FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264_refs.c
Date: 2023-09-24 13:02:57
Exec Total Coverage
Lines: 414 476 87.0%
Functions: 22 22 100.0%
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 "avcodec.h"
32 #include "h264.h"
33 #include "h264dec.h"
34 #include "golomb.h"
35 #include "mpegutils.h"
36
37 #include <assert.h>
38
39 62793 static void pic_as_field(H264Ref *pic, const int parity)
40 {
41 int i;
42
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 251172 for (i = 0; i < FF_ARRAY_ELEMS(pic->data); ++i) {
43
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 188379 if (parity == PICT_BOTTOM_FIELD)
44 90192 pic->data[i] += pic->linesize[i];
45 188379 pic->reference = parity;
46 188379 pic->linesize[i] *= 2;
47 }
48 62793 pic->poc = pic->parent->field_poc[parity == PICT_BOTTOM_FIELD];
49 62793 }
50
51 206465 static void ref_from_h264pic(H264Ref *dst, H264Picture *src)
52 {
53 206465 memcpy(dst->data, src->f->data, sizeof(dst->data));
54 206465 memcpy(dst->linesize, src->f->linesize, sizeof(dst->linesize));
55 206465 dst->reference = src->reference;
56 206465 dst->poc = src->poc;
57 206465 dst->pic_id = src->pic_id;
58 206465 dst->parent = src;
59 206465 }
60
61 193979 static int split_field_copy(H264Ref *dest, H264Picture *src, int parity, int id_add)
62 {
63 193979 int match = !!(src->reference & parity);
64
65
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 193979 if (match) {
66 193979 ref_from_h264pic(dest, src);
67
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 193979 if (parity != PICT_FRAME) {
68 61440 pic_as_field(dest, parity);
69 61440 dest->pic_id *= 2;
70 61440 dest->pic_id += id_add;
71 }
72 }
73
74 193979 return match;
75 }
76
77 97118 static int build_def_list(H264Ref *def, int def_len,
78 H264Picture * const *in, int len, int is_long, int sel)
79 {
80 97118 int i[2] = { 0 };
81 97118 int index = 0;
82
83
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 407287 while (i[0] < len || i[1] < len) {
84
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 990351 while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel)))
85 777300 i[0]++;
86
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 1120632 while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3))))
87 907581 i[1]++;
88
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 213051 if (i[0] < len) {
89
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 162130 av_assert0(index < def_len);
90
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 162130 in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num;
91 162130 split_field_copy(&def[index++], in[i[0]++], sel, 1);
92 }
93
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 213051 if (i[1] < len) {
94
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 31849 av_assert0(index < def_len);
95
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 31849 in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num;
96 31849 split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0);
97 }
98 }
99
100 97118 return index;
101 }
102
103 50264 static int add_sorted(H264Picture **sorted, H264Picture * const *src,
104 int len, int limit, int dir)
105 {
106 int i, best_poc;
107 50264 int out_i = 0;
108
109 for (;;) {
110
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 127012 best_poc = dir ? INT_MIN : INT_MAX;
111
112
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 644172 for (i = 0; i < len; i++) {
113 517160 const int poc = src[i]->poc;
114
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 517160 if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) {
115 88836 best_poc = poc;
116 88836 sorted[out_i] = src[i];
117 }
118 }
119
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 127012 if (best_poc == (dir ? INT_MIN : INT_MAX))
120 50264 break;
121 76748 limit = sorted[out_i++]->poc - dir;
122 }
123 50264 return out_i;
124 }
125
126 149472 static int mismatches_ref(const H264Context *h, const H264Picture *pic)
127 {
128 149472 const AVFrame *f = pic->f;
129 298944 return (h->cur_pic_ptr->f->width != f->width ||
130
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 298944 h->cur_pic_ptr->f->height != f->height ||
131
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 149472 h->cur_pic_ptr->f->format != f->format);
132 }
133
134 35993 static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
135 {
136 int i, len;
137 int j;
138
139
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 35993 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
140 H264Picture *sorted[32];
141 int cur_poc, list;
142 int lens[2];
143
144
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 12566 if (FIELD_PICTURE(h))
145 4807 cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
146 else
