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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 FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 / MPEG-4 part10 reference picture handling.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28#include <inttypes.h>
29
30#include "libavutil/avassert.h"
31#include "internal.h"
32#include "avcodec.h"
33#include "h264.h"
34#include "h264dec.h"
35#include "golomb.h"
36#include "mpegutils.h"
37
38#include <assert.h>
39
40static void pic_as_field(H264Ref *pic, const int parity)
41{
42 int i;
43 for (i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
44 if (parity == PICT_BOTTOM_FIELD)
45 pic->data[i] += pic->linesize[i];
46 pic->reference = parity;
47 pic->linesize[i] *= 2;
48 }
49 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
50}
51
52static void ref_from_h264pic(H264Ref *dst, H264Picture *src)
53{
54 memcpy(dst->data, src->f->data, sizeof(dst->data));
55 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
56 dst->reference = src->reference;
57 dst->poc = src->poc;
58 dst->pic_id = src->pic_id;
59 dst->parent = src;
60}
61
62static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add)
63{
64 int match = !!(src->reference & parity);
65
66 if (match) {
67 ref_from_h264pic(dest, src);
68 if (parity != PICT_FRAME) {
69 pic_as_field(dest, parity);
70 dest->pic_id *= 2;
71 dest->pic_id += id_add;
72 }
73 }
74
75 return match;
76}
77
78static int build_def_list(H264Ref *def, int def_len,
79 H264Picture * const *in, int len, int is_long, int sel)
80{
81 int i[2] = { 0 };
82 int index = 0;
83
84 while (i[0] < len || i[1] < len) {
85 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
86 i[0]++;
87 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
88 i[1]++;
89 if (i[0] < len) {
90 av_assert0(index < def_len);
91 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
92 split_field_copy(&def[index++], in[i[0]++], sel, 1);
93 }
94 if (i[1] < len) {
95 av_assert0(index < def_len);
96 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
97 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
98 }
99 }
100
101 return index;
102}
103
104static int add_sorted(H264Picture **sorted, H264Picture * const *src,
105 int len, int limit, int dir)
106{
107 int i, best_poc;
108 int out_i = 0;
109
110 for (;;) {
111 best_poc = dir ? INT_MIN : INT_MAX;
112
113 for (i = 0; i < len; i++) {
114 const int poc = src[i]->poc;
115 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
116 best_poc = poc;
117 sorted[out_i] = src[i];
118 }
119 }
120 if (best_poc == (dir ? INT_MIN : INT_MAX))
121 break;
122 limit = sorted[out_i++]->poc - dir;
123 }
124 return out_i;
125}
126
127static int mismatches_ref(const H264Context *h, const H264Picture *pic)
128{
129 const AVFrame *f = pic->f;
130 return (h->cur_pic_ptr->f->width != f->width ||
131 h->cur_pic_ptr->f->height != f->height ||
132 h->cur_pic_ptr->f->format != f->format);
133}
134
135static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
136{
137 int i, len;
138 int j;
139
140 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
141 H264Picture *sorted[32];
142 int cur_poc, list;
143 int lens[2];
144
145 if (FIELD_PICTURE(h))
146 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
147 else
148 cur_poc = h->cur_pic_ptr->poc;
149
150 for (list = 0; list < 2; list++) {
151 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
152 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
153 av_assert0(len <= 32);
154
155 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
156 sorted, len, 0, h->picture_structure);
157 len += build_def_list(sl->ref_list[list] + len,
158 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
159 h->long_ref, 16, 1, h->picture_structure);
160 av_assert0(len <= 32);
161
162 if (len < sl->ref_count[list])
163 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
164 lens[list] = len;
165 }
166
167 if (lens[0] == lens[1] && lens[1] > 1) {
168 for (i = 0; i < lens[0] &&
169 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
170 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
171 if (i == lens[0]) {
172 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
173 }
174 }
175 } else {
176 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
177 h->short_ref, h->short_ref_count, 0, h->picture_structure);
178 len += build_def_list(sl->ref_list[0] + len,
