FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h264_refs.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 414 476 87.0%
Branches: 305 396 77.0%

Line Branch Exec Source
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
40 59553 static void pic_as_field(H264Ref *pic, const int parity)
41 {
42 int i;
43
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238212 for (i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
44
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178659 if (parity == PICT_BOTTOM_FIELD)
45 85584 pic->data[i] += pic->linesize[i];
46 178659 pic->reference = parity;
47 178659 pic->linesize[i] *= 2;
48 }
49 59553 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
50 59553 }
51
52 198824 static void ref_from_h264pic(H264Ref *dst, H264Picture *src)
53 {
54 198824 memcpy(dst->data, src->f->data, sizeof(dst->data));
55 198824 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
56 198824 dst->reference = src->reference;
57 198824 dst->poc = src->poc;
58 198824 dst->pic_id = src->pic_id;
59 198824 dst->parent = src;
60 198824 }
61
62 186985 static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add)
63 {
64 186985 int match = !!(src->reference & parity);
65
66
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186985 if (match) {
67 186985 ref_from_h264pic(dest, src);
68
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186985 if (parity != PICT_FRAME) {
69 58524 pic_as_field(dest, parity);
70 58524 dest->pic_id *= 2;
71 58524 dest->pic_id += id_add;
72 }
73 }
74
75 186985 return match;
76 }
77
78 92496 static int build_def_list(H264Ref *def, int def_len,
79 H264Picture * const *in, int len, int is_long, int sel)
80 {
81 92496 int i[2] = { 0 };
82 92496 int index = 0;
83
84
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297640 while (i[0] < len || i[1] < len) {
85
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945348 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
86 740204 i[0]++;
87
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1071671 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
88 866527 i[1]++;
89
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205144 if (i[0] < len) {
90
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156654 av_assert0(index < def_len);
91
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156654 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
92 156654 split_field_copy(&def[index++], in[i[0]++], sel, 1);
93 }
94
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205144 if (i[1] < len) {
95
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30331 av_assert0(index < def_len);
96
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30331 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
97 30331 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
98 }
99 }
100
101 92496 return index;
102 }
103
104 48128 static int add_sorted(H264Picture **sorted, H264Picture * const *src,
105 int len, int limit, int dir)
106 {
107 int i, best_poc;
108 48128 int out_i = 0;
109
110 for (;;) {
111
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122172 best_poc = dir ? INT_MIN : INT_MAX;
112
113
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626716 for (i = 0; i < len; i++) {
114 504544 const int poc = src[i]->poc;
115
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504544 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
116 86132 best_poc = poc;
117 86132 sorted[out_i] = src[i];
118 }
119 }
120
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122172 if (best_poc == (dir ? INT_MIN : INT_MAX))
121 48128 break;
122 74044 limit = sorted[out_i++]->poc - dir;
123 }
124 48128 return out_i;
125 }
126
127 144541 static int mismatches_ref(const H264Context *h, const H264Picture *pic)
128 {
129 144541 const AVFrame *f = pic->f;
130 289082 return (h->cur_pic_ptr->f->width != f->width ||
131
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289082 h->cur_pic_ptr->f->height != f->height ||
132
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144541 h->cur_pic_ptr->f->format != f->format);
133 }
134
135 34216 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
136 {
137 int i, len;
138 int j;
139
140
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34216 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
141 H264Picture *sorted[32];
142 int cur_poc, list;
143 int lens[2];
144
145
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12032 if (FIELD_PICTURE(h))
146 4579 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
147 else
148 7453 cur_poc = h->cur_pic_ptr->poc;
149
150
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36096 for (list = 0; list < 2; list++) {
151 24064 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
152 24064 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
153
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24064 av_assert0(len <= 32);
154
155 24064 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
156 sorted, len, 0, h->picture_structure);
157 48128 len += build_def_list(sl->ref_list[list] + len,
158 24064 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
159 24064 h->long_ref, 16, 1, h->picture_structure);
