delayed_pic[i]; i++)
373 if(pic == h->delayed_pic[i]){
374 pic->reference = DELAYED_PIC_REF;
375 break;
376 }
377 return 1;
378 }
379 }
380
381 /**
382 * Find a H264Picture in the short term reference list by frame number.
383 * @param frame_num frame number to search for
384 * @param idx the index into h->short_ref where returned picture is found
385 * undefined if no picture found.
386 * @return pointer to the found picture, or NULL if no pic with the provided
387 * frame number is found
388 */
389 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
390 {
391 int i;
392
393 for (i = 0; i < h->short_ref_count; i++) {
394 H264Picture *pic = h->short_ref[i];
395 if (h->avctx->debug & FF_DEBUG_MMCO)
396 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
397 if (pic->frame_num == frame_num) {
398 *idx = i;
399 return pic;
400 }
401 }
402 return NULL;
403 }
404
405 /**
406 * Remove a picture from the short term reference list by its index in
407 * that list. This does no checking on the provided index; it is assumed
408 * to be valid. Other list entries are shifted down.
409 * @param i index into h->short_ref of picture to remove.
410 */
411 static void remove_short_at_index(H264Context *h, int i)
412 {
413 assert(i >= 0 && i < h->short_ref_count);
414 h->short_ref[i] = NULL;
415 if (--h->short_ref_count)
416 memmove(&h->short_ref[i], &h->short_ref[i + 1],
417 (h->short_ref_count - i) * sizeof(H264Picture*));
418 }
419
420 /**
421 *
422 * @return the removed picture or NULL if an error occurs
423 */
424 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
425 {
426 H264Picture *pic;
427 int i;
428
429 if (h->avctx->debug & FF_DEBUG_MMCO)
430 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
431
432 pic = find_short(h, frame_num, &i);
433 if (pic) {
434 if (unreference_pic(h, pic, ref_mask))
435 remove_short_at_index(h, i);
436 }
437
438 return pic;
439 }
440
441 /**
442 * Remove a picture from the long term reference list by its index in
443 * that list.
444 * @return the removed picture or NULL if an error occurs
445 */
446 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
447 {
448 H264Picture *pic;
449
450 pic = h->long_ref[i];
451 if (pic) {
452 if (unreference_pic(h, pic, ref_mask)) {
453 assert(h->long_ref[i]->long_ref == 1);
454 h->long_ref[i]->long_ref = 0;
455 h->long_ref[i] = NULL;
456 h->long_ref_count--;
457 }
458 }
459
460 return pic;
461 }
462
463 void ff_h264_remove_all_refs(H264Context *h)
464 {
465 int i;
466
467 for (i = 0; i < 16; i++) {
468 remove_long(h, i, 0);
469 }
470 assert(h->long_ref_count == 0);
471
472 for (i = 0; i < h->short_ref_count; i++) {
473 unreference_pic(h, h->short_ref[i], 0);
474 h->short_ref[i] = NULL;
475 }
476 h->short_ref_count = 0;
477 }
478
479 /**
480 * print short term list
481 */
482 static void print_short_term(H264Context *h)
483 {
484 uint32_t i;
485 if (h->avctx->debug & FF_DEBUG_MMCO) {
486 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
487 for (i = 0; i < h->short_ref_count; i++) {
488 H264Picture *pic = h->short_ref[i];
489 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
490 i, pic->frame_num, pic->poc, pic->f->data[0]);
491 }
492 }
493 }
494
495 /**
496 * print long term list
497 */
498 static void print_long_term(H264Context *h)
499 {
500 uint32_t i;
501 if (h->avctx->debug & FF_DEBUG_MMCO) {
502 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
503 for (i = 0; i < 16; i++) {
504 H264Picture *pic = h->long_ref[i];
505 if (pic) {
506 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
507 i, pic->frame_num, pic->poc, pic->f->data[0]);
508 }
509 }
510 }
511 }
512
513 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
514 {
515 int i;
516
517 for (i = 0; i < n_mmcos; i++) {
518 if (mmco1[i].opcode != mmco2[i].opcode)
519 return -1;
520 }
521
522 return 0;
523 }
524
525 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
526 {
527 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
528 int mmco_index = 0, i = 0;
529
530 assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
531
532 if (h->short_ref_count &&
533 h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
534 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
535 mmco[0].opcode = MMCO_SHORT2UNUSED;
536 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
537 mmco_index = 1;
538 if (FIELD_PICTURE(h)) {
539 mmco[0].short_pic_num *= 2;
540 mmco[1].opcode = MMCO_SHORT2UNUSED;
541 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
542 mmco_index = 2;
543 }
544 }
545
546 if (first_slice) {
547 h->mmco_index = mmco_index;
548 } else if (!first_slice && mmco_index >= 0 &&
549 (mmco_index != h->mmco_index ||
550 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
551 av_log(h->avctx, AV_LOG_ERROR,
552 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
553 mmco_index, h->mmco_index, i);
554 return AVERROR_INVALIDDATA;
555 }
556 return 0;
557 }
558
559 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