179 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
180 h-> long_ref, 16, 1, h->picture_structure);
181 av_assert0(len <= 32);
182
183 if (len < sl->ref_count[0])
184 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
185 }
186#ifdef TRACE
187 for (i = 0; i < sl->ref_count[0]; i++) {
188 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
189 (sl->ref_list[0][i].parent ? (sl->ref_list[0][i].parent->long_ref ? "LT" : "ST") : "??"),
190 sl->ref_list[0][i].pic_id,
191 sl->ref_list[0][i].data[0]);
192 }
193 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
194 for (i = 0; i < sl->ref_count[1]; i++) {
195 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
196 (sl->ref_list[1][i].parent ? (sl->ref_list[1][i].parent->long_ref ? "LT" : "ST") : "??"),
197 sl->ref_list[1][i].pic_id,
198 sl->ref_list[1][i].data[0]);
199 }
200 }
201#endif
202
203 for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
204 for (i = 0; i < sl->ref_count[j]; i++) {
205 if (sl->ref_list[j][i].parent) {
206 if (mismatches_ref(h, sl->ref_list[j][i].parent)) {
207 av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
208 memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i]));
209 }
210 }
211 }
212 }
213 for (i = 0; i < sl->list_count; i++)
214 h->default_ref[i] = sl->ref_list[i][0];
215}
216
217/**
218 * print short term list
219 */
220static void print_short_term(const H264Context *h)
221{
222 uint32_t i;
223 if (h->avctx->debug & FF_DEBUG_MMCO) {
224 av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
225 for (i = 0; i < h->short_ref_count; i++) {
226 H264Picture *pic = h->short_ref[i];
227 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
228 i, pic->frame_num, pic->poc, pic->f->data[0]);
229 }
230 }
231}
232
233/**
234 * print long term list
235 */
236static void print_long_term(const H264Context *h)
237{
238 uint32_t i;
239 if (h->avctx->debug & FF_DEBUG_MMCO) {
240 av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
241 for (i = 0; i < 16; i++) {
242 H264Picture *pic = h->long_ref[i];
243 if (pic) {
244 av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
245 i, pic->frame_num, pic->poc, pic->f->data[0]);
246 }
247 }
248 }
249}
250
251/**
252 * Extract structure information about the picture described by pic_num in
253 * the current decoding context (frame or field). Note that pic_num is
254 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
255 * @param pic_num picture number for which to extract structure information
256 * @param structure one of PICT_XXX describing structure of picture
257 * with pic_num
258 * @return frame number (short term) or long term index of picture
259 * described by pic_num
260 */
261static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
262{
263 *structure = h->picture_structure;
264 if (FIELD_PICTURE(h)) {
265 if (!(pic_num & 1))
266 /* opposite field */
267 *structure ^= PICT_FRAME;
268 pic_num >>= 1;
269 }
270
271 return pic_num;
272}
273
274static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
275{
276 int list, i, j;
277 for (list = 0; list < sl->list_count; list++) {
278 for (i = 0; i < sl->ref_count[list]; i++) {
279 H264Ref *frame = &sl->ref_list[list][i];
280 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
281
282 field[0] = *frame;
283
284 for (j = 0; j < 3; j++)
285 field[0].linesize[j] <<= 1;
286 field[0].reference = PICT_TOP_FIELD;
287 field[0].poc = field[0].parent->field_poc[0];
288
289 field[1] = field[0];
290
291 for (j = 0; j < 3; j++)
292 field[1].data[j] += frame->parent->f->linesize[j];
293 field[1].reference = PICT_BOTTOM_FIELD;
294 field[1].poc = field[1].parent->field_poc[1];
295 }
296 }
297}
298
299int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
300{
301 int list, index, pic_structure;
302
303 print_short_term(h);
304 print_long_term(h);
305
306 h264_initialise_ref_list(h, sl);
307
308 for (list = 0; list < sl->list_count; list++) {
309 int pred = sl->curr_pic_num;
310
311 for (index = 0; index < sl->nb_ref_modifications[list]; index++) {
312 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
313 unsigned int val = sl->ref_modifications[list][index].val;
314 unsigned int pic_id;
315 int i;
316 H264Picture *ref = NULL;
317
318 switch (modification_of_pic_nums_idc) {
319 case 0:
320 case 1: {
321 const unsigned int abs_diff_pic_num = val + 1;
322 int frame_num;
323
324 if (abs_diff_pic_num > sl->max_pic_num) {