160
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24064 av_assert0(len <= 32);
161
162
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24064 if (len < sl->ref_count[list])
163 4 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
164 24064 lens[list] = len;
165 }
166
167
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12032 if (lens[0] == lens[1] && lens[1] > 1) {
168
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14476 for (i = 0; i < lens[0] &&
169 12550 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
170
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12550 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
171
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10513 if (i == lens[0]) {
172 1926 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
173 }
174 }
175 } else {
176 22184 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
177 22184 h->short_ref, h->short_ref_count, 0, h->picture_structure);
178 44368 len += build_def_list(sl->ref_list[0] + len,
179 22184 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
180 22184 h-> long_ref, 16, 1, h->picture_structure);
181
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22184 av_assert0(len <= 32);
182
183
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22184 if (len < sl->ref_count[0])
184 832 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
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80464 for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
204
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180477 for (i = 0; i < sl->ref_count[j]; i++) {
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134229 if (sl->ref_list[j][i].parent) {
206
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132702 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
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76232 for (i = 0; i < sl->list_count; i++)
214 42016 h->default_ref[i] = sl->ref_list[i][0];
215 34216 }
216
217 /**
218 * print short term list
219 */
220 51834 static void print_short_term(const H264Context *h)
221 {
222 uint32_t i;
223
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51834 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 51834 }
232
233 /**
234 * print long term list
235 */
236 51834 static void print_long_term(const H264Context *h)
237 {
238 uint32_t i;
239
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51834 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 51834 }
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 */
261 26825 static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
262 {
263 26825 *structure = h->picture_structure;
264
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26825 if (FIELD_PICTURE(h)) {
265
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3427 if (!(pic_num & 1))
266 /* opposite field */
267 1803 *structure ^= PICT_FRAME;
268 3427 pic_num >>= 1;
269 }
270
271 26825 return pic_num;
272 }
273
274 4768 static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
275 {
276 int list, i, j;
277
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11116 for (list = 0; list < sl->list_count; list++) {
278
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22017 for (i = 0; i < sl->ref_count[list]; i++) {
279 15669 H264Ref *frame = &sl->ref_list[list][i];
280 15669 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
281
282 15669 field[0] = *frame;
283
284
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62676 for (j = 0; j < 3; j++)
285 47007 field[0].linesize[j] <<= 1;
286 15669 field[0].reference = PICT_TOP_FIELD;
287 15669 field[0].poc = field[0].parent->field_poc[0];
288
289 15669 field[1] = field[0];
290
291
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62676 for (j = 0; j < 3; j++)
292 47007 field[1].data[j] += frame->parent->f->linesize[j];
293 15669 field[1].reference = PICT_BOTTOM_FIELD;
294 15669 field[1].poc = field[1].parent->field_poc[1];
295 }
296 }
297 4768 }
298
299 34216 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
300 {
301 int list, index, pic_structure;
302
303 34216 print_short_term(h);
304 34216 print_long_term(h);
305
306 34216 h264_initialise_ref_list(h, sl);
307
308
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76232 for (list = 0; list < sl->list_count; list++) {
309 42016 int pred = sl->curr_pic_num;
310
311
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53855 for (index = 0; index < sl->nb_ref_modifications[list]; index++) {
312 11839 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
313 11839 unsigned int val = sl->ref_modifications[list][index].val;
314 unsigned int pic_id;
315 int i;
316 11839 H264Picture *ref = NULL;
317
318
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11839 switch (modification_of_pic_nums_idc) {
319 11276 case 0:
320 case 1: {
321 11276 const unsigned int abs_diff_pic_num = val + 1;
322 int frame_num;
323
324
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11276 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
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11276 if (modification_of_pic_nums_idc == 0)
331 9136 pred -= abs_diff_pic_num;
332 else
333 2140 pred += abs_diff_pic_num;
