More correct printf format specifiers
[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 #define COPY_PICTURE(dst, src) \
39 do {\
40 *(dst) = *(src);\
41 (dst)->f.extended_data = (dst)->f.data;\
42 (dst)->tf.f = &(dst)->f;\
43 } while (0)
44
45
46 static void pic_as_field(H264Picture *pic, const int parity){
47 int i;
48 for (i = 0; i < 4; ++i) {
49 if (parity == PICT_BOTTOM_FIELD)
50 pic->f.data[i] += pic->f.linesize[i];
51 pic->reference = parity;
52 pic->f.linesize[i] *= 2;
53 }
54 pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
55 }
56
57 static int split_field_copy(H264Picture *dest, H264Picture *src, int parity, int id_add)
58 {
59 int match = !!(src->reference & parity);
60
61 if (match) {
62 COPY_PICTURE(dest, src);
63 if (parity != PICT_FRAME) {
64 pic_as_field(dest, parity);
65 dest->pic_id *= 2;
66 dest->pic_id += id_add;
67 }
68 }
69
70 return match;
71 }
72
73 static int build_def_list(H264Picture *def, int def_len,
74 H264Picture **in, int len, int is_long, int sel)
75 {
76 int i[2] = { 0 };
77 int index = 0;
78
79 while ((i[0] < len || i[1] < len) && index < def_len) {
80 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
81 i[0]++;
82 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
83 i[1]++;
84 if (i[0] < len && index < def_len) {
85 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
86 split_field_copy(&def[index++], in[i[0]++], sel, 1);
87 }
88 if (i[1] < len && index < def_len) {
89 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
90 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
91 }
92 }
93
94 return index;
95 }
96
97 static int add_sorted(H264Picture **sorted, H264Picture **src, int len, int limit, int dir)
98 {
99 int i, best_poc;
100 int out_i = 0;
101
102 for (;;) {
103 best_poc = dir ? INT_MIN : INT_MAX;
104
105 for (i = 0; i < len; i++) {
106 const int poc = src[i]->poc;
107 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
108 best_poc = poc;
109 sorted[out_i] = src[i];
110 }
111 }
112 if (best_poc == (dir ? INT_MIN : INT_MAX))
113 break;
114 limit = sorted[out_i++]->poc - dir;
115 }
116 return out_i;
117 }
118
119 int ff_h264_fill_default_ref_list(H264Context *h)
120 {
121 int i, len;
122
123 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
124 H264Picture *sorted[32];
125 int cur_poc, list;
126 int lens[2];
127
128 if (FIELD_PICTURE(h))
129 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
130 else
131 cur_poc = h->cur_pic_ptr->poc;
132
133 for (list = 0; list < 2; list++) {
134 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
135 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
136 assert(len <= 32);
137
138 len = build_def_list(h->default_ref_list[list], FF_ARRAY_ELEMS(h->default_ref_list[0]),
139 sorted, len, 0, h->picture_structure);
140 len += build_def_list(h->default_ref_list[list] + len,
141 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
142 h->long_ref, 16, 1, h->picture_structure);
143
144 if (len < h->ref_count[list])
145 memset(&h->default_ref_list[list][len], 0, sizeof(H264Picture) * (h->ref_count[list] - len));
146 lens[list] = len;
147 }
148
149 if (lens[0] == lens[1] && lens[1] > 1) {
150 for (i = 0; i < lens[0] &&
151 h->default_ref_list[0][i].f.buf[0]->buffer ==
152 h->default_ref_list[1][i].f.buf[0]->buffer; i++);
153 if (i == lens[0]) {
154 H264Picture tmp;
155 COPY_PICTURE(&tmp, &h->default_ref_list[1][0]);
156 COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]);
157 COPY_PICTURE(&h->default_ref_list[1][1], &tmp);
158 }
159 }
160 } else {
161 len = build_def_list(h->default_ref_list[0], FF_ARRAY_ELEMS(h->default_ref_list[0]),
162 h->short_ref, h->short_ref_count, 0, h->picture_structure);
163 len += build_def_list(h->default_ref_list[0] + len,
164 FF_ARRAY_ELEMS(h->default_ref_list[0]) - len,
165 h-> long_ref, 16, 1, h->picture_structure);
166