325 av_log(h->avctx, AV_LOG_ERROR,
326 "abs_diff_pic_num overflow\n");
327 return AVERROR_INVALIDDATA;
328 }
329
330 if (modification_of_pic_nums_idc == 0)
331 pred -= abs_diff_pic_num;
332 else
333 pred += abs_diff_pic_num;
334 pred &= sl->max_pic_num - 1;
335
336 frame_num = pic_num_extract(h, pred, &pic_structure);
337
338 for (i = h->short_ref_count - 1; i >= 0; i--) {
339 ref = h->short_ref[i];
340 assert(ref->reference);
341 assert(!ref->long_ref);
342 if (ref->frame_num == frame_num &&
343 (ref->reference & pic_structure))
344 break;
345 }
346 if (i >= 0)
347 ref->pic_id = pred;
348 break;
349 }
350 case 2: {
351 int long_idx;
352 pic_id = val; // long_term_pic_idx
353
354 long_idx = pic_num_extract(h, pic_id, &pic_structure);
355
356 if (long_idx > 31U) {
357 av_log(h->avctx, AV_LOG_ERROR,
358 "long_term_pic_idx overflow\n");
359 return AVERROR_INVALIDDATA;
360 }
361 ref = h->long_ref[long_idx];
362 assert(!(ref && !ref->reference));
363 if (ref && (ref->reference & pic_structure)) {
364 ref->pic_id = pic_id;
365 assert(ref->long_ref);
366 i = 0;
367 } else {
368 i = -1;
369 }
370 break;
371 }
372 default:
373 av_assert0(0);
374 }
375
376 if (i < 0) {
377 av_log(h->avctx, AV_LOG_ERROR,
378 "reference picture missing during reorder\n");
379 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
380 } else {
381 for (i = index; i + 1 < sl->ref_count[list]; i++) {
382 if (sl->ref_list[list][i].parent &&
383 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
384 ref->pic_id == sl->ref_list[list][i].pic_id)
385 break;
386 }
387 for (; i > index; i--) {
388 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
389 }
390 ref_from_h264pic(&sl->ref_list[list][index], ref);
391 if (FIELD_PICTURE(h)) {
392 pic_as_field(&sl->ref_list[list][index], pic_structure);
393 }
394 }
395 }
396 }
397 for (list = 0; list < sl->list_count; list++) {
398 for (index = 0; index < sl->ref_count[list]; index++) {
399 if ( !sl->ref_list[list][index].parent
400 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
401 int i;
402 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc);
403 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
404 h->last_pocs[i] = INT_MIN;
405 if (h->default_ref[list].parent
406 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3))
407 sl->ref_list[list][index] = h->default_ref[list];
408 else
409 return -1;
410 }
411 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
412 }
413 }
414
415 if (FRAME_MBAFF(h))
416 h264_fill_mbaff_ref_list(sl);
417
418 return 0;
419}
420
421int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx)
422{
423 int list, index;
424
425 sl->nb_ref_modifications[0] = 0;
426 sl->nb_ref_modifications[1] = 0;
427
428 for (list = 0; list < sl->list_count; list++) {
429 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
430 continue;
431
432 for (index = 0; ; index++) {
433 unsigned int op = get_ue_golomb_31(&sl->gb);
434
435 if (op == 3)
436 break;
437
438 if (index >= sl->ref_count[list]) {
439 av_log(logctx, AV_LOG_ERROR, "reference count overflow\n");
440 return AVERROR_INVALIDDATA;
441 } else if (op > 2) {
442 av_log(logctx, AV_LOG_ERROR,
443 "illegal modification_of_pic_nums_idc %u\n",
444 op);
445 return AVERROR_INVALIDDATA;
446 }
447 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb);
448 sl->ref_modifications[list][index].op = op;
449 sl->nb_ref_modifications[list]++;
450 }
451 }
452
453 return 0;
454}
455
456/**
457 * Mark a picture as no longer needed for reference. The refmask
458 * argument allows unreferencing of individual fields or the whole frame.
459 * If the picture becomes entirely unreferenced, but is being held for
460 * display purposes, it is marked as such.
461 * @param refmask mask of fields to unreference; the mask is bitwise
462 * anded with the reference marking of pic
463 * @return non-zero if pic becomes entirely unreferenced (except possibly
464 * for display purposes) zero if one of the fields remains in
465 * reference
466 */
467static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
468{
469 int i;
470 if (pic->reference &= refmask) {
471 return 0;
472 } else {
473 for(i = 0; h->delayed_pic[i]; i++)
474 if(pic == h->delayed_pic[i]){
475 pic->reference = DELAYED_PIC_REF;
476 break;
477 }
478 return 1;
479 }
480}
481
482/**
483 * Find a H264Picture in the short term reference list by frame number.