147 7759 cur_poc = h->cur_pic_ptr->poc;
148
149
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 37698 for (list = 0; list < 2; list++) {
150 25132 len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
151 25132 len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
152
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 25132 av_assert0(len <= 32);
153
154 25132 len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
155 sorted, len, 0, h->picture_structure);
156 50264 len += build_def_list(sl->ref_list[list] + len,
157 25132 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
158 25132 h->long_ref, 16, 1, h->picture_structure);
159
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 25132 av_assert0(len <= 32);
160
161
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 25132 if (len < sl->ref_count[list])
162 4 memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
163 25132 lens[list] = len;
164 }
165
166
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 12566 if (lens[0] == lens[1] && lens[1] > 1) {
167
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 15010 for (i = 0; i < lens[0] &&
168 13084 sl->ref_list[0][i].parent->f->buf[0]->buffer ==
169
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 13084 sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
170
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 11047 if (i == lens[0]) {
171 1926 FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
172 }
173 }
174 } else {
175 23427 len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
176 23427 h->short_ref, h->short_ref_count, 0, h->picture_structure);
177 46854 len += build_def_list(sl->ref_list[0] + len,
178 23427 FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
179 23427 h-> long_ref, 16, 1, h->picture_structure);
180
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 23427 av_assert0(len <= 32);
181
182
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 23427 if (len < sl->ref_count[0])
183 904 memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
184 }
185 #ifdef TRACE
186 for (i = 0; i < sl->ref_count[0]; i++) {
187 ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
188 (sl->ref_list[0][i].parent ? (sl->ref_list[0][i].parent->long_ref ? "LT" : "ST") : "??"),
189 sl->ref_list[0][i].pic_id,
190 sl->ref_list[0][i].data[0]);
191 }
192 if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
193 for (i = 0; i < sl->ref_count[1]; i++) {
194 ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
195 (sl->ref_list[1][i].parent ? (sl->ref_list[1][i].parent->long_ref ? "LT" : "ST") : "??"),
196 sl->ref_list[1][i].pic_id,
197 sl->ref_list[1][i].data[0]);
198 }
199 }
200 #endif
201
202
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 84552 for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
203
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 187144 for (i = 0; i < sl->ref_count[j]; i++) {
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 138585 if (sl->ref_list[j][i].parent) {
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 136986 if (mismatches_ref(h, sl->ref_list[j][i].parent)) {
206 ✗ av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
207 ✗ memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i]));
208 }
209 }
210 }
211 }
212
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 80104 for (i = 0; i < sl->list_count; i++)
213 44111 h->default_ref[i] = sl->ref_list[i][0];
214 35993 }
215
216 /**
217 * print short term list
218 */
219 54321 static void print_short_term(const H264Context *h)
220 {
221 uint32_t i;
222
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 54321 if (h->avctx->debug & FF_DEBUG_MMCO) {
223 ✗ av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n");
224 ✗ for (i = 0; i < h->short_ref_count; i++) {
225 ✗ H264Picture *pic = h->short_ref[i];
226 ✗ av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
227 ✗ i, pic->frame_num, pic->poc, pic->f->data[0]);
228 }
229 }
230 54321 }
231
232 /**
233 * print long term list
234 */
235 54321 static void print_long_term(const H264Context *h)
236 {
237 uint32_t i;
238
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 54321 if (h->avctx->debug & FF_DEBUG_MMCO) {
239 ✗ av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n");
240 ✗ for (i = 0; i < 16; i++) {
241 ✗ H264Picture *pic = h->long_ref[i];
242 ✗ if (pic) {
243 ✗ av_log(h->avctx, AV_LOG_DEBUG, "%"PRIu32" fn:%d poc:%d %p\n",
244 ✗ i, pic->frame_num, pic->poc, pic->f->data[0]);
245 }
246 }
247 }
248 54321 }
249
250 /**
251 * Extract structure information about the picture described by pic_num in
252 * the current decoding context (frame or field). Note that pic_num is
253 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
254 * @param pic_num picture number for which to extract structure information