167 if (len < h->ref_count[0])
168 memset(&h->default_ref_list[0][len], 0, sizeof(H264Picture) * (h->ref_count[0] - len));
169 }
170 #ifdef TRACE
171 for (i = 0; i < h->ref_count[0]; i++) {
172 tprintf(h->avctx, "List0: %s fn:%d 0x%p\n",
173 (h->default_ref_list[0][i].long_ref ? "LT" : "ST"),
174 h->default_ref_list[0][i].pic_id,
175 h->default_ref_list[0][i].f.data[0]);
176 }
177 if (h->slice_type_nos == AV_PICTURE_TYPE_B) {
178 for (i = 0; i < h->ref_count[1]; i++) {
179 tprintf(h->avctx, "List1: %s fn:%d 0x%p\n",
180 (h->default_ref_list[1][i].long_ref ? "LT" : "ST"),
181 h->default_ref_list[1][i].pic_id,
182 h->default_ref_list[1][i].f.data[0]);
183 }
184 }
185 #endif
186 return 0;
187 }
188
189 static void print_short_term(H264Context *h);
190 static void print_long_term(H264Context *h);
191
192 /**
193 * Extract structure information about the picture described by pic_num in
194 * the current decoding context (frame or field). Note that pic_num is
195 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
196 * @param pic_num picture number for which to extract structure information
197 * @param structure one of PICT_XXX describing structure of picture
198 * with pic_num
199 * @return frame number (short term) or long term index of picture
200 * described by pic_num
201 */
202 static int pic_num_extract(H264Context *h, int pic_num, int *structure)
203 {
204 *structure = h->picture_structure;
205 if (FIELD_PICTURE(h)) {
206 if (!(pic_num & 1))
207 /* opposite field */
208 *structure ^= PICT_FRAME;
209 pic_num >>= 1;
210 }
211
212 return pic_num;
213 }
214
215 int ff_h264_decode_ref_pic_list_reordering(H264Context *h)
216 {
217 int list, index, pic_structure, i;
218
219 print_short_term(h);
220 print_long_term(h);
221
222 for (list = 0; list < h->list_count; list++) {
223 for (i = 0; i < h->ref_count[list]; i++)
224 COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]);
225
226 if (get_bits1(&h->gb)) { // ref_pic_list_modification_flag_l[01]
227 int pred = h->curr_pic_num;
228
229 for (index = 0; ; index++) {
230 unsigned int modification_of_pic_nums_idc = get_ue_golomb_31(&h->gb);
231 unsigned int pic_id;
232 int i;
233 H264Picture *ref = NULL;
234
235 if (modification_of_pic_nums_idc == 3)
236 break;
237
238 if (index >= h->ref_count[list]) {
239 av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n");
240 return -1;
241 }
242
243 switch (modification_of_pic_nums_idc) {
244 case 0:
245 case 1: {
246 const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1;
247 int frame_num;
248
249 if (abs_diff_pic_num > h->max_pic_num) {
250 av_log(h->avctx, AV_LOG_ERROR,
251 "abs_diff_pic_num overflow\n");
252 return AVERROR_INVALIDDATA;
253 }
254
255 if (modification_of_pic_nums_idc == 0)
256 pred -= abs_diff_pic_num;
257 else
258 pred += abs_diff_pic_num;
259 pred &= h->max_pic_num - 1;
260
261 frame_num = pic_num_extract(h, pred, &pic_structure);
262
263 for (i = h->short_ref_count - 1; i >= 0; i--) {
264 ref = h->short_ref[i];
265 assert(ref->reference);
266 assert(!ref->long_ref);
267 if (ref->frame_num == frame_num &&
268 (ref->reference & pic_structure))
269 break;
270 }
271 if (i >= 0)
272 ref->pic_id = pred;
273 break;
274 }
275 case 2: {
276 int long_idx;
277 pic_id = get_ue_golomb(&h->gb); // long_term_pic_idx
278
279 long_idx = pic_num_extract(h, pic_id, &pic_structure);
280
281 if (long_idx > 31) {
282 av_log(h->avctx, AV_LOG_ERROR,
283 "long_term_pic_idx overflow\n");
284 return AVERROR_INVALIDDATA;
285 }
286 ref = h->long_ref[long_idx];
287 assert(!(ref && !ref->reference));
288 if (ref && (ref->reference & pic_structure)) {
289 ref->pic_id = pic_id;
290 assert(ref->long_ref);
291 i = 0;
292 } else {
293 i = -1;
294 }
295 break;
296 }
297 default:
298 av_log(h->avctx, AV_LOG_ERROR,
299 "illegal modification_of_pic_nums_idc %u\n",
300 modification_of_pic_nums_idc);