334 11276 pred &= sl->max_pic_num - 1;
335
336 11276 frame_num = pic_num_extract(h, pred, &pic_structure);
337
338
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37409 for (i = h->short_ref_count - 1; i >= 0; i--) {
339 37409 ref = h->short_ref[i];
340 assert(ref->reference);
341 assert(!ref->long_ref);
342
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37409 if (ref->frame_num == frame_num &&
343
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11276 (ref->reference & pic_structure))
344 11276 break;
345 }
346
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11276 if (i >= 0)
347 11276 ref->pic_id = pred;
348 11276 break;
349 }
350 563 case 2: {
351 int long_idx;
352 563 pic_id = val; // long_term_pic_idx
353
354 563 long_idx = pic_num_extract(h, pic_id, &pic_structure);
355
356
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563 if (long_idx > 31U) {
357 av_log(h->avctx, AV_LOG_ERROR,
358 "long_term_pic_idx overflow\n");
359 return AVERROR_INVALIDDATA;
360 }
361 563 ref = h->long_ref[long_idx];
362 assert(!(ref && !ref->reference));
363
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563 if (ref && (ref->reference & pic_structure)) {
364 563 ref->pic_id = pic_id;
365 assert(ref->long_ref);
366 563 i = 0;
367 } else {
368 i = -1;
369 }
370 563 break;
371 }
372 default:
373 av_assert0(0);
374 }
375
376
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11839 if (i < 0 || mismatches_ref(h, ref)) {
377 av_log(h->avctx, AV_LOG_ERROR,
378 i < 0 ? "reference picture missing during reorder\n" :
379 "mismatching reference\n"
380 );
381 memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
382 } else {
383
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23244 for (i = index; i + 1 < sl->ref_count[list]; i++) {
384
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18303 if (sl->ref_list[list][i].parent &&
385
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16622 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
386
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14683 ref->pic_id == sl->ref_list[list][i].pic_id)
387 6898 break;
388 }
389
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23244 for (; i > index; i--) {
390 11405 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
391 }
392 11839 ref_from_h264pic(&sl->ref_list[list][index], ref);
393
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11839 if (FIELD_PICTURE(h)) {
394 1029 pic_as_field(&sl->ref_list[list][index], pic_structure);
395 }
396 }
397 }
398 }
399
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76232 for (list = 0; list < sl->list_count; list++) {
400
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176245 for (index = 0; index < sl->ref_count[list]; index++) {
401
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134229 if ( !sl->ref_list[list][index].parent
402
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134215 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
403 int i;
404 14 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc);
405
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238 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
406 224 h->last_pocs[i] = INT_MIN;
407
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14 if (h->default_ref[list].parent
408
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14 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3))
409 14 sl->ref_list[list][index] = h->default_ref[list];
410 else
411 return -1;
412 }
413
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134229 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
414 }
415 }
416
417
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34216 if (FRAME_MBAFF(h))
418 4768 h264_fill_mbaff_ref_list(sl);
419
420 34216 return 0;
421 }
422
423 30064 int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx)
424 {
425 int list, index;
426
427 30064 sl->nb_ref_modifications[0] = 0;
428 30064 sl->nb_ref_modifications[1] = 0;
429
430
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72204 for (list = 0; list < sl->list_count; list++) {
431
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42140 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
432 38796 continue;
433
434 3344 for (index = 0; ; index++) {
435 15255 unsigned int op = get_ue_golomb_31(&sl->gb);
436
437
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15255 if (op == 3)
438 3344 break;
439
440
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11911 if (index >= sl->ref_count[list]) {
441 av_log(logctx, AV_LOG_ERROR, "reference count overflow\n");
442 return AVERROR_INVALIDDATA;
443
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11911 } else if (op > 2) {
444 av_log(logctx, AV_LOG_ERROR,
445 "illegal modification_of_pic_nums_idc %u\n",
446 op);
447 return AVERROR_INVALIDDATA;
448 }
449 11911 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb);
450 11911 sl->ref_modifications[list][index].op = op;
451 11911 sl->nb_ref_modifications[list]++;
452 }
453 }
454
455 30064 return 0;
456 }
457
458 /**
459 * Mark a picture as no longer needed for reference. The refmask
460 * argument allows unreferencing of individual fields or the whole frame.