255 * @param structure one of PICT_XXX describing structure of picture
256 * with pic_num
257 * @return frame number (short term) or long term index of picture
258 * described by pic_num
259 */
260 28113 static int pic_num_extract(const H264Context *h, int pic_num, int *structure)
261 {
262 28113 *structure = h->picture_structure;
263
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 28113 if (FIELD_PICTURE(h)) {
264
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 3781 if (!(pic_num & 1))
265 /* opposite field */
266 2004 *structure ^= PICT_FRAME;
267 3781 pic_num >>= 1;
268 }
269
270 28113 return pic_num;
271 }
272
273 4970 static void h264_fill_mbaff_ref_list(H264SliceContext *sl)
274 {
275 int list, i, j;
276
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 11636 for (list = 0; list < sl->list_count; list++) {
277
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 22695 for (i = 0; i < sl->ref_count[list]; i++) {
278 16029 H264Ref *frame = &sl->ref_list[list][i];
279 16029 H264Ref *field = &sl->ref_list[list][16 + 2 * i];
280
281 16029 field[0] = *frame;
282
283
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 64116 for (j = 0; j < 3; j++)
284 48087 field[0].linesize[j] <<= 1;
285 16029 field[0].reference = PICT_TOP_FIELD;
286 16029 field[0].poc = field[0].parent->field_poc[0];
287
288 16029 field[1] = field[0];
289
290
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 64116 for (j = 0; j < 3; j++)
291 48087 field[1].data[j] += frame->parent->f->linesize[j];
292 16029 field[1].reference = PICT_BOTTOM_FIELD;
293 16029 field[1].poc = field[1].parent->field_poc[1];
294 }
295 }
296 4970 }
297
298 35993 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl)
299 {
300 int list, index, pic_structure;
301
302 35993 print_short_term(h);
303 35993 print_long_term(h);
304
305 35993 h264_initialise_ref_list(h, sl);
306
307
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 80104 for (list = 0; list < sl->list_count; list++) {
308 44111 int pred = sl->curr_pic_num;
309
310
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 56597 for (index = 0; index < sl->nb_ref_modifications[list]; index++) {
311 12486 unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
312 12486 unsigned int val = sl->ref_modifications[list][index].val;
313 unsigned int pic_id;
314 int i;
315 12486 H264Picture *ref = NULL;
316
317
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 12486 switch (modification_of_pic_nums_idc) {
318 11923 case 0:
319 case 1: {
320 11923 const unsigned int abs_diff_pic_num = val + 1;
321 int frame_num;
322
323
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 11923 if (abs_diff_pic_num > sl->max_pic_num) {
324 ✗ av_log(h->avctx, AV_LOG_ERROR,
325 "abs_diff_pic_num overflow\n");
326 ✗ return AVERROR_INVALIDDATA;
327 }
328
329
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 11923 if (modification_of_pic_nums_idc == 0)
330 9735 pred -= abs_diff_pic_num;
331 else
332 2188 pred += abs_diff_pic_num;
333 11923 pred &= sl->max_pic_num - 1;
334
335 11923 frame_num = pic_num_extract(h, pred, &pic_structure);
336
337
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 38695 for (i = h->short_ref_count - 1; i >= 0; i--) {
338 38695 ref = h->short_ref[i];
339 assert(ref->reference);
340 assert(!ref->long_ref);
341
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 38695 if (ref->frame_num == frame_num &&
342
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 11923 (ref->reference & pic_structure))
343 11923 break;
344 }
345
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 11923 if (i >= 0)
346 11923 ref->pic_id = pred;
347 11923 break;
348 }
349 563 case 2: {
350 int long_idx;
351 563 pic_id = val; // long_term_pic_idx
352
353 563 long_idx = pic_num_extract(h, pic_id, &pic_structure);
354
355
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 563 if (long_idx > 31U) {
356 ✗ av_log(h->avctx, AV_LOG_ERROR,
357 "long_term_pic_idx overflow\n");
358 ✗ return AVERROR_INVALIDDATA;
359 }
360 563 ref = h->long_ref[long_idx];
361 assert(!(ref && !ref->reference));
362
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 563 if (ref && (ref->reference & pic_structure)) {
363 563 ref->pic_id = pic_id;
364 assert(ref->long_ref);
365 563 i = 0;
366 } else {
367 ✗ i = -1;
368 }
369 563 break;
370 }
371 ✗ default:
372 ✗ av_assert0(0);
373 }
374
375
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 12486 if (i < 0 || mismatches_ref(h, ref)) {
376 ✗ av_log(h->avctx, AV_LOG_ERROR,
377 i < 0 ? "reference picture missing during reorder\n" :
378 "mismatching reference\n"
379 );
380 ✗ memset(&sl->ref_list[list][index], 0, sizeof(sl->ref_list[0][0])); // FIXME
381 } else {
382
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 24418 for (i = index; i + 1 < sl->ref_count[list]; i++) {