301 return AVERROR_INVALIDDATA;
302 }
303
304 if (i < 0) {
305 av_log(h->avctx, AV_LOG_ERROR,
306 "reference picture missing during reorder\n");
307 memset(&h->ref_list[list][index], 0, sizeof(H264Picture)); // FIXME
308 } else {
309 for (i = index; i + 1 < h->ref_count[list]; i++) {
310 if (ref->long_ref == h->ref_list[list][i].long_ref &&
311 ref->pic_id == h->ref_list[list][i].pic_id)
312 break;
313 }
314 for (; i > index; i--) {
315 COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]);
316 }
317 COPY_PICTURE(&h->ref_list[list][index], ref);
318 if (FIELD_PICTURE(h)) {
319 pic_as_field(&h->ref_list[list][index], pic_structure);
320 }
321 }
322 }
323 }
324 }
325 for (list = 0; list < h->list_count; list++) {
326 for (index = 0; index < h->ref_count[list]; index++) {
327 if (!h->ref_list[list][index].f.buf[0]) {
328 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture\n");
329 if (h->default_ref_list[list][0].f.buf[0])
330 COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]);
331 else
332 return -1;
333 }
334 }
335 }
336
337 return 0;
338 }
339
340 void ff_h264_fill_mbaff_ref_list(H264Context *h)
341 {
342 int list, i, j;
343 for (list = 0; list < 2; list++) { //FIXME try list_count
344 for (i = 0; i < h->ref_count[list]; i++) {
345 H264Picture *frame = &h->ref_list[list][i];
346 H264Picture *field = &h->ref_list[list][16 + 2 * i];
347 COPY_PICTURE(field, frame);
348 for (j = 0; j < 3; j++)
349 field[0].f.linesize[j] <<= 1;
350 field[0].reference = PICT_TOP_FIELD;
351 field[0].poc = field[0].field_poc[0];
352 COPY_PICTURE(field + 1, field);
353 for (j = 0; j < 3; j++)
354 field[1].f.data[j] += frame->f.linesize[j];
355 field[1].reference = PICT_BOTTOM_FIELD;
356 field[1].poc = field[1].field_poc[1];
357
358 h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0];
359 h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1];
360 for (j = 0; j < 2; j++) {
361 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];
362 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];
363 }
364 }
365 }
366 }
367
368 /**
369 * Mark a picture as no longer needed for reference. The refmask
370 * argument allows unreferencing of individual fields or the whole frame.
371 * If the picture becomes entirely unreferenced, but is being held for
372 * display purposes, it is marked as such.
373 * @param refmask mask of fields to unreference; the mask is bitwise
374 * anded with the reference marking of pic
375 * @return non-zero if pic becomes entirely unreferenced (except possibly
376 * for display purposes) zero if one of the fields remains in
377 * reference
378 */
379 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
380 {
381 int i;
382 if (pic->reference &= refmask) {
383 return 0;
384 } else {
385 for(i = 0; h->delayed_pic[i]; i++)
386 if(pic == h->delayed_pic[i]){
387 pic->reference = DELAYED_PIC_REF;
388 break;
389 }
390 return 1;
391 }
392 }
393
394 /**
395 * Find a H264Picture in the short term reference list by frame number.
396 * @param frame_num frame number to search for
397 * @param idx the index into h->short_ref where returned picture is found
398 * undefined if no picture found.
399 * @return pointer to the found picture, or NULL if no pic with the provided
400 * frame number is found
401 */
402 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
403 {
404 int i;
405
406 for (i = 0; i < h->short_ref_count; i++) {
407 H264Picture *pic = h->short_ref[i];
408 if (h->avctx->debug & FF_DEBUG_MMCO)
409 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
410 if (pic->frame_num == frame_num) {
411 *idx = i;
412 return pic;
413 }
414 }
415 return NULL;
416 }
417
418 /**
419 * Remove a picture from the short term reference list by its index in
420 * that list. This does no checking on the provided index; it is assumed
421 * to be valid. Other list entries are shifted down.