461 * If the picture becomes entirely unreferenced, but is being held for
462 * display purposes, it is marked as such.
463 * @param refmask mask of fields to unreference; the mask is bitwise
464 * anded with the reference marking of pic
465 * @return non-zero if pic becomes entirely unreferenced (except possibly
466 * for display purposes) zero if one of the fields remains in
467 * reference
468 */
469 17349 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
470 {
471 int i;
472
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17349 if (pic->reference &= refmask) {
473 1167 return 0;
474 } else {
475
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33044 for(i = 0; h->delayed_pic[i]; i++)
476
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18267 if(pic == h->delayed_pic[i]){
477 1405 pic->reference = DELAYED_PIC_REF;
478 1405 break;
479 }
480 16182 return 1;
481 }
482 }
483
484 /**
485 * Find a H264Picture in the short term reference list by frame number.
486 * @param frame_num frame number to search for
487 * @param idx the index into h->short_ref where returned picture is found
488 * undefined if no picture found.
489 * @return pointer to the found picture, or NULL if no pic with the provided
490 * frame number is found
491 */
492 45670 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
493 {
494 int i;
495
496
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201683 for (i = 0; i < h->short_ref_count; i++) {
497 185503 H264Picture *pic = h->short_ref[i];
498
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185503 if (h->avctx->debug & FF_DEBUG_MMCO)
499 av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
500
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185503 if (pic->frame_num == frame_num) {
501 29490 *idx = i;
502 29490 return pic;
503 }
504 }
505 16180 return NULL;
506 }
507
508 /**
509 * Remove a picture from the short term reference list by its index in
510 * that list. This does no checking on the provided index; it is assumed
511 * to be valid. Other list entries are shifted down.
512 * @param i index into h->short_ref of picture to remove.
513 */
514 13783 static void remove_short_at_index(H264Context *h, int i)
515 {
516 assert(i >= 0 && i < h->short_ref_count);
517 13783 h->short_ref[i] = NULL;
518
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13783 if (--h->short_ref_count)
519 10479 memmove(&h->short_ref[i], &h->short_ref[i + 1],
520 10479 (h->short_ref_count - i) * sizeof(H264Picture*));
521 13783 }
522
523 /**
524 * @return the removed picture or NULL if an error occurs
525 */
526 30766 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
527 {
528 H264Picture *pic;
529 int i;
530
531
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30766 if (h->avctx->debug & FF_DEBUG_MMCO)
532 av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
533
534 30766 pic = find_short(h, frame_num, &i);
535
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30766 if (pic) {
536
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14629 if (unreference_pic(h, pic, ref_mask))
537 13462 remove_short_at_index(h, i);
538 }
539
540 30766 return pic;
541 }
542
543 /**
544 * Remove a picture from the long term reference list by its index in
545 * that list.