383
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 19197 if (sl->ref_list[list][i].parent &&
384
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 17516 ref->long_ref == sl->ref_list[list][i].parent->long_ref &&
385
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 15577 ref->pic_id == sl->ref_list[list][i].pic_id)
386 7265 break;
387 }
388
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 24418 for (; i > index; i--) {
389 11932 sl->ref_list[list][i] = sl->ref_list[list][i - 1];
390 }
391 12486 ref_from_h264pic(&sl->ref_list[list][index], ref);
392
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 12486 if (FIELD_PICTURE(h)) {
393 1353 pic_as_field(&sl->ref_list[list][index], pic_structure);
394 }
395 }
396 }
397 }
398
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 80104 for (list = 0; list < sl->list_count; list++) {
399
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 182696 for (index = 0; index < sl->ref_count[list]; index++) {
400
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 138585 if ( !sl->ref_list[list][index].parent
401
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 138571 || (!FIELD_PICTURE(h) && (sl->ref_list[list][index].reference&3) != 3)) {
402 int i;
403 14 av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref[list].poc);
404
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 238 for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
405 224 h->last_pocs[i] = INT_MIN;
406
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 14 if (h->default_ref[list].parent
407
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 14 && !(!FIELD_PICTURE(h) && (h->default_ref[list].reference&3) != 3))
408 14 sl->ref_list[list][index] = h->default_ref[list];
409 else
410 ✗ return -1;
411 }
412
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 138585 av_assert0(av_buffer_get_ref_count(sl->ref_list[list][index].parent->f->buf[0]) > 0);
413 }
414 }
415
416
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 35993 if (FRAME_MBAFF(h))
417 4970 h264_fill_mbaff_ref_list(sl);
418
419 35993 return 0;
420 }
421
422 31625 int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx)
423 {
424 int list, index;
425
426 31625 sl->nb_ref_modifications[0] = 0;
427 31625 sl->nb_ref_modifications[1] = 0;
428
429
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 75860 for (list = 0; list < sl->list_count; list++) {
430
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 44235 if (!get_bits1(&sl->gb)) // ref_pic_list_modification_flag_l[01]
431 40683 continue;
432
433 3552 for (index = 0; ; index++) {
434 16110 unsigned int op = get_ue_golomb_31(&sl->gb);
435
436
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 16110 if (op == 3)
437 3552 break;
438
439
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 12558 if (index >= sl->ref_count[list]) {
440 ✗ av_log(logctx, AV_LOG_ERROR, "reference count overflow\n");
441 ✗ return AVERROR_INVALIDDATA;
442
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 12558 } else if (op > 2) {
443 ✗ av_log(logctx, AV_LOG_ERROR,
444 "illegal modification_of_pic_nums_idc %u\n",
445 op);
446 ✗ return AVERROR_INVALIDDATA;
447 }
448 12558 sl->ref_modifications[list][index].val = get_ue_golomb_long(&sl->gb);
449 12558 sl->ref_modifications[list][index].op = op;
450 12558 sl->nb_ref_modifications[list]++;
451 }
452 }
453
454 31625 return 0;
455 }
456
457 /**
458 * Mark a picture as no longer needed for reference. The refmask
459 * argument allows unreferencing of individual fields or the whole frame.
460 * If the picture becomes entirely unreferenced, but is being held for
461 * display purposes, it is marked as such.
462 * @param refmask mask of fields to unreference; the mask is bitwise
463 * anded with the reference marking of pic
464 * @return non-zero if pic becomes entirely unreferenced (except possibly
465 * for display purposes) zero if one of the fields remains in
466 * reference
467 */
468 18083 static inline int unreference_pic(H264Context *h, H264Picture *pic, int refmask)
469 {
470 int i;
471
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 18083 if (pic->reference &= refmask) {
472 1182 return 0;
473 } else {
474
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 33861 for(i = 0; h->delayed_pic[i]; i++)
475
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 18378 if(pic == h->delayed_pic[i]){
476 1418 pic->reference = DELAYED_PIC_REF;
477 1418 break;
478 }
479 16901 return 1;
480 }
481 }
482
483 /**
484 * Find a H264Picture in the short term reference list by frame number.
485 * @param frame_num frame number to search for
486 * @param idx the index into h->short_ref where returned picture is found
487 * undefined if no picture found.