422 * @param i index into h->short_ref of picture to remove.
423 */
424 static void remove_short_at_index(H264Context *h, int i)
425 {
426 assert(i >= 0 && i < h->short_ref_count);
427 h->short_ref[i] = NULL;
428 if (--h->short_ref_count)
429 memmove(&h->short_ref[i], &h->short_ref[i + 1],
430 (h->short_ref_count - i) * sizeof(H264Picture*));
431 }
432
433 /**
434 *
435 * @return the removed picture or NULL if an error occurs
436 */
437 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
438 {
439 H264Picture *pic;
440 int i;
441
442 if (h->avctx->debug & FF_DEBUG_MMCO)
443 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
444
445 pic = find_short(h, frame_num, &i);
446 if (pic) {
447 if (unreference_pic(h, pic, ref_mask))
448 remove_short_at_index(h, i);
449 }
450
451 return pic;
452 }
453
454 /**
455 * Remove a picture from the long term reference list by its index in
456 * that list.
457 * @return the removed picture or NULL if an error occurs
458 */
459 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
460 {
461 H264Picture *pic;
462
463 pic = h->long_ref[i];
464 if (pic) {
465 if (unreference_pic(h, pic, ref_mask)) {
466 assert(h->long_ref[i]->long_ref == 1);
467 h->long_ref[i]->long_ref = 0;
468 h->long_ref[i] = NULL;
469 h->long_ref_count--;
470 }
471 }
472
473 return pic;
474 }
475
476 void ff_h264_remove_all_refs(H264Context *h)
477 {
478 int i;
479
480 for (i = 0; i < 16; i++) {
481 remove_long(h, i, 0);
482 }
483 assert(h->long_ref_count == 0);
484
485 for (i = 0; i < h->short_ref_count; i++) {
486 unreference_pic(h, h->short_ref[i], 0);
487 h->short_ref[i] = NULL;
488 }
489 h->short_ref_count = 0;
490 }
491
492 /**
493 * print short term list
494 */
495 static void print_short_term(H264Context *h)
496 {
497 uint32_t i;
498 if (h->avctx->debug & FF_DEBUG_MMCO) {
499 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
500 for (i = 0; i < h->short_ref_count; i++) {
501 H264Picture *pic = h->short_ref[i];
502 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
503 i, pic->frame_num, pic->poc, pic->f.data[0]);
504 }
505 }
506 }
507
508 /**
509 * print long term list
510 */
511 static void print_long_term(H264Context *h)
512 {
513 uint32_t i;
514 if (h->avctx->debug & FF_DEBUG_MMCO) {
515 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
516 for (i = 0; i < 16; i++) {
517 H264Picture *pic = h->long_ref[i];
518 if (pic) {
519 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
520 i, pic->frame_num, pic->poc, pic->f.data[0]);
521 }
522 }
523 }
524 }
525
526 static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos)
527 {
528 int i;
529
530 for (i = 0; i < n_mmcos; i++) {
531 if (mmco1[i].opcode != mmco2[i].opcode)
532 return -1;
533 }
534
535 return 0;
536 }
537
538 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
539 {
540 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
541 int mmco_index = 0, i = 0;
542
543 assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
544
545 if (h->short_ref_count &&
546 h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
547 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
548 mmco[0].opcode = MMCO_SHORT2UNUSED;
549 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
550 mmco_index = 1;
551 if (FIELD_PICTURE(h)) {
552 mmco[0].short_pic_num *= 2;
553 mmco[1].opcode = MMCO_SHORT2UNUSED;
554 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
555 mmco_index = 2;
556 }
557 }
558
559 if (first_slice) {
560 h->mmco_index = mmco_index;
561 } else if (!first_slice && mmco_index >= 0 &&
562 (mmco_index != h->mmco_index ||
563 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
564 av_log(h->avctx, AV_LOG_ERROR,
565 "Inconsistent MMCO state between slices [%d, %d, %d]\n",
566 mmco_index, h->mmco_index, i);
567 return AVERROR_INVALIDDATA;
568 }
569 return 0;
570 }
571
572 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
573 {
574 int i, av_uninit(j);
575 int current_ref_assigned = 0, err = 0;
576 H264Picture *av_uninit(pic);
577
578 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
579 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
580
581 for (i = 0; i < mmco_count; i++) {
582 int av_uninit(structure), av_uninit(frame_num);
583 if (h->avctx->debug & FF_DEBUG_MMCO)