546 * @return the removed picture or NULL if an error occurs
547 */
548 40991 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
549 {
550 H264Picture *pic;
551
552 40991 pic = h->long_ref[i];
553
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40991 if (pic) {
554
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342 if (unreference_pic(h, pic, ref_mask)) {
555 assert(h->long_ref[i]->long_ref == 1);
556 342 h->long_ref[i]->long_ref = 0;
557 342 h->long_ref[i] = NULL;
558 342 h->long_ref_count--;
559 }
560 }
561
562 40991 return pic;
563 }
564
565 2141 void ff_h264_remove_all_refs(H264Context *h)
566 {
567 int i;
568
569
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36397 for (i = 0; i < 16; i++) {
570 34256 remove_long(h, i, 0);
571 }
572 assert(h->long_ref_count == 0);
573
574
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2141 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
575 1045 ff_h264_unref_picture(h, &h->last_pic_for_ec);
576 1045 ff_h264_ref_picture(h, &h->last_pic_for_ec, h->short_ref[0]);
577 }
578
579
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4519 for (i = 0; i < h->short_ref_count; i++) {
580 2378 unreference_pic(h, h->short_ref[i], 0);
581 2378 h->short_ref[i] = NULL;
582 }
583 2141 h->short_ref_count = 0;
584
585 2141 memset(h->default_ref, 0, sizeof(h->default_ref));
586 2141 }
587
588 15058 static void generate_sliding_window_mmcos(H264Context *h)
589 {
590 15058 MMCO *mmco = h->mmco;
591 15058 int nb_mmco = 0;
592
593
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15058 if (h->short_ref_count &&
594
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15032 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count &&
595
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12593 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
596 11414 mmco[0].opcode = MMCO_SHORT2UNUSED;
597 11414 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
598 11414 nb_mmco = 1;
599
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11414 if (FIELD_PICTURE(h)) {
600 1044 mmco[0].short_pic_num *= 2;
601 1044 mmco[1].opcode = MMCO_SHORT2UNUSED;
602 1044 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
603 1044 nb_mmco = 2;
604 }
605 }
606
607 15058 h->nb_mmco = nb_mmco;
608 15058 }
609
610 17618 int ff_h264_execute_ref_pic_marking(H264Context *h)
611 {
612 17618 MMCO *mmco = h->mmco;
613 int mmco_count;
614 17618 int i, av_uninit(j);
615 17618 int pps_ref_count[2] = {0};
616 17618 int current_ref_assigned = 0, err = 0;
617 17618 H264Picture *av_uninit(pic);
618
619
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17618 if (!h->ps.sps) {
620 av_log(h->avctx, AV_LOG_ERROR, "SPS is unset\n");
621 err = AVERROR_INVALIDDATA;
622 goto out;
623 }
624
625
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17618 if (!h->explicit_ref_marking)
626 15058 generate_sliding_window_mmcos(h);
627 17618 mmco_count = h->nb_mmco;
628
629
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17618 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
630 av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
631
632
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33047 for (i = 0; i < mmco_count; i++) {
633 15429 int av_uninit(structure), av_uninit(frame_num);
634
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15429 if (h->avctx->debug & FF_DEBUG_MMCO)
635 av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
636 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
637
638
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15429 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
639
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867 mmco[i].opcode == MMCO_SHORT2LONG) {
640 14904 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
641 14904 pic = find_short(h, frame_num, &j);
642
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14904 if (!pic) {
643
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43 if (mmco[i].opcode != MMCO_SHORT2LONG ||
644
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21 !h->long_ref[mmco[i].long_arg] ||
645
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21 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
646
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22 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
647 22 err = AVERROR_INVALIDDATA;
648 }
649 43 continue;
650 }
651 }
652
653
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15386 switch (mmco[i].opcode) {
654 14540 case MMCO_SHORT2UNUSED:
655
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14540 if (h->avctx->debug & FF_DEBUG_MMCO)
656 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
657 h->mmco[i].short_pic_num, h->short_ref_count);
658 14540 remove_short(h, frame_num, structure ^ PICT_FRAME);
659 14540 break;
660 321 case MMCO_SHORT2LONG:
661
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321 if (h->long_ref[mmco[i].long_arg] != pic)
662 321 remove_long(h, mmco[i].long_arg, 0);
663
664 321 remove_short_at_index(h, j);
665 321 h->long_ref[ mmco[i].long_arg ] = pic;
666
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321 if (h->long_ref[mmco[i].long_arg]) {
667 321 h->long_ref[mmco[i].long_arg]->long_ref = 1;
668 321 h->long_ref_count++;
669 }
670 321 break;
671 82 case MMCO_LONG2UNUSED:
672 82 j = pic_num_extract(h, mmco[i].long_arg, &structure);
673 82 pic = h->long_ref[j];
674
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82 if (pic) {
675 82 remove_long(h, j, structure ^ PICT_FRAME);
676 } else if (h->avctx->debug & FF_DEBUG_MMCO)
677 av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
678 82 break;
679 21 case MMCO_LONG:
680 // Comment below left from previous code as it is an interesting note.