488 * @return pointer to the found picture, or NULL if no pic with the provided
489 * frame number is found
490 */
491 47635 static H264Picture *find_short(H264Context *h, int frame_num, int *idx)
492 {
493 int i;
494
495
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 207717 for (i = 0; i < h->short_ref_count; i++) {
496 190842 H264Picture *pic = h->short_ref[i];
497
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 190842 if (h->avctx->debug & FF_DEBUG_MMCO)
498 ✗ av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
499
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 190842 if (pic->frame_num == frame_num) {
500 30760 *idx = i;
501 30760 return pic;
502 }
503 }
504 16875 return NULL;
505 }
506
507 /**
508 * Remove a picture from the short term reference list by its index in
509 * that list. This does no checking on the provided index; it is assumed
510 * to be valid. Other list entries are shifted down.
511 * @param i index into h->short_ref of picture to remove.
512 */
513 14397 static void remove_short_at_index(H264Context *h, int i)
514 {
515 assert(i >= 0 && i < h->short_ref_count);
516 14397 h->short_ref[i] = NULL;
517
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 14397 if (--h->short_ref_count)
518 10872 memmove(&h->short_ref[i], &h->short_ref[i + 1],
519 10872 (h->short_ref_count - i) * sizeof(H264Picture*));
520 14397 }
521
522 /**
523 * @return the removed picture or NULL if an error occurs
524 */
525 32090 static H264Picture *remove_short(H264Context *h, int frame_num, int ref_mask)
526 {
527 H264Picture *pic;
528 int i;
529
530
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 32090 if (h->avctx->debug & FF_DEBUG_MMCO)
531 ✗ av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
532
533 32090 pic = find_short(h, frame_num, &i);
534
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 32090 if (pic) {
535
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 15258 if (unreference_pic(h, pic, ref_mask))
536 14076 remove_short_at_index(h, i);
537 }
538
539 32090 return pic;
540 }
541
542 /**
543 * Remove a picture from the long term reference list by its index in
544 * that list.
545 * @return the removed picture or NULL if an error occurs
546 */
547 43007 static H264Picture *remove_long(H264Context *h, int i, int ref_mask)
548 {
549 H264Picture *pic;
550
551 43007 pic = h->long_ref[i];
552
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 43007 if (pic) {
553
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 342 if (unreference_pic(h, pic, ref_mask)) {
554 assert(h->long_ref[i]->long_ref == 1);
555 342 h->long_ref[i]->long_ref = 0;
556 342 h->long_ref[i] = NULL;
557 342 h->long_ref_count--;
558 }
559 }
560
561 43007 return pic;
562 }
563
564 2267 void ff_h264_remove_all_refs(H264Context *h)
565 {
566 int i;
567
568
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 38539 for (i = 0; i < 16; i++) {
569 36272 remove_long(h, i, 0);
570 }
571 assert(h->long_ref_count == 0);
572
573
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 2267 if (h->short_ref_count && !h->last_pic_for_ec.f->data[0]) {
574 1100 ff_h264_unref_picture(h, &h->last_pic_for_ec);
575 1100 ff_h264_ref_picture(h, &h->last_pic_for_ec, h->short_ref[0]);
576 }
577
578
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 4750 for (i = 0; i < h->short_ref_count; i++) {
579 2483 unreference_pic(h, h->short_ref[i], 0);
580 2483 h->short_ref[i] = NULL;
581 }
582 2267 h->short_ref_count = 0;
583
584 2267 memset(h->default_ref, 0, sizeof(h->default_ref));
585 2267 }
586
587 15698 static void generate_sliding_window_mmcos(H264Context *h)
588 {
589 15698 MMCO *mmco = h->mmco;
590 15698 int nb_mmco = 0;
591
592
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 15698 if (h->short_ref_count &&
593
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 15670 h->long_ref_count + h->short_ref_count >= h->ps.sps->ref_frame_count &&
594
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 13183 !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) {
595 12004 mmco[0].opcode = MMCO_SHORT2UNUSED;
596 12004 mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num;