560 {
561 int i, av_uninit(j);
562 int current_ref_assigned = 0, err = 0;
563 H264Picture *av_uninit(pic);
564
565 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
566 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
567
568 for (i = 0; i < mmco_count; i++) {
569 int av_uninit(structure), av_uninit(frame_num);
570 if (h->avctx->debug & FF_DEBUG_MMCO)
571 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
572 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
573
574 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
575 mmco[i].opcode == MMCO_SHORT2LONG) {
576 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
577 pic = find_short(h, frame_num, &j);
578 if (!pic) {
579 if (mmco[i].opcode != MMCO_SHORT2LONG ||
580 !h->long_ref[mmco[i].long_arg] ||
581 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
582 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
583 err = AVERROR_INVALIDDATA;
584 }
585 continue;
586 }
587 }
588
589 switch (mmco[i].opcode) {
590 case MMCO_SHORT2UNUSED:
591 if (h->avctx->debug & FF_DEBUG_MMCO)
592 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
593 h->mmco[i].short_pic_num, h->short_ref_count);
594 remove_short(h, frame_num, structure ^ PICT_FRAME);
595 break;
596 case MMCO_SHORT2LONG:
597 if (h->long_ref[mmco[i].long_arg] != pic)
598 remove_long(h, mmco[i].long_arg, 0);
599
600 remove_short_at_index(h, j);
601 h->long_ref[ mmco[i].long_arg ] = pic;
602 if (h->long_ref[mmco[i].long_arg]) {
603 h->long_ref[mmco[i].long_arg]->long_ref = 1;
604 h->long_ref_count++;
605 }
606 break;
607 case MMCO_LONG2UNUSED:
608 j = pic_num_extract(h, mmco[i].long_arg, &structure);
609 pic = h->long_ref[j];
610 if (pic) {
611 remove_long(h, j, structure ^ PICT_FRAME);
612 } else if (h->avctx->debug & FF_DEBUG_MMCO)
613 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
614 break;
615 case MMCO_LONG:
616 // Comment below left from previous code as it is an interresting note.
617 /* First field in pair is in short term list or
618 * at a different long term index.
619 * This is not allowed; see 7.4.3.3, notes 2 and 3.
620 * Report the problem and keep the pair where it is,
621 * and mark this field valid.
622 */
623 if (h->short_ref[0] == h->cur_pic_ptr)
624 remove_short_at_index(h, 0);
625
626 /* make sure the current picture is not already assigned as a long ref */
627 if (h->cur_pic_ptr->long_ref) {
628 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
629 if (h->long_ref[j] == h->cur_pic_ptr)
630 remove_long(h, j, 0);
631 }
632 }
633
634
635 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
636 remove_long(h, mmco[i].long_arg, 0);
637
638 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
639 h->long_ref[mmco[i].long_arg]->long_ref = 1;
640 h->long_ref_count++;
641 }
642
643 h->cur_pic_ptr->reference |= h->picture_structure;
644 current_ref_assigned = 1;
645 break;
646 case MMCO_SET_MAX_LONG:
647 assert(mmco[i].long_arg <= 16);
648 // just remove the long term which index is greater than new max
649 for (j = mmco[i].long_arg; j < 16; j++) {
650 remove_long(h, j, 0);
651 }
652 break;
653 case MMCO_RESET:
654 while (h->short_ref_count) {
655 remove_short(h, h->short_ref[0]->frame_num, 0);
656 }
657 for (j = 0; j < 16; j++) {
658 remove_long(h, j, 0);
659 }
660 h->frame_num = h->cur_pic_ptr->frame_num = 0;
661 h->mmco_reset = 1;
662 h->cur_pic_ptr->mmco_reset = 1;
663 break;
664 default: assert(0);
665 }
666 }
667
668 if (!current_ref_assigned) {
669 /* Second field of complementary field pair; the first field of
670 * which is already referenced. If short referenced, it
671 * should be first entry in short_ref. If not, it must exist
672 * in long_ref; trying to put it on the short list here is an
673 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
674 */
675 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
676 /* Just mark the second field valid */
677 h->cur_pic_ptr->reference = PICT_FRAME;
678 } else if (h->cur_pic_ptr->long_ref) {
679 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
680 "assignment for second field "
681 "in complementary field pair "
682 "(first field is long term)\n");
683 err = AVERROR_INVALIDDATA;
684 } else {
685 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
686 if (pic) {
687 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
688 err = AVERROR_INVALIDDATA;
689 }
690
691 if (h->short_ref_count)
692 memmove(&h->short_ref[1], &h->short_ref[0],
693 h->short_ref_count * sizeof(H264Picture*));
694
695 h->short_ref[0] = h->cur_pic_ptr;
696 h->short_ref_count++;
697 h->cur_pic_ptr->reference |= h->picture_structure;
698 }
699 }
700
701 if (h->long_ref_count + h->short_ref_count -
702 (h->short_ref[0] == h->cur_pic_ptr) > h->sps.ref_frame_count) {
703
704 /* We have too many reference frames, probably due to corrupted
705 * stream. Need to discard one frame. Prevents overrun of the
706 * short_ref and long_ref buffers.