681 /* First field in pair is in short term list or
682 * at a different long term index.
683 * This is not allowed; see 7.4.3.3, notes 2 and 3.
684 * Report the problem and keep the pair where it is,
685 * and mark this field valid.
686 */
687
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21 if (h->short_ref[0] == h->cur_pic_ptr) {
688 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
689 remove_short_at_index(h, 0);
690 }
691
692 /* make sure the current picture is not already assigned as a long ref */
693
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21 if (h->cur_pic_ptr->long_ref) {
694 for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
695 if (h->long_ref[j] == h->cur_pic_ptr) {
696 if (j != mmco[i].long_arg)
697 av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
698 remove_long(h, j, 0);
699 }
700 }
701 }
702
703
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21 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
704
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21 av_assert0(!h->cur_pic_ptr->long_ref);
705 21 remove_long(h, mmco[i].long_arg, 0);
706
707 21 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
708 21 h->long_ref[mmco[i].long_arg]->long_ref = 1;
709 21 h->long_ref_count++;
710 }
711
712 21 h->cur_pic_ptr->reference |= h->picture_structure;
713 21 current_ref_assigned = 1;
714 21 break;
715 407 case MMCO_SET_MAX_LONG:
716 assert(mmco[i].long_arg <= 16);
717 // just remove the long term which index is greater than new max
718
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6478 for (j = mmco[i].long_arg; j < 16; j++) {
719 6071 remove_long(h, j, 0);
720 }
721 407 break;
722 15 case MMCO_RESET:
723
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68 while (h->short_ref_count) {
724 53 remove_short(h, h->short_ref[0]->frame_num, 0);
725 }
726
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255 for (j = 0; j < 16; j++) {
727 240 remove_long(h, j, 0);
728 }
729 15 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
730 15 h->mmco_reset = 1;
731 15 h->cur_pic_ptr->mmco_reset = 1;
732
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255 for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++)
733 240 h->last_pocs[j] = INT_MIN;
734 15 break;
735 default: av_assert0(0);
736 }
737 }
738
739
2/2
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17618 if (!current_ref_assigned) {
740 /* Second field of complementary field pair; the first field of
741 * which is already referenced. If short referenced, it
742 * should be first entry in short_ref. If not, it must exist
743 * in long_ref; trying to put it on the short list here is an
744 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
745 */
746
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17597 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
747 /* Just mark the second field valid */
748 1460 h->cur_pic_ptr->reference |= h->picture_structure;
749
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16137 } else if (h->cur_pic_ptr->long_ref) {
750 av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
751 "assignment for second field "
752 "in complementary field pair "
753 "(first field is long term)\n");
754 err = AVERROR_INVALIDDATA;
755 } else {
756 16137 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
757
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16137 if (pic) {
758 av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
759 err = AVERROR_INVALIDDATA;
760 }
761
762
2/2
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16137 if (h->short_ref_count)
763 11796 memmove(&h->short_ref[1], &h->short_ref[0],
764 11796 h->short_ref_count * sizeof(H264Picture*));
765
766 16137 h->short_ref[0] = h->cur_pic_ptr;
767 16137 h->short_ref_count++;
768 16137 h->cur_pic_ptr->reference |= h->picture_structure;
769 }
770 }
771
772
2/2
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17618 if (h->long_ref_count + h->short_ref_count > FFMAX(h->ps.sps->ref_frame_count, 1)) {
773
774 /* We have too many reference frames, probably due to corrupted
775 * stream. Need to discard one frame. Prevents overrun of the
776 * short_ref and long_ref buffers.