597 12004 nb_mmco = 1;
598
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 12004 if (FIELD_PICTURE(h)) {
599 1044 mmco[0].short_pic_num *= 2;
600 1044 mmco[1].opcode = MMCO_SHORT2UNUSED;
601 1044 mmco[1].short_pic_num = mmco[0].short_pic_num + 1;
602 1044 nb_mmco = 2;
603 }
604 }
605
606 15698 h->nb_mmco = nb_mmco;
607 15698 }
608
609 18328 int ff_h264_execute_ref_pic_marking(H264Context *h)
610 {
611 18328 MMCO *mmco = h->mmco;
612 int mmco_count;
613 18328 int i, av_uninit(j);
614 18328 int pps_ref_count[2] = {0};
615 18328 int current_ref_assigned = 0, err = 0;
616 18328 H264Picture *av_uninit(pic);
617
618
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 18328 if (!h->ps.sps) {
619 ✗ av_log(h->avctx, AV_LOG_ERROR, "SPS is unset\n");
620 ✗ err = AVERROR_INVALIDDATA;
621 ✗ goto out;
622 }
623
624
2/2
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 18328 if (!h->explicit_ref_marking)
625 15698 generate_sliding_window_mmcos(h);
626 18328 mmco_count = h->nb_mmco;
627
628
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 18328 if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
629 ✗ av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n");
630
631
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 34398 for (i = 0; i < mmco_count; i++) {
632 16070 int av_uninit(structure), av_uninit(frame_num);
633
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 16070 if (h->avctx->debug & FF_DEBUG_MMCO)
634 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode,
635 h->mmco[i].short_pic_num, h->mmco[i].long_arg);
636
637
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 16070 if (mmco[i].opcode == MMCO_SHORT2UNUSED ||
638
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 867 mmco[i].opcode == MMCO_SHORT2LONG) {
639 15545 frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
640 15545 pic = find_short(h, frame_num, &j);
641
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 15545 if (!pic) {
642
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 43 if (mmco[i].opcode != MMCO_SHORT2LONG ||
643
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 21 !h->long_ref[mmco[i].long_arg] ||
644
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 21 h->long_ref[mmco[i].long_arg]->frame_num != frame_num) {
645
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 22 av_log(h->avctx, h->short_ref_count ? AV_LOG_ERROR : AV_LOG_DEBUG, "mmco: unref short failure\n");
646 22 err = AVERROR_INVALIDDATA;
647 }
648 43 continue;
649 }
650 }
651
652
6/7
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 16027 switch (mmco[i].opcode) {
653 15181 case MMCO_SHORT2UNUSED:
654
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 15181 if (h->avctx->debug & FF_DEBUG_MMCO)
655 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n",
656 h->mmco[i].short_pic_num, h->short_ref_count);
657 15181 remove_short(h, frame_num, structure ^ PICT_FRAME);
658 15181 break;
659 321 case MMCO_SHORT2LONG:
660
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 321 if (h->long_ref[mmco[i].long_arg] != pic)
661 321 remove_long(h, mmco[i].long_arg, 0);
662
663 321 remove_short_at_index(h, j);
664 321 h->long_ref[ mmco[i].long_arg ] = pic;
665
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 321 if (h->long_ref[mmco[i].long_arg]) {
666 321 h->long_ref[mmco[i].long_arg]->long_ref = 1;
667 321 h->long_ref_count++;
668 }
669 321 break;
670 82 case MMCO_LONG2UNUSED:
671 82 j = pic_num_extract(h, mmco[i].long_arg, &structure);
672 82 pic = h->long_ref[j];
673
1/2
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 82 if (pic) {
674 82 remove_long(h, j, structure ^ PICT_FRAME);
675 ✗ } else if (h->avctx->debug & FF_DEBUG_MMCO)
676 ✗ av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
677 82 break;
678 21 case MMCO_LONG:
679 // Comment below left from previous code as it is an interesting note.
680 /* First field in pair is in short term list or
681 * at a different long term index.
682 * This is not allowed; see 7.4.3.3, notes 2 and 3.
683 * Report the problem and keep the pair where it is,
684 * and mark this field valid.