484 * @param frame_num frame number to search for
485 * @param idx the index into h->short_ref where returned picture is found
486 * undefined if no picture found.
487 * @return pointer to the found picture, or NULL if no pic with the provided
488 * frame number is found
489 */
490static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
491{
492 int i;
493
494 for (i = 0; i < h->short_ref_count; i++) {
495 H264Picture *pic = h->short_ref[i];
496 if (h->avctx->debug & FF_DEBUG_MMCO)
497 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
498 if (pic->frame_num == frame_num) {
499 *idx = i;
500 return pic;
501 }
502 }
503 return NULL;
504}
505
506/**
507 * Remove a picture from the short term reference list by its index in
508 * that list. This does no checking on the provided index; it is assumed
509 * to be valid. Other list entries are shifted down.
510 * @param i index into h->short_ref of picture to remove.
511 */
512static void remove_short_at_index(H264Context *h, int i)
513{
514 assert(i >= 0 && i < h->short_ref_count);
515 h->short_ref[i] = NULL;
516 if (--h->short_ref_count)
517 memmove(&h->short_ref[i], &h->short_ref[i + 1],
518 (h->short_ref_count - i) * sizeof(H264Picture*));
519}
520
521/**
522 * @return the removed picture or NULL if an error occurs
523 */
524static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
525{
526 H264Picture *pic;
527 int i;
528
529 if (h->avctx->debug & FF_DEBUG_MMCO)
530 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
531
532 pic = find_short(h, frame_num, &i);
533 if (pic) {
534 if (unreference_pic(h, pic, ref_mask))
535 remove_short_at_index(h, i);
536 }
537
538 return pic;
539}
540
541/**
542 * Remove a picture from the long term reference list by its index in
543 * that list.
544 * @return the removed picture or NULL if an error occurs
545 */
546static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
547{
548 H264Picture *pic;
549
550 pic = h->long_ref[i];
551 if (pic) {
552 if (unreference_pic(h, pic, ref_mask)) {
553 assert(h->long_ref[i]->long_ref == 1);
554 h->long_ref[i]->long_ref = 0;
555 h->long_ref[i] = NULL;
556 h->long_ref_count--;
557 }
558 }
559
560 return pic;
561}
562
563void ff_h264_remove_all_refs(H264Context *h)
564{
565 int i;
566
567 for (i = 0; i < 16; i++) {
568 remove_long(h, i, 0);
569 }
570 assert(h->long_ref_count == 0);
571
572 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
573 ff_h264_unref_picture(h, &h->last_pic_for_ec);
574 ff_h264_ref_picture(h, &h->last_pic_for_ec, h->short_ref[0]);
575 }
576
577 for (i = 0; i < h->short_ref_count; i++) {
578 unreference_pic(h, h->short_ref[i], 0);
579 h->short_ref[i] = NULL;
580 }
581 h->short_ref_count = 0;
582
583 memset(h->default_ref, 0, sizeof(h->default_ref));
584}
585
586static void generate_sliding_window_mmcos(H264Context *h)
587{
588 MMCO *mmco = h->mmco;
589 int nb_mmco = 0;
590
591 if (h->short_ref_count &&
592 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count &&
593 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
594 mmco[0].opcode = MMCO_SHORT2UNUSED;
595 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
596 nb_mmco = 1;
597 if (FIELD_PICTURE(h)) {
598 mmco[0].short_pic_num *= 2;
599 mmco[1].opcode = MMCO_SHORT2UNUSED;
600 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
601 nb_mmco = 2;
602 }
603 }
604
605 h->nb_mmco = nb_mmco;
606}
607
608int ff_h264_execute_ref_pic_marking(H264Context *h)
609{
610 MMCO *mmco = h->mmco;
611 int mmco_count;
612 int i, av_uninit(j);
613 int pps_ref_count[2] = {0};
614 int current_ref_assigned = 0, err = 0;
615 H264Picture *av_uninit(pic);
616
617 if (!h->explicit_ref_marking)
618 generate_sliding_window_mmcos(h);
619 mmco_count = h->nb_mmco;
620
621 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
622 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
623
624 for (i = 0; i < mmco_count; i++) {
625 int av_uninit(structure), av_uninit(frame_num);
626 if (h->avctx->debug & FF_DEBUG_MMCO)
627 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
628 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
629
630 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
631 mmco[i].opcode == MMCO_SHORT2LONG) {
632 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
633 pic = find_short(h, frame_num, &j);
634 if (!pic) {
635 if (mmco[i].opcode != MMCO_SHORT2LONG ||
636 !h->long_ref[mmco[i].long_arg] ||