777 */
778 11 av_log(h->avctx, AV_LOG_ERROR,
779 "number of reference frames (%d+%d) exceeds max (%d; probably "
780 "corrupt input), discarding one\n",
781 11 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
782 11 err = AVERROR_INVALIDDATA;
783
784
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11 if (h->long_ref_count && !h->short_ref_count) {
785 for (i = 0; i < 16; ++i)
786 if (h->long_ref[i])
787 break;
788
789 assert(i < 16);
790 remove_long(h, i, 0);
791 } else {
792 11 pic = h->short_ref[h->short_ref_count - 1];
793 11 remove_short(h, pic->frame_num, 0);
794 }
795 }
796
797
2/2
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94244 for (i = 0; i<h->short_ref_count; i++) {
798 76626 pic = h->short_ref[i];
799
2/2
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✓ Branch 1 taken 76225 times.
76626 if (pic->invalid_gap) {
800 401 int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num);
801
2/2
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401 if (d > h->ps.sps->ref_frame_count)
802 25 remove_short(h, pic->frame_num, 0);
803 }
804 }
805
806 17618 print_short_term(h);
807 17618 print_long_term(h);
808
809
2/2
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4527826 for (i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) {
810
2/2
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✓ Branch 1 taken 4492358 times.
4510208 if (h->ps.pps_list[i]) {
811 17850 const PPS *pps = (const PPS *)h->ps.pps_list[i]->data;
812 17850 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]);
813 17850 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]);
814 }
815 }
816
817 // Detect unmarked random access points
818
2/2
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17618 if ( err >= 0
819
2/2
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17607 && h->long_ref_count==0
820
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16562 && ( h->short_ref_count<=2
821
6/6
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9677 || pps_ref_count[0] <= 2 && pps_ref_count[1] <= 1 && h->avctx->has_b_frames
822
5/6
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8802 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
823
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8465 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
824
2/2
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7293 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
825 2218 h->cur_pic_ptr->recovered |= 1;
826
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2218 if(!h->avctx->has_b_frames)
827 1514 h->frame_recovered |= FRAME_RECOVERED_SEI;
828 }
829
830 16104 out:
831
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17618 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
832 }
833
834 22852 int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
835 const H2645NAL *nal, void *logctx)
836 {
837 int i;
838 22852 MMCO *mmco = sl->mmco;
839 22852 int nb_mmco = 0;
840
841
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22852 if (nal->type == H264_NAL_IDR_SLICE) { // FIXME fields
842 2073 skip_bits1(gb); // broken_link
843
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2073 if (get_bits1(gb)) {
844 3 mmco[0].opcode = MMCO_LONG;
845 3 mmco[0].long_arg = 0;
846 3 nb_mmco = 1;
847 }
848 2073 sl->explicit_ref_marking = 1;
849 } else {
850 20779 sl->explicit_ref_marking = get_bits1(gb);
851
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20779 if (sl->explicit_ref_marking) {
852
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6291 for (i = 0; i < MAX_MMCO_COUNT; i++) {
853 6291 MMCOOpcode opcode = get_ue_golomb_31(gb);
854
855 6291 mmco[i].opcode = opcode;
856
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6291 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
857 3586 mmco[i].short_pic_num =
858 3586 (sl->curr_pic_num - get_ue_golomb_long(gb) - 1) &
859 3586 (sl->max_pic_num - 1);
860 }
861
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6291 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
862
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5826 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
863 875 unsigned int long_arg = get_ue_golomb_31(gb);
864
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875 if (long_arg >= 32 ||
865 (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
866 long_arg == 16) &&
867 !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(sl)))) {
868 av_log(logctx, AV_LOG_ERROR,
869 "illegal long ref in memory management control "
870 "operation %d\n", opcode);
871 sl->nb_mmco = i;
872 return -1;
873 }
874 875 mmco[i].long_arg = long_arg;
875 }
876
877
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6291 if (opcode > (unsigned) MMCO_LONG) {
878 av_log(logctx, AV_LOG_ERROR,
879 "illegal memory management control operation %d\n",
880 opcode);
881 sl->nb_mmco = i;
882 return -1;
883 }
884
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6291 if (opcode == MMCO_END)
885 2180 break;
886 }
887 2180 nb_mmco = i;
888 }
889 }
890
891 22852 sl->nb_mmco = nb_mmco;
892
893 22852 return 0;
894 }
895