685 */
686
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 21 if (h->short_ref[0] == h->cur_pic_ptr) {
687 ✗ av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to short and long at the same time\n");
688 ✗ remove_short_at_index(h, 0);
689 }
690
691 /* make sure the current picture is not already assigned as a long ref */
692
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 21 if (h->cur_pic_ptr->long_ref) {
693 ✗ for (j = 0; j < FF_ARRAY_ELEMS(h->long_ref); j++) {
694 ✗ if (h->long_ref[j] == h->cur_pic_ptr) {
695 ✗ if (j != mmco[i].long_arg)
696 ✗ av_log(h->avctx, AV_LOG_ERROR, "mmco: cannot assign current picture to 2 long term references\n");
697 ✗ remove_long(h, j, 0);
698 }
699 }
700 }
701
702
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 21 if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) {
703
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 21 av_assert0(!h->cur_pic_ptr->long_ref);
704 21 remove_long(h, mmco[i].long_arg, 0);
705
706 21 h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr;
707 21 h->long_ref[mmco[i].long_arg]->long_ref = 1;
708 21 h->long_ref_count++;
709 }
710
711 21 h->cur_pic_ptr->reference |= h->picture_structure;
712 21 current_ref_assigned = 1;
713 21 break;
714 407 case MMCO_SET_MAX_LONG:
715 assert(mmco[i].long_arg <= 16);
716 // just remove the long term which index is greater than new max
717
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 6478 for (j = mmco[i].long_arg; j < 16; j++) {
718 6071 remove_long(h, j, 0);
719 }
720 407 break;
721 15 case MMCO_RESET:
722
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 68 while (h->short_ref_count) {
723 53 remove_short(h, h->short_ref[0]->frame_num, 0);
724 }
725
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 255 for (j = 0; j < 16; j++) {
726 240 remove_long(h, j, 0);
727 }
728 15 h->poc.frame_num = h->cur_pic_ptr->frame_num = 0;
729 15 h->mmco_reset = 1;
730 15 h->cur_pic_ptr->mmco_reset = 1;
731
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 255 for (j = 0; j < FF_ARRAY_ELEMS(h->last_pocs); j++)
732 240 h->last_pocs[j] = INT_MIN;
733 15 break;
734 ✗ default: av_assert0(0);
735 }
736 }
737
738
2/2
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 18328 if (!current_ref_assigned) {
739 /* Second field of complementary field pair; the first field of
740 * which is already referenced. If short referenced, it
741 * should be first entry in short_ref. If not, it must exist
742 * in long_ref; trying to put it on the short list here is an
743 * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
744 */
745
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 18307 if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) {
746 /* Just mark the second field valid */
747 1475 h->cur_pic_ptr->reference |= h->picture_structure;
748
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 16832 } else if (h->cur_pic_ptr->long_ref) {
749 ✗ av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference "
750 "assignment for second field "
751 "in complementary field pair "
752 "(first field is long term)\n");
753 ✗ err = AVERROR_INVALIDDATA;
754 } else {
755 16832 pic = remove_short(h, h->cur_pic_ptr->frame_num, 0);
756
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 16832 if (pic) {
757 ✗ av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
758 ✗ err = AVERROR_INVALIDDATA;
759 }
760
761
2/2
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 16832 if (h->short_ref_count)
762 12223 memmove(&h->short_ref[1], &h->short_ref[0],
763 12223 h->short_ref_count * sizeof(H264Picture*));
764
765 16832 h->short_ref[0] = h->cur_pic_ptr;
766 16832 h->short_ref_count++;
767 16832 h->cur_pic_ptr->reference |= h->picture_structure;
768 }
769 }
770
771
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 18328 if (h->long_ref_count + h->short_ref_count > FFMAX(h->ps.sps->ref_frame_count, 1)) {
772
773 /* We have too many reference frames, probably due to corrupted
774 * stream. Need to discard one frame. Prevents overrun of the
775 * short_ref and long_ref buffers.
776 */
777 11 av_log(h->avctx, AV_LOG_ERROR,
778 "number of reference frames (%d+%d) exceeds max (%d; probably "
779 "corrupt input), discarding one\n",
780 11 h->long_ref_count, h->short_ref_count, h->ps.sps->ref_frame_count);
781 11 err = AVERROR_INVALIDDATA;
782
783
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 11 if (h->long_ref_count && !h->short_ref_count) {
784 ✗ for (i = 0; i < 16; ++i)
785 ✗ if (h->long_ref[i])
786 ✗ break;
787
788 assert(i < 16);
789 ✗ remove_long(h, i, 0);
790 } else {
791 11 pic = h->short_ref[h->short_ref_count - 1];
792 11 remove_short(h, pic->frame_num, 0);
793 }
794 }
795
796
2/2
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 97076 for (i = 0; i<h->short_ref_count; i++) {
797 78748 pic = h->short_ref[i];
798
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 78748 if (pic->invalid_gap) {
799 326 int d = av_mod_uintp2(h->cur_pic_ptr->frame_num - pic->frame_num, h->ps.sps->log2_max_frame_num);
800
2/2
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 326 if (d > h->ps.sps->ref_frame_count)
801 13 remove_short(h, pic->frame_num, 0);
802 }
803 }
804
805 18328 print_short_term(h);
806 18328 print_long_term(h);
807
808
2/2
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 4710296 for (i = 0; i < FF_ARRAY_ELEMS(h->ps.pps_list); i++) {
809
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✓ Branch 1 taken 4673377 times.