584 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
585 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
586
587 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
588 mmco[i].opcode == MMCO_SHORT2LONG) {
589 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
590 pic = find_short(h, frame_num, &j);
591 if (!pic) {
592 if (mmco[i].opcode != MMCO_SHORT2LONG ||
593 !h->long_ref[mmco[i].long_arg] ||
594 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
595 av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
596 err = AVERROR_INVALIDDATA;
597 }
598 continue;
599 }
600 }
601
602 switch (mmco[i].opcode) {
603 case MMCO_SHORT2UNUSED:
604 if (h->avctx->debug & FF_DEBUG_MMCO)
605 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
606 h->mmco[i].short_pic_num, h->short_ref_count);
607 remove_short(h, frame_num, structure ^ PICT_FRAME);
608 break;
609 case MMCO_SHORT2LONG:
610 if (h->long_ref[mmco[i].long_arg] != pic)
611 remove_long(h, mmco[i].long_arg, 0);
612
613 remove_short_at_index(h, j);
614 h->long_ref[ mmco[i].long_arg ] = pic;
615 if (h->long_ref[mmco[i].long_arg]) {
616 h->long_ref[mmco[i].long_arg]->long_ref = 1;
617 h->long_ref_count++;
618 }
619 break;
620 case MMCO_LONG2UNUSED:
621 j = pic_num_extract(h, mmco[i].long_arg, &structure);
622 pic = h->long_ref[j];
623 if (pic) {
624 remove_long(h, j, structure ^ PICT_FRAME);
625 } else if (h->avctx->debug & FF_DEBUG_MMCO)
626 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
627 break;
628 case MMCO_LONG:
629 // Comment below left from previous code as it is an interresting note.
630 /* First field in pair is in short term list or
631 * at a different long term index.
632 * This is not allowed; see 7.4.3.3, notes 2 and 3.
633 * Report the problem and keep the pair where it is,
634 * and mark this field valid.
635 */
636 if (h->short_ref[0] == h->cur_pic_ptr)
637 remove_short_at_index(h, 0);
638
639 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
640 remove_long(h, mmco[i].long_arg, 0);
641
642 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
643 h->long_ref[mmco[i].long_arg]->long_ref = 1;
644 h->long_ref_count++;
645 }
646
647 h->cur_pic_ptr->reference |= h->picture_structure;
648 current_ref_assigned = 1;
649 break;
650 case MMCO_SET_MAX_LONG:
651 assert(mmco[i].long_arg <= 16);
652 // just remove the long term which index is greater than new max
653 for (j = mmco[i].long_arg; j < 16; j++) {
654 remove_long(h, j, 0);
655 }
656 break;
657 case MMCO_RESET:
658 while (h->short_ref_count) {
659 remove_short(h, h->short_ref[0]->frame_num, 0);
660 }
661 for (j = 0; j < 16; j++) {
662 remove_long(h, j, 0);
663 }
664 h->frame_num = h->cur_pic_ptr->frame_num = 0;
665 h->mmco_reset = 1;
666 h->cur_pic_ptr->mmco_reset = 1;
667 break;
668 default: assert(0);
669 }
670 }
671
672 if (!current_ref_assigned) {
673 /* Second field of complementary field pair; the first field of
674 * which is already referenced. If short referenced, it
675 * should be first entry in short_ref. If not, it must exist
676 * in long_ref; trying to put it on the short list here is an
677 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
678 */
679 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
680 /* Just mark the second field valid */
681 h->cur_pic_ptr->reference = PICT_FRAME;
682 } else if (h->cur_pic_ptr->long_ref) {
683 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
684 "assignment for second field "
685 "in complementary field pair "
686 "(first field is long term)\n");
687 err = AVERROR_INVALIDDATA;
688 } else {
689 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
690 if (pic) {
691 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
692 err = AVERROR_INVALIDDATA;
693 }
694
695 if (h->short_ref_count)
696 memmove(&h->short_ref[1], &h->short_ref[0],
697 h->short_ref_count * sizeof(H264Picture*));
698
699 h->short_ref[0] = h->cur_pic_ptr;
700 h->short_ref_count++;
701 h->cur_pic_ptr->reference |= h->picture_structure;
702 }
703 }
704
705 if (h->long_ref_count + h->short_ref_count -
706 (h->short_ref[0] == h->cur_pic_ptr) > h->sps.ref_frame_count) {
707
708 /* We have too many reference frames, probably due to corrupted
709 * stream. Need to discard one frame. Prevents overrun of the
710 * short_ref and long_ref buffers.