637 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
638 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
639 err = AVERROR_INVALIDDATA;
640 }
641 continue;
642 }
643 }
644
645 switch (mmco[i].opcode) {
646 case MMCO_SHORT2UNUSED:
647 if (h->avctx->debug & FF_DEBUG_MMCO)
648 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
649 h->mmco[i].short_pic_num, h->short_ref_count);
650 remove_short(h, frame_num, structure ^ PICT_FRAME);
651 break;
652 case MMCO_SHORT2LONG:
653 if (h->long_ref[mmco[i].long_arg] != pic)
654 remove_long(h, mmco[i].long_arg, 0);
655
656 remove_short_at_index(h, j);
657 h->long_ref[ mmco[i].long_arg ] = pic;
658 if (h->long_ref[mmco[i].long_arg]) {
659 h->long_ref[mmco[i].long_arg]->long_ref = 1;
660 h->long_ref_count++;
661 }
662 break;
663 case MMCO_LONG2UNUSED:
664 j = pic_num_extract(h, mmco[i].long_arg, &structure);
665 pic = h->long_ref[j];
666 if (pic) {
667 remove_long(h, j, structure ^ PICT_FRAME);
668 } else if (h->avctx->debug & FF_DEBUG_MMCO)
669 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
670 break;
671 case MMCO_LONG:
672 // Comment below left from previous code as it is an interesting note.
673 /* First field in pair is in short term list or
674 * at a different long term index.
675 * This is not allowed; see 7.4.3.3, notes 2 and 3.
676 * Report the problem and keep the pair where it is,
677 * and mark this field valid.
678 */
679 if (h->short_ref[0] == h->cur_pic_ptr) {
680 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
681 remove_short_at_index(h, 0);
682 }
683
684 /* make sure the current picture is not already assigned as a long ref */
685 if (h->cur_pic_ptr->long_ref) {
686 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
687 if (h->long_ref[j] == h->cur_pic_ptr) {
688 if (j != mmco[i].long_arg)
689 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
690 remove_long(h, j, 0);
691 }
692 }
693 }
694
695 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
696 av_assert0(!h->cur_pic_ptr->long_ref);
697 remove_long(h, mmco[i].long_arg, 0);
698
699 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
700 h->long_ref[mmco[i].long_arg]->long_ref = 1;
701 h->long_ref_count++;
702 }
703
704 h->cur_pic_ptr->reference |= h->picture_structure;
705 current_ref_assigned = 1;
706 break;
707 case MMCO_SET_MAX_LONG:
708 assert(mmco[i].long_arg <= 16);
709 // just remove the long term which index is greater than new max
710 for (j = mmco[i].long_arg; j < 16; j++) {
711 remove_long(h, j, 0);
712 }
713 break;
714 case MMCO_RESET:
715 while (h->short_ref_count) {
716 remove_short(h, h->short_ref[0]->frame_num, 0);
717 }
718 for (j = 0; j < 16; j++) {
719 remove_long(h, j, 0);
720 }
721 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
722 h->mmco_reset = 1;
723 h->cur_pic_ptr->mmco_reset = 1;
724 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
725 h->last_pocs[j] = INT_MIN;
726 break;
727 default: assert(0);
728 }
729 }
730
731 if (!current_ref_assigned) {
732 /* Second field of complementary field pair; the first field of
733 * which is already referenced. If short referenced, it
734 * should be first entry in short_ref. If not, it must exist
735 * in long_ref; trying to put it on the short list here is an
736 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
737 */
738 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
739 /* Just mark the second field valid */
740 h->cur_pic_ptr->reference |= h->picture_structure;
741 } else if (h->cur_pic_ptr->long_ref) {
742 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
743 "assignment for second field "
744 "in complementary field pair "
745 "(first field is long term)\n");
746 err = AVERROR_INVALIDDATA;
747 } else {
748 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
749 if (pic) {
750 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
751 err = AVERROR_INVALIDDATA;
752 }
753
754 if (h->short_ref_count)
755 memmove(&h->short_ref[1], &h->short_ref[0],
756 h->short_ref_count * sizeof(H264Picture*));
757
758 h->short_ref[0] = h->cur_pic_ptr;
759 h->short_ref_count++;
760 h->cur_pic_ptr->reference |= h->picture_structure;
761 }
762 }
763
764 if (h->long_ref_count + h->short_ref_count > FFMAX(h->ps.sps->ref_frame_count, 1)) {
765
766 /* We have too many reference frames, probably due to corrupted
767 * stream. Need to discard one frame. Prevents overrun of the
768 * short_ref and long_ref buffers.