 4691968 if (h->ps.pps_list[i]) {
810 18591 const PPS *pps = (const PPS *)h->ps.pps_list[i]->data;
811 18591 pps_ref_count[0] = FFMAX(pps_ref_count[0], pps->ref_count[0]);
812 18591 pps_ref_count[1] = FFMAX(pps_ref_count[1], pps->ref_count[1]);
813 }
814 }
815
816 // Detect unmarked random access points
817
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 18328 if ( err >= 0
818
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 18317 && h->long_ref_count==0
819
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 17272 && ( h->short_ref_count<=2
820
6/6
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 10060 || pps_ref_count[0] <= 2 && pps_ref_count[1] <= 1 && h->avctx->has_b_frames
821
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 9156 || pps_ref_count[0] <= 1 + (h->picture_structure != PICT_FRAME) && pps_ref_count[1] <= 1)
822
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 8821 && pps_ref_count[0]<=2 + (h->picture_structure != PICT_FRAME) + (2*!h->has_recovery_point)
823
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 7632 && h->cur_pic_ptr->f->pict_type == AV_PICTURE_TYPE_I){
824 2262 h->cur_pic_ptr->recovered |= 1;
825
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 2262 if(!h->avctx->has_b_frames)
826 1533 h->frame_recovered |= FRAME_RECOVERED_SEI;
827 }
828
829 16795 out:
830
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 18328 return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0;
831 }
832
833 24123 int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
834 const H2645NAL *nal, void *logctx)
835 {
836 int i;
837 24123 MMCO *mmco = sl->mmco;
838 24123 int nb_mmco = 0;
839
840
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 24123 if (nal->type == H264_NAL_IDR_SLICE) { // FIXME fields
841 2240 skip_bits1(gb); // broken_link
842
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 2240 if (get_bits1(gb)) {
843 3 mmco[0].opcode = MMCO_LONG;
844 3 mmco[0].long_arg = 0;
845 3 nb_mmco = 1;
846 }
847 2240 sl->explicit_ref_marking = 1;
848 } else {
849 21883 sl->explicit_ref_marking = get_bits1(gb);
850
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 21883 if (sl->explicit_ref_marking) {
851
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 6722 for (i = 0; i < FF_ARRAY_ELEMS(sl->mmco); i++) {
852 6722 MMCOOpcode opcode = get_ue_golomb_31(gb);
853
854 6722 mmco[i].opcode = opcode;
855
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 6722 if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
856 3877 mmco[i].short_pic_num =
857 3877 (sl->curr_pic_num - get_ue_golomb_long(gb) - 1) &
858 3877 (sl->max_pic_num - 1);
859 }
860
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 6722 if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
861
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 6257 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) {
862 875 unsigned int long_arg = get_ue_golomb_31(gb);
863
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 875 if (long_arg >= 32 ||
864 ✗ (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG &&
865 ✗ long_arg == 16) &&
866 ✗ !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(sl)))) {
867 ✗ av_log(logctx, AV_LOG_ERROR,
868 "illegal long ref in memory management control "
869 "operation %d\n", opcode);
870 ✗ sl->nb_mmco = i;
871 ✗ return -1;
872 }
873 875 mmco[i].long_arg = long_arg;
874 }
875
876
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 6722 if (opcode > (unsigned) MMCO_LONG) {
877 ✗ av_log(logctx, AV_LOG_ERROR,
878 "illegal memory management control operation %d\n",
879 opcode);
880 ✗ sl->nb_mmco = i;
881 ✗ return -1;
882 }
883
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 6722 if (opcode == MMCO_END)
884 2320 break;
885 }
886 2320 nb_mmco = i;
887 }
888 }
889
890 24123 sl->nb_mmco = nb_mmco;
891
892 24123 return 0;
893 }
894