711 */
712 av_log(h->avctx, AV_LOG_ERROR,
713 "number of reference frames (%d+%d) exceeds max (%d; probably "
714 "corrupt input), discarding one\n",
715 h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
716 err = AVERROR_INVALIDDATA;
717
718 if (h->long_ref_count && !h->short_ref_count) {
719 for (i = 0; i < 16; ++i)
720 if (h->long_ref[i])
721 break;
722
723 assert(i < 16);
724 remove_long(h, i, 0);
725 } else {
726 pic = h->short_ref[h->short_ref_count - 1];
727 remove_short(h, pic->frame_num, 0);
728 }
729 }
730
731 print_short_term(h);
732 print_long_term(h);
733 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
734 }
735
736 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
737 int first_slice)
738 {
739 int i, ret;
740 MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp;
741 int mmco_index = 0;
742
743 if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields
744 skip_bits1(gb); // broken_link
745 if (get_bits1(gb)) {
746 mmco[0].opcode = MMCO_LONG;
747 mmco[0].long_arg = 0;
748 mmco_index = 1;
749 }
750 } else {
751 if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
752 for (i = 0; i < MAX_MMCO_COUNT; i++) {
753 MMCOOpcode opcode = get_ue_golomb_31(gb);
754
755 mmco[i].opcode = opcode;
756 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
757 mmco[i].short_pic_num =
758 (h->curr_pic_num - get_ue_golomb(gb) - 1) &
759 (h->max_pic_num - 1);
760 #if 0
761 if (mmco[i].short_pic_num >= h->short_ref_count ||
762 h->short_ref[ mmco[i].short_pic_num ] == NULL){
763 av_log(s->avctx, AV_LOG_ERROR,
764 "illegal short ref in memory management control "
765 "operation %d\n", mmco);
766 return -1;
767 }
768 #endif
769 }
770 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
771 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
772 unsigned int long_arg = get_ue_golomb_31(gb);
773 if (long_arg >= 32 ||
774 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
775 long_arg == 16) &&
776 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) {
777 av_log(h->avctx, AV_LOG_ERROR,
778 "illegal long ref in memory management control "
779 "operation %d\n", opcode);
780 return -1;
781 }
782 mmco[i].long_arg = long_arg;
783 }
784
785 if (opcode > (unsigned) MMCO_LONG) {
786 av_log(h->avctx, AV_LOG_ERROR,
787 "illegal memory management control operation %d\n",
788 opcode);
789 return -1;
790 }
791 if (opcode == MMCO_END)
792 break;
793 }
794 mmco_index = i;
795 } else {
796 if (first_slice) {
797 ret = ff_generate_sliding_window_mmcos(h, first_slice);
798 if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE)
799 return ret;
800 }
801 mmco_index = -1;
802 }
803 }
804
805 if (first_slice && mmco_index != -1) {
806 h->mmco_index = mmco_index;
807 } else if (!first_slice && mmco_index >= 0 &&
808 (mmco_index != h->mmco_index ||
809 check_opcodes(h->mmco, mmco_temp, mmco_index))) {
810 av_log(h->avctx, AV_LOG_ERROR,
811 "Inconsistent MMCO state between slices [%d, %d]\n",
812 mmco_index, h->mmco_index);
813 return AVERROR_INVALIDDATA;
814 }
815
816 return 0;
817 }