769 */
770 av_log(h->avctx, AV_LOG_ERROR,
771 "number of reference frames (%d+%d) exceeds max (%d; probably "
772 "corrupt input), discarding one\n",
773 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
774 err = AVERROR_INVALIDDATA;
775
776 if (h->long_ref_count && !h->short_ref_count) {
777 for (i = 0; i < 16; ++i)
778 if (h->long_ref[i])
779 break;
780
781 assert(i < 16);
782 remove_long(h, i, 0);
783 } else {
784 pic = h->short_ref[h->short_ref_count - 1];
785 remove_short(h, pic->frame_num, 0);
786 }
787 }
788
789 for (i = 0; i<h->short_ref_count; i++) {
790 pic = h->short_ref[i];
791 if (pic->invalid_gap) {
792 int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num);
793 if (d > h->ps.sps->ref_frame_count)
794 remove_short(h, pic->frame_num, 0);
795 }
796 }
797
798 print_short_term(h);
799 print_long_term(h);
800
801 for (i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) {
802 if (h->ps.pps_list[i]) {
803 const PPS *pps = (const PPS *)h->ps.pps_list[i]->data;
804 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]);
805 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]);
806 }
807 }
808
809 if ( err >= 0
810 && h->long_ref_count==0
811 && ( h->short_ref_count<=2
812 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
813 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
814 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
815 h->cur_pic_ptr->recovered |= 1;
816 if(!h->avctx->has_b_frames)
817 h->frame_recovered |= FRAME_RECOVERED_SEI;
818 }
819
820 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
821}
822
823int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
824 const H2645NAL *nal, void *logctx)
825{
826 int i;
827 MMCO *mmco = sl->mmco;
828 int nb_mmco = 0;
829
830 if (nal->type == H264_NAL_IDR_SLICE) { // FIXME fields
831 skip_bits1(gb); // broken_link
832 if (get_bits1(gb)) {
833 mmco[0].opcode = MMCO_LONG;
834 mmco[0].long_arg = 0;
835 nb_mmco = 1;
836 }
837 sl->explicit_ref_marking = 1;
838 } else {
839 sl->explicit_ref_marking = get_bits1(gb);
840 if (sl->explicit_ref_marking) {
841 for (i = 0; i < MAX_MMCO_COUNT; i++) {
842 MMCOOpcode opcode = get_ue_golomb_31(gb);
843
844 mmco[i].opcode = opcode;
845 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
846 mmco[i].short_pic_num =
847 (sl->curr_pic_num - get_ue_golomb_long(gb) - 1) &
848 (sl->max_pic_num - 1);
849 }
850 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
851 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
852 unsigned int long_arg = get_ue_golomb_31(gb);
853 if (long_arg >= 32 ||
854 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
855 long_arg == 16) &&
856 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(sl)))) {
857 av_log(logctx, AV_LOG_ERROR,
858 "illegal long ref in memory management control "
859 "operation %d\n", opcode);
860 return -1;
861 }
862 mmco[i].long_arg = long_arg;
863 }
864
865 if (opcode > (unsigned) MMCO_LONG) {
866 av_log(logctx, AV_LOG_ERROR,
867 "illegal memory management control operation %d\n",
868 opcode);
869 return -1;
870 }
871 if (opcode == MMCO_END)
872 break;
873 }
874 nb_mmco = i;
875 }
876 }
877
878 sl->nb_mmco = nb_mmco;
879
880 return 0;
881}
882
generated by cgit at 2024-05-17 06:32:26 (GMT)