707 */
708 av_log(h->avctx, AV_LOG_ERROR,
709 "number of reference frames (%d+%d) exceeds max (%d; probably "
710 "corrupt input), discarding one\n",
711 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
712 err = AVERROR_INVALIDDATA;
713
714 if (h->long_ref_count && !h->short_ref_count) {
715 for (i = 0; i < 16; ++i)
716 if (h->long_ref[i])
717 break;
718
719 assert(i < 16);
720 remove_long(h, i, 0);
721 } else {
722 pic = h->short_ref[h->short_ref_count - 1];
723 remove_short(h, pic->frame_num, 0);
724 }
725 }
726
727 print_short_term(h);
728 print_long_term(h);
729 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
730 }
731
732 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
733 int first_slice)
734 {
735 int i, ret;
736 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
737 int mmco_index = 0;
738
739 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
740 skip_bits1(gb); // broken_link
741 if (get_bits1(gb)) {
742 mmco[0].opcode = MMCO_LONG;
743 mmco[0].long_arg = 0;
744 mmco_index = 1;
745 }
746 } else {
747 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
748 for (i = 0; i < MAX_MMCO_COUNT; i++) {
749 MMCOOpcode opcode = get_ue_golomb_31(gb);
750
751 mmco[i].opcode = opcode;
752 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
753 mmco[i].short_pic_num =
754 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
755 (h->max_pic_num - 1);
756 #if 0
757 if (mmco[i].short_pic_num >= h->short_ref_count ||
758 !h->short_ref[mmco[i].short_pic_num]) {
759 av_log(s->avctx, AV_LOG_ERROR,
760 "illegal short ref in memory management control "
761 "operation %d\n", mmco);
762 return -1;
763 }
764 #endif
765 }
766 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
767 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
768 unsigned int long_arg = get_ue_golomb_31(gb);
769 if (long_arg >= 32 ||
770 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
771 long_arg == 16) &&
772 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
773 av_log(h->avctx, AV_LOG_ERROR,
774 "illegal long ref in memory management control "
775 "operation %d\n", opcode);
776 return -1;
777 }
778 mmco[i].long_arg = long_arg;
779 }
780
781 if (opcode > (unsigned) MMCO_LONG) {
782 av_log(h->avctx, AV_LOG_ERROR,
783 "illegal memory management control operation %d\n",
784 opcode);
785 return -1;
786 }
787 if (opcode == MMCO_END)
788 break;
789 }
790 mmco_index = i;
791 } else {
792 if (first_slice) {
793 ret = ff_generate_sliding_window_mmcos(h, first_slice);
794 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
795 return ret;
796 }
797 mmco_index = -1;
798 }
799 }
800
801 if (first_slice && mmco_index != -1) {
802 h->mmco_index = mmco_index;
803 } else if (!first_slice && mmco_index >= 0 &&
804 (mmco_index != h->mmco_index ||
805 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
806 av_log(h->avctx, AV_LOG_ERROR,
807 "Inconsistent MMCO state between slices [%d, %d]\n",
808 mmco_index, h->mmco_index);
809 return AVERROR_INVALIDDATA;
810 }
811
812 return 0;